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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 Libav.

  8.  *

  9.  * Libav 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.  * Libav 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 Libav; 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. 

  42. #undef NDEBUG

  43. #include <assert.h>

  44. 

  45. #define MB_INTRA_VLC_BITS 9

  46. #define DC_VLC_BITS 9

  47. 

  48. 

  49. // offset tables for interlaced picture MVDATA decoding

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

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

  52. 

  53. /***********************************************************************/

  54. /**

  55.  * @name VC-1 Bitplane decoding

  56.  * @see 8.7, p56

  57.  * @{

  58.  */

  59. 

  60. /**

  61.  * Imode types

  62.  * @{

  63.  */

  64. enum Imode {

  65.     IMODE_RAW,

  66.     IMODE_NORM2,

  67.     IMODE_DIFF2,

  68.     IMODE_NORM6,

  69.     IMODE_DIFF6,

  70.     IMODE_ROWSKIP,

  71.     IMODE_COLSKIP

  72. };

  73. /** @} */ //imode defines

  74. 

  75. static void init_block_index(VC1Context *v)

  76. {

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

  78.     ff_init_block_index(s);

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

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

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

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

  83.     }

  84. }

  85. 

  86. /** @} */ //Bitplane group

  87. 

  88. static void vc1_put_signed_blocks_clamped(VC1Context *v)

  89. {

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

  91.     int topleft_mb_pos, top_mb_pos;

  92.     int stride_y, fieldtx = 0;

  93.     int v_dist;

  94. 

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

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

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

  98.      * present as well.

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

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

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

  102.     if (!s->first_slice_line) {

  103.         if (s->mb_x) {

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

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

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

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

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

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

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

  111.                                              stride_y);

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

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

  114.                                              stride_y);

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

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

  117.                                              stride_y);

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

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

  120.                                              stride_y);

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

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

  123.                                              s->uvlinesize);

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

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

  126.                                              s->uvlinesize);

  127.         }

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

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

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

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

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

  133.             v_dist     = fieldtx ? 15 : 8;

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

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

  136.                                              stride_y);

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

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

  139.                                              stride_y);

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

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

  142.                                              stride_y);

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

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

  145.                                              stride_y);

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

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

  148.                                              s->uvlinesize);

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

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

  151.                                              s->uvlinesize);

  152.         }

  153.     }

  154. 

  155. #define inc_blk_idx(idx) do { \

  156.         idx++; \

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

  158.             idx = 0; \

  159.     } while (0)

  160. 

  161.     inc_blk_idx(v->topleft_blk_idx);

  162.     inc_blk_idx(v->top_blk_idx);

  163.     inc_blk_idx(v->left_blk_idx);

  164.     inc_blk_idx(v->cur_blk_idx);

  165. }

  166. 

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

  168. {

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

  170.     int j;

  171.     if (!s->first_slice_line) {

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

  173.         if (s->mb_x)

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

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

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

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

  178.             if (s->mb_x)

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

  180.         }

  181.     }

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

  183. 

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

  185.         if (s->mb_x) {

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

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

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

  189.         }

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

  191.     }

  192. }

  193. 

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

  195. {

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

  197.     int j;

  198. 

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

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

  201.     if (!s->first_slice_line) {

  202.         if (s->mb_x) {

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

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

  205. 

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

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

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

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

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

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

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

  213.                     }

  214.                 }

  215.             }

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

  217.         }

  218. 

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

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

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

  222. 

  223.                 if (s->mb_x)

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

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

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

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

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

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

  230.                     }

  231.                 }

  232.             }

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

  234.         }

  235. 

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

  237.             if (s->mb_x) {

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

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

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

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

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

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

  244.                     }

  245.                 }

  246.             }

  247. 

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

  249.                 if (s->mb_x)

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

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

  252.                 if (s->mb_x) {

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

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

  255.                     }

  256.                 }

  257.             }

  258.         }

  259.     }

  260. }

  261. 

  262. static void vc1_smooth_overlap_filter_iblk(VC1Context *v)

  263. {

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

  265.     int mb_pos;

  266. 

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

  268.         return;

  269. 

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

  271. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  291.             }

  292.         }

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

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

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

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

  297. 

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

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

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

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

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

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

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

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

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

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

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

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

  310.                 }

  311.             }

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

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

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

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

  316.         }

  317.     }

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

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

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

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

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

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

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

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

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

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

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

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

  330.             }

  331.         }

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

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

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

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

  336.     }

  337. }

  338. 

  339. /** Do motion compensation over 1 macroblock

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

  341.  */

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

  343. {

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

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

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

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

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

  349.     int i;

  350.     uint8_t (*luty)[256], (*lutuv)[256];

  351.     int use_ic;

  352. 

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

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

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

  356.         return;

  357. 

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

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

  360. 

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

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

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

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

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

  366.         }

  367.     }

  368. 

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

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

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

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

  373. 

  374.     if (v->field_mode &&

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

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

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

  378.     }

  379. 

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

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

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

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

  384.     }

  385.     if (!dir) {

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

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

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

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

  390.             luty  = v->curr_luty;

  391.             lutuv = v->curr_lutuv;

  392.             use_ic = v->curr_use_ic;

  393.         } else {

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

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

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

  397.             luty  = v->last_luty;

  398.             lutuv = v->last_lutuv;

  399.             use_ic = v->last_use_ic;

  400.         }

  401.     } else {

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

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

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

  405.         luty  = v->next_luty;

  406.         lutuv = v->next_lutuv;

  407.         use_ic = v->next_use_ic;

  408.     }

  409. 

  410.     if (!srcY || !srcU) {

  411.         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

  412.         return;

  413.     }

  414. 

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

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

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

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

  419. 

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

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

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

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

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

  425.     } else {

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

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

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

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

  430.     }

  431. 

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

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

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

  435. 

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

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

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

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

  440.     }

  441. 

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

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

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

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

  446.     }

  447. 

  448.     if (v->rangeredfrm || use_ic

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

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

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

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

  453. 

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

  455.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,

  456.                                  s->linesize, s->linesize,

  457.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

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

  459.                                  s->h_edge_pos, v_edge_pos);

  460.         srcY = s->edge_emu_buffer;

  461.         s->vdsp.emulated_edge_mc(uvbuf, srcU,

  462.                                  s->uvlinesize, s->uvlinesize,

  463.                                  8 + 1, 8 + 1,

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

  465.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,

  466.                                  s->uvlinesize, s->uvlinesize,

  467.                                  8 + 1, 8 + 1,

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

  469.         srcU = uvbuf;

  470.         srcV = uvbuf + 16;

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

  472.         if (v->rangeredfrm) {

  473.             int i, j;

  474.             uint8_t *src, *src2;

  475. 

  476.             src = srcY;

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

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

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

  480.                 src += s->linesize;

  481.             }

  482.             src  = srcU;

  483.             src2 = srcV;

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

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

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

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

  488.                 }

  489.                 src  += s->uvlinesize;

  490.                 src2 += s->uvlinesize;

  491.             }

  492.         }

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

  494.         if (use_ic) {

  495.             int i, j;

  496.             uint8_t *src, *src2;

  497. 

  498.             src = srcY;

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

  500.                 int f = v->field_mode ? v->ref_field_type[dir] : ((j + src_y - s->mspel) & 1) ;

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

  502.                     src[i] = luty[f][src[i]];

  503.                 src += s->linesize;

  504.             }

  505.             src  = srcU;

  506.             src2 = srcV;

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

  508.                 int f = v->field_mode ? v->ref_field_type[dir] : ((j + uvsrc_y) & 1);

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

  510.                     src[i]  = lutuv[f][src[i]];

  511.                     src2[i] = lutuv[f][src2[i]];

  512.                 }

  513.                 src  += s->uvlinesize;

  514.                 src2 += s->uvlinesize;

  515.             }

  516.         }

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

  518.     }

  519. 

  520.     if (s->mspel) {

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

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

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

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

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

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

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

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

  529.         if (!v->rnd)

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

  531.         else

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

  533.     }

  534. 

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

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

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

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

  539.     if (!v->rnd) {

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

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

  542.     } else {

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

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

  545.     }

  546. }

  547. 

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

  549. {

  550.     if (a < b) {

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

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

  553.     } else {

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

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

  556.     }

  557. }

  558. 

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

  560.  */

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

  562. {

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

  564.     uint8_t *srcY;

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

  566.     int off;

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

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

  569.     uint8_t (*luty)[256];

  570.     int use_ic;

  571. 

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

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

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

  575.         return;

  576. 

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

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

  579. 

  580.     if (!dir) {

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

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

  583.             luty = v->curr_luty;

  584.             use_ic = v->curr_use_ic;

  585.         } else {

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

  587.             luty = v->last_luty;

  588.             use_ic = v->last_use_ic;

  589.         }

  590.     } else {

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

  592.         luty = v->next_luty;

  593.         use_ic = v->next_use_ic;

  594.     }

  595. 

  596.     if (!srcY) {

  597.         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

  598.         return;

  599.     }

  600. 

  601.     if (v->field_mode) {

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

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

  604.     }

  605. 

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

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

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

  609.         int tx, ty;

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

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

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

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

  614.             opp_count  += f;

  615.             same_count += 1 - f;

  616.         }

  617.         f = opp_count > same_count;

  618.         switch (f ? opp_count : same_count) {

  619.         case 4:

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

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

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

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

  624.             break;

  625.         case 3:

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

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

  628.             break;

  629.         case 2:

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

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

  632.             break;

  633.         }

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

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

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

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

  638.     }

  639. 

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

  641.         int qx, qy;

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

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

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

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

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

  647.         }

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

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

  650. 

  651.         if (qx < -17)

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

  653.         else if (qx > width)

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

  655.         if (qy < -18)

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

  657.         else if (qy > height + 1)

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

  659.     }

  660. 

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

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

  663.     else

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

  665. 

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

  667.     if (!fieldmv)

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

  669.     else

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

  671. 

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

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

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

  675.     } else {

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

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

  678.             if (src_y & 1)

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

  680.             else

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

  682.         } else {

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

  684.         }

  685.     }

  686. 

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

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

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

  690. 

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

  692.         v_edge_pos--;

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

  694.         src_y--;

  695.     if (v->rangeredfrm || use_ic

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

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

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

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

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

  701.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,

  702.                                  s->linesize, s->linesize,

  703.                                  9 + s->mspel * 2, (9 + s->mspel * 2) << fieldmv,

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

  705.                                  s->h_edge_pos, v_edge_pos);

  706.         srcY = s->edge_emu_buffer;

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

  708.         if (v->rangeredfrm) {

  709.             int i, j;

  710.             uint8_t *src;

  711. 

  712.             src = srcY;

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

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

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

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

  717.             }

  718.         }

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

  720.         if (use_ic) {

  721.             int i, j;

  722.             uint8_t *src;

  723. 

  724.             src = srcY;

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

  726.                 int f = v->field_mode ? v->ref_field_type[dir] : (((j<<fieldmv)+src_y - (s->mspel << fieldmv)) & 1);

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

  728.                     src[i] = luty[f][src[i]];

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

  730.             }

  731.         }

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

  733.     }

  734. 

  735.     if (s->mspel) {

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

  737.         if (avg)

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

  739.         else

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

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

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

  743.         if (!v->rnd)

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

  745.         else

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

  747.     }

  748. }

  749. 

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

  751. {

  752.     int idx, i;

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

  754. 

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

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

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

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

  759.     if (!idx) {

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

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

  762.         return 4;

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

  764.         switch (idx) {

  765.         case 0x1:

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

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

  768.             return 3;

  769.         case 0x2:

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

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

  772.             return 3;

  773.         case 0x4:

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

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

  776.             return 3;

  777.         case 0x8:

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

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

  780.             return 3;

  781.         }

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

  783.         int t1 = 0, t2 = 0;

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

  785.             if (!a[i]) {

  786.                 t1 = i;

  787.                 break;

  788.             }

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

  790.             if (!a[i]) {

  791.                 t2 = i;

  792.                 break;

  793.             }

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

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

  796.         return 2;

  797.     } else {

  798.         return 0;

  799.     }

  800.     return -1;

  801. }

  802. 

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

  804.  */

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

  806. {

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

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

  809.     uint8_t *srcU, *srcV;

  810.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

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

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

  813.     int valid_count;

  814.     int chroma_ref_type = v->cur_field_type;

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

  816.     uint8_t (*lutuv)[256];

  817.     int use_ic;

  818. 

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

  820.         return;

  821.     if (s->flags & CODEC_FLAG_GRAY)

  822.         return;

  823. 

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

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

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

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

  828.         if (v->field_mode)

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

  830.     }

  831. 

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

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

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

  835.         chroma_ref_type = v->reffield;

  836.         if (!valid_count) {

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

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

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

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

  841.         }

  842.     } else {

  843.         int dominant = 0;

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

  845.             dominant = 1;

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

  847.         if (dominant)

  848.             chroma_ref_type = !v->cur_field_type;

  849.     }

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

  851.         return;

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

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

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

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

  856. 

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

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

  859. 

  860.     if (v->fastuvmc) {

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

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

  863.     }

  864.     // Field conversion bias

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

  866.         uvmy += 2 - 4 * chroma_ref_type;

  867. 

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

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

  870. 

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

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

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

  874.     } else {

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

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

  877.     }

  878. 

  879.     if (!dir) {

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

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

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

  883.             lutuv = v->curr_lutuv;

  884.             use_ic = v->curr_use_ic;

  885.         } else {

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

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

  888.             lutuv = v->last_lutuv;

  889.             use_ic = v->last_use_ic;

  890.         }

  891.     } else {

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

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

  894.         lutuv = v->next_lutuv;

  895.         use_ic = v->next_use_ic;

  896.     }

  897. 

  898.     if (!srcU) {

  899.         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

  900.         return;

  901.     }

  902. 

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

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

  905. 

  906.     if (v->field_mode) {

  907.         if (chroma_ref_type) {

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

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

  910.         }

  911.     }

  912. 

  913.     if (v->rangeredfrm || use_ic

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

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

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

  917.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU,

  918.                                  s->uvlinesize, s->uvlinesize,

  919.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

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

  922.                                  s->uvlinesize, s->uvlinesize,

  923.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

  925.         srcU = s->edge_emu_buffer;

  926.         srcV = s->edge_emu_buffer + 16;

  927. 

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

  929.         if (v->rangeredfrm) {

  930.             int i, j;

  931.             uint8_t *src, *src2;

  932. 

  933.             src  = srcU;

  934.             src2 = srcV;

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

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

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

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

  939.                 }

  940.                 src  += s->uvlinesize;

  941.                 src2 += s->uvlinesize;

  942.             }

  943.         }

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

  945.         if (use_ic) {

  946.             int i, j;

  947.             uint8_t *src, *src2;

  948. 

  949.             src  = srcU;

  950.             src2 = srcV;

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

  952.                 int f = v->field_mode ? chroma_ref_type : ((j + uvsrc_y) & 1);

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

  954.                     src[i]  = lutuv[f][src[i]];

  955.                     src2[i] = lutuv[f][src2[i]];

  956.                 }

  957.                 src  += s->uvlinesize;

  958.                 src2 += s->uvlinesize;

  959.             }

  960.         }

  961.     }

  962. 

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

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

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

  966.     if (!v->rnd) {

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

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

  969.     } else {

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

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

  972.     }

  973. }

  974. 

  975. /** Do motion compensation for 4-MV interlaced frame chroma macroblock (both U and V)

  976.  */

  977. static void vc1_mc_4mv_chroma4(VC1Context *v, int dir, int dir2, int avg)

  978. {

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

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

  981.     uint8_t *srcU, *srcV;

  982.     int uvsrc_x, uvsrc_y;

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

  984.     int i, off, tx, ty;

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

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

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

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

  989.     int use_ic;

  990.     uint8_t (*lutuv)[256];

  991. 

  992.     if (s->flags & CODEC_FLAG_GRAY)

  993.         return;

  994. 

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

  996.         int d = i < 2 ? dir: dir2;

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

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

  999.         ty = s->mv[d][i][1];

  1000.         if (fieldmv)

  1001.             uvmy_field[i] = (ty >> 4) * 8 + s_rndtblfield[ty & 0xF];

  1002.         else

  1003.             uvmy_field[i] = (ty + ((ty & 3) == 3)) >> 1;

  1004.     }

  1005. 

  1006.     for (i = 0; i < 4; i++) {

  1007.         off = (i & 1) * 4 + ((i & 2) ? v_dist * s->uvlinesize : 0);

  1008.         uvsrc_x = s->mb_x * 8 +  (i & 1) * 4           + (uvmx_field[i] >> 2);

  1009.         uvsrc_y = s->mb_y * 8 + ((i & 2) ? v_dist : 0) + (uvmy_field[i] >> 2);

  1010.         // FIXME: implement proper pull-back (see vc1cropmv.c, vc1CROPMV_ChromaPullBack())

  1011.         uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);

  1012.         uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);

  1013.         if (i < 2 ? dir : dir2) {

  1014.             srcU = s->next_picture.f.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1015.             srcV = s->next_picture.f.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1016.             lutuv  = v->next_lutuv;

  1017.             use_ic = v->next_use_ic;

  1018.         } else {

  1019.             srcU = s->last_picture.f.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1020.             srcV = s->last_picture.f.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  1021.             lutuv  = v->last_lutuv;

  1022.             use_ic = v->last_use_ic;

  1023.         }

  1024.         uvmx_field[i] = (uvmx_field[i] & 3) << 1;

  1025.         uvmy_field[i] = (uvmy_field[i] & 3) << 1;

  1026. 

  1027.         if (fieldmv && !(uvsrc_y & 1))

  1028.             v_edge_pos--;

  1029.         if (fieldmv && (uvsrc_y & 1) && uvsrc_y < 2)

  1030.             uvsrc_y--;

  1031.         if (use_ic

  1032.             || s->h_edge_pos < 10 || v_edge_pos < (5 << fieldmv)

  1033.             || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 5

  1034.             || (unsigned)uvsrc_y > v_edge_pos - (5 << fieldmv)) {

  1035.             s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU,

  1036.                                      s->uvlinesize, s->uvlinesize,

  1037.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

  1038.                                      s->h_edge_pos >> 1, v_edge_pos);

  1039.             s->vdsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV,

  1040.                                      s->uvlinesize, s->uvlinesize,

  1041.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

  1042.                                      s->h_edge_pos >> 1, v_edge_pos);

  1043.             srcU = s->edge_emu_buffer;

  1044.             srcV = s->edge_emu_buffer + 16;

  1045. 

  1046.             /* if we deal with intensity compensation we need to scale source blocks */

  1047.             if (use_ic) {

  1048.                 int i, j;

  1049.                 uint8_t *src, *src2;

  1050. 

  1051.                 src  = srcU;

  1052.                 src2 = srcV;

  1053.                 for (j = 0; j < 5; j++) {

  1054.                     int f = (uvsrc_y + (j << fieldmv)) & 1;

  1055.                     for (i = 0; i < 5; i++) {

  1056.                         src[i]  = lutuv[f][src[i]];

  1057.                         src2[i] = lutuv[f][src2[i]];

  1058.                     }

  1059.                     src  += s->uvlinesize << fieldmv;

  1060.                     src2 += s->uvlinesize << fieldmv;

  1061.                 }

  1062.             }

  1063.         }

  1064.         if (avg) {

  1065.             if (!v->rnd) {

  1066.                 h264chroma->avg_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1067.                 h264chroma->avg_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1068.             } else {

  1069.                 v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1070.                 v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1071.             }

  1072.         } else {

  1073.             if (!v->rnd) {

  1074.                 h264chroma->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1075.                 h264chroma->put_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1076.             } else {

  1077.                 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]);

  1078.                 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]);

  1079.             }

  1080.         }

  1081.     }

  1082. }

  1083. 

  1084. /***********************************************************************/

  1085. /**

  1086.  * @name VC-1 Block-level functions

  1087.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1088.  * @{

  1089.  */

  1090. 

  1091. /**

  1092.  * @def GET_MQUANT

  1093.  * @brief Get macroblock-level quantizer scale

  1094.  */

  1095. #define GET_MQUANT()                                           \

  1096.     if (v->dquantfrm) {                                        \

  1097.         int edges = 0;                                         \

  1098.         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \

  1099.             if (v->dqbilevel) {                                \

  1100.                 mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \

  1101.             } else {                                           \

  1102.                 mqdiff = get_bits(gb, 3);                      \

  1103.                 if (mqdiff != 7)                               \

  1104.                     mquant = v->pq + mqdiff;                   \

  1105.                 else                                           \

  1106.                     mquant = get_bits(gb, 5);                  \

  1107.             }                                                  \

  1108.         }                                                      \

  1109.         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \

  1110.             edges = 1 << v->dqsbedge;                          \

  1111.         else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \

  1112.             edges = (3 << v->dqsbedge) % 15;                   \

  1113.         else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \

  1114.             edges = 15;                                        \

  1115.         if ((edges&1) && !s->mb_x)                             \

  1116.             mquant = v->altpq;                                 \

  1117.         if ((edges&2) && s->first_slice_line)                  \

  1118.             mquant = v->altpq;                                 \

  1119.         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \

  1120.             mquant = v->altpq;                                 \

  1121.         if ((edges&8) && s->mb_y == (s->mb_height - 1))        \

  1122.             mquant = v->altpq;                                 \

  1123.         if (!mquant || mquant > 31) {                          \

  1124.             av_log(v->s.avctx, AV_LOG_ERROR,                   \

  1125.                    "Overriding invalid mquant %d\n", mquant);  \

  1126.             mquant = 1;                                        \

  1127.         }                                                      \

  1128.     }

  1129. 

  1130. /**

  1131.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1132.  * @brief Get MV differentials

  1133.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1134.  * @param _dmv_x Horizontal differential for decoded MV

  1135.  * @param _dmv_y Vertical differential for decoded MV

  1136.  */

  1137. #define GET_MVDATA(_dmv_x, _dmv_y)                                      \

  1138.     index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \

  1139.                          VC1_MV_DIFF_VLC_BITS, 2);                      \

  1140.     if (index > 36) {                                                   \

  1141.         mb_has_coeffs = 1;                                              \

  1142.         index -= 37;                                                    \

  1143.     } else                                                              \

  1144.         mb_has_coeffs = 0;                                              \

  1145.     s->mb_intra = 0;                                                    \

  1146.     if (!index) {                                                       \

  1147.         _dmv_x = _dmv_y = 0;                                            \

  1148.     } else if (index == 35) {                                           \

  1149.         _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1150.         _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1151.     } else if (index == 36) {                                           \

  1152.         _dmv_x = 0;                                                     \

  1153.         _dmv_y = 0;                                                     \

  1154.         s->mb_intra = 1;                                                \

  1155.     } else {                                                            \

  1156.         index1 = index % 6;                                             \

  1157.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1158.         else                                   val = 0;                 \

  1159.         if (size_table[index1] - val > 0)                               \

  1160.             val = get_bits(gb, size_table[index1] - val);               \

  1161.         else                                   val = 0;                 \

  1162.         sign = 0 - (val&1);                                             \

  1163.         _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1164.                                                                         \

  1165.         index1 = index / 6;                                             \

  1166.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1167.         else                                   val = 0;                 \

  1168.         if (size_table[index1] - val > 0)                               \

  1169.             val = get_bits(gb, size_table[index1] - val);               \

  1170.         else                                   val = 0;                 \

  1171.         sign = 0 - (val & 1);                                           \

  1172.         _dmv_y = (sign ^ ((val >> 1) + offset_table[index1])) - sign;   \

  1173.     }

  1174. 

  1175. static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,

  1176.                                                    int *dmv_y, int *pred_flag)

  1177. {

  1178.     int index, index1;

  1179.     int extend_x = 0, extend_y = 0;

  1180.     GetBitContext *gb = &v->s.gb;

  1181.     int bits, esc;

  1182.     int val, sign;

  1183.     const int* offs_tab;

  1184. 

  1185.     if (v->numref) {

  1186.         bits = VC1_2REF_MVDATA_VLC_BITS;

  1187.         esc  = 125;

  1188.     } else {

  1189.         bits = VC1_1REF_MVDATA_VLC_BITS;

  1190.         esc  = 71;

  1191.     }

  1192.     switch (v->dmvrange) {

  1193.     case 1:

  1194.         extend_x = 1;

  1195.         break;

  1196.     case 2:

  1197.         extend_y = 1;

  1198.         break;

  1199.     case 3:

  1200.         extend_x = extend_y = 1;

  1201.         break;

  1202.     }

  1203.     index = get_vlc2(gb, v->imv_vlc->table, bits, 3);

  1204.     if (index == esc) {

  1205.         *dmv_x = get_bits(gb, v->k_x);

  1206.         *dmv_y = get_bits(gb, v->k_y);

  1207.         if (v->numref) {

  1208.             if (pred_flag) {

  1209.                 *pred_flag = *dmv_y & 1;

  1210.                 *dmv_y     = (*dmv_y + *pred_flag) >> 1;

  1211.             } else {

  1212.                 *dmv_y     = (*dmv_y + (*dmv_y & 1)) >> 1;

  1213.             }

  1214.         }

  1215.     }

  1216.     else {

  1217.         if (extend_x)

  1218.             offs_tab = offset_table2;

  1219.         else

  1220.             offs_tab = offset_table1;

  1221.         index1 = (index + 1) % 9;

  1222.         if (index1 != 0) {

  1223.             val    = get_bits(gb, index1 + extend_x);

  1224.             sign   = 0 -(val & 1);

  1225.             *dmv_x = (sign ^ ((val >> 1) + offs_tab[index1])) - sign;

  1226.         } else

  1227.             *dmv_x = 0;

  1228.         if (extend_y)

  1229.             offs_tab = offset_table2;

  1230.         else

  1231.             offs_tab = offset_table1;

  1232.         index1 = (index + 1) / 9;

  1233.         if (index1 > v->numref) {

  1234.             val    = get_bits(gb, (index1 + (extend_y << v->numref)) >> v->numref);

  1235.             sign   = 0 - (val & 1);

  1236.             *dmv_y = (sign ^ ((val >> 1) + offs_tab[index1 >> v->numref])) - sign;

  1237.         } else

  1238.             *dmv_y = 0;

  1239.         if (v->numref && pred_flag)

  1240.             *pred_flag = index1 & 1;

  1241.     }

  1242. }

  1243. 

  1244. static av_always_inline int scaleforsame_x(VC1Context *v, int n /* MV */, int dir)

  1245. {

  1246.     int scaledvalue, refdist;

  1247.     int scalesame1, scalesame2;

  1248.     int scalezone1_x, zone1offset_x;

  1249.     int table_index = dir ^ v->second_field;

  1250. 

  1251.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1252.         refdist = v->refdist;

  1253.     else

  1254.         refdist = dir ? v->brfd : v->frfd;

  1255.     if (refdist > 3)

  1256.         refdist = 3;

  1257.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1258.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1259.     scalezone1_x  = ff_vc1_field_mvpred_scales[table_index][3][refdist];

  1260.     zone1offset_x = ff_vc1_field_mvpred_scales[table_index][5][refdist];

  1261. 

  1262.     if (FFABS(n) > 255)

  1263.         scaledvalue = n;

  1264.     else {

  1265.         if (FFABS(n) < scalezone1_x)

  1266.             scaledvalue = (n * scalesame1) >> 8;

  1267.         else {

  1268.             if (n < 0)

  1269.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_x;

  1270.             else

  1271.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_x;

  1272.         }

  1273.     }

  1274.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1275. }

  1276. 

  1277. static av_always_inline int scaleforsame_y(VC1Context *v, int i, int n /* MV */, int dir)

  1278. {

  1279.     int scaledvalue, refdist;

  1280.     int scalesame1, scalesame2;

  1281.     int scalezone1_y, zone1offset_y;

  1282.     int table_index = dir ^ v->second_field;

  1283. 

  1284.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1285.         refdist = v->refdist;

  1286.     else

  1287.         refdist = dir ? v->brfd : v->frfd;

  1288.     if (refdist > 3)

  1289.         refdist = 3;

  1290.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1291.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1292.     scalezone1_y  = ff_vc1_field_mvpred_scales[table_index][4][refdist];

  1293.     zone1offset_y = ff_vc1_field_mvpred_scales[table_index][6][refdist];

  1294. 

  1295.     if (FFABS(n) > 63)

  1296.         scaledvalue = n;

  1297.     else {

  1298.         if (FFABS(n) < scalezone1_y)

  1299.             scaledvalue = (n * scalesame1) >> 8;

  1300.         else {

  1301.             if (n < 0)

  1302.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_y;

  1303.             else

  1304.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_y;

  1305.         }

  1306.     }

  1307. 

  1308.     if (v->cur_field_type && !v->ref_field_type[dir])

  1309.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1310.     else

  1311.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1312. }

  1313. 

  1314. static av_always_inline int scaleforopp_x(VC1Context *v, int n /* MV */)

  1315. {

  1316.     int scalezone1_x, zone1offset_x;

  1317.     int scaleopp1, scaleopp2, brfd;

  1318.     int scaledvalue;

  1319. 

  1320.     brfd = FFMIN(v->brfd, 3);

  1321.     scalezone1_x  = ff_vc1_b_field_mvpred_scales[3][brfd];

  1322.     zone1offset_x = ff_vc1_b_field_mvpred_scales[5][brfd];

  1323.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1324.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1325. 

  1326.     if (FFABS(n) > 255)

  1327.         scaledvalue = n;

  1328.     else {

  1329.         if (FFABS(n) < scalezone1_x)

  1330.             scaledvalue = (n * scaleopp1) >> 8;

  1331.         else {

  1332.             if (n < 0)

  1333.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_x;

  1334.             else

  1335.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_x;

  1336.         }

  1337.     }

  1338.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1339. }

  1340. 

  1341. static av_always_inline int scaleforopp_y(VC1Context *v, int n /* MV */, int dir)

  1342. {

  1343.     int scalezone1_y, zone1offset_y;

  1344.     int scaleopp1, scaleopp2, brfd;

  1345.     int scaledvalue;

  1346. 

  1347.     brfd = FFMIN(v->brfd, 3);

  1348.     scalezone1_y  = ff_vc1_b_field_mvpred_scales[4][brfd];

  1349.     zone1offset_y = ff_vc1_b_field_mvpred_scales[6][brfd];

  1350.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1351.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1352. 

  1353.     if (FFABS(n) > 63)

  1354.         scaledvalue = n;

  1355.     else {

  1356.         if (FFABS(n) < scalezone1_y)

  1357.             scaledvalue = (n * scaleopp1) >> 8;

  1358.         else {

  1359.             if (n < 0)

  1360.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_y;

  1361.             else

  1362.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_y;

  1363.         }

  1364.     }

  1365.     if (v->cur_field_type && !v->ref_field_type[dir]) {

  1366.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1367.     } else {

  1368.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1369.     }

  1370. }

  1371. 

  1372. static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */,

  1373.                                          int dim, int dir)

  1374. {

  1375.     int brfd, scalesame;

  1376.     int hpel = 1 - v->s.quarter_sample;

  1377. 

  1378.     n >>= hpel;

  1379.     if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {

  1380.         if (dim)

  1381.             n = scaleforsame_y(v, i, n, dir) << hpel;

  1382.         else

  1383.             n = scaleforsame_x(v, n, dir) << hpel;

  1384.         return n;

  1385.     }

  1386.     brfd      = FFMIN(v->brfd, 3);

  1387.     scalesame = ff_vc1_b_field_mvpred_scales[0][brfd];

  1388. 

  1389.     n = (n * scalesame >> 8) << hpel;

  1390.     return n;

  1391. }

  1392. 

  1393. static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */,

  1394.                                         int dim, int dir)

  1395. {

  1396.     int refdist, scaleopp;

  1397.     int hpel = 1 - v->s.quarter_sample;

  1398. 

  1399.     n >>= hpel;

  1400.     if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) {

  1401.         if (dim)

  1402.             n = scaleforopp_y(v, n, dir) << hpel;

  1403.         else

  1404.             n = scaleforopp_x(v, n) << hpel;

  1405.         return n;

  1406.     }

  1407.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1408.         refdist = FFMIN(v->refdist, 3);

  1409.     else

  1410.         refdist = dir ? v->brfd : v->frfd;

  1411.     scaleopp = ff_vc1_field_mvpred_scales[dir ^ v->second_field][0][refdist];

  1412. 

  1413.     n = (n * scaleopp >> 8) << hpel;

  1414.     return n;

  1415. }

  1416. 

  1417. /** Predict and set motion vector

  1418.  */

  1419. static inline void vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,

  1420.                                int mv1, int r_x, int r_y, uint8_t* is_intra,

  1421.                                int pred_flag, int dir)

  1422. {

  1423.     MpegEncContext *s = &v->s;

  1424.     int xy, wrap, off = 0;

  1425.     int16_t *A, *B, *C;

  1426.     int px, py;

  1427.     int sum;

  1428.     int mixedmv_pic, num_samefield = 0, num_oppfield = 0;

  1429.     int opposite, a_f, b_f, c_f;

  1430.     int16_t field_predA[2];

  1431.     int16_t field_predB[2];

  1432.     int16_t field_predC[2];

  1433.     int a_valid, b_valid, c_valid;

  1434.     int hybridmv_thresh, y_bias = 0;

  1435. 

  1436.     if (v->mv_mode == MV_PMODE_MIXED_MV ||

  1437.         ((v->mv_mode == MV_PMODE_INTENSITY_COMP) && (v->mv_mode2 == MV_PMODE_MIXED_MV)))

  1438.         mixedmv_pic = 1;

  1439.     else

  1440.         mixedmv_pic = 0;

  1441.     /* scale MV difference to be quad-pel */

  1442.     dmv_x <<= 1 - s->quarter_sample;

  1443.     dmv_y <<= 1 - s->quarter_sample;

  1444. 

  1445.     wrap = s->b8_stride;

  1446.     xy   = s->block_index[n];

  1447. 

  1448.     if (s->mb_intra) {

  1449.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy + v->blocks_off][0] = 0;

  1450.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy + v->blocks_off][1] = 0;

  1451.         s->current_picture.motion_val[1][xy + v->blocks_off][0] = 0;

  1452.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = 0;

  1453.         if (mv1) { /* duplicate motion data for 1-MV block */

  1454.             s->current_picture.motion_val[0][xy + 1 + v->blocks_off][0]        = 0;

  1455.             s->current_picture.motion_val[0][xy + 1 + v->blocks_off][1]        = 0;

  1456.             s->current_picture.motion_val[0][xy + wrap + v->blocks_off][0]     = 0;

  1457.             s->current_picture.motion_val[0][xy + wrap + v->blocks_off][1]     = 0;

  1458.             s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][0] = 0;

  1459.             s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][1] = 0;

  1460.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  1461.             s->current_picture.motion_val[1][xy + 1 + v->blocks_off][0]        = 0;

  1462.             s->current_picture.motion_val[1][xy + 1 + v->blocks_off][1]        = 0;

  1463.             s->current_picture.motion_val[1][xy + wrap][0]                     = 0;

  1464.             s->current_picture.motion_val[1][xy + wrap + v->blocks_off][1]     = 0;

  1465.             s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][0] = 0;

  1466.             s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][1] = 0;

  1467.         }

  1468.         return;

  1469.     }

  1470. 

  1471.     C = s->current_picture.motion_val[dir][xy -    1 + v->blocks_off];

  1472.     A = s->current_picture.motion_val[dir][xy - wrap + v->blocks_off];

  1473.     if (mv1) {

  1474.         if (v->field_mode && mixedmv_pic)

  1475.             off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1476.         else

  1477.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1478.     } else {

  1479.         //in 4-MV mode different blocks have different B predictor position

  1480.         switch (n) {

  1481.         case 0:

  1482.             off = (s->mb_x > 0) ? -1 : 1;

  1483.             break;

  1484.         case 1:

  1485.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1486.             break;

  1487.         case 2:

  1488.             off = 1;

  1489.             break;

  1490.         case 3:

  1491.             off = -1;

  1492.         }

  1493.     }

  1494.     B = s->current_picture.motion_val[dir][xy - wrap + off + v->blocks_off];

  1495. 

  1496.     a_valid = !s->first_slice_line || (n == 2 || n == 3);

  1497.     b_valid = a_valid && (s->mb_width > 1);

  1498.     c_valid = s->mb_x || (n == 1 || n == 3);

  1499.     if (v->field_mode) {

  1500.         a_valid = a_valid && !is_intra[xy - wrap];

  1501.         b_valid = b_valid && !is_intra[xy - wrap + off];

  1502.         c_valid = c_valid && !is_intra[xy - 1];

  1503.     }

  1504. 

  1505.     if (a_valid) {

  1506.         a_f = v->mv_f[dir][xy - wrap + v->blocks_off];

  1507.         num_oppfield  += a_f;

  1508.         num_samefield += 1 - a_f;

  1509.         field_predA[0] = A[0];

  1510.         field_predA[1] = A[1];

  1511.     } else {

  1512.         field_predA[0] = field_predA[1] = 0;

  1513.         a_f = 0;

  1514.     }

  1515.     if (b_valid) {

  1516.         b_f = v->mv_f[dir][xy - wrap + off + v->blocks_off];

  1517.         num_oppfield  += b_f;

  1518.         num_samefield += 1 - b_f;

  1519.         field_predB[0] = B[0];

  1520.         field_predB[1] = B[1];

  1521.     } else {

  1522.         field_predB[0] = field_predB[1] = 0;

  1523.         b_f = 0;

  1524.     }

  1525.     if (c_valid) {

  1526.         c_f = v->mv_f[dir][xy - 1 + v->blocks_off];

  1527.         num_oppfield  += c_f;

  1528.         num_samefield += 1 - c_f;

  1529.         field_predC[0] = C[0];

  1530.         field_predC[1] = C[1];

  1531.     } else {

  1532.         field_predC[0] = field_predC[1] = 0;

  1533.         c_f = 0;

  1534.     }

  1535. 

  1536.     if (v->field_mode) {

  1537.         if (!v->numref)

  1538.             // REFFIELD determines if the last field or the second-last field is

  1539.             // to be used as reference

  1540.             opposite = 1 - v->reffield;

  1541.         else {

  1542.             if (num_samefield <= num_oppfield)

  1543.                 opposite = 1 - pred_flag;

  1544.             else

  1545.                 opposite = pred_flag;

  1546.         }

  1547.     } else

  1548.         opposite = 0;

  1549.     if (opposite) {

  1550.         if (a_valid && !a_f) {

  1551.             field_predA[0] = scaleforopp(v, field_predA[0], 0, dir);

  1552.             field_predA[1] = scaleforopp(v, field_predA[1], 1, dir);

  1553.         }

  1554.         if (b_valid && !b_f) {

  1555.             field_predB[0] = scaleforopp(v, field_predB[0], 0, dir);

  1556.             field_predB[1] = scaleforopp(v, field_predB[1], 1, dir);

  1557.         }

  1558.         if (c_valid && !c_f) {

  1559.             field_predC[0] = scaleforopp(v, field_predC[0], 0, dir);

  1560.             field_predC[1] = scaleforopp(v, field_predC[1], 1, dir);

  1561.         }

  1562.         v->mv_f[dir][xy + v->blocks_off] = 1;

  1563.         v->ref_field_type[dir] = !v->cur_field_type;

  1564.     } else {

  1565.         if (a_valid && a_f) {

  1566.             field_predA[0] = scaleforsame(v, n, field_predA[0], 0, dir);

  1567.             field_predA[1] = scaleforsame(v, n, field_predA[1], 1, dir);

  1568.         }

  1569.         if (b_valid && b_f) {

  1570.             field_predB[0] = scaleforsame(v, n, field_predB[0], 0, dir);

  1571.             field_predB[1] = scaleforsame(v, n, field_predB[1], 1, dir);

  1572.         }

  1573.         if (c_valid && c_f) {

  1574.             field_predC[0] = scaleforsame(v, n, field_predC[0], 0, dir);

  1575.             field_predC[1] = scaleforsame(v, n, field_predC[1], 1, dir);

  1576.         }

  1577.         v->mv_f[dir][xy + v->blocks_off] = 0;

  1578.         v->ref_field_type[dir] = v->cur_field_type;

  1579.     }

  1580. 

  1581.     if (a_valid) {

  1582.         px = field_predA[0];

  1583.         py = field_predA[1];

  1584.     } else if (c_valid) {

  1585.         px = field_predC[0];

  1586.         py = field_predC[1];

  1587.     } else if (b_valid) {

  1588.         px = field_predB[0];

  1589.         py = field_predB[1];

  1590.     } else {

  1591.         px = 0;

  1592.         py = 0;

  1593.     }

  1594. 

  1595.     if (num_samefield + num_oppfield > 1) {

  1596.         px = mid_pred(field_predA[0], field_predB[0], field_predC[0]);

  1597.         py = mid_pred(field_predA[1], field_predB[1], field_predC[1]);

  1598.     }

  1599. 

  1600.     /* Pullback MV as specified in 8.3.5.3.4 */

  1601.     if (!v->field_mode) {

  1602.         int qx, qy, X, Y;

  1603.         qx = (s->mb_x << 6) + ((n == 1 || n == 3) ? 32 : 0);

  1604.         qy = (s->mb_y << 6) + ((n == 2 || n == 3) ? 32 : 0);

  1605.         X  = (s->mb_width  << 6) - 4;

  1606.         Y  = (s->mb_height << 6) - 4;

  1607.         if (mv1) {

  1608.             if (qx + px < -60) px = -60 - qx;

  1609.             if (qy + py < -60) py = -60 - qy;

  1610.         } else {

  1611.             if (qx + px < -28) px = -28 - qx;

  1612.             if (qy + py < -28) py = -28 - qy;

  1613.         }

  1614.         if (qx + px > X) px = X - qx;

  1615.         if (qy + py > Y) py = Y - qy;

  1616.     }

  1617. 

  1618.     if (!v->field_mode || s->pict_type != AV_PICTURE_TYPE_B) {

  1619.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 (also 10.3.5.4.3.5) */

  1620.         hybridmv_thresh = 32;

  1621.         if (a_valid && c_valid) {

  1622.             if (is_intra[xy - wrap])

  1623.                 sum = FFABS(px) + FFABS(py);

  1624.             else

  1625.                 sum = FFABS(px - field_predA[0]) + FFABS(py - field_predA[1]);

  1626.             if (sum > hybridmv_thresh) {

  1627.                 if (get_bits1(&s->gb)) {     // read HYBRIDPRED bit

  1628.                     px = field_predA[0];

  1629.                     py = field_predA[1];

  1630.                 } else {

  1631.                     px = field_predC[0];

  1632.                     py = field_predC[1];

  1633.                 }

  1634.             } else {

  1635.                 if (is_intra[xy - 1])

  1636.                     sum = FFABS(px) + FFABS(py);

  1637.                 else

  1638.                     sum = FFABS(px - field_predC[0]) + FFABS(py - field_predC[1]);

  1639.                 if (sum > hybridmv_thresh) {

  1640.                     if (get_bits1(&s->gb)) {

  1641.                         px = field_predA[0];

  1642.                         py = field_predA[1];

  1643.                     } else {

  1644.                         px = field_predC[0];

  1645.                         py = field_predC[1];

  1646.                     }

  1647.                 }

  1648.             }

  1649.         }

  1650.     }

  1651. 

  1652.     if (v->field_mode && v->numref)

  1653.         r_y >>= 1;

  1654.     if (v->field_mode && v->cur_field_type && v->ref_field_type[dir] == 0)

  1655.         y_bias = 1;

  1656.     /* store MV using signed modulus of MV range defined in 4.11 */

  1657.     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;

  1658.     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;

  1659.     if (mv1) { /* duplicate motion data for 1-MV block */

  1660.         s->current_picture.motion_val[dir][xy +    1 +     v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1661.         s->current_picture.motion_val[dir][xy +    1 +     v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1662.         s->current_picture.motion_val[dir][xy + wrap +     v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1663.         s->current_picture.motion_val[dir][xy + wrap +     v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1664.         s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1665.         s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1666.         v->mv_f[dir][xy +    1 + v->blocks_off] = v->mv_f[dir][xy +            v->blocks_off];

  1667.         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];

  1668.     }

  1669. }

  1670. 

  1671. /** Predict and set motion vector for interlaced frame picture MBs

  1672.  */

  1673. static inline void vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,

  1674.                                      int mvn, int r_x, int r_y, uint8_t* is_intra, int dir)

  1675. {

  1676.     MpegEncContext *s = &v->s;

  1677.     int xy, wrap, off = 0;

  1678.     int A[2], B[2], C[2];

  1679.     int px, py;

  1680.     int a_valid = 0, b_valid = 0, c_valid = 0;

  1681.     int field_a, field_b, field_c; // 0: same, 1: opposit

  1682.     int total_valid, num_samefield, num_oppfield;

  1683.     int pos_c, pos_b, n_adj;

  1684. 

  1685.     wrap = s->b8_stride;

  1686.     xy = s->block_index[n];

  1687. 

  1688.     if (s->mb_intra) {

  1689.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1690.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1691.         s->current_picture.motion_val[1][xy][0] = 0;

  1692.         s->current_picture.motion_val[1][xy][1] = 0;

  1693.         if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1694.             s->current_picture.motion_val[0][xy + 1][0]        = 0;

  1695.             s->current_picture.motion_val[0][xy + 1][1]        = 0;

  1696.             s->current_picture.motion_val[0][xy + wrap][0]     = 0;

  1697.             s->current_picture.motion_val[0][xy + wrap][1]     = 0;

  1698.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1699.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1700.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  1701.             s->current_picture.motion_val[1][xy + 1][0]        = 0;

  1702.             s->current_picture.motion_val[1][xy + 1][1]        = 0;

  1703.             s->current_picture.motion_val[1][xy + wrap][0]     = 0;

  1704.             s->current_picture.motion_val[1][xy + wrap][1]     = 0;

  1705.             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;

  1706.             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

  1707.         }

  1708.         return;

  1709.     }

  1710. 

  1711.     off = ((n == 0) || (n == 1)) ? 1 : -1;

  1712.     /* predict A */

  1713.     if (s->mb_x || (n == 1) || (n == 3)) {

  1714.         if ((v->blk_mv_type[xy]) // current block (MB) has a field MV

  1715.             || (!v->blk_mv_type[xy] && !v->blk_mv_type[xy - 1])) { // or both have frame MV

  1716.             A[0] = s->current_picture.motion_val[dir][xy - 1][0];

  1717.             A[1] = s->current_picture.motion_val[dir][xy - 1][1];

  1718.             a_valid = 1;

  1719.         } else { // current block has frame mv and cand. has field MV (so average)

  1720.             A[0] = (s->current_picture.motion_val[dir][xy - 1][0]

  1721.                     + s->current_picture.motion_val[dir][xy - 1 + off * wrap][0] + 1) >> 1;

  1722.             A[1] = (s->current_picture.motion_val[dir][xy - 1][1]

  1723.                     + s->current_picture.motion_val[dir][xy - 1 + off * wrap][1] + 1) >> 1;

  1724.             a_valid = 1;

  1725.         }

  1726.         if (!(n & 1) && v->is_intra[s->mb_x - 1]) {

  1727.             a_valid = 0;

  1728.             A[0] = A[1] = 0;

  1729.         }

  1730.     } else

  1731.         A[0] = A[1] = 0;

  1732.     /* Predict B and C */

  1733.     B[0] = B[1] = C[0] = C[1] = 0;

  1734.     if (n == 0 || n == 1 || v->blk_mv_type[xy]) {

  1735.         if (!s->first_slice_line) {

  1736.             if (!v->is_intra[s->mb_x - s->mb_stride]) {

  1737.                 b_valid = 1;

  1738.                 n_adj   = n | 2;

  1739.                 pos_b   = s->block_index[n_adj] - 2 * wrap;

  1740.                 if (v->blk_mv_type[pos_b] && v->blk_mv_type[xy]) {

  1741.                     n_adj = (n & 2) | (n & 1);

  1742.                 }

  1743.                 B[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap][0];

  1744.                 B[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap][1];

  1745.                 if (v->blk_mv_type[pos_b] && !v->blk_mv_type[xy]) {

  1746.                     B[0] = (B[0] + s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap][0] + 1) >> 1;

  1747.                     B[1] = (B[1] + s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap][1] + 1) >> 1;

  1748.                 }

  1749.             }

  1750.             if (s->mb_width > 1) {

  1751.                 if (!v->is_intra[s->mb_x - s->mb_stride + 1]) {

  1752.                     c_valid = 1;

  1753.                     n_adj   = 2;

  1754.                     pos_c   = s->block_index[2] - 2 * wrap + 2;

  1755.                     if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1756.                         n_adj = n & 2;

  1757.                     }

  1758.                     C[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap + 2][0];

  1759.                     C[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap + 2][1];

  1760.                     if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1761.                         C[0] = (1 + C[0] + (s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap + 2][0])) >> 1;

  1762.                         C[1] = (1 + C[1] + (s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap + 2][1])) >> 1;

  1763.                     }

  1764.                     if (s->mb_x == s->mb_width - 1) {

  1765.                         if (!v->is_intra[s->mb_x - s->mb_stride - 1]) {

  1766.                             c_valid = 1;

  1767.                             n_adj   = 3;

  1768.                             pos_c   = s->block_index[3] - 2 * wrap - 2;

  1769.                             if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1770.                                 n_adj = n | 1;

  1771.                             }

  1772.                             C[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap - 2][0];

  1773.                             C[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap - 2][1];

  1774.                             if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1775.                                 C[0] = (1 + C[0] + s->current_picture.motion_val[dir][s->block_index[1] - 2 * wrap - 2][0]) >> 1;

  1776.                                 C[1] = (1 + C[1] + s->current_picture.motion_val[dir][s->block_index[1] - 2 * wrap - 2][1]) >> 1;

  1777.                             }

  1778.                         } else

  1779.                             c_valid = 0;

  1780.                     }

  1781.                 }

  1782.             }

  1783.         }

  1784.     } else {

  1785.         pos_b   = s->block_index[1];

  1786.         b_valid = 1;

  1787.         B[0]    = s->current_picture.motion_val[dir][pos_b][0];

  1788.         B[1]    = s->current_picture.motion_val[dir][pos_b][1];

  1789.         pos_c   = s->block_index[0];

  1790.         c_valid = 1;

  1791.         C[0]    = s->current_picture.motion_val[dir][pos_c][0];

  1792.         C[1]    = s->current_picture.motion_val[dir][pos_c][1];

  1793.     }

  1794. 

  1795.     total_valid = a_valid + b_valid + c_valid;

  1796.     // check if predictor A is out of bounds

  1797.     if (!s->mb_x && !(n == 1 || n == 3)) {

  1798.         A[0] = A[1] = 0;

  1799.     }

  1800.     // check if predictor B is out of bounds

  1801.     if ((s->first_slice_line && v->blk_mv_type[xy]) || (s->first_slice_line && !(n & 2))) {

  1802.         B[0] = B[1] = C[0] = C[1] = 0;

  1803.     }

  1804.     if (!v->blk_mv_type[xy]) {

  1805.         if (s->mb_width == 1) {

  1806.             px = B[0];

  1807.             py = B[1];

  1808.         } else {

  1809.             if (total_valid >= 2) {

  1810.                 px = mid_pred(A[0], B[0], C[0]);

  1811.                 py = mid_pred(A[1], B[1], C[1]);

  1812.             } else if (total_valid) {

  1813.                 if (a_valid) { px = A[0]; py = A[1]; }

  1814.                 if (b_valid) { px = B[0]; py = B[1]; }

  1815.                 if (c_valid) { px = C[0]; py = C[1]; }

  1816.             } else

  1817.                 px = py = 0;

  1818.         }

  1819.     } else {

  1820.         if (a_valid)

  1821.             field_a = (A[1] & 4) ? 1 : 0;

  1822.         else

  1823.             field_a = 0;

  1824.         if (b_valid)

  1825.             field_b = (B[1] & 4) ? 1 : 0;

  1826.         else

  1827.             field_b = 0;

  1828.         if (c_valid)

  1829.             field_c = (C[1] & 4) ? 1 : 0;

  1830.         else

  1831.             field_c = 0;

  1832. 

  1833.         num_oppfield  = field_a + field_b + field_c;

  1834.         num_samefield = total_valid - num_oppfield;

  1835.         if (total_valid == 3) {

  1836.             if ((num_samefield == 3) || (num_oppfield == 3)) {

  1837.                 px = mid_pred(A[0], B[0], C[0]);

  1838.                 py = mid_pred(A[1], B[1], C[1]);

  1839.             } else if (num_samefield >= num_oppfield) {

  1840.                 /* take one MV from same field set depending on priority

  1841.                 the check for B may not be necessary */

  1842.                 px = !field_a ? A[0] : B[0];

  1843.                 py = !field_a ? A[1] : B[1];

  1844.             } else {

  1845.                 px =  field_a ? A[0] : B[0];

  1846.                 py =  field_a ? A[1] : B[1];

  1847.             }

  1848.         } else if (total_valid == 2) {

  1849.             if (num_samefield >= num_oppfield) {

  1850.                 if (!field_a && a_valid) {

  1851.                     px = A[0];

  1852.                     py = A[1];

  1853.                 } else if (!field_b && b_valid) {

  1854.                     px = B[0];

  1855.                     py = B[1];

  1856.                 } else if (c_valid) {

  1857.                     px = C[0];

  1858.                     py = C[1];

  1859.                 } else px = py = 0;

  1860.             } else {

  1861.                 if (field_a && a_valid) {

  1862.                     px = A[0];

  1863.                     py = A[1];

  1864.                 } else if (field_b && b_valid) {

  1865.                     px = B[0];

  1866.                     py = B[1];

  1867.                 } else if (c_valid) {

  1868.                     px = C[0];

  1869.                     py = C[1];

  1870.                 }

  1871.             }

  1872.         } else if (total_valid == 1) {

  1873.             px = (a_valid) ? A[0] : ((b_valid) ? B[0] : C[0]);

  1874.             py = (a_valid) ? A[1] : ((b_valid) ? B[1] : C[1]);

  1875.         } else

  1876.             px = py = 0;

  1877.     }

  1878. 

  1879.     /* store MV using signed modulus of MV range defined in 4.11 */

  1880.     s->mv[dir][n][0] = s->current_picture.motion_val[dir][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1881.     s->mv[dir][n][1] = s->current_picture.motion_val[dir][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1882.     if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1883.         s->current_picture.motion_val[dir][xy +    1    ][0] = s->current_picture.motion_val[dir][xy][0];

  1884.         s->current_picture.motion_val[dir][xy +    1    ][1] = s->current_picture.motion_val[dir][xy][1];

  1885.         s->current_picture.motion_val[dir][xy + wrap    ][0] = s->current_picture.motion_val[dir][xy][0];

  1886.         s->current_picture.motion_val[dir][xy + wrap    ][1] = s->current_picture.motion_val[dir][xy][1];

  1887.         s->current_picture.motion_val[dir][xy + wrap + 1][0] = s->current_picture.motion_val[dir][xy][0];

  1888.         s->current_picture.motion_val[dir][xy + wrap + 1][1] = s->current_picture.motion_val[dir][xy][1];

  1889.     } else if (mvn == 2) { /* duplicate motion data for 2-Field MV block */

  1890.         s->current_picture.motion_val[dir][xy + 1][0] = s->current_picture.motion_val[dir][xy][0];

  1891.         s->current_picture.motion_val[dir][xy + 1][1] = s->current_picture.motion_val[dir][xy][1];

  1892.         s->mv[dir][n + 1][0] = s->mv[dir][n][0];

  1893.         s->mv[dir][n + 1][1] = s->mv[dir][n][1];

  1894.     }

  1895. }

  1896. 

  1897. /** Motion compensation for direct or interpolated blocks in B-frames

  1898.  */

  1899. static void vc1_interp_mc(VC1Context *v)

  1900. {

  1901.     MpegEncContext *s = &v->s;

  1902.     H264ChromaContext *h264chroma = &v->h264chroma;

  1903.     uint8_t *srcY, *srcU, *srcV;

  1904.     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1905.     int off, off_uv;

  1906.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  1907.     int use_ic = v->next_use_ic;

  1908. 

  1909.     if (!v->field_mode && !v->s.next_picture.f.data[0])

  1910.         return;

  1911. 

  1912.     mx   = s->mv[1][0][0];

  1913.     my   = s->mv[1][0][1];

  1914.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1915.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1916.     if (v->field_mode) {

  1917.         if (v->cur_field_type != v->ref_field_type[1])

  1918.             my   = my   - 2 + 4 * v->cur_field_type;

  1919.             uvmy = uvmy - 2 + 4 * v->cur_field_type;

  1920.     }

  1921.     if (v->fastuvmc) {

  1922.         uvmx = uvmx + ((uvmx < 0) ? -(uvmx & 1) : (uvmx & 1));

  1923.         uvmy = uvmy + ((uvmy < 0) ? -(uvmy & 1) : (uvmy & 1));

  1924.     }

  1925.     srcY = s->next_picture.f.data[0];

  1926.     srcU = s->next_picture.f.data[1];

  1927.     srcV = s->next_picture.f.data[2];

  1928. 

  1929.     src_x   = s->mb_x * 16 + (mx   >> 2);

  1930.     src_y   = s->mb_y * 16 + (my   >> 2);

  1931.     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);

  1932.     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

  1933. 

  1934.     if (v->profile != PROFILE_ADVANCED) {

  1935.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1936.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1937.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1938.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1939.     } else {

  1940.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1941.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1942.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1943.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1944.     }

  1945. 

  1946.     srcY += src_y   * s->linesize   + src_x;

  1947.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1948.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1949. 

  1950.     if (v->field_mode && v->ref_field_type[1]) {

  1951.         srcY += s->current_picture_ptr->f.linesize[0];

  1952.         srcU += s->current_picture_ptr->f.linesize[1];

  1953.         srcV += s->current_picture_ptr->f.linesize[2];

  1954.     }

  1955. 

  1956.     /* for grayscale we should not try to read from unknown area */

  1957.     if (s->flags & CODEC_FLAG_GRAY) {

  1958.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1959.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1960.     }

  1961. 

  1962.     if (v->rangeredfrm || s->h_edge_pos < 22 || v_edge_pos < 22 || use_ic

  1963.         || (unsigned)(src_x - 1) > s->h_edge_pos - (mx & 3) - 16 - 3

  1964.         || (unsigned)(src_y - 1) > v_edge_pos    - (my & 3) - 16 - 3) {

  1965.         uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

  1966. 

  1967.         srcY -= s->mspel * (1 + s->linesize);

  1968.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,

  1969.                                  s->linesize, s->linesize,

  1970.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

  1971.                                  src_x - s->mspel, src_y - s->mspel,

  1972.                                  s->h_edge_pos, v_edge_pos);

  1973.         srcY = s->edge_emu_buffer;

  1974.         s->vdsp.emulated_edge_mc(uvbuf, srcU,

  1975.                                  s->uvlinesize, s->uvlinesize,

  1976.                                  8 + 1, 8 + 1,

  1977.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1978.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,

  1979.                                  s->uvlinesize, s->uvlinesize,

  1980.                                  8 + 1, 8 + 1,

  1981.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1982.         srcU = uvbuf;

  1983.         srcV = uvbuf + 16;

  1984.         /* if we deal with range reduction we need to scale source blocks */

  1985.         if (v->rangeredfrm) {

  1986.             int i, j;

  1987.             uint8_t *src, *src2;

  1988. 

  1989.             src = srcY;

  1990.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  1991.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  1992.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1993.                 src += s->linesize;

  1994.             }

  1995.             src = srcU;

  1996.             src2 = srcV;

  1997.             for (j = 0; j < 9; j++) {

  1998.                 for (i = 0; i < 9; i++) {

  1999.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  2000.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  2001.                 }

  2002.                 src  += s->uvlinesize;

  2003.                 src2 += s->uvlinesize;

  2004.             }

  2005.         }

  2006. 

  2007.         if (use_ic) {

  2008.             uint8_t (*luty )[256] = v->next_luty;

  2009.             uint8_t (*lutuv)[256] = v->next_lutuv;

  2010.             int i, j;

  2011.             uint8_t *src, *src2;

  2012. 

  2013.             src = srcY;

  2014.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  2015.                 int f = v->field_mode ? v->ref_field_type[1] : ((j+src_y - s->mspel) & 1);

  2016.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  2017.                     src[i] = luty[f][src[i]];

  2018.                 src += s->linesize;

  2019.             }

  2020.             src  = srcU;

  2021.             src2 = srcV;

  2022.             for (j = 0; j < 9; j++) {

  2023.                 int f = v->field_mode ? v->ref_field_type[1] : ((j+uvsrc_y) & 1);

  2024.                 for (i = 0; i < 9; i++) {

  2025.                     src[i]  = lutuv[f][src[i]];

  2026.                     src2[i] = lutuv[f][src2[i]];

  2027.                 }

  2028.                 src  += s->uvlinesize;

  2029.                 src2 += s->uvlinesize;

  2030.             }

  2031.         }

  2032.         srcY += s->mspel * (1 + s->linesize);

  2033.     }

  2034. 

  2035.     off    = 0;

  2036.     off_uv = 0;

  2037. 

  2038.     if (s->mspel) {

  2039.         dxy = ((my & 3) << 2) | (mx & 3);

  2040.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);

  2041.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);

  2042.         srcY += s->linesize * 8;

  2043.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  2044.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  2045.     } else { // hpel mc

  2046.         dxy = (my & 2) | ((mx & 2) >> 1);

  2047. 

  2048.         if (!v->rnd)

  2049.             s->hdsp.avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  2050.         else

  2051.             s->hdsp.avg_no_rnd_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize, 16);

  2052.     }

  2053. 

  2054.     if (s->flags & CODEC_FLAG_GRAY) return;

  2055.     /* Chroma MC always uses qpel blilinear */

  2056.     uvmx = (uvmx & 3) << 1;

  2057.     uvmy = (uvmy & 3) << 1;

  2058.     if (!v->rnd) {

  2059.         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  2060.         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  2061.     } else {

  2062.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  2063.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  2064.     }

  2065. }

  2066. 

  2067. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  2068. {

  2069.     int n = bfrac;

  2070. 

  2071. #if B_FRACTION_DEN==256

  2072.     if (inv)

  2073.         n -= 256;

  2074.     if (!qs)

  2075.         return 2 * ((value * n + 255) >> 9);

  2076.     return (value * n + 128) >> 8;

  2077. #else

  2078.     if (inv)

  2079.         n -= B_FRACTION_DEN;

  2080.     if (!qs)

  2081.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  2082.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  2083. #endif

  2084. }

  2085. 

  2086. /** Reconstruct motion vector for B-frame and do motion compensation

  2087.  */

  2088. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],

  2089.                             int direct, int mode)

  2090. {

  2091.     if (direct) {

  2092.         vc1_mc_1mv(v, 0);

  2093.         vc1_interp_mc(v);

  2094.         return;

  2095.     }

  2096.     if (mode == BMV_TYPE_INTERPOLATED) {

  2097.         vc1_mc_1mv(v, 0);

  2098.         vc1_interp_mc(v);

  2099.         return;

  2100.     }

  2101. 

  2102.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  2103. }

  2104. 

  2105. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],

  2106.                                  int direct, int mvtype)

  2107. {

  2108.     MpegEncContext *s = &v->s;

  2109.     int xy, wrap, off = 0;

  2110.     int16_t *A, *B, *C;

  2111.     int px, py;

  2112.     int sum;

  2113.     int r_x, r_y;

  2114.     const uint8_t *is_intra = v->mb_type[0];

  2115. 

  2116.     r_x = v->range_x;

  2117.     r_y = v->range_y;

  2118.     /* scale MV difference to be quad-pel */

  2119.     dmv_x[0] <<= 1 - s->quarter_sample;

  2120.     dmv_y[0] <<= 1 - s->quarter_sample;

  2121.     dmv_x[1] <<= 1 - s->quarter_sample;

  2122.     dmv_y[1] <<= 1 - s->quarter_sample;

  2123. 

  2124.     wrap = s->b8_stride;

  2125.     xy = s->block_index[0];

  2126. 

  2127.     if (s->mb_intra) {

  2128.         s->current_picture.motion_val[0][xy + v->blocks_off][0] =

  2129.         s->current_picture.motion_val[0][xy + v->blocks_off][1] =

  2130.         s->current_picture.motion_val[1][xy + v->blocks_off][0] =

  2131.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = 0;

  2132.         return;

  2133.     }

  2134.     if (!v->field_mode) {

  2135.         s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  2136.         s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  2137.         s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  2138.         s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  2139. 

  2140.         /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  2141.         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));

  2142.         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));

  2143.         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));

  2144.         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));

  2145.     }

  2146.     if (direct) {

  2147.         s->current_picture.motion_val[0][xy + v->blocks_off][0] = s->mv[0][0][0];

  2148.         s->current_picture.motion_val[0][xy + v->blocks_off][1] = s->mv[0][0][1];

  2149.         s->current_picture.motion_val[1][xy + v->blocks_off][0] = s->mv[1][0][0];

  2150.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = s->mv[1][0][1];

  2151.         return;

  2152.     }

  2153. 

  2154.     if ((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2155.         C   = s->current_picture.motion_val[0][xy - 2];

  2156.         A   = s->current_picture.motion_val[0][xy - wrap * 2];

  2157.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2158.         B   = s->current_picture.motion_val[0][xy - wrap * 2 + off];

  2159. 

  2160.         if (!s->mb_x) C[0] = C[1] = 0;

  2161.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2162.             if (s->mb_width == 1) {

  2163.                 px = A[0];

  2164.                 py = A[1];

  2165.             } else {

  2166.                 px = mid_pred(A[0], B[0], C[0]);

  2167.                 py = mid_pred(A[1], B[1], C[1]);

  2168.             }

  2169.         } else if (s->mb_x) { // predictor C is not out of bounds

  2170.             px = C[0];

  2171.             py = C[1];

  2172.         } else {

  2173.             px = py = 0;

  2174.         }

  2175.         /* Pullback MV as specified in 8.3.5.3.4 */

  2176.         {

  2177.             int qx, qy, X, Y;

  2178.             if (v->profile < PROFILE_ADVANCED) {

  2179.                 qx = (s->mb_x << 5);

  2180.                 qy = (s->mb_y << 5);

  2181.                 X  = (s->mb_width  << 5) - 4;

  2182.                 Y  = (s->mb_height << 5) - 4;

  2183.                 if (qx + px < -28) px = -28 - qx;

  2184.                 if (qy + py < -28) py = -28 - qy;

  2185.                 if (qx + px > X) px = X - qx;

  2186.                 if (qy + py > Y) py = Y - qy;

  2187.             } else {

  2188.                 qx = (s->mb_x << 6);

  2189.                 qy = (s->mb_y << 6);

  2190.                 X  = (s->mb_width  << 6) - 4;

  2191.                 Y  = (s->mb_height << 6) - 4;

  2192.                 if (qx + px < -60) px = -60 - qx;

  2193.                 if (qy + py < -60) py = -60 - qy;

  2194.                 if (qx + px > X) px = X - qx;

  2195.                 if (qy + py > Y) py = Y - qy;

  2196.             }

  2197.         }

  2198.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2199.         if (0 && !s->first_slice_line && s->mb_x) {

  2200.             if (is_intra[xy - wrap])

  2201.                 sum = FFABS(px) + FFABS(py);

  2202.             else

  2203.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2204.             if (sum > 32) {

  2205.                 if (get_bits1(&s->gb)) {

  2206.                     px = A[0];

  2207.                     py = A[1];

  2208.                 } else {

  2209.                     px = C[0];

  2210.                     py = C[1];

  2211.                 }

  2212.             } else {

  2213.                 if (is_intra[xy - 2])

  2214.                     sum = FFABS(px) + FFABS(py);

  2215.                 else

  2216.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2217.                 if (sum > 32) {

  2218.                     if (get_bits1(&s->gb)) {

  2219.                         px = A[0];

  2220.                         py = A[1];

  2221.                     } else {

  2222.                         px = C[0];

  2223.                         py = C[1];

  2224.                     }

  2225.                 }

  2226.             }

  2227.         }

  2228.         /* store MV using signed modulus of MV range defined in 4.11 */

  2229.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2230.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2231.     }

  2232.     if ((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2233.         C   = s->current_picture.motion_val[1][xy - 2];

  2234.         A   = s->current_picture.motion_val[1][xy - wrap * 2];

  2235.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2236.         B   = s->current_picture.motion_val[1][xy - wrap * 2 + off];

  2237. 

  2238.         if (!s->mb_x)

  2239.             C[0] = C[1] = 0;

  2240.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2241.             if (s->mb_width == 1) {

  2242.                 px = A[0];

  2243.                 py = A[1];

  2244.             } else {

  2245.                 px = mid_pred(A[0], B[0], C[0]);

  2246.                 py = mid_pred(A[1], B[1], C[1]);

  2247.             }

  2248.         } else if (s->mb_x) { // predictor C is not out of bounds

  2249.             px = C[0];

  2250.             py = C[1];

  2251.         } else {

  2252.             px = py = 0;

  2253.         }

  2254.         /* Pullback MV as specified in 8.3.5.3.4 */

  2255.         {

  2256.             int qx, qy, X, Y;

  2257.             if (v->profile < PROFILE_ADVANCED) {

  2258.                 qx = (s->mb_x << 5);

  2259.                 qy = (s->mb_y << 5);

  2260.                 X  = (s->mb_width  << 5) - 4;

  2261.                 Y  = (s->mb_height << 5) - 4;

  2262.                 if (qx + px < -28) px = -28 - qx;

  2263.                 if (qy + py < -28) py = -28 - qy;

  2264.                 if (qx + px > X) px = X - qx;

  2265.                 if (qy + py > Y) py = Y - qy;

  2266.             } else {

  2267.                 qx = (s->mb_x << 6);

  2268.                 qy = (s->mb_y << 6);

  2269.                 X  = (s->mb_width  << 6) - 4;

  2270.                 Y  = (s->mb_height << 6) - 4;

  2271.                 if (qx + px < -60) px = -60 - qx;

  2272.                 if (qy + py < -60) py = -60 - qy;

  2273.                 if (qx + px > X) px = X - qx;

  2274.                 if (qy + py > Y) py = Y - qy;

  2275.             }

  2276.         }

  2277.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2278.         if (0 && !s->first_slice_line && s->mb_x) {

  2279.             if (is_intra[xy - wrap])

  2280.                 sum = FFABS(px) + FFABS(py);

  2281.             else

  2282.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2283.             if (sum > 32) {

  2284.                 if (get_bits1(&s->gb)) {

  2285.                     px = A[0];

  2286.                     py = A[1];

  2287.                 } else {

  2288.                     px = C[0];

  2289.                     py = C[1];

  2290.                 }

  2291.             } else {

  2292.                 if (is_intra[xy - 2])

  2293.                     sum = FFABS(px) + FFABS(py);

  2294.                 else

  2295.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2296.                 if (sum > 32) {

  2297.                     if (get_bits1(&s->gb)) {

  2298.                         px = A[0];

  2299.                         py = A[1];

  2300.                     } else {

  2301.                         px = C[0];

  2302.                         py = C[1];

  2303.                     }

  2304.                 }

  2305.             }

  2306.         }

  2307.         /* store MV using signed modulus of MV range defined in 4.11 */

  2308. 

  2309.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2310.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2311.     }

  2312.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2313.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2314.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2315.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2316. }

  2317. 

  2318. static inline void vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y, int mv1, int *pred_flag)

  2319. {

  2320.     int dir = (v->bmvtype == BMV_TYPE_BACKWARD) ? 1 : 0;

  2321.     MpegEncContext *s = &v->s;

  2322.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2323. 

  2324.     if (v->bmvtype == BMV_TYPE_DIRECT) {

  2325.         int total_opp, k, f;

  2326.         if (s->next_picture.mb_type[mb_pos + v->mb_off] != MB_TYPE_INTRA) {

  2327.             s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2328.                                       v->bfraction, 0, s->quarter_sample);

  2329.             s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2330.                                       v->bfraction, 0, s->quarter_sample);

  2331.             s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2332.                                       v->bfraction, 1, s->quarter_sample);

  2333.             s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2334.                                       v->bfraction, 1, s->quarter_sample);

  2335. 

  2336.             total_opp = v->mv_f_next[0][s->block_index[0] + v->blocks_off]

  2337.                       + v->mv_f_next[0][s->block_index[1] + v->blocks_off]

  2338.                       + v->mv_f_next[0][s->block_index[2] + v->blocks_off]

  2339.                       + v->mv_f_next[0][s->block_index[3] + v->blocks_off];

  2340.             f = (total_opp > 2) ? 1 : 0;

  2341.         } else {

  2342.             s->mv[0][0][0] = s->mv[0][0][1] = 0;

  2343.             s->mv[1][0][0] = s->mv[1][0][1] = 0;

  2344.             f = 0;

  2345.         }

  2346.         v->ref_field_type[0] = v->ref_field_type[1] = v->cur_field_type ^ f;

  2347.         for (k = 0; k < 4; k++) {

  2348.             s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][0] = s->mv[0][0][0];

  2349.             s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][1] = s->mv[0][0][1];

  2350.             s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][0] = s->mv[1][0][0];

  2351.             s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][1] = s->mv[1][0][1];

  2352.             v->mv_f[0][s->block_index[k] + v->blocks_off] = f;

  2353.             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;

  2354.         }

  2355.         return;

  2356.     }

  2357.     if (v->bmvtype == BMV_TYPE_INTERPOLATED) {

  2358.         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);

  2359.         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);

  2360.         return;

  2361.     }

  2362.     if (dir) { // backward

  2363.         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);

  2364.         if (n == 3 || mv1) {

  2365.             vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0],   1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  2366.         }

  2367.     } else { // forward

  2368.         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);

  2369.         if (n == 3 || mv1) {

  2370.             vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1],   1, v->range_x, v->range_y, v->mb_type[0], 0, 1);

  2371.         }

  2372.     }

  2373. }

  2374. 

  2375. /** Get predicted DC value for I-frames only

  2376.  * prediction dir: left=0, top=1

  2377.  * @param s MpegEncContext

  2378.  * @param overlap flag indicating that overlap filtering is used

  2379.  * @param pq integer part of picture quantizer

  2380.  * @param[in] n block index in the current MB

  2381.  * @param dc_val_ptr Pointer to DC predictor

  2382.  * @param dir_ptr Prediction direction for use in AC prediction

  2383.  */

  2384. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2385.                                 int16_t **dc_val_ptr, int *dir_ptr)

  2386. {

  2387.     int a, b, c, wrap, pred, scale;

  2388.     int16_t *dc_val;

  2389.     static const uint16_t dcpred[32] = {

  2390.         -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2391.              114,  102,   93,   85,   79,   73,   68,   64,

  2392.               60,   57,   54,   51,   49,   47,   45,   43,

  2393.               41,   39,   38,   37,   35,   34,   33

  2394.     };

  2395. 

  2396.     /* find prediction - wmv3_dc_scale always used here in fact */

  2397.     if (n < 4) scale = s->y_dc_scale;

  2398.     else       scale = s->c_dc_scale;

  2399. 

  2400.     wrap   = s->block_wrap[n];

  2401.     dc_val = s->dc_val[0] + s->block_index[n];

  2402. 

  2403.     /* B A

  2404.      * C X

  2405.      */

  2406.     c = dc_val[ - 1];

  2407.     b = dc_val[ - 1 - wrap];

  2408.     a = dc_val[ - wrap];

  2409. 

  2410.     if (pq < 9 || !overlap) {

  2411.         /* Set outer values */

  2412.         if (s->first_slice_line && (n != 2 && n != 3))

  2413.             b = a = dcpred[scale];

  2414.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2415.             b = c = dcpred[scale];

  2416.     } else {

  2417.         /* Set outer values */

  2418.         if (s->first_slice_line && (n != 2 && n != 3))

  2419.             b = a = 0;

  2420.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2421.             b = c = 0;

  2422.     }

  2423. 

  2424.     if (abs(a - b) <= abs(b - c)) {

  2425.         pred     = c;

  2426.         *dir_ptr = 1; // left

  2427.     } else {

  2428.         pred     = a;

  2429.         *dir_ptr = 0; // top

  2430.     }

  2431. 

  2432.     /* update predictor */

  2433.     *dc_val_ptr = &dc_val[0];

  2434.     return pred;

  2435. }

  2436. 

  2437. 

  2438. /** Get predicted DC value

  2439.  * prediction dir: left=0, top=1

  2440.  * @param s MpegEncContext

  2441.  * @param overlap flag indicating that overlap filtering is used

  2442.  * @param pq integer part of picture quantizer

  2443.  * @param[in] n block index in the current MB

  2444.  * @param a_avail flag indicating top block availability

  2445.  * @param c_avail flag indicating left block availability

  2446.  * @param dc_val_ptr Pointer to DC predictor

  2447.  * @param dir_ptr Prediction direction for use in AC prediction

  2448.  */

  2449. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2450.                               int a_avail, int c_avail,

  2451.                               int16_t **dc_val_ptr, int *dir_ptr)

  2452. {

  2453.     int a, b, c, wrap, pred;

  2454.     int16_t *dc_val;

  2455.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2456.     int q1, q2 = 0;

  2457.     int dqscale_index;

  2458. 

  2459.     wrap = s->block_wrap[n];

  2460.     dc_val = s->dc_val[0] + s->block_index[n];

  2461. 

  2462.     /* B A

  2463.      * C X

  2464.      */

  2465.     c = dc_val[ - 1];

  2466.     b = dc_val[ - 1 - wrap];

  2467.     a = dc_val[ - wrap];

  2468.     /* scale predictors if needed */

  2469.     q1 = s->current_picture.qscale_table[mb_pos];

  2470.     dqscale_index = s->y_dc_scale_table[q1] - 1;

  2471.     if (dqscale_index < 0)

  2472.         return 0;

  2473.     if (c_avail && (n != 1 && n != 3)) {

  2474.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2475.         if (q2 && q2 != q1)

  2476.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2477.     }

  2478.     if (a_avail && (n != 2 && n != 3)) {

  2479.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2480.         if (q2 && q2 != q1)

  2481.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2482.     }

  2483.     if (a_avail && c_avail && (n != 3)) {

  2484.         int off = mb_pos;

  2485.         if (n != 1)

  2486.             off--;

  2487.         if (n != 2)

  2488.             off -= s->mb_stride;

  2489.         q2 = s->current_picture.qscale_table[off];

  2490.         if (q2 && q2 != q1)

  2491.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2492.     }

  2493. 

  2494.     if (a_avail && c_avail) {

  2495.         if (abs(a - b) <= abs(b - c)) {

  2496.             pred     = c;

  2497.             *dir_ptr = 1; // left

  2498.         } else {

  2499.             pred     = a;

  2500.             *dir_ptr = 0; // top

  2501.         }

  2502.     } else if (a_avail) {

  2503.         pred     = a;

  2504.         *dir_ptr = 0; // top

  2505.     } else if (c_avail) {

  2506.         pred     = c;

  2507.         *dir_ptr = 1; // left

  2508.     } else {

  2509.         pred     = 0;

  2510.         *dir_ptr = 1; // left

  2511.     }

  2512. 

  2513.     /* update predictor */

  2514.     *dc_val_ptr = &dc_val[0];

  2515.     return pred;

  2516. }

  2517. 

  2518. /** @} */ // Block group

  2519. 

  2520. /**

  2521.  * @name VC1 Macroblock-level functions in Simple/Main Profiles

  2522.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2523.  * @{

  2524.  */

  2525. 

  2526. static inline int vc1_coded_block_pred(MpegEncContext * s, int n,

  2527.                                        uint8_t **coded_block_ptr)

  2528. {

  2529.     int xy, wrap, pred, a, b, c;

  2530. 

  2531.     xy   = s->block_index[n];

  2532.     wrap = s->b8_stride;

  2533. 

  2534.     /* B C

  2535.      * A X

  2536.      */

  2537.     a = s->coded_block[xy - 1       ];

  2538.     b = s->coded_block[xy - 1 - wrap];

  2539.     c = s->coded_block[xy     - wrap];

  2540. 

  2541.     if (b == c) {

  2542.         pred = a;

  2543.     } else {

  2544.         pred = c;

  2545.     }

  2546. 

  2547.     /* store value */

  2548.     *coded_block_ptr = &s->coded_block[xy];

  2549. 

  2550.     return pred;

  2551. }

  2552. 

  2553. /**

  2554.  * Decode one AC coefficient

  2555.  * @param v The VC1 context

  2556.  * @param last Last coefficient

  2557.  * @param skip How much zero coefficients to skip

  2558.  * @param value Decoded AC coefficient value

  2559.  * @param codingset set of VLC to decode data

  2560.  * @see 8.1.3.4

  2561.  */

  2562. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,

  2563.                                 int *value, int codingset)

  2564. {

  2565.     GetBitContext *gb = &v->s.gb;

  2566.     int index, escape, run = 0, level = 0, lst = 0;

  2567. 

  2568.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2569.     if (index != ff_vc1_ac_sizes[codingset] - 1) {

  2570.         run   = vc1_index_decode_table[codingset][index][0];

  2571.         level = vc1_index_decode_table[codingset][index][1];

  2572.         lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;

  2573.         if (get_bits1(gb))

  2574.             level = -level;

  2575.     } else {

  2576.         escape = decode210(gb);

  2577.         if (escape != 2) {

  2578.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2579.             run   = vc1_index_decode_table[codingset][index][0];

  2580.             level = vc1_index_decode_table[codingset][index][1];

  2581.             lst   = index >= vc1_last_decode_table[codingset];

  2582.             if (escape == 0) {

  2583.                 if (lst)

  2584.                     level += vc1_last_delta_level_table[codingset][run];

  2585.                 else

  2586.                     level += vc1_delta_level_table[codingset][run];

  2587.             } else {

  2588.                 if (lst)

  2589.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2590.                 else

  2591.                     run += vc1_delta_run_table[codingset][level] + 1;

  2592.             }

  2593.             if (get_bits1(gb))

  2594.                 level = -level;

  2595.         } else {

  2596.             int sign;

  2597.             lst = get_bits1(gb);

  2598.             if (v->s.esc3_level_length == 0) {

  2599.                 if (v->pq < 8 || v->dquantfrm) { // table 59

  2600.                     v->s.esc3_level_length = get_bits(gb, 3);

  2601.                     if (!v->s.esc3_level_length)

  2602.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2603.                 } else { // table 60

  2604.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  2605.                 }

  2606.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2607.             }

  2608.             run   = get_bits(gb, v->s.esc3_run_length);

  2609.             sign  = get_bits1(gb);

  2610.             level = get_bits(gb, v->s.esc3_level_length);

  2611.             if (sign)

  2612.                 level = -level;

  2613.         }

  2614.     }

  2615. 

  2616.     *last  = lst;

  2617.     *skip  = run;

  2618.     *value = level;

  2619. }

  2620. 

  2621. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2622.  * @param v VC1Context

  2623.  * @param block block to decode

  2624.  * @param[in] n subblock index

  2625.  * @param coded are AC coeffs present or not

  2626.  * @param codingset set of VLC to decode data

  2627.  */

  2628. static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,

  2629.                               int coded, int codingset)

  2630. {

  2631.     GetBitContext *gb = &v->s.gb;

  2632.     MpegEncContext *s = &v->s;

  2633.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2634.     int i;

  2635.     int16_t *dc_val;

  2636.     int16_t *ac_val, *ac_val2;

  2637.     int dcdiff;

  2638. 

  2639.     /* Get DC differential */

  2640.     if (n < 4) {

  2641.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2642.     } else {

  2643.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2644.     }

  2645.     if (dcdiff < 0) {

  2646.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2647.         return -1;

  2648.     }

  2649.     if (dcdiff) {

  2650.         if (dcdiff == 119 /* ESC index value */) {

  2651.             /* TODO: Optimize */

  2652.             if (v->pq == 1)      dcdiff = get_bits(gb, 10);

  2653.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2654.             else                 dcdiff = get_bits(gb, 8);

  2655.         } else {

  2656.             if (v->pq == 1)

  2657.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2658.             else if (v->pq == 2)

  2659.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2660.         }

  2661.         if (get_bits1(gb))

  2662.             dcdiff = -dcdiff;

  2663.     }

  2664. 

  2665.     /* Prediction */

  2666.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2667.     *dc_val = dcdiff;

  2668. 

  2669.     /* Store the quantized DC coeff, used for prediction */

  2670.     if (n < 4) {

  2671.         block[0] = dcdiff * s->y_dc_scale;

  2672.     } else {

  2673.         block[0] = dcdiff * s->c_dc_scale;

  2674.     }

  2675.     /* Skip ? */

  2676.     if (!coded) {

  2677.         goto not_coded;

  2678.     }

  2679. 

  2680.     // AC Decoding

  2681.     i = 1;

  2682. 

  2683.     {

  2684.         int last = 0, skip, value;

  2685.         const uint8_t *zz_table;

  2686.         int scale;

  2687.         int k;

  2688. 

  2689.         scale = v->pq * 2 + v->halfpq;

  2690. 

  2691.         if (v->s.ac_pred) {

  2692.             if (!dc_pred_dir)

  2693.                 zz_table = v->zz_8x8[2];

  2694.             else

  2695.                 zz_table = v->zz_8x8[3];

  2696.         } else

  2697.             zz_table = v->zz_8x8[1];

  2698. 

  2699.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2700.         ac_val2 = ac_val;

  2701.         if (dc_pred_dir) // left

  2702.             ac_val -= 16;

  2703.         else // top

  2704.             ac_val -= 16 * s->block_wrap[n];

  2705. 

  2706.         while (!last) {

  2707.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2708.             i += skip;

  2709.             if (i > 63)

  2710.                 break;

  2711.             block[zz_table[i++]] = value;

  2712.         }

  2713. 

  2714.         /* apply AC prediction if needed */

  2715.         if (s->ac_pred) {

  2716.             if (dc_pred_dir) { // left

  2717.                 for (k = 1; k < 8; k++)

  2718.                     block[k << v->left_blk_sh] += ac_val[k];

  2719.             } else { // top

  2720.                 for (k = 1; k < 8; k++)

  2721.                     block[k << v->top_blk_sh] += ac_val[k + 8];

  2722.             }

  2723.         }

  2724.         /* save AC coeffs for further prediction */

  2725.         for (k = 1; k < 8; k++) {

  2726.             ac_val2[k]     = block[k << v->left_blk_sh];

  2727.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2728.         }

  2729. 

  2730.         /* scale AC coeffs */

  2731.         for (k = 1; k < 64; k++)

  2732.             if (block[k]) {

  2733.                 block[k] *= scale;

  2734.                 if (!v->pquantizer)

  2735.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2736.             }

  2737. 

  2738.         if (s->ac_pred) i = 63;

  2739.     }

  2740. 

  2741. not_coded:

  2742.     if (!coded) {

  2743.         int k, scale;

  2744.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2745.         ac_val2 = ac_val;

  2746. 

  2747.         i = 0;

  2748.         scale = v->pq * 2 + v->halfpq;

  2749.         memset(ac_val2, 0, 16 * 2);

  2750.         if (dc_pred_dir) { // left

  2751.             ac_val -= 16;

  2752.             if (s->ac_pred)

  2753.                 memcpy(ac_val2, ac_val, 8 * 2);

  2754.         } else { // top

  2755.             ac_val -= 16 * s->block_wrap[n];

  2756.             if (s->ac_pred)

  2757.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2758.         }

  2759. 

  2760.         /* apply AC prediction if needed */

  2761.         if (s->ac_pred) {

  2762.             if (dc_pred_dir) { //left

  2763.                 for (k = 1; k < 8; k++) {

  2764.                     block[k << v->left_blk_sh] = ac_val[k] * scale;

  2765.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2766.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -v->pq : v->pq;

  2767.                 }

  2768.             } else { // top

  2769.                 for (k = 1; k < 8; k++) {

  2770.                     block[k << v->top_blk_sh] = ac_val[k + 8] * scale;

  2771.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2772.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -v->pq : v->pq;

  2773.                 }

  2774.             }

  2775.             i = 63;

  2776.         }

  2777.     }

  2778.     s->block_last_index[n] = i;

  2779. 

  2780.     return 0;

  2781. }

  2782. 

  2783. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2784.  * @param v VC1Context

  2785.  * @param block block to decode

  2786.  * @param[in] n subblock number

  2787.  * @param coded are AC coeffs present or not

  2788.  * @param codingset set of VLC to decode data

  2789.  * @param mquant quantizer value for this macroblock

  2790.  */

  2791. static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,

  2792.                                   int coded, int codingset, int mquant)

  2793. {

  2794.     GetBitContext *gb = &v->s.gb;

  2795.     MpegEncContext *s = &v->s;

  2796.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2797.     int i;

  2798.     int16_t *dc_val;

  2799.     int16_t *ac_val, *ac_val2;

  2800.     int dcdiff;

  2801.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2802.     int use_pred = s->ac_pred;

  2803.     int scale;

  2804.     int q1, q2 = 0;

  2805.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2806. 

  2807.     /* Get DC differential */

  2808.     if (n < 4) {

  2809.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2810.     } else {

  2811.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2812.     }

  2813.     if (dcdiff < 0) {

  2814.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2815.         return -1;

  2816.     }

  2817.     if (dcdiff) {

  2818.         if (dcdiff == 119 /* ESC index value */) {

  2819.             /* TODO: Optimize */

  2820.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  2821.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2822.             else                  dcdiff = get_bits(gb, 8);

  2823.         } else {

  2824.             if (mquant == 1)

  2825.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2826.             else if (mquant == 2)

  2827.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2828.         }

  2829.         if (get_bits1(gb))

  2830.             dcdiff = -dcdiff;

  2831.     }

  2832. 

  2833.     /* Prediction */

  2834.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2835.     *dc_val = dcdiff;

  2836. 

  2837.     /* Store the quantized DC coeff, used for prediction */

  2838.     if (n < 4) {

  2839.         block[0] = dcdiff * s->y_dc_scale;

  2840.     } else {

  2841.         block[0] = dcdiff * s->c_dc_scale;

  2842.     }

  2843. 

  2844.     //AC Decoding

  2845.     i = 1;

  2846. 

  2847.     /* check if AC is needed at all */

  2848.     if (!a_avail && !c_avail)

  2849.         use_pred = 0;

  2850.     ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2851.     ac_val2 = ac_val;

  2852. 

  2853.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  2854. 

  2855.     if (dc_pred_dir) // left

  2856.         ac_val -= 16;

  2857.     else // top

  2858.         ac_val -= 16 * s->block_wrap[n];

  2859. 

  2860.     q1 = s->current_picture.qscale_table[mb_pos];

  2861.     if ( dc_pred_dir && c_avail && mb_pos)

  2862.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2863.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  2864.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2865.     if ( dc_pred_dir && n == 1)

  2866.         q2 = q1;

  2867.     if (!dc_pred_dir && n == 2)

  2868.         q2 = q1;

  2869.     if (n == 3)

  2870.         q2 = q1;

  2871. 

  2872.     if (coded) {

  2873.         int last = 0, skip, value;

  2874.         const uint8_t *zz_table;

  2875.         int k;

  2876. 

  2877.         if (v->s.ac_pred) {

  2878.             if (!use_pred && v->fcm == ILACE_FRAME) {

  2879.                 zz_table = v->zzi_8x8;

  2880.             } else {

  2881.                 if (!dc_pred_dir) // top

  2882.                     zz_table = v->zz_8x8[2];

  2883.                 else // left

  2884.                     zz_table = v->zz_8x8[3];

  2885.             }

  2886.         } else {

  2887.             if (v->fcm != ILACE_FRAME)

  2888.                 zz_table = v->zz_8x8[1];

  2889.             else

  2890.                 zz_table = v->zzi_8x8;

  2891.         }

  2892. 

  2893.         while (!last) {

  2894.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2895.             i += skip;

  2896.             if (i > 63)

  2897.                 break;

  2898.             block[zz_table[i++]] = value;

  2899.         }

  2900. 

  2901.         /* apply AC prediction if needed */

  2902.         if (use_pred) {

  2903.             /* scale predictors if needed*/

  2904.             if (q2 && q1 != q2) {

  2905.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2906.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2907. 

  2908.                 if (q1 < 1)

  2909.                     return AVERROR_INVALIDDATA;

  2910.                 if (dc_pred_dir) { // left

  2911.                     for (k = 1; k < 8; k++)

  2912.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2913.                 } else { // top

  2914.                     for (k = 1; k < 8; k++)

  2915.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2916.                 }

  2917.             } else {

  2918.                 if (dc_pred_dir) { //left

  2919.                     for (k = 1; k < 8; k++)

  2920.                         block[k << v->left_blk_sh] += ac_val[k];

  2921.                 } else { //top

  2922.                     for (k = 1; k < 8; k++)

  2923.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  2924.                 }

  2925.             }

  2926.         }

  2927.         /* save AC coeffs for further prediction */

  2928.         for (k = 1; k < 8; k++) {

  2929.             ac_val2[k    ] = block[k << v->left_blk_sh];

  2930.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2931.         }

  2932. 

  2933.         /* scale AC coeffs */

  2934.         for (k = 1; k < 64; k++)

  2935.             if (block[k]) {

  2936.                 block[k] *= scale;

  2937.                 if (!v->pquantizer)

  2938.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2939.             }

  2940. 

  2941.         if (use_pred) i = 63;

  2942.     } else { // no AC coeffs

  2943.         int k;

  2944. 

  2945.         memset(ac_val2, 0, 16 * 2);

  2946.         if (dc_pred_dir) { // left

  2947.             if (use_pred) {

  2948.                 memcpy(ac_val2, ac_val, 8 * 2);

  2949.                 if (q2 && q1 != q2) {

  2950.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2951.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2952.                     if (q1 < 1)

  2953.                         return AVERROR_INVALIDDATA;

  2954.                     for (k = 1; k < 8; k++)

  2955.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2956.                 }

  2957.             }

  2958.         } else { // top

  2959.             if (use_pred) {

  2960.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2961.                 if (q2 && q1 != q2) {

  2962.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2963.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2964.                     if (q1 < 1)

  2965.                         return AVERROR_INVALIDDATA;

  2966.                     for (k = 1; k < 8; k++)

  2967.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2968.                 }

  2969.             }

  2970.         }

  2971. 

  2972.         /* apply AC prediction if needed */

  2973.         if (use_pred) {

  2974.             if (dc_pred_dir) { // left

  2975.                 for (k = 1; k < 8; k++) {

  2976.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  2977.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2978.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  2979.                 }

  2980.             } else { // top

  2981.                 for (k = 1; k < 8; k++) {

  2982.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  2983.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2984.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  2985.                 }

  2986.             }

  2987.             i = 63;

  2988.         }

  2989.     }

  2990.     s->block_last_index[n] = i;

  2991. 

  2992.     return 0;

  2993. }

  2994. 

  2995. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2996.  * @param v VC1Context

  2997.  * @param block block to decode

  2998.  * @param[in] n subblock index

  2999.  * @param coded are AC coeffs present or not

  3000.  * @param mquant block quantizer

  3001.  * @param codingset set of VLC to decode data

  3002.  */

  3003. static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,

  3004.                                   int coded, int mquant, int codingset)

  3005. {

  3006.     GetBitContext *gb = &v->s.gb;

  3007.     MpegEncContext *s = &v->s;

  3008.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  3009.     int i;

  3010.     int16_t *dc_val;

  3011.     int16_t *ac_val, *ac_val2;

  3012.     int dcdiff;

  3013.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3014.     int a_avail = v->a_avail, c_avail = v->c_avail;

  3015.     int use_pred = s->ac_pred;

  3016.     int scale;

  3017.     int q1, q2 = 0;

  3018. 

  3019.     s->dsp.clear_block(block);

  3020. 

  3021.     /* XXX: Guard against dumb values of mquant */

  3022.     mquant = (mquant < 1) ? 0 : ((mquant > 31) ? 31 : mquant);

  3023. 

  3024.     /* Set DC scale - y and c use the same */

  3025.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  3026.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  3027. 

  3028.     /* Get DC differential */

  3029.     if (n < 4) {

  3030.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3031.     } else {

  3032.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  3033.     }

  3034.     if (dcdiff < 0) {

  3035.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  3036.         return -1;

  3037.     }

  3038.     if (dcdiff) {

  3039.         if (dcdiff == 119 /* ESC index value */) {

  3040.             /* TODO: Optimize */

  3041.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  3042.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  3043.             else                  dcdiff = get_bits(gb, 8);

  3044.         } else {

  3045.             if (mquant == 1)

  3046.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  3047.             else if (mquant == 2)

  3048.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  3049.         }

  3050.         if (get_bits1(gb))

  3051.             dcdiff = -dcdiff;

  3052.     }

  3053. 

  3054.     /* Prediction */

  3055.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  3056.     *dc_val = dcdiff;

  3057. 

  3058.     /* Store the quantized DC coeff, used for prediction */

  3059. 

  3060.     if (n < 4) {

  3061.         block[0] = dcdiff * s->y_dc_scale;

  3062.     } else {

  3063.         block[0] = dcdiff * s->c_dc_scale;

  3064.     }

  3065. 

  3066.     //AC Decoding

  3067.     i = 1;

  3068. 

  3069.     /* check if AC is needed at all and adjust direction if needed */

  3070.     if (!a_avail) dc_pred_dir = 1;

  3071.     if (!c_avail) dc_pred_dir = 0;

  3072.     if (!a_avail && !c_avail) use_pred = 0;

  3073.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  3074.     ac_val2 = ac_val;

  3075. 

  3076.     scale = mquant * 2 + v->halfpq;

  3077. 

  3078.     if (dc_pred_dir) //left

  3079.         ac_val -= 16;

  3080.     else //top

  3081.         ac_val -= 16 * s->block_wrap[n];

  3082. 

  3083.     q1 = s->current_picture.qscale_table[mb_pos];

  3084.     if (dc_pred_dir && c_avail && mb_pos)

  3085.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  3086.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  3087.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  3088.     if ( dc_pred_dir && n == 1)

  3089.         q2 = q1;

  3090.     if (!dc_pred_dir && n == 2)

  3091.         q2 = q1;

  3092.     if (n == 3) q2 = q1;

  3093. 

  3094.     if (coded) {

  3095.         int last = 0, skip, value;

  3096.         int k;

  3097. 

  3098.         while (!last) {

  3099.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  3100.             i += skip;

  3101.             if (i > 63)

  3102.                 break;

  3103.             if (v->fcm == PROGRESSIVE)

  3104.                 block[v->zz_8x8[0][i++]] = value;

  3105.             else {

  3106.                 if (use_pred && (v->fcm == ILACE_FRAME)) {

  3107.                     if (!dc_pred_dir) // top

  3108.                         block[v->zz_8x8[2][i++]] = value;

  3109.                     else // left

  3110.                         block[v->zz_8x8[3][i++]] = value;

  3111.                 } else {

  3112.                     block[v->zzi_8x8[i++]] = value;

  3113.                 }

  3114.             }

  3115.         }

  3116. 

  3117.         /* apply AC prediction if needed */

  3118.         if (use_pred) {

  3119.             /* scale predictors if needed*/

  3120.             if (q2 && q1 != q2) {

  3121.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3122.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3123. 

  3124.                 if (q1 < 1)

  3125.                     return AVERROR_INVALIDDATA;

  3126.                 if (dc_pred_dir) { // left

  3127.                     for (k = 1; k < 8; k++)

  3128.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3129.                 } else { //top

  3130.                     for (k = 1; k < 8; k++)

  3131.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3132.                 }

  3133.             } else {

  3134.                 if (dc_pred_dir) { // left

  3135.                     for (k = 1; k < 8; k++)

  3136.                         block[k << v->left_blk_sh] += ac_val[k];

  3137.                 } else { // top

  3138.                     for (k = 1; k < 8; k++)

  3139.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  3140.                 }

  3141.             }

  3142.         }

  3143.         /* save AC coeffs for further prediction */

  3144.         for (k = 1; k < 8; k++) {

  3145.             ac_val2[k    ] = block[k << v->left_blk_sh];

  3146.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  3147.         }

  3148. 

  3149.         /* scale AC coeffs */

  3150.         for (k = 1; k < 64; k++)

  3151.             if (block[k]) {

  3152.                 block[k] *= scale;

  3153.                 if (!v->pquantizer)

  3154.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3155.             }

  3156. 

  3157.         if (use_pred) i = 63;

  3158.     } else { // no AC coeffs

  3159.         int k;

  3160. 

  3161.         memset(ac_val2, 0, 16 * 2);

  3162.         if (dc_pred_dir) { // left

  3163.             if (use_pred) {

  3164.                 memcpy(ac_val2, ac_val, 8 * 2);

  3165.                 if (q2 && q1 != q2) {

  3166.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3167.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3168.                     if (q1 < 1)

  3169.                         return AVERROR_INVALIDDATA;

  3170.                     for (k = 1; k < 8; k++)

  3171.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3172.                 }

  3173.             }

  3174.         } else { // top

  3175.             if (use_pred) {

  3176.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3177.                 if (q2 && q1 != q2) {

  3178.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3179.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3180.                     if (q1 < 1)

  3181.                         return AVERROR_INVALIDDATA;

  3182.                     for (k = 1; k < 8; k++)

  3183.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3184.                 }

  3185.             }

  3186.         }

  3187. 

  3188.         /* apply AC prediction if needed */

  3189.         if (use_pred) {

  3190.             if (dc_pred_dir) { // left

  3191.                 for (k = 1; k < 8; k++) {

  3192.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  3193.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  3194.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  3195.                 }

  3196.             } else { // top

  3197.                 for (k = 1; k < 8; k++) {

  3198.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  3199.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  3200.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  3201.                 }

  3202.             }

  3203.             i = 63;

  3204.         }

  3205.     }

  3206.     s->block_last_index[n] = i;

  3207. 

  3208.     return 0;

  3209. }

  3210. 

  3211. /** Decode P block

  3212.  */

  3213. static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,

  3214.                               int mquant, int ttmb, int first_block,

  3215.                               uint8_t *dst, int linesize, int skip_block,

  3216.                               int *ttmb_out)

  3217. {

  3218.     MpegEncContext *s = &v->s;

  3219.     GetBitContext *gb = &s->gb;

  3220.     int i, j;

  3221.     int subblkpat = 0;

  3222.     int scale, off, idx, last, skip, value;

  3223.     int ttblk = ttmb & 7;

  3224.     int pat = 0;

  3225. 

  3226.     s->dsp.clear_block(block);

  3227. 

  3228.     if (ttmb == -1) {

  3229.         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)];

  3230.     }

  3231.     if (ttblk == TT_4X4) {

  3232.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  3233.     }

  3234.     if ((ttblk != TT_8X8 && ttblk != TT_4X4)

  3235.         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))

  3236.             || (!v->res_rtm_flag && !first_block))) {

  3237.         subblkpat = decode012(gb);

  3238.         if (subblkpat)

  3239.             subblkpat ^= 3; // swap decoded pattern bits

  3240.         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)

  3241.             ttblk = TT_8X4;

  3242.         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)

  3243.             ttblk = TT_4X8;

  3244.     }

  3245.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  3246. 

  3247.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  3248.     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  3249.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  3250.         ttblk     = TT_8X4;

  3251.     }

  3252.     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  3253.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  3254.         ttblk     = TT_4X8;

  3255.     }

  3256.     switch (ttblk) {

  3257.     case TT_8X8:

  3258.         pat  = 0xF;

  3259.         i    = 0;

  3260.         last = 0;

  3261.         while (!last) {

  3262.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3263.             i += skip;

  3264.             if (i > 63)

  3265.                 break;

  3266.             if (!v->fcm)

  3267.                 idx = v->zz_8x8[0][i++];

  3268.             else

  3269.                 idx = v->zzi_8x8[i++];

  3270.             block[idx] = value * scale;

  3271.             if (!v->pquantizer)

  3272.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3273.         }

  3274.         if (!skip_block) {

  3275.             if (i == 1)

  3276.                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);

  3277.             else {

  3278.                 v->vc1dsp.vc1_inv_trans_8x8(block);

  3279.                 s->dsp.add_pixels_clamped(block, dst, linesize);

  3280.             }

  3281.         }

  3282.         break;

  3283.     case TT_4X4:

  3284.         pat = ~subblkpat & 0xF;

  3285.         for (j = 0; j < 4; j++) {

  3286.             last = subblkpat & (1 << (3 - j));

  3287.             i    = 0;

  3288.             off  = (j & 1) * 4 + (j & 2) * 16;

  3289.             while (!last) {

  3290.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3291.                 i += skip;

  3292.                 if (i > 15)

  3293.                     break;

  3294.                 if (!v->fcm)

  3295.                     idx = ff_vc1_simple_progressive_4x4_zz[i++];

  3296.                 else

  3297.                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];

  3298.                 block[idx + off] = value * scale;

  3299.                 if (!v->pquantizer)

  3300.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3301.             }

  3302.             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {

  3303.                 if (i == 1)

  3304.                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);

  3305.                 else

  3306.                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);

  3307.             }

  3308.         }

  3309.         break;

  3310.     case TT_8X4:

  3311.         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;

  3312.         for (j = 0; j < 2; j++) {

  3313.             last = subblkpat & (1 << (1 - j));

  3314.             i    = 0;

  3315.             off  = j * 32;

  3316.             while (!last) {

  3317.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3318.                 i += skip;

  3319.                 if (i > 31)

  3320.                     break;

  3321.                 if (!v->fcm)

  3322.                     idx = v->zz_8x4[i++] + off;

  3323.                 else

  3324.                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;

  3325.                 block[idx] = value * scale;

  3326.                 if (!v->pquantizer)

  3327.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3328.             }

  3329.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3330.                 if (i == 1)

  3331.                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);

  3332.                 else

  3333.                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);

  3334.             }

  3335.         }

  3336.         break;

  3337.     case TT_4X8:

  3338.         pat = ~(subblkpat * 5) & 0xF;

  3339.         for (j = 0; j < 2; j++) {

  3340.             last = subblkpat & (1 << (1 - j));

  3341.             i    = 0;

  3342.             off  = j * 4;

  3343.             while (!last) {

  3344.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3345.                 i += skip;

  3346.                 if (i > 31)

  3347.                     break;

  3348.                 if (!v->fcm)

  3349.                     idx = v->zz_4x8[i++] + off;

  3350.                 else

  3351.                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;

  3352.                 block[idx] = value * scale;

  3353.                 if (!v->pquantizer)

  3354.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3355.             }

  3356.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3357.                 if (i == 1)

  3358.                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);

  3359.                 else

  3360.                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  3361.             }

  3362.         }

  3363.         break;

  3364.     }

  3365.     if (ttmb_out)

  3366.         *ttmb_out |= ttblk << (n * 4);

  3367.     return pat;

  3368. }

  3369. 

  3370. /** @} */ // Macroblock group

  3371. 

  3372. static const int size_table  [6] = { 0, 2, 3, 4,  5,  8 };

  3373. static const int offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3374. 

  3375. static av_always_inline void vc1_apply_p_v_loop_filter(VC1Context *v, int block_num)

  3376. {

  3377.     MpegEncContext *s  = &v->s;

  3378.     int mb_cbp         = v->cbp[s->mb_x - s->mb_stride],

  3379.         block_cbp      = mb_cbp      >> (block_num * 4), bottom_cbp,

  3380.         mb_is_intra    = v->is_intra[s->mb_x - s->mb_stride],

  3381.         block_is_intra = mb_is_intra >> (block_num * 4), bottom_is_intra;

  3382.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3383.     uint8_t *dst;

  3384. 

  3385.     if (block_num > 3) {

  3386.         dst      = s->dest[block_num - 3];

  3387.     } else {

  3388.         dst      = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 8) * linesize;

  3389.     }

  3390.     if (s->mb_y != s->end_mb_y || block_num < 2) {

  3391.         int16_t (*mv)[2];

  3392.         int mv_stride;

  3393. 

  3394.         if (block_num > 3) {

  3395.             bottom_cbp      = v->cbp[s->mb_x]      >> (block_num * 4);

  3396.             bottom_is_intra = v->is_intra[s->mb_x] >> (block_num * 4);

  3397.             mv              = &v->luma_mv[s->mb_x - s->mb_stride];

  3398.             mv_stride       = s->mb_stride;

  3399.         } else {

  3400.             bottom_cbp      = (block_num < 2) ? (mb_cbp               >> ((block_num + 2) * 4))

  3401.                                               : (v->cbp[s->mb_x]      >> ((block_num - 2) * 4));

  3402.             bottom_is_intra = (block_num < 2) ? (mb_is_intra          >> ((block_num + 2) * 4))

  3403.                                               : (v->is_intra[s->mb_x] >> ((block_num - 2) * 4));

  3404.             mv_stride       = s->b8_stride;

  3405.             mv              = &s->current_picture.motion_val[0][s->block_index[block_num] - 2 * mv_stride];

  3406.         }

  3407. 

  3408.         if (bottom_is_intra & 1 || block_is_intra & 1 ||

  3409.             mv[0][0] != mv[mv_stride][0] || mv[0][1] != mv[mv_stride][1]) {

  3410.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3411.         } else {

  3412.             idx = ((bottom_cbp >> 2) | block_cbp) & 3;

  3413.             if (idx == 3) {

  3414.                 v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3415.             } else if (idx) {

  3416.                 if (idx == 1)

  3417.                     v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3418.                 else

  3419.                     v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3420.             }

  3421.         }

  3422.     }

  3423. 

  3424.     dst -= 4 * linesize;

  3425.     ttblk = (v->ttblk[s->mb_x - s->mb_stride] >> (block_num * 4)) & 0xF;

  3426.     if (ttblk == TT_4X4 || ttblk == TT_8X4) {

  3427.         idx = (block_cbp | (block_cbp >> 2)) & 3;

  3428.         if (idx == 3) {

  3429.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3430.         } else if (idx) {

  3431.             if (idx == 1)

  3432.                 v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3433.             else

  3434.                 v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3435.         }

  3436.     }

  3437. }

  3438. 

  3439. static av_always_inline void vc1_apply_p_h_loop_filter(VC1Context *v, int block_num)

  3440. {

  3441.     MpegEncContext *s  = &v->s;

  3442.     int mb_cbp         = v->cbp[s->mb_x - 1 - s->mb_stride],

  3443.         block_cbp      = mb_cbp      >> (block_num * 4), right_cbp,

  3444.         mb_is_intra    = v->is_intra[s->mb_x - 1 - s->mb_stride],

  3445.         block_is_intra = mb_is_intra >> (block_num * 4), right_is_intra;

  3446.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3447.     uint8_t *dst;

  3448. 

  3449.     if (block_num > 3) {

  3450.         dst = s->dest[block_num - 3] - 8 * linesize;

  3451.     } else {

  3452.         dst = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 16) * linesize - 8;

  3453.     }

  3454. 

  3455.     if (s->mb_x != s->mb_width || !(block_num & 5)) {

  3456.         int16_t (*mv)[2];

  3457. 

  3458.         if (block_num > 3) {

  3459.             right_cbp      = v->cbp[s->mb_x - s->mb_stride] >> (block_num * 4);

  3460.             right_is_intra = v->is_intra[s->mb_x - s->mb_stride] >> (block_num * 4);

  3461.             mv             = &v->luma_mv[s->mb_x - s->mb_stride - 1];

  3462.         } else {

  3463.             right_cbp      = (block_num & 1) ? (v->cbp[s->mb_x - s->mb_stride]      >> ((block_num - 1) * 4))

  3464.                                              : (mb_cbp                              >> ((block_num + 1) * 4));

  3465.             right_is_intra = (block_num & 1) ? (v->is_intra[s->mb_x - s->mb_stride] >> ((block_num - 1) * 4))

  3466.                                              : (mb_is_intra                         >> ((block_num + 1) * 4));

  3467.             mv             = &s->current_picture.motion_val[0][s->block_index[block_num] - s->b8_stride * 2 - 2];

  3468.         }

  3469.         if (block_is_intra & 1 || right_is_intra & 1 || mv[0][0] != mv[1][0] || mv[0][1] != mv[1][1]) {

  3470.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3471.         } else {

  3472.             idx = ((right_cbp >> 1) | block_cbp) & 5; // FIXME check

  3473.             if (idx == 5) {

  3474.                 v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3475.             } else if (idx) {

  3476.                 if (idx == 1)

  3477.                     v->vc1dsp.vc1_h_loop_filter4(dst + 4 * linesize, linesize, v->pq);

  3478.                 else

  3479.                     v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3480.             }

  3481.         }

  3482.     }

  3483. 

  3484.     dst -= 4;

  3485.     ttblk = (v->ttblk[s->mb_x - s->mb_stride - 1] >> (block_num * 4)) & 0xf;

  3486.     if (ttblk == TT_4X4 || ttblk == TT_4X8) {

  3487.         idx = (block_cbp | (block_cbp >> 1)) & 5;

  3488.         if (idx == 5) {

  3489.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3490.         } else if (idx) {

  3491.             if (idx == 1)

  3492.                 v->vc1dsp.vc1_h_loop_filter4(dst + linesize * 4, linesize, v->pq);

  3493.             else

  3494.                 v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3495.         }

  3496.     }

  3497. }

  3498. 

  3499. static void vc1_apply_p_loop_filter(VC1Context *v)

  3500. {

  3501.     MpegEncContext *s = &v->s;

  3502.     int i;

  3503. 

  3504.     for (i = 0; i < 6; i++) {

  3505.         vc1_apply_p_v_loop_filter(v, i);

  3506.     }

  3507. 

  3508.     /* V always precedes H, therefore we run H one MB before V;

  3509.      * at the end of a row, we catch up to complete the row */

  3510.     if (s->mb_x) {

  3511.         for (i = 0; i < 6; i++) {

  3512.             vc1_apply_p_h_loop_filter(v, i);

  3513.         }

  3514.         if (s->mb_x == s->mb_width - 1) {

  3515.             s->mb_x++;

  3516.             ff_update_block_index(s);

  3517.             for (i = 0; i < 6; i++) {

  3518.                 vc1_apply_p_h_loop_filter(v, i);

  3519.             }

  3520.         }

  3521.     }

  3522. }

  3523. 

  3524. /** Decode one P-frame MB

  3525.  */

  3526. static int vc1_decode_p_mb(VC1Context *v)

  3527. {

  3528.     MpegEncContext *s = &v->s;

  3529.     GetBitContext *gb = &s->gb;

  3530.     int i, j;

  3531.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3532.     int cbp; /* cbp decoding stuff */

  3533.     int mqdiff, mquant; /* MB quantization */

  3534.     int ttmb = v->ttfrm; /* MB Transform type */

  3535. 

  3536.     int mb_has_coeffs = 1; /* last_flag */

  3537.     int dmv_x, dmv_y; /* Differential MV components */

  3538.     int index, index1; /* LUT indexes */

  3539.     int val, sign; /* temp values */

  3540.     int first_block = 1;

  3541.     int dst_idx, off;

  3542.     int skipped, fourmv;

  3543.     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;

  3544. 

  3545.     mquant = v->pq; /* lossy initialization */

  3546. 

  3547.     if (v->mv_type_is_raw)

  3548.         fourmv = get_bits1(gb);

  3549.     else

  3550.         fourmv = v->mv_type_mb_plane[mb_pos];

  3551.     if (v->skip_is_raw)

  3552.         skipped = get_bits1(gb);

  3553.     else

  3554.         skipped = v->s.mbskip_table[mb_pos];

  3555. 

  3556.     if (!fourmv) { /* 1MV mode */

  3557.         if (!skipped) {

  3558.             GET_MVDATA(dmv_x, dmv_y);

  3559. 

  3560.             if (s->mb_intra) {

  3561.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3562.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3563.             }

  3564.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3565.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3566. 

  3567.             /* FIXME Set DC val for inter block ? */

  3568.             if (s->mb_intra && !mb_has_coeffs) {

  3569.                 GET_MQUANT();

  3570.                 s->ac_pred = get_bits1(gb);

  3571.                 cbp        = 0;

  3572.             } else if (mb_has_coeffs) {

  3573.                 if (s->mb_intra)

  3574.                     s->ac_pred = get_bits1(gb);

  3575.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3576.                 GET_MQUANT();

  3577.             } else {

  3578.                 mquant = v->pq;

  3579.                 cbp    = 0;

  3580.             }

  3581.             s->current_picture.qscale_table[mb_pos] = mquant;

  3582. 

  3583.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3584.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3585.                                 VC1_TTMB_VLC_BITS, 2);

  3586.             if (!s->mb_intra) vc1_mc_1mv(v, 0);

  3587.             dst_idx = 0;

  3588.             for (i = 0; i < 6; i++) {

  3589.                 s->dc_val[0][s->block_index[i]] = 0;

  3590.                 dst_idx += i >> 2;

  3591.                 val = ((cbp >> (5 - i)) & 1);

  3592.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3593.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3594.                 if (s->mb_intra) {

  3595.                     /* check if prediction blocks A and C are available */

  3596.                     v->a_avail = v->c_avail = 0;

  3597.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3598.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3599.                     if (i == 1 || i == 3 || s->mb_x)

  3600.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3601. 

  3602.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3603.                                            (i & 4) ? v->codingset2 : v->codingset);

  3604.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3605.                         continue;

  3606.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3607.                     if (v->rangeredfrm)

  3608.                         for (j = 0; j < 64; j++)

  3609.                             s->block[i][j] <<= 1;

  3610.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3611.                     if (v->pq >= 9 && v->overlap) {

  3612.                         if (v->c_avail)

  3613.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3614.                         if (v->a_avail)

  3615.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3616.                     }

  3617.                     block_cbp   |= 0xF << (i << 2);

  3618.                     block_intra |= 1 << i;

  3619.                 } else if (val) {

  3620.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block,

  3621.                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,

  3622.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3623.                     block_cbp |= pat << (i << 2);

  3624.                     if (!v->ttmbf && ttmb < 8)

  3625.                         ttmb = -1;

  3626.                     first_block = 0;

  3627.                 }

  3628.             }

  3629.         } else { // skipped

  3630.             s->mb_intra = 0;

  3631.             for (i = 0; i < 6; i++) {

  3632.                 v->mb_type[0][s->block_index[i]] = 0;

  3633.                 s->dc_val[0][s->block_index[i]]  = 0;

  3634.             }

  3635.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3636.             s->current_picture.qscale_table[mb_pos] = 0;

  3637.             vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3638.             vc1_mc_1mv(v, 0);

  3639.         }

  3640.     } else { // 4MV mode

  3641.         if (!skipped /* unskipped MB */) {

  3642.             int intra_count = 0, coded_inter = 0;

  3643.             int is_intra[6], is_coded[6];

  3644.             /* Get CBPCY */

  3645.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3646.             for (i = 0; i < 6; i++) {

  3647.                 val = ((cbp >> (5 - i)) & 1);

  3648.                 s->dc_val[0][s->block_index[i]] = 0;

  3649.                 s->mb_intra                     = 0;

  3650.                 if (i < 4) {

  3651.                     dmv_x = dmv_y = 0;

  3652.                     s->mb_intra   = 0;

  3653.                     mb_has_coeffs = 0;

  3654.                     if (val) {

  3655.                         GET_MVDATA(dmv_x, dmv_y);

  3656.                     }

  3657.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3658.                     if (!s->mb_intra)

  3659.                         vc1_mc_4mv_luma(v, i, 0, 0);

  3660.                     intra_count += s->mb_intra;

  3661.                     is_intra[i]  = s->mb_intra;

  3662.                     is_coded[i]  = mb_has_coeffs;

  3663.                 }

  3664.                 if (i & 4) {

  3665.                     is_intra[i] = (intra_count >= 3);

  3666.                     is_coded[i] = val;

  3667.                 }

  3668.                 if (i == 4)

  3669.                     vc1_mc_4mv_chroma(v, 0);

  3670.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3671.                 if (!coded_inter)

  3672.                     coded_inter = !is_intra[i] & is_coded[i];

  3673.             }

  3674.             // if there are no coded blocks then don't do anything more

  3675.             dst_idx = 0;

  3676.             if (!intra_count && !coded_inter)

  3677.                 goto end;

  3678.             GET_MQUANT();

  3679.             s->current_picture.qscale_table[mb_pos] = mquant;

  3680.             /* test if block is intra and has pred */

  3681.             {

  3682.                 int intrapred = 0;

  3683.                 for (i = 0; i < 6; i++)

  3684.                     if (is_intra[i]) {

  3685.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3686.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3687.                             intrapred = 1;

  3688.                             break;

  3689.                         }

  3690.                     }

  3691.                 if (intrapred)

  3692.                     s->ac_pred = get_bits1(gb);

  3693.                 else

  3694.                     s->ac_pred = 0;

  3695.             }

  3696.             if (!v->ttmbf && coded_inter)

  3697.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3698.             for (i = 0; i < 6; i++) {

  3699.                 dst_idx    += i >> 2;

  3700.                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3701.                 s->mb_intra = is_intra[i];

  3702.                 if (is_intra[i]) {

  3703.                     /* check if prediction blocks A and C are available */

  3704.                     v->a_avail = v->c_avail = 0;

  3705.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3706.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3707.                     if (i == 1 || i == 3 || s->mb_x)

  3708.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3709. 

  3710.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant,

  3711.                                            (i & 4) ? v->codingset2 : v->codingset);

  3712.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3713.                         continue;

  3714.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3715.                     if (v->rangeredfrm)

  3716.                         for (j = 0; j < 64; j++)

  3717.                             s->block[i][j] <<= 1;

  3718.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off,

  3719.                                                      (i & 4) ? s->uvlinesize : s->linesize);

  3720.                     if (v->pq >= 9 && v->overlap) {

  3721.                         if (v->c_avail)

  3722.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3723.                         if (v->a_avail)

  3724.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3725.                     }

  3726.                     block_cbp   |= 0xF << (i << 2);

  3727.                     block_intra |= 1 << i;

  3728.                 } else if (is_coded[i]) {

  3729.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3730.                                              first_block, s->dest[dst_idx] + off,

  3731.                                              (i & 4) ? s->uvlinesize : s->linesize,

  3732.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  3733.                                              &block_tt);

  3734.                     block_cbp |= pat << (i << 2);

  3735.                     if (!v->ttmbf && ttmb < 8)

  3736.                         ttmb = -1;

  3737.                     first_block = 0;

  3738.                 }

  3739.             }

  3740.         } else { // skipped MB

  3741.             s->mb_intra                               = 0;

  3742.             s->current_picture.qscale_table[mb_pos] = 0;

  3743.             for (i = 0; i < 6; i++) {

  3744.                 v->mb_type[0][s->block_index[i]] = 0;

  3745.                 s->dc_val[0][s->block_index[i]]  = 0;

  3746.             }

  3747.             for (i = 0; i < 4; i++) {

  3748.                 vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3749.                 vc1_mc_4mv_luma(v, i, 0, 0);

  3750.             }

  3751.             vc1_mc_4mv_chroma(v, 0);

  3752.             s->current_picture.qscale_table[mb_pos] = 0;

  3753.         }

  3754.     }

  3755. end:

  3756.     v->cbp[s->mb_x]      = block_cbp;

  3757.     v->ttblk[s->mb_x]    = block_tt;

  3758.     v->is_intra[s->mb_x] = block_intra;

  3759. 

  3760.     return 0;

  3761. }

  3762. 

  3763. /* Decode one macroblock in an interlaced frame p picture */

  3764. 

  3765. static int vc1_decode_p_mb_intfr(VC1Context *v)

  3766. {

  3767.     MpegEncContext *s = &v->s;

  3768.     GetBitContext *gb = &s->gb;

  3769.     int i;

  3770.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3771.     int cbp = 0; /* cbp decoding stuff */

  3772.     int mqdiff, mquant; /* MB quantization */

  3773.     int ttmb = v->ttfrm; /* MB Transform type */

  3774. 

  3775.     int mb_has_coeffs = 1; /* last_flag */

  3776.     int dmv_x, dmv_y; /* Differential MV components */

  3777.     int val; /* temp value */

  3778.     int first_block = 1;

  3779.     int dst_idx, off;

  3780.     int skipped, fourmv = 0, twomv = 0;

  3781.     int block_cbp = 0, pat, block_tt = 0;

  3782.     int idx_mbmode = 0, mvbp;

  3783.     int stride_y, fieldtx;

  3784. 

  3785.     mquant = v->pq; /* Loosy initialization */

  3786. 

  3787.     if (v->skip_is_raw)

  3788.         skipped = get_bits1(gb);

  3789.     else

  3790.         skipped = v->s.mbskip_table[mb_pos];

  3791.     if (!skipped) {

  3792.         if (v->fourmvswitch)

  3793.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done

  3794.         else

  3795.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line

  3796.         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {

  3797.         /* store the motion vector type in a flag (useful later) */

  3798.         case MV_PMODE_INTFR_4MV:

  3799.             fourmv = 1;

  3800.             v->blk_mv_type[s->block_index[0]] = 0;

  3801.             v->blk_mv_type[s->block_index[1]] = 0;

  3802.             v->blk_mv_type[s->block_index[2]] = 0;

  3803.             v->blk_mv_type[s->block_index[3]] = 0;

  3804.             break;

  3805.         case MV_PMODE_INTFR_4MV_FIELD:

  3806.             fourmv = 1;

  3807.             v->blk_mv_type[s->block_index[0]] = 1;

  3808.             v->blk_mv_type[s->block_index[1]] = 1;

  3809.             v->blk_mv_type[s->block_index[2]] = 1;

  3810.             v->blk_mv_type[s->block_index[3]] = 1;

  3811.             break;

  3812.         case MV_PMODE_INTFR_2MV_FIELD:

  3813.             twomv = 1;

  3814.             v->blk_mv_type[s->block_index[0]] = 1;

  3815.             v->blk_mv_type[s->block_index[1]] = 1;

  3816.             v->blk_mv_type[s->block_index[2]] = 1;

  3817.             v->blk_mv_type[s->block_index[3]] = 1;

  3818.             break;

  3819.         case MV_PMODE_INTFR_1MV:

  3820.             v->blk_mv_type[s->block_index[0]] = 0;

  3821.             v->blk_mv_type[s->block_index[1]] = 0;

  3822.             v->blk_mv_type[s->block_index[2]] = 0;

  3823.             v->blk_mv_type[s->block_index[3]] = 0;

  3824.             break;

  3825.         }

  3826.         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  3827.             for (i = 0; i < 4; i++) {

  3828.                 s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  3829.                 s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  3830.             }

  3831.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  3832.             s->mb_intra = v->is_intra[s->mb_x] = 1;

  3833.             for (i = 0; i < 6; i++)

  3834.                 v->mb_type[0][s->block_index[i]] = 1;

  3835.             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  3836.             mb_has_coeffs = get_bits1(gb);

  3837.             if (mb_has_coeffs)

  3838.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3839.             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  3840.             GET_MQUANT();

  3841.             s->current_picture.qscale_table[mb_pos] = mquant;

  3842.             /* Set DC scale - y and c use the same (not sure if necessary here) */

  3843.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3844.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3845.             dst_idx = 0;

  3846.             for (i = 0; i < 6; i++) {

  3847.                 s->dc_val[0][s->block_index[i]] = 0;

  3848.                 dst_idx += i >> 2;

  3849.                 val = ((cbp >> (5 - i)) & 1);

  3850.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3851.                 v->a_avail = v->c_avail = 0;

  3852.                 if (i == 2 || i == 3 || !s->first_slice_line)

  3853.                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3854.                 if (i == 1 || i == 3 || s->mb_x)

  3855.                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3856. 

  3857.                 vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3858.                                        (i & 4) ? v->codingset2 : v->codingset);

  3859.                 if ((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3860.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3861.                 if (i < 4) {

  3862.                     stride_y = s->linesize << fieldtx;

  3863.                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  3864.                 } else {

  3865.                     stride_y = s->uvlinesize;

  3866.                     off = 0;

  3867.                 }

  3868.                 s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, stride_y);

  3869.                 //TODO: loop filter

  3870.             }

  3871. 

  3872.         } else { // inter MB

  3873.             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];

  3874.             if (mb_has_coeffs)

  3875.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3876.             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  3877.                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  3878.             } else {

  3879.                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)

  3880.                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {

  3881.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  3882.                 }

  3883.             }

  3884.             s->mb_intra = v->is_intra[s->mb_x] = 0;

  3885.             for (i = 0; i < 6; i++)

  3886.                 v->mb_type[0][s->block_index[i]] = 0;

  3887.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];

  3888.             /* for all motion vector read MVDATA and motion compensate each block */

  3889.             dst_idx = 0;

  3890.             if (fourmv) {

  3891.                 mvbp = v->fourmvbp;

  3892.                 for (i = 0; i < 6; i++) {

  3893.                     if (i < 4) {

  3894.                         dmv_x = dmv_y = 0;

  3895.                         val   = ((mvbp >> (3 - i)) & 1);

  3896.                         if (val) {

  3897.                             get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3898.                         }

  3899.                         vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0);

  3900.                         vc1_mc_4mv_luma(v, i, 0, 0);

  3901.                     } else if (i == 4) {

  3902.                         vc1_mc_4mv_chroma4(v, 0, 0, 0);

  3903.                     }

  3904.                 }

  3905.             } else if (twomv) {

  3906.                 mvbp  = v->twomvbp;

  3907.                 dmv_x = dmv_y = 0;

  3908.                 if (mvbp & 2) {

  3909.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3910.                 }

  3911.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  3912.                 vc1_mc_4mv_luma(v, 0, 0, 0);

  3913.                 vc1_mc_4mv_luma(v, 1, 0, 0);

  3914.                 dmv_x = dmv_y = 0;

  3915.                 if (mvbp & 1) {

  3916.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3917.                 }

  3918.                 vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  3919.                 vc1_mc_4mv_luma(v, 2, 0, 0);

  3920.                 vc1_mc_4mv_luma(v, 3, 0, 0);

  3921.                 vc1_mc_4mv_chroma4(v, 0, 0, 0);

  3922.             } else {

  3923.                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];

  3924.                 dmv_x = dmv_y = 0;

  3925.                 if (mvbp) {

  3926.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3927.                 }

  3928.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  3929.                 vc1_mc_1mv(v, 0);

  3930.             }

  3931.             if (cbp)

  3932.                 GET_MQUANT();  // p. 227

  3933.             s->current_picture.qscale_table[mb_pos] = mquant;

  3934.             if (!v->ttmbf && cbp)

  3935.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3936.             for (i = 0; i < 6; i++) {

  3937.                 s->dc_val[0][s->block_index[i]] = 0;

  3938.                 dst_idx += i >> 2;

  3939.                 val = ((cbp >> (5 - i)) & 1);

  3940.                 if (!fieldtx)

  3941.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3942.                 else

  3943.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  3944.                 if (val) {

  3945.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3946.                                              first_block, s->dest[dst_idx] + off,

  3947.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  3948.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3949.                     block_cbp |= pat << (i << 2);

  3950.                     if (!v->ttmbf && ttmb < 8)

  3951.                         ttmb = -1;

  3952.                     first_block = 0;

  3953.                 }

  3954.             }

  3955.         }

  3956.     } else { // skipped

  3957.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  3958.         for (i = 0; i < 6; i++) {

  3959.             v->mb_type[0][s->block_index[i]] = 0;

  3960.             s->dc_val[0][s->block_index[i]] = 0;

  3961.         }

  3962.         s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3963.         s->current_picture.qscale_table[mb_pos] = 0;

  3964.         v->blk_mv_type[s->block_index[0]] = 0;

  3965.         v->blk_mv_type[s->block_index[1]] = 0;

  3966.         v->blk_mv_type[s->block_index[2]] = 0;

  3967.         v->blk_mv_type[s->block_index[3]] = 0;

  3968.         vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  3969.         vc1_mc_1mv(v, 0);

  3970.     }

  3971.     if (s->mb_x == s->mb_width - 1)

  3972.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);

  3973.     return 0;

  3974. }

  3975. 

  3976. static int vc1_decode_p_mb_intfi(VC1Context *v)

  3977. {

  3978.     MpegEncContext *s = &v->s;

  3979.     GetBitContext *gb = &s->gb;

  3980.     int i;

  3981.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3982.     int cbp = 0; /* cbp decoding stuff */

  3983.     int mqdiff, mquant; /* MB quantization */

  3984.     int ttmb = v->ttfrm; /* MB Transform type */

  3985. 

  3986.     int mb_has_coeffs = 1; /* last_flag */

  3987.     int dmv_x, dmv_y; /* Differential MV components */

  3988.     int val; /* temp values */

  3989.     int first_block = 1;

  3990.     int dst_idx, off;

  3991.     int pred_flag;

  3992.     int block_cbp = 0, pat, block_tt = 0;

  3993.     int idx_mbmode = 0;

  3994. 

  3995.     mquant = v->pq; /* Loosy initialization */

  3996. 

  3997.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  3998.     if (idx_mbmode <= 1) { // intra MB

  3999.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  4000.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  4001.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  4002.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;

  4003.         GET_MQUANT();

  4004.         s->current_picture.qscale_table[mb_pos] = mquant;

  4005.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  4006.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  4007.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  4008.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  4009.         mb_has_coeffs = idx_mbmode & 1;

  4010.         if (mb_has_coeffs)

  4011.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  4012.         dst_idx = 0;

  4013.         for (i = 0; i < 6; i++) {

  4014.             s->dc_val[0][s->block_index[i]]  = 0;

  4015.             v->mb_type[0][s->block_index[i]] = 1;

  4016.             dst_idx += i >> 2;

  4017.             val = ((cbp >> (5 - i)) & 1);

  4018.             v->a_avail = v->c_avail = 0;

  4019.             if (i == 2 || i == 3 || !s->first_slice_line)

  4020.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4021.             if (i == 1 || i == 3 || s->mb_x)

  4022.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4023. 

  4024.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4025.                                    (i & 4) ? v->codingset2 : v->codingset);

  4026.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4027.                 continue;

  4028.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4029.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4030.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  4031.             // TODO: loop filter

  4032.         }

  4033.     } else {

  4034.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4035.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  4036.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  4037.         if (idx_mbmode <= 5) { // 1-MV

  4038.             dmv_x = dmv_y = pred_flag = 0;

  4039.             if (idx_mbmode & 1) {

  4040.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  4041.             }

  4042.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  4043.             vc1_mc_1mv(v, 0);

  4044.             mb_has_coeffs = !(idx_mbmode & 2);

  4045.         } else { // 4-MV

  4046.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4047.             for (i = 0; i < 6; i++) {

  4048.                 if (i < 4) {

  4049.                     dmv_x = dmv_y = pred_flag = 0;

  4050.                     val   = ((v->fourmvbp >> (3 - i)) & 1);

  4051.                     if (val) {

  4052.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  4053.                     }

  4054.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  4055.                     vc1_mc_4mv_luma(v, i, 0, 0);

  4056.                 } else if (i == 4)

  4057.                     vc1_mc_4mv_chroma(v, 0);

  4058.             }

  4059.             mb_has_coeffs = idx_mbmode & 1;

  4060.         }

  4061.         if (mb_has_coeffs)

  4062.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4063.         if (cbp) {

  4064.             GET_MQUANT();

  4065.         }

  4066.         s->current_picture.qscale_table[mb_pos] = mquant;

  4067.         if (!v->ttmbf && cbp) {

  4068.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4069.         }

  4070.         dst_idx = 0;

  4071.         for (i = 0; i < 6; i++) {

  4072.             s->dc_val[0][s->block_index[i]] = 0;

  4073.             dst_idx += i >> 2;

  4074.             val = ((cbp >> (5 - i)) & 1);

  4075.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  4076.             if (val) {

  4077.                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4078.                                          first_block, s->dest[dst_idx] + off,

  4079.                                          (i & 4) ? s->uvlinesize : s->linesize,

  4080.                                          (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  4081.                                          &block_tt);

  4082.                 block_cbp |= pat << (i << 2);

  4083.                 if (!v->ttmbf && ttmb < 8) ttmb = -1;

  4084.                 first_block = 0;

  4085.             }

  4086.         }

  4087.     }

  4088.     if (s->mb_x == s->mb_width - 1)

  4089.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4090.     return 0;

  4091. }

  4092. 

  4093. /** Decode one B-frame MB (in Main profile)

  4094.  */

  4095. static void vc1_decode_b_mb(VC1Context *v)

  4096. {

  4097.     MpegEncContext *s = &v->s;

  4098.     GetBitContext *gb = &s->gb;

  4099.     int i, j;

  4100.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4101.     int cbp = 0; /* cbp decoding stuff */

  4102.     int mqdiff, mquant; /* MB quantization */

  4103.     int ttmb = v->ttfrm; /* MB Transform type */

  4104.     int mb_has_coeffs = 0; /* last_flag */

  4105.     int index, index1; /* LUT indexes */

  4106.     int val, sign; /* temp values */

  4107.     int first_block = 1;

  4108.     int dst_idx, off;

  4109.     int skipped, direct;

  4110.     int dmv_x[2], dmv_y[2];

  4111.     int bmvtype = BMV_TYPE_BACKWARD;

  4112. 

  4113.     mquant      = v->pq; /* lossy initialization */

  4114.     s->mb_intra = 0;

  4115. 

  4116.     if (v->dmb_is_raw)

  4117.         direct = get_bits1(gb);

  4118.     else

  4119.         direct = v->direct_mb_plane[mb_pos];

  4120.     if (v->skip_is_raw)

  4121.         skipped = get_bits1(gb);

  4122.     else

  4123.         skipped = v->s.mbskip_table[mb_pos];

  4124. 

  4125.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4126.     for (i = 0; i < 6; i++) {

  4127.         v->mb_type[0][s->block_index[i]] = 0;

  4128.         s->dc_val[0][s->block_index[i]]  = 0;

  4129.     }

  4130.     s->current_picture.qscale_table[mb_pos] = 0;

  4131. 

  4132.     if (!direct) {

  4133.         if (!skipped) {

  4134.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  4135.             dmv_x[1] = dmv_x[0];

  4136.             dmv_y[1] = dmv_y[0];

  4137.         }

  4138.         if (skipped || !s->mb_intra) {

  4139.             bmvtype = decode012(gb);

  4140.             switch (bmvtype) {

  4141.             case 0:

  4142.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  4143.                 break;

  4144.             case 1:

  4145.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  4146.                 break;

  4147.             case 2:

  4148.                 bmvtype  = BMV_TYPE_INTERPOLATED;

  4149.                 dmv_x[0] = dmv_y[0] = 0;

  4150.             }

  4151.         }

  4152.     }

  4153.     for (i = 0; i < 6; i++)

  4154.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4155. 

  4156.     if (skipped) {

  4157.         if (direct)

  4158.             bmvtype = BMV_TYPE_INTERPOLATED;

  4159.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4160.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4161.         return;

  4162.     }

  4163.     if (direct) {

  4164.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4165.         GET_MQUANT();

  4166.         s->mb_intra = 0;

  4167.         s->current_picture.qscale_table[mb_pos] = mquant;

  4168.         if (!v->ttmbf)

  4169.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4170.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  4171.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4172.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4173.     } else {

  4174.         if (!mb_has_coeffs && !s->mb_intra) {

  4175.             /* no coded blocks - effectively skipped */

  4176.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4177.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4178.             return;

  4179.         }

  4180.         if (s->mb_intra && !mb_has_coeffs) {

  4181.             GET_MQUANT();

  4182.             s->current_picture.qscale_table[mb_pos] = mquant;

  4183.             s->ac_pred = get_bits1(gb);

  4184.             cbp = 0;

  4185.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4186.         } else {

  4187.             if (bmvtype == BMV_TYPE_INTERPOLATED) {

  4188.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  4189.                 if (!mb_has_coeffs) {

  4190.                     /* interpolated skipped block */

  4191.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4192.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4193.                     return;

  4194.                 }

  4195.             }

  4196.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4197.             if (!s->mb_intra) {

  4198.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4199.             }

  4200.             if (s->mb_intra)

  4201.                 s->ac_pred = get_bits1(gb);

  4202.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4203.             GET_MQUANT();

  4204.             s->current_picture.qscale_table[mb_pos] = mquant;

  4205.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  4206.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4207.         }

  4208.     }

  4209.     dst_idx = 0;

  4210.     for (i = 0; i < 6; i++) {

  4211.         s->dc_val[0][s->block_index[i]] = 0;

  4212.         dst_idx += i >> 2;

  4213.         val = ((cbp >> (5 - i)) & 1);

  4214.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4215.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4216.         if (s->mb_intra) {

  4217.             /* check if prediction blocks A and C are available */

  4218.             v->a_avail = v->c_avail = 0;

  4219.             if (i == 2 || i == 3 || !s->first_slice_line)

  4220.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4221.             if (i == 1 || i == 3 || s->mb_x)

  4222.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4223. 

  4224.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4225.                                    (i & 4) ? v->codingset2 : v->codingset);

  4226.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4227.                 continue;

  4228.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4229.             if (v->rangeredfrm)

  4230.                 for (j = 0; j < 64; j++)

  4231.                     s->block[i][j] <<= 1;

  4232.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  4233.         } else if (val) {

  4234.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4235.                                first_block, s->dest[dst_idx] + off,

  4236.                                (i & 4) ? s->uvlinesize : s->linesize,

  4237.                                (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4238.             if (!v->ttmbf && ttmb < 8)

  4239.                 ttmb = -1;

  4240.             first_block = 0;

  4241.         }

  4242.     }

  4243. }

  4244. 

  4245. /** Decode one B-frame MB (in interlaced field B picture)

  4246.  */

  4247. static void vc1_decode_b_mb_intfi(VC1Context *v)

  4248. {

  4249.     MpegEncContext *s = &v->s;

  4250.     GetBitContext *gb = &s->gb;

  4251.     int i, j;

  4252.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4253.     int cbp = 0; /* cbp decoding stuff */

  4254.     int mqdiff, mquant; /* MB quantization */

  4255.     int ttmb = v->ttfrm; /* MB Transform type */

  4256.     int mb_has_coeffs = 0; /* last_flag */

  4257.     int val; /* temp value */

  4258.     int first_block = 1;

  4259.     int dst_idx, off;

  4260.     int fwd;

  4261.     int dmv_x[2], dmv_y[2], pred_flag[2];

  4262.     int bmvtype = BMV_TYPE_BACKWARD;

  4263.     int idx_mbmode, interpmvp;

  4264. 

  4265.     mquant      = v->pq; /* Loosy initialization */

  4266.     s->mb_intra = 0;

  4267. 

  4268.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  4269.     if (idx_mbmode <= 1) { // intra MB

  4270.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  4271.         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  4272.         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  4273.         s->current_picture.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;

  4274.         GET_MQUANT();

  4275.         s->current_picture.qscale_table[mb_pos] = mquant;

  4276.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  4277.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  4278.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  4279.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  4280.         mb_has_coeffs = idx_mbmode & 1;

  4281.         if (mb_has_coeffs)

  4282.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  4283.         dst_idx = 0;

  4284.         for (i = 0; i < 6; i++) {

  4285.             s->dc_val[0][s->block_index[i]] = 0;

  4286.             dst_idx += i >> 2;

  4287.             val = ((cbp >> (5 - i)) & 1);

  4288.             v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4289.             v->a_avail                       = v->c_avail = 0;

  4290.             if (i == 2 || i == 3 || !s->first_slice_line)

  4291.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4292.             if (i == 1 || i == 3 || s->mb_x)

  4293.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4294. 

  4295.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4296.                                    (i & 4) ? v->codingset2 : v->codingset);

  4297.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4298.                 continue;

  4299.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4300.             if (v->rangeredfrm)

  4301.                 for (j = 0; j < 64; j++)

  4302.                     s->block[i][j] <<= 1;

  4303.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4304.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  4305.             // TODO: yet to perform loop filter

  4306.         }

  4307.     } else {

  4308.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4309.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  4310.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  4311.         if (v->fmb_is_raw)

  4312.             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);

  4313.         else

  4314.             fwd = v->forward_mb_plane[mb_pos];

  4315.         if (idx_mbmode <= 5) { // 1-MV

  4316.             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4317.             pred_flag[0] = pred_flag[1] = 0;

  4318.             if (fwd)

  4319.                 bmvtype = BMV_TYPE_FORWARD;

  4320.             else {

  4321.                 bmvtype = decode012(gb);

  4322.                 switch (bmvtype) {

  4323.                 case 0:

  4324.                     bmvtype = BMV_TYPE_BACKWARD;

  4325.                     break;

  4326.                 case 1:

  4327.                     bmvtype = BMV_TYPE_DIRECT;

  4328.                     break;

  4329.                 case 2:

  4330.                     bmvtype   = BMV_TYPE_INTERPOLATED;

  4331.                     interpmvp = get_bits1(gb);

  4332.                 }

  4333.             }

  4334.             v->bmvtype = bmvtype;

  4335.             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {

  4336.                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4337.             }

  4338.             if (bmvtype == BMV_TYPE_INTERPOLATED && interpmvp) {

  4339.                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);

  4340.             }

  4341.             if (bmvtype == BMV_TYPE_DIRECT) {

  4342.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4343.                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;

  4344.             }

  4345.             vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);

  4346.             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);

  4347.             mb_has_coeffs = !(idx_mbmode & 2);

  4348.         } else { // 4-MV

  4349.             if (fwd)

  4350.                 bmvtype = BMV_TYPE_FORWARD;

  4351.             v->bmvtype  = bmvtype;

  4352.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4353.             for (i = 0; i < 6; i++) {

  4354.                 if (i < 4) {

  4355.                     dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4356.                     dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;

  4357.                     val = ((v->fourmvbp >> (3 - i)) & 1);

  4358.                     if (val) {

  4359.                         get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],

  4360.                                                  &dmv_y[bmvtype == BMV_TYPE_BACKWARD],

  4361.                                              &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4362.                     }

  4363.                     vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);

  4364.                     vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD, 0);

  4365.                 } else if (i == 4)

  4366.                     vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);

  4367.             }

  4368.             mb_has_coeffs = idx_mbmode & 1;

  4369.         }

  4370.         if (mb_has_coeffs)

  4371.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4372.         if (cbp) {

  4373.             GET_MQUANT();

  4374.         }

  4375.         s->current_picture.qscale_table[mb_pos] = mquant;

  4376.         if (!v->ttmbf && cbp) {

  4377.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4378.         }

  4379.         dst_idx = 0;

  4380.         for (i = 0; i < 6; i++) {

  4381.             s->dc_val[0][s->block_index[i]] = 0;

  4382.             dst_idx += i >> 2;

  4383.             val = ((cbp >> (5 - i)) & 1);

  4384.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  4385.             if (val) {

  4386.                 vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4387.                                    first_block, s->dest[dst_idx] + off,

  4388.                                    (i & 4) ? s->uvlinesize : s->linesize,

  4389.                                    (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4390.                 if (!v->ttmbf && ttmb < 8)

  4391.                     ttmb = -1;

  4392.                 first_block = 0;

  4393.             }

  4394.         }

  4395.     }

  4396. }

  4397. 

  4398. /** Decode one B-frame MB (in interlaced frame B picture)

  4399.  */

  4400. static int vc1_decode_b_mb_intfr(VC1Context *v)

  4401. {

  4402.     MpegEncContext *s = &v->s;

  4403.     GetBitContext *gb = &s->gb;

  4404.     int i, j;

  4405.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4406.     int cbp = 0; /* cbp decoding stuff */

  4407.     int mqdiff, mquant; /* MB quantization */

  4408.     int ttmb = v->ttfrm; /* MB Transform type */

  4409.     int mvsw = 0; /* motion vector switch */

  4410.     int mb_has_coeffs = 1; /* last_flag */

  4411.     int dmv_x, dmv_y; /* Differential MV components */

  4412.     int val; /* temp value */

  4413.     int first_block = 1;

  4414.     int dst_idx, off;

  4415.     int skipped, direct, twomv = 0;

  4416.     int block_cbp = 0, pat, block_tt = 0;

  4417.     int idx_mbmode = 0, mvbp;

  4418.     int stride_y, fieldtx;

  4419.     int bmvtype = BMV_TYPE_BACKWARD;

  4420.     int dir, dir2;

  4421. 

  4422.     mquant = v->pq; /* Lossy initialization */

  4423.     s->mb_intra = 0;

  4424.     if (v->skip_is_raw)

  4425.         skipped = get_bits1(gb);

  4426.     else

  4427.         skipped = v->s.mbskip_table[mb_pos];

  4428. 

  4429.     if (!skipped) {

  4430.         idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);

  4431.         if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  4432.             twomv = 1;

  4433.             v->blk_mv_type[s->block_index[0]] = 1;

  4434.             v->blk_mv_type[s->block_index[1]] = 1;

  4435.             v->blk_mv_type[s->block_index[2]] = 1;

  4436.             v->blk_mv_type[s->block_index[3]] = 1;

  4437.         } else {

  4438.             v->blk_mv_type[s->block_index[0]] = 0;

  4439.             v->blk_mv_type[s->block_index[1]] = 0;

  4440.             v->blk_mv_type[s->block_index[2]] = 0;

  4441.             v->blk_mv_type[s->block_index[3]] = 0;

  4442.         }

  4443.     }

  4444. 

  4445.     if (v->dmb_is_raw)

  4446.         direct = get_bits1(gb);

  4447.     else

  4448.         direct = v->direct_mb_plane[mb_pos];

  4449. 

  4450.     if (direct) {

  4451.         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);

  4452.         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);

  4453.         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);

  4454.         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);

  4455. 

  4456.         if (twomv) {

  4457.             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);

  4458.             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);

  4459.             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);

  4460.             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);

  4461. 

  4462.             for (i = 1; i < 4; i += 2) {

  4463.                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];

  4464.                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];

  4465.                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];

  4466.                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];

  4467.             }

  4468.         } else {

  4469.             for (i = 1; i < 4; i++) {

  4470.                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];

  4471.                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];

  4472.                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];

  4473.                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];

  4474.             }

  4475.         }

  4476.     }

  4477. 

  4478.     if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  4479.         for (i = 0; i < 4; i++) {

  4480.             s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;

  4481.             s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;

  4482.             s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  4483.             s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  4484.         }

  4485.         s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  4486.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  4487.         for (i = 0; i < 6; i++)

  4488.             v->mb_type[0][s->block_index[i]] = 1;

  4489.         fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  4490.         mb_has_coeffs = get_bits1(gb);

  4491.         if (mb_has_coeffs)

  4492.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4493.         v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  4494.         GET_MQUANT();

  4495.         s->current_picture.qscale_table[mb_pos] = mquant;

  4496.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  4497.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  4498.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  4499.         dst_idx = 0;

  4500.         for (i = 0; i < 6; i++) {

  4501.             s->dc_val[0][s->block_index[i]] = 0;

  4502.             dst_idx += i >> 2;

  4503.             val = ((cbp >> (5 - i)) & 1);

  4504.             v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4505.             v->a_avail = v->c_avail = 0;

  4506.             if (i == 2 || i == 3 || !s->first_slice_line)

  4507.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4508.             if (i == 1 || i == 3 || s->mb_x)

  4509.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4510. 

  4511.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4512.                                    (i & 4) ? v->codingset2 : v->codingset);

  4513.             if (i > 3 && (s->flags & CODEC_FLAG_GRAY))

  4514.                 continue;

  4515.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4516.             if (i < 4) {

  4517.                 stride_y = s->linesize << fieldtx;

  4518.                 off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  4519.             } else {

  4520.                 stride_y = s->uvlinesize;

  4521.                 off = 0;

  4522.             }

  4523.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, stride_y);

  4524.         }

  4525.     } else {

  4526.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4527.         if (!direct) {

  4528.             if (skipped || !s->mb_intra) {

  4529.                 bmvtype = decode012(gb);

  4530.                 switch (bmvtype) {

  4531.                 case 0:

  4532.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  4533.                     break;

  4534.                 case 1:

  4535.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  4536.                     break;

  4537.                 case 2:

  4538.                     bmvtype  = BMV_TYPE_INTERPOLATED;

  4539.                 }

  4540.             }

  4541. 

  4542.             if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)

  4543.                 mvsw = get_bits1(gb);

  4544.         }

  4545. 

  4546.         if (!skipped) { // inter MB

  4547.             mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];

  4548.             if (mb_has_coeffs)

  4549.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4550.             if (!direct) {

  4551.                 if (bmvtype == BMV_TYPE_INTERPOLATED & twomv) {

  4552.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4553.                 } else if (bmvtype == BMV_TYPE_INTERPOLATED | twomv) {

  4554.                     v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  4555.                 }

  4556.             }

  4557. 

  4558.             for (i = 0; i < 6; i++)

  4559.                 v->mb_type[0][s->block_index[i]] = 0;

  4560.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];

  4561.             /* for all motion vector read MVDATA and motion compensate each block */

  4562.             dst_idx = 0;

  4563.             if (direct) {

  4564.                 if (twomv) {

  4565.                     for (i = 0; i < 4; i++) {

  4566.                         vc1_mc_4mv_luma(v, i, 0, 0);

  4567.                         vc1_mc_4mv_luma(v, i, 1, 1);

  4568.                     }

  4569.                     vc1_mc_4mv_chroma4(v, 0, 0, 0);

  4570.                     vc1_mc_4mv_chroma4(v, 1, 1, 1);

  4571.                 } else {

  4572.                     vc1_mc_1mv(v, 0);

  4573.                     vc1_interp_mc(v);

  4574.                 }

  4575.             } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {

  4576.                 mvbp = v->fourmvbp;

  4577.                 for (i = 0; i < 4; i++) {

  4578.                     dir = i==1 || i==3;

  4579.                     dmv_x = dmv_y = 0;

  4580.                     val = ((mvbp >> (3 - i)) & 1);

  4581.                     if (val)

  4582.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4583.                     j = i > 1 ? 2 : 0;

  4584.                     vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  4585.                     vc1_mc_4mv_luma(v, j, dir, dir);

  4586.                     vc1_mc_4mv_luma(v, j+1, dir, dir);

  4587.                 }

  4588. 

  4589.                 vc1_mc_4mv_chroma4(v, 0, 0, 0);

  4590.                 vc1_mc_4mv_chroma4(v, 1, 1, 1);

  4591.             } else if (bmvtype == BMV_TYPE_INTERPOLATED) {

  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, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  4598.                 vc1_mc_1mv(v, 0);

  4599. 

  4600.                 dmv_x = dmv_y = 0;

  4601.                 if (mvbp & 1)

  4602.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4603. 

  4604.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  4605.                 vc1_interp_mc(v);

  4606.             } else if (twomv) {

  4607.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  4608.                 dir2 = dir;

  4609.                 if (mvsw)

  4610.                     dir2 = !dir;

  4611.                 mvbp = v->twomvbp;

  4612.                 dmv_x = dmv_y = 0;

  4613.                 if (mvbp & 2)

  4614.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4615.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  4616. 

  4617.                 dmv_x = dmv_y = 0;

  4618.                 if (mvbp & 1)

  4619.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4620.                 vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);

  4621. 

  4622.                 if (mvsw) {

  4623.                     for (i = 0; i < 2; i++) {

  4624.                         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];

  4625.                         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];

  4626.                         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];

  4627.                         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];

  4628.                     }

  4629.                 } else {

  4630.                     vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  4631.                     vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  4632.                 }

  4633. 

  4634.                 vc1_mc_4mv_luma(v, 0, dir, 0);

  4635.                 vc1_mc_4mv_luma(v, 1, dir, 0);

  4636.                 vc1_mc_4mv_luma(v, 2, dir2, 0);

  4637.                 vc1_mc_4mv_luma(v, 3, dir2, 0);

  4638.                 vc1_mc_4mv_chroma4(v, dir, dir2, 0);

  4639.             } else {

  4640.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  4641. 

  4642.                 mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];

  4643.                 dmv_x = dmv_y = 0;

  4644.                 if (mvbp)

  4645.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  4646. 

  4647.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  4648.                 v->blk_mv_type[s->block_index[0]] = 1;

  4649.                 v->blk_mv_type[s->block_index[1]] = 1;

  4650.                 v->blk_mv_type[s->block_index[2]] = 1;

  4651.                 v->blk_mv_type[s->block_index[3]] = 1;

  4652.                 vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  4653.                 for (i = 0; i < 2; i++) {

  4654.                     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];

  4655.                     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];

  4656.                 }

  4657.                 vc1_mc_1mv(v, dir);

  4658.             }

  4659. 

  4660.             if (cbp)

  4661.                 GET_MQUANT();  // p. 227

  4662.             s->current_picture.qscale_table[mb_pos] = mquant;

  4663.             if (!v->ttmbf && cbp)

  4664.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4665.             for (i = 0; i < 6; i++) {

  4666.                 s->dc_val[0][s->block_index[i]] = 0;

  4667.                 dst_idx += i >> 2;

  4668.                 val = ((cbp >> (5 - i)) & 1);

  4669.                 if (!fieldtx)

  4670.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4671.                 else

  4672.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  4673.                 if (val) {

  4674.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4675.                                              first_block, s->dest[dst_idx] + off,

  4676.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  4677.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  4678.                     block_cbp |= pat << (i << 2);

  4679.                     if (!v->ttmbf && ttmb < 8)

  4680.                         ttmb = -1;

  4681.                     first_block = 0;

  4682.                 }

  4683.             }

  4684. 

  4685.         } else { // skipped

  4686.             dir = 0;

  4687.             for (i = 0; i < 6; i++) {

  4688.                 v->mb_type[0][s->block_index[i]] = 0;

  4689.                 s->dc_val[0][s->block_index[i]] = 0;

  4690.             }

  4691.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  4692.             s->current_picture.qscale_table[mb_pos] = 0;

  4693.             v->blk_mv_type[s->block_index[0]] = 0;

  4694.             v->blk_mv_type[s->block_index[1]] = 0;

  4695.             v->blk_mv_type[s->block_index[2]] = 0;

  4696.             v->blk_mv_type[s->block_index[3]] = 0;

  4697. 

  4698.             if (!direct) {

  4699.                 if (bmvtype == BMV_TYPE_INTERPOLATED) {

  4700.                     vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  4701.                     vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  4702.                 } else {

  4703.                     dir = bmvtype == BMV_TYPE_BACKWARD;

  4704.                     vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  4705.                     if (mvsw) {

  4706.                         int dir2 = dir;

  4707.                         if (mvsw)

  4708.                             dir2 = !dir;

  4709.                         for (i = 0; i < 2; i++) {

  4710.                             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];

  4711.                             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];

  4712.                             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];

  4713.                             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];

  4714.                         }

  4715.                     } else {

  4716.                         v->blk_mv_type[s->block_index[0]] = 1;

  4717.                         v->blk_mv_type[s->block_index[1]] = 1;

  4718.                         v->blk_mv_type[s->block_index[2]] = 1;

  4719.                         v->blk_mv_type[s->block_index[3]] = 1;

  4720.                         vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  4721.                         for (i = 0; i < 2; i++) {

  4722.                             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];

  4723.                             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];

  4724.                         }

  4725.                     }

  4726.                 }

  4727.             }

  4728. 

  4729.             vc1_mc_1mv(v, dir);

  4730.             if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {

  4731.                 vc1_interp_mc(v);

  4732.             }

  4733.         }

  4734.     }

  4735.     if (s->mb_x == s->mb_width - 1)

  4736.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4737.     v->cbp[s->mb_x]      = block_cbp;

  4738.     v->ttblk[s->mb_x]    = block_tt;

  4739.     return 0;

  4740. }

  4741. 

  4742. /** Decode blocks of I-frame

  4743.  */

  4744. static void vc1_decode_i_blocks(VC1Context *v)

  4745. {

  4746.     int k, j;

  4747.     MpegEncContext *s = &v->s;

  4748.     int cbp, val;

  4749.     uint8_t *coded_val;

  4750.     int mb_pos;

  4751. 

  4752.     /* select codingmode used for VLC tables selection */

  4753.     switch (v->y_ac_table_index) {

  4754.     case 0:

  4755.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4756.         break;

  4757.     case 1:

  4758.         v->codingset = CS_HIGH_MOT_INTRA;

  4759.         break;

  4760.     case 2:

  4761.         v->codingset = CS_MID_RATE_INTRA;

  4762.         break;

  4763.     }

  4764. 

  4765.     switch (v->c_ac_table_index) {

  4766.     case 0:

  4767.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4768.         break;

  4769.     case 1:

  4770.         v->codingset2 = CS_HIGH_MOT_INTER;

  4771.         break;

  4772.     case 2:

  4773.         v->codingset2 = CS_MID_RATE_INTER;

  4774.         break;

  4775.     }

  4776. 

  4777.     /* Set DC scale - y and c use the same */

  4778.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  4779.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  4780. 

  4781.     //do frame decode

  4782.     s->mb_x = s->mb_y = 0;

  4783.     s->mb_intra         = 1;

  4784.     s->first_slice_line = 1;

  4785.     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {

  4786.         s->mb_x = 0;

  4787.         init_block_index(v);

  4788.         for (; s->mb_x < v->end_mb_x; s->mb_x++) {

  4789.             uint8_t *dst[6];

  4790.             ff_update_block_index(s);

  4791.             dst[0] = s->dest[0];

  4792.             dst[1] = dst[0] + 8;

  4793.             dst[2] = s->dest[0] + s->linesize * 8;

  4794.             dst[3] = dst[2] + 8;

  4795.             dst[4] = s->dest[1];

  4796.             dst[5] = s->dest[2];

  4797.             s->dsp.clear_blocks(s->block[0]);

  4798.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  4799.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  4800.             s->current_picture.qscale_table[mb_pos]                = v->pq;

  4801.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  4802.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  4803. 

  4804.             // do actual MB decoding and displaying

  4805.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4806.             v->s.ac_pred = get_bits1(&v->s.gb);

  4807. 

  4808.             for (k = 0; k < 6; k++) {

  4809.                 val = ((cbp >> (5 - k)) & 1);

  4810. 

  4811.                 if (k < 4) {

  4812.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4813.                     val        = val ^ pred;

  4814.                     *coded_val = val;

  4815.                 }

  4816.                 cbp |= val << (5 - k);

  4817. 

  4818.                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);

  4819. 

  4820.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4821.                     continue;

  4822.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);

  4823.                 if (v->pq >= 9 && v->overlap) {

  4824.                     if (v->rangeredfrm)

  4825.                         for (j = 0; j < 64; j++)

  4826.                             s->block[k][j] <<= 1;

  4827.                     s->dsp.put_signed_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4828.                 } else {

  4829.                     if (v->rangeredfrm)

  4830.                         for (j = 0; j < 64; j++)

  4831.                             s->block[k][j] = (s->block[k][j] - 64) << 1;

  4832.                     s->dsp.put_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4833.                 }

  4834.             }

  4835. 

  4836.             if (v->pq >= 9 && v->overlap) {

  4837.                 if (s->mb_x) {

  4838.                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);

  4839.                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4840.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4841.                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  4842.                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  4843.                     }

  4844.                 }

  4845.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  4846.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4847.                 if (!s->first_slice_line) {

  4848.                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);

  4849.                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  4850.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4851.                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  4852.                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  4853.                     }

  4854.                 }

  4855.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4856.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4857.             }

  4858.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  4859. 

  4860.             if (get_bits_count(&s->gb) > v->bits) {

  4861.                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);

  4862.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4863.                        get_bits_count(&s->gb), v->bits);

  4864.                 return;

  4865.             }

  4866.         }

  4867.         if (!v->s.loop_filter)

  4868.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  4869.         else if (s->mb_y)

  4870.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4871. 

  4872.         s->first_slice_line = 0;

  4873.     }

  4874.     if (v->s.loop_filter)

  4875.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4876. 

  4877.     /* This is intentionally mb_height and not end_mb_y - unlike in advanced

  4878.      * profile, these only differ are when decoding MSS2 rectangles. */

  4879.     ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);

  4880. }

  4881. 

  4882. /** Decode blocks of I-frame for advanced profile

  4883.  */

  4884. static void vc1_decode_i_blocks_adv(VC1Context *v)

  4885. {

  4886.     int k;

  4887.     MpegEncContext *s = &v->s;

  4888.     int cbp, val;

  4889.     uint8_t *coded_val;

  4890.     int mb_pos;

  4891.     int mquant = v->pq;

  4892.     int mqdiff;

  4893.     GetBitContext *gb = &s->gb;

  4894. 

  4895.     /* select codingmode used for VLC tables selection */

  4896.     switch (v->y_ac_table_index) {

  4897.     case 0:

  4898.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4899.         break;

  4900.     case 1:

  4901.         v->codingset = CS_HIGH_MOT_INTRA;

  4902.         break;

  4903.     case 2:

  4904.         v->codingset = CS_MID_RATE_INTRA;

  4905.         break;

  4906.     }

  4907. 

  4908.     switch (v->c_ac_table_index) {

  4909.     case 0:

  4910.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4911.         break;

  4912.     case 1:

  4913.         v->codingset2 = CS_HIGH_MOT_INTER;

  4914.         break;

  4915.     case 2:

  4916.         v->codingset2 = CS_MID_RATE_INTER;

  4917.         break;

  4918.     }

  4919. 

  4920.     // do frame decode

  4921.     s->mb_x             = s->mb_y = 0;

  4922.     s->mb_intra         = 1;

  4923.     s->first_slice_line = 1;

  4924.     s->mb_y             = s->start_mb_y;

  4925.     if (s->start_mb_y) {

  4926.         s->mb_x = 0;

  4927.         init_block_index(v);

  4928.         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,

  4929.                (1 + s->b8_stride) * sizeof(*s->coded_block));

  4930.     }

  4931.     for (; s->mb_y < s->end_mb_y; s->mb_y++) {

  4932.         s->mb_x = 0;

  4933.         init_block_index(v);

  4934.         for (;s->mb_x < s->mb_width; s->mb_x++) {

  4935.             int16_t (*block)[64] = v->block[v->cur_blk_idx];

  4936.             ff_update_block_index(s);

  4937.             s->dsp.clear_blocks(block[0]);

  4938.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4939.             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;

  4940.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  4941.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  4942. 

  4943.             // do actual MB decoding and displaying

  4944.             if (v->fieldtx_is_raw)

  4945.                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);

  4946.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4947.             if ( v->acpred_is_raw)

  4948.                 v->s.ac_pred = get_bits1(&v->s.gb);

  4949.             else

  4950.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  4951. 

  4952.             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)

  4953.                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);

  4954. 

  4955.             GET_MQUANT();

  4956. 

  4957.             s->current_picture.qscale_table[mb_pos] = mquant;

  4958.             /* Set DC scale - y and c use the same */

  4959.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  4960.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  4961. 

  4962.             for (k = 0; k < 6; k++) {

  4963.                 val = ((cbp >> (5 - k)) & 1);

  4964. 

  4965.                 if (k < 4) {

  4966.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4967.                     val        = val ^ pred;

  4968.                     *coded_val = val;

  4969.                 }

  4970.                 cbp |= val << (5 - k);

  4971. 

  4972.                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);

  4973.                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);

  4974. 

  4975.                 vc1_decode_i_block_adv(v, block[k], k, val,

  4976.                                        (k < 4) ? v->codingset : v->codingset2, mquant);

  4977. 

  4978.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4979.                     continue;

  4980.                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);

  4981.             }

  4982. 

  4983.             vc1_smooth_overlap_filter_iblk(v);

  4984.             vc1_put_signed_blocks_clamped(v);

  4985.             if (v->s.loop_filter) vc1_loop_filter_iblk_delayed(v, v->pq);

  4986. 

  4987.             if (get_bits_count(&s->gb) > v->bits) {

  4988.                 // TODO: may need modification to handle slice coding

  4989.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4990.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4991.                        get_bits_count(&s->gb), v->bits);

  4992.                 return;

  4993.             }

  4994.         }

  4995.         if (!v->s.loop_filter)

  4996.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  4997.         else if (s->mb_y)

  4998.             ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);

  4999.         s->first_slice_line = 0;

  5000.     }

  5001. 

  5002.     /* raw bottom MB row */

  5003.     s->mb_x = 0;

  5004.     init_block_index(v);

  5005. 

  5006.     for (;s->mb_x < s->mb_width; s->mb_x++) {

  5007.         ff_update_block_index(s);

  5008.         vc1_put_signed_blocks_clamped(v);

  5009.         if (v->s.loop_filter)

  5010.             vc1_loop_filter_iblk_delayed(v, v->pq);

  5011.     }

  5012.     if (v->s.loop_filter)

  5013.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y-1)*16, 16);

  5014.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  5015.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  5016. }

  5017. 

  5018. static void vc1_decode_p_blocks(VC1Context *v)

  5019. {

  5020.     MpegEncContext *s = &v->s;

  5021.     int apply_loop_filter;

  5022. 

  5023.     /* select codingmode used for VLC tables selection */

  5024.     switch (v->c_ac_table_index) {

  5025.     case 0:

  5026.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  5027.         break;

  5028.     case 1:

  5029.         v->codingset = CS_HIGH_MOT_INTRA;

  5030.         break;

  5031.     case 2:

  5032.         v->codingset = CS_MID_RATE_INTRA;

  5033.         break;

  5034.     }

  5035. 

  5036.     switch (v->c_ac_table_index) {

  5037.     case 0:

  5038.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  5039.         break;

  5040.     case 1:

  5041.         v->codingset2 = CS_HIGH_MOT_INTER;

  5042.         break;

  5043.     case 2:

  5044.         v->codingset2 = CS_MID_RATE_INTER;

  5045.         break;

  5046.     }

  5047. 

  5048.     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY) &&

  5049.                           v->fcm == PROGRESSIVE;

  5050.     s->first_slice_line = 1;

  5051.     memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);

  5052.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  5053.         s->mb_x = 0;

  5054.         init_block_index(v);

  5055.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  5056.             ff_update_block_index(s);

  5057. 

  5058.             if (v->fcm == ILACE_FIELD)

  5059.                 vc1_decode_p_mb_intfi(v);

  5060.             else if (v->fcm == ILACE_FRAME)

  5061.                 vc1_decode_p_mb_intfr(v);

  5062.             else vc1_decode_p_mb(v);

  5063.             if (s->mb_y != s->start_mb_y && apply_loop_filter)

  5064.                 vc1_apply_p_loop_filter(v);

  5065.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  5066.                 // TODO: may need modification to handle slice coding

  5067.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  5068.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  5069.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  5070.                 return;

  5071.             }

  5072.         }

  5073.         memmove(v->cbp_base,      v->cbp,      sizeof(v->cbp_base[0])      * s->mb_stride);

  5074.         memmove(v->ttblk_base,    v->ttblk,    sizeof(v->ttblk_base[0])    * s->mb_stride);

  5075.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  5076.         memmove(v->luma_mv_base,  v->luma_mv,  sizeof(v->luma_mv_base[0])  * s->mb_stride);

  5077.         if (s->mb_y != s->start_mb_y) ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  5078.         s->first_slice_line = 0;

  5079.     }

  5080.     if (apply_loop_filter) {

  5081.         s->mb_x = 0;

  5082.         init_block_index(v);

  5083.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  5084.             ff_update_block_index(s);

  5085.             vc1_apply_p_loop_filter(v);

  5086.         }

  5087.     }

  5088.     if (s->end_mb_y >= s->start_mb_y)

  5089.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  5090.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  5091.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  5092. }

  5093. 

  5094. static void vc1_decode_b_blocks(VC1Context *v)

  5095. {

  5096.     MpegEncContext *s = &v->s;

  5097. 

  5098.     /* select codingmode used for VLC tables selection */

  5099.     switch (v->c_ac_table_index) {

  5100.     case 0:

  5101.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  5102.         break;

  5103.     case 1:

  5104.         v->codingset = CS_HIGH_MOT_INTRA;

  5105.         break;

  5106.     case 2:

  5107.         v->codingset = CS_MID_RATE_INTRA;

  5108.         break;

  5109.     }

  5110. 

  5111.     switch (v->c_ac_table_index) {

  5112.     case 0:

  5113.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  5114.         break;

  5115.     case 1:

  5116.         v->codingset2 = CS_HIGH_MOT_INTER;

  5117.         break;

  5118.     case 2:

  5119.         v->codingset2 = CS_MID_RATE_INTER;

  5120.         break;

  5121.     }

  5122. 

  5123.     s->first_slice_line = 1;

  5124.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  5125.         s->mb_x = 0;

  5126.         init_block_index(v);

  5127.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  5128.             ff_update_block_index(s);

  5129. 

  5130.             if (v->fcm == ILACE_FIELD)

  5131.                 vc1_decode_b_mb_intfi(v);

  5132.             else if (v->fcm == ILACE_FRAME)

  5133.                 vc1_decode_b_mb_intfr(v);

  5134.             else

  5135.                 vc1_decode_b_mb(v);

  5136.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  5137.                 // TODO: may need modification to handle slice coding

  5138.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  5139.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  5140.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  5141.                 return;

  5142.             }

  5143.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  5144.         }

  5145.         if (!v->s.loop_filter)

  5146.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  5147.         else if (s->mb_y)

  5148.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  5149.         s->first_slice_line = 0;

  5150.     }

  5151.     if (v->s.loop_filter)

  5152.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  5153.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  5154.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  5155. }

  5156. 

  5157. static void vc1_decode_skip_blocks(VC1Context *v)

  5158. {

  5159.     MpegEncContext *s = &v->s;

  5160. 

  5161.     if (!v->s.last_picture.f.data[0])

  5162.         return;

  5163. 

  5164.     ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);

  5165.     s->first_slice_line = 1;

  5166.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  5167.         s->mb_x = 0;

  5168.         init_block_index(v);

  5169.         ff_update_block_index(s);

  5170.         memcpy(s->dest[0], s->last_picture.f.data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);

  5171.         memcpy(s->dest[1], s->last_picture.f.data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  5172.         memcpy(s->dest[2], s->last_picture.f.data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  5173.         ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  5174.         s->first_slice_line = 0;

  5175.     }

  5176.     s->pict_type = AV_PICTURE_TYPE_P;

  5177. }

  5178. 

  5179. void ff_vc1_decode_blocks(VC1Context *v)

  5180. {

  5181. 

  5182.     v->s.esc3_level_length = 0;

  5183.     if (v->x8_type) {

  5184.         ff_intrax8_decode_picture(&v->x8, 2*v->pq + v->halfpq, v->pq * !v->pquantizer);

  5185.     } else {

  5186.         v->cur_blk_idx     =  0;

  5187.         v->left_blk_idx    = -1;

  5188.         v->topleft_blk_idx =  1;

  5189.         v->top_blk_idx     =  2;

  5190.         switch (v->s.pict_type) {

  5191.         case AV_PICTURE_TYPE_I:

  5192.             if (v->profile == PROFILE_ADVANCED)

  5193.                 vc1_decode_i_blocks_adv(v);

  5194.             else

  5195.                 vc1_decode_i_blocks(v);

  5196.             break;

  5197.         case AV_PICTURE_TYPE_P:

  5198.             if (v->p_frame_skipped)

  5199.                 vc1_decode_skip_blocks(v);

  5200.             else

  5201.                 vc1_decode_p_blocks(v);

  5202.             break;

  5203.         case AV_PICTURE_TYPE_B:

  5204.             if (v->bi_type) {

  5205.                 if (v->profile == PROFILE_ADVANCED)

  5206.                     vc1_decode_i_blocks_adv(v);

  5207.                 else

  5208.                     vc1_decode_i_blocks(v);

  5209.             } else

  5210.                 vc1_decode_b_blocks(v);

  5211.             break;

  5212.         }

  5213.     }

  5214. }

  5215. 

  5216. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  5217. 

  5218. typedef struct {

  5219.     /**

  5220.      * Transform coefficients for both sprites in 16.16 fixed point format,

  5221.      * in the order they appear in the bitstream:

  5222.      *  x scale

  5223.      *  rotation 1 (unused)

  5224.      *  x offset

  5225.      *  rotation 2 (unused)

  5226.      *  y scale

  5227.      *  y offset

  5228.      *  alpha

  5229.      */

  5230.     int coefs[2][7];

  5231. 

  5232.     int effect_type, effect_flag;

  5233.     int effect_pcount1, effect_pcount2;   ///< amount of effect parameters stored in effect_params

  5234.     int effect_params1[15], effect_params2[10]; ///< effect parameters in 16.16 fixed point format

  5235. } SpriteData;

  5236. 

  5237. static inline int get_fp_val(GetBitContext* gb)

  5238. {

  5239.     return (get_bits_long(gb, 30) - (1 << 29)) << 1;

  5240. }

  5241. 

  5242. static void vc1_sprite_parse_transform(GetBitContext* gb, int c[7])

  5243. {

  5244.     c[1] = c[3] = 0;

  5245. 

  5246.     switch (get_bits(gb, 2)) {

  5247.     case 0:

  5248.         c[0] = 1 << 16;

  5249.         c[2] = get_fp_val(gb);

  5250.         c[4] = 1 << 16;

  5251.         break;

  5252.     case 1:

  5253.         c[0] = c[4] = get_fp_val(gb);

  5254.         c[2] = get_fp_val(gb);

  5255.         break;

  5256.     case 2:

  5257.         c[0] = get_fp_val(gb);

  5258.         c[2] = get_fp_val(gb);

  5259.         c[4] = get_fp_val(gb);

  5260.         break;

  5261.     case 3:

  5262.         c[0] = get_fp_val(gb);

  5263.         c[1] = get_fp_val(gb);

  5264.         c[2] = get_fp_val(gb);

  5265.         c[3] = get_fp_val(gb);

  5266.         c[4] = get_fp_val(gb);

  5267.         break;

  5268.     }

  5269.     c[5] = get_fp_val(gb);

  5270.     if (get_bits1(gb))

  5271.         c[6] = get_fp_val(gb);

  5272.     else

  5273.         c[6] = 1 << 16;

  5274. }

  5275. 

  5276. static void vc1_parse_sprites(VC1Context *v, GetBitContext* gb, SpriteData* sd)

  5277. {

  5278.     AVCodecContext *avctx = v->s.avctx;

  5279.     int sprite, i;

  5280. 

  5281.     for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  5282.         vc1_sprite_parse_transform(gb, sd->coefs[sprite]);

  5283.         if (sd->coefs[sprite][1] || sd->coefs[sprite][3])

  5284.             avpriv_request_sample(avctx, "Non-zero rotation coefficients");

  5285.         av_log(avctx, AV_LOG_DEBUG, sprite ? "S2:" : "S1:");

  5286.         for (i = 0; i < 7; i++)

  5287.             av_log(avctx, AV_LOG_DEBUG, " %d.%.3d",

  5288.                    sd->coefs[sprite][i] / (1<<16),

  5289.                    (abs(sd->coefs[sprite][i]) & 0xFFFF) * 1000 / (1 << 16));

  5290.         av_log(avctx, AV_LOG_DEBUG, "\n");

  5291.     }

  5292. 

  5293.     skip_bits(gb, 2);

  5294.     if (sd->effect_type = get_bits_long(gb, 30)) {

  5295.         switch (sd->effect_pcount1 = get_bits(gb, 4)) {

  5296.         case 7:

  5297.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  5298.             break;

  5299.         case 14:

  5300.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  5301.             vc1_sprite_parse_transform(gb, sd->effect_params1 + 7);

  5302.             break;

  5303.         default:

  5304.             for (i = 0; i < sd->effect_pcount1; i++)

  5305.                 sd->effect_params1[i] = get_fp_val(gb);

  5306.         }

  5307.         if (sd->effect_type != 13 || sd->effect_params1[0] != sd->coefs[0][6]) {

  5308.             // effect 13 is simple alpha blending and matches the opacity above

  5309.             av_log(avctx, AV_LOG_DEBUG, "Effect: %d; params: ", sd->effect_type);

  5310.             for (i = 0; i < sd->effect_pcount1; i++)

  5311.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  5312.                        sd->effect_params1[i] / (1 << 16),

  5313.                        (abs(sd->effect_params1[i]) & 0xFFFF) * 1000 / (1 << 16));

  5314.             av_log(avctx, AV_LOG_DEBUG, "\n");

  5315.         }

  5316. 

  5317.         sd->effect_pcount2 = get_bits(gb, 16);

  5318.         if (sd->effect_pcount2 > 10) {

  5319.             av_log(avctx, AV_LOG_ERROR, "Too many effect parameters\n");

  5320.             return;

  5321.         } else if (sd->effect_pcount2) {

  5322.             i = -1;

  5323.             av_log(avctx, AV_LOG_DEBUG, "Effect params 2: ");

  5324.             while (++i < sd->effect_pcount2) {

  5325.                 sd->effect_params2[i] = get_fp_val(gb);

  5326.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  5327.                        sd->effect_params2[i] / (1 << 16),

  5328.                        (abs(sd->effect_params2[i]) & 0xFFFF) * 1000 / (1 << 16));

  5329.             }

  5330.             av_log(avctx, AV_LOG_DEBUG, "\n");

  5331.         }

  5332.     }

  5333.     if (sd->effect_flag = get_bits1(gb))

  5334.         av_log(avctx, AV_LOG_DEBUG, "Effect flag set\n");

  5335. 

  5336.     if (get_bits_count(gb) >= gb->size_in_bits +

  5337.        (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE ? 64 : 0))

  5338.         av_log(avctx, AV_LOG_ERROR, "Buffer overrun\n");

  5339.     if (get_bits_count(gb) < gb->size_in_bits - 8)

  5340.         av_log(avctx, AV_LOG_WARNING, "Buffer not fully read\n");

  5341. }

  5342. 

  5343. static void vc1_draw_sprites(VC1Context *v, SpriteData* sd)

  5344. {

  5345.     int i, plane, row, sprite;

  5346.     int sr_cache[2][2] = { { -1, -1 }, { -1, -1 } };

  5347.     uint8_t* src_h[2][2];

  5348.     int xoff[2], xadv[2], yoff[2], yadv[2], alpha;

  5349.     int ysub[2];

  5350.     MpegEncContext *s = &v->s;

  5351. 

  5352.     for (i = 0; i < 2; i++) {

  5353.         xoff[i] = av_clip(sd->coefs[i][2], 0, v->sprite_width-1 << 16);

  5354.         xadv[i] = sd->coefs[i][0];

  5355.         if (xadv[i] != 1<<16 || (v->sprite_width << 16) - (v->output_width << 16) - xoff[i])

  5356.             xadv[i] = av_clip(xadv[i], 0, ((v->sprite_width<<16) - xoff[i] - 1) / v->output_width);

  5357. 

  5358.         yoff[i] = av_clip(sd->coefs[i][5], 0, v->sprite_height-1 << 16);

  5359.         yadv[i] = av_clip(sd->coefs[i][4], 0, ((v->sprite_height << 16) - yoff[i]) / v->output_height);

  5360.     }

  5361.     alpha = av_clip(sd->coefs[1][6], 0, (1<<16) - 1);

  5362. 

  5363.     for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++) {

  5364.         int width = v->output_width>>!!plane;

  5365. 

  5366.         for (row = 0; row < v->output_height>>!!plane; row++) {

  5367.             uint8_t *dst = v->sprite_output_frame->data[plane] +

  5368.                            v->sprite_output_frame->linesize[plane] * row;

  5369. 

  5370.             for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  5371.                 uint8_t *iplane = s->current_picture.f.data[plane];

  5372.                 int      iline  = s->current_picture.f.linesize[plane];

  5373.                 int      ycoord = yoff[sprite] + yadv[sprite] * row;

  5374.                 int      yline  = ycoord >> 16;

  5375.                 int      next_line;

  5376.                 ysub[sprite] = ycoord & 0xFFFF;

  5377.                 if (sprite) {

  5378.                     iplane = s->last_picture.f.data[plane];

  5379.                     iline  = s->last_picture.f.linesize[plane];

  5380.                 }

  5381.                 next_line = FFMIN(yline + 1, (v->sprite_height >> !!plane) - 1) * iline;

  5382.                 if (!(xoff[sprite] & 0xFFFF) && xadv[sprite] == 1 << 16) {

  5383.                         src_h[sprite][0] = iplane + (xoff[sprite] >> 16) +  yline      * iline;

  5384.                     if (ysub[sprite])

  5385.                         src_h[sprite][1] = iplane + (xoff[sprite] >> 16) + next_line;

  5386.                 } else {

  5387.                     if (sr_cache[sprite][0] != yline) {

  5388.                         if (sr_cache[sprite][1] == yline) {

  5389.                             FFSWAP(uint8_t*, v->sr_rows[sprite][0], v->sr_rows[sprite][1]);

  5390.                             FFSWAP(int,        sr_cache[sprite][0],   sr_cache[sprite][1]);

  5391.                         } else {

  5392.                             v->vc1dsp.sprite_h(v->sr_rows[sprite][0], iplane + yline * iline, xoff[sprite], xadv[sprite], width);

  5393.                             sr_cache[sprite][0] = yline;

  5394.                         }

  5395.                     }

  5396.                     if (ysub[sprite] && sr_cache[sprite][1] != yline + 1) {

  5397.                         v->vc1dsp.sprite_h(v->sr_rows[sprite][1],

  5398.                                            iplane + next_line, xoff[sprite],

  5399.                                            xadv[sprite], width);

  5400.                         sr_cache[sprite][1] = yline + 1;

  5401.                     }

  5402.                     src_h[sprite][0] = v->sr_rows[sprite][0];

  5403.                     src_h[sprite][1] = v->sr_rows[sprite][1];

  5404.                 }

  5405.             }

  5406. 

  5407.             if (!v->two_sprites) {

  5408.                 if (ysub[0]) {

  5409.                     v->vc1dsp.sprite_v_single(dst, src_h[0][0], src_h[0][1], ysub[0], width);

  5410.                 } else {

  5411.                     memcpy(dst, src_h[0][0], width);

  5412.                 }

  5413.             } else {

  5414.                 if (ysub[0] && ysub[1]) {

  5415.                     v->vc1dsp.sprite_v_double_twoscale(dst, src_h[0][0], src_h[0][1], ysub[0],

  5416.                                                        src_h[1][0], src_h[1][1], ysub[1], alpha, width);

  5417.                 } else if (ysub[0]) {

  5418.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[0][0], src_h[0][1], ysub[0],

  5419.                                                        src_h[1][0], alpha, width);

  5420.                 } else if (ysub[1]) {

  5421.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[1][0], src_h[1][1], ysub[1],

  5422.                                                        src_h[0][0], (1<<16)-1-alpha, width);

  5423.                 } else {

  5424.                     v->vc1dsp.sprite_v_double_noscale(dst, src_h[0][0], src_h[1][0], alpha, width);

  5425.                 }

  5426.             }

  5427.         }

  5428. 

  5429.         if (!plane) {

  5430.             for (i = 0; i < 2; i++) {

  5431.                 xoff[i] >>= 1;

  5432.                 yoff[i] >>= 1;

  5433.             }

  5434.         }

  5435. 

  5436.     }

  5437. }

  5438. 

  5439. 

  5440. static int vc1_decode_sprites(VC1Context *v, GetBitContext* gb)

  5441. {

  5442.     MpegEncContext *s     = &v->s;

  5443.     AVCodecContext *avctx = s->avctx;

  5444.     SpriteData sd;

  5445. 

  5446.     vc1_parse_sprites(v, gb, &sd);

  5447. 

  5448.     if (!s->current_picture.f.data[0]) {

  5449.         av_log(avctx, AV_LOG_ERROR, "Got no sprites\n");

  5450.         return -1;

  5451.     }

  5452. 

  5453.     if (v->two_sprites && (!s->last_picture_ptr || !s->last_picture.f.data[0])) {

  5454.         av_log(avctx, AV_LOG_WARNING, "Need two sprites, only got one\n");

  5455.         v->two_sprites = 0;

  5456.     }

  5457. 

  5458.     av_frame_unref(v->sprite_output_frame);

  5459.     if (ff_get_buffer(avctx, v->sprite_output_frame, 0) < 0) {

  5460.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  5461.         return -1;

  5462.     }

  5463. 

  5464.     vc1_draw_sprites(v, &sd);

  5465. 

  5466.     return 0;

  5467. }

  5468. 

  5469. static void vc1_sprite_flush(AVCodecContext *avctx)

  5470. {

  5471.     VC1Context *v     = avctx->priv_data;

  5472.     MpegEncContext *s = &v->s;

  5473.     AVFrame *f = &s->current_picture.f;

  5474.     int plane, i;

  5475. 

  5476.     /* Windows Media Image codecs have a convergence interval of two keyframes.

  5477.        Since we can't enforce it, clear to black the missing sprite. This is

  5478.        wrong but it looks better than doing nothing. */

  5479. 

  5480.     if (f->data[0])

  5481.         for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++)

  5482.             for (i = 0; i < v->sprite_height>>!!plane; i++)

  5483.                 memset(f->data[plane] + i * f->linesize[plane],

  5484.                        plane ? 128 : 0, f->linesize[plane]);

  5485. }

  5486. 

  5487. #endif

  5488. 

  5489. av_cold int ff_vc1_decode_init_alloc_tables(VC1Context *v)

  5490. {

  5491.     MpegEncContext *s = &v->s;

  5492.     int i;

  5493.     int mb_height = FFALIGN(s->mb_height, 2);

  5494. 

  5495.     /* Allocate mb bitplanes */

  5496.     v->mv_type_mb_plane = av_malloc (s->mb_stride * mb_height);

  5497.     v->direct_mb_plane  = av_malloc (s->mb_stride * mb_height);

  5498.     v->forward_mb_plane = av_malloc (s->mb_stride * mb_height);

  5499.     v->fieldtx_plane    = av_mallocz(s->mb_stride * mb_height);

  5500.     v->acpred_plane     = av_malloc (s->mb_stride * mb_height);

  5501.     v->over_flags_plane = av_malloc (s->mb_stride * mb_height);

  5502. 

  5503.     v->n_allocated_blks = s->mb_width + 2;

  5504.     v->block            = av_malloc(sizeof(*v->block) * v->n_allocated_blks);

  5505.     v->cbp_base         = av_malloc(sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  5506.     v->cbp              = v->cbp_base + s->mb_stride;

  5507.     v->ttblk_base       = av_malloc(sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  5508.     v->ttblk            = v->ttblk_base + s->mb_stride;

  5509.     v->is_intra_base    = av_mallocz(sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  5510.     v->is_intra         = v->is_intra_base + s->mb_stride;

  5511.     v->luma_mv_base     = av_malloc(sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);

  5512.     v->luma_mv          = v->luma_mv_base + s->mb_stride;

  5513. 

  5514.     /* allocate block type info in that way so it could be used with s->block_index[] */

  5515.     v->mb_type_base = av_malloc(s->b8_stride * (mb_height * 2 + 1) + s->mb_stride * (mb_height + 1) * 2);

  5516.     v->mb_type[0]   = v->mb_type_base + s->b8_stride + 1;

  5517.     v->mb_type[1]   = v->mb_type_base + s->b8_stride * (mb_height * 2 + 1) + s->mb_stride + 1;

  5518.     v->mb_type[2]   = v->mb_type[1] + s->mb_stride * (mb_height + 1);

  5519. 

  5520.     /* allocate memory to store block level MV info */

  5521.     v->blk_mv_type_base = av_mallocz(     s->b8_stride * (mb_height * 2 + 1) + s->mb_stride * (mb_height + 1) * 2);

  5522.     v->blk_mv_type      = v->blk_mv_type_base + s->b8_stride + 1;

  5523.     v->mv_f_base        = av_mallocz(2 * (s->b8_stride * (mb_height * 2 + 1) + s->mb_stride * (mb_height + 1) * 2));

  5524.     v->mv_f[0]          = v->mv_f_base + s->b8_stride + 1;

  5525.     v->mv_f[1]          = v->mv_f[0] + (s->b8_stride * (mb_height * 2 + 1) + s->mb_stride * (mb_height + 1) * 2);

  5526.     v->mv_f_next_base   = av_mallocz(2 * (s->b8_stride * (mb_height * 2 + 1) + s->mb_stride * (mb_height + 1) * 2));

  5527.     v->mv_f_next[0]     = v->mv_f_next_base + s->b8_stride + 1;

  5528.     v->mv_f_next[1]     = v->mv_f_next[0] + (s->b8_stride * (mb_height * 2 + 1) + s->mb_stride * (mb_height + 1) * 2);

  5529. 

  5530.     /* Init coded blocks info */

  5531.     if (v->profile == PROFILE_ADVANCED) {

  5532. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  5533. //            return -1;

  5534. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  5535. //            return -1;

  5536.     }

  5537. 

  5538.     ff_intrax8_common_init(&v->x8,s);

  5539. 

  5540.     if (s->avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || s->avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5541.         for (i = 0; i < 4; i++)

  5542.             if (!(v->sr_rows[i >> 1][i & 1] = av_malloc(v->output_width))) return -1;

  5543.     }

  5544. 

  5545.     if (!v->mv_type_mb_plane || !v->direct_mb_plane || !v->acpred_plane || !v->over_flags_plane ||

  5546.         !v->block || !v->cbp_base || !v->ttblk_base || !v->is_intra_base || !v->luma_mv_base ||

  5547.         !v->mb_type_base) {

  5548.         av_freep(&v->mv_type_mb_plane);

  5549.         av_freep(&v->direct_mb_plane);

  5550.         av_freep(&v->acpred_plane);

  5551.         av_freep(&v->over_flags_plane);

  5552.         av_freep(&v->block);

  5553.         av_freep(&v->cbp_base);

  5554.         av_freep(&v->ttblk_base);

  5555.         av_freep(&v->is_intra_base);

  5556.         av_freep(&v->luma_mv_base);

  5557.         av_freep(&v->mb_type_base);

  5558.         return AVERROR(ENOMEM);

  5559.     }

  5560. 

  5561.     return 0;

  5562. }

  5563. 

  5564. av_cold void ff_vc1_init_transposed_scantables(VC1Context *v)

  5565. {

  5566.     int i;

  5567.     for (i = 0; i < 64; i++) {

  5568. #define transpose(x) ((x >> 3) | ((x & 7) << 3))

  5569.         v->zz_8x8[0][i] = transpose(ff_wmv1_scantable[0][i]);

  5570.         v->zz_8x8[1][i] = transpose(ff_wmv1_scantable[1][i]);

  5571.         v->zz_8x8[2][i] = transpose(ff_wmv1_scantable[2][i]);

  5572.         v->zz_8x8[3][i] = transpose(ff_wmv1_scantable[3][i]);

  5573.         v->zzi_8x8[i]   = transpose(ff_vc1_adv_interlaced_8x8_zz[i]);

  5574.     }

  5575.     v->left_blk_sh = 0;

  5576.     v->top_blk_sh  = 3;

  5577. }

  5578. 

  5579. /** Initialize a VC1/WMV3 decoder

  5580.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5581.  * @todo TODO: Decypher remaining bits in extra_data

  5582.  */

  5583. static av_cold int vc1_decode_init(AVCodecContext *avctx)

  5584. {

  5585.     VC1Context *v = avctx->priv_data;

  5586.     MpegEncContext *s = &v->s;

  5587.     GetBitContext gb;

  5588. 

  5589.     /* save the container output size for WMImage */

  5590.     v->output_width  = avctx->width;

  5591.     v->output_height = avctx->height;

  5592. 

  5593.     if (!avctx->extradata_size || !avctx->extradata)

  5594.         return -1;

  5595.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  5596.         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);

  5597.     else

  5598.         avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  5599.     avctx->hwaccel = ff_find_hwaccel(avctx);

  5600.     v->s.avctx = avctx;

  5601. 

  5602.     if (ff_vc1_init_common(v) < 0)

  5603.         return -1;

  5604.     ff_h264chroma_init(&v->h264chroma, 8);

  5605.     ff_vc1dsp_init(&v->vc1dsp);

  5606. 

  5607.     if (avctx->codec_id == AV_CODEC_ID_WMV3 || avctx->codec_id == AV_CODEC_ID_WMV3IMAGE) {

  5608.         int count = 0;

  5609. 

  5610.         // looks like WMV3 has a sequence header stored in the extradata

  5611.         // advanced sequence header may be before the first frame

  5612.         // the last byte of the extradata is a version number, 1 for the

  5613.         // samples we can decode

  5614. 

  5615.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  5616. 

  5617.         if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0)

  5618.           return -1;

  5619. 

  5620.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  5621.         if (count > 0) {

  5622.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  5623.                    count, get_bits(&gb, count));

  5624.         } else if (count < 0) {

  5625.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  5626.         }

  5627.     } else { // VC1/WVC1/WVP2

  5628.         const uint8_t *start = avctx->extradata;

  5629.         uint8_t *end = avctx->extradata + avctx->extradata_size;

  5630.         const uint8_t *next;

  5631.         int size, buf2_size;

  5632.         uint8_t *buf2 = NULL;

  5633.         int seq_initialized = 0, ep_initialized = 0;

  5634. 

  5635.         if (avctx->extradata_size < 16) {

  5636.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  5637.             return -1;

  5638.         }

  5639. 

  5640.         buf2  = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5641.         start = find_next_marker(start, end); // in WVC1 extradata first byte is its size, but can be 0 in mkv

  5642.         next  = start;

  5643.         for (; next < end; start = next) {

  5644.             next = find_next_marker(start + 4, end);

  5645.             size = next - start - 4;

  5646.             if (size <= 0)

  5647.                 continue;

  5648.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  5649.             init_get_bits(&gb, buf2, buf2_size * 8);

  5650.             switch (AV_RB32(start)) {

  5651.             case VC1_CODE_SEQHDR:

  5652.                 if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0) {

  5653.                     av_free(buf2);

  5654.                     return -1;

  5655.                 }

  5656.                 seq_initialized = 1;

  5657.                 break;

  5658.             case VC1_CODE_ENTRYPOINT:

  5659.                 if (ff_vc1_decode_entry_point(avctx, v, &gb) < 0) {

  5660.                     av_free(buf2);

  5661.                     return -1;

  5662.                 }

  5663.                 ep_initialized = 1;

  5664.                 break;

  5665.             }

  5666.         }

  5667.         av_free(buf2);

  5668.         if (!seq_initialized || !ep_initialized) {

  5669.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  5670.             return -1;

  5671.         }

  5672.         v->res_sprite = (avctx->codec_id == AV_CODEC_ID_VC1IMAGE);

  5673.     }

  5674. 

  5675.     v->sprite_output_frame = av_frame_alloc();

  5676.     if (!v->sprite_output_frame)

  5677.         return AVERROR(ENOMEM);

  5678. 

  5679.     avctx->profile = v->profile;

  5680.     if (v->profile == PROFILE_ADVANCED)

  5681.         avctx->level = v->level;

  5682. 

  5683.     avctx->has_b_frames = !!avctx->max_b_frames;

  5684. 

  5685.     s->mb_width  = (avctx->coded_width  + 15) >> 4;

  5686.     s->mb_height = (avctx->coded_height + 15) >> 4;

  5687. 

  5688.     if (v->profile == PROFILE_ADVANCED || v->res_fasttx) {

  5689.         ff_vc1_init_transposed_scantables(v);

  5690.     } else {

  5691.         memcpy(v->zz_8x8, ff_wmv1_scantable, 4*64);

  5692.         v->left_blk_sh = 3;

  5693.         v->top_blk_sh  = 0;

  5694.     }

  5695. 

  5696.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5697.         v->sprite_width  = avctx->coded_width;

  5698.         v->sprite_height = avctx->coded_height;

  5699. 

  5700.         avctx->coded_width  = avctx->width  = v->output_width;

  5701.         avctx->coded_height = avctx->height = v->output_height;

  5702. 

  5703.         // prevent 16.16 overflows

  5704.         if (v->sprite_width  > 1 << 14 ||

  5705.             v->sprite_height > 1 << 14 ||

  5706.             v->output_width  > 1 << 14 ||

  5707.             v->output_height > 1 << 14) return -1;

  5708.     }

  5709.     return 0;

  5710. }

  5711. 

  5712. /** Close a VC1/WMV3 decoder

  5713.  * @warning Initial try at using MpegEncContext stuff

  5714.  */

  5715. av_cold int ff_vc1_decode_end(AVCodecContext *avctx)

  5716. {

  5717.     VC1Context *v = avctx->priv_data;

  5718.     int i;

  5719. 

  5720.     av_frame_free(&v->sprite_output_frame);

  5721. 

  5722.     for (i = 0; i < 4; i++)

  5723.         av_freep(&v->sr_rows[i >> 1][i & 1]);

  5724.     av_freep(&v->hrd_rate);

  5725.     av_freep(&v->hrd_buffer);

  5726.     ff_MPV_common_end(&v->s);

  5727.     av_freep(&v->mv_type_mb_plane);

  5728.     av_freep(&v->direct_mb_plane);

  5729.     av_freep(&v->forward_mb_plane);

  5730.     av_freep(&v->fieldtx_plane);

  5731.     av_freep(&v->acpred_plane);

  5732.     av_freep(&v->over_flags_plane);

  5733.     av_freep(&v->mb_type_base);

  5734.     av_freep(&v->blk_mv_type_base);

  5735.     av_freep(&v->mv_f_base);

  5736.     av_freep(&v->mv_f_next_base);

  5737.     av_freep(&v->block);

  5738.     av_freep(&v->cbp_base);

  5739.     av_freep(&v->ttblk_base);

  5740.     av_freep(&v->is_intra_base); // FIXME use v->mb_type[]

  5741.     av_freep(&v->luma_mv_base);

  5742.     ff_intrax8_common_end(&v->x8);

  5743.     return 0;

  5744. }

  5745. 

  5746. 

  5747. /** Decode a VC1/WMV3 frame

  5748.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5749.  */

  5750. static int vc1_decode_frame(AVCodecContext *avctx, void *data,

  5751.                             int *got_frame, AVPacket *avpkt)

  5752. {

  5753.     const uint8_t *buf = avpkt->data;

  5754.     int buf_size = avpkt->size, n_slices = 0, i, ret;

  5755.     VC1Context *v = avctx->priv_data;

  5756.     MpegEncContext *s = &v->s;

  5757.     AVFrame *pict = data;

  5758.     uint8_t *buf2 = NULL;

  5759.     const uint8_t *buf_start = buf;

  5760.     int mb_height, n_slices1;

  5761.     struct {

  5762.         uint8_t *buf;

  5763.         GetBitContext gb;

  5764.         int mby_start;

  5765.     } *slices = NULL, *tmp;

  5766. 

  5767.     /* no supplementary picture */

  5768.     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == VC1_CODE_ENDOFSEQ)) {

  5769.         /* special case for last picture */

  5770.         if (s->low_delay == 0 && s->next_picture_ptr) {

  5771.             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)

  5772.                 return ret;

  5773.             s->next_picture_ptr = NULL;

  5774. 

  5775.             *got_frame = 1;

  5776.         }

  5777. 

  5778.         return 0;

  5779.     }

  5780. 

  5781.     //for advanced profile we may need to parse and unescape data

  5782.     if (avctx->codec_id == AV_CODEC_ID_VC1 || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5783.         int buf_size2 = 0;

  5784.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5785. 

  5786.         if (IS_MARKER(AV_RB32(buf))) { /* frame starts with marker and needs to be parsed */

  5787.             const uint8_t *start, *end, *next;

  5788.             int size;

  5789. 

  5790.             next = buf;

  5791.             for (start = buf, end = buf + buf_size; next < end; start = next) {

  5792.                 next = find_next_marker(start + 4, end);

  5793.                 size = next - start - 4;

  5794.                 if (size <= 0) continue;

  5795.                 switch (AV_RB32(start)) {

  5796.                 case VC1_CODE_FRAME:

  5797.                     if (avctx->hwaccel)

  5798.                         buf_start = start;

  5799.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5800.                     break;

  5801.                 case VC1_CODE_FIELD: {

  5802.                     int buf_size3;

  5803.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5804.                     if (!tmp)

  5805.                         goto err;

  5806.                     slices = tmp;

  5807.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5808.                     if (!slices[n_slices].buf)

  5809.                         goto err;

  5810.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5811.                                                     slices[n_slices].buf);

  5812.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5813.                                   buf_size3 << 3);

  5814.                     /* assuming that the field marker is at the exact middle,

  5815.                        hope it's correct */

  5816.                     slices[n_slices].mby_start = s->mb_height >> 1;

  5817.                     n_slices1 = n_slices - 1; // index of the last slice of the first field

  5818.                     n_slices++;

  5819.                     break;

  5820.                 }

  5821.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  5822.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5823.                     init_get_bits(&s->gb, buf2, buf_size2 * 8);

  5824.                     ff_vc1_decode_entry_point(avctx, v, &s->gb);

  5825.                     break;

  5826.                 case VC1_CODE_SLICE: {

  5827.                     int buf_size3;

  5828.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5829.                     if (!tmp)

  5830.                         goto err;

  5831.                     slices = tmp;

  5832.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5833.                     if (!slices[n_slices].buf)

  5834.                         goto err;

  5835.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5836.                                                     slices[n_slices].buf);

  5837.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5838.                                   buf_size3 << 3);

  5839.                     slices[n_slices].mby_start = get_bits(&slices[n_slices].gb, 9);

  5840.                     n_slices++;

  5841.                     break;

  5842.                 }

  5843.                 }

  5844.             }

  5845.         } else if (v->interlace && ((buf[0] & 0xC0) == 0xC0)) { /* WVC1 interlaced stores both fields divided by marker */

  5846.             const uint8_t *divider;

  5847.             int buf_size3;

  5848. 

  5849.             divider = find_next_marker(buf, buf + buf_size);

  5850.             if ((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD) {

  5851.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  5852.                 goto err;

  5853.             } else { // found field marker, unescape second field

  5854.                 tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5855.                 if (!tmp)

  5856.                     goto err;

  5857.                 slices = tmp;

  5858.                 slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5859.                 if (!slices[n_slices].buf)

  5860.                     goto err;

  5861.                 buf_size3 = vc1_unescape_buffer(divider + 4, buf + buf_size - divider - 4, slices[n_slices].buf);

  5862.                 init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5863.                               buf_size3 << 3);

  5864.                 slices[n_slices].mby_start = s->mb_height >> 1;

  5865.                 n_slices1 = n_slices - 1;

  5866.                 n_slices++;

  5867.             }

  5868.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  5869.         } else {

  5870.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  5871.         }

  5872.         init_get_bits(&s->gb, buf2, buf_size2*8);

  5873.     } else

  5874.         init_get_bits(&s->gb, buf, buf_size*8);

  5875. 

  5876.     if (v->res_sprite) {

  5877.         v->new_sprite  = !get_bits1(&s->gb);

  5878.         v->two_sprites =  get_bits1(&s->gb);

  5879.         /* res_sprite means a Windows Media Image stream, AV_CODEC_ID_*IMAGE means

  5880.            we're using the sprite compositor. These are intentionally kept separate

  5881.            so you can get the raw sprites by using the wmv3 decoder for WMVP or

  5882.            the vc1 one for WVP2 */

  5883.         if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5884.             if (v->new_sprite) {

  5885.                 // switch AVCodecContext parameters to those of the sprites

  5886.                 avctx->width  = avctx->coded_width  = v->sprite_width;

  5887.                 avctx->height = avctx->coded_height = v->sprite_height;

  5888.             } else {

  5889.                 goto image;

  5890.             }

  5891.         }

  5892.     }

  5893. 

  5894.     if (s->context_initialized &&

  5895.         (s->width  != avctx->coded_width ||

  5896.          s->height != avctx->coded_height)) {

  5897.         ff_vc1_decode_end(avctx);

  5898.     }

  5899. 

  5900.     if (!s->context_initialized) {

  5901.         if (ff_msmpeg4_decode_init(avctx) < 0)

  5902.             goto err;

  5903.         if (ff_vc1_decode_init_alloc_tables(v) < 0) {

  5904.             ff_MPV_common_end(s);

  5905.             goto err;

  5906.         }

  5907. 

  5908.         s->low_delay = !avctx->has_b_frames || v->res_sprite;

  5909. 

  5910.         if (v->profile == PROFILE_ADVANCED) {

  5911.             s->h_edge_pos = avctx->coded_width;

  5912.             s->v_edge_pos = avctx->coded_height;

  5913.         }

  5914.     }

  5915. 

  5916.     // do parse frame header

  5917.     v->pic_header_flag = 0;

  5918.     v->first_pic_header_flag = 1;

  5919.     if (v->profile < PROFILE_ADVANCED) {

  5920.         if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {

  5921.             goto err;

  5922.         }

  5923.     } else {

  5924.         if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5925.             goto err;

  5926.         }

  5927.     }

  5928.     v->first_pic_header_flag = 0;

  5929. 

  5930.     if ((avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE)

  5931.         && s->pict_type != AV_PICTURE_TYPE_I) {

  5932.         av_log(v->s.avctx, AV_LOG_ERROR, "Sprite decoder: expected I-frame\n");

  5933.         goto err;

  5934.     }

  5935. 

  5936.     // for skipping the frame

  5937.     s->current_picture.f.pict_type = s->pict_type;

  5938.     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;

  5939. 

  5940.     /* skip B-frames if we don't have reference frames */

  5941.     if (s->last_picture_ptr == NULL && (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) {

  5942.         goto err;

  5943.     }

  5944.     if ((avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B) ||

  5945.         (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I) ||

  5946.          avctx->skip_frame >= AVDISCARD_ALL) {

  5947.         goto end;

  5948.     }

  5949. 

  5950.     if (s->next_p_frame_damaged) {

  5951.         if (s->pict_type == AV_PICTURE_TYPE_B)

  5952.             goto end;

  5953.         else

  5954.             s->next_p_frame_damaged = 0;

  5955.     }

  5956. 

  5957.     if (ff_MPV_frame_start(s, avctx) < 0) {

  5958.         goto err;

  5959.     }

  5960. 

  5961.     // process pulldown flags

  5962.     s->current_picture_ptr->f.repeat_pict = 0;

  5963.     // Pulldown flags are only valid when 'broadcast' has been set.

  5964.     // So ticks_per_frame will be 2

  5965.     if (v->rff) {

  5966.         // repeat field

  5967.         s->current_picture_ptr->f.repeat_pict = 1;

  5968.     } else if (v->rptfrm) {

  5969.         // repeat frames

  5970.         s->current_picture_ptr->f.repeat_pict = v->rptfrm * 2;

  5971.     }

  5972. 

  5973.     s->me.qpel_put = s->dsp.put_qpel_pixels_tab;

  5974.     s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;

  5975. 

  5976.     if (avctx->hwaccel) {

  5977.         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)

  5978.             goto err;

  5979.         if (avctx->hwaccel->decode_slice(avctx, buf_start, (buf + buf_size) - buf_start) < 0)

  5980.             goto err;

  5981.         if (avctx->hwaccel->end_frame(avctx) < 0)

  5982.             goto err;

  5983.     } else {

  5984.         int header_ret = 0;

  5985. 

  5986.         ff_mpeg_er_frame_start(s);

  5987. 

  5988.         v->bits = buf_size * 8;

  5989.         v->end_mb_x = s->mb_width;

  5990.         if (v->field_mode) {

  5991.             s->current_picture.f.linesize[0] <<= 1;

  5992.             s->current_picture.f.linesize[1] <<= 1;

  5993.             s->current_picture.f.linesize[2] <<= 1;

  5994.             s->linesize                      <<= 1;

  5995.             s->uvlinesize                    <<= 1;

  5996.         }

  5997.         mb_height = s->mb_height >> v->field_mode;

  5998. 

  5999.         if (!mb_height) {

  6000.             av_log(v->s.avctx, AV_LOG_ERROR, "Invalid mb_height.\n");

  6001.             goto err;

  6002.         }

  6003. 

  6004.         for (i = 0; i <= n_slices; i++) {

  6005.             if (i > 0 &&  slices[i - 1].mby_start >= mb_height) {

  6006.                 if (v->field_mode <= 0) {

  6007.                     av_log(v->s.avctx, AV_LOG_ERROR, "Slice %d starts beyond "

  6008.                            "picture boundary (%d >= %d)\n", i,

  6009.                            slices[i - 1].mby_start, mb_height);

  6010.                     continue;

  6011.                 }

  6012.                 v->second_field = 1;

  6013.                 v->blocks_off   = s->mb_width  * s->mb_height << 1;

  6014.                 v->mb_off       = s->mb_stride * s->mb_height >> 1;

  6015.             } else {

  6016.                 v->second_field = 0;

  6017.                 v->blocks_off   = 0;

  6018.                 v->mb_off       = 0;

  6019.             }

  6020.             if (i) {

  6021.                 v->pic_header_flag = 0;

  6022.                 if (v->field_mode && i == n_slices1 + 2) {

  6023.                     if ((header_ret = ff_vc1_parse_frame_header_adv(v, &s->gb)) < 0) {

  6024.                         av_log(v->s.avctx, AV_LOG_ERROR, "Field header damaged\n");

  6025.                         if (avctx->err_recognition & AV_EF_EXPLODE)

  6026.                             goto err;

  6027.                         continue;

  6028.                     }

  6029.                 } else if (get_bits1(&s->gb)) {

  6030.                     v->pic_header_flag = 1;

  6031.                     if ((header_ret = ff_vc1_parse_frame_header_adv(v, &s->gb)) < 0) {

  6032.                         av_log(v->s.avctx, AV_LOG_ERROR, "Slice header damaged\n");

  6033.                         if (avctx->err_recognition & AV_EF_EXPLODE)

  6034.                             goto err;

  6035.                         continue;

  6036.                     }

  6037.                 }

  6038.             }

  6039.             if (header_ret < 0)

  6040.                 continue;

  6041.             s->start_mb_y = (i == 0) ? 0 : FFMAX(0, slices[i-1].mby_start % mb_height);

  6042.             if (!v->field_mode || v->second_field)

  6043.                 s->end_mb_y = (i == n_slices     ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  6044.             else

  6045.                 s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  6046.             ff_vc1_decode_blocks(v);

  6047.             if (i != n_slices)

  6048.                 s->gb = slices[i].gb;

  6049.         }

  6050.         if (v->field_mode) {

  6051.             v->second_field = 0;

  6052.             s->current_picture.f.linesize[0] >>= 1;

  6053.             s->current_picture.f.linesize[1] >>= 1;

  6054.             s->current_picture.f.linesize[2] >>= 1;

  6055.             s->linesize                      >>= 1;

  6056.             s->uvlinesize                    >>= 1;

  6057.             if (v->s.pict_type != AV_PICTURE_TYPE_BI && v->s.pict_type != AV_PICTURE_TYPE_B) {

  6058.                 FFSWAP(uint8_t *, v->mv_f_next[0], v->mv_f[0]);

  6059.                 FFSWAP(uint8_t *, v->mv_f_next[1], v->mv_f[1]);

  6060.             }

  6061.         }

  6062.         av_dlog(s->avctx, "Consumed %i/%i bits\n",

  6063.                 get_bits_count(&s->gb), s->gb.size_in_bits);

  6064. //  if (get_bits_count(&s->gb) > buf_size * 8)

  6065. //      return -1;

  6066.         if (!v->field_mode)

  6067.             ff_er_frame_end(&s->er);

  6068.     }

  6069. 

  6070.     ff_MPV_frame_end(s);

  6071. 

  6072.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  6073. image:

  6074.         avctx->width  = avctx->coded_width  = v->output_width;

  6075.         avctx->height = avctx->coded_height = v->output_height;

  6076.         if (avctx->skip_frame >= AVDISCARD_NONREF)

  6077.             goto end;

  6078. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  6079.         if (vc1_decode_sprites(v, &s->gb))

  6080.             goto err;

  6081. #endif

  6082.         if ((ret = av_frame_ref(pict, v->sprite_output_frame)) < 0)

  6083.             goto err;

  6084.         *got_frame = 1;

  6085.     } else {

  6086.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  6087.             if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)

  6088.                 goto err;

  6089.             ff_print_debug_info(s, s->current_picture_ptr);

  6090.             *got_frame = 1;

  6091.         } else if (s->last_picture_ptr != NULL) {

  6092.             if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)

  6093.                 goto err;

  6094.             ff_print_debug_info(s, s->last_picture_ptr);

  6095.             *got_frame = 1;

  6096.         }

  6097.     }

  6098. 

  6099. end:

  6100.     av_free(buf2);

  6101.     for (i = 0; i < n_slices; i++)

  6102.         av_free(slices[i].buf);

  6103.     av_free(slices);

  6104.     return buf_size;

  6105. 

  6106. err:

  6107.     av_free(buf2);

  6108.     for (i = 0; i < n_slices; i++)

  6109.         av_free(slices[i].buf);

  6110.     av_free(slices);

  6111.     return -1;

  6112. }

  6113. 

  6114. 

  6115. static const AVProfile profiles[] = {

  6116.     { FF_PROFILE_VC1_SIMPLE,   "Simple"   },

  6117.     { FF_PROFILE_VC1_MAIN,     "Main"     },

  6118.     { FF_PROFILE_VC1_COMPLEX,  "Complex"  },

  6119.     { FF_PROFILE_VC1_ADVANCED, "Advanced" },

  6120.     { FF_PROFILE_UNKNOWN },

  6121. };

  6122. 

  6123. static const enum AVPixelFormat vc1_hwaccel_pixfmt_list_420[] = {

  6124. #if CONFIG_DXVA2

  6125.     AV_PIX_FMT_DXVA2_VLD,

  6126. #endif

  6127. #if CONFIG_VAAPI

  6128.     AV_PIX_FMT_VAAPI_VLD,

  6129. #endif

  6130. #if CONFIG_VDPAU

  6131.     AV_PIX_FMT_VDPAU,

  6132. #endif

  6133.     AV_PIX_FMT_YUV420P,

  6134.     AV_PIX_FMT_NONE

  6135. };

  6136. 

  6137. AVCodec ff_vc1_decoder = {

  6138.     .name           = "vc1",

  6139.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1"),

  6140.     .type           = AVMEDIA_TYPE_VIDEO,

  6141.     .id             = AV_CODEC_ID_VC1,

  6142.     .priv_data_size = sizeof(VC1Context),

  6143.     .init           = vc1_decode_init,

  6144.     .close          = ff_vc1_decode_end,

  6145.     .decode         = vc1_decode_frame,

  6146.     .flush          = ff_mpeg_flush,

  6147.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  6148.     .pix_fmts       = vc1_hwaccel_pixfmt_list_420,

  6149.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  6150. };

  6151. 

  6152. #if CONFIG_WMV3_DECODER

  6153. AVCodec ff_wmv3_decoder = {

  6154.     .name           = "wmv3",

  6155.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9"),

  6156.     .type           = AVMEDIA_TYPE_VIDEO,

  6157.     .id             = AV_CODEC_ID_WMV3,

  6158.     .priv_data_size = sizeof(VC1Context),

  6159.     .init           = vc1_decode_init,

  6160.     .close          = ff_vc1_decode_end,

  6161.     .decode         = vc1_decode_frame,

  6162.     .flush          = ff_mpeg_flush,

  6163.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  6164.     .pix_fmts       = vc1_hwaccel_pixfmt_list_420,

  6165.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  6166. };

  6167. #endif

  6168. 

  6169. #if CONFIG_WMV3IMAGE_DECODER

  6170. AVCodec ff_wmv3image_decoder = {

  6171.     .name           = "wmv3image",

  6172.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image"),

  6173.     .type           = AVMEDIA_TYPE_VIDEO,

  6174.     .id             = AV_CODEC_ID_WMV3IMAGE,

  6175.     .priv_data_size = sizeof(VC1Context),

  6176.     .init           = vc1_decode_init,

  6177.     .close          = ff_vc1_decode_end,

  6178.     .decode         = vc1_decode_frame,

  6179.     .capabilities   = CODEC_CAP_DR1,

  6180.     .flush          = vc1_sprite_flush,

  6181.     .pix_fmts       = ff_pixfmt_list_420

  6182. };

  6183. #endif

  6184. 

  6185. #if CONFIG_VC1IMAGE_DECODER

  6186. AVCodec ff_vc1image_decoder = {

  6187.     .name           = "vc1image",

  6188.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image v2"),

  6189.     .type           = AVMEDIA_TYPE_VIDEO,

  6190.     .id             = AV_CODEC_ID_VC1IMAGE,

  6191.     .priv_data_size = sizeof(VC1Context),

  6192.     .init           = vc1_decode_init,

  6193.     .close          = ff_vc1_decode_end,

  6194.     .decode         = vc1_decode_frame,

  6195.     .capabilities   = CODEC_CAP_DR1,

  6196.     .flush          = vc1_sprite_flush,

  6197.     .pix_fmts       = ff_pixfmt_list_420

  6198. };

  6199. #endif