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FFmpeg/libavcodec/vc1dec.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2011 Mashiat Sarker Shakkhar

  4.  * Copyright (c) 2006-2007 Konstantin Shishkov

  5.  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer

  6.  *

  7.  * This file is part of FFmpeg.

  8.  *

  9.  * FFmpeg is free software; you can redistribute it and/or

  10.  * modify it under the terms of the GNU Lesser General Public

  11.  * License as published by the Free Software Foundation; either

  12.  * version 2.1 of the License, or (at your option) any later version.

  13.  *

  14.  * FFmpeg is distributed in the hope that it will be useful,

  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  17.  * Lesser General Public License for more details.

  18.  *

  19.  * You should have received a copy of the GNU Lesser General Public

  20.  * License along with FFmpeg; if not, write to the Free Software

  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  22.  */

  23. 

  24. /**

  25.  * @file

  26.  * VC-1 and WMV3 decoder

  27.  */

  28. 

  29. #include "internal.h"

  30. #include "avcodec.h"

  31. #include "error_resilience.h"

  32. #include "mpegvideo.h"

  33. #include "h263.h"

  34. #include "h264chroma.h"

  35. #include "vc1.h"

  36. #include "vc1data.h"

  37. #include "vc1acdata.h"

  38. #include "msmpeg4data.h"

  39. #include "unary.h"

  40. #include "mathops.h"

  41. #include "vdpau_internal.h"

  42. #include "libavutil/avassert.h"

  43. 

  44. #undef NDEBUG

  45. #include <assert.h>

  46. 

  47. #define MB_INTRA_VLC_BITS 9

  48. #define DC_VLC_BITS 9

  49. 

  50. 

  51. // offset tables for interlaced picture MVDATA decoding

  52. static const int offset_table1[9] = {  0,  1,  2,  4,  8, 16, 32,  64, 128 };

  53. static const int offset_table2[9] = {  0,  1,  3,  7, 15, 31, 63, 127, 255 };

  54. 

  55. /***********************************************************************/

  56. /**

  57.  * @name VC-1 Bitplane decoding

  58.  * @see 8.7, p56

  59.  * @{

  60.  */

  61. 

  62. /**

  63.  * Imode types

  64.  * @{

  65.  */

  66. enum Imode {

  67.     IMODE_RAW,

  68.     IMODE_NORM2,

  69.     IMODE_DIFF2,

  70.     IMODE_NORM6,

  71.     IMODE_DIFF6,

  72.     IMODE_ROWSKIP,

  73.     IMODE_COLSKIP

  74. };

  75. /** @} */ //imode defines

  76. 

  77. static void init_block_index(VC1Context *v)

  78. {

  79.     MpegEncContext *s = &v->s;

  80.     ff_init_block_index(s);

  81.     if (v->field_mode && !(v->second_field ^ v->tff)) {

  82.         s->dest[0] += s->current_picture_ptr->f.linesize[0];

  83.         s->dest[1] += s->current_picture_ptr->f.linesize[1];

  84.         s->dest[2] += s->current_picture_ptr->f.linesize[2];

  85.     }

  86. }

  87. 

  88. 

  89. /** @} */ //Bitplane group

  90. 

  91. static void vc1_put_signed_blocks_clamped(VC1Context *v)

  92. {

  93.     MpegEncContext *s = &v->s;

  94.     int topleft_mb_pos, top_mb_pos;

  95.     int stride_y, fieldtx = 0;

  96.     int v_dist;

  97. 

  98.     /* The put pixels loop is always one MB row behind the decoding loop,

  99.      * because we can only put pixels when overlap filtering is done, and

  100.      * for filtering of the bottom edge of a MB, we need the next MB row

  101.      * present as well.

  102.      * Within the row, the put pixels loop is also one MB col behind the

  103.      * decoding loop. The reason for this is again, because for filtering

  104.      * of the right MB edge, we need the next MB present. */

  105.     if (!s->first_slice_line) {

  106.         if (s->mb_x) {

  107.             topleft_mb_pos = (s->mb_y - 1) * s->mb_stride + s->mb_x - 1;

  108.             if (v->fcm == ILACE_FRAME)

  109.                 fieldtx = v->fieldtx_plane[topleft_mb_pos];

  110.             stride_y       = s->linesize << fieldtx;

  111.             v_dist         = (16 - fieldtx) >> (fieldtx == 0);

  112.             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][0],

  113.                                              s->dest[0] - 16 * s->linesize - 16,

  114.                                              stride_y);

  115.             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][1],

  116.                                              s->dest[0] - 16 * s->linesize - 8,

  117.                                              stride_y);

  118.             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][2],

  119.                                              s->dest[0] - v_dist * s->linesize - 16,

  120.                                              stride_y);

  121.             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][3],

  122.                                              s->dest[0] - v_dist * s->linesize - 8,

  123.                                              stride_y);

  124.             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][4],

  125.                                              s->dest[1] - 8 * s->uvlinesize - 8,

  126.                                              s->uvlinesize);

  127.             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][5],

  128.                                              s->dest[2] - 8 * s->uvlinesize - 8,

  129.                                              s->uvlinesize);

  130.         }

  131.         if (s->mb_x == s->mb_width - 1) {

  132.             top_mb_pos = (s->mb_y - 1) * s->mb_stride + s->mb_x;

  133.             if (v->fcm == ILACE_FRAME)

  134.                 fieldtx = v->fieldtx_plane[top_mb_pos];

  135.             stride_y   = s->linesize << fieldtx;

  136.             v_dist     = fieldtx ? 15 : 8;

  137.             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][0],

  138.                                              s->dest[0] - 16 * s->linesize,

  139.                                              stride_y);

  140.             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][1],

  141.                                              s->dest[0] - 16 * s->linesize + 8,

  142.                                              stride_y);

  143.             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][2],

  144.                                              s->dest[0] - v_dist * s->linesize,

  145.                                              stride_y);

  146.             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][3],

  147.                                              s->dest[0] - v_dist * s->linesize + 8,

  148.                                              stride_y);

  149.             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][4],

  150.                                              s->dest[1] - 8 * s->uvlinesize,

  151.                                              s->uvlinesize);

  152.             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][5],

  153.                                              s->dest[2] - 8 * s->uvlinesize,

  154.                                              s->uvlinesize);

  155.         }

  156.     }

  157. 

  158. #define inc_blk_idx(idx) do { \

  159.         idx++; \

  160.         if (idx >= v->n_allocated_blks) \

  161.             idx = 0; \

  162.     } while (0)

  163. 

  164.     inc_blk_idx(v->topleft_blk_idx);

  165.     inc_blk_idx(v->top_blk_idx);

  166.     inc_blk_idx(v->left_blk_idx);

  167.     inc_blk_idx(v->cur_blk_idx);

  168. }

  169. 

  170. static void vc1_loop_filter_iblk(VC1Context *v, int pq)

  171. {

  172.     MpegEncContext *s = &v->s;

  173.     int j;

  174.     if (!s->first_slice_line) {

  175.         v->vc1dsp.vc1_v_loop_filter16(s->dest[0], s->linesize, pq);

  176.         if (s->mb_x)

  177.             v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize, s->linesize, pq);

  178.         v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize + 8, s->linesize, pq);

  179.         for (j = 0; j < 2; j++) {

  180.             v->vc1dsp.vc1_v_loop_filter8(s->dest[j + 1], s->uvlinesize, pq);

  181.             if (s->mb_x)

  182.                 v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize, s->uvlinesize, pq);

  183.         }

  184.     }

  185.     v->vc1dsp.vc1_v_loop_filter16(s->dest[0] + 8 * s->linesize, s->linesize, pq);

  186. 

  187.     if (s->mb_y == s->end_mb_y - 1) {

  188.         if (s->mb_x) {

  189.             v->vc1dsp.vc1_h_loop_filter16(s->dest[0], s->linesize, pq);

  190.             v->vc1dsp.vc1_h_loop_filter8(s->dest[1], s->uvlinesize, pq);

  191.             v->vc1dsp.vc1_h_loop_filter8(s->dest[2], s->uvlinesize, pq);

  192.         }

  193.         v->vc1dsp.vc1_h_loop_filter16(s->dest[0] + 8, s->linesize, pq);

  194.     }

  195. }

  196. 

  197. static void vc1_loop_filter_iblk_delayed(VC1Context *v, int pq)

  198. {

  199.     MpegEncContext *s = &v->s;

  200.     int j;

  201. 

  202.     /* The loopfilter runs 1 row and 1 column behind the overlap filter, which

  203.      * means it runs two rows/cols behind the decoding loop. */

  204.     if (!s->first_slice_line) {

  205.         if (s->mb_x) {

  206.             if (s->mb_y >= s->start_mb_y + 2) {

  207.                 v->vc1dsp.vc1_v_loop_filter16(s->dest[0] - 16 * s->linesize - 16, s->linesize, pq);

  208. 

  209.                 if (s->mb_x >= 2)

  210.                     v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 32 * s->linesize - 16, s->linesize, pq);

  211.                 v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 32 * s->linesize - 8, s->linesize, pq);

  212.                 for (j = 0; j < 2; j++) {

  213.                     v->vc1dsp.vc1_v_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize - 8, s->uvlinesize, pq);

  214.                     if (s->mb_x >= 2) {

  215.                         v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 16 * s->uvlinesize - 8, s->uvlinesize, pq);

  216.                     }

  217.                 }

  218.             }

  219.             v->vc1dsp.vc1_v_loop_filter16(s->dest[0] - 8 * s->linesize - 16, s->linesize, pq);

  220.         }

  221. 

  222.         if (s->mb_x == s->mb_width - 1) {

  223.             if (s->mb_y >= s->start_mb_y + 2) {

  224.                 v->vc1dsp.vc1_v_loop_filter16(s->dest[0] - 16 * s->linesize, s->linesize, pq);

  225. 

  226.                 if (s->mb_x)

  227.                     v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 32 * s->linesize, s->linesize, pq);

  228.                 v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 32 * s->linesize + 8, s->linesize, pq);

  229.                 for (j = 0; j < 2; j++) {

  230.                     v->vc1dsp.vc1_v_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize, s->uvlinesize, pq);

  231.                     if (s->mb_x >= 2) {

  232.                         v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 16 * s->uvlinesize, s->uvlinesize, pq);

  233.                     }

  234.                 }

  235.             }

  236.             v->vc1dsp.vc1_v_loop_filter16(s->dest[0] - 8 * s->linesize, s->linesize, pq);

  237.         }

  238. 

  239.         if (s->mb_y == s->end_mb_y) {

  240.             if (s->mb_x) {

  241.                 if (s->mb_x >= 2)

  242.                     v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize - 16, s->linesize, pq);

  243.                 v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize - 8, s->linesize, pq);

  244.                 if (s->mb_x >= 2) {

  245.                     for (j = 0; j < 2; j++) {

  246.                         v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize - 8, s->uvlinesize, pq);

  247.                     }

  248.                 }

  249.             }

  250. 

  251.             if (s->mb_x == s->mb_width - 1) {

  252.                 if (s->mb_x)

  253.                     v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize, s->linesize, pq);

  254.                 v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize + 8, s->linesize, pq);

  255.                 if (s->mb_x) {

  256.                     for (j = 0; j < 2; j++) {

  257.                         v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize, s->uvlinesize, pq);

  258.                     }

  259.                 }

  260.             }

  261.         }

  262.     }

  263. }

  264. 

  265. static void vc1_smooth_overlap_filter_iblk(VC1Context *v)

  266. {

  267.     MpegEncContext *s = &v->s;

  268.     int mb_pos;

  269. 

  270.     if (v->condover == CONDOVER_NONE)

  271.         return;

  272. 

  273.     mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  274. 

  275.     /* Within a MB, the horizontal overlap always runs before the vertical.

  276.      * To accomplish that, we run the H on left and internal borders of the

  277.      * currently decoded MB. Then, we wait for the next overlap iteration

  278.      * to do H overlap on the right edge of this MB, before moving over and

  279.      * running the V overlap. Therefore, the V overlap makes us trail by one

  280.      * MB col and the H overlap filter makes us trail by one MB row. This

  281.      * is reflected in the time at which we run the put_pixels loop. */

  282.     if (v->condover == CONDOVER_ALL || v->pq >= 9 || v->over_flags_plane[mb_pos]) {

  283.         if (s->mb_x && (v->condover == CONDOVER_ALL || v->pq >= 9 ||

  284.                         v->over_flags_plane[mb_pos - 1])) {

  285.             v->vc1dsp.vc1_h_s_overlap(v->block[v->left_blk_idx][1],

  286.                                       v->block[v->cur_blk_idx][0]);

  287.             v->vc1dsp.vc1_h_s_overlap(v->block[v->left_blk_idx][3],

  288.                                       v->block[v->cur_blk_idx][2]);

  289.             if (!(s->flags & CODEC_FLAG_GRAY)) {

  290.                 v->vc1dsp.vc1_h_s_overlap(v->block[v->left_blk_idx][4],

  291.                                           v->block[v->cur_blk_idx][4]);

  292.                 v->vc1dsp.vc1_h_s_overlap(v->block[v->left_blk_idx][5],

  293.                                           v->block[v->cur_blk_idx][5]);

  294.             }

  295.         }

  296.         v->vc1dsp.vc1_h_s_overlap(v->block[v->cur_blk_idx][0],

  297.                                   v->block[v->cur_blk_idx][1]);

  298.         v->vc1dsp.vc1_h_s_overlap(v->block[v->cur_blk_idx][2],

  299.                                   v->block[v->cur_blk_idx][3]);

  300. 

  301.         if (s->mb_x == s->mb_width - 1) {

  302.             if (!s->first_slice_line && (v->condover == CONDOVER_ALL || v->pq >= 9 ||

  303.                                          v->over_flags_plane[mb_pos - s->mb_stride])) {

  304.                 v->vc1dsp.vc1_v_s_overlap(v->block[v->top_blk_idx][2],

  305.                                           v->block[v->cur_blk_idx][0]);

  306.                 v->vc1dsp.vc1_v_s_overlap(v->block[v->top_blk_idx][3],

  307.                                           v->block[v->cur_blk_idx][1]);

  308.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  309.                     v->vc1dsp.vc1_v_s_overlap(v->block[v->top_blk_idx][4],

  310.                                               v->block[v->cur_blk_idx][4]);

  311.                     v->vc1dsp.vc1_v_s_overlap(v->block[v->top_blk_idx][5],

  312.                                               v->block[v->cur_blk_idx][5]);

  313.                 }

  314.             }

  315.             v->vc1dsp.vc1_v_s_overlap(v->block[v->cur_blk_idx][0],

  316.                                       v->block[v->cur_blk_idx][2]);

  317.             v->vc1dsp.vc1_v_s_overlap(v->block[v->cur_blk_idx][1],

  318.                                       v->block[v->cur_blk_idx][3]);

  319.         }

  320.     }

  321.     if (s->mb_x && (v->condover == CONDOVER_ALL || v->over_flags_plane[mb_pos - 1])) {

  322.         if (!s->first_slice_line && (v->condover == CONDOVER_ALL || v->pq >= 9 ||

  323.                                      v->over_flags_plane[mb_pos - s->mb_stride - 1])) {

  324.             v->vc1dsp.vc1_v_s_overlap(v->block[v->topleft_blk_idx][2],

  325.                                       v->block[v->left_blk_idx][0]);

  326.             v->vc1dsp.vc1_v_s_overlap(v->block[v->topleft_blk_idx][3],

  327.                                       v->block[v->left_blk_idx][1]);

  328.             if (!(s->flags & CODEC_FLAG_GRAY)) {

  329.                 v->vc1dsp.vc1_v_s_overlap(v->block[v->topleft_blk_idx][4],

  330.                                           v->block[v->left_blk_idx][4]);

  331.                 v->vc1dsp.vc1_v_s_overlap(v->block[v->topleft_blk_idx][5],

  332.                                           v->block[v->left_blk_idx][5]);

  333.             }

  334.         }

  335.         v->vc1dsp.vc1_v_s_overlap(v->block[v->left_blk_idx][0],

  336.                                   v->block[v->left_blk_idx][2]);

  337.         v->vc1dsp.vc1_v_s_overlap(v->block[v->left_blk_idx][1],

  338.                                   v->block[v->left_blk_idx][3]);

  339.     }

  340. }

  341. 

  342. /** Do motion compensation over 1 macroblock

  343.  * Mostly adapted hpel_motion and qpel_motion from mpegvideo.c

  344.  */

  345. static void vc1_mc_1mv(VC1Context *v, int dir)

  346. {

  347.     MpegEncContext *s = &v->s;

  348.     H264ChromaContext *h264chroma = &v->h264chroma;

  349.     uint8_t *srcY, *srcU, *srcV;

  350.     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  351.     int off, off_uv;

  352.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  353.     int i;

  354.     const uint8_t *luty, *lutuv;

  355.     int use_ic;

  356. 

  357.     if ((!v->field_mode ||

  358.          (v->ref_field_type[dir] == 1 && v->cur_field_type == 1)) &&

  359.         !v->s.last_picture.f.data[0])

  360.         return;

  361. 

  362.     mx = s->mv[dir][0][0];

  363.     my = s->mv[dir][0][1];

  364. 

  365.     // store motion vectors for further use in B frames

  366.     if (s->pict_type == AV_PICTURE_TYPE_P) {

  367.         for (i = 0; i < 4; i++) {

  368.             s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][0] = mx;

  369.             s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][1] = my;

  370.         }

  371.     }

  372. 

  373.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  374.     uvmy = (my + ((my & 3) == 3)) >> 1;

  375.     v->luma_mv[s->mb_x][0] = uvmx;

  376.     v->luma_mv[s->mb_x][1] = uvmy;

  377. 

  378.     if (v->field_mode &&

  379.         v->cur_field_type != v->ref_field_type[dir]) {

  380.         my   = my   - 2 + 4 * v->cur_field_type;

  381.         uvmy = uvmy - 2 + 4 * v->cur_field_type;

  382.     }

  383. 

  384.     // fastuvmc shall be ignored for interlaced frame picture

  385.     if (v->fastuvmc && (v->fcm != ILACE_FRAME)) {

  386.         uvmx = uvmx + ((uvmx < 0) ? (uvmx & 1) : -(uvmx & 1));

  387.         uvmy = uvmy + ((uvmy < 0) ? (uvmy & 1) : -(uvmy & 1));

  388.     }

  389.     if (!dir) {

  390.         if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {

  391.             srcY = s->current_picture.f.data[0];

  392.             srcU = s->current_picture.f.data[1];

  393.             srcV = s->current_picture.f.data[2];

  394.             luty = v->curr_luty [v->ref_field_type[dir]];

  395.             lutuv= v->curr_lutuv[v->ref_field_type[dir]];

  396.             use_ic=v->curr_use_ic;

  397.         } else {

  398.             srcY = s->last_picture.f.data[0];

  399.             srcU = s->last_picture.f.data[1];

  400.             srcV = s->last_picture.f.data[2];

  401.             luty = v->last_luty [v->ref_field_type[dir]];

  402.             lutuv= v->last_lutuv[v->ref_field_type[dir]];

  403.             use_ic=v->last_use_ic;

  404.         }

  405.     } else {

  406.         srcY = s->next_picture.f.data[0];

  407.         srcU = s->next_picture.f.data[1];

  408.         srcV = s->next_picture.f.data[2];

  409.         luty = v->next_luty [v->ref_field_type[dir]];

  410.         lutuv= v->next_lutuv[v->ref_field_type[dir]];

  411.         use_ic=v->next_use_ic;

  412.     }

  413. 

  414.     if(!srcY)

  415.         return;

  416. 

  417.     src_x   = s->mb_x * 16 + (mx   >> 2);

  418.     src_y   = s->mb_y * 16 + (my   >> 2);

  419.     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);

  420.     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

  421. 

  422.     if (v->profile != PROFILE_ADVANCED) {

  423.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  424.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  425.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  426.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  427.     } else {

  428.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  429.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  430.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  431.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  432.     }

  433. 

  434.     srcY += src_y   * s->linesize   + src_x;

  435.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  436.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  437. 

  438.     if (v->field_mode && v->ref_field_type[dir]) {

  439.         srcY += s->current_picture_ptr->f.linesize[0];

  440.         srcU += s->current_picture_ptr->f.linesize[1];

  441.         srcV += s->current_picture_ptr->f.linesize[2];

  442.     }

  443. 

  444.     /* for grayscale we should not try to read from unknown area */

  445.     if (s->flags & CODEC_FLAG_GRAY) {

  446.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  447.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  448.     }

  449. 

  450.     if (v->rangeredfrm || use_ic

  451.         || s->h_edge_pos < 22 || v_edge_pos < 22

  452.         || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel * 3

  453.         || (unsigned)(src_y - 1)        > v_edge_pos    - (my&3) - 16 - 3) {

  454.         uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

  455. 

  456.         srcY -= s->mspel * (1 + s->linesize);

  457.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize,

  458.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

  459.                                  src_x - s->mspel, src_y - s->mspel,

  460.                                  s->h_edge_pos, v_edge_pos);

  461.         srcY = s->edge_emu_buffer;

  462.         s->vdsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8 + 1, 8 + 1,

  463.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  464.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8 + 1, 8 + 1,

  465.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  466.         srcU = uvbuf;

  467.         srcV = uvbuf + 16;

  468.         /* if we deal with range reduction we need to scale source blocks */

  469.         if (v->rangeredfrm) {

  470.             int i, j;

  471.             uint8_t *src, *src2;

  472. 

  473.             src = srcY;

  474.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  475.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  476.                     src[i] = ((src[i] - 128) >> 1) + 128;

  477.                 src += s->linesize;

  478.             }

  479.             src  = srcU;

  480.             src2 = srcV;

  481.             for (j = 0; j < 9; j++) {

  482.                 for (i = 0; i < 9; i++) {

  483.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  484.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  485.                 }

  486.                 src  += s->uvlinesize;

  487.                 src2 += s->uvlinesize;

  488.             }

  489.         }

  490.         /* if we deal with intensity compensation we need to scale source blocks */

  491.         if (use_ic) {

  492.             int i, j;

  493.             uint8_t *src, *src2;

  494. 

  495.             src = srcY;

  496.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  497.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  498.                     src[i] = luty[src[i]];

  499.                 src += s->linesize;

  500.             }

  501.             src  = srcU;

  502.             src2 = srcV;

  503.             for (j = 0; j < 9; j++) {

  504.                 for (i = 0; i < 9; i++) {

  505.                     src[i]  = lutuv[src[i]];

  506.                     src2[i] = lutuv[src2[i]];

  507.                 }

  508.                 src  += s->uvlinesize;

  509.                 src2 += s->uvlinesize;

  510.             }

  511.         }

  512.         srcY += s->mspel * (1 + s->linesize);

  513.     }

  514. 

  515.         off    = 0;

  516.         off_uv = 0;

  517.     if (s->mspel) {

  518.         dxy = ((my & 3) << 2) | (mx & 3);

  519.         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);

  520.         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);

  521.         srcY += s->linesize * 8;

  522.         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  523.         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  524.     } else { // hpel mc - always used for luma

  525.         dxy = (my & 2) | ((mx & 2) >> 1);

  526.         if (!v->rnd)

  527.             s->hdsp.put_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  528.         else

  529.             s->hdsp.put_no_rnd_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  530.     }

  531. 

  532.     if (s->flags & CODEC_FLAG_GRAY) return;

  533.     /* Chroma MC always uses qpel bilinear */

  534.     uvmx = (uvmx & 3) << 1;

  535.     uvmy = (uvmy & 3) << 1;

  536.     if (!v->rnd) {

  537.         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  538.         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  539.     } else {

  540.         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  541.         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  542.     }

  543. }

  544. 

  545. static inline int median4(int a, int b, int c, int d)

  546. {

  547.     if (a < b) {

  548.         if (c < d) return (FFMIN(b, d) + FFMAX(a, c)) / 2;

  549.         else       return (FFMIN(b, c) + FFMAX(a, d)) / 2;

  550.     } else {

  551.         if (c < d) return (FFMIN(a, d) + FFMAX(b, c)) / 2;

  552.         else       return (FFMIN(a, c) + FFMAX(b, d)) / 2;

  553.     }

  554. }

  555. 

  556. /** Do motion compensation for 4-MV macroblock - luminance block

  557.  */

  558. static void vc1_mc_4mv_luma(VC1Context *v, int n, int dir, int avg)

  559. {

  560.     MpegEncContext *s = &v->s;

  561.     uint8_t *srcY;

  562.     int dxy, mx, my, src_x, src_y;

  563.     int off;

  564.     int fieldmv = (v->fcm == ILACE_FRAME) ? v->blk_mv_type[s->block_index[n]] : 0;

  565.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  566.     const uint8_t *luty;

  567.     int use_ic;

  568. 

  569.     if ((!v->field_mode ||

  570.          (v->ref_field_type[dir] == 1 && v->cur_field_type == 1)) &&

  571.         !v->s.last_picture.f.data[0])

  572.         return;

  573. 

  574.     mx = s->mv[dir][n][0];

  575.     my = s->mv[dir][n][1];

  576. 

  577.     if (!dir) {

  578.         if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {

  579.             srcY = s->current_picture.f.data[0];

  580.             luty = v->curr_luty[v->ref_field_type[dir]];

  581.             use_ic=v->curr_use_ic;

  582.         } else {

  583.             srcY = s->last_picture.f.data[0];

  584.             luty = v->last_luty[v->ref_field_type[dir]];

  585.             use_ic=v->last_use_ic;

  586.         }

  587.     } else {

  588.         srcY = s->next_picture.f.data[0];

  589.         luty = v->next_luty[v->ref_field_type[dir]];

  590.         use_ic=v->next_use_ic;

  591.     }

  592. 

  593.     if(!srcY)

  594.         return;

  595. 

  596.     if (v->field_mode) {

  597.         if (v->cur_field_type != v->ref_field_type[dir])

  598.             my = my - 2 + 4 * v->cur_field_type;

  599.     }

  600. 

  601.     if (s->pict_type == AV_PICTURE_TYPE_P && n == 3 && v->field_mode) {

  602.         int same_count = 0, opp_count = 0, k;

  603.         int chosen_mv[2][4][2], f;

  604.         int tx, ty;

  605.         for (k = 0; k < 4; k++) {

  606.             f = v->mv_f[0][s->block_index[k] + v->blocks_off];

  607.             chosen_mv[f][f ? opp_count : same_count][0] = s->mv[0][k][0];

  608.             chosen_mv[f][f ? opp_count : same_count][1] = s->mv[0][k][1];

  609.             opp_count  += f;

  610.             same_count += 1 - f;

  611.         }

  612.         f = opp_count > same_count;

  613.         switch (f ? opp_count : same_count) {

  614.         case 4:

  615.             tx = median4(chosen_mv[f][0][0], chosen_mv[f][1][0],

  616.                          chosen_mv[f][2][0], chosen_mv[f][3][0]);

  617.             ty = median4(chosen_mv[f][0][1], chosen_mv[f][1][1],

  618.                          chosen_mv[f][2][1], chosen_mv[f][3][1]);

  619.             break;

  620.         case 3:

  621.             tx = mid_pred(chosen_mv[f][0][0], chosen_mv[f][1][0], chosen_mv[f][2][0]);

  622.             ty = mid_pred(chosen_mv[f][0][1], chosen_mv[f][1][1], chosen_mv[f][2][1]);

  623.             break;

  624.         case 2:

  625.             tx = (chosen_mv[f][0][0] + chosen_mv[f][1][0]) / 2;

  626.             ty = (chosen_mv[f][0][1] + chosen_mv[f][1][1]) / 2;

  627.             break;

  628.         default:

  629.             av_assert2(0);

  630.         }

  631.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;

  632.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;

  633.         for (k = 0; k < 4; k++)

  634.             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;

  635.     }

  636. 

  637.     if (v->fcm == ILACE_FRAME) {  // not sure if needed for other types of picture

  638.         int qx, qy;

  639.         int width  = s->avctx->coded_width;

  640.         int height = s->avctx->coded_height >> 1;

  641.         if (s->pict_type == AV_PICTURE_TYPE_P) {

  642.             s->current_picture.motion_val[1][s->block_index[n] + v->blocks_off][0] = mx;

  643.             s->current_picture.motion_val[1][s->block_index[n] + v->blocks_off][1] = my;

  644.         }

  645.         qx = (s->mb_x * 16) + (mx >> 2);

  646.         qy = (s->mb_y *  8) + (my >> 3);

  647. 

  648.         if (qx < -17)

  649.             mx -= 4 * (qx + 17);

  650.         else if (qx > width)

  651.             mx -= 4 * (qx - width);

  652.         if (qy < -18)

  653.             my -= 8 * (qy + 18);

  654.         else if (qy > height + 1)

  655.             my -= 8 * (qy - height - 1);

  656.     }

  657. 

  658.     if ((v->fcm == ILACE_FRAME) && fieldmv)

  659.         off = ((n > 1) ? s->linesize : 0) + (n & 1) * 8;

  660.     else

  661.         off = s->linesize * 4 * (n & 2) + (n & 1) * 8;

  662. 

  663.     src_x = s->mb_x * 16 + (n & 1) * 8 + (mx >> 2);

  664.     if (!fieldmv)

  665.         src_y = s->mb_y * 16 + (n & 2) * 4 + (my >> 2);

  666.     else

  667.         src_y = s->mb_y * 16 + ((n > 1) ? 1 : 0) + (my >> 2);

  668. 

  669.     if (v->profile != PROFILE_ADVANCED) {

  670.         src_x = av_clip(src_x, -16, s->mb_width  * 16);

  671.         src_y = av_clip(src_y, -16, s->mb_height * 16);

  672.     } else {

  673.         src_x = av_clip(src_x, -17, s->avctx->coded_width);

  674.         if (v->fcm == ILACE_FRAME) {

  675.             if (src_y & 1)

  676.                 src_y = av_clip(src_y, -17, s->avctx->coded_height + 1);

  677.             else

  678.                 src_y = av_clip(src_y, -18, s->avctx->coded_height);

  679.         } else {

  680.             src_y = av_clip(src_y, -18, s->avctx->coded_height + 1);

  681.         }

  682.     }

  683. 

  684.     srcY += src_y * s->linesize + src_x;

  685.     if (v->field_mode && v->ref_field_type[dir])

  686.         srcY += s->current_picture_ptr->f.linesize[0];

  687. 

  688.     if (fieldmv && !(src_y & 1))

  689.         v_edge_pos--;

  690.     if (fieldmv && (src_y & 1) && src_y < 4)

  691.         src_y--;

  692.     if (v->rangeredfrm || use_ic

  693.         || s->h_edge_pos < 13 || v_edge_pos < 23

  694.         || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx & 3) - 8 - s->mspel * 2

  695.         || (unsigned)(src_y - (s->mspel << fieldmv)) > v_edge_pos - (my & 3) - ((8 + s->mspel * 2) << fieldmv)) {

  696.         srcY -= s->mspel * (1 + (s->linesize << fieldmv));

  697.         /* check emulate edge stride and offset */

  698.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize,

  699.                                  9 + s->mspel * 2, (9 + s->mspel * 2) << fieldmv,

  700.                                  src_x - s->mspel, src_y - (s->mspel << fieldmv),

  701.                                  s->h_edge_pos, v_edge_pos);

  702.         srcY = s->edge_emu_buffer;

  703.         /* if we deal with range reduction we need to scale source blocks */

  704.         if (v->rangeredfrm) {

  705.             int i, j;

  706.             uint8_t *src;

  707. 

  708.             src = srcY;

  709.             for (j = 0; j < 9 + s->mspel * 2; j++) {

  710.                 for (i = 0; i < 9 + s->mspel * 2; i++)

  711.                     src[i] = ((src[i] - 128) >> 1) + 128;

  712.                 src += s->linesize << fieldmv;

  713.             }

  714.         }

  715.         /* if we deal with intensity compensation we need to scale source blocks */

  716.         if (use_ic) {

  717.             int i, j;

  718.             uint8_t *src;

  719. 

  720.             src = srcY;

  721.             for (j = 0; j < 9 + s->mspel * 2; j++) {

  722.                 for (i = 0; i < 9 + s->mspel * 2; i++)

  723.                     src[i] = luty[src[i]];

  724.                 src += s->linesize << fieldmv;

  725.             }

  726.         }

  727.         srcY += s->mspel * (1 + (s->linesize << fieldmv));

  728.     }

  729. 

  730.     if (s->mspel) {

  731.         dxy = ((my & 3) << 2) | (mx & 3);

  732.         if (avg)

  733.             v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);

  734.         else

  735.             v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);

  736.     } else { // hpel mc - always used for luma

  737.         dxy = (my & 2) | ((mx & 2) >> 1);

  738.         if (!v->rnd)

  739.             s->hdsp.put_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  740.         else

  741.             s->hdsp.put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  742.     }

  743. }

  744. 

  745. static av_always_inline int get_chroma_mv(int *mvx, int *mvy, int *a, int flag, int *tx, int *ty)

  746. {

  747.     int idx, i;

  748.     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

  749. 

  750.     idx =  ((a[3] != flag) << 3)

  751.          | ((a[2] != flag) << 2)

  752.          | ((a[1] != flag) << 1)

  753.          |  (a[0] != flag);

  754.     if (!idx) {

  755.         *tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  756.         *ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  757.         return 4;

  758.     } else if (count[idx] == 1) {

  759.         switch (idx) {

  760.         case 0x1:

  761.             *tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  762.             *ty = mid_pred(mvy[1], mvy[2], mvy[3]);

  763.             return 3;

  764.         case 0x2:

  765.             *tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  766.             *ty = mid_pred(mvy[0], mvy[2], mvy[3]);

  767.             return 3;

  768.         case 0x4:

  769.             *tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  770.             *ty = mid_pred(mvy[0], mvy[1], mvy[3]);

  771.             return 3;

  772.         case 0x8:

  773.             *tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  774.             *ty = mid_pred(mvy[0], mvy[1], mvy[2]);

  775.             return 3;

  776.         }

  777.     } else if (count[idx] == 2) {

  778.         int t1 = 0, t2 = 0;

  779.         for (i = 0; i < 3; i++)

  780.             if (!a[i]) {

  781.                 t1 = i;

  782.                 break;

  783.             }

  784.         for (i = t1 + 1; i < 4; i++)

  785.             if (!a[i]) {

  786.                 t2 = i;

  787.                 break;

  788.             }

  789.         *tx = (mvx[t1] + mvx[t2]) / 2;

  790.         *ty = (mvy[t1] + mvy[t2]) / 2;

  791.         return 2;

  792.     } else {

  793.         return 0;

  794.     }

  795.     return -1;

  796. }

  797. 

  798. /** Do motion compensation for 4-MV macroblock - both chroma blocks

  799.  */

  800. static void vc1_mc_4mv_chroma(VC1Context *v, int dir)

  801. {

  802.     MpegEncContext *s = &v->s;

  803.     H264ChromaContext *h264chroma = &v->h264chroma;

  804.     uint8_t *srcU, *srcV;

  805.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

  806.     int k, tx = 0, ty = 0;

  807.     int mvx[4], mvy[4], intra[4], mv_f[4];

  808.     int valid_count;

  809.     int chroma_ref_type = v->cur_field_type, off = 0;

  810.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  811.     const uint8_t *lutuv;

  812.     int use_ic;

  813. 

  814.     if (!v->field_mode && !v->s.last_picture.f.data[0])

  815.         return;

  816.     if (s->flags & CODEC_FLAG_GRAY)

  817.         return;

  818. 

  819.     for (k = 0; k < 4; k++) {

  820.         mvx[k] = s->mv[dir][k][0];

  821.         mvy[k] = s->mv[dir][k][1];

  822.         intra[k] = v->mb_type[0][s->block_index[k]];

  823.         if (v->field_mode)

  824.             mv_f[k] = v->mv_f[dir][s->block_index[k] + v->blocks_off];

  825.     }

  826. 

  827.     /* calculate chroma MV vector from four luma MVs */

  828.     if (!v->field_mode || (v->field_mode && !v->numref)) {

  829.         valid_count = get_chroma_mv(mvx, mvy, intra, 0, &tx, &ty);

  830.         chroma_ref_type = v->reffield;

  831.         if (!valid_count) {

  832.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  833.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  834.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  835.             return; //no need to do MC for intra blocks

  836.         }

  837.     } else {

  838.         int dominant = 0;

  839.         if (mv_f[0] + mv_f[1] + mv_f[2] + mv_f[3] > 2)

  840.             dominant = 1;

  841.         valid_count = get_chroma_mv(mvx, mvy, mv_f, dominant, &tx, &ty);

  842.         if (dominant)

  843.             chroma_ref_type = !v->cur_field_type;

  844.     }

  845.     if (v->field_mode && chroma_ref_type == 1 && v->cur_field_type == 1 && !v->s.last_picture.f.data[0])

  846.         return;

  847.     s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;

  848.     s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;

  849.     uvmx = (tx + ((tx & 3) == 3)) >> 1;

  850.     uvmy = (ty + ((ty & 3) == 3)) >> 1;

  851. 

  852.     v->luma_mv[s->mb_x][0] = uvmx;

  853.     v->luma_mv[s->mb_x][1] = uvmy;

  854. 

  855.     if (v->fastuvmc) {

  856.         uvmx = uvmx + ((uvmx < 0) ? (uvmx & 1) : -(uvmx & 1));

  857.         uvmy = uvmy + ((uvmy < 0) ? (uvmy & 1) : -(uvmy & 1));

  858.     }

  859.     // Field conversion bias

  860.     if (v->cur_field_type != chroma_ref_type)

  861.         uvmy += 2 - 4 * chroma_ref_type;

  862. 

  863.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  864.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  865. 

  866.     if (v->profile != PROFILE_ADVANCED) {

  867.         uvsrc_x = av_clip(uvsrc_x, -8, s->mb_width  * 8);

  868.         uvsrc_y = av_clip(uvsrc_y, -8, s->mb_height * 8);

  869.     } else {

  870.         uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);

  871.         uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);

  872.     }

  873. 

  874.     if (!dir) {

  875.         if (v->field_mode && (v->cur_field_type != chroma_ref_type) && v->second_field) {

  876.             srcU = s->current_picture.f.data[1];

  877.             srcV = s->current_picture.f.data[2];

  878.             lutuv= v->curr_lutuv[chroma_ref_type];

  879.             use_ic=v->curr_use_ic;

  880.         } else {

  881.             srcU = s->last_picture.f.data[1];

  882.             srcV = s->last_picture.f.data[2];

  883.             lutuv= v->last_lutuv[chroma_ref_type];

  884.             use_ic=v->last_use_ic;

  885.         }

  886.     } else {

  887.         srcU = s->next_picture.f.data[1];

  888.         srcV = s->next_picture.f.data[2];

  889.         lutuv= v->next_lutuv[chroma_ref_type];

  890.         use_ic=v->next_use_ic;

  891.     }

  892. 

  893.     if(!srcU)

  894.         return;

  895. 

  896.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  897.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  898. 

  899.     if (v->field_mode) {

  900.         if (chroma_ref_type) {

  901.             srcU += s->current_picture_ptr->f.linesize[1];

  902.             srcV += s->current_picture_ptr->f.linesize[2];

  903.         }

  904.         off = 0;

  905.     }

  906. 

  907.     if (v->rangeredfrm || use_ic

  908.         || s->h_edge_pos < 18 || v_edge_pos < 18

  909.         || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9

  910.         || (unsigned)uvsrc_y > (v_edge_pos    >> 1) - 9) {

  911.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize,

  912.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

  913.                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

  914.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize,

  915.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

  916.                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

  917.         srcU = s->edge_emu_buffer;

  918.         srcV = s->edge_emu_buffer + 16;

  919. 

  920.         /* if we deal with range reduction we need to scale source blocks */

  921.         if (v->rangeredfrm) {

  922.             int i, j;

  923.             uint8_t *src, *src2;

  924. 

  925.             src  = srcU;

  926.             src2 = srcV;

  927.             for (j = 0; j < 9; j++) {

  928.                 for (i = 0; i < 9; i++) {

  929.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  930.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  931.                 }

  932.                 src  += s->uvlinesize;

  933.                 src2 += s->uvlinesize;

  934.             }

  935.         }

  936.         /* if we deal with intensity compensation we need to scale source blocks */

  937.         if (use_ic) {

  938.             int i, j;

  939.             uint8_t *src, *src2;

  940. 

  941.             src  = srcU;

  942.             src2 = srcV;

  943.             for (j = 0; j < 9; j++) {

  944.                 for (i = 0; i < 9; i++) {

  945.                     src[i]  = lutuv[src[i]];

  946.                     src2[i] = lutuv[src2[i]];

  947.                 }

  948.                 src  += s->uvlinesize;

  949.                 src2 += s->uvlinesize;

  950.             }

  951.         }

  952.     }

  953. 

  954.     /* Chroma MC always uses qpel bilinear */

  955.     uvmx = (uvmx & 3) << 1;

  956.     uvmy = (uvmy & 3) << 1;

  957.     if (!v->rnd) {

  958.         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1] + off, srcU, s->uvlinesize, 8, uvmx, uvmy);

  959.         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2] + off, srcV, s->uvlinesize, 8, uvmx, uvmy);

  960.     } else {

  961.         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off, srcU, s->uvlinesize, 8, uvmx, uvmy);

  962.         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off, srcV, s->uvlinesize, 8, uvmx, uvmy);

  963.     }

  964. }

  965. 

  966. /** Do motion compensation for 4-MV field chroma macroblock (both U and V)

  967.  */

  968. static void vc1_mc_4mv_chroma4(VC1Context *v)

  969. {

  970.     MpegEncContext *s = &v->s;

  971.     H264ChromaContext *h264chroma = &v->h264chroma;

  972.     uint8_t *srcU, *srcV;

  973.     int uvsrc_x, uvsrc_y;

  974.     int uvmx_field[4], uvmy_field[4];

  975.     int i, off, tx, ty;

  976.     int fieldmv = v->blk_mv_type[s->block_index[0]];

  977.     static const int s_rndtblfield[16] = { 0, 0, 1, 2, 4, 4, 5, 6, 2, 2, 3, 8, 6, 6, 7, 12 };

  978.     int v_dist = fieldmv ? 1 : 4; // vertical offset for lower sub-blocks

  979.     int v_edge_pos = s->v_edge_pos >> 1;

  980.     int use_ic = v->last_use_ic;

  981. 

  982.     if (!v->s.last_picture.f.data[0])

  983.         return;

  984.     if (s->flags & CODEC_FLAG_GRAY)

  985.         return;

  986. 

  987.     for (i = 0; i < 4; i++) {

  988.         tx = s->mv[0][i][0];

  989.         uvmx_field[i] = (tx + ((tx & 3) == 3)) >> 1;

  990.         ty = s->mv[0][i][1];

  991.         if (fieldmv)

  992.             uvmy_field[i] = (ty >> 4) * 8 + s_rndtblfield[ty & 0xF];

  993.         else

  994.             uvmy_field[i] = (ty + ((ty & 3) == 3)) >> 1;

  995.     }

  996. 

  997.     for (i = 0; i < 4; i++) {

  998.         off = (i & 1) * 4 + ((i & 2) ? v_dist * s->uvlinesize : 0);

  999.         uvsrc_x = s->mb_x * 8 +  (i & 1) * 4           + (uvmx_field[i] >> 2);

  1000.         uvsrc_y = s->mb_y * 8 + ((i & 2) ? v_dist : 0) + (uvmy_field[i] >> 2);

  1001.         // FIXME: implement proper pull-back (see vc1cropmv.c, vc1CROPMV_ChromaPullBack())

  1002.         uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);

  1003.         uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);

  1004.         srcU = s->last_picture.f.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1005.         srcV = s->last_picture.f.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1006.         uvmx_field[i] = (uvmx_field[i] & 3) << 1;

  1007.         uvmy_field[i] = (uvmy_field[i] & 3) << 1;

  1008. 

  1009.         if (fieldmv && !(uvsrc_y & 1))

  1010.             v_edge_pos = (s->v_edge_pos >> 1) - 1;

  1011. 

  1012.         if (fieldmv && (uvsrc_y & 1) && uvsrc_y < 2)

  1013.             uvsrc_y--;

  1014.         if ((use_ic)

  1015.             || s->h_edge_pos < 10 || v_edge_pos < (5 << fieldmv)

  1016.             || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 5

  1017.             || (unsigned)uvsrc_y > v_edge_pos - (5 << fieldmv)) {

  1018.             s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU, s->uvlinesize,

  1019.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

  1020.                                      s->h_edge_pos >> 1, v_edge_pos);

  1021.             s->vdsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize,

  1022.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

  1023.                                      s->h_edge_pos >> 1, v_edge_pos);

  1024.             srcU = s->edge_emu_buffer;

  1025.             srcV = s->edge_emu_buffer + 16;

  1026. 

  1027.             /* if we deal with intensity compensation we need to scale source blocks */

  1028.             if (use_ic) {

  1029.                 int i, j;

  1030.                 uint8_t *src, *src2;

  1031.                 const uint8_t *lutuv = v->last_lutuv[v->ref_field_type[0]];

  1032. 

  1033.                 src  = srcU;

  1034.                 src2 = srcV;

  1035.                 for (j = 0; j < 5; j++) {

  1036.                     for (i = 0; i < 5; i++) {

  1037.                         src[i]  = lutuv[src[i]];

  1038.                         src2[i] = lutuv[src2[i]];

  1039.                     }

  1040.                     src  += s->uvlinesize << 1;

  1041.                     src2 += s->uvlinesize << 1;

  1042.                 }

  1043.             }

  1044.         }

  1045.         if (!v->rnd) {

  1046.             h264chroma->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1047.             h264chroma->put_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1048.         } else {

  1049.             v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1050.             v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1051.         }

  1052.     }

  1053. }

  1054. 

  1055. /***********************************************************************/

  1056. /**

  1057.  * @name VC-1 Block-level functions

  1058.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1059.  * @{

  1060.  */

  1061. 

  1062. /**

  1063.  * @def GET_MQUANT

  1064.  * @brief Get macroblock-level quantizer scale

  1065.  */

  1066. #define GET_MQUANT()                                           \

  1067.     if (v->dquantfrm) {                                        \

  1068.         int edges = 0;                                         \

  1069.         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \

  1070.             if (v->dqbilevel) {                                \

  1071.                 mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \

  1072.             } else {                                           \

  1073.                 mqdiff = get_bits(gb, 3);                      \

  1074.                 if (mqdiff != 7)                               \

  1075.                     mquant = v->pq + mqdiff;                   \

  1076.                 else                                           \

  1077.                     mquant = get_bits(gb, 5);                  \

  1078.             }                                                  \

  1079.         }                                                      \

  1080.         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \

  1081.             edges = 1 << v->dqsbedge;                          \

  1082.         else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \

  1083.             edges = (3 << v->dqsbedge) % 15;                   \

  1084.         else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \

  1085.             edges = 15;                                        \

  1086.         if ((edges&1) && !s->mb_x)                             \

  1087.             mquant = v->altpq;                                 \

  1088.         if ((edges&2) && s->first_slice_line)                  \

  1089.             mquant = v->altpq;                                 \

  1090.         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \

  1091.             mquant = v->altpq;                                 \

  1092.         if ((edges&8) && s->mb_y == (s->mb_height - 1))        \

  1093.             mquant = v->altpq;                                 \

  1094.         if (!mquant || mquant > 31) {                          \

  1095.             av_log(v->s.avctx, AV_LOG_ERROR,                   \

  1096.                    "Overriding invalid mquant %d\n", mquant);  \

  1097.             mquant = 1;                                        \

  1098.         }                                                      \

  1099.     }

  1100. 

  1101. /**

  1102.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1103.  * @brief Get MV differentials

  1104.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1105.  * @param _dmv_x Horizontal differential for decoded MV

  1106.  * @param _dmv_y Vertical differential for decoded MV

  1107.  */

  1108. #define GET_MVDATA(_dmv_x, _dmv_y)                                      \

  1109.     index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \

  1110.                          VC1_MV_DIFF_VLC_BITS, 2);                      \

  1111.     if (index > 36) {                                                   \

  1112.         mb_has_coeffs = 1;                                              \

  1113.         index -= 37;                                                    \

  1114.     } else                                                              \

  1115.         mb_has_coeffs = 0;                                              \

  1116.     s->mb_intra = 0;                                                    \

  1117.     if (!index) {                                                       \

  1118.         _dmv_x = _dmv_y = 0;                                            \

  1119.     } else if (index == 35) {                                           \

  1120.         _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1121.         _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1122.     } else if (index == 36) {                                           \

  1123.         _dmv_x = 0;                                                     \

  1124.         _dmv_y = 0;                                                     \

  1125.         s->mb_intra = 1;                                                \

  1126.     } else {                                                            \

  1127.         index1 = index % 6;                                             \

  1128.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1129.         else                                   val = 0;                 \

  1130.         if (size_table[index1] - val > 0)                               \

  1131.             val = get_bits(gb, size_table[index1] - val);               \

  1132.         else                                   val = 0;                 \

  1133.         sign = 0 - (val&1);                                             \

  1134.         _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1135.                                                                         \

  1136.         index1 = index / 6;                                             \

  1137.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1138.         else                                   val = 0;                 \

  1139.         if (size_table[index1] - val > 0)                               \

  1140.             val = get_bits(gb, size_table[index1] - val);               \

  1141.         else                                   val = 0;                 \

  1142.         sign = 0 - (val & 1);                                           \

  1143.         _dmv_y = (sign ^ ((val >> 1) + offset_table[index1])) - sign;   \

  1144.     }

  1145. 

  1146. static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,

  1147.                                                    int *dmv_y, int *pred_flag)

  1148. {

  1149.     int index, index1;

  1150.     int extend_x = 0, extend_y = 0;

  1151.     GetBitContext *gb = &v->s.gb;

  1152.     int bits, esc;

  1153.     int val, sign;

  1154.     const int* offs_tab;

  1155. 

  1156.     if (v->numref) {

  1157.         bits = VC1_2REF_MVDATA_VLC_BITS;

  1158.         esc  = 125;

  1159.     } else {

  1160.         bits = VC1_1REF_MVDATA_VLC_BITS;

  1161.         esc  = 71;

  1162.     }

  1163.     switch (v->dmvrange) {

  1164.     case 1:

  1165.         extend_x = 1;

  1166.         break;

  1167.     case 2:

  1168.         extend_y = 1;

  1169.         break;

  1170.     case 3:

  1171.         extend_x = extend_y = 1;

  1172.         break;

  1173.     }

  1174.     index = get_vlc2(gb, v->imv_vlc->table, bits, 3);

  1175.     if (index == esc) {

  1176.         *dmv_x = get_bits(gb, v->k_x);

  1177.         *dmv_y = get_bits(gb, v->k_y);

  1178.         if (v->numref) {

  1179.             if (pred_flag) {

  1180.                 *pred_flag = *dmv_y & 1;

  1181.                 *dmv_y     = (*dmv_y + *pred_flag) >> 1;

  1182.             } else {

  1183.                 *dmv_y     = (*dmv_y + (*dmv_y & 1)) >> 1;

  1184.             }

  1185.         }

  1186.     }

  1187.     else {

  1188.         av_assert0(index < esc);

  1189.         if (extend_x)

  1190.             offs_tab = offset_table2;

  1191.         else

  1192.             offs_tab = offset_table1;

  1193.         index1 = (index + 1) % 9;

  1194.         if (index1 != 0) {

  1195.             val    = get_bits(gb, index1 + extend_x);

  1196.             sign   = 0 -(val & 1);

  1197.             *dmv_x = (sign ^ ((val >> 1) + offs_tab[index1])) - sign;

  1198.         } else

  1199.             *dmv_x = 0;

  1200.         if (extend_y)

  1201.             offs_tab = offset_table2;

  1202.         else

  1203.             offs_tab = offset_table1;

  1204.         index1 = (index + 1) / 9;

  1205.         if (index1 > v->numref) {

  1206.             val    = get_bits(gb, (index1 + (extend_y << v->numref)) >> v->numref);

  1207.             sign   = 0 - (val & 1);

  1208.             *dmv_y = (sign ^ ((val >> 1) + offs_tab[index1 >> v->numref])) - sign;

  1209.         } else

  1210.             *dmv_y = 0;

  1211.         if (v->numref && pred_flag)

  1212.             *pred_flag = index1 & 1;

  1213.     }

  1214. }

  1215. 

  1216. static av_always_inline int scaleforsame_x(VC1Context *v, int n /* MV */, int dir)

  1217. {

  1218.     int scaledvalue, refdist;

  1219.     int scalesame1, scalesame2;

  1220.     int scalezone1_x, zone1offset_x;

  1221.     int table_index = dir ^ v->second_field;

  1222. 

  1223.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1224.         refdist = v->refdist;

  1225.     else

  1226.         refdist = dir ? v->brfd : v->frfd;

  1227.     if (refdist > 3)

  1228.         refdist = 3;

  1229.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1230.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1231.     scalezone1_x  = ff_vc1_field_mvpred_scales[table_index][3][refdist];

  1232.     zone1offset_x = ff_vc1_field_mvpred_scales[table_index][5][refdist];

  1233. 

  1234.     if (FFABS(n) > 255)

  1235.         scaledvalue = n;

  1236.     else {

  1237.         if (FFABS(n) < scalezone1_x)

  1238.             scaledvalue = (n * scalesame1) >> 8;

  1239.         else {

  1240.             if (n < 0)

  1241.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_x;

  1242.             else

  1243.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_x;

  1244.         }

  1245.     }

  1246.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1247. }

  1248. 

  1249. static av_always_inline int scaleforsame_y(VC1Context *v, int i, int n /* MV */, int dir)

  1250. {

  1251.     int scaledvalue, refdist;

  1252.     int scalesame1, scalesame2;

  1253.     int scalezone1_y, zone1offset_y;

  1254.     int table_index = dir ^ v->second_field;

  1255. 

  1256.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1257.         refdist = v->refdist;

  1258.     else

  1259.         refdist = dir ? v->brfd : v->frfd;

  1260.     if (refdist > 3)

  1261.         refdist = 3;

  1262.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1263.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1264.     scalezone1_y  = ff_vc1_field_mvpred_scales[table_index][4][refdist];

  1265.     zone1offset_y = ff_vc1_field_mvpred_scales[table_index][6][refdist];

  1266. 

  1267.     if (FFABS(n) > 63)

  1268.         scaledvalue = n;

  1269.     else {

  1270.         if (FFABS(n) < scalezone1_y)

  1271.             scaledvalue = (n * scalesame1) >> 8;

  1272.         else {

  1273.             if (n < 0)

  1274.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_y;

  1275.             else

  1276.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_y;

  1277.         }

  1278.     }

  1279. 

  1280.     if (v->cur_field_type && !v->ref_field_type[dir])

  1281.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1282.     else

  1283.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1284. }

  1285. 

  1286. static av_always_inline int scaleforopp_x(VC1Context *v, int n /* MV */)

  1287. {

  1288.     int scalezone1_x, zone1offset_x;

  1289.     int scaleopp1, scaleopp2, brfd;

  1290.     int scaledvalue;

  1291. 

  1292.     brfd = FFMIN(v->brfd, 3);

  1293.     scalezone1_x  = ff_vc1_b_field_mvpred_scales[3][brfd];

  1294.     zone1offset_x = ff_vc1_b_field_mvpred_scales[5][brfd];

  1295.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1296.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1297. 

  1298.     if (FFABS(n) > 255)

  1299.         scaledvalue = n;

  1300.     else {

  1301.         if (FFABS(n) < scalezone1_x)

  1302.             scaledvalue = (n * scaleopp1) >> 8;

  1303.         else {

  1304.             if (n < 0)

  1305.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_x;

  1306.             else

  1307.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_x;

  1308.         }

  1309.     }

  1310.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1311. }

  1312. 

  1313. static av_always_inline int scaleforopp_y(VC1Context *v, int n /* MV */, int dir)

  1314. {

  1315.     int scalezone1_y, zone1offset_y;

  1316.     int scaleopp1, scaleopp2, brfd;

  1317.     int scaledvalue;

  1318. 

  1319.     brfd = FFMIN(v->brfd, 3);

  1320.     scalezone1_y  = ff_vc1_b_field_mvpred_scales[4][brfd];

  1321.     zone1offset_y = ff_vc1_b_field_mvpred_scales[6][brfd];

  1322.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1323.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1324. 

  1325.     if (FFABS(n) > 63)

  1326.         scaledvalue = n;

  1327.     else {

  1328.         if (FFABS(n) < scalezone1_y)

  1329.             scaledvalue = (n * scaleopp1) >> 8;

  1330.         else {

  1331.             if (n < 0)

  1332.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_y;

  1333.             else

  1334.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_y;

  1335.         }

  1336.     }

  1337.     if (v->cur_field_type && !v->ref_field_type[dir]) {

  1338.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1339.     } else {

  1340.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1341.     }

  1342. }

  1343. 

  1344. static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */,

  1345.                                          int dim, int dir)

  1346. {

  1347.     int brfd, scalesame;

  1348.     int hpel = 1 - v->s.quarter_sample;

  1349. 

  1350.     n >>= hpel;

  1351.     if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {

  1352.         if (dim)

  1353.             n = scaleforsame_y(v, i, n, dir) << hpel;

  1354.         else

  1355.             n = scaleforsame_x(v, n, dir) << hpel;

  1356.         return n;

  1357.     }

  1358.     brfd      = FFMIN(v->brfd, 3);

  1359.     scalesame = ff_vc1_b_field_mvpred_scales[0][brfd];

  1360. 

  1361.     n = (n * scalesame >> 8) << hpel;

  1362.     return n;

  1363. }

  1364. 

  1365. static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */,

  1366.                                         int dim, int dir)

  1367. {

  1368.     int refdist, scaleopp;

  1369.     int hpel = 1 - v->s.quarter_sample;

  1370. 

  1371.     n >>= hpel;

  1372.     if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) {

  1373.         if (dim)

  1374.             n = scaleforopp_y(v, n, dir) << hpel;

  1375.         else

  1376.             n = scaleforopp_x(v, n) << hpel;

  1377.         return n;

  1378.     }

  1379.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1380.         refdist = FFMIN(v->refdist, 3);

  1381.     else

  1382.         refdist = dir ? v->brfd : v->frfd;

  1383.     scaleopp = ff_vc1_field_mvpred_scales[dir ^ v->second_field][0][refdist];

  1384. 

  1385.     n = (n * scaleopp >> 8) << hpel;

  1386.     return n;

  1387. }

  1388. 

  1389. /** Predict and set motion vector

  1390.  */

  1391. static inline void vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,

  1392.                                int mv1, int r_x, int r_y, uint8_t* is_intra,

  1393.                                int pred_flag, int dir)

  1394. {

  1395.     MpegEncContext *s = &v->s;

  1396.     int xy, wrap, off = 0;

  1397.     int16_t *A, *B, *C;

  1398.     int px, py;

  1399.     int sum;

  1400.     int mixedmv_pic, num_samefield = 0, num_oppfield = 0;

  1401.     int opposite, a_f, b_f, c_f;

  1402.     int16_t field_predA[2];

  1403.     int16_t field_predB[2];

  1404.     int16_t field_predC[2];

  1405.     int a_valid, b_valid, c_valid;

  1406.     int hybridmv_thresh, y_bias = 0;

  1407. 

  1408.     if (v->mv_mode == MV_PMODE_MIXED_MV ||

  1409.         ((v->mv_mode == MV_PMODE_INTENSITY_COMP) && (v->mv_mode2 == MV_PMODE_MIXED_MV)))

  1410.         mixedmv_pic = 1;

  1411.     else

  1412.         mixedmv_pic = 0;

  1413.     /* scale MV difference to be quad-pel */

  1414.     dmv_x <<= 1 - s->quarter_sample;

  1415.     dmv_y <<= 1 - s->quarter_sample;

  1416. 

  1417.     wrap = s->b8_stride;

  1418.     xy   = s->block_index[n];

  1419. 

  1420.     if (s->mb_intra) {

  1421.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy + v->blocks_off][0] = 0;

  1422.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy + v->blocks_off][1] = 0;

  1423.         s->current_picture.motion_val[1][xy + v->blocks_off][0] = 0;

  1424.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = 0;

  1425.         if (mv1) { /* duplicate motion data for 1-MV block */

  1426.             s->current_picture.motion_val[0][xy + 1 + v->blocks_off][0]        = 0;

  1427.             s->current_picture.motion_val[0][xy + 1 + v->blocks_off][1]        = 0;

  1428.             s->current_picture.motion_val[0][xy + wrap + v->blocks_off][0]     = 0;

  1429.             s->current_picture.motion_val[0][xy + wrap + v->blocks_off][1]     = 0;

  1430.             s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][0] = 0;

  1431.             s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][1] = 0;

  1432.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  1433.             s->current_picture.motion_val[1][xy + 1 + v->blocks_off][0]        = 0;

  1434.             s->current_picture.motion_val[1][xy + 1 + v->blocks_off][1]        = 0;

  1435.             s->current_picture.motion_val[1][xy + wrap][0]                     = 0;

  1436.             s->current_picture.motion_val[1][xy + wrap + v->blocks_off][1]     = 0;

  1437.             s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][0] = 0;

  1438.             s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][1] = 0;

  1439.         }

  1440.         return;

  1441.     }

  1442. 

  1443.     C = s->current_picture.motion_val[dir][xy -    1 + v->blocks_off];

  1444.     A = s->current_picture.motion_val[dir][xy - wrap + v->blocks_off];

  1445.     if (mv1) {

  1446.         if (v->field_mode && mixedmv_pic)

  1447.             off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1448.         else

  1449.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1450.     } else {

  1451.         //in 4-MV mode different blocks have different B predictor position

  1452.         switch (n) {

  1453.         case 0:

  1454.             off = (s->mb_x > 0) ? -1 : 1;

  1455.             break;

  1456.         case 1:

  1457.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1458.             break;

  1459.         case 2:

  1460.             off = 1;

  1461.             break;

  1462.         case 3:

  1463.             off = -1;

  1464.         }

  1465.     }

  1466.     B = s->current_picture.motion_val[dir][xy - wrap + off + v->blocks_off];

  1467. 

  1468.     a_valid = !s->first_slice_line || (n == 2 || n == 3);

  1469.     b_valid = a_valid && (s->mb_width > 1);

  1470.     c_valid = s->mb_x || (n == 1 || n == 3);

  1471.     if (v->field_mode) {

  1472.         a_valid = a_valid && !is_intra[xy - wrap];

  1473.         b_valid = b_valid && !is_intra[xy - wrap + off];

  1474.         c_valid = c_valid && !is_intra[xy - 1];

  1475.     }

  1476. 

  1477.     if (a_valid) {

  1478.         a_f = v->mv_f[dir][xy - wrap + v->blocks_off];

  1479.         num_oppfield  += a_f;

  1480.         num_samefield += 1 - a_f;

  1481.         field_predA[0] = A[0];

  1482.         field_predA[1] = A[1];

  1483.     } else {

  1484.         field_predA[0] = field_predA[1] = 0;

  1485.         a_f = 0;

  1486.     }

  1487.     if (b_valid) {

  1488.         b_f = v->mv_f[dir][xy - wrap + off + v->blocks_off];

  1489.         num_oppfield  += b_f;

  1490.         num_samefield += 1 - b_f;

  1491.         field_predB[0] = B[0];

  1492.         field_predB[1] = B[1];

  1493.     } else {

  1494.         field_predB[0] = field_predB[1] = 0;

  1495.         b_f = 0;

  1496.     }

  1497.     if (c_valid) {

  1498.         c_f = v->mv_f[dir][xy - 1 + v->blocks_off];

  1499.         num_oppfield  += c_f;

  1500.         num_samefield += 1 - c_f;

  1501.         field_predC[0] = C[0];

  1502.         field_predC[1] = C[1];

  1503.     } else {

  1504.         field_predC[0] = field_predC[1] = 0;

  1505.         c_f = 0;

  1506.     }

  1507. 

  1508.     if (v->field_mode) {

  1509.         if (!v->numref)

  1510.             // REFFIELD determines if the last field or the second-last field is

  1511.             // to be used as reference

  1512.             opposite = 1 - v->reffield;

  1513.         else {

  1514.             if (num_samefield <= num_oppfield)

  1515.                 opposite = 1 - pred_flag;

  1516.             else

  1517.                 opposite = pred_flag;

  1518.         }

  1519.     } else

  1520.         opposite = 0;

  1521.     if (opposite) {

  1522.         if (a_valid && !a_f) {

  1523.             field_predA[0] = scaleforopp(v, field_predA[0], 0, dir);

  1524.             field_predA[1] = scaleforopp(v, field_predA[1], 1, dir);

  1525.         }

  1526.         if (b_valid && !b_f) {

  1527.             field_predB[0] = scaleforopp(v, field_predB[0], 0, dir);

  1528.             field_predB[1] = scaleforopp(v, field_predB[1], 1, dir);

  1529.         }

  1530.         if (c_valid && !c_f) {

  1531.             field_predC[0] = scaleforopp(v, field_predC[0], 0, dir);

  1532.             field_predC[1] = scaleforopp(v, field_predC[1], 1, dir);

  1533.         }

  1534.         v->mv_f[dir][xy + v->blocks_off] = 1;

  1535.         v->ref_field_type[dir] = !v->cur_field_type;

  1536.     } else {

  1537.         if (a_valid && a_f) {

  1538.             field_predA[0] = scaleforsame(v, n, field_predA[0], 0, dir);

  1539.             field_predA[1] = scaleforsame(v, n, field_predA[1], 1, dir);

  1540.         }

  1541.         if (b_valid && b_f) {

  1542.             field_predB[0] = scaleforsame(v, n, field_predB[0], 0, dir);

  1543.             field_predB[1] = scaleforsame(v, n, field_predB[1], 1, dir);

  1544.         }

  1545.         if (c_valid && c_f) {

  1546.             field_predC[0] = scaleforsame(v, n, field_predC[0], 0, dir);

  1547.             field_predC[1] = scaleforsame(v, n, field_predC[1], 1, dir);

  1548.         }

  1549.         v->mv_f[dir][xy + v->blocks_off] = 0;

  1550.         v->ref_field_type[dir] = v->cur_field_type;

  1551.     }

  1552. 

  1553.     if (a_valid) {

  1554.         px = field_predA[0];

  1555.         py = field_predA[1];

  1556.     } else if (c_valid) {

  1557.         px = field_predC[0];

  1558.         py = field_predC[1];

  1559.     } else if (b_valid) {

  1560.         px = field_predB[0];

  1561.         py = field_predB[1];

  1562.     } else {

  1563.         px = 0;

  1564.         py = 0;

  1565.     }

  1566. 

  1567.     if (num_samefield + num_oppfield > 1) {

  1568.         px = mid_pred(field_predA[0], field_predB[0], field_predC[0]);

  1569.         py = mid_pred(field_predA[1], field_predB[1], field_predC[1]);

  1570.     }

  1571. 

  1572.     /* Pullback MV as specified in 8.3.5.3.4 */

  1573.     if (!v->field_mode) {

  1574.         int qx, qy, X, Y;

  1575.         qx = (s->mb_x << 6) + ((n == 1 || n == 3) ? 32 : 0);

  1576.         qy = (s->mb_y << 6) + ((n == 2 || n == 3) ? 32 : 0);

  1577.         X  = (s->mb_width  << 6) - 4;

  1578.         Y  = (s->mb_height << 6) - 4;

  1579.         if (mv1) {

  1580.             if (qx + px < -60) px = -60 - qx;

  1581.             if (qy + py < -60) py = -60 - qy;

  1582.         } else {

  1583.             if (qx + px < -28) px = -28 - qx;

  1584.             if (qy + py < -28) py = -28 - qy;

  1585.         }

  1586.         if (qx + px > X) px = X - qx;

  1587.         if (qy + py > Y) py = Y - qy;

  1588.     }

  1589. 

  1590.     if (!v->field_mode || s->pict_type != AV_PICTURE_TYPE_B) {

  1591.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 (also 10.3.5.4.3.5) */

  1592.         hybridmv_thresh = 32;

  1593.         if (a_valid && c_valid) {

  1594.             if (is_intra[xy - wrap])

  1595.                 sum = FFABS(px) + FFABS(py);

  1596.             else

  1597.                 sum = FFABS(px - field_predA[0]) + FFABS(py - field_predA[1]);

  1598.             if (sum > hybridmv_thresh) {

  1599.                 if (get_bits1(&s->gb)) {     // read HYBRIDPRED bit

  1600.                     px = field_predA[0];

  1601.                     py = field_predA[1];

  1602.                 } else {

  1603.                     px = field_predC[0];

  1604.                     py = field_predC[1];

  1605.                 }

  1606.             } else {

  1607.                 if (is_intra[xy - 1])

  1608.                     sum = FFABS(px) + FFABS(py);

  1609.                 else

  1610.                     sum = FFABS(px - field_predC[0]) + FFABS(py - field_predC[1]);

  1611.                 if (sum > hybridmv_thresh) {

  1612.                     if (get_bits1(&s->gb)) {

  1613.                         px = field_predA[0];

  1614.                         py = field_predA[1];

  1615.                     } else {

  1616.                         px = field_predC[0];

  1617.                         py = field_predC[1];

  1618.                     }

  1619.                 }

  1620.             }

  1621.         }

  1622.     }

  1623. 

  1624.     if (v->field_mode && v->numref)

  1625.         r_y >>= 1;

  1626.     if (v->field_mode && v->cur_field_type && v->ref_field_type[dir] == 0)

  1627.         y_bias = 1;

  1628.     /* store MV using signed modulus of MV range defined in 4.11 */

  1629.     s->mv[dir][n][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1630.     s->mv[dir][n][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1] = ((py + dmv_y + r_y - y_bias) & ((r_y << 1) - 1)) - r_y + y_bias;

  1631.     if (mv1) { /* duplicate motion data for 1-MV block */

  1632.         s->current_picture.motion_val[dir][xy +    1 +     v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1633.         s->current_picture.motion_val[dir][xy +    1 +     v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1634.         s->current_picture.motion_val[dir][xy + wrap +     v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1635.         s->current_picture.motion_val[dir][xy + wrap +     v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1636.         s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1637.         s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1638.         v->mv_f[dir][xy +    1 + v->blocks_off] = v->mv_f[dir][xy +            v->blocks_off];

  1639.         v->mv_f[dir][xy + wrap + v->blocks_off] = v->mv_f[dir][xy + wrap + 1 + v->blocks_off] = v->mv_f[dir][xy + v->blocks_off];

  1640.     }

  1641. }

  1642. 

  1643. /** Predict and set motion vector for interlaced frame picture MBs

  1644.  */

  1645. static inline void vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,

  1646.                                      int mvn, int r_x, int r_y, uint8_t* is_intra, int dir)

  1647. {

  1648.     MpegEncContext *s = &v->s;

  1649.     int xy, wrap, off = 0;

  1650.     int A[2], B[2], C[2];

  1651.     int px, py;

  1652.     int a_valid = 0, b_valid = 0, c_valid = 0;

  1653.     int field_a, field_b, field_c; // 0: same, 1: opposit

  1654.     int total_valid, num_samefield, num_oppfield;

  1655.     int pos_c, pos_b, n_adj;

  1656. 

  1657.     wrap = s->b8_stride;

  1658.     xy = s->block_index[n];

  1659. 

  1660.     if (s->mb_intra) {

  1661.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1662.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1663.         s->current_picture.motion_val[1][xy][0] = 0;

  1664.         s->current_picture.motion_val[1][xy][1] = 0;

  1665.         if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1666.             s->current_picture.motion_val[0][xy + 1][0]        = 0;

  1667.             s->current_picture.motion_val[0][xy + 1][1]        = 0;

  1668.             s->current_picture.motion_val[0][xy + wrap][0]     = 0;

  1669.             s->current_picture.motion_val[0][xy + wrap][1]     = 0;

  1670.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1671.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1672.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  1673.             s->current_picture.motion_val[1][xy + 1][0]        = 0;

  1674.             s->current_picture.motion_val[1][xy + 1][1]        = 0;

  1675.             s->current_picture.motion_val[1][xy + wrap][0]     = 0;

  1676.             s->current_picture.motion_val[1][xy + wrap][1]     = 0;

  1677.             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;

  1678.             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

  1679.         }

  1680.         return;

  1681.     }

  1682. 

  1683.     off = ((n == 0) || (n == 1)) ? 1 : -1;

  1684.     /* predict A */

  1685.     if (s->mb_x || (n == 1) || (n == 3)) {

  1686.         if ((v->blk_mv_type[xy]) // current block (MB) has a field MV

  1687.             || (!v->blk_mv_type[xy] && !v->blk_mv_type[xy - 1])) { // or both have frame MV

  1688.             A[0] = s->current_picture.motion_val[dir][xy - 1][0];

  1689.             A[1] = s->current_picture.motion_val[dir][xy - 1][1];

  1690.             a_valid = 1;

  1691.         } else { // current block has frame mv and cand. has field MV (so average)

  1692.             A[0] = (s->current_picture.motion_val[dir][xy - 1][0]

  1693.                     + s->current_picture.motion_val[dir][xy - 1 + off * wrap][0] + 1) >> 1;

  1694.             A[1] = (s->current_picture.motion_val[dir][xy - 1][1]

  1695.                     + s->current_picture.motion_val[dir][xy - 1 + off * wrap][1] + 1) >> 1;

  1696.             a_valid = 1;

  1697.         }

  1698.         if (!(n & 1) && v->is_intra[s->mb_x - 1]) {

  1699.             a_valid = 0;

  1700.             A[0] = A[1] = 0;

  1701.         }

  1702.     } else

  1703.         A[0] = A[1] = 0;

  1704.     /* Predict B and C */

  1705.     B[0] = B[1] = C[0] = C[1] = 0;

  1706.     if (n == 0 || n == 1 || v->blk_mv_type[xy]) {

  1707.         if (!s->first_slice_line) {

  1708.             if (!v->is_intra[s->mb_x - s->mb_stride]) {

  1709.                 b_valid = 1;

  1710.                 n_adj   = n | 2;

  1711.                 pos_b   = s->block_index[n_adj] - 2 * wrap;

  1712.                 if (v->blk_mv_type[pos_b] && v->blk_mv_type[xy]) {

  1713.                     n_adj = (n & 2) | (n & 1);

  1714.                 }

  1715.                 B[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap][0];

  1716.                 B[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap][1];

  1717.                 if (v->blk_mv_type[pos_b] && !v->blk_mv_type[xy]) {

  1718.                     B[0] = (B[0] + s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap][0] + 1) >> 1;

  1719.                     B[1] = (B[1] + s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap][1] + 1) >> 1;

  1720.                 }

  1721.             }

  1722.             if (s->mb_width > 1) {

  1723.                 if (!v->is_intra[s->mb_x - s->mb_stride + 1]) {

  1724.                     c_valid = 1;

  1725.                     n_adj   = 2;

  1726.                     pos_c   = s->block_index[2] - 2 * wrap + 2;

  1727.                     if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1728.                         n_adj = n & 2;

  1729.                     }

  1730.                     C[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap + 2][0];

  1731.                     C[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap + 2][1];

  1732.                     if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1733.                         C[0] = (1 + C[0] + (s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap + 2][0])) >> 1;

  1734.                         C[1] = (1 + C[1] + (s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap + 2][1])) >> 1;

  1735.                     }

  1736.                     if (s->mb_x == s->mb_width - 1) {

  1737.                         if (!v->is_intra[s->mb_x - s->mb_stride - 1]) {

  1738.                             c_valid = 1;

  1739.                             n_adj   = 3;

  1740.                             pos_c   = s->block_index[3] - 2 * wrap - 2;

  1741.                             if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1742.                                 n_adj = n | 1;

  1743.                             }

  1744.                             C[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap - 2][0];

  1745.                             C[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap - 2][1];

  1746.                             if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1747.                                 C[0] = (1 + C[0] + s->current_picture.motion_val[dir][s->block_index[1] - 2 * wrap - 2][0]) >> 1;

  1748.                                 C[1] = (1 + C[1] + s->current_picture.motion_val[dir][s->block_index[1] - 2 * wrap - 2][1]) >> 1;

  1749.                             }

  1750.                         } else

  1751.                             c_valid = 0;

  1752.                     }

  1753.                 }

  1754.             }

  1755.         }

  1756.     } else {

  1757.         pos_b   = s->block_index[1];

  1758.         b_valid = 1;

  1759.         B[0]    = s->current_picture.motion_val[dir][pos_b][0];

  1760.         B[1]    = s->current_picture.motion_val[dir][pos_b][1];

  1761.         pos_c   = s->block_index[0];

  1762.         c_valid = 1;

  1763.         C[0]    = s->current_picture.motion_val[dir][pos_c][0];

  1764.         C[1]    = s->current_picture.motion_val[dir][pos_c][1];

  1765.     }

  1766. 

  1767.     total_valid = a_valid + b_valid + c_valid;

  1768.     // check if predictor A is out of bounds

  1769.     if (!s->mb_x && !(n == 1 || n == 3)) {

  1770.         A[0] = A[1] = 0;

  1771.     }

  1772.     // check if predictor B is out of bounds

  1773.     if ((s->first_slice_line && v->blk_mv_type[xy]) || (s->first_slice_line && !(n & 2))) {

  1774.         B[0] = B[1] = C[0] = C[1] = 0;

  1775.     }

  1776.     if (!v->blk_mv_type[xy]) {

  1777.         if (s->mb_width == 1) {

  1778.             px = B[0];

  1779.             py = B[1];

  1780.         } else {

  1781.             if (total_valid >= 2) {

  1782.                 px = mid_pred(A[0], B[0], C[0]);

  1783.                 py = mid_pred(A[1], B[1], C[1]);

  1784.             } else if (total_valid) {

  1785.                 if      (a_valid) { px = A[0]; py = A[1]; }

  1786.                 else if (b_valid) { px = B[0]; py = B[1]; }

  1787.                 else if (c_valid) { px = C[0]; py = C[1]; }

  1788.                 else av_assert2(0);

  1789.             } else

  1790.                 px = py = 0;

  1791.         }

  1792.     } else {

  1793.         if (a_valid)

  1794.             field_a = (A[1] & 4) ? 1 : 0;

  1795.         else

  1796.             field_a = 0;

  1797.         if (b_valid)

  1798.             field_b = (B[1] & 4) ? 1 : 0;

  1799.         else

  1800.             field_b = 0;

  1801.         if (c_valid)

  1802.             field_c = (C[1] & 4) ? 1 : 0;

  1803.         else

  1804.             field_c = 0;

  1805. 

  1806.         num_oppfield  = field_a + field_b + field_c;

  1807.         num_samefield = total_valid - num_oppfield;

  1808.         if (total_valid == 3) {

  1809.             if ((num_samefield == 3) || (num_oppfield == 3)) {

  1810.                 px = mid_pred(A[0], B[0], C[0]);

  1811.                 py = mid_pred(A[1], B[1], C[1]);

  1812.             } else if (num_samefield >= num_oppfield) {

  1813.                 /* take one MV from same field set depending on priority

  1814.                 the check for B may not be necessary */

  1815.                 px = !field_a ? A[0] : B[0];

  1816.                 py = !field_a ? A[1] : B[1];

  1817.             } else {

  1818.                 px =  field_a ? A[0] : B[0];

  1819.                 py =  field_a ? A[1] : B[1];

  1820.             }

  1821.         } else if (total_valid == 2) {

  1822.             if (num_samefield >= num_oppfield) {

  1823.                 if (!field_a && a_valid) {

  1824.                     px = A[0];

  1825.                     py = A[1];

  1826.                 } else if (!field_b && b_valid) {

  1827.                     px = B[0];

  1828.                     py = B[1];

  1829.                 } else if (c_valid) {

  1830.                     px = C[0];

  1831.                     py = C[1];

  1832.                 } else px = py = 0;

  1833.             } else {

  1834.                 if (field_a && a_valid) {

  1835.                     px = A[0];

  1836.                     py = A[1];

  1837.                 } else if (field_b && b_valid) {

  1838.                     px = B[0];

  1839.                     py = B[1];

  1840.                 } else if (c_valid) {

  1841.                     px = C[0];

  1842.                     py = C[1];

  1843.                 } else px = py = 0;

  1844.             }

  1845.         } else if (total_valid == 1) {

  1846.             px = (a_valid) ? A[0] : ((b_valid) ? B[0] : C[0]);

  1847.             py = (a_valid) ? A[1] : ((b_valid) ? B[1] : C[1]);

  1848.         } else

  1849.             px = py = 0;

  1850.     }

  1851. 

  1852.     /* store MV using signed modulus of MV range defined in 4.11 */

  1853.     s->mv[dir][n][0] = s->current_picture.motion_val[dir][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1854.     s->mv[dir][n][1] = s->current_picture.motion_val[dir][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1855.     if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1856.         s->current_picture.motion_val[dir][xy +    1    ][0] = s->current_picture.motion_val[dir][xy][0];

  1857.         s->current_picture.motion_val[dir][xy +    1    ][1] = s->current_picture.motion_val[dir][xy][1];

  1858.         s->current_picture.motion_val[dir][xy + wrap    ][0] = s->current_picture.motion_val[dir][xy][0];

  1859.         s->current_picture.motion_val[dir][xy + wrap    ][1] = s->current_picture.motion_val[dir][xy][1];

  1860.         s->current_picture.motion_val[dir][xy + wrap + 1][0] = s->current_picture.motion_val[dir][xy][0];

  1861.         s->current_picture.motion_val[dir][xy + wrap + 1][1] = s->current_picture.motion_val[dir][xy][1];

  1862.     } else if (mvn == 2) { /* duplicate motion data for 2-Field MV block */

  1863.         s->current_picture.motion_val[dir][xy + 1][0] = s->current_picture.motion_val[dir][xy][0];

  1864.         s->current_picture.motion_val[dir][xy + 1][1] = s->current_picture.motion_val[dir][xy][1];

  1865.         s->mv[dir][n + 1][0] = s->mv[dir][n][0];

  1866.         s->mv[dir][n + 1][1] = s->mv[dir][n][1];

  1867.     }

  1868. }

  1869. 

  1870. /** Motion compensation for direct or interpolated blocks in B-frames

  1871.  */

  1872. static void vc1_interp_mc(VC1Context *v)

  1873. {

  1874.     MpegEncContext *s = &v->s;

  1875.     H264ChromaContext *h264chroma = &v->h264chroma;

  1876.     uint8_t *srcY, *srcU, *srcV;

  1877.     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1878.     int off, off_uv;

  1879.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  1880.     int use_ic = v->next_use_ic;

  1881. 

  1882.     if (!v->field_mode && !v->s.next_picture.f.data[0])

  1883.         return;

  1884. 

  1885.     mx   = s->mv[1][0][0];

  1886.     my   = s->mv[1][0][1];

  1887.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1888.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1889.     if (v->field_mode) {

  1890.         if (v->cur_field_type != v->ref_field_type[1])

  1891.             my   = my   - 2 + 4 * v->cur_field_type;

  1892.             uvmy = uvmy - 2 + 4 * v->cur_field_type;

  1893.     }

  1894.     if (v->fastuvmc) {

  1895.         uvmx = uvmx + ((uvmx < 0) ? -(uvmx & 1) : (uvmx & 1));

  1896.         uvmy = uvmy + ((uvmy < 0) ? -(uvmy & 1) : (uvmy & 1));

  1897.     }

  1898.     srcY = s->next_picture.f.data[0];

  1899.     srcU = s->next_picture.f.data[1];

  1900.     srcV = s->next_picture.f.data[2];

  1901. 

  1902.     src_x   = s->mb_x * 16 + (mx   >> 2);

  1903.     src_y   = s->mb_y * 16 + (my   >> 2);

  1904.     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);

  1905.     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

  1906. 

  1907.     if (v->profile != PROFILE_ADVANCED) {

  1908.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1909.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1910.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1911.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1912.     } else {

  1913.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1914.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1915.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1916.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1917.     }

  1918. 

  1919.     srcY += src_y   * s->linesize   + src_x;

  1920.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1921.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1922. 

  1923.     if (v->field_mode && v->ref_field_type[1]) {

  1924.         srcY += s->current_picture_ptr->f.linesize[0];

  1925.         srcU += s->current_picture_ptr->f.linesize[1];

  1926.         srcV += s->current_picture_ptr->f.linesize[2];

  1927.     }

  1928. 

  1929.     /* for grayscale we should not try to read from unknown area */

  1930.     if (s->flags & CODEC_FLAG_GRAY) {

  1931.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1932.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1933.     }

  1934. 

  1935.     if (v->rangeredfrm || s->h_edge_pos < 22 || v_edge_pos < 22 || use_ic

  1936.         || (unsigned)(src_x - 1) > s->h_edge_pos - (mx & 3) - 16 - 3

  1937.         || (unsigned)(src_y - 1) > v_edge_pos    - (my & 3) - 16 - 3) {

  1938.         uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

  1939. 

  1940.         srcY -= s->mspel * (1 + s->linesize);

  1941.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize,

  1942.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

  1943.                                  src_x - s->mspel, src_y - s->mspel,

  1944.                                  s->h_edge_pos, v_edge_pos);

  1945.         srcY = s->edge_emu_buffer;

  1946.         s->vdsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8 + 1, 8 + 1,

  1947.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1948.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8 + 1, 8 + 1,

  1949.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1950.         srcU = uvbuf;

  1951.         srcV = uvbuf + 16;

  1952.         /* if we deal with range reduction we need to scale source blocks */

  1953.         if (v->rangeredfrm) {

  1954.             int i, j;

  1955.             uint8_t *src, *src2;

  1956. 

  1957.             src = srcY;

  1958.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  1959.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  1960.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1961.                 src += s->linesize;

  1962.             }

  1963.             src = srcU;

  1964.             src2 = srcV;

  1965.             for (j = 0; j < 9; j++) {

  1966.                 for (i = 0; i < 9; i++) {

  1967.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  1968.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1969.                 }

  1970.                 src  += s->uvlinesize;

  1971.                 src2 += s->uvlinesize;

  1972.             }

  1973.         }

  1974. 

  1975.         if (use_ic) {

  1976.             const uint8_t *luty = v->next_luty [v->ref_field_type[1]];

  1977.             const uint8_t *lutuv= v->next_lutuv[v->ref_field_type[1]];

  1978.             int i, j;

  1979.             uint8_t *src, *src2;

  1980. 

  1981.             src = srcY;

  1982.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  1983.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  1984.                     src[i] = luty[src[i]];

  1985.                 src += s->linesize;

  1986.             }

  1987.             src  = srcU;

  1988.             src2 = srcV;

  1989.             for (j = 0; j < 9; j++) {

  1990.                 for (i = 0; i < 9; i++) {

  1991.                     src[i]  = lutuv[src[i]];

  1992.                     src2[i] = lutuv[src2[i]];

  1993.                 }

  1994.                 src  += s->uvlinesize;

  1995.                 src2 += s->uvlinesize;

  1996.             }

  1997.         }

  1998.         srcY += s->mspel * (1 + s->linesize);

  1999.     }

  2000. 

  2001.         off    = 0;

  2002.         off_uv = 0;

  2003. 

  2004.     if (s->mspel) {

  2005.         dxy = ((my & 3) << 2) | (mx & 3);

  2006.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);

  2007.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);

  2008.         srcY += s->linesize * 8;

  2009.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  2010.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  2011.     } else { // hpel mc

  2012.         dxy = (my & 2) | ((mx & 2) >> 1);

  2013. 

  2014.         if (!v->rnd)

  2015.             s->hdsp.avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  2016.         else

  2017.             s->hdsp.avg_no_rnd_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize, 16);

  2018.     }

  2019. 

  2020.     if (s->flags & CODEC_FLAG_GRAY) return;

  2021.     /* Chroma MC always uses qpel blilinear */

  2022.     uvmx = (uvmx & 3) << 1;

  2023.     uvmy = (uvmy & 3) << 1;

  2024.     if (!v->rnd) {

  2025.         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  2026.         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  2027.     } else {

  2028.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  2029.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  2030.     }

  2031. }

  2032. 

  2033. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  2034. {

  2035.     int n = bfrac;

  2036. 

  2037. #if B_FRACTION_DEN==256

  2038.     if (inv)

  2039.         n -= 256;

  2040.     if (!qs)

  2041.         return 2 * ((value * n + 255) >> 9);

  2042.     return (value * n + 128) >> 8;

  2043. #else

  2044.     if (inv)

  2045.         n -= B_FRACTION_DEN;

  2046.     if (!qs)

  2047.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  2048.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  2049. #endif

  2050. }

  2051. 

  2052. /** Reconstruct motion vector for B-frame and do motion compensation

  2053.  */

  2054. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],

  2055.                             int direct, int mode)

  2056. {

  2057.     int use_ic = v->next_use_ic || v->curr_use_ic || v->last_use_ic;

  2058.     if (use_ic) {

  2059.         v->mv_mode2 = v->mv_mode;

  2060.         v->mv_mode  = MV_PMODE_INTENSITY_COMP;

  2061.     }

  2062.     if (direct) {

  2063.         vc1_mc_1mv(v, 0);

  2064.         vc1_interp_mc(v);

  2065.         if (use_ic)

  2066.             v->mv_mode = v->mv_mode2;

  2067.         return;

  2068.     }

  2069.     if (mode == BMV_TYPE_INTERPOLATED) {

  2070.         vc1_mc_1mv(v, 0);

  2071.         vc1_interp_mc(v);

  2072.         if (use_ic)

  2073.             v->mv_mode = v->mv_mode2;

  2074.         return;

  2075.     }

  2076. 

  2077.     if (use_ic && (mode == BMV_TYPE_BACKWARD))

  2078.         v->mv_mode = v->mv_mode2;

  2079.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  2080.     if (use_ic)

  2081.         v->mv_mode = v->mv_mode2;

  2082. }

  2083. 

  2084. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],

  2085.                                  int direct, int mvtype)

  2086. {

  2087.     MpegEncContext *s = &v->s;

  2088.     int xy, wrap, off = 0;

  2089.     int16_t *A, *B, *C;

  2090.     int px, py;

  2091.     int sum;

  2092.     int r_x, r_y;

  2093.     const uint8_t *is_intra = v->mb_type[0];

  2094. 

  2095.     r_x = v->range_x;

  2096.     r_y = v->range_y;

  2097.     /* scale MV difference to be quad-pel */

  2098.     dmv_x[0] <<= 1 - s->quarter_sample;

  2099.     dmv_y[0] <<= 1 - s->quarter_sample;

  2100.     dmv_x[1] <<= 1 - s->quarter_sample;

  2101.     dmv_y[1] <<= 1 - s->quarter_sample;

  2102. 

  2103.     wrap = s->b8_stride;

  2104.     xy = s->block_index[0];

  2105. 

  2106.     if (s->mb_intra) {

  2107.         s->current_picture.motion_val[0][xy + v->blocks_off][0] =

  2108.         s->current_picture.motion_val[0][xy + v->blocks_off][1] =

  2109.         s->current_picture.motion_val[1][xy + v->blocks_off][0] =

  2110.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = 0;

  2111.         return;

  2112.     }

  2113.     if (!v->field_mode) {

  2114.         s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  2115.         s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  2116.         s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  2117.         s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  2118. 

  2119.         /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  2120.         s->mv[0][0][0] = av_clip(s->mv[0][0][0], -60 - (s->mb_x << 6), (s->mb_width  << 6) - 4 - (s->mb_x << 6));

  2121.         s->mv[0][0][1] = av_clip(s->mv[0][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6));

  2122.         s->mv[1][0][0] = av_clip(s->mv[1][0][0], -60 - (s->mb_x << 6), (s->mb_width  << 6) - 4 - (s->mb_x << 6));

  2123.         s->mv[1][0][1] = av_clip(s->mv[1][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6));

  2124.     }

  2125.     if (direct) {

  2126.         s->current_picture.motion_val[0][xy + v->blocks_off][0] = s->mv[0][0][0];

  2127.         s->current_picture.motion_val[0][xy + v->blocks_off][1] = s->mv[0][0][1];

  2128.         s->current_picture.motion_val[1][xy + v->blocks_off][0] = s->mv[1][0][0];

  2129.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = s->mv[1][0][1];

  2130.         return;

  2131.     }

  2132. 

  2133.     if ((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2134.         C   = s->current_picture.motion_val[0][xy - 2];

  2135.         A   = s->current_picture.motion_val[0][xy - wrap * 2];

  2136.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2137.         B   = s->current_picture.motion_val[0][xy - wrap * 2 + off];

  2138. 

  2139.         if (!s->mb_x) C[0] = C[1] = 0;

  2140.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2141.             if (s->mb_width == 1) {

  2142.                 px = A[0];

  2143.                 py = A[1];

  2144.             } else {

  2145.                 px = mid_pred(A[0], B[0], C[0]);

  2146.                 py = mid_pred(A[1], B[1], C[1]);

  2147.             }

  2148.         } else if (s->mb_x) { // predictor C is not out of bounds

  2149.             px = C[0];

  2150.             py = C[1];

  2151.         } else {

  2152.             px = py = 0;

  2153.         }

  2154.         /* Pullback MV as specified in 8.3.5.3.4 */

  2155.         {

  2156.             int qx, qy, X, Y;

  2157.             if (v->profile < PROFILE_ADVANCED) {

  2158.                 qx = (s->mb_x << 5);

  2159.                 qy = (s->mb_y << 5);

  2160.                 X  = (s->mb_width  << 5) - 4;

  2161.                 Y  = (s->mb_height << 5) - 4;

  2162.                 if (qx + px < -28) px = -28 - qx;

  2163.                 if (qy + py < -28) py = -28 - qy;

  2164.                 if (qx + px > X) px = X - qx;

  2165.                 if (qy + py > Y) py = Y - qy;

  2166.             } else {

  2167.                 qx = (s->mb_x << 6);

  2168.                 qy = (s->mb_y << 6);

  2169.                 X  = (s->mb_width  << 6) - 4;

  2170.                 Y  = (s->mb_height << 6) - 4;

  2171.                 if (qx + px < -60) px = -60 - qx;

  2172.                 if (qy + py < -60) py = -60 - qy;

  2173.                 if (qx + px > X) px = X - qx;

  2174.                 if (qy + py > Y) py = Y - qy;

  2175.             }

  2176.         }

  2177.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2178.         if (0 && !s->first_slice_line && s->mb_x) {

  2179.             if (is_intra[xy - wrap])

  2180.                 sum = FFABS(px) + FFABS(py);

  2181.             else

  2182.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2183.             if (sum > 32) {

  2184.                 if (get_bits1(&s->gb)) {

  2185.                     px = A[0];

  2186.                     py = A[1];

  2187.                 } else {

  2188.                     px = C[0];

  2189.                     py = C[1];

  2190.                 }

  2191.             } else {

  2192.                 if (is_intra[xy - 2])

  2193.                     sum = FFABS(px) + FFABS(py);

  2194.                 else

  2195.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2196.                 if (sum > 32) {

  2197.                     if (get_bits1(&s->gb)) {

  2198.                         px = A[0];

  2199.                         py = A[1];

  2200.                     } else {

  2201.                         px = C[0];

  2202.                         py = C[1];

  2203.                     }

  2204.                 }

  2205.             }

  2206.         }

  2207.         /* store MV using signed modulus of MV range defined in 4.11 */

  2208.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2209.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2210.     }

  2211.     if ((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2212.         C   = s->current_picture.motion_val[1][xy - 2];

  2213.         A   = s->current_picture.motion_val[1][xy - wrap * 2];

  2214.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2215.         B   = s->current_picture.motion_val[1][xy - wrap * 2 + off];

  2216. 

  2217.         if (!s->mb_x)

  2218.             C[0] = C[1] = 0;

  2219.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2220.             if (s->mb_width == 1) {

  2221.                 px = A[0];

  2222.                 py = A[1];

  2223.             } else {

  2224.                 px = mid_pred(A[0], B[0], C[0]);

  2225.                 py = mid_pred(A[1], B[1], C[1]);

  2226.             }

  2227.         } else if (s->mb_x) { // predictor C is not out of bounds

  2228.             px = C[0];

  2229.             py = C[1];

  2230.         } else {

  2231.             px = py = 0;

  2232.         }

  2233.         /* Pullback MV as specified in 8.3.5.3.4 */

  2234.         {

  2235.             int qx, qy, X, Y;

  2236.             if (v->profile < PROFILE_ADVANCED) {

  2237.                 qx = (s->mb_x << 5);

  2238.                 qy = (s->mb_y << 5);

  2239.                 X  = (s->mb_width  << 5) - 4;

  2240.                 Y  = (s->mb_height << 5) - 4;

  2241.                 if (qx + px < -28) px = -28 - qx;

  2242.                 if (qy + py < -28) py = -28 - qy;

  2243.                 if (qx + px > X) px = X - qx;

  2244.                 if (qy + py > Y) py = Y - qy;

  2245.             } else {

  2246.                 qx = (s->mb_x << 6);

  2247.                 qy = (s->mb_y << 6);

  2248.                 X  = (s->mb_width  << 6) - 4;

  2249.                 Y  = (s->mb_height << 6) - 4;

  2250.                 if (qx + px < -60) px = -60 - qx;

  2251.                 if (qy + py < -60) py = -60 - qy;

  2252.                 if (qx + px > X) px = X - qx;

  2253.                 if (qy + py > Y) py = Y - qy;

  2254.             }

  2255.         }

  2256.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2257.         if (0 && !s->first_slice_line && s->mb_x) {

  2258.             if (is_intra[xy - wrap])

  2259.                 sum = FFABS(px) + FFABS(py);

  2260.             else

  2261.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2262.             if (sum > 32) {

  2263.                 if (get_bits1(&s->gb)) {

  2264.                     px = A[0];

  2265.                     py = A[1];

  2266.                 } else {

  2267.                     px = C[0];

  2268.                     py = C[1];

  2269.                 }

  2270.             } else {

  2271.                 if (is_intra[xy - 2])

  2272.                     sum = FFABS(px) + FFABS(py);

  2273.                 else

  2274.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2275.                 if (sum > 32) {

  2276.                     if (get_bits1(&s->gb)) {

  2277.                         px = A[0];

  2278.                         py = A[1];

  2279.                     } else {

  2280.                         px = C[0];

  2281.                         py = C[1];

  2282.                     }

  2283.                 }

  2284.             }

  2285.         }

  2286.         /* store MV using signed modulus of MV range defined in 4.11 */

  2287. 

  2288.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2289.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2290.     }

  2291.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2292.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2293.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2294.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2295. }

  2296. 

  2297. static inline void vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y, int mv1, int *pred_flag)

  2298. {

  2299.     int dir = (v->bmvtype == BMV_TYPE_BACKWARD) ? 1 : 0;

  2300.     MpegEncContext *s = &v->s;

  2301.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2302. 

  2303.     if (v->bmvtype == BMV_TYPE_DIRECT) {

  2304.         int total_opp, k, f;

  2305.         if (s->next_picture.mb_type[mb_pos + v->mb_off] != MB_TYPE_INTRA) {

  2306.             s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2307.                                       v->bfraction, 0, s->quarter_sample);

  2308.             s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2309.                                       v->bfraction, 0, s->quarter_sample);

  2310.             s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2311.                                       v->bfraction, 1, s->quarter_sample);

  2312.             s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2313.                                       v->bfraction, 1, s->quarter_sample);

  2314. 

  2315.             total_opp = v->mv_f_next[0][s->block_index[0] + v->blocks_off]

  2316.                       + v->mv_f_next[0][s->block_index[1] + v->blocks_off]

  2317.                       + v->mv_f_next[0][s->block_index[2] + v->blocks_off]

  2318.                       + v->mv_f_next[0][s->block_index[3] + v->blocks_off];

  2319.             f = (total_opp > 2) ? 1 : 0;

  2320.         } else {

  2321.             s->mv[0][0][0] = s->mv[0][0][1] = 0;

  2322.             s->mv[1][0][0] = s->mv[1][0][1] = 0;

  2323.             f = 0;

  2324.         }

  2325.         v->ref_field_type[0] = v->ref_field_type[1] = v->cur_field_type ^ f;

  2326.         for (k = 0; k < 4; k++) {

  2327.             s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][0] = s->mv[0][0][0];

  2328.             s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][1] = s->mv[0][0][1];

  2329.             s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][0] = s->mv[1][0][0];

  2330.             s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][1] = s->mv[1][0][1];

  2331.             v->mv_f[0][s->block_index[k] + v->blocks_off] = f;

  2332.             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;

  2333.         }

  2334.         return;

  2335.     }

  2336.     if (v->bmvtype == BMV_TYPE_INTERPOLATED) {

  2337.         vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0],   1, v->range_x, v->range_y, v->mb_type[0], pred_flag[0], 0);

  2338.         vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1],   1, v->range_x, v->range_y, v->mb_type[0], pred_flag[1], 1);

  2339.         return;

  2340.     }

  2341.     if (dir) { // backward

  2342.         vc1_pred_mv(v, n, dmv_x[1], dmv_y[1], mv1, v->range_x, v->range_y, v->mb_type[0], pred_flag[1], 1);

  2343.         if (n == 3 || mv1) {

  2344.             vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0],   1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  2345.         }

  2346.     } else { // forward

  2347.         vc1_pred_mv(v, n, dmv_x[0], dmv_y[0], mv1, v->range_x, v->range_y, v->mb_type[0], pred_flag[0], 0);

  2348.         if (n == 3 || mv1) {

  2349.             vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1],   1, v->range_x, v->range_y, v->mb_type[0], 0, 1);

  2350.         }

  2351.     }

  2352. }

  2353. 

  2354. /** Get predicted DC value for I-frames only

  2355.  * prediction dir: left=0, top=1

  2356.  * @param s MpegEncContext

  2357.  * @param overlap flag indicating that overlap filtering is used

  2358.  * @param pq integer part of picture quantizer

  2359.  * @param[in] n block index in the current MB

  2360.  * @param dc_val_ptr Pointer to DC predictor

  2361.  * @param dir_ptr Prediction direction for use in AC prediction

  2362.  */

  2363. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2364.                                 int16_t **dc_val_ptr, int *dir_ptr)

  2365. {

  2366.     int a, b, c, wrap, pred, scale;

  2367.     int16_t *dc_val;

  2368.     static const uint16_t dcpred[32] = {

  2369.         -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2370.              114,  102,   93,   85,   79,   73,   68,   64,

  2371.               60,   57,   54,   51,   49,   47,   45,   43,

  2372.               41,   39,   38,   37,   35,   34,   33

  2373.     };

  2374. 

  2375.     /* find prediction - wmv3_dc_scale always used here in fact */

  2376.     if (n < 4) scale = s->y_dc_scale;

  2377.     else       scale = s->c_dc_scale;

  2378. 

  2379.     wrap   = s->block_wrap[n];

  2380.     dc_val = s->dc_val[0] + s->block_index[n];

  2381. 

  2382.     /* B A

  2383.      * C X

  2384.      */

  2385.     c = dc_val[ - 1];

  2386.     b = dc_val[ - 1 - wrap];

  2387.     a = dc_val[ - wrap];

  2388. 

  2389.     if (pq < 9 || !overlap) {

  2390.         /* Set outer values */

  2391.         if (s->first_slice_line && (n != 2 && n != 3))

  2392.             b = a = dcpred[scale];

  2393.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2394.             b = c = dcpred[scale];

  2395.     } else {

  2396.         /* Set outer values */

  2397.         if (s->first_slice_line && (n != 2 && n != 3))

  2398.             b = a = 0;

  2399.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2400.             b = c = 0;

  2401.     }

  2402. 

  2403.     if (abs(a - b) <= abs(b - c)) {

  2404.         pred     = c;

  2405.         *dir_ptr = 1; // left

  2406.     } else {

  2407.         pred     = a;

  2408.         *dir_ptr = 0; // top

  2409.     }

  2410. 

  2411.     /* update predictor */

  2412.     *dc_val_ptr = &dc_val[0];

  2413.     return pred;

  2414. }

  2415. 

  2416. 

  2417. /** Get predicted DC value

  2418.  * prediction dir: left=0, top=1

  2419.  * @param s MpegEncContext

  2420.  * @param overlap flag indicating that overlap filtering is used

  2421.  * @param pq integer part of picture quantizer

  2422.  * @param[in] n block index in the current MB

  2423.  * @param a_avail flag indicating top block availability

  2424.  * @param c_avail flag indicating left block availability

  2425.  * @param dc_val_ptr Pointer to DC predictor

  2426.  * @param dir_ptr Prediction direction for use in AC prediction

  2427.  */

  2428. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2429.                               int a_avail, int c_avail,

  2430.                               int16_t **dc_val_ptr, int *dir_ptr)

  2431. {

  2432.     int a, b, c, wrap, pred;

  2433.     int16_t *dc_val;

  2434.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2435.     int q1, q2 = 0;

  2436.     int dqscale_index;

  2437. 

  2438.     wrap = s->block_wrap[n];

  2439.     dc_val = s->dc_val[0] + s->block_index[n];

  2440. 

  2441.     /* B A

  2442.      * C X

  2443.      */

  2444.     c = dc_val[ - 1];

  2445.     b = dc_val[ - 1 - wrap];

  2446.     a = dc_val[ - wrap];

  2447.     /* scale predictors if needed */

  2448.     q1 = s->current_picture.qscale_table[mb_pos];

  2449.     dqscale_index = s->y_dc_scale_table[q1] - 1;

  2450.     if (dqscale_index < 0)

  2451.         return 0;

  2452.     if (c_avail && (n != 1 && n != 3)) {

  2453.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2454.         if (q2 && q2 != q1)

  2455.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2456.     }

  2457.     if (a_avail && (n != 2 && n != 3)) {

  2458.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2459.         if (q2 && q2 != q1)

  2460.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2461.     }

  2462.     if (a_avail && c_avail && (n != 3)) {

  2463.         int off = mb_pos;

  2464.         if (n != 1)

  2465.             off--;

  2466.         if (n != 2)

  2467.             off -= s->mb_stride;

  2468.         q2 = s->current_picture.qscale_table[off];

  2469.         if (q2 && q2 != q1)

  2470.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2471.     }

  2472. 

  2473.     if (a_avail && c_avail) {

  2474.         if (abs(a - b) <= abs(b - c)) {

  2475.             pred     = c;

  2476.             *dir_ptr = 1; // left

  2477.         } else {

  2478.             pred     = a;

  2479.             *dir_ptr = 0; // top

  2480.         }

  2481.     } else if (a_avail) {

  2482.         pred     = a;

  2483.         *dir_ptr = 0; // top

  2484.     } else if (c_avail) {

  2485.         pred     = c;

  2486.         *dir_ptr = 1; // left

  2487.     } else {

  2488.         pred     = 0;

  2489.         *dir_ptr = 1; // left

  2490.     }

  2491. 

  2492.     /* update predictor */

  2493.     *dc_val_ptr = &dc_val[0];

  2494.     return pred;

  2495. }

  2496. 

  2497. /** @} */ // Block group

  2498. 

  2499. /**

  2500.  * @name VC1 Macroblock-level functions in Simple/Main Profiles

  2501.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2502.  * @{

  2503.  */

  2504. 

  2505. static inline int vc1_coded_block_pred(MpegEncContext * s, int n,

  2506.                                        uint8_t **coded_block_ptr)

  2507. {

  2508.     int xy, wrap, pred, a, b, c;

  2509. 

  2510.     xy   = s->block_index[n];

  2511.     wrap = s->b8_stride;

  2512. 

  2513.     /* B C

  2514.      * A X

  2515.      */

  2516.     a = s->coded_block[xy - 1       ];

  2517.     b = s->coded_block[xy - 1 - wrap];

  2518.     c = s->coded_block[xy     - wrap];

  2519. 

  2520.     if (b == c) {

  2521.         pred = a;

  2522.     } else {

  2523.         pred = c;

  2524.     }

  2525. 

  2526.     /* store value */

  2527.     *coded_block_ptr = &s->coded_block[xy];

  2528. 

  2529.     return pred;

  2530. }

  2531. 

  2532. /**

  2533.  * Decode one AC coefficient

  2534.  * @param v The VC1 context

  2535.  * @param last Last coefficient

  2536.  * @param skip How much zero coefficients to skip

  2537.  * @param value Decoded AC coefficient value

  2538.  * @param codingset set of VLC to decode data

  2539.  * @see 8.1.3.4

  2540.  */

  2541. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,

  2542.                                 int *value, int codingset)

  2543. {

  2544.     GetBitContext *gb = &v->s.gb;

  2545.     int index, escape, run = 0, level = 0, lst = 0;

  2546. 

  2547.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2548.     if (index != ff_vc1_ac_sizes[codingset] - 1) {

  2549.         run   = vc1_index_decode_table[codingset][index][0];

  2550.         level = vc1_index_decode_table[codingset][index][1];

  2551.         lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;

  2552.         if (get_bits1(gb))

  2553.             level = -level;

  2554.     } else {

  2555.         escape = decode210(gb);

  2556.         if (escape != 2) {

  2557.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2558.             run   = vc1_index_decode_table[codingset][index][0];

  2559.             level = vc1_index_decode_table[codingset][index][1];

  2560.             lst   = index >= vc1_last_decode_table[codingset];

  2561.             if (escape == 0) {

  2562.                 if (lst)

  2563.                     level += vc1_last_delta_level_table[codingset][run];

  2564.                 else

  2565.                     level += vc1_delta_level_table[codingset][run];

  2566.             } else {

  2567.                 if (lst)

  2568.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2569.                 else

  2570.                     run += vc1_delta_run_table[codingset][level] + 1;

  2571.             }

  2572.             if (get_bits1(gb))

  2573.                 level = -level;

  2574.         } else {

  2575.             int sign;

  2576.             lst = get_bits1(gb);

  2577.             if (v->s.esc3_level_length == 0) {

  2578.                 if (v->pq < 8 || v->dquantfrm) { // table 59

  2579.                     v->s.esc3_level_length = get_bits(gb, 3);

  2580.                     if (!v->s.esc3_level_length)

  2581.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2582.                 } else { // table 60

  2583.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  2584.                 }

  2585.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2586.             }

  2587.             run   = get_bits(gb, v->s.esc3_run_length);

  2588.             sign  = get_bits1(gb);

  2589.             level = get_bits(gb, v->s.esc3_level_length);

  2590.             if (sign)

  2591.                 level = -level;

  2592.         }

  2593.     }

  2594. 

  2595.     *last  = lst;

  2596.     *skip  = run;

  2597.     *value = level;

  2598. }

  2599. 

  2600. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2601.  * @param v VC1Context

  2602.  * @param block block to decode

  2603.  * @param[in] n subblock index

  2604.  * @param coded are AC coeffs present or not

  2605.  * @param codingset set of VLC to decode data

  2606.  */

  2607. static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,

  2608.                               int coded, int codingset)

  2609. {

  2610.     GetBitContext *gb = &v->s.gb;

  2611.     MpegEncContext *s = &v->s;

  2612.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2613.     int i;

  2614.     int16_t *dc_val;

  2615.     int16_t *ac_val, *ac_val2;

  2616.     int dcdiff;

  2617. 

  2618.     /* Get DC differential */

  2619.     if (n < 4) {

  2620.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2621.     } else {

  2622.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2623.     }

  2624.     if (dcdiff < 0) {

  2625.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2626.         return -1;

  2627.     }

  2628.     if (dcdiff) {

  2629.         if (dcdiff == 119 /* ESC index value */) {

  2630.             /* TODO: Optimize */

  2631.             if (v->pq == 1)      dcdiff = get_bits(gb, 10);

  2632.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2633.             else                 dcdiff = get_bits(gb, 8);

  2634.         } else {

  2635.             if (v->pq == 1)

  2636.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2637.             else if (v->pq == 2)

  2638.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2639.         }

  2640.         if (get_bits1(gb))

  2641.             dcdiff = -dcdiff;

  2642.     }

  2643. 

  2644.     /* Prediction */

  2645.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2646.     *dc_val = dcdiff;

  2647. 

  2648.     /* Store the quantized DC coeff, used for prediction */

  2649.     if (n < 4) {

  2650.         block[0] = dcdiff * s->y_dc_scale;

  2651.     } else {

  2652.         block[0] = dcdiff * s->c_dc_scale;

  2653.     }

  2654.     /* Skip ? */

  2655.     if (!coded) {

  2656.         goto not_coded;

  2657.     }

  2658. 

  2659.     // AC Decoding

  2660.     i = 1;

  2661. 

  2662.     {

  2663.         int last = 0, skip, value;

  2664.         const uint8_t *zz_table;

  2665.         int scale;

  2666.         int k;

  2667. 

  2668.         scale = v->pq * 2 + v->halfpq;

  2669. 

  2670.         if (v->s.ac_pred) {

  2671.             if (!dc_pred_dir)

  2672.                 zz_table = v->zz_8x8[2];

  2673.             else

  2674.                 zz_table = v->zz_8x8[3];

  2675.         } else

  2676.             zz_table = v->zz_8x8[1];

  2677. 

  2678.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2679.         ac_val2 = ac_val;

  2680.         if (dc_pred_dir) // left

  2681.             ac_val -= 16;

  2682.         else // top

  2683.             ac_val -= 16 * s->block_wrap[n];

  2684. 

  2685.         while (!last) {

  2686.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2687.             i += skip;

  2688.             if (i > 63)

  2689.                 break;

  2690.             block[zz_table[i++]] = value;

  2691.         }

  2692. 

  2693.         /* apply AC prediction if needed */

  2694.         if (s->ac_pred) {

  2695.             if (dc_pred_dir) { // left

  2696.                 for (k = 1; k < 8; k++)

  2697.                     block[k << v->left_blk_sh] += ac_val[k];

  2698.             } else { // top

  2699.                 for (k = 1; k < 8; k++)

  2700.                     block[k << v->top_blk_sh] += ac_val[k + 8];

  2701.             }

  2702.         }

  2703.         /* save AC coeffs for further prediction */

  2704.         for (k = 1; k < 8; k++) {

  2705.             ac_val2[k]     = block[k << v->left_blk_sh];

  2706.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2707.         }

  2708. 

  2709.         /* scale AC coeffs */

  2710.         for (k = 1; k < 64; k++)

  2711.             if (block[k]) {

  2712.                 block[k] *= scale;

  2713.                 if (!v->pquantizer)

  2714.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2715.             }

  2716. 

  2717.         if (s->ac_pred) i = 63;

  2718.     }

  2719. 

  2720. not_coded:

  2721.     if (!coded) {

  2722.         int k, scale;

  2723.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2724.         ac_val2 = ac_val;

  2725. 

  2726.         i = 0;

  2727.         scale = v->pq * 2 + v->halfpq;

  2728.         memset(ac_val2, 0, 16 * 2);

  2729.         if (dc_pred_dir) { // left

  2730.             ac_val -= 16;

  2731.             if (s->ac_pred)

  2732.                 memcpy(ac_val2, ac_val, 8 * 2);

  2733.         } else { // top

  2734.             ac_val -= 16 * s->block_wrap[n];

  2735.             if (s->ac_pred)

  2736.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2737.         }

  2738. 

  2739.         /* apply AC prediction if needed */

  2740.         if (s->ac_pred) {

  2741.             if (dc_pred_dir) { //left

  2742.                 for (k = 1; k < 8; k++) {

  2743.                     block[k << v->left_blk_sh] = ac_val[k] * scale;

  2744.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2745.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -v->pq : v->pq;

  2746.                 }

  2747.             } else { // top

  2748.                 for (k = 1; k < 8; k++) {

  2749.                     block[k << v->top_blk_sh] = ac_val[k + 8] * scale;

  2750.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2751.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -v->pq : v->pq;

  2752.                 }

  2753.             }

  2754.             i = 63;

  2755.         }

  2756.     }

  2757.     s->block_last_index[n] = i;

  2758. 

  2759.     return 0;

  2760. }

  2761. 

  2762. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2763.  * @param v VC1Context

  2764.  * @param block block to decode

  2765.  * @param[in] n subblock number

  2766.  * @param coded are AC coeffs present or not

  2767.  * @param codingset set of VLC to decode data

  2768.  * @param mquant quantizer value for this macroblock

  2769.  */

  2770. static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,

  2771.                                   int coded, int codingset, int mquant)

  2772. {

  2773.     GetBitContext *gb = &v->s.gb;

  2774.     MpegEncContext *s = &v->s;

  2775.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2776.     int i;

  2777.     int16_t *dc_val = NULL;

  2778.     int16_t *ac_val, *ac_val2;

  2779.     int dcdiff;

  2780.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2781.     int use_pred = s->ac_pred;

  2782.     int scale;

  2783.     int q1, q2 = 0;

  2784.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2785. 

  2786.     /* Get DC differential */

  2787.     if (n < 4) {

  2788.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2789.     } else {

  2790.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2791.     }

  2792.     if (dcdiff < 0) {

  2793.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2794.         return -1;

  2795.     }

  2796.     if (dcdiff) {

  2797.         if (dcdiff == 119 /* ESC index value */) {

  2798.             /* TODO: Optimize */

  2799.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  2800.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2801.             else                  dcdiff = get_bits(gb, 8);

  2802.         } else {

  2803.             if (mquant == 1)

  2804.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2805.             else if (mquant == 2)

  2806.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2807.         }

  2808.         if (get_bits1(gb))

  2809.             dcdiff = -dcdiff;

  2810.     }

  2811. 

  2812.     /* Prediction */

  2813.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2814.     *dc_val = dcdiff;

  2815. 

  2816.     /* Store the quantized DC coeff, used for prediction */

  2817.     if (n < 4) {

  2818.         block[0] = dcdiff * s->y_dc_scale;

  2819.     } else {

  2820.         block[0] = dcdiff * s->c_dc_scale;

  2821.     }

  2822. 

  2823.     //AC Decoding

  2824.     i = 1;

  2825. 

  2826.     /* check if AC is needed at all */

  2827.     if (!a_avail && !c_avail)

  2828.         use_pred = 0;

  2829.     ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2830.     ac_val2 = ac_val;

  2831. 

  2832.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  2833. 

  2834.     if (dc_pred_dir) // left

  2835.         ac_val -= 16;

  2836.     else // top

  2837.         ac_val -= 16 * s->block_wrap[n];

  2838. 

  2839.     q1 = s->current_picture.qscale_table[mb_pos];

  2840.     if ( dc_pred_dir && c_avail && mb_pos)

  2841.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2842.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  2843.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2844.     if ( dc_pred_dir && n == 1)

  2845.         q2 = q1;

  2846.     if (!dc_pred_dir && n == 2)

  2847.         q2 = q1;

  2848.     if (n == 3)

  2849.         q2 = q1;

  2850. 

  2851.     if (coded) {

  2852.         int last = 0, skip, value;

  2853.         const uint8_t *zz_table;

  2854.         int k;

  2855. 

  2856.         if (v->s.ac_pred) {

  2857.             if (!use_pred && v->fcm == ILACE_FRAME) {

  2858.                 zz_table = v->zzi_8x8;

  2859.             } else {

  2860.                 if (!dc_pred_dir) // top

  2861.                     zz_table = v->zz_8x8[2];

  2862.                 else // left

  2863.                     zz_table = v->zz_8x8[3];

  2864.             }

  2865.         } else {

  2866.             if (v->fcm != ILACE_FRAME)

  2867.                 zz_table = v->zz_8x8[1];

  2868.             else

  2869.                 zz_table = v->zzi_8x8;

  2870.         }

  2871. 

  2872.         while (!last) {

  2873.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2874.             i += skip;

  2875.             if (i > 63)

  2876.                 break;

  2877.             block[zz_table[i++]] = value;

  2878.         }

  2879. 

  2880.         /* apply AC prediction if needed */

  2881.         if (use_pred) {

  2882.             /* scale predictors if needed*/

  2883.             if (q2 && q1 != q2) {

  2884.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2885.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2886. 

  2887.                 if (q1 < 1)

  2888.                     return AVERROR_INVALIDDATA;

  2889.                 if (dc_pred_dir) { // left

  2890.                     for (k = 1; k < 8; k++)

  2891.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2892.                 } else { // top

  2893.                     for (k = 1; k < 8; k++)

  2894.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2895.                 }

  2896.             } else {

  2897.                 if (dc_pred_dir) { //left

  2898.                     for (k = 1; k < 8; k++)

  2899.                         block[k << v->left_blk_sh] += ac_val[k];

  2900.                 } else { //top

  2901.                     for (k = 1; k < 8; k++)

  2902.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  2903.                 }

  2904.             }

  2905.         }

  2906.         /* save AC coeffs for further prediction */

  2907.         for (k = 1; k < 8; k++) {

  2908.             ac_val2[k    ] = block[k << v->left_blk_sh];

  2909.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2910.         }

  2911. 

  2912.         /* scale AC coeffs */

  2913.         for (k = 1; k < 64; k++)

  2914.             if (block[k]) {

  2915.                 block[k] *= scale;

  2916.                 if (!v->pquantizer)

  2917.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2918.             }

  2919. 

  2920.         if (use_pred) i = 63;

  2921.     } else { // no AC coeffs

  2922.         int k;

  2923. 

  2924.         memset(ac_val2, 0, 16 * 2);

  2925.         if (dc_pred_dir) { // left

  2926.             if (use_pred) {

  2927.                 memcpy(ac_val2, ac_val, 8 * 2);

  2928.                 if (q2 && q1 != q2) {

  2929.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2930.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2931.                     if (q1 < 1)

  2932.                         return AVERROR_INVALIDDATA;

  2933.                     for (k = 1; k < 8; k++)

  2934.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2935.                 }

  2936.             }

  2937.         } else { // top

  2938.             if (use_pred) {

  2939.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2940.                 if (q2 && q1 != q2) {

  2941.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2942.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2943.                     if (q1 < 1)

  2944.                         return AVERROR_INVALIDDATA;

  2945.                     for (k = 1; k < 8; k++)

  2946.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2947.                 }

  2948.             }

  2949.         }

  2950. 

  2951.         /* apply AC prediction if needed */

  2952.         if (use_pred) {

  2953.             if (dc_pred_dir) { // left

  2954.                 for (k = 1; k < 8; k++) {

  2955.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  2956.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2957.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  2958.                 }

  2959.             } else { // top

  2960.                 for (k = 1; k < 8; k++) {

  2961.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  2962.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2963.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  2964.                 }

  2965.             }

  2966.             i = 63;

  2967.         }

  2968.     }

  2969.     s->block_last_index[n] = i;

  2970. 

  2971.     return 0;

  2972. }

  2973. 

  2974. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2975.  * @param v VC1Context

  2976.  * @param block block to decode

  2977.  * @param[in] n subblock index

  2978.  * @param coded are AC coeffs present or not

  2979.  * @param mquant block quantizer

  2980.  * @param codingset set of VLC to decode data

  2981.  */

  2982. static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,

  2983.                                   int coded, int mquant, int codingset)

  2984. {

  2985.     GetBitContext *gb = &v->s.gb;

  2986.     MpegEncContext *s = &v->s;

  2987.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2988.     int i;

  2989.     int16_t *dc_val = NULL;

  2990.     int16_t *ac_val, *ac_val2;

  2991.     int dcdiff;

  2992.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2993.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2994.     int use_pred = s->ac_pred;

  2995.     int scale;

  2996.     int q1, q2 = 0;

  2997. 

  2998.     s->dsp.clear_block(block);

  2999. 

  3000.     /* XXX: Guard against dumb values of mquant */

  3001.     mquant = (mquant < 1) ? 0 : ((mquant > 31) ? 31 : mquant);

  3002. 

  3003.     /* Set DC scale - y and c use the same */

  3004.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  3005.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  3006. 

  3007.     /* Get DC differential */

  3008.     if (n < 4) {

  3009.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3010.     } else {

  3011.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3012.     }

  3013.     if (dcdiff < 0) {

  3014.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  3015.         return -1;

  3016.     }

  3017.     if (dcdiff) {

  3018.         if (dcdiff == 119 /* ESC index value */) {

  3019.             /* TODO: Optimize */

  3020.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  3021.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  3022.             else                  dcdiff = get_bits(gb, 8);

  3023.         } else {

  3024.             if (mquant == 1)

  3025.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  3026.             else if (mquant == 2)

  3027.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  3028.         }

  3029.         if (get_bits1(gb))

  3030.             dcdiff = -dcdiff;

  3031.     }

  3032. 

  3033.     /* Prediction */

  3034.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  3035.     *dc_val = dcdiff;

  3036. 

  3037.     /* Store the quantized DC coeff, used for prediction */

  3038. 

  3039.     if (n < 4) {

  3040.         block[0] = dcdiff * s->y_dc_scale;

  3041.     } else {

  3042.         block[0] = dcdiff * s->c_dc_scale;

  3043.     }

  3044. 

  3045.     //AC Decoding

  3046.     i = 1;

  3047. 

  3048.     /* check if AC is needed at all and adjust direction if needed */

  3049.     if (!a_avail) dc_pred_dir = 1;

  3050.     if (!c_avail) dc_pred_dir = 0;

  3051.     if (!a_avail && !c_avail) use_pred = 0;

  3052.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  3053.     ac_val2 = ac_val;

  3054. 

  3055.     scale = mquant * 2 + v->halfpq;

  3056. 

  3057.     if (dc_pred_dir) //left

  3058.         ac_val -= 16;

  3059.     else //top

  3060.         ac_val -= 16 * s->block_wrap[n];

  3061. 

  3062.     q1 = s->current_picture.qscale_table[mb_pos];

  3063.     if (dc_pred_dir && c_avail && mb_pos)

  3064.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  3065.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  3066.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  3067.     if ( dc_pred_dir && n == 1)

  3068.         q2 = q1;

  3069.     if (!dc_pred_dir && n == 2)

  3070.         q2 = q1;

  3071.     if (n == 3) q2 = q1;

  3072. 

  3073.     if (coded) {

  3074.         int last = 0, skip, value;

  3075.         int k;

  3076. 

  3077.         while (!last) {

  3078.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  3079.             i += skip;

  3080.             if (i > 63)

  3081.                 break;

  3082.             if (v->fcm == PROGRESSIVE)

  3083.                 block[v->zz_8x8[0][i++]] = value;

  3084.             else {

  3085.                 if (use_pred && (v->fcm == ILACE_FRAME)) {

  3086.                     if (!dc_pred_dir) // top

  3087.                         block[v->zz_8x8[2][i++]] = value;

  3088.                     else // left

  3089.                         block[v->zz_8x8[3][i++]] = value;

  3090.                 } else {

  3091.                     block[v->zzi_8x8[i++]] = value;

  3092.                 }

  3093.             }

  3094.         }

  3095. 

  3096.         /* apply AC prediction if needed */

  3097.         if (use_pred) {

  3098.             /* scale predictors if needed*/

  3099.             if (q2 && q1 != q2) {

  3100.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3101.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3102. 

  3103.                 if (q1 < 1)

  3104.                     return AVERROR_INVALIDDATA;

  3105.                 if (dc_pred_dir) { // left

  3106.                     for (k = 1; k < 8; k++)

  3107.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3108.                 } else { //top

  3109.                     for (k = 1; k < 8; k++)

  3110.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3111.                 }

  3112.             } else {

  3113.                 if (dc_pred_dir) { // left

  3114.                     for (k = 1; k < 8; k++)

  3115.                         block[k << v->left_blk_sh] += ac_val[k];

  3116.                 } else { // top

  3117.                     for (k = 1; k < 8; k++)

  3118.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  3119.                 }

  3120.             }

  3121.         }

  3122.         /* save AC coeffs for further prediction */

  3123.         for (k = 1; k < 8; k++) {

  3124.             ac_val2[k    ] = block[k << v->left_blk_sh];

  3125.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  3126.         }

  3127. 

  3128.         /* scale AC coeffs */

  3129.         for (k = 1; k < 64; k++)

  3130.             if (block[k]) {

  3131.                 block[k] *= scale;

  3132.                 if (!v->pquantizer)

  3133.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3134.             }

  3135. 

  3136.         if (use_pred) i = 63;

  3137.     } else { // no AC coeffs

  3138.         int k;

  3139. 

  3140.         memset(ac_val2, 0, 16 * 2);

  3141.         if (dc_pred_dir) { // left

  3142.             if (use_pred) {

  3143.                 memcpy(ac_val2, ac_val, 8 * 2);

  3144.                 if (q2 && q1 != q2) {

  3145.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3146.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3147.                     if (q1 < 1)

  3148.                         return AVERROR_INVALIDDATA;

  3149.                     for (k = 1; k < 8; k++)

  3150.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3151.                 }

  3152.             }

  3153.         } else { // top

  3154.             if (use_pred) {

  3155.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3156.                 if (q2 && q1 != q2) {

  3157.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3158.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3159.                     if (q1 < 1)

  3160.                         return AVERROR_INVALIDDATA;

  3161.                     for (k = 1; k < 8; k++)

  3162.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3163.                 }

  3164.             }

  3165.         }

  3166. 

  3167.         /* apply AC prediction if needed */

  3168.         if (use_pred) {

  3169.             if (dc_pred_dir) { // left

  3170.                 for (k = 1; k < 8; k++) {

  3171.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  3172.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  3173.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  3174.                 }

  3175.             } else { // top

  3176.                 for (k = 1; k < 8; k++) {

  3177.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  3178.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  3179.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  3180.                 }

  3181.             }

  3182.             i = 63;

  3183.         }

  3184.     }

  3185.     s->block_last_index[n] = i;

  3186. 

  3187.     return 0;

  3188. }

  3189. 

  3190. /** Decode P block

  3191.  */

  3192. static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,

  3193.                               int mquant, int ttmb, int first_block,

  3194.                               uint8_t *dst, int linesize, int skip_block,

  3195.                               int *ttmb_out)

  3196. {

  3197.     MpegEncContext *s = &v->s;

  3198.     GetBitContext *gb = &s->gb;

  3199.     int i, j;

  3200.     int subblkpat = 0;

  3201.     int scale, off, idx, last, skip, value;

  3202.     int ttblk = ttmb & 7;

  3203.     int pat = 0;

  3204. 

  3205.     s->dsp.clear_block(block);

  3206. 

  3207.     if (ttmb == -1) {

  3208.         ttblk = ff_vc1_ttblk_to_tt[v->tt_index][get_vlc2(gb, ff_vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  3209.     }

  3210.     if (ttblk == TT_4X4) {

  3211.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  3212.     }

  3213.     if ((ttblk != TT_8X8 && ttblk != TT_4X4)

  3214.         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))

  3215.             || (!v->res_rtm_flag && !first_block))) {

  3216.         subblkpat = decode012(gb);

  3217.         if (subblkpat)

  3218.             subblkpat ^= 3; // swap decoded pattern bits

  3219.         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)

  3220.             ttblk = TT_8X4;

  3221.         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)

  3222.             ttblk = TT_4X8;

  3223.     }

  3224.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  3225. 

  3226.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  3227.     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  3228.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  3229.         ttblk     = TT_8X4;

  3230.     }

  3231.     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  3232.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  3233.         ttblk     = TT_4X8;

  3234.     }

  3235.     switch (ttblk) {

  3236.     case TT_8X8:

  3237.         pat  = 0xF;

  3238.         i    = 0;

  3239.         last = 0;

  3240.         while (!last) {

  3241.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3242.             i += skip;

  3243.             if (i > 63)

  3244.                 break;

  3245.             if (!v->fcm)

  3246.                 idx = v->zz_8x8[0][i++];

  3247.             else

  3248.                 idx = v->zzi_8x8[i++];

  3249.             block[idx] = value * scale;

  3250.             if (!v->pquantizer)

  3251.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3252.         }

  3253.         if (!skip_block) {

  3254.             if (i == 1)

  3255.                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);

  3256.             else {

  3257.                 v->vc1dsp.vc1_inv_trans_8x8(block);

  3258.                 s->dsp.add_pixels_clamped(block, dst, linesize);

  3259.             }

  3260.         }

  3261.         break;

  3262.     case TT_4X4:

  3263.         pat = ~subblkpat & 0xF;

  3264.         for (j = 0; j < 4; j++) {

  3265.             last = subblkpat & (1 << (3 - j));

  3266.             i    = 0;

  3267.             off  = (j & 1) * 4 + (j & 2) * 16;

  3268.             while (!last) {

  3269.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3270.                 i += skip;

  3271.                 if (i > 15)

  3272.                     break;

  3273.                 if (!v->fcm)

  3274.                     idx = ff_vc1_simple_progressive_4x4_zz[i++];

  3275.                 else

  3276.                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];

  3277.                 block[idx + off] = value * scale;

  3278.                 if (!v->pquantizer)

  3279.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3280.             }

  3281.             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {

  3282.                 if (i == 1)

  3283.                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);

  3284.                 else

  3285.                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);

  3286.             }

  3287.         }

  3288.         break;

  3289.     case TT_8X4:

  3290.         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;

  3291.         for (j = 0; j < 2; j++) {

  3292.             last = subblkpat & (1 << (1 - j));

  3293.             i    = 0;

  3294.             off  = j * 32;

  3295.             while (!last) {

  3296.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3297.                 i += skip;

  3298.                 if (i > 31)

  3299.                     break;

  3300.                 if (!v->fcm)

  3301.                     idx = v->zz_8x4[i++] + off;

  3302.                 else

  3303.                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;

  3304.                 block[idx] = value * scale;

  3305.                 if (!v->pquantizer)

  3306.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3307.             }

  3308.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3309.                 if (i == 1)

  3310.                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);

  3311.                 else

  3312.                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);

  3313.             }

  3314.         }

  3315.         break;

  3316.     case TT_4X8:

  3317.         pat = ~(subblkpat * 5) & 0xF;

  3318.         for (j = 0; j < 2; j++) {

  3319.             last = subblkpat & (1 << (1 - j));

  3320.             i    = 0;

  3321.             off  = j * 4;

  3322.             while (!last) {

  3323.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3324.                 i += skip;

  3325.                 if (i > 31)

  3326.                     break;

  3327.                 if (!v->fcm)

  3328.                     idx = v->zz_4x8[i++] + off;

  3329.                 else

  3330.                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;

  3331.                 block[idx] = value * scale;

  3332.                 if (!v->pquantizer)

  3333.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3334.             }

  3335.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3336.                 if (i == 1)

  3337.                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);

  3338.                 else

  3339.                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  3340.             }

  3341.         }

  3342.         break;

  3343.     }

  3344.     if (ttmb_out)

  3345.         *ttmb_out |= ttblk << (n * 4);

  3346.     return pat;

  3347. }

  3348. 

  3349. /** @} */ // Macroblock group

  3350. 

  3351. static const int size_table  [6] = { 0, 2, 3, 4,  5,  8 };

  3352. static const int offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3353. 

  3354. static av_always_inline void vc1_apply_p_v_loop_filter(VC1Context *v, int block_num)

  3355. {

  3356.     MpegEncContext *s  = &v->s;

  3357.     int mb_cbp         = v->cbp[s->mb_x - s->mb_stride],

  3358.         block_cbp      = mb_cbp      >> (block_num * 4), bottom_cbp,

  3359.         mb_is_intra    = v->is_intra[s->mb_x - s->mb_stride],

  3360.         block_is_intra = mb_is_intra >> (block_num * 4), bottom_is_intra;

  3361.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3362.     uint8_t *dst;

  3363. 

  3364.     if (block_num > 3) {

  3365.         dst      = s->dest[block_num - 3];

  3366.     } else {

  3367.         dst      = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 8) * linesize;

  3368.     }

  3369.     if (s->mb_y != s->end_mb_y || block_num < 2) {

  3370.         int16_t (*mv)[2];

  3371.         int mv_stride;

  3372. 

  3373.         if (block_num > 3) {

  3374.             bottom_cbp      = v->cbp[s->mb_x]      >> (block_num * 4);

  3375.             bottom_is_intra = v->is_intra[s->mb_x] >> (block_num * 4);

  3376.             mv              = &v->luma_mv[s->mb_x - s->mb_stride];

  3377.             mv_stride       = s->mb_stride;

  3378.         } else {

  3379.             bottom_cbp      = (block_num < 2) ? (mb_cbp               >> ((block_num + 2) * 4))

  3380.                                               : (v->cbp[s->mb_x]      >> ((block_num - 2) * 4));

  3381.             bottom_is_intra = (block_num < 2) ? (mb_is_intra          >> ((block_num + 2) * 4))

  3382.                                               : (v->is_intra[s->mb_x] >> ((block_num - 2) * 4));

  3383.             mv_stride       = s->b8_stride;

  3384.             mv              = &s->current_picture.motion_val[0][s->block_index[block_num] - 2 * mv_stride];

  3385.         }

  3386. 

  3387.         if (bottom_is_intra & 1 || block_is_intra & 1 ||

  3388.             mv[0][0] != mv[mv_stride][0] || mv[0][1] != mv[mv_stride][1]) {

  3389.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3390.         } else {

  3391.             idx = ((bottom_cbp >> 2) | block_cbp) & 3;

  3392.             if (idx == 3) {

  3393.                 v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3394.             } else if (idx) {

  3395.                 if (idx == 1)

  3396.                     v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3397.                 else

  3398.                     v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3399.             }

  3400.         }

  3401.     }

  3402. 

  3403.     dst -= 4 * linesize;

  3404.     ttblk = (v->ttblk[s->mb_x - s->mb_stride] >> (block_num * 4)) & 0xF;

  3405.     if (ttblk == TT_4X4 || ttblk == TT_8X4) {

  3406.         idx = (block_cbp | (block_cbp >> 2)) & 3;

  3407.         if (idx == 3) {

  3408.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3409.         } else if (idx) {

  3410.             if (idx == 1)

  3411.                 v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3412.             else

  3413.                 v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3414.         }

  3415.     }

  3416. }

  3417. 

  3418. static av_always_inline void vc1_apply_p_h_loop_filter(VC1Context *v, int block_num)

  3419. {

  3420.     MpegEncContext *s  = &v->s;

  3421.     int mb_cbp         = v->cbp[s->mb_x - 1 - s->mb_stride],

  3422.         block_cbp      = mb_cbp      >> (block_num * 4), right_cbp,

  3423.         mb_is_intra    = v->is_intra[s->mb_x - 1 - s->mb_stride],

  3424.         block_is_intra = mb_is_intra >> (block_num * 4), right_is_intra;

  3425.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3426.     uint8_t *dst;

  3427. 

  3428.     if (block_num > 3) {

  3429.         dst = s->dest[block_num - 3] - 8 * linesize;

  3430.     } else {

  3431.         dst = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 16) * linesize - 8;

  3432.     }

  3433. 

  3434.     if (s->mb_x != s->mb_width || !(block_num & 5)) {

  3435.         int16_t (*mv)[2];

  3436. 

  3437.         if (block_num > 3) {

  3438.             right_cbp      = v->cbp[s->mb_x - s->mb_stride] >> (block_num * 4);

  3439.             right_is_intra = v->is_intra[s->mb_x - s->mb_stride] >> (block_num * 4);

  3440.             mv             = &v->luma_mv[s->mb_x - s->mb_stride - 1];

  3441.         } else {

  3442.             right_cbp      = (block_num & 1) ? (v->cbp[s->mb_x - s->mb_stride]      >> ((block_num - 1) * 4))

  3443.                                              : (mb_cbp                              >> ((block_num + 1) * 4));

  3444.             right_is_intra = (block_num & 1) ? (v->is_intra[s->mb_x - s->mb_stride] >> ((block_num - 1) * 4))

  3445.                                              : (mb_is_intra                         >> ((block_num + 1) * 4));

  3446.             mv             = &s->current_picture.motion_val[0][s->block_index[block_num] - s->b8_stride * 2 - 2];

  3447.         }

  3448.         if (block_is_intra & 1 || right_is_intra & 1 || mv[0][0] != mv[1][0] || mv[0][1] != mv[1][1]) {

  3449.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3450.         } else {

  3451.             idx = ((right_cbp >> 1) | block_cbp) & 5; // FIXME check

  3452.             if (idx == 5) {

  3453.                 v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3454.             } else if (idx) {

  3455.                 if (idx == 1)

  3456.                     v->vc1dsp.vc1_h_loop_filter4(dst + 4 * linesize, linesize, v->pq);

  3457.                 else

  3458.                     v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3459.             }

  3460.         }

  3461.     }

  3462. 

  3463.     dst -= 4;

  3464.     ttblk = (v->ttblk[s->mb_x - s->mb_stride - 1] >> (block_num * 4)) & 0xf;

  3465.     if (ttblk == TT_4X4 || ttblk == TT_4X8) {

  3466.         idx = (block_cbp | (block_cbp >> 1)) & 5;

  3467.         if (idx == 5) {

  3468.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3469.         } else if (idx) {

  3470.             if (idx == 1)

  3471.                 v->vc1dsp.vc1_h_loop_filter4(dst + linesize * 4, linesize, v->pq);

  3472.             else

  3473.                 v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3474.         }

  3475.     }

  3476. }

  3477. 

  3478. static void vc1_apply_p_loop_filter(VC1Context *v)

  3479. {

  3480.     MpegEncContext *s = &v->s;

  3481.     int i;

  3482. 

  3483.     for (i = 0; i < 6; i++) {

  3484.         vc1_apply_p_v_loop_filter(v, i);

  3485.     }

  3486. 

  3487.     /* V always precedes H, therefore we run H one MB before V;

  3488.      * at the end of a row, we catch up to complete the row */

  3489.     if (s->mb_x) {

  3490.         for (i = 0; i < 6; i++) {

  3491.             vc1_apply_p_h_loop_filter(v, i);

  3492.         }

  3493.         if (s->mb_x == s->mb_width - 1) {

  3494.             s->mb_x++;

  3495.             ff_update_block_index(s);

  3496.             for (i = 0; i < 6; i++) {

  3497.                 vc1_apply_p_h_loop_filter(v, i);

  3498.             }

  3499.         }

  3500.     }

  3501. }

  3502. 

  3503. /** Decode one P-frame MB

  3504.  */

  3505. static int vc1_decode_p_mb(VC1Context *v)

  3506. {

  3507.     MpegEncContext *s = &v->s;

  3508.     GetBitContext *gb = &s->gb;

  3509.     int i, j;

  3510.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3511.     int cbp; /* cbp decoding stuff */

  3512.     int mqdiff, mquant; /* MB quantization */

  3513.     int ttmb = v->ttfrm; /* MB Transform type */

  3514. 

  3515.     int mb_has_coeffs = 1; /* last_flag */

  3516.     int dmv_x, dmv_y; /* Differential MV components */

  3517.     int index, index1; /* LUT indexes */

  3518.     int val, sign; /* temp values */

  3519.     int first_block = 1;

  3520.     int dst_idx, off;

  3521.     int skipped, fourmv;

  3522.     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;

  3523. 

  3524.     mquant = v->pq; /* lossy initialization */

  3525. 

  3526.     if (v->mv_type_is_raw)

  3527.         fourmv = get_bits1(gb);

  3528.     else

  3529.         fourmv = v->mv_type_mb_plane[mb_pos];

  3530.     if (v->skip_is_raw)

  3531.         skipped = get_bits1(gb);

  3532.     else

  3533.         skipped = v->s.mbskip_table[mb_pos];

  3534. 

  3535.     if (!fourmv) { /* 1MV mode */

  3536.         if (!skipped) {

  3537.             GET_MVDATA(dmv_x, dmv_y);

  3538. 

  3539.             if (s->mb_intra) {

  3540.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3541.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3542.             }

  3543.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3544.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3545. 

  3546.             /* FIXME Set DC val for inter block ? */

  3547.             if (s->mb_intra && !mb_has_coeffs) {

  3548.                 GET_MQUANT();

  3549.                 s->ac_pred = get_bits1(gb);

  3550.                 cbp        = 0;

  3551.             } else if (mb_has_coeffs) {

  3552.                 if (s->mb_intra)

  3553.                     s->ac_pred = get_bits1(gb);

  3554.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3555.                 GET_MQUANT();

  3556.             } else {

  3557.                 mquant = v->pq;

  3558.                 cbp    = 0;

  3559.             }

  3560.             s->current_picture.qscale_table[mb_pos] = mquant;

  3561. 

  3562.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3563.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3564.                                 VC1_TTMB_VLC_BITS, 2);

  3565.             if (!s->mb_intra) vc1_mc_1mv(v, 0);

  3566.             dst_idx = 0;

  3567.             for (i = 0; i < 6; i++) {

  3568.                 s->dc_val[0][s->block_index[i]] = 0;

  3569.                 dst_idx += i >> 2;

  3570.                 val = ((cbp >> (5 - i)) & 1);

  3571.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3572.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3573.                 if (s->mb_intra) {

  3574.                     /* check if prediction blocks A and C are available */

  3575.                     v->a_avail = v->c_avail = 0;

  3576.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3577.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3578.                     if (i == 1 || i == 3 || s->mb_x)

  3579.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3580. 

  3581.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3582.                                            (i & 4) ? v->codingset2 : v->codingset);

  3583.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3584.                         continue;

  3585.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3586.                     if (v->rangeredfrm)

  3587.                         for (j = 0; j < 64; j++)

  3588.                             s->block[i][j] <<= 1;

  3589.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3590.                     if (v->pq >= 9 && v->overlap) {

  3591.                         if (v->c_avail)

  3592.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3593.                         if (v->a_avail)

  3594.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3595.                     }

  3596.                     block_cbp   |= 0xF << (i << 2);

  3597.                     block_intra |= 1 << i;

  3598.                 } else if (val) {

  3599.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block,

  3600.                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,

  3601.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3602.                     block_cbp |= pat << (i << 2);

  3603.                     if (!v->ttmbf && ttmb < 8)

  3604.                         ttmb = -1;

  3605.                     first_block = 0;

  3606.                 }

  3607.             }

  3608.         } else { // skipped

  3609.             s->mb_intra = 0;

  3610.             for (i = 0; i < 6; i++) {

  3611.                 v->mb_type[0][s->block_index[i]] = 0;

  3612.                 s->dc_val[0][s->block_index[i]]  = 0;

  3613.             }

  3614.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3615.             s->current_picture.qscale_table[mb_pos] = 0;

  3616.             vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3617.             vc1_mc_1mv(v, 0);

  3618.         }

  3619.     } else { // 4MV mode

  3620.         if (!skipped /* unskipped MB */) {

  3621.             int intra_count = 0, coded_inter = 0;

  3622.             int is_intra[6], is_coded[6];

  3623.             /* Get CBPCY */

  3624.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3625.             for (i = 0; i < 6; i++) {

  3626.                 val = ((cbp >> (5 - i)) & 1);

  3627.                 s->dc_val[0][s->block_index[i]] = 0;

  3628.                 s->mb_intra                     = 0;

  3629.                 if (i < 4) {

  3630.                     dmv_x = dmv_y = 0;

  3631.                     s->mb_intra   = 0;

  3632.                     mb_has_coeffs = 0;

  3633.                     if (val) {

  3634.                         GET_MVDATA(dmv_x, dmv_y);

  3635.                     }

  3636.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3637.                     if (!s->mb_intra)

  3638.                         vc1_mc_4mv_luma(v, i, 0, 0);

  3639.                     intra_count += s->mb_intra;

  3640.                     is_intra[i]  = s->mb_intra;

  3641.                     is_coded[i]  = mb_has_coeffs;

  3642.                 }

  3643.                 if (i & 4) {

  3644.                     is_intra[i] = (intra_count >= 3);

  3645.                     is_coded[i] = val;

  3646.                 }

  3647.                 if (i == 4)

  3648.                     vc1_mc_4mv_chroma(v, 0);

  3649.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3650.                 if (!coded_inter)

  3651.                     coded_inter = !is_intra[i] & is_coded[i];

  3652.             }

  3653.             // if there are no coded blocks then don't do anything more

  3654.             dst_idx = 0;

  3655.             if (!intra_count && !coded_inter)

  3656.                 goto end;

  3657.             GET_MQUANT();

  3658.             s->current_picture.qscale_table[mb_pos] = mquant;

  3659.             /* test if block is intra and has pred */

  3660.             {

  3661.                 int intrapred = 0;

  3662.                 for (i = 0; i < 6; i++)

  3663.                     if (is_intra[i]) {

  3664.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3665.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3666.                             intrapred = 1;

  3667.                             break;

  3668.                         }

  3669.                     }

  3670.                 if (intrapred)

  3671.                     s->ac_pred = get_bits1(gb);

  3672.                 else

  3673.                     s->ac_pred = 0;

  3674.             }

  3675.             if (!v->ttmbf && coded_inter)

  3676.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3677.             for (i = 0; i < 6; i++) {

  3678.                 dst_idx    += i >> 2;

  3679.                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3680.                 s->mb_intra = is_intra[i];

  3681.                 if (is_intra[i]) {

  3682.                     /* check if prediction blocks A and C are available */

  3683.                     v->a_avail = v->c_avail = 0;

  3684.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3685.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3686.                     if (i == 1 || i == 3 || s->mb_x)

  3687.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3688. 

  3689.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant,

  3690.                                            (i & 4) ? v->codingset2 : v->codingset);

  3691.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3692.                         continue;

  3693.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3694.                     if (v->rangeredfrm)

  3695.                         for (j = 0; j < 64; j++)

  3696.                             s->block[i][j] <<= 1;

  3697.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off,

  3698.                                                      (i & 4) ? s->uvlinesize : s->linesize);

  3699.                     if (v->pq >= 9 && v->overlap) {

  3700.                         if (v->c_avail)

  3701.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3702.                         if (v->a_avail)

  3703.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3704.                     }

  3705.                     block_cbp   |= 0xF << (i << 2);

  3706.                     block_intra |= 1 << i;

  3707.                 } else if (is_coded[i]) {

  3708.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3709.                                              first_block, s->dest[dst_idx] + off,

  3710.                                              (i & 4) ? s->uvlinesize : s->linesize,

  3711.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  3712.                                              &block_tt);

  3713.                     block_cbp |= pat << (i << 2);

  3714.                     if (!v->ttmbf && ttmb < 8)

  3715.                         ttmb = -1;

  3716.                     first_block = 0;

  3717.                 }

  3718.             }

  3719.         } else { // skipped MB

  3720.             s->mb_intra                               = 0;

  3721.             s->current_picture.qscale_table[mb_pos] = 0;

  3722.             for (i = 0; i < 6; i++) {

  3723.                 v->mb_type[0][s->block_index[i]] = 0;

  3724.                 s->dc_val[0][s->block_index[i]]  = 0;

  3725.             }

  3726.             for (i = 0; i < 4; i++) {

  3727.                 vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3728.                 vc1_mc_4mv_luma(v, i, 0, 0);

  3729.             }

  3730.             vc1_mc_4mv_chroma(v, 0);

  3731.             s->current_picture.qscale_table[mb_pos] = 0;

  3732.         }

  3733.     }

  3734. end:

  3735.     v->cbp[s->mb_x]      = block_cbp;

  3736.     v->ttblk[s->mb_x]    = block_tt;

  3737.     v->is_intra[s->mb_x] = block_intra;

  3738. 

  3739.     return 0;

  3740. }

  3741. 

  3742. /* Decode one macroblock in an interlaced frame p picture */

  3743. 

  3744. static int vc1_decode_p_mb_intfr(VC1Context *v)

  3745. {

  3746.     MpegEncContext *s = &v->s;

  3747.     GetBitContext *gb = &s->gb;

  3748.     int i;

  3749.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3750.     int cbp = 0; /* cbp decoding stuff */

  3751.     int mqdiff, mquant; /* MB quantization */

  3752.     int ttmb = v->ttfrm; /* MB Transform type */

  3753. 

  3754.     int mb_has_coeffs = 1; /* last_flag */

  3755.     int dmv_x, dmv_y; /* Differential MV components */

  3756.     int val; /* temp value */

  3757.     int first_block = 1;

  3758.     int dst_idx, off;

  3759.     int skipped, fourmv = 0, twomv = 0;

  3760.     int block_cbp = 0, pat, block_tt = 0;

  3761.     int idx_mbmode = 0, mvbp;

  3762.     int stride_y, fieldtx;

  3763. 

  3764.     mquant = v->pq; /* Lossy initialization */

  3765. 

  3766.     if (v->skip_is_raw)

  3767.         skipped = get_bits1(gb);

  3768.     else

  3769.         skipped = v->s.mbskip_table[mb_pos];

  3770.     if (!skipped) {

  3771.         if (v->fourmvswitch)

  3772.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done

  3773.         else

  3774.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line

  3775.         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {

  3776.         /* store the motion vector type in a flag (useful later) */

  3777.         case MV_PMODE_INTFR_4MV:

  3778.             fourmv = 1;

  3779.             v->blk_mv_type[s->block_index[0]] = 0;

  3780.             v->blk_mv_type[s->block_index[1]] = 0;

  3781.             v->blk_mv_type[s->block_index[2]] = 0;

  3782.             v->blk_mv_type[s->block_index[3]] = 0;

  3783.             break;

  3784.         case MV_PMODE_INTFR_4MV_FIELD:

  3785.             fourmv = 1;

  3786.             v->blk_mv_type[s->block_index[0]] = 1;

  3787.             v->blk_mv_type[s->block_index[1]] = 1;

  3788.             v->blk_mv_type[s->block_index[2]] = 1;

  3789.             v->blk_mv_type[s->block_index[3]] = 1;

  3790.             break;

  3791.         case MV_PMODE_INTFR_2MV_FIELD:

  3792.             twomv = 1;

  3793.             v->blk_mv_type[s->block_index[0]] = 1;

  3794.             v->blk_mv_type[s->block_index[1]] = 1;

  3795.             v->blk_mv_type[s->block_index[2]] = 1;

  3796.             v->blk_mv_type[s->block_index[3]] = 1;

  3797.             break;

  3798.         case MV_PMODE_INTFR_1MV:

  3799.             v->blk_mv_type[s->block_index[0]] = 0;

  3800.             v->blk_mv_type[s->block_index[1]] = 0;

  3801.             v->blk_mv_type[s->block_index[2]] = 0;

  3802.             v->blk_mv_type[s->block_index[3]] = 0;

  3803.             break;

  3804.         }

  3805.         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  3806.             for (i = 0; i < 4; i++) {

  3807.                 s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  3808.                 s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  3809.             }

  3810.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  3811.             s->mb_intra = v->is_intra[s->mb_x] = 1;

  3812.             for (i = 0; i < 6; i++)

  3813.                 v->mb_type[0][s->block_index[i]] = 1;

  3814.             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  3815.             mb_has_coeffs = get_bits1(gb);

  3816.             if (mb_has_coeffs)

  3817.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3818.             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  3819.             GET_MQUANT();

  3820.             s->current_picture.qscale_table[mb_pos] = mquant;

  3821.             /* Set DC scale - y and c use the same (not sure if necessary here) */

  3822.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3823.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3824.             dst_idx = 0;

  3825.             for (i = 0; i < 6; i++) {

  3826.                 s->dc_val[0][s->block_index[i]] = 0;

  3827.                 dst_idx += i >> 2;

  3828.                 val = ((cbp >> (5 - i)) & 1);

  3829.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3830.                 v->a_avail = v->c_avail = 0;

  3831.                 if (i == 2 || i == 3 || !s->first_slice_line)

  3832.                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3833.                 if (i == 1 || i == 3 || s->mb_x)

  3834.                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3835. 

  3836.                 vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3837.                                        (i & 4) ? v->codingset2 : v->codingset);

  3838.                 if ((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3839.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3840.                 if (i < 4) {

  3841.                     stride_y = s->linesize << fieldtx;

  3842.                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  3843.                 } else {

  3844.                     stride_y = s->uvlinesize;

  3845.                     off = 0;

  3846.                 }

  3847.                 s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, stride_y);

  3848.                 //TODO: loop filter

  3849.             }

  3850. 

  3851.         } else { // inter MB

  3852.             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];

  3853.             if (mb_has_coeffs)

  3854.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3855.             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  3856.                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  3857.             } else {

  3858.                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)

  3859.                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {

  3860.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  3861.                 }

  3862.             }

  3863.             s->mb_intra = v->is_intra[s->mb_x] = 0;

  3864.             for (i = 0; i < 6; i++)

  3865.                 v->mb_type[0][s->block_index[i]] = 0;

  3866.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];

  3867.             /* for all motion vector read MVDATA and motion compensate each block */

  3868.             dst_idx = 0;

  3869.             if (fourmv) {

  3870.                 mvbp = v->fourmvbp;

  3871.                 for (i = 0; i < 6; i++) {

  3872.                     if (i < 4) {

  3873.                         dmv_x = dmv_y = 0;

  3874.                         val   = ((mvbp >> (3 - i)) & 1);

  3875.                         if (val) {

  3876.                             get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3877.                         }

  3878.                         vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0);

  3879.                         vc1_mc_4mv_luma(v, i, 0, 0);

  3880.                     } else if (i == 4) {

  3881.                         vc1_mc_4mv_chroma4(v);

  3882.                     }

  3883.                 }

  3884.             } else if (twomv) {

  3885.                 mvbp  = v->twomvbp;

  3886.                 dmv_x = dmv_y = 0;

  3887.                 if (mvbp & 2) {

  3888.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3889.                 }

  3890.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  3891.                 vc1_mc_4mv_luma(v, 0, 0, 0);

  3892.                 vc1_mc_4mv_luma(v, 1, 0, 0);

  3893.                 dmv_x = dmv_y = 0;

  3894.                 if (mvbp & 1) {

  3895.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3896.                 }

  3897.                 vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  3898.                 vc1_mc_4mv_luma(v, 2, 0, 0);

  3899.                 vc1_mc_4mv_luma(v, 3, 0, 0);

  3900.                 vc1_mc_4mv_chroma4(v);

  3901.             } else {

  3902.                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];

  3903.                 dmv_x = dmv_y = 0;

  3904.                 if (mvbp) {

  3905.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3906.                 }

  3907.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  3908.                 vc1_mc_1mv(v, 0);

  3909.             }

  3910.             if (cbp)

  3911.                 GET_MQUANT();  // p. 227

  3912.             s->current_picture.qscale_table[mb_pos] = mquant;

  3913.             if (!v->ttmbf && cbp)

  3914.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3915.             for (i = 0; i < 6; i++) {

  3916.                 s->dc_val[0][s->block_index[i]] = 0;

  3917.                 dst_idx += i >> 2;

  3918.                 val = ((cbp >> (5 - i)) & 1);

  3919.                 if (!fieldtx)

  3920.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3921.                 else

  3922.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  3923.                 if (val) {

  3924.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3925.                                              first_block, s->dest[dst_idx] + off,

  3926.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  3927.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3928.                     block_cbp |= pat << (i << 2);

  3929.                     if (!v->ttmbf && ttmb < 8)

  3930.                         ttmb = -1;

  3931.                     first_block = 0;

  3932.                 }

  3933.             }

  3934.         }

  3935.     } else { // skipped

  3936.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  3937.         for (i = 0; i < 6; i++) {

  3938.             v->mb_type[0][s->block_index[i]] = 0;

  3939.             s->dc_val[0][s->block_index[i]] = 0;

  3940.         }

  3941.         s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3942.         s->current_picture.qscale_table[mb_pos] = 0;

  3943.         v->blk_mv_type[s->block_index[0]] = 0;

  3944.         v->blk_mv_type[s->block_index[1]] = 0;

  3945.         v->blk_mv_type[s->block_index[2]] = 0;

  3946.         v->blk_mv_type[s->block_index[3]] = 0;

  3947.         vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  3948.         vc1_mc_1mv(v, 0);

  3949.     }

  3950.     if (s->mb_x == s->mb_width - 1)

  3951.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);

  3952.     return 0;

  3953. }

  3954. 

  3955. static int vc1_decode_p_mb_intfi(VC1Context *v)

  3956. {

  3957.     MpegEncContext *s = &v->s;

  3958.     GetBitContext *gb = &s->gb;

  3959.     int i;

  3960.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3961.     int cbp = 0; /* cbp decoding stuff */

  3962.     int mqdiff, mquant; /* MB quantization */

  3963.     int ttmb = v->ttfrm; /* MB Transform type */

  3964. 

  3965.     int mb_has_coeffs = 1; /* last_flag */

  3966.     int dmv_x, dmv_y; /* Differential MV components */

  3967.     int val; /* temp values */

  3968.     int first_block = 1;

  3969.     int dst_idx, off;

  3970.     int pred_flag = 0;

  3971.     int block_cbp = 0, pat, block_tt = 0;

  3972.     int idx_mbmode = 0;

  3973. 

  3974.     mquant = v->pq; /* Lossy initialization */

  3975. 

  3976.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  3977.     if (idx_mbmode <= 1) { // intra MB

  3978.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  3979.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  3980.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  3981.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;

  3982.         GET_MQUANT();

  3983.         s->current_picture.qscale_table[mb_pos] = mquant;

  3984.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  3985.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  3986.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  3987.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  3988.         mb_has_coeffs = idx_mbmode & 1;

  3989.         if (mb_has_coeffs)

  3990.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  3991.         dst_idx = 0;

  3992.         for (i = 0; i < 6; i++) {

  3993.             s->dc_val[0][s->block_index[i]]  = 0;

  3994.             v->mb_type[0][s->block_index[i]] = 1;

  3995.             dst_idx += i >> 2;

  3996.             val = ((cbp >> (5 - i)) & 1);

  3997.             v->a_avail = v->c_avail = 0;

  3998.             if (i == 2 || i == 3 || !s->first_slice_line)

  3999.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4000.             if (i == 1 || i == 3 || s->mb_x)

  4001.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4002. 

  4003.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4004.                                    (i & 4) ? v->codingset2 : v->codingset);

  4005.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4006.                 continue;

  4007.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4008.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4009.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  4010.             // TODO: loop filter

  4011.         }

  4012.     } else {

  4013.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4014.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  4015.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  4016.         if (idx_mbmode <= 5) { // 1-MV

  4017.             dmv_x = dmv_y = pred_flag = 0;

  4018.             if (idx_mbmode & 1) {

  4019.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  4020.             }

  4021.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  4022.             vc1_mc_1mv(v, 0);

  4023.             mb_has_coeffs = !(idx_mbmode & 2);

  4024.         } else { // 4-MV

  4025.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4026.             for (i = 0; i < 6; i++) {

  4027.                 if (i < 4) {

  4028.                     dmv_x = dmv_y = pred_flag = 0;

  4029.                     val   = ((v->fourmvbp >> (3 - i)) & 1);

  4030.                     if (val) {

  4031.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  4032.                     }

  4033.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  4034.                     vc1_mc_4mv_luma(v, i, 0, 0);

  4035.                 } else if (i == 4)

  4036.                     vc1_mc_4mv_chroma(v, 0);

  4037.             }

  4038.             mb_has_coeffs = idx_mbmode & 1;

  4039.         }

  4040.         if (mb_has_coeffs)

  4041.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4042.         if (cbp) {

  4043.             GET_MQUANT();

  4044.         }

  4045.         s->current_picture.qscale_table[mb_pos] = mquant;

  4046.         if (!v->ttmbf && cbp) {

  4047.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4048.         }

  4049.         dst_idx = 0;

  4050.         for (i = 0; i < 6; i++) {

  4051.             s->dc_val[0][s->block_index[i]] = 0;

  4052.             dst_idx += i >> 2;

  4053.             val = ((cbp >> (5 - i)) & 1);

  4054.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  4055.             if (val) {

  4056.                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4057.                                          first_block, s->dest[dst_idx] + off,

  4058.                                          (i & 4) ? s->uvlinesize : s->linesize,

  4059.                                          (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  4060.                                          &block_tt);

  4061.                 block_cbp |= pat << (i << 2);

  4062.                 if (!v->ttmbf && ttmb < 8) ttmb = -1;

  4063.                 first_block = 0;

  4064.             }

  4065.         }

  4066.     }

  4067.     if (s->mb_x == s->mb_width - 1)

  4068.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4069.     return 0;

  4070. }

  4071. 

  4072. /** Decode one B-frame MB (in Main profile)

  4073.  */

  4074. static void vc1_decode_b_mb(VC1Context *v)

  4075. {

  4076.     MpegEncContext *s = &v->s;

  4077.     GetBitContext *gb = &s->gb;

  4078.     int i, j;

  4079.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4080.     int cbp = 0; /* cbp decoding stuff */

  4081.     int mqdiff, mquant; /* MB quantization */

  4082.     int ttmb = v->ttfrm; /* MB Transform type */

  4083.     int mb_has_coeffs = 0; /* last_flag */

  4084.     int index, index1; /* LUT indexes */

  4085.     int val, sign; /* temp values */

  4086.     int first_block = 1;

  4087.     int dst_idx, off;

  4088.     int skipped, direct;

  4089.     int dmv_x[2], dmv_y[2];

  4090.     int bmvtype = BMV_TYPE_BACKWARD;

  4091. 

  4092.     mquant      = v->pq; /* lossy initialization */

  4093.     s->mb_intra = 0;

  4094. 

  4095.     if (v->dmb_is_raw)

  4096.         direct = get_bits1(gb);

  4097.     else

  4098.         direct = v->direct_mb_plane[mb_pos];

  4099.     if (v->skip_is_raw)

  4100.         skipped = get_bits1(gb);

  4101.     else

  4102.         skipped = v->s.mbskip_table[mb_pos];

  4103. 

  4104.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4105.     for (i = 0; i < 6; i++) {

  4106.         v->mb_type[0][s->block_index[i]] = 0;

  4107.         s->dc_val[0][s->block_index[i]]  = 0;

  4108.     }

  4109.     s->current_picture.qscale_table[mb_pos] = 0;

  4110. 

  4111.     if (!direct) {

  4112.         if (!skipped) {

  4113.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  4114.             dmv_x[1] = dmv_x[0];

  4115.             dmv_y[1] = dmv_y[0];

  4116.         }

  4117.         if (skipped || !s->mb_intra) {

  4118.             bmvtype = decode012(gb);

  4119.             switch (bmvtype) {

  4120.             case 0:

  4121.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  4122.                 break;

  4123.             case 1:

  4124.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  4125.                 break;

  4126.             case 2:

  4127.                 bmvtype  = BMV_TYPE_INTERPOLATED;

  4128.                 dmv_x[0] = dmv_y[0] = 0;

  4129.             }

  4130.         }

  4131.     }

  4132.     for (i = 0; i < 6; i++)

  4133.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4134. 

  4135.     if (skipped) {

  4136.         if (direct)

  4137.             bmvtype = BMV_TYPE_INTERPOLATED;

  4138.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4139.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4140.         return;

  4141.     }

  4142.     if (direct) {

  4143.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4144.         GET_MQUANT();

  4145.         s->mb_intra = 0;

  4146.         s->current_picture.qscale_table[mb_pos] = mquant;

  4147.         if (!v->ttmbf)

  4148.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4149.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  4150.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4151.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4152.     } else {

  4153.         if (!mb_has_coeffs && !s->mb_intra) {

  4154.             /* no coded blocks - effectively skipped */

  4155.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4156.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4157.             return;

  4158.         }

  4159.         if (s->mb_intra && !mb_has_coeffs) {

  4160.             GET_MQUANT();

  4161.             s->current_picture.qscale_table[mb_pos] = mquant;

  4162.             s->ac_pred = get_bits1(gb);

  4163.             cbp = 0;

  4164.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4165.         } else {

  4166.             if (bmvtype == BMV_TYPE_INTERPOLATED) {

  4167.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  4168.                 if (!mb_has_coeffs) {

  4169.                     /* interpolated skipped block */

  4170.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4171.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4172.                     return;

  4173.                 }

  4174.             }

  4175.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4176.             if (!s->mb_intra) {

  4177.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4178.             }

  4179.             if (s->mb_intra)

  4180.                 s->ac_pred = get_bits1(gb);

  4181.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4182.             GET_MQUANT();

  4183.             s->current_picture.qscale_table[mb_pos] = mquant;

  4184.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  4185.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4186.         }

  4187.     }

  4188.     dst_idx = 0;

  4189.     for (i = 0; i < 6; i++) {

  4190.         s->dc_val[0][s->block_index[i]] = 0;

  4191.         dst_idx += i >> 2;

  4192.         val = ((cbp >> (5 - i)) & 1);

  4193.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4194.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4195.         if (s->mb_intra) {

  4196.             /* check if prediction blocks A and C are available */

  4197.             v->a_avail = v->c_avail = 0;

  4198.             if (i == 2 || i == 3 || !s->first_slice_line)

  4199.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4200.             if (i == 1 || i == 3 || s->mb_x)

  4201.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4202. 

  4203.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4204.                                    (i & 4) ? v->codingset2 : v->codingset);

  4205.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4206.                 continue;

  4207.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4208.             if (v->rangeredfrm)

  4209.                 for (j = 0; j < 64; j++)

  4210.                     s->block[i][j] <<= 1;

  4211.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  4212.         } else if (val) {

  4213.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4214.                                first_block, s->dest[dst_idx] + off,

  4215.                                (i & 4) ? s->uvlinesize : s->linesize,

  4216.                                (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4217.             if (!v->ttmbf && ttmb < 8)

  4218.                 ttmb = -1;

  4219.             first_block = 0;

  4220.         }

  4221.     }

  4222. }

  4223. 

  4224. /** Decode one B-frame MB (in interlaced field B picture)

  4225.  */

  4226. static void vc1_decode_b_mb_intfi(VC1Context *v)

  4227. {

  4228.     MpegEncContext *s = &v->s;

  4229.     GetBitContext *gb = &s->gb;

  4230.     int i, j;

  4231.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4232.     int cbp = 0; /* cbp decoding stuff */

  4233.     int mqdiff, mquant; /* MB quantization */

  4234.     int ttmb = v->ttfrm; /* MB Transform type */

  4235.     int mb_has_coeffs = 0; /* last_flag */

  4236.     int val; /* temp value */

  4237.     int first_block = 1;

  4238.     int dst_idx, off;

  4239.     int fwd;

  4240.     int dmv_x[2], dmv_y[2], pred_flag[2];

  4241.     int bmvtype = BMV_TYPE_BACKWARD;

  4242.     int idx_mbmode, interpmvp;

  4243. 

  4244.     mquant      = v->pq; /* Lossy initialization */

  4245.     s->mb_intra = 0;

  4246. 

  4247.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  4248.     if (idx_mbmode <= 1) { // intra MB

  4249.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  4250.         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  4251.         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  4252.         s->current_picture.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;

  4253.         GET_MQUANT();

  4254.         s->current_picture.qscale_table[mb_pos] = mquant;

  4255.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  4256.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  4257.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  4258.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  4259.         mb_has_coeffs = idx_mbmode & 1;

  4260.         if (mb_has_coeffs)

  4261.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  4262.         dst_idx = 0;

  4263.         for (i = 0; i < 6; i++) {

  4264.             s->dc_val[0][s->block_index[i]] = 0;

  4265.             dst_idx += i >> 2;

  4266.             val = ((cbp >> (5 - i)) & 1);

  4267.             v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4268.             v->a_avail                       = v->c_avail = 0;

  4269.             if (i == 2 || i == 3 || !s->first_slice_line)

  4270.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4271.             if (i == 1 || i == 3 || s->mb_x)

  4272.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4273. 

  4274.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4275.                                    (i & 4) ? v->codingset2 : v->codingset);

  4276.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4277.                 continue;

  4278.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4279.             if (v->rangeredfrm)

  4280.                 for (j = 0; j < 64; j++)

  4281.                     s->block[i][j] <<= 1;

  4282.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4283.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  4284.             // TODO: yet to perform loop filter

  4285.         }

  4286.     } else {

  4287.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4288.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  4289.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  4290.         if (v->fmb_is_raw)

  4291.             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);

  4292.         else

  4293.             fwd = v->forward_mb_plane[mb_pos];

  4294.         if (idx_mbmode <= 5) { // 1-MV

  4295.             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4296.             pred_flag[0] = pred_flag[1] = 0;

  4297.             if (fwd)

  4298.                 bmvtype = BMV_TYPE_FORWARD;

  4299.             else {

  4300.                 bmvtype = decode012(gb);

  4301.                 switch (bmvtype) {

  4302.                 case 0:

  4303.                     bmvtype = BMV_TYPE_BACKWARD;

  4304.                     break;

  4305.                 case 1:

  4306.                     bmvtype = BMV_TYPE_DIRECT;

  4307.                     break;

  4308.                 case 2:

  4309.                     bmvtype   = BMV_TYPE_INTERPOLATED;

  4310.                     interpmvp = get_bits1(gb);

  4311.                 }

  4312.             }

  4313.             v->bmvtype = bmvtype;

  4314.             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {

  4315.                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4316.             }

  4317.             if (bmvtype == BMV_TYPE_INTERPOLATED && interpmvp) {

  4318.                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);

  4319.             }

  4320.             if (bmvtype == BMV_TYPE_DIRECT) {

  4321.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4322.                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;

  4323.             }

  4324.             vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);

  4325.             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);

  4326.             mb_has_coeffs = !(idx_mbmode & 2);

  4327.         } else { // 4-MV

  4328.             if (fwd)

  4329.                 bmvtype = BMV_TYPE_FORWARD;

  4330.             v->bmvtype  = bmvtype;

  4331.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4332.             for (i = 0; i < 6; i++) {

  4333.                 if (i < 4) {

  4334.                     dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4335.                     dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;

  4336.                     val = ((v->fourmvbp >> (3 - i)) & 1);

  4337.                     if (val) {

  4338.                         get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],

  4339.                                                  &dmv_y[bmvtype == BMV_TYPE_BACKWARD],

  4340.                                              &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4341.                     }

  4342.                     vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);

  4343.                     vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD, 0);

  4344.                 } else if (i == 4)

  4345.                     vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);

  4346.             }

  4347.             mb_has_coeffs = idx_mbmode & 1;

  4348.         }

  4349.         if (mb_has_coeffs)

  4350.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4351.         if (cbp) {

  4352.             GET_MQUANT();

  4353.         }

  4354.         s->current_picture.qscale_table[mb_pos] = mquant;

  4355.         if (!v->ttmbf && cbp) {

  4356.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4357.         }

  4358.         dst_idx = 0;

  4359.         for (i = 0; i < 6; i++) {

  4360.             s->dc_val[0][s->block_index[i]] = 0;

  4361.             dst_idx += i >> 2;

  4362.             val = ((cbp >> (5 - i)) & 1);

  4363.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  4364.             if (val) {

  4365.                 vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4366.                                    first_block, s->dest[dst_idx] + off,

  4367.                                    (i & 4) ? s->uvlinesize : s->linesize,

  4368.                                    (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4369.                 if (!v->ttmbf && ttmb < 8)

  4370.                     ttmb = -1;

  4371.                 first_block = 0;

  4372.             }

  4373.         }

  4374.     }

  4375. }

  4376. 

  4377. /** Decode one B-frame MB (in interlaced frame B picture)

  4378.  */

  4379. static int vc1_decode_b_mb_intfr(VC1Context *v)

  4380. {

  4381.     MpegEncContext *s = &v->s;

  4382.     GetBitContext *gb = &s->gb;

  4383.     int i, j;

  4384.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4385.     int cbp = 0; /* cbp decoding stuff */

  4386.     int mqdiff, mquant; /* MB quantization */

  4387.     int ttmb = v->ttfrm; /* MB Transform type */

  4388.     int mvsw = 0; /* motion vector switch */

  4389.     int mb_has_coeffs = 1; /* last_flag */

  4390.     int dmv_x, dmv_y; /* Differential MV components */

  4391.     int val; /* temp value */

  4392.     int first_block = 1;

  4393.     int dst_idx, off;

  4394.     int skipped, direct, twomv = 0;

  4395.     int block_cbp = 0, pat, block_tt = 0;

  4396.     int idx_mbmode = 0, mvbp;

  4397.     int stride_y, fieldtx;

  4398.     int bmvtype = BMV_TYPE_BACKWARD;

  4399.     int dir, dir2;

  4400. 

  4401.     mquant = v->pq; /* Lossy initialization */

  4402.     s->mb_intra = 0;

  4403.     if (v->skip_is_raw)

  4404.         skipped = get_bits1(gb);

  4405.     else

  4406.         skipped = v->s.mbskip_table[mb_pos];

  4407. 

  4408.     if (!skipped) {

  4409.         idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);

  4410.         if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD)

  4411.         {

  4412.             twomv = 1;

  4413.             v->blk_mv_type[s->block_index[0]] = 1;

  4414.             v->blk_mv_type[s->block_index[1]] = 1;

  4415.             v->blk_mv_type[s->block_index[2]] = 1;

  4416.             v->blk_mv_type[s->block_index[3]] = 1;

  4417.         } else {

  4418.             v->blk_mv_type[s->block_index[0]] = 0;

  4419.             v->blk_mv_type[s->block_index[1]] = 0;

  4420.             v->blk_mv_type[s->block_index[2]] = 0;

  4421.             v->blk_mv_type[s->block_index[3]] = 0;

  4422.         }

  4423.     }

  4424. 

  4425.     if (v->dmb_is_raw)

  4426.         direct = get_bits1(gb);

  4427.     else

  4428.         direct = v->direct_mb_plane[mb_pos];

  4429. 

  4430.     if (direct) {

  4431.         s->mv[0][0][0] = s->current_picture.motion_val[0][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 0, s->quarter_sample);

  4432.         s->mv[0][0][1] = s->current_picture.motion_val[0][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 0, s->quarter_sample);

  4433.         s->mv[1][0][0] = s->current_picture.motion_val[1][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 1, s->quarter_sample);

  4434.         s->mv[1][0][1] = s->current_picture.motion_val[1][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 1, s->quarter_sample);

  4435. 

  4436.         if (twomv) {

  4437.             s->mv[0][2][0] = s->current_picture.motion_val[0][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 0, s->quarter_sample);

  4438.             s->mv[0][2][1] = s->current_picture.motion_val[0][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 0, s->quarter_sample);

  4439.             s->mv[1][2][0] = s->current_picture.motion_val[1][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 1, s->quarter_sample);

  4440.             s->mv[1][2][1] = s->current_picture.motion_val[1][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 1, s->quarter_sample);

  4441. 

  4442.             for (i = 1; i < 4; i+=2) {

  4443.                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];

  4444.                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];

  4445.                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];

  4446.                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];

  4447.             }

  4448.         } else {

  4449.             for (i = 1; i < 4; i++) {

  4450.                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];

  4451.                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];

  4452.                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];

  4453.                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];

  4454.             }

  4455.         }

  4456.     }

  4457. 

  4458.     if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  4459.         for (i = 0; i < 4; i++) {

  4460.             s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;

  4461.             s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;

  4462.             s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  4463.             s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  4464.         }

  4465.         s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  4466.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  4467.         for (i = 0; i < 6; i++)

  4468.             v->mb_type[0][s->block_index[i]] = 1;

  4469.         fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  4470.         mb_has_coeffs = get_bits1(gb);

  4471.         if (mb_has_coeffs)

  4472.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4473.         v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  4474.         GET_MQUANT();

  4475.         s->current_picture.qscale_table[mb_pos] = mquant;

  4476.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  4477.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  4478.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  4479.         dst_idx = 0;

  4480.         for (i = 0; i < 6; i++) {

  4481.             s->dc_val[0][s->block_index[i]] = 0;

  4482.             dst_idx += i >> 2;

  4483.             val = ((cbp >> (5 - i)) & 1);

  4484.             v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4485.             v->a_avail = v->c_avail = 0;

  4486.             if (i == 2 || i == 3 || !s->first_slice_line)

  4487.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4488.             if (i == 1 || i == 3 || s->mb_x)

  4489.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4490. 

  4491.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4492.                                    (i & 4) ? v->codingset2 : v->codingset);

  4493.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  4494.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4495.             if (i < 4) {

  4496.                 stride_y = s->linesize << fieldtx;

  4497.                 off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  4498.             } else {

  4499.                 stride_y = s->uvlinesize;

  4500.                 off = 0;

  4501.             }

  4502.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, stride_y);

  4503.         }

  4504.     } else {

  4505.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4506.         if (!direct) {

  4507.             if (skipped || !s->mb_intra) {

  4508.                 bmvtype = decode012(gb);

  4509.                 switch (bmvtype) {

  4510.                 case 0:

  4511.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  4512.                     break;

  4513.                 case 1:

  4514.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  4515.                     break;

  4516.                 case 2:

  4517.                     bmvtype  = BMV_TYPE_INTERPOLATED;

  4518.                 }

  4519.             }

  4520. 

  4521.             if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)

  4522.                 mvsw = get_bits1(gb);

  4523.         }

  4524. 

  4525.         if (!skipped) { // inter MB

  4526.             mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];

  4527.             if (mb_has_coeffs)

  4528.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4529.             if (!direct) {

  4530.                 if (bmvtype == BMV_TYPE_INTERPOLATED & twomv) {

  4531.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4532.                 }

  4533.                 else if (bmvtype == BMV_TYPE_INTERPOLATED | twomv) {

  4534.                     v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  4535.                 }

  4536.             }

  4537. 

  4538.             for (i = 0; i < 6; i++)

  4539.                 v->mb_type[0][s->block_index[i]] = 0;

  4540.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];

  4541.             /* for all motion vector read MVDATA and motion compensate each block */

  4542.             dst_idx = 0;

  4543.             if (direct) {

  4544.                 if (twomv) {

  4545.                     for (i = 0; i < 4; i++) {

  4546.                         vc1_mc_4mv_luma(v, i, 0, 0);

  4547.                         vc1_mc_4mv_luma(v, i, 1, 1);

  4548.                     }

  4549.                     vc1_mc_4mv_chroma4(v);

  4550.                 } else {

  4551.                     vc1_mc_1mv(v, 0);

  4552.                     vc1_interp_mc(v);

  4553.                 }

  4554.             } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {

  4555.                 mvbp = v->fourmvbp;

  4556.                 for (i = 0; i < 4; i++) {

  4557.                     dir = i==1 || i==3;

  4558.                     dmv_x = dmv_y = 0;

  4559.                     val = ((mvbp >> (3 - i)) & 1);

  4560.                     if (val) {

  4561.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4562.                     }

  4563.                     j = i > 1 ? 2 : 0;

  4564.                     vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  4565.                     vc1_mc_4mv_luma(v, j, dir, dir);

  4566.                     vc1_mc_4mv_luma(v, j+1, dir, dir);

  4567.                 }

  4568. 

  4569.                 vc1_mc_4mv_chroma4(v);

  4570.             } else if (bmvtype == BMV_TYPE_INTERPOLATED) {

  4571.                 mvbp = v->twomvbp;

  4572.                 dmv_x = dmv_y = 0;

  4573.                 if (mvbp & 2) {

  4574.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4575.                 }

  4576. 

  4577.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  4578.                 vc1_mc_1mv(v, 0);

  4579. 

  4580.                 dmv_x = dmv_y = 0;

  4581.                 if (mvbp & 1) {

  4582.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4583.                 }

  4584. 

  4585.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  4586.                 vc1_interp_mc(v);

  4587.             } else if (twomv) {

  4588.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  4589.                 dir2 = dir;

  4590.                 if (mvsw)

  4591.                     dir2 = !dir;

  4592.                 mvbp = v->twomvbp;

  4593.                 dmv_x = dmv_y = 0;

  4594.                 if (mvbp & 2) {

  4595.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4596.                 }

  4597.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  4598. 

  4599.                 dmv_x = dmv_y = 0;

  4600.                 if (mvbp & 1) {

  4601.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4602.                 }

  4603.                 vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);

  4604. 

  4605.                 if (mvsw) {

  4606.                     for (i = 0; i<2; i++) {

  4607.                         s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];

  4608.                         s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];

  4609.                         s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];

  4610.                         s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];

  4611.                     }

  4612.                 } else {

  4613.                     vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  4614.                     vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  4615.                 }

  4616. 

  4617.                 vc1_mc_4mv_luma(v, 0, dir, 0);

  4618.                 vc1_mc_4mv_luma(v, 1, dir, 0);

  4619.                 vc1_mc_4mv_luma(v, 2, dir2, 0);

  4620.                 vc1_mc_4mv_luma(v, 3, dir2, 0);

  4621.                 vc1_mc_4mv_chroma4(v);

  4622.             } else {

  4623.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  4624. 

  4625.                 mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];

  4626.                 dmv_x = dmv_y = 0;

  4627.                 if (mvbp) {

  4628.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4629.                 }

  4630. 

  4631.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  4632.                 v->blk_mv_type[s->block_index[0]] = 1;

  4633.                 v->blk_mv_type[s->block_index[1]] = 1;

  4634.                 v->blk_mv_type[s->block_index[2]] = 1;

  4635.                 v->blk_mv_type[s->block_index[3]] = 1;

  4636.                 vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  4637.                 for (i = 0; i<2; i++) {

  4638.                     s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];

  4639.                     s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];

  4640.                 }

  4641.                 vc1_mc_1mv(v, dir);

  4642.             }

  4643. 

  4644.             if (cbp)

  4645.                 GET_MQUANT();  // p. 227

  4646.             s->current_picture.qscale_table[mb_pos] = mquant;

  4647.             if (!v->ttmbf && cbp)

  4648.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4649.             for (i = 0; i < 6; i++) {

  4650.                 s->dc_val[0][s->block_index[i]] = 0;

  4651.                 dst_idx += i >> 2;

  4652.                 val = ((cbp >> (5 - i)) & 1);

  4653.                 if (!fieldtx)

  4654.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4655.                 else

  4656.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  4657.                 if (val) {

  4658.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4659.                                              first_block, s->dest[dst_idx] + off,

  4660.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  4661.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  4662.                     block_cbp |= pat << (i << 2);

  4663.                     if (!v->ttmbf && ttmb < 8)

  4664.                         ttmb = -1;

  4665.                     first_block = 0;

  4666.                 }

  4667.             }

  4668. 

  4669.         } else { // skipped

  4670.             dir = 0;

  4671.             for (i = 0; i < 6; i++) {

  4672.                 v->mb_type[0][s->block_index[i]] = 0;

  4673.                 s->dc_val[0][s->block_index[i]] = 0;

  4674.             }

  4675.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  4676.             s->current_picture.qscale_table[mb_pos] = 0;

  4677.             v->blk_mv_type[s->block_index[0]] = 0;

  4678.             v->blk_mv_type[s->block_index[1]] = 0;

  4679.             v->blk_mv_type[s->block_index[2]] = 0;

  4680.             v->blk_mv_type[s->block_index[3]] = 0;

  4681. 

  4682.             if (!direct) {

  4683.                 if (bmvtype == BMV_TYPE_INTERPOLATED) {

  4684.                     vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  4685.                     vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  4686.                 } else {

  4687.                     dir = bmvtype == BMV_TYPE_BACKWARD;

  4688.                     vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  4689.                     if (mvsw) {

  4690.                         int dir2 = dir;

  4691.                         if (mvsw)

  4692.                             dir2 = !dir;

  4693.                         for (i = 0; i<2; i++) {

  4694.                             s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];

  4695.                             s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];

  4696.                             s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];

  4697.                             s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];

  4698.                         }

  4699.                     } else {

  4700.                         v->blk_mv_type[s->block_index[0]] = 1;

  4701.                         v->blk_mv_type[s->block_index[1]] = 1;

  4702.                         v->blk_mv_type[s->block_index[2]] = 1;

  4703.                         v->blk_mv_type[s->block_index[3]] = 1;

  4704.                         vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  4705.                         for (i = 0; i<2; i++) {

  4706.                             s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];

  4707.                             s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];

  4708.                         }

  4709.                     }

  4710.                 }

  4711.             }

  4712. 

  4713.             vc1_mc_1mv(v, dir);

  4714.             if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {

  4715.                 vc1_interp_mc(v);

  4716.             }

  4717.         }

  4718.     }

  4719.     if (s->mb_x == s->mb_width - 1)

  4720.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);

  4721.     v->cbp[s->mb_x]      = block_cbp;

  4722.     v->ttblk[s->mb_x]    = block_tt;

  4723.     return 0;

  4724. }

  4725. 

  4726. /** Decode blocks of I-frame

  4727.  */

  4728. static void vc1_decode_i_blocks(VC1Context *v)

  4729. {

  4730.     int k, j;

  4731.     MpegEncContext *s = &v->s;

  4732.     int cbp, val;

  4733.     uint8_t *coded_val;

  4734.     int mb_pos;

  4735. 

  4736.     /* select codingmode used for VLC tables selection */

  4737.     switch (v->y_ac_table_index) {

  4738.     case 0:

  4739.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4740.         break;

  4741.     case 1:

  4742.         v->codingset = CS_HIGH_MOT_INTRA;

  4743.         break;

  4744.     case 2:

  4745.         v->codingset = CS_MID_RATE_INTRA;

  4746.         break;

  4747.     }

  4748. 

  4749.     switch (v->c_ac_table_index) {

  4750.     case 0:

  4751.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4752.         break;

  4753.     case 1:

  4754.         v->codingset2 = CS_HIGH_MOT_INTER;

  4755.         break;

  4756.     case 2:

  4757.         v->codingset2 = CS_MID_RATE_INTER;

  4758.         break;

  4759.     }

  4760. 

  4761.     /* Set DC scale - y and c use the same */

  4762.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  4763.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  4764. 

  4765.     //do frame decode

  4766.     s->mb_x = s->mb_y = 0;

  4767.     s->mb_intra         = 1;

  4768.     s->first_slice_line = 1;

  4769.     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {

  4770.         s->mb_x = 0;

  4771.         init_block_index(v);

  4772.         for (; s->mb_x < v->end_mb_x; s->mb_x++) {

  4773.             uint8_t *dst[6];

  4774.             ff_update_block_index(s);

  4775.             dst[0] = s->dest[0];

  4776.             dst[1] = dst[0] + 8;

  4777.             dst[2] = s->dest[0] + s->linesize * 8;

  4778.             dst[3] = dst[2] + 8;

  4779.             dst[4] = s->dest[1];

  4780.             dst[5] = s->dest[2];

  4781.             s->dsp.clear_blocks(s->block[0]);

  4782.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  4783.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  4784.             s->current_picture.qscale_table[mb_pos]                = v->pq;

  4785.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  4786.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  4787. 

  4788.             // do actual MB decoding and displaying

  4789.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4790.             v->s.ac_pred = get_bits1(&v->s.gb);

  4791. 

  4792.             for (k = 0; k < 6; k++) {

  4793.                 val = ((cbp >> (5 - k)) & 1);

  4794. 

  4795.                 if (k < 4) {

  4796.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4797.                     val        = val ^ pred;

  4798.                     *coded_val = val;

  4799.                 }

  4800.                 cbp |= val << (5 - k);

  4801. 

  4802.                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);

  4803. 

  4804.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4805.                     continue;

  4806.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);

  4807.                 if (v->pq >= 9 && v->overlap) {

  4808.                     if (v->rangeredfrm)

  4809.                         for (j = 0; j < 64; j++)

  4810.                             s->block[k][j] <<= 1;

  4811.                     s->dsp.put_signed_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4812.                 } else {

  4813.                     if (v->rangeredfrm)

  4814.                         for (j = 0; j < 64; j++)

  4815.                             s->block[k][j] = (s->block[k][j] - 64) << 1;

  4816.                     s->dsp.put_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4817.                 }

  4818.             }

  4819. 

  4820.             if (v->pq >= 9 && v->overlap) {

  4821.                 if (s->mb_x) {

  4822.                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);

  4823.                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4824.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4825.                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  4826.                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  4827.                     }

  4828.                 }

  4829.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  4830.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4831.                 if (!s->first_slice_line) {

  4832.                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);

  4833.                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  4834.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4835.                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  4836.                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  4837.                     }

  4838.                 }

  4839.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4840.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4841.             }

  4842.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  4843. 

  4844.             if (get_bits_count(&s->gb) > v->bits) {

  4845.                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);

  4846.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4847.                        get_bits_count(&s->gb), v->bits);

  4848.                 return;

  4849.             }

  4850.         }

  4851.         if (!v->s.loop_filter)

  4852.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  4853.         else if (s->mb_y)

  4854.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4855. 

  4856.         s->first_slice_line = 0;

  4857.     }

  4858.     if (v->s.loop_filter)

  4859.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4860. 

  4861.     /* This is intentionally mb_height and not end_mb_y - unlike in advanced

  4862.      * profile, these only differ are when decoding MSS2 rectangles. */

  4863.     ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);

  4864. }

  4865. 

  4866. /** Decode blocks of I-frame for advanced profile

  4867.  */

  4868. static void vc1_decode_i_blocks_adv(VC1Context *v)

  4869. {

  4870.     int k;

  4871.     MpegEncContext *s = &v->s;

  4872.     int cbp, val;

  4873.     uint8_t *coded_val;

  4874.     int mb_pos;

  4875.     int mquant = v->pq;

  4876.     int mqdiff;

  4877.     GetBitContext *gb = &s->gb;

  4878. 

  4879.     /* select codingmode used for VLC tables selection */

  4880.     switch (v->y_ac_table_index) {

  4881.     case 0:

  4882.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4883.         break;

  4884.     case 1:

  4885.         v->codingset = CS_HIGH_MOT_INTRA;

  4886.         break;

  4887.     case 2:

  4888.         v->codingset = CS_MID_RATE_INTRA;

  4889.         break;

  4890.     }

  4891. 

  4892.     switch (v->c_ac_table_index) {

  4893.     case 0:

  4894.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4895.         break;

  4896.     case 1:

  4897.         v->codingset2 = CS_HIGH_MOT_INTER;

  4898.         break;

  4899.     case 2:

  4900.         v->codingset2 = CS_MID_RATE_INTER;

  4901.         break;

  4902.     }

  4903. 

  4904.     // do frame decode

  4905.     s->mb_x             = s->mb_y = 0;

  4906.     s->mb_intra         = 1;

  4907.     s->first_slice_line = 1;

  4908.     s->mb_y             = s->start_mb_y;

  4909.     if (s->start_mb_y) {

  4910.         s->mb_x = 0;

  4911.         init_block_index(v);

  4912.         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,

  4913.                (1 + s->b8_stride) * sizeof(*s->coded_block));

  4914.     }

  4915.     for (; s->mb_y < s->end_mb_y; s->mb_y++) {

  4916.         s->mb_x = 0;

  4917.         init_block_index(v);

  4918.         for (;s->mb_x < s->mb_width; s->mb_x++) {

  4919.             int16_t (*block)[64] = v->block[v->cur_blk_idx];

  4920.             ff_update_block_index(s);

  4921.             s->dsp.clear_blocks(block[0]);

  4922.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4923.             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;

  4924.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  4925.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  4926. 

  4927.             // do actual MB decoding and displaying

  4928.             if (v->fieldtx_is_raw)

  4929.                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);

  4930.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4931.             if ( v->acpred_is_raw)

  4932.                 v->s.ac_pred = get_bits1(&v->s.gb);

  4933.             else

  4934.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  4935. 

  4936.             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)

  4937.                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);

  4938. 

  4939.             GET_MQUANT();

  4940. 

  4941.             s->current_picture.qscale_table[mb_pos] = mquant;

  4942.             /* Set DC scale - y and c use the same */

  4943.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  4944.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  4945. 

  4946.             for (k = 0; k < 6; k++) {

  4947.                 val = ((cbp >> (5 - k)) & 1);

  4948. 

  4949.                 if (k < 4) {

  4950.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4951.                     val        = val ^ pred;

  4952.                     *coded_val = val;

  4953.                 }

  4954.                 cbp |= val << (5 - k);

  4955. 

  4956.                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);

  4957.                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);

  4958. 

  4959.                 vc1_decode_i_block_adv(v, block[k], k, val,

  4960.                                        (k < 4) ? v->codingset : v->codingset2, mquant);

  4961. 

  4962.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4963.                     continue;

  4964.                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);

  4965.             }

  4966. 

  4967.             vc1_smooth_overlap_filter_iblk(v);

  4968.             vc1_put_signed_blocks_clamped(v);

  4969.             if (v->s.loop_filter) vc1_loop_filter_iblk_delayed(v, v->pq);

  4970. 

  4971.             if (get_bits_count(&s->gb) > v->bits) {

  4972.                 // TODO: may need modification to handle slice coding

  4973.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4974.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4975.                        get_bits_count(&s->gb), v->bits);

  4976.                 return;

  4977.             }

  4978.         }

  4979.         if (!v->s.loop_filter)

  4980.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  4981.         else if (s->mb_y)

  4982.             ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);

  4983.         s->first_slice_line = 0;

  4984.     }

  4985. 

  4986.     /* raw bottom MB row */

  4987.     s->mb_x = 0;

  4988.     init_block_index(v);

  4989. 

  4990.     for (;s->mb_x < s->mb_width; s->mb_x++) {

  4991.         ff_update_block_index(s);

  4992.         vc1_put_signed_blocks_clamped(v);

  4993.         if (v->s.loop_filter)

  4994.             vc1_loop_filter_iblk_delayed(v, v->pq);

  4995.     }

  4996.     if (v->s.loop_filter)

  4997.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y-1)*16, 16);

  4998.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4999.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  5000. }

  5001. 

  5002. static void vc1_decode_p_blocks(VC1Context *v)

  5003. {

  5004.     MpegEncContext *s = &v->s;

  5005.     int apply_loop_filter;

  5006. 

  5007.     /* select codingmode used for VLC tables selection */

  5008.     switch (v->c_ac_table_index) {

  5009.     case 0:

  5010.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  5011.         break;

  5012.     case 1:

  5013.         v->codingset = CS_HIGH_MOT_INTRA;

  5014.         break;

  5015.     case 2:

  5016.         v->codingset = CS_MID_RATE_INTRA;

  5017.         break;

  5018.     }

  5019. 

  5020.     switch (v->c_ac_table_index) {

  5021.     case 0:

  5022.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  5023.         break;

  5024.     case 1:

  5025.         v->codingset2 = CS_HIGH_MOT_INTER;

  5026.         break;

  5027.     case 2:

  5028.         v->codingset2 = CS_MID_RATE_INTER;

  5029.         break;

  5030.     }

  5031. 

  5032.     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY);

  5033.     s->first_slice_line = 1;

  5034.     memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);

  5035.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  5036.         s->mb_x = 0;

  5037.         init_block_index(v);

  5038.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  5039.             ff_update_block_index(s);

  5040. 

  5041.             if (v->fcm == ILACE_FIELD)

  5042.                 vc1_decode_p_mb_intfi(v);

  5043.             else if (v->fcm == ILACE_FRAME)

  5044.                 vc1_decode_p_mb_intfr(v);

  5045.             else vc1_decode_p_mb(v);

  5046.             if (s->mb_y != s->start_mb_y && apply_loop_filter && v->fcm == PROGRESSIVE)

  5047.                 vc1_apply_p_loop_filter(v);

  5048.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  5049.                 // TODO: may need modification to handle slice coding

  5050.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  5051.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  5052.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  5053.                 return;

  5054.             }

  5055.         }

  5056.         memmove(v->cbp_base,      v->cbp,      sizeof(v->cbp_base[0])      * s->mb_stride);

  5057.         memmove(v->ttblk_base,    v->ttblk,    sizeof(v->ttblk_base[0])    * s->mb_stride);

  5058.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  5059.         memmove(v->luma_mv_base,  v->luma_mv,  sizeof(v->luma_mv_base[0])  * s->mb_stride);

  5060.         if (s->mb_y != s->start_mb_y) ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  5061.         s->first_slice_line = 0;

  5062.     }

  5063.     if (apply_loop_filter && v->fcm == PROGRESSIVE) {

  5064.         s->mb_x = 0;

  5065.         init_block_index(v);

  5066.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  5067.             ff_update_block_index(s);

  5068.             vc1_apply_p_loop_filter(v);

  5069.         }

  5070.     }

  5071.     if (s->end_mb_y >= s->start_mb_y)

  5072.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  5073.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  5074.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  5075. }

  5076. 

  5077. static void vc1_decode_b_blocks(VC1Context *v)

  5078. {

  5079.     MpegEncContext *s = &v->s;

  5080. 

  5081.     /* select codingmode used for VLC tables selection */

  5082.     switch (v->c_ac_table_index) {

  5083.     case 0:

  5084.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  5085.         break;

  5086.     case 1:

  5087.         v->codingset = CS_HIGH_MOT_INTRA;

  5088.         break;

  5089.     case 2:

  5090.         v->codingset = CS_MID_RATE_INTRA;

  5091.         break;

  5092.     }

  5093. 

  5094.     switch (v->c_ac_table_index) {

  5095.     case 0:

  5096.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  5097.         break;

  5098.     case 1:

  5099.         v->codingset2 = CS_HIGH_MOT_INTER;

  5100.         break;

  5101.     case 2:

  5102.         v->codingset2 = CS_MID_RATE_INTER;

  5103.         break;

  5104.     }

  5105. 

  5106.     s->first_slice_line = 1;

  5107.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  5108.         s->mb_x = 0;

  5109.         init_block_index(v);

  5110.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  5111.             ff_update_block_index(s);

  5112. 

  5113.             if (v->fcm == ILACE_FIELD)

  5114.                 vc1_decode_b_mb_intfi(v);

  5115.             else if (v->fcm == ILACE_FRAME)

  5116.                 vc1_decode_b_mb_intfr(v);

  5117.             else

  5118.                 vc1_decode_b_mb(v);

  5119.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  5120.                 // TODO: may need modification to handle slice coding

  5121.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  5122.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  5123.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  5124.                 return;

  5125.             }

  5126.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  5127.         }

  5128.         if (!v->s.loop_filter)

  5129.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  5130.         else if (s->mb_y)

  5131.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  5132.         s->first_slice_line = 0;

  5133.     }

  5134.     if (v->s.loop_filter)

  5135.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  5136.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  5137.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  5138. }

  5139. 

  5140. static void vc1_decode_skip_blocks(VC1Context *v)

  5141. {

  5142.     MpegEncContext *s = &v->s;

  5143. 

  5144.     ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);

  5145.     s->first_slice_line = 1;

  5146.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  5147.         s->mb_x = 0;

  5148.         init_block_index(v);

  5149.         ff_update_block_index(s);

  5150.         if (s->last_picture.f.data[0]) {

  5151.             memcpy(s->dest[0], s->last_picture.f.data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);

  5152.             memcpy(s->dest[1], s->last_picture.f.data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  5153.             memcpy(s->dest[2], s->last_picture.f.data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  5154.         }

  5155.         ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  5156.         s->first_slice_line = 0;

  5157.     }

  5158.     s->pict_type = AV_PICTURE_TYPE_P;

  5159. }

  5160. 

  5161. void ff_vc1_decode_blocks(VC1Context *v)

  5162. {

  5163. 

  5164.     v->s.esc3_level_length = 0;

  5165.     if (v->x8_type) {

  5166.         ff_intrax8_decode_picture(&v->x8, 2*v->pq + v->halfpq, v->pq * !v->pquantizer);

  5167.     } else {

  5168.         v->cur_blk_idx     =  0;

  5169.         v->left_blk_idx    = -1;

  5170.         v->topleft_blk_idx =  1;

  5171.         v->top_blk_idx     =  2;

  5172.         switch (v->s.pict_type) {

  5173.         case AV_PICTURE_TYPE_I:

  5174.             if (v->profile == PROFILE_ADVANCED)

  5175.                 vc1_decode_i_blocks_adv(v);

  5176.             else

  5177.                 vc1_decode_i_blocks(v);

  5178.             break;

  5179.         case AV_PICTURE_TYPE_P:

  5180.             if (v->p_frame_skipped)

  5181.                 vc1_decode_skip_blocks(v);

  5182.             else

  5183.                 vc1_decode_p_blocks(v);

  5184.             break;

  5185.         case AV_PICTURE_TYPE_B:

  5186.             if (v->bi_type) {

  5187.                 if (v->profile == PROFILE_ADVANCED)

  5188.                     vc1_decode_i_blocks_adv(v);

  5189.                 else

  5190.                     vc1_decode_i_blocks(v);

  5191.             } else

  5192.                 vc1_decode_b_blocks(v);

  5193.             break;

  5194.         }

  5195.     }

  5196. }

  5197. 

  5198. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  5199. 

  5200. typedef struct {

  5201.     /**

  5202.      * Transform coefficients for both sprites in 16.16 fixed point format,

  5203.      * in the order they appear in the bitstream:

  5204.      *  x scale

  5205.      *  rotation 1 (unused)

  5206.      *  x offset

  5207.      *  rotation 2 (unused)

  5208.      *  y scale

  5209.      *  y offset

  5210.      *  alpha

  5211.      */

  5212.     int coefs[2][7];

  5213. 

  5214.     int effect_type, effect_flag;

  5215.     int effect_pcount1, effect_pcount2;   ///< amount of effect parameters stored in effect_params

  5216.     int effect_params1[15], effect_params2[10]; ///< effect parameters in 16.16 fixed point format

  5217. } SpriteData;

  5218. 

  5219. static inline int get_fp_val(GetBitContext* gb)

  5220. {

  5221.     return (get_bits_long(gb, 30) - (1 << 29)) << 1;

  5222. }

  5223. 

  5224. static void vc1_sprite_parse_transform(GetBitContext* gb, int c[7])

  5225. {

  5226.     c[1] = c[3] = 0;

  5227. 

  5228.     switch (get_bits(gb, 2)) {

  5229.     case 0:

  5230.         c[0] = 1 << 16;

  5231.         c[2] = get_fp_val(gb);

  5232.         c[4] = 1 << 16;

  5233.         break;

  5234.     case 1:

  5235.         c[0] = c[4] = get_fp_val(gb);

  5236.         c[2] = get_fp_val(gb);

  5237.         break;

  5238.     case 2:

  5239.         c[0] = get_fp_val(gb);

  5240.         c[2] = get_fp_val(gb);

  5241.         c[4] = get_fp_val(gb);

  5242.         break;

  5243.     case 3:

  5244.         c[0] = get_fp_val(gb);

  5245.         c[1] = get_fp_val(gb);

  5246.         c[2] = get_fp_val(gb);

  5247.         c[3] = get_fp_val(gb);

  5248.         c[4] = get_fp_val(gb);

  5249.         break;

  5250.     }

  5251.     c[5] = get_fp_val(gb);

  5252.     if (get_bits1(gb))

  5253.         c[6] = get_fp_val(gb);

  5254.     else

  5255.         c[6] = 1 << 16;

  5256. }

  5257. 

  5258. static void vc1_parse_sprites(VC1Context *v, GetBitContext* gb, SpriteData* sd)

  5259. {

  5260.     AVCodecContext *avctx = v->s.avctx;

  5261.     int sprite, i;

  5262. 

  5263.     for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  5264.         vc1_sprite_parse_transform(gb, sd->coefs[sprite]);

  5265.         if (sd->coefs[sprite][1] || sd->coefs[sprite][3])

  5266.             avpriv_request_sample(avctx, "Non-zero rotation coefficients");

  5267.         av_log(avctx, AV_LOG_DEBUG, sprite ? "S2:" : "S1:");

  5268.         for (i = 0; i < 7; i++)

  5269.             av_log(avctx, AV_LOG_DEBUG, " %d.%.3d",

  5270.                    sd->coefs[sprite][i] / (1<<16),

  5271.                    (abs(sd->coefs[sprite][i]) & 0xFFFF) * 1000 / (1 << 16));

  5272.         av_log(avctx, AV_LOG_DEBUG, "\n");

  5273.     }

  5274. 

  5275.     skip_bits(gb, 2);

  5276.     if (sd->effect_type = get_bits_long(gb, 30)) {

  5277.         switch (sd->effect_pcount1 = get_bits(gb, 4)) {

  5278.         case 7:

  5279.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  5280.             break;

  5281.         case 14:

  5282.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  5283.             vc1_sprite_parse_transform(gb, sd->effect_params1 + 7);

  5284.             break;

  5285.         default:

  5286.             for (i = 0; i < sd->effect_pcount1; i++)

  5287.                 sd->effect_params1[i] = get_fp_val(gb);

  5288.         }

  5289.         if (sd->effect_type != 13 || sd->effect_params1[0] != sd->coefs[0][6]) {

  5290.             // effect 13 is simple alpha blending and matches the opacity above

  5291.             av_log(avctx, AV_LOG_DEBUG, "Effect: %d; params: ", sd->effect_type);

  5292.             for (i = 0; i < sd->effect_pcount1; i++)

  5293.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  5294.                        sd->effect_params1[i] / (1 << 16),

  5295.                        (abs(sd->effect_params1[i]) & 0xFFFF) * 1000 / (1 << 16));

  5296.             av_log(avctx, AV_LOG_DEBUG, "\n");

  5297.         }

  5298. 

  5299.         sd->effect_pcount2 = get_bits(gb, 16);

  5300.         if (sd->effect_pcount2 > 10) {

  5301.             av_log(avctx, AV_LOG_ERROR, "Too many effect parameters\n");

  5302.             return;

  5303.         } else if (sd->effect_pcount2) {

  5304.             i = -1;

  5305.             av_log(avctx, AV_LOG_DEBUG, "Effect params 2: ");

  5306.             while (++i < sd->effect_pcount2) {

  5307.                 sd->effect_params2[i] = get_fp_val(gb);

  5308.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  5309.                        sd->effect_params2[i] / (1 << 16),

  5310.                        (abs(sd->effect_params2[i]) & 0xFFFF) * 1000 / (1 << 16));

  5311.             }

  5312.             av_log(avctx, AV_LOG_DEBUG, "\n");

  5313.         }

  5314.     }

  5315.     if (sd->effect_flag = get_bits1(gb))

  5316.         av_log(avctx, AV_LOG_DEBUG, "Effect flag set\n");

  5317. 

  5318.     if (get_bits_count(gb) >= gb->size_in_bits +

  5319.        (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE ? 64 : 0))

  5320.         av_log(avctx, AV_LOG_ERROR, "Buffer overrun\n");

  5321.     if (get_bits_count(gb) < gb->size_in_bits - 8)

  5322.         av_log(avctx, AV_LOG_WARNING, "Buffer not fully read\n");

  5323. }

  5324. 

  5325. static void vc1_draw_sprites(VC1Context *v, SpriteData* sd)

  5326. {

  5327.     int i, plane, row, sprite;

  5328.     int sr_cache[2][2] = { { -1, -1 }, { -1, -1 } };

  5329.     uint8_t* src_h[2][2];

  5330.     int xoff[2], xadv[2], yoff[2], yadv[2], alpha;

  5331.     int ysub[2];

  5332.     MpegEncContext *s = &v->s;

  5333. 

  5334.     for (i = 0; i < 2; i++) {

  5335.         xoff[i] = av_clip(sd->coefs[i][2], 0, v->sprite_width-1 << 16);

  5336.         xadv[i] = sd->coefs[i][0];

  5337.         if (xadv[i] != 1<<16 || (v->sprite_width << 16) - (v->output_width << 16) - xoff[i])

  5338.             xadv[i] = av_clip(xadv[i], 0, ((v->sprite_width<<16) - xoff[i] - 1) / v->output_width);

  5339. 

  5340.         yoff[i] = av_clip(sd->coefs[i][5], 0, v->sprite_height-1 << 16);

  5341.         yadv[i] = av_clip(sd->coefs[i][4], 0, ((v->sprite_height << 16) - yoff[i]) / v->output_height);

  5342.     }

  5343.     alpha = av_clip(sd->coefs[1][6], 0, (1<<16) - 1);

  5344. 

  5345.     for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++) {

  5346.         int width = v->output_width>>!!plane;

  5347. 

  5348.         for (row = 0; row < v->output_height>>!!plane; row++) {

  5349.             uint8_t *dst = v->sprite_output_frame.data[plane] +

  5350.                            v->sprite_output_frame.linesize[plane] * row;

  5351. 

  5352.             for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  5353.                 uint8_t *iplane = s->current_picture.f.data[plane];

  5354.                 int      iline  = s->current_picture.f.linesize[plane];

  5355.                 int      ycoord = yoff[sprite] + yadv[sprite] * row;

  5356.                 int      yline  = ycoord >> 16;

  5357.                 int      next_line;

  5358.                 ysub[sprite] = ycoord & 0xFFFF;

  5359.                 if (sprite) {

  5360.                     iplane = s->last_picture.f.data[plane];

  5361.                     iline  = s->last_picture.f.linesize[plane];

  5362.                 }

  5363.                 next_line = FFMIN(yline + 1, (v->sprite_height >> !!plane) - 1) * iline;

  5364.                 if (!(xoff[sprite] & 0xFFFF) && xadv[sprite] == 1 << 16) {

  5365.                         src_h[sprite][0] = iplane + (xoff[sprite] >> 16) +  yline      * iline;

  5366.                     if (ysub[sprite])

  5367.                         src_h[sprite][1] = iplane + (xoff[sprite] >> 16) + next_line;

  5368.                 } else {

  5369.                     if (sr_cache[sprite][0] != yline) {

  5370.                         if (sr_cache[sprite][1] == yline) {

  5371.                             FFSWAP(uint8_t*, v->sr_rows[sprite][0], v->sr_rows[sprite][1]);

  5372.                             FFSWAP(int,        sr_cache[sprite][0],   sr_cache[sprite][1]);

  5373.                         } else {

  5374.                             v->vc1dsp.sprite_h(v->sr_rows[sprite][0], iplane + yline * iline, xoff[sprite], xadv[sprite], width);

  5375.                             sr_cache[sprite][0] = yline;

  5376.                         }

  5377.                     }

  5378.                     if (ysub[sprite] && sr_cache[sprite][1] != yline + 1) {

  5379.                         v->vc1dsp.sprite_h(v->sr_rows[sprite][1],

  5380.                                            iplane + next_line, xoff[sprite],

  5381.                                            xadv[sprite], width);

  5382.                         sr_cache[sprite][1] = yline + 1;

  5383.                     }

  5384.                     src_h[sprite][0] = v->sr_rows[sprite][0];

  5385.                     src_h[sprite][1] = v->sr_rows[sprite][1];

  5386.                 }

  5387.             }

  5388. 

  5389.             if (!v->two_sprites) {

  5390.                 if (ysub[0]) {

  5391.                     v->vc1dsp.sprite_v_single(dst, src_h[0][0], src_h[0][1], ysub[0], width);

  5392.                 } else {

  5393.                     memcpy(dst, src_h[0][0], width);

  5394.                 }

  5395.             } else {

  5396.                 if (ysub[0] && ysub[1]) {

  5397.                     v->vc1dsp.sprite_v_double_twoscale(dst, src_h[0][0], src_h[0][1], ysub[0],

  5398.                                                        src_h[1][0], src_h[1][1], ysub[1], alpha, width);

  5399.                 } else if (ysub[0]) {

  5400.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[0][0], src_h[0][1], ysub[0],

  5401.                                                        src_h[1][0], alpha, width);

  5402.                 } else if (ysub[1]) {

  5403.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[1][0], src_h[1][1], ysub[1],

  5404.                                                        src_h[0][0], (1<<16)-1-alpha, width);

  5405.                 } else {

  5406.                     v->vc1dsp.sprite_v_double_noscale(dst, src_h[0][0], src_h[1][0], alpha, width);

  5407.                 }

  5408.             }

  5409.         }

  5410. 

  5411.         if (!plane) {

  5412.             for (i = 0; i < 2; i++) {

  5413.                 xoff[i] >>= 1;

  5414.                 yoff[i] >>= 1;

  5415.             }

  5416.         }

  5417. 

  5418.     }

  5419. }

  5420. 

  5421. 

  5422. static int vc1_decode_sprites(VC1Context *v, GetBitContext* gb)

  5423. {

  5424.     int ret;

  5425.     MpegEncContext *s     = &v->s;

  5426.     AVCodecContext *avctx = s->avctx;

  5427.     SpriteData sd;

  5428. 

  5429.     vc1_parse_sprites(v, gb, &sd);

  5430. 

  5431.     if (!s->current_picture.f.data[0]) {

  5432.         av_log(avctx, AV_LOG_ERROR, "Got no sprites\n");

  5433.         return -1;

  5434.     }

  5435. 

  5436.     if (v->two_sprites && (!s->last_picture_ptr || !s->last_picture.f.data[0])) {

  5437.         av_log(avctx, AV_LOG_WARNING, "Need two sprites, only got one\n");

  5438.         v->two_sprites = 0;

  5439.     }

  5440. 

  5441.     av_frame_unref(&v->sprite_output_frame);

  5442.     if ((ret = ff_get_buffer(avctx, &v->sprite_output_frame, 0)) < 0)

  5443.         return ret;

  5444. 

  5445.     vc1_draw_sprites(v, &sd);

  5446. 

  5447.     return 0;

  5448. }

  5449. 

  5450. static void vc1_sprite_flush(AVCodecContext *avctx)

  5451. {

  5452.     VC1Context *v     = avctx->priv_data;

  5453.     MpegEncContext *s = &v->s;

  5454.     AVFrame *f = &s->current_picture.f;

  5455.     int plane, i;

  5456. 

  5457.     /* Windows Media Image codecs have a convergence interval of two keyframes.

  5458.        Since we can't enforce it, clear to black the missing sprite. This is

  5459.        wrong but it looks better than doing nothing. */

  5460. 

  5461.     if (f->data[0])

  5462.         for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++)

  5463.             for (i = 0; i < v->sprite_height>>!!plane; i++)

  5464.                 memset(f->data[plane] + i * f->linesize[plane],

  5465.                        plane ? 128 : 0, f->linesize[plane]);

  5466. }

  5467. 

  5468. #endif

  5469. 

  5470. av_cold int ff_vc1_decode_init_alloc_tables(VC1Context *v)

  5471. {

  5472.     MpegEncContext *s = &v->s;

  5473.     int i;

  5474. 

  5475.     /* Allocate mb bitplanes */

  5476.     v->mv_type_mb_plane = av_malloc (s->mb_stride * s->mb_height);

  5477.     v->direct_mb_plane  = av_malloc (s->mb_stride * s->mb_height);

  5478.     v->forward_mb_plane = av_malloc (s->mb_stride * s->mb_height);

  5479.     v->fieldtx_plane    = av_mallocz(s->mb_stride * s->mb_height);

  5480.     v->acpred_plane     = av_malloc (s->mb_stride * s->mb_height);

  5481.     v->over_flags_plane = av_malloc (s->mb_stride * s->mb_height);

  5482. 

  5483.     v->n_allocated_blks = s->mb_width + 2;

  5484.     v->block            = av_malloc(sizeof(*v->block) * v->n_allocated_blks);

  5485.     v->cbp_base         = av_malloc(sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  5486.     v->cbp              = v->cbp_base + s->mb_stride;

  5487.     v->ttblk_base       = av_malloc(sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  5488.     v->ttblk            = v->ttblk_base + s->mb_stride;

  5489.     v->is_intra_base    = av_mallocz(sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  5490.     v->is_intra         = v->is_intra_base + s->mb_stride;

  5491.     v->luma_mv_base     = av_malloc(sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);

  5492.     v->luma_mv          = v->luma_mv_base + s->mb_stride;

  5493. 

  5494.     /* allocate block type info in that way so it could be used with s->block_index[] */

  5495.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5496.     v->mb_type[0]   = v->mb_type_base + s->b8_stride + 1;

  5497.     v->mb_type[1]   = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  5498.     v->mb_type[2]   = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  5499. 

  5500.     /* allocate memory to store block level MV info */

  5501.     v->blk_mv_type_base = av_mallocz(     s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5502.     v->blk_mv_type      = v->blk_mv_type_base + s->b8_stride + 1;

  5503.     v->mv_f_base        = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5504.     v->mv_f[0]          = v->mv_f_base + s->b8_stride + 1;

  5505.     v->mv_f[1]          = v->mv_f[0] + (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5506.     v->mv_f_last_base   = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5507.     v->mv_f_last[0]     = v->mv_f_last_base + s->b8_stride + 1;

  5508.     v->mv_f_last[1]     = v->mv_f_last[0] + (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5509.     v->mv_f_next_base   = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5510.     v->mv_f_next[0]     = v->mv_f_next_base + s->b8_stride + 1;

  5511.     v->mv_f_next[1]     = v->mv_f_next[0] + (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5512. 

  5513.     /* Init coded blocks info */

  5514.     if (v->profile == PROFILE_ADVANCED) {

  5515. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  5516. //            return -1;

  5517. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  5518. //            return -1;

  5519.     }

  5520. 

  5521.     ff_intrax8_common_init(&v->x8,s);

  5522. 

  5523.     if (s->avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || s->avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5524.         for (i = 0; i < 4; i++)

  5525.             if (!(v->sr_rows[i >> 1][i & 1] = av_malloc(v->output_width))) return -1;

  5526.     }

  5527. 

  5528.     if (!v->mv_type_mb_plane || !v->direct_mb_plane || !v->acpred_plane || !v->over_flags_plane ||

  5529.         !v->block || !v->cbp_base || !v->ttblk_base || !v->is_intra_base || !v->luma_mv_base ||

  5530.         !v->mb_type_base)

  5531.             return -1;

  5532. 

  5533.     return 0;

  5534. }

  5535. 

  5536. av_cold void ff_vc1_init_transposed_scantables(VC1Context *v)

  5537. {

  5538.     int i;

  5539.     for (i = 0; i < 64; i++) {

  5540. #define transpose(x) ((x >> 3) | ((x & 7) << 3))

  5541.         v->zz_8x8[0][i] = transpose(ff_wmv1_scantable[0][i]);

  5542.         v->zz_8x8[1][i] = transpose(ff_wmv1_scantable[1][i]);

  5543.         v->zz_8x8[2][i] = transpose(ff_wmv1_scantable[2][i]);

  5544.         v->zz_8x8[3][i] = transpose(ff_wmv1_scantable[3][i]);

  5545.         v->zzi_8x8[i]   = transpose(ff_vc1_adv_interlaced_8x8_zz[i]);

  5546.     }

  5547.     v->left_blk_sh = 0;

  5548.     v->top_blk_sh  = 3;

  5549. }

  5550. 

  5551. /** Initialize a VC1/WMV3 decoder

  5552.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5553.  * @todo TODO: Decypher remaining bits in extra_data

  5554.  */

  5555. static av_cold int vc1_decode_init(AVCodecContext *avctx)

  5556. {

  5557.     VC1Context *v = avctx->priv_data;

  5558.     MpegEncContext *s = &v->s;

  5559.     GetBitContext gb;

  5560. 

  5561.     /* save the container output size for WMImage */

  5562.     v->output_width  = avctx->width;

  5563.     v->output_height = avctx->height;

  5564. 

  5565.     if (!avctx->extradata_size || !avctx->extradata)

  5566.         return -1;

  5567.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  5568.         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);

  5569.     else

  5570.         avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  5571.     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);

  5572.     v->s.avctx = avctx;

  5573.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  5574.     v->s.flags   |= CODEC_FLAG_EMU_EDGE;

  5575. 

  5576.     if (ff_vc1_init_common(v) < 0)

  5577.         return -1;

  5578.     // ensure static VLC tables are initialized

  5579.     if (ff_msmpeg4_decode_init(avctx) < 0)

  5580.         return -1;

  5581.     if (ff_vc1_decode_init_alloc_tables(v) < 0)

  5582.         return -1;

  5583.     // Hack to ensure the above functions will be called

  5584.     // again once we know all necessary settings.

  5585.     // That this is necessary might indicate a bug.

  5586.     ff_vc1_decode_end(avctx);

  5587. 

  5588.     ff_h264chroma_init(&v->h264chroma, 8);

  5589.     ff_vc1dsp_init(&v->vc1dsp);

  5590. 

  5591.     if (avctx->codec_id == AV_CODEC_ID_WMV3 || avctx->codec_id == AV_CODEC_ID_WMV3IMAGE) {

  5592.         int count = 0;

  5593. 

  5594.         // looks like WMV3 has a sequence header stored in the extradata

  5595.         // advanced sequence header may be before the first frame

  5596.         // the last byte of the extradata is a version number, 1 for the

  5597.         // samples we can decode

  5598. 

  5599.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  5600. 

  5601.         if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0)

  5602.           return -1;

  5603. 

  5604.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  5605.         if (count > 0) {

  5606.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  5607.                    count, get_bits(&gb, count));

  5608.         } else if (count < 0) {

  5609.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  5610.         }

  5611.     } else { // VC1/WVC1/WVP2

  5612.         const uint8_t *start = avctx->extradata;

  5613.         uint8_t *end = avctx->extradata + avctx->extradata_size;

  5614.         const uint8_t *next;

  5615.         int size, buf2_size;

  5616.         uint8_t *buf2 = NULL;

  5617.         int seq_initialized = 0, ep_initialized = 0;

  5618. 

  5619.         if (avctx->extradata_size < 16) {

  5620.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  5621.             return -1;

  5622.         }

  5623. 

  5624.         buf2  = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5625.         start = find_next_marker(start, end); // in WVC1 extradata first byte is its size, but can be 0 in mkv

  5626.         next  = start;

  5627.         for (; next < end; start = next) {

  5628.             next = find_next_marker(start + 4, end);

  5629.             size = next - start - 4;

  5630.             if (size <= 0)

  5631.                 continue;

  5632.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  5633.             init_get_bits(&gb, buf2, buf2_size * 8);

  5634.             switch (AV_RB32(start)) {

  5635.             case VC1_CODE_SEQHDR:

  5636.                 if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0) {

  5637.                     av_free(buf2);

  5638.                     return -1;

  5639.                 }

  5640.                 seq_initialized = 1;

  5641.                 break;

  5642.             case VC1_CODE_ENTRYPOINT:

  5643.                 if (ff_vc1_decode_entry_point(avctx, v, &gb) < 0) {

  5644.                     av_free(buf2);

  5645.                     return -1;

  5646.                 }

  5647.                 ep_initialized = 1;

  5648.                 break;

  5649.             }

  5650.         }

  5651.         av_free(buf2);

  5652.         if (!seq_initialized || !ep_initialized) {

  5653.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  5654.             return -1;

  5655.         }

  5656.         v->res_sprite = (avctx->codec_id == AV_CODEC_ID_VC1IMAGE);

  5657.     }

  5658. 

  5659.     avctx->profile = v->profile;

  5660.     if (v->profile == PROFILE_ADVANCED)

  5661.         avctx->level = v->level;

  5662. 

  5663.     avctx->has_b_frames = !!avctx->max_b_frames;

  5664. 

  5665.     s->mb_width  = (avctx->coded_width  + 15) >> 4;

  5666.     s->mb_height = (avctx->coded_height + 15) >> 4;

  5667. 

  5668.     if (v->profile == PROFILE_ADVANCED || v->res_fasttx) {

  5669.         ff_vc1_init_transposed_scantables(v);

  5670.     } else {

  5671.         memcpy(v->zz_8x8, ff_wmv1_scantable, 4*64);

  5672.         v->left_blk_sh = 3;

  5673.         v->top_blk_sh  = 0;

  5674.     }

  5675. 

  5676.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5677.         v->sprite_width  = avctx->coded_width;

  5678.         v->sprite_height = avctx->coded_height;

  5679. 

  5680.         avctx->coded_width  = avctx->width  = v->output_width;

  5681.         avctx->coded_height = avctx->height = v->output_height;

  5682. 

  5683.         // prevent 16.16 overflows

  5684.         if (v->sprite_width  > 1 << 14 ||

  5685.             v->sprite_height > 1 << 14 ||

  5686.             v->output_width  > 1 << 14 ||

  5687.             v->output_height > 1 << 14) return -1;

  5688. 

  5689.         if ((v->sprite_width&1) || (v->sprite_height&1)) {

  5690.             avpriv_request_sample(avctx, "odd sprites support");

  5691.             return AVERROR_PATCHWELCOME;

  5692.         }

  5693.     }

  5694.     return 0;

  5695. }

  5696. 

  5697. /** Close a VC1/WMV3 decoder

  5698.  * @warning Initial try at using MpegEncContext stuff

  5699.  */

  5700. av_cold int ff_vc1_decode_end(AVCodecContext *avctx)

  5701. {

  5702.     VC1Context *v = avctx->priv_data;

  5703.     int i;

  5704. 

  5705.     av_frame_unref(&v->sprite_output_frame);

  5706. 

  5707.     for (i = 0; i < 4; i++)

  5708.         av_freep(&v->sr_rows[i >> 1][i & 1]);

  5709.     av_freep(&v->hrd_rate);

  5710.     av_freep(&v->hrd_buffer);

  5711.     ff_MPV_common_end(&v->s);

  5712.     av_freep(&v->mv_type_mb_plane);

  5713.     av_freep(&v->direct_mb_plane);

  5714.     av_freep(&v->forward_mb_plane);

  5715.     av_freep(&v->fieldtx_plane);

  5716.     av_freep(&v->acpred_plane);

  5717.     av_freep(&v->over_flags_plane);

  5718.     av_freep(&v->mb_type_base);

  5719.     av_freep(&v->blk_mv_type_base);

  5720.     av_freep(&v->mv_f_base);

  5721.     av_freep(&v->mv_f_last_base);

  5722.     av_freep(&v->mv_f_next_base);

  5723.     av_freep(&v->block);

  5724.     av_freep(&v->cbp_base);

  5725.     av_freep(&v->ttblk_base);

  5726.     av_freep(&v->is_intra_base); // FIXME use v->mb_type[]

  5727.     av_freep(&v->luma_mv_base);

  5728.     ff_intrax8_common_end(&v->x8);

  5729.     return 0;

  5730. }

  5731. 

  5732. 

  5733. /** Decode a VC1/WMV3 frame

  5734.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5735.  */

  5736. static int vc1_decode_frame(AVCodecContext *avctx, void *data,

  5737.                             int *got_frame, AVPacket *avpkt)

  5738. {

  5739.     const uint8_t *buf = avpkt->data;

  5740.     int buf_size = avpkt->size, n_slices = 0, i, ret;

  5741.     VC1Context *v = avctx->priv_data;

  5742.     MpegEncContext *s = &v->s;

  5743.     AVFrame *pict = data;

  5744.     uint8_t *buf2 = NULL;

  5745.     const uint8_t *buf_start = buf, *buf_start_second_field = NULL;

  5746.     int mb_height, n_slices1=-1;

  5747.     struct {

  5748.         uint8_t *buf;

  5749.         GetBitContext gb;

  5750.         int mby_start;

  5751.     } *slices = NULL, *tmp;

  5752. 

  5753.     v->second_field = 0;

  5754. 

  5755.     if(s->flags & CODEC_FLAG_LOW_DELAY)

  5756.         s->low_delay = 1;

  5757. 

  5758.     /* no supplementary picture */

  5759.     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == VC1_CODE_ENDOFSEQ)) {

  5760.         /* special case for last picture */

  5761.         if (s->low_delay == 0 && s->next_picture_ptr) {

  5762.             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)

  5763.                 return ret;

  5764.             s->next_picture_ptr = NULL;

  5765. 

  5766.             *got_frame = 1;

  5767.         }

  5768. 

  5769.         return buf_size;

  5770.     }

  5771. 

  5772.     if (s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {

  5773.         if (v->profile < PROFILE_ADVANCED)

  5774.             avctx->pix_fmt = AV_PIX_FMT_VDPAU_WMV3;

  5775.         else

  5776.             avctx->pix_fmt = AV_PIX_FMT_VDPAU_VC1;

  5777.     }

  5778. 

  5779.     //for advanced profile we may need to parse and unescape data

  5780.     if (avctx->codec_id == AV_CODEC_ID_VC1 || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5781.         int buf_size2 = 0;

  5782.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5783. 

  5784.         if (IS_MARKER(AV_RB32(buf))) { /* frame starts with marker and needs to be parsed */

  5785.             const uint8_t *start, *end, *next;

  5786.             int size;

  5787. 

  5788.             next = buf;

  5789.             for (start = buf, end = buf + buf_size; next < end; start = next) {

  5790.                 next = find_next_marker(start + 4, end);

  5791.                 size = next - start - 4;

  5792.                 if (size <= 0) continue;

  5793.                 switch (AV_RB32(start)) {

  5794.                 case VC1_CODE_FRAME:

  5795.                     if (avctx->hwaccel ||

  5796.                         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5797.                         buf_start = start;

  5798.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5799.                     break;

  5800.                 case VC1_CODE_FIELD: {

  5801.                     int buf_size3;

  5802.                     if (avctx->hwaccel ||

  5803.                         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5804.                         buf_start_second_field = start;

  5805.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5806.                     if (!tmp)

  5807.                         goto err;

  5808.                     slices = tmp;

  5809.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5810.                     if (!slices[n_slices].buf)

  5811.                         goto err;

  5812.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5813.                                                     slices[n_slices].buf);

  5814.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5815.                                   buf_size3 << 3);

  5816.                     /* assuming that the field marker is at the exact middle,

  5817.                        hope it's correct */

  5818.                     slices[n_slices].mby_start = s->mb_height >> 1;

  5819.                     n_slices1 = n_slices - 1; // index of the last slice of the first field

  5820.                     n_slices++;

  5821.                     break;

  5822.                 }

  5823.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  5824.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5825.                     init_get_bits(&s->gb, buf2, buf_size2 * 8);

  5826.                     ff_vc1_decode_entry_point(avctx, v, &s->gb);

  5827.                     break;

  5828.                 case VC1_CODE_SLICE: {

  5829.                     int buf_size3;

  5830.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5831.                     if (!tmp)

  5832.                         goto err;

  5833.                     slices = tmp;

  5834.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5835.                     if (!slices[n_slices].buf)

  5836.                         goto err;

  5837.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5838.                                                     slices[n_slices].buf);

  5839.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5840.                                   buf_size3 << 3);

  5841.                     slices[n_slices].mby_start = get_bits(&slices[n_slices].gb, 9);

  5842.                     n_slices++;

  5843.                     break;

  5844.                 }

  5845.                 }

  5846.             }

  5847.         } else if (v->interlace && ((buf[0] & 0xC0) == 0xC0)) { /* WVC1 interlaced stores both fields divided by marker */

  5848.             const uint8_t *divider;

  5849.             int buf_size3;

  5850. 

  5851.             divider = find_next_marker(buf, buf + buf_size);

  5852.             if ((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD) {

  5853.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  5854.                 goto err;

  5855.             } else { // found field marker, unescape second field

  5856.                 if (avctx->hwaccel ||

  5857.                     s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5858.                     buf_start_second_field = divider;

  5859.                 tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5860.                 if (!tmp)

  5861.                     goto err;

  5862.                 slices = tmp;

  5863.                 slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5864.                 if (!slices[n_slices].buf)

  5865.                     goto err;

  5866.                 buf_size3 = vc1_unescape_buffer(divider + 4, buf + buf_size - divider - 4, slices[n_slices].buf);

  5867.                 init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5868.                               buf_size3 << 3);

  5869.                 slices[n_slices].mby_start = s->mb_height >> 1;

  5870.                 n_slices1 = n_slices - 1;

  5871.                 n_slices++;

  5872.             }

  5873.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  5874.         } else {

  5875.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  5876.         }

  5877.         init_get_bits(&s->gb, buf2, buf_size2*8);

  5878.     } else

  5879.         init_get_bits(&s->gb, buf, buf_size*8);

  5880. 

  5881.     if (v->res_sprite) {

  5882.         v->new_sprite  = !get_bits1(&s->gb);

  5883.         v->two_sprites =  get_bits1(&s->gb);

  5884.         /* res_sprite means a Windows Media Image stream, AV_CODEC_ID_*IMAGE means

  5885.            we're using the sprite compositor. These are intentionally kept separate

  5886.            so you can get the raw sprites by using the wmv3 decoder for WMVP or

  5887.            the vc1 one for WVP2 */

  5888.         if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5889.             if (v->new_sprite) {

  5890.                 // switch AVCodecContext parameters to those of the sprites

  5891.                 avctx->width  = avctx->coded_width  = v->sprite_width;

  5892.                 avctx->height = avctx->coded_height = v->sprite_height;

  5893.             } else {

  5894.                 goto image;

  5895.             }

  5896.         }

  5897.     }

  5898. 

  5899.     if (s->context_initialized &&

  5900.         (s->width  != avctx->coded_width ||

  5901.          s->height != avctx->coded_height)) {

  5902.         ff_vc1_decode_end(avctx);

  5903.     }

  5904. 

  5905.     if (!s->context_initialized) {

  5906.         if (ff_msmpeg4_decode_init(avctx) < 0 || ff_vc1_decode_init_alloc_tables(v) < 0)

  5907.             goto err;

  5908. 

  5909.         s->low_delay = !avctx->has_b_frames || v->res_sprite;

  5910. 

  5911.         if (v->profile == PROFILE_ADVANCED) {

  5912.             if(avctx->coded_width<=1 || avctx->coded_height<=1)

  5913.                 goto err;

  5914.             s->h_edge_pos = avctx->coded_width;

  5915.             s->v_edge_pos = avctx->coded_height;

  5916.         }

  5917.     }

  5918. 

  5919.     /* We need to set current_picture_ptr before reading the header,

  5920.      * otherwise we cannot store anything in there. */

  5921.     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {

  5922.         int i = ff_find_unused_picture(s, 0);

  5923.         if (i < 0)

  5924.             goto err;

  5925.         s->current_picture_ptr = &s->picture[i];

  5926.     }

  5927. 

  5928.     // do parse frame header

  5929.     v->pic_header_flag = 0;

  5930.     v->first_pic_header_flag = 1;

  5931.     if (v->profile < PROFILE_ADVANCED) {

  5932.         if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {

  5933.             goto err;

  5934.         }

  5935.     } else {

  5936.         if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5937.             goto err;

  5938.         }

  5939.     }

  5940.     v->first_pic_header_flag = 0;

  5941. 

  5942.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  5943.         av_log(v->s.avctx, AV_LOG_DEBUG, "pict_type: %c\n", av_get_picture_type_char(s->pict_type));

  5944. 

  5945.     if ((avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE)

  5946.         && s->pict_type != AV_PICTURE_TYPE_I) {

  5947.         av_log(v->s.avctx, AV_LOG_ERROR, "Sprite decoder: expected I-frame\n");

  5948.         goto err;

  5949.     }

  5950. 

  5951.     if ((s->mb_height >> v->field_mode) == 0) {

  5952.         av_log(v->s.avctx, AV_LOG_ERROR, "image too short\n");

  5953.         goto err;

  5954.     }

  5955. 

  5956.     // process pulldown flags

  5957.     s->current_picture_ptr->f.repeat_pict = 0;

  5958.     // Pulldown flags are only valid when 'broadcast' has been set.

  5959.     // So ticks_per_frame will be 2

  5960.     if (v->rff) {

  5961.         // repeat field

  5962.         s->current_picture_ptr->f.repeat_pict = 1;

  5963.     } else if (v->rptfrm) {

  5964.         // repeat frames

  5965.         s->current_picture_ptr->f.repeat_pict = v->rptfrm * 2;

  5966.     }

  5967. 

  5968.     // for skipping the frame

  5969.     s->current_picture.f.pict_type = s->pict_type;

  5970.     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;

  5971. 

  5972.     /* skip B-frames if we don't have reference frames */

  5973.     if (s->last_picture_ptr == NULL && (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) {

  5974.         goto err;

  5975.     }

  5976.     if ((avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B) ||

  5977.         (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I) ||

  5978.          avctx->skip_frame >= AVDISCARD_ALL) {

  5979.         goto end;

  5980.     }

  5981. 

  5982.     if (s->next_p_frame_damaged) {

  5983.         if (s->pict_type == AV_PICTURE_TYPE_B)

  5984.             goto end;

  5985.         else

  5986.             s->next_p_frame_damaged = 0;

  5987.     }

  5988. 

  5989.     if (ff_MPV_frame_start(s, avctx) < 0) {

  5990.         goto err;

  5991.     }

  5992. 

  5993.     v->s.current_picture_ptr->f.interlaced_frame = (v->fcm != PROGRESSIVE);

  5994.     v->s.current_picture_ptr->f.top_field_first  = v->tff;

  5995. 

  5996.     s->me.qpel_put = s->dsp.put_qpel_pixels_tab;

  5997.     s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;

  5998. 

  5999.     if ((CONFIG_VC1_VDPAU_DECODER)

  6000.         &&s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  6001.         ff_vdpau_vc1_decode_picture(s, buf_start, (buf + buf_size) - buf_start);

  6002.     else if (avctx->hwaccel) {

  6003.         if (v->field_mode && buf_start_second_field) {

  6004.             // decode first field

  6005.             s->picture_structure = PICT_BOTTOM_FIELD - v->tff;

  6006.             if (avctx->hwaccel->start_frame(avctx, buf_start, buf_start_second_field - buf_start) < 0)

  6007.                 goto err;

  6008.             if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_start_second_field - buf_start) < 0)

  6009.                 goto err;

  6010.             if (avctx->hwaccel->end_frame(avctx) < 0)

  6011.                 goto err;

  6012. 

  6013.             // decode second field

  6014.             s->gb = slices[n_slices1 + 1].gb;

  6015.             s->picture_structure = PICT_TOP_FIELD + v->tff;

  6016.             v->second_field = 1;

  6017.             v->pic_header_flag = 0;

  6018.             if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  6019.                 av_log(avctx, AV_LOG_ERROR, "parsing header for second field failed");

  6020.                 goto err;

  6021.             }

  6022.             v->s.current_picture_ptr->f.pict_type = v->s.pict_type;

  6023. 

  6024.             if (avctx->hwaccel->start_frame(avctx, buf_start_second_field, (buf + buf_size) - buf_start_second_field) < 0)

  6025.                 goto err;

  6026.             if (avctx->hwaccel->decode_slice(avctx, buf_start_second_field, (buf + buf_size) - buf_start_second_field) < 0)

  6027.                 goto err;

  6028.             if (avctx->hwaccel->end_frame(avctx) < 0)

  6029.                 goto err;

  6030.         } else {

  6031.             s->picture_structure = PICT_FRAME;

  6032.             if (avctx->hwaccel->start_frame(avctx, buf_start, (buf + buf_size) - buf_start) < 0)

  6033.                 goto err;

  6034.             if (avctx->hwaccel->decode_slice(avctx, buf_start, (buf + buf_size) - buf_start) < 0)

  6035.                 goto err;

  6036.             if (avctx->hwaccel->end_frame(avctx) < 0)

  6037.                 goto err;

  6038.         }

  6039.     } else {

  6040.         int header_ret = 0;

  6041. 

  6042. 

  6043.         ff_mpeg_er_frame_start(s);

  6044. 

  6045.         v->bits = buf_size * 8;

  6046.         v->end_mb_x = s->mb_width;

  6047.         if (v->field_mode) {

  6048.             s->current_picture.f.linesize[0] <<= 1;

  6049.             s->current_picture.f.linesize[1] <<= 1;

  6050.             s->current_picture.f.linesize[2] <<= 1;

  6051.             s->linesize                      <<= 1;

  6052.             s->uvlinesize                    <<= 1;

  6053.         }

  6054.         mb_height = s->mb_height >> v->field_mode;

  6055.         for (i = 0; i <= n_slices; i++) {

  6056.             if (i > 0 &&  slices[i - 1].mby_start >= mb_height) {

  6057.                 if (v->field_mode <= 0) {

  6058.                     av_log(v->s.avctx, AV_LOG_ERROR, "Slice %d starts beyond "

  6059.                            "picture boundary (%d >= %d)\n", i,

  6060.                            slices[i - 1].mby_start, mb_height);

  6061.                     continue;

  6062.                 }

  6063.                 v->second_field = 1;

  6064.                 v->blocks_off   = s->b8_stride * (s->mb_height&~1);

  6065.                 v->mb_off       = s->mb_stride * s->mb_height >> 1;

  6066.             } else {

  6067.                 v->second_field = 0;

  6068.                 v->blocks_off   = 0;

  6069.                 v->mb_off       = 0;

  6070.             }

  6071.             if (i) {

  6072.                 v->pic_header_flag = 0;

  6073.                 if (v->field_mode && i == n_slices1 + 2) {

  6074.                     if ((header_ret = ff_vc1_parse_frame_header_adv(v, &s->gb)) < 0) {

  6075.                         av_log(v->s.avctx, AV_LOG_ERROR, "Field header damaged\n");

  6076.                         continue;

  6077.                     }

  6078.                 } else if (get_bits1(&s->gb)) {

  6079.                     v->pic_header_flag = 1;

  6080.                     if ((header_ret = ff_vc1_parse_frame_header_adv(v, &s->gb)) < 0) {

  6081.                         av_log(v->s.avctx, AV_LOG_ERROR, "Slice header damaged\n");

  6082.                         continue;

  6083.                     }

  6084.                 }

  6085.             }

  6086.             if (header_ret < 0)

  6087.                 continue;

  6088.             s->start_mb_y = (i == 0) ? 0 : FFMAX(0, slices[i-1].mby_start % mb_height);

  6089.             if (!v->field_mode || v->second_field)

  6090.                 s->end_mb_y = (i == n_slices     ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  6091.             else {

  6092.                 if (i >= n_slices) {

  6093.                     av_log(v->s.avctx, AV_LOG_ERROR, "first field slice count too large\n");

  6094.                     continue;

  6095.                 }

  6096.                 s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  6097.             }

  6098.             if (s->end_mb_y <= s->start_mb_y) {

  6099.                 av_log(v->s.avctx, AV_LOG_ERROR, "end mb y %d %d invalid\n", s->end_mb_y, s->start_mb_y);

  6100.                 continue;

  6101.             }

  6102.             if (!v->p_frame_skipped && s->pict_type != AV_PICTURE_TYPE_I && !v->cbpcy_vlc) {

  6103.                 av_log(v->s.avctx, AV_LOG_ERROR, "missing cbpcy_vlc\n");

  6104.                 continue;

  6105.             }

  6106.             ff_vc1_decode_blocks(v);

  6107.             if (i != n_slices)

  6108.                 s->gb = slices[i].gb;

  6109.         }

  6110.         if (v->field_mode) {

  6111.             v->second_field = 0;

  6112.             s->current_picture.f.linesize[0] >>= 1;

  6113.             s->current_picture.f.linesize[1] >>= 1;

  6114.             s->current_picture.f.linesize[2] >>= 1;

  6115.             s->linesize                      >>= 1;

  6116.             s->uvlinesize                    >>= 1;

  6117.             if (v->s.pict_type != AV_PICTURE_TYPE_BI && v->s.pict_type != AV_PICTURE_TYPE_B) {

  6118.                 uint8_t *tmp[2];

  6119.                 tmp[0]          = v->mv_f_last[0];

  6120.                 tmp[1]          = v->mv_f_last[1];

  6121.                 v->mv_f_last[0] = v->mv_f_next[0];

  6122.                 v->mv_f_last[1] = v->mv_f_next[1];

  6123.                 v->mv_f_next[0] = v->mv_f[0];

  6124.                 v->mv_f_next[1] = v->mv_f[1];

  6125.                 v->mv_f[0] = tmp[0];

  6126.                 v->mv_f[1] = tmp[1];

  6127.             }

  6128.         }

  6129.         av_dlog(s->avctx, "Consumed %i/%i bits\n",

  6130.                 get_bits_count(&s->gb), s->gb.size_in_bits);

  6131. //  if (get_bits_count(&s->gb) > buf_size * 8)

  6132. //      return -1;

  6133.         if(s->er.error_occurred && s->pict_type == AV_PICTURE_TYPE_B)

  6134.             goto err;

  6135.         if(!v->field_mode)

  6136.             ff_er_frame_end(&s->er);

  6137.     }

  6138. 

  6139.     ff_MPV_frame_end(s);

  6140. 

  6141.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  6142. image:

  6143.         avctx->width  = avctx->coded_width  = v->output_width;

  6144.         avctx->height = avctx->coded_height = v->output_height;

  6145.         if (avctx->skip_frame >= AVDISCARD_NONREF)

  6146.             goto end;

  6147. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  6148.         if (vc1_decode_sprites(v, &s->gb))

  6149.             goto err;

  6150. #endif

  6151.         if ((ret = av_frame_ref(pict, &v->sprite_output_frame)) < 0)

  6152.             goto err;

  6153.         *got_frame = 1;

  6154.     } else {

  6155.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  6156.             if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)

  6157.                 goto err;

  6158.             ff_print_debug_info(s, s->current_picture_ptr, pict);

  6159.         } else if (s->last_picture_ptr != NULL) {

  6160.             if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)

  6161.                 goto err;

  6162.             ff_print_debug_info(s, s->last_picture_ptr, pict);

  6163.         }

  6164.         if (s->last_picture_ptr || s->low_delay) {

  6165.             *got_frame = 1;

  6166.         }

  6167.     }

  6168. 

  6169. end:

  6170.     av_free(buf2);

  6171.     for (i = 0; i < n_slices; i++)

  6172.         av_free(slices[i].buf);

  6173.     av_free(slices);

  6174.     return buf_size;

  6175. 

  6176. err:

  6177.     av_free(buf2);

  6178.     for (i = 0; i < n_slices; i++)

  6179.         av_free(slices[i].buf);

  6180.     av_free(slices);

  6181.     return -1;

  6182. }

  6183. 

  6184. 

  6185. static const AVProfile profiles[] = {

  6186.     { FF_PROFILE_VC1_SIMPLE,   "Simple"   },

  6187.     { FF_PROFILE_VC1_MAIN,     "Main"     },

  6188.     { FF_PROFILE_VC1_COMPLEX,  "Complex"  },

  6189.     { FF_PROFILE_VC1_ADVANCED, "Advanced" },

  6190.     { FF_PROFILE_UNKNOWN },

  6191. };

  6192. 

  6193. static const enum AVPixelFormat vc1_hwaccel_pixfmt_list_420[] = {

  6194. #if CONFIG_DXVA2

  6195.     AV_PIX_FMT_DXVA2_VLD,

  6196. #endif

  6197. #if CONFIG_VAAPI

  6198.     AV_PIX_FMT_VAAPI_VLD,

  6199. #endif

  6200. #if CONFIG_VDPAU

  6201.     AV_PIX_FMT_VDPAU,

  6202. #endif

  6203.     AV_PIX_FMT_YUV420P,

  6204.     AV_PIX_FMT_NONE

  6205. };

  6206. 

  6207. AVCodec ff_vc1_decoder = {

  6208.     .name           = "vc1",

  6209.     .type           = AVMEDIA_TYPE_VIDEO,

  6210.     .id             = AV_CODEC_ID_VC1,

  6211.     .priv_data_size = sizeof(VC1Context),

  6212.     .init           = vc1_decode_init,

  6213.     .close          = ff_vc1_decode_end,

  6214.     .decode         = vc1_decode_frame,

  6215.     .flush          = ff_mpeg_flush,

  6216.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  6217.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1"),

  6218.     .pix_fmts       = vc1_hwaccel_pixfmt_list_420,

  6219.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  6220. };

  6221. 

  6222. #if CONFIG_WMV3_DECODER

  6223. AVCodec ff_wmv3_decoder = {

  6224.     .name           = "wmv3",

  6225.     .type           = AVMEDIA_TYPE_VIDEO,

  6226.     .id             = AV_CODEC_ID_WMV3,

  6227.     .priv_data_size = sizeof(VC1Context),

  6228.     .init           = vc1_decode_init,

  6229.     .close          = ff_vc1_decode_end,

  6230.     .decode         = vc1_decode_frame,

  6231.     .flush          = ff_mpeg_flush,

  6232.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  6233.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9"),

  6234.     .pix_fmts       = vc1_hwaccel_pixfmt_list_420,

  6235.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  6236. };

  6237. #endif

  6238. 

  6239. #if CONFIG_WMV3_VDPAU_DECODER

  6240. AVCodec ff_wmv3_vdpau_decoder = {

  6241.     .name           = "wmv3_vdpau",

  6242.     .type           = AVMEDIA_TYPE_VIDEO,

  6243.     .id             = AV_CODEC_ID_WMV3,

  6244.     .priv_data_size = sizeof(VC1Context),

  6245.     .init           = vc1_decode_init,

  6246.     .close          = ff_vc1_decode_end,

  6247.     .decode         = vc1_decode_frame,

  6248.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,

  6249.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 VDPAU"),

  6250.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_WMV3, AV_PIX_FMT_NONE },

  6251.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  6252. };

  6253. #endif

  6254. 

  6255. #if CONFIG_VC1_VDPAU_DECODER

  6256. AVCodec ff_vc1_vdpau_decoder = {

  6257.     .name           = "vc1_vdpau",

  6258.     .type           = AVMEDIA_TYPE_VIDEO,

  6259.     .id             = AV_CODEC_ID_VC1,

  6260.     .priv_data_size = sizeof(VC1Context),

  6261.     .init           = vc1_decode_init,

  6262.     .close          = ff_vc1_decode_end,

  6263.     .decode         = vc1_decode_frame,

  6264.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,

  6265.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1 VDPAU"),

  6266.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_VC1, AV_PIX_FMT_NONE },

  6267.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  6268. };

  6269. #endif

  6270. 

  6271. #if CONFIG_WMV3IMAGE_DECODER

  6272. AVCodec ff_wmv3image_decoder = {

  6273.     .name           = "wmv3image",

  6274.     .type           = AVMEDIA_TYPE_VIDEO,

  6275.     .id             = AV_CODEC_ID_WMV3IMAGE,

  6276.     .priv_data_size = sizeof(VC1Context),

  6277.     .init           = vc1_decode_init,

  6278.     .close          = ff_vc1_decode_end,

  6279.     .decode         = vc1_decode_frame,

  6280.     .capabilities   = CODEC_CAP_DR1,

  6281.     .flush          = vc1_sprite_flush,

  6282.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image"),

  6283.     .pix_fmts       = ff_pixfmt_list_420

  6284. };

  6285. #endif

  6286. 

  6287. #if CONFIG_VC1IMAGE_DECODER

  6288. AVCodec ff_vc1image_decoder = {

  6289.     .name           = "vc1image",

  6290.     .type           = AVMEDIA_TYPE_VIDEO,

  6291.     .id             = AV_CODEC_ID_VC1IMAGE,

  6292.     .priv_data_size = sizeof(VC1Context),

  6293.     .init           = vc1_decode_init,

  6294.     .close          = ff_vc1_decode_end,

  6295.     .decode         = vc1_decode_frame,

  6296.     .capabilities   = CODEC_CAP_DR1,

  6297.     .flush          = vc1_sprite_flush,

  6298.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image v2"),

  6299.     .pix_fmts       = ff_pixfmt_list_420

  6300. };

  6301. #endif