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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. #include "vdpau_internal.h"

  42. 

  43. #undef NDEBUG

  44. #include <assert.h>

  45. 

  46. #define MB_INTRA_VLC_BITS 9

  47. #define DC_VLC_BITS 9

  48. 

  49. 

  50. // offset tables for interlaced picture MVDATA decoding

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

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

  53. 

  54. /***********************************************************************/

  55. /**

  56.  * @name VC-1 Bitplane decoding

  57.  * @see 8.7, p56

  58.  * @{

  59.  */

  60. 

  61. /**

  62.  * Imode types

  63.  * @{

  64.  */

  65. enum Imode {

  66.     IMODE_RAW,

  67.     IMODE_NORM2,

  68.     IMODE_DIFF2,

  69.     IMODE_NORM6,

  70.     IMODE_DIFF6,

  71.     IMODE_ROWSKIP,

  72.     IMODE_COLSKIP

  73. };

  74. /** @} */ //imode defines

  75. 

  76. 

  77. /** @} */ //Bitplane group

  78. 

  79. static void vc1_put_signed_blocks_clamped(VC1Context *v)

  80. {

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

  82.     int topleft_mb_pos, top_mb_pos;

  83.     int stride_y, fieldtx;

  84.     int v_dist;

  85. 

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

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

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

  89.      * present as well.

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

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

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

  93.     if (!s->first_slice_line) {

  94.         if (s->mb_x) {

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

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

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

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

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

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

  101.                                              stride_y);

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

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

  104.                                              stride_y);

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

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

  107.                                              stride_y);

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

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

  110.                                              stride_y);

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

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

  113.                                              s->uvlinesize);

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

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

  116.                                              s->uvlinesize);

  117.         }

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

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

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

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

  122.             v_dist     = fieldtx ? 15 : 8;

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

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

  125.                                              stride_y);

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

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

  128.                                              stride_y);

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

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

  131.                                              stride_y);

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

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

  134.                                              stride_y);

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

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

  137.                                              s->uvlinesize);

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

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

  140.                                              s->uvlinesize);

  141.         }

  142.     }

  143. 

  144. #define inc_blk_idx(idx) do { \

  145.         idx++; \

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

  147.             idx = 0; \

  148.     } while (0)

  149. 

  150.     inc_blk_idx(v->topleft_blk_idx);

  151.     inc_blk_idx(v->top_blk_idx);

  152.     inc_blk_idx(v->left_blk_idx);

  153.     inc_blk_idx(v->cur_blk_idx);

  154. }

  155. 

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

  157. {

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

  159.     int j;

  160.     if (!s->first_slice_line) {

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

  162.         if (s->mb_x)

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

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

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

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

  167.             if (s->mb_x)

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

  169.         }

  170.     }

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

  172. 

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

  174.         if (s->mb_x) {

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

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

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

  178.         }

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

  180.     }

  181. }

  182. 

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

  184. {

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

  186.     int j;

  187. 

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

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

  190.     if (!s->first_slice_line) {

  191.         if (s->mb_x) {

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

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

  194. 

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

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

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

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

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

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

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

  202.                     }

  203.                 }

  204.             }

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

  206.         }

  207. 

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

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

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

  211. 

  212.                 if (s->mb_x)

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

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

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

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

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

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

  219.                     }

  220.                 }

  221.             }

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

  223.         }

  224. 

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

  226.             if (s->mb_x) {

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

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

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

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

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

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

  233.                     }

  234.                 }

  235.             }

  236. 

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

  238.                 if (s->mb_x)

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

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

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

  244.                     }

  245.                 }

  246.             }

  247.         }

  248.     }

  249. }

  250. 

  251. static void vc1_smooth_overlap_filter_iblk(VC1Context *v)

  252. {

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

  254.     int mb_pos;

  255. 

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

  257.         return;

  258. 

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

  260. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  280.             }

  281.         }

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

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

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

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

  286. 

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

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

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

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

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

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

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

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

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

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

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

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

  299.                 }

  300.             }

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

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

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

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

  305.         }

  306.     }

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

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

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

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

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

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

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

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

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

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

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

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

  319.             }

  320.         }

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

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

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

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

  325.     }

  326. }

  327. 

  328. /** Do motion compensation over 1 macroblock

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

  330.  */

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

  332. {

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

  334.     DSPContext *dsp   = &v->s.dsp;

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

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

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

  338.     int off, off_uv;

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

  340. 

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

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

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

  344.         return;

  345. 

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

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

  348. 

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

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

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

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

  353.     }

  354. 

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

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

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

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

  359. 

  360.     if (v->field_mode &&

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

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

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

  364.     }

  365. 

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

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

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

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

  370.     }

  371.     if (v->field_mode) { // interlaced field picture

  372.         if (!dir) {

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

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

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

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

  377.             } else {

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

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

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

  381.             }

  382.         } else {

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

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

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

  386.         }

  387.     } else {

  388.         if (!dir) {

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

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

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

  392.         } else {

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

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

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

  396.         }

  397.     }

  398. 

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

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

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

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

  403. 

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

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

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

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

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

  409.     } else {

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

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

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

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

  414.     }

  415. 

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

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

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

  419. 

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

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

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

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

  424.     }

  425. 

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

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

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

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

  430.     }

  431. 

  432.     if (v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

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

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

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

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

  437. 

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

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

  440.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

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

  442.                                  s->h_edge_pos, v_edge_pos);

  443.         srcY = s->edge_emu_buffer;

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

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

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

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

  448.         srcU = uvbuf;

  449.         srcV = uvbuf + 16;

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

  451.         if (v->rangeredfrm) {

  452.             int i, j;

  453.             uint8_t *src, *src2;

  454. 

  455.             src = srcY;

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

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

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

  459.                 src += s->linesize;

  460.             }

  461.             src  = srcU;

  462.             src2 = srcV;

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

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

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

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

  467.                 }

  468.                 src  += s->uvlinesize;

  469.                 src2 += s->uvlinesize;

  470.             }

  471.         }

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

  473.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  474.             int i, j;

  475.             uint8_t *src, *src2;

  476. 

  477.             src = srcY;

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

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

  480.                     src[i] = v->luty[src[i]];

  481.                 src += s->linesize;

  482.             }

  483.             src  = srcU;

  484.             src2 = srcV;

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

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

  487.                     src[i]  = v->lutuv[src[i]];

  488.                     src2[i] = v->lutuv[src2[i]];

  489.                 }

  490.                 src  += s->uvlinesize;

  491.                 src2 += s->uvlinesize;

  492.             }

  493.         }

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

  495.     }

  496. 

  497.     if (v->field_mode && v->cur_field_type) {

  498.         off    = s->current_picture_ptr->f.linesize[0];

  499.         off_uv = s->current_picture_ptr->f.linesize[1];

  500.     } else {

  501.         off    = 0;

  502.         off_uv = 0;

  503.     }

  504.     if (s->mspel) {

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

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

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

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

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

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

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

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

  513.         if (!v->rnd)

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

  515.         else

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

  517.     }

  518. 

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

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

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

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

  523.     if (!v->rnd) {

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

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

  526.     } else {

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

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

  529.     }

  530. }

  531. 

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

  533. {

  534.     if (a < b) {

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

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

  537.     } else {

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

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

  540.     }

  541. }

  542. 

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

  544.  */

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

  546. {

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

  548.     DSPContext *dsp = &v->s.dsp;

  549.     uint8_t *srcY;

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

  551.     int off;

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

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

  554. 

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

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

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

  558.         return;

  559. 

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

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

  562. 

  563.     if (!dir) {

  564.         if (v->field_mode) {

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

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

  567.             else

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

  569.         } else

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

  571.     } else

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

  573. 

  574.     if (v->field_mode) {

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

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

  577.     }

  578. 

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

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

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

  582.         int tx, ty;

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

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

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

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

  587.             opp_count  += f;

  588.             same_count += 1 - f;

  589.         }

  590.         f = opp_count > same_count;

  591.         switch (f ? opp_count : same_count) {

  592.         case 4:

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

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

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

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

  597.             break;

  598.         case 3:

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

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

  601.             break;

  602.         case 2:

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

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

  605.             break;

  606.         }

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

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

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

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

  611.     }

  612. 

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

  614.         int qx, qy;

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

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

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

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

  619. 

  620.         if (qx < -17)

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

  622.         else if (qx > width)

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

  624.         if (qy < -18)

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

  626.         else if (qy > height + 1)

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

  628.     }

  629. 

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

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

  632.     else

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

  634.     if (v->field_mode && v->cur_field_type)

  635.         off += s->current_picture_ptr->f.linesize[0];

  636. 

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

  638.     if (!fieldmv)

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

  640.     else

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

  642. 

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

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

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

  646.     } else {

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

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

  649.             if (src_y & 1)

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

  651.             else

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

  653.         } else {

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

  655.         }

  656.     }

  657. 

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

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

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

  661. 

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

  663.         v_edge_pos--;

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

  665.         src_y--;

  666.     if (v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

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

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

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

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

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

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

  673.                                  9 + s->mspel * 2, (9 + s->mspel * 2) << fieldmv,

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

  675.                                  s->h_edge_pos, v_edge_pos);

  676.         srcY = s->edge_emu_buffer;

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

  678.         if (v->rangeredfrm) {

  679.             int i, j;

  680.             uint8_t *src;

  681. 

  682.             src = srcY;

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

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

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

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

  687.             }

  688.         }

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

  690.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  691.             int i, j;

  692.             uint8_t *src;

  693. 

  694.             src = srcY;

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

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

  697.                     src[i] = v->luty[src[i]];

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

  699.             }

  700.         }

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

  702.     }

  703. 

  704.     if (s->mspel) {

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

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

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

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

  709.         if (!v->rnd)

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

  711.         else

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

  713.     }

  714. }

  715. 

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

  717. {

  718.     int idx, i;

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

  720. 

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

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

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

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

  725.     if (!idx) {

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

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

  728.         return 4;

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

  730.         switch (idx) {

  731.         case 0x1:

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

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

  734.             return 3;

  735.         case 0x2:

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

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

  738.             return 3;

  739.         case 0x4:

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

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

  742.             return 3;

  743.         case 0x8:

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

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

  746.             return 3;

  747.         }

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

  749.         int t1 = 0, t2 = 0;

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

  751.             if (!a[i]) {

  752.                 t1 = i;

  753.                 break;

  754.             }

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

  756.             if (!a[i]) {

  757.                 t2 = i;

  758.                 break;

  759.             }

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

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

  762.         return 2;

  763.     } else {

  764.         return 0;

  765.     }

  766.     return -1;

  767. }

  768. 

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

  770.  */

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

  772. {

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

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

  775.     uint8_t *srcU, *srcV;

  776.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

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

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

  779.     int valid_count;

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

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

  782. 

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

  784.         return;

  785.     if (s->flags & CODEC_FLAG_GRAY)

  786.         return;

  787. 

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

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

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

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

  792.         if (v->field_mode)

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

  794.     }

  795. 

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

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

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

  799.         chroma_ref_type = v->reffield;

  800.         if (!valid_count) {

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

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

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

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

  805.         }

  806.     } else {

  807.         int dominant = 0;

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

  809.             dominant = 1;

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

  811.         if (dominant)

  812.             chroma_ref_type = !v->cur_field_type;

  813.     }

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

  815.         return;

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

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

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

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

  820. 

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

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

  823. 

  824.     if (v->fastuvmc) {

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

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

  827.     }

  828.     // Field conversion bias

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

  830.         uvmy += 2 - 4 * chroma_ref_type;

  831. 

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

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

  834. 

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

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

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

  838.     } else {

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

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

  841.     }

  842. 

  843.     if (!dir) {

  844.         if (v->field_mode) {

  845.             if ((v->cur_field_type != chroma_ref_type) && v->cur_field_type) {

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

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

  848.             } else {

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

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

  851.             }

  852.         } else {

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

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

  855.         }

  856.     } else {

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

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

  859.     }

  860. 

  861.     if (v->field_mode) {

  862.         if (chroma_ref_type) {

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

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

  865.         }

  866.         off = v->cur_field_type ? s->current_picture_ptr->f.linesize[1] : 0;

  867.     }

  868. 

  869.     if (v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)

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

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

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

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

  874.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

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

  877.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

  879.         srcU = s->edge_emu_buffer;

  880.         srcV = s->edge_emu_buffer + 16;

  881. 

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

  883.         if (v->rangeredfrm) {

  884.             int i, j;

  885.             uint8_t *src, *src2;

  886. 

  887.             src  = srcU;

  888.             src2 = srcV;

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

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

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

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

  893.                 }

  894.                 src  += s->uvlinesize;

  895.                 src2 += s->uvlinesize;

  896.             }

  897.         }

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

  899.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  900.             int i, j;

  901.             uint8_t *src, *src2;

  902. 

  903.             src  = srcU;

  904.             src2 = srcV;

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

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

  907.                     src[i]  = v->lutuv[src[i]];

  908.                     src2[i] = v->lutuv[src2[i]];

  909.                 }

  910.                 src  += s->uvlinesize;

  911.                 src2 += s->uvlinesize;

  912.             }

  913.         }

  914.     }

  915. 

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

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

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

  919.     if (!v->rnd) {

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

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

  922.     } else {

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

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

  925.     }

  926. }

  927. 

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

  929.  */

  930. static void vc1_mc_4mv_chroma4(VC1Context *v)

  931. {

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

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

  934.     uint8_t *srcU, *srcV;

  935.     int uvsrc_x, uvsrc_y;

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

  937.     int i, off, tx, ty;

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

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

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

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

  942. 

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

  944.         return;

  945.     if (s->flags & CODEC_FLAG_GRAY)

  946.         return;

  947. 

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

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

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

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

  952.         if (fieldmv)

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

  954.         else

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

  956.     }

  957. 

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

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

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

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

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

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

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

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

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

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

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

  969. 

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

  971.             v_edge_pos--;

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

  973.             uvsrc_y--;

  974.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP)

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

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

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

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

  979.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

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

  982.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

  984.             srcU = s->edge_emu_buffer;

  985.             srcV = s->edge_emu_buffer + 16;

  986. 

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

  988.             if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  989.                 int i, j;

  990.                 uint8_t *src, *src2;

  991. 

  992.                 src  = srcU;

  993.                 src2 = srcV;

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

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

  996.                         src[i]  = v->lutuv[src[i]];

  997.                         src2[i] = v->lutuv[src2[i]];

  998.                     }

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

  1000.                     src2 += s->uvlinesize << 1;

  1001.                 }

  1002.             }

  1003.         }

  1004.         if (!v->rnd) {

  1005.             h264chroma->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1006.             h264chroma->put_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1007.         } else {

  1008.             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]);

  1009.             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]);

  1010.         }

  1011.     }

  1012. }

  1013. 

  1014. /***********************************************************************/

  1015. /**

  1016.  * @name VC-1 Block-level functions

  1017.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1018.  * @{

  1019.  */

  1020. 

  1021. /**

  1022.  * @def GET_MQUANT

  1023.  * @brief Get macroblock-level quantizer scale

  1024.  */

  1025. #define GET_MQUANT()                                           \

  1026.     if (v->dquantfrm) {                                        \

  1027.         int edges = 0;                                         \

  1028.         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \

  1029.             if (v->dqbilevel) {                                \

  1030.                 mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \

  1031.             } else {                                           \

  1032.                 mqdiff = get_bits(gb, 3);                      \

  1033.                 if (mqdiff != 7)                               \

  1034.                     mquant = v->pq + mqdiff;                   \

  1035.                 else                                           \

  1036.                     mquant = get_bits(gb, 5);                  \

  1037.             }                                                  \

  1038.         }                                                      \

  1039.         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \

  1040.             edges = 1 << v->dqsbedge;                          \

  1041.         else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \

  1042.             edges = (3 << v->dqsbedge) % 15;                   \

  1043.         else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \

  1044.             edges = 15;                                        \

  1045.         if ((edges&1) && !s->mb_x)                             \

  1046.             mquant = v->altpq;                                 \

  1047.         if ((edges&2) && s->first_slice_line)                  \

  1048.             mquant = v->altpq;                                 \

  1049.         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \

  1050.             mquant = v->altpq;                                 \

  1051.         if ((edges&8) && s->mb_y == (s->mb_height - 1))        \

  1052.             mquant = v->altpq;                                 \

  1053.         if (!mquant || mquant > 31) {                          \

  1054.             av_log(v->s.avctx, AV_LOG_ERROR,                   \

  1055.                    "Overriding invalid mquant %d\n", mquant);  \

  1056.             mquant = 1;                                        \

  1057.         }                                                      \

  1058.     }

  1059. 

  1060. /**

  1061.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1062.  * @brief Get MV differentials

  1063.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1064.  * @param _dmv_x Horizontal differential for decoded MV

  1065.  * @param _dmv_y Vertical differential for decoded MV

  1066.  */

  1067. #define GET_MVDATA(_dmv_x, _dmv_y)                                      \

  1068.     index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \

  1069.                          VC1_MV_DIFF_VLC_BITS, 2);                      \

  1070.     if (index > 36) {                                                   \

  1071.         mb_has_coeffs = 1;                                              \

  1072.         index -= 37;                                                    \

  1073.     } else                                                              \

  1074.         mb_has_coeffs = 0;                                              \

  1075.     s->mb_intra = 0;                                                    \

  1076.     if (!index) {                                                       \

  1077.         _dmv_x = _dmv_y = 0;                                            \

  1078.     } else if (index == 35) {                                           \

  1079.         _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1080.         _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1081.     } else if (index == 36) {                                           \

  1082.         _dmv_x = 0;                                                     \

  1083.         _dmv_y = 0;                                                     \

  1084.         s->mb_intra = 1;                                                \

  1085.     } else {                                                            \

  1086.         index1 = index % 6;                                             \

  1087.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1088.         else                                   val = 0;                 \

  1089.         if (size_table[index1] - val > 0)                               \

  1090.             val = get_bits(gb, size_table[index1] - val);               \

  1091.         else                                   val = 0;                 \

  1092.         sign = 0 - (val&1);                                             \

  1093.         _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1094.                                                                         \

  1095.         index1 = index / 6;                                             \

  1096.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1097.         else                                   val = 0;                 \

  1098.         if (size_table[index1] - val > 0)                               \

  1099.             val = get_bits(gb, size_table[index1] - val);               \

  1100.         else                                   val = 0;                 \

  1101.         sign = 0 - (val & 1);                                           \

  1102.         _dmv_y = (sign ^ ((val >> 1) + offset_table[index1])) - sign;   \

  1103.     }

  1104. 

  1105. static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,

  1106.                                                    int *dmv_y, int *pred_flag)

  1107. {

  1108.     int index, index1;

  1109.     int extend_x = 0, extend_y = 0;

  1110.     GetBitContext *gb = &v->s.gb;

  1111.     int bits, esc;

  1112.     int val, sign;

  1113.     const int* offs_tab;

  1114. 

  1115.     if (v->numref) {

  1116.         bits = VC1_2REF_MVDATA_VLC_BITS;

  1117.         esc  = 125;

  1118.     } else {

  1119.         bits = VC1_1REF_MVDATA_VLC_BITS;

  1120.         esc  = 71;

  1121.     }

  1122.     switch (v->dmvrange) {

  1123.     case 1:

  1124.         extend_x = 1;

  1125.         break;

  1126.     case 2:

  1127.         extend_y = 1;

  1128.         break;

  1129.     case 3:

  1130.         extend_x = extend_y = 1;

  1131.         break;

  1132.     }

  1133.     index = get_vlc2(gb, v->imv_vlc->table, bits, 3);

  1134.     if (index == esc) {

  1135.         *dmv_x = get_bits(gb, v->k_x);

  1136.         *dmv_y = get_bits(gb, v->k_y);

  1137.         if (v->numref) {

  1138.             if (pred_flag) {

  1139.                 *pred_flag = *dmv_y & 1;

  1140.                 *dmv_y     = (*dmv_y + *pred_flag) >> 1;

  1141.             } else {

  1142.                 *dmv_y     = (*dmv_y + (*dmv_y & 1)) >> 1;

  1143.             }

  1144.         }

  1145.     }

  1146.     else {

  1147.         if (extend_x)

  1148.             offs_tab = offset_table2;

  1149.         else

  1150.             offs_tab = offset_table1;

  1151.         index1 = (index + 1) % 9;

  1152.         if (index1 != 0) {

  1153.             val    = get_bits(gb, index1 + extend_x);

  1154.             sign   = 0 -(val & 1);

  1155.             *dmv_x = (sign ^ ((val >> 1) + offs_tab[index1])) - sign;

  1156.         } else

  1157.             *dmv_x = 0;

  1158.         if (extend_y)

  1159.             offs_tab = offset_table2;

  1160.         else

  1161.             offs_tab = offset_table1;

  1162.         index1 = (index + 1) / 9;

  1163.         if (index1 > v->numref) {

  1164.             val    = get_bits(gb, (index1 + (extend_y << v->numref)) >> v->numref);

  1165.             sign   = 0 - (val & 1);

  1166.             *dmv_y = (sign ^ ((val >> 1) + offs_tab[index1 >> v->numref])) - sign;

  1167.         } else

  1168.             *dmv_y = 0;

  1169.         if (v->numref && pred_flag)

  1170.             *pred_flag = index1 & 1;

  1171.     }

  1172. }

  1173. 

  1174. static av_always_inline int scaleforsame_x(VC1Context *v, int n /* MV */, int dir)

  1175. {

  1176.     int scaledvalue, refdist;

  1177.     int scalesame1, scalesame2;

  1178.     int scalezone1_x, zone1offset_x;

  1179.     int table_index = dir ^ v->second_field;

  1180. 

  1181.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1182.         refdist = v->refdist;

  1183.     else

  1184.         refdist = dir ? v->brfd : v->frfd;

  1185.     if (refdist > 3)

  1186.         refdist = 3;

  1187.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1188.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1189.     scalezone1_x  = ff_vc1_field_mvpred_scales[table_index][3][refdist];

  1190.     zone1offset_x = ff_vc1_field_mvpred_scales[table_index][5][refdist];

  1191. 

  1192.     if (FFABS(n) > 255)

  1193.         scaledvalue = n;

  1194.     else {

  1195.         if (FFABS(n) < scalezone1_x)

  1196.             scaledvalue = (n * scalesame1) >> 8;

  1197.         else {

  1198.             if (n < 0)

  1199.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_x;

  1200.             else

  1201.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_x;

  1202.         }

  1203.     }

  1204.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1205. }

  1206. 

  1207. static av_always_inline int scaleforsame_y(VC1Context *v, int i, int n /* MV */, int dir)

  1208. {

  1209.     int scaledvalue, refdist;

  1210.     int scalesame1, scalesame2;

  1211.     int scalezone1_y, zone1offset_y;

  1212.     int table_index = dir ^ v->second_field;

  1213. 

  1214.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1215.         refdist = v->refdist;

  1216.     else

  1217.         refdist = dir ? v->brfd : v->frfd;

  1218.     if (refdist > 3)

  1219.         refdist = 3;

  1220.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1221.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1222.     scalezone1_y  = ff_vc1_field_mvpred_scales[table_index][4][refdist];

  1223.     zone1offset_y = ff_vc1_field_mvpred_scales[table_index][6][refdist];

  1224. 

  1225.     if (FFABS(n) > 63)

  1226.         scaledvalue = n;

  1227.     else {

  1228.         if (FFABS(n) < scalezone1_y)

  1229.             scaledvalue = (n * scalesame1) >> 8;

  1230.         else {

  1231.             if (n < 0)

  1232.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_y;

  1233.             else

  1234.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_y;

  1235.         }

  1236.     }

  1237. 

  1238.     if (v->cur_field_type && !v->ref_field_type[dir])

  1239.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1240.     else

  1241.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1242. }

  1243. 

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

  1245. {

  1246.     int scalezone1_x, zone1offset_x;

  1247.     int scaleopp1, scaleopp2, brfd;

  1248.     int scaledvalue;

  1249. 

  1250.     brfd = FFMIN(v->brfd, 3);

  1251.     scalezone1_x  = ff_vc1_b_field_mvpred_scales[3][brfd];

  1252.     zone1offset_x = ff_vc1_b_field_mvpred_scales[5][brfd];

  1253.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1254.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1255. 

  1256.     if (FFABS(n) > 255)

  1257.         scaledvalue = n;

  1258.     else {

  1259.         if (FFABS(n) < scalezone1_x)

  1260.             scaledvalue = (n * scaleopp1) >> 8;

  1261.         else {

  1262.             if (n < 0)

  1263.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_x;

  1264.             else

  1265.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_x;

  1266.         }

  1267.     }

  1268.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1269. }

  1270. 

  1271. static av_always_inline int scaleforopp_y(VC1Context *v, int n /* MV */, int dir)

  1272. {

  1273.     int scalezone1_y, zone1offset_y;

  1274.     int scaleopp1, scaleopp2, brfd;

  1275.     int scaledvalue;

  1276. 

  1277.     brfd = FFMIN(v->brfd, 3);

  1278.     scalezone1_y  = ff_vc1_b_field_mvpred_scales[4][brfd];

  1279.     zone1offset_y = ff_vc1_b_field_mvpred_scales[6][brfd];

  1280.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1281.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1282. 

  1283.     if (FFABS(n) > 63)

  1284.         scaledvalue = n;

  1285.     else {

  1286.         if (FFABS(n) < scalezone1_y)

  1287.             scaledvalue = (n * scaleopp1) >> 8;

  1288.         else {

  1289.             if (n < 0)

  1290.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_y;

  1291.             else

  1292.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_y;

  1293.         }

  1294.     }

  1295.     if (v->cur_field_type && !v->ref_field_type[dir]) {

  1296.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1297.     } else {

  1298.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1299.     }

  1300. }

  1301. 

  1302. static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */,

  1303.                                          int dim, int dir)

  1304. {

  1305.     int brfd, scalesame;

  1306.     int hpel = 1 - v->s.quarter_sample;

  1307. 

  1308.     n >>= hpel;

  1309.     if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {

  1310.         if (dim)

  1311.             n = scaleforsame_y(v, i, n, dir) << hpel;

  1312.         else

  1313.             n = scaleforsame_x(v, n, dir) << hpel;

  1314.         return n;

  1315.     }

  1316.     brfd      = FFMIN(v->brfd, 3);

  1317.     scalesame = ff_vc1_b_field_mvpred_scales[0][brfd];

  1318. 

  1319.     n = (n * scalesame >> 8) << hpel;

  1320.     return n;

  1321. }

  1322. 

  1323. static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */,

  1324.                                         int dim, int dir)

  1325. {

  1326.     int refdist, scaleopp;

  1327.     int hpel = 1 - v->s.quarter_sample;

  1328. 

  1329.     n >>= hpel;

  1330.     if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) {

  1331.         if (dim)

  1332.             n = scaleforopp_y(v, n, dir) << hpel;

  1333.         else

  1334.             n = scaleforopp_x(v, n) << hpel;

  1335.         return n;

  1336.     }

  1337.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1338.         refdist = FFMIN(v->refdist, 3);

  1339.     else

  1340.         refdist = dir ? v->brfd : v->frfd;

  1341.     scaleopp = ff_vc1_field_mvpred_scales[dir ^ v->second_field][0][refdist];

  1342. 

  1343.     n = (n * scaleopp >> 8) << hpel;

  1344.     return n;

  1345. }

  1346. 

  1347. /** Predict and set motion vector

  1348.  */

  1349. static inline void vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,

  1350.                                int mv1, int r_x, int r_y, uint8_t* is_intra,

  1351.                                int pred_flag, int dir)

  1352. {

  1353.     MpegEncContext *s = &v->s;

  1354.     int xy, wrap, off = 0;

  1355.     int16_t *A, *B, *C;

  1356.     int px, py;

  1357.     int sum;

  1358.     int mixedmv_pic, num_samefield = 0, num_oppfield = 0;

  1359.     int opposite, a_f, b_f, c_f;

  1360.     int16_t field_predA[2];

  1361.     int16_t field_predB[2];

  1362.     int16_t field_predC[2];

  1363.     int a_valid, b_valid, c_valid;

  1364.     int hybridmv_thresh, y_bias = 0;

  1365. 

  1366.     if (v->mv_mode == MV_PMODE_MIXED_MV ||

  1367.         ((v->mv_mode == MV_PMODE_INTENSITY_COMP) && (v->mv_mode2 == MV_PMODE_MIXED_MV)))

  1368.         mixedmv_pic = 1;

  1369.     else

  1370.         mixedmv_pic = 0;

  1371.     /* scale MV difference to be quad-pel */

  1372.     dmv_x <<= 1 - s->quarter_sample;

  1373.     dmv_y <<= 1 - s->quarter_sample;

  1374. 

  1375.     wrap = s->b8_stride;

  1376.     xy   = s->block_index[n];

  1377. 

  1378.     if (s->mb_intra) {

  1379.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy + v->blocks_off][0] = 0;

  1380.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy + v->blocks_off][1] = 0;

  1381.         s->current_picture.motion_val[1][xy + v->blocks_off][0] = 0;

  1382.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = 0;

  1383.         if (mv1) { /* duplicate motion data for 1-MV block */

  1384.             s->current_picture.motion_val[0][xy + 1 + v->blocks_off][0]        = 0;

  1385.             s->current_picture.motion_val[0][xy + 1 + v->blocks_off][1]        = 0;

  1386.             s->current_picture.motion_val[0][xy + wrap + v->blocks_off][0]     = 0;

  1387.             s->current_picture.motion_val[0][xy + wrap + v->blocks_off][1]     = 0;

  1388.             s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][0] = 0;

  1389.             s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][1] = 0;

  1390.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  1391.             s->current_picture.motion_val[1][xy + 1 + v->blocks_off][0]        = 0;

  1392.             s->current_picture.motion_val[1][xy + 1 + v->blocks_off][1]        = 0;

  1393.             s->current_picture.motion_val[1][xy + wrap][0]                     = 0;

  1394.             s->current_picture.motion_val[1][xy + wrap + v->blocks_off][1]     = 0;

  1395.             s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][0] = 0;

  1396.             s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][1] = 0;

  1397.         }

  1398.         return;

  1399.     }

  1400. 

  1401.     C = s->current_picture.motion_val[dir][xy -    1 + v->blocks_off];

  1402.     A = s->current_picture.motion_val[dir][xy - wrap + v->blocks_off];

  1403.     if (mv1) {

  1404.         if (v->field_mode && mixedmv_pic)

  1405.             off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1406.         else

  1407.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1408.     } else {

  1409.         //in 4-MV mode different blocks have different B predictor position

  1410.         switch (n) {

  1411.         case 0:

  1412.             off = (s->mb_x > 0) ? -1 : 1;

  1413.             break;

  1414.         case 1:

  1415.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1416.             break;

  1417.         case 2:

  1418.             off = 1;

  1419.             break;

  1420.         case 3:

  1421.             off = -1;

  1422.         }

  1423.     }

  1424.     B = s->current_picture.motion_val[dir][xy - wrap + off + v->blocks_off];

  1425. 

  1426.     a_valid = !s->first_slice_line || (n == 2 || n == 3);

  1427.     b_valid = a_valid && (s->mb_width > 1);

  1428.     c_valid = s->mb_x || (n == 1 || n == 3);

  1429.     if (v->field_mode) {

  1430.         a_valid = a_valid && !is_intra[xy - wrap];

  1431.         b_valid = b_valid && !is_intra[xy - wrap + off];

  1432.         c_valid = c_valid && !is_intra[xy - 1];

  1433.     }

  1434. 

  1435.     if (a_valid) {

  1436.         a_f = v->mv_f[dir][xy - wrap + v->blocks_off];

  1437.         num_oppfield  += a_f;

  1438.         num_samefield += 1 - a_f;

  1439.         field_predA[0] = A[0];

  1440.         field_predA[1] = A[1];

  1441.     } else {

  1442.         field_predA[0] = field_predA[1] = 0;

  1443.         a_f = 0;

  1444.     }

  1445.     if (b_valid) {

  1446.         b_f = v->mv_f[dir][xy - wrap + off + v->blocks_off];

  1447.         num_oppfield  += b_f;

  1448.         num_samefield += 1 - b_f;

  1449.         field_predB[0] = B[0];

  1450.         field_predB[1] = B[1];

  1451.     } else {

  1452.         field_predB[0] = field_predB[1] = 0;

  1453.         b_f = 0;

  1454.     }

  1455.     if (c_valid) {

  1456.         c_f = v->mv_f[dir][xy - 1 + v->blocks_off];

  1457.         num_oppfield  += c_f;

  1458.         num_samefield += 1 - c_f;

  1459.         field_predC[0] = C[0];

  1460.         field_predC[1] = C[1];

  1461.     } else {

  1462.         field_predC[0] = field_predC[1] = 0;

  1463.         c_f = 0;

  1464.     }

  1465. 

  1466.     if (v->field_mode) {

  1467.         if (!v->numref)

  1468.             // REFFIELD determines if the last field or the second-last field is

  1469.             // to be used as reference

  1470.             opposite = 1 - v->reffield;

  1471.         else {

  1472.             if (num_samefield <= num_oppfield)

  1473.                 opposite = 1 - pred_flag;

  1474.             else

  1475.                 opposite = pred_flag;

  1476.         }

  1477.     } else

  1478.         opposite = 0;

  1479.     if (opposite) {

  1480.         if (a_valid && !a_f) {

  1481.             field_predA[0] = scaleforopp(v, field_predA[0], 0, dir);

  1482.             field_predA[1] = scaleforopp(v, field_predA[1], 1, dir);

  1483.         }

  1484.         if (b_valid && !b_f) {

  1485.             field_predB[0] = scaleforopp(v, field_predB[0], 0, dir);

  1486.             field_predB[1] = scaleforopp(v, field_predB[1], 1, dir);

  1487.         }

  1488.         if (c_valid && !c_f) {

  1489.             field_predC[0] = scaleforopp(v, field_predC[0], 0, dir);

  1490.             field_predC[1] = scaleforopp(v, field_predC[1], 1, dir);

  1491.         }

  1492.         v->mv_f[dir][xy + v->blocks_off] = 1;

  1493.         v->ref_field_type[dir] = !v->cur_field_type;

  1494.     } else {

  1495.         if (a_valid && a_f) {

  1496.             field_predA[0] = scaleforsame(v, n, field_predA[0], 0, dir);

  1497.             field_predA[1] = scaleforsame(v, n, field_predA[1], 1, dir);

  1498.         }

  1499.         if (b_valid && b_f) {

  1500.             field_predB[0] = scaleforsame(v, n, field_predB[0], 0, dir);

  1501.             field_predB[1] = scaleforsame(v, n, field_predB[1], 1, dir);

  1502.         }

  1503.         if (c_valid && c_f) {

  1504.             field_predC[0] = scaleforsame(v, n, field_predC[0], 0, dir);

  1505.             field_predC[1] = scaleforsame(v, n, field_predC[1], 1, dir);

  1506.         }

  1507.         v->mv_f[dir][xy + v->blocks_off] = 0;

  1508.         v->ref_field_type[dir] = v->cur_field_type;

  1509.     }

  1510. 

  1511.     if (a_valid) {

  1512.         px = field_predA[0];

  1513.         py = field_predA[1];

  1514.     } else if (c_valid) {

  1515.         px = field_predC[0];

  1516.         py = field_predC[1];

  1517.     } else if (b_valid) {

  1518.         px = field_predB[0];

  1519.         py = field_predB[1];

  1520.     } else {

  1521.         px = 0;

  1522.         py = 0;

  1523.     }

  1524. 

  1525.     if (num_samefield + num_oppfield > 1) {

  1526.         px = mid_pred(field_predA[0], field_predB[0], field_predC[0]);

  1527.         py = mid_pred(field_predA[1], field_predB[1], field_predC[1]);

  1528.     }

  1529. 

  1530.     /* Pullback MV as specified in 8.3.5.3.4 */

  1531.     if (!v->field_mode) {

  1532.         int qx, qy, X, Y;

  1533.         qx = (s->mb_x << 6) + ((n == 1 || n == 3) ? 32 : 0);

  1534.         qy = (s->mb_y << 6) + ((n == 2 || n == 3) ? 32 : 0);

  1535.         X  = (s->mb_width  << 6) - 4;

  1536.         Y  = (s->mb_height << 6) - 4;

  1537.         if (mv1) {

  1538.             if (qx + px < -60) px = -60 - qx;

  1539.             if (qy + py < -60) py = -60 - qy;

  1540.         } else {

  1541.             if (qx + px < -28) px = -28 - qx;

  1542.             if (qy + py < -28) py = -28 - qy;

  1543.         }

  1544.         if (qx + px > X) px = X - qx;

  1545.         if (qy + py > Y) py = Y - qy;

  1546.     }

  1547. 

  1548.     if (!v->field_mode || s->pict_type != AV_PICTURE_TYPE_B) {

  1549.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 (also 10.3.5.4.3.5) */

  1550.         hybridmv_thresh = 32;

  1551.         if (a_valid && c_valid) {

  1552.             if (is_intra[xy - wrap])

  1553.                 sum = FFABS(px) + FFABS(py);

  1554.             else

  1555.                 sum = FFABS(px - field_predA[0]) + FFABS(py - field_predA[1]);

  1556.             if (sum > hybridmv_thresh) {

  1557.                 if (get_bits1(&s->gb)) {     // read HYBRIDPRED bit

  1558.                     px = field_predA[0];

  1559.                     py = field_predA[1];

  1560.                 } else {

  1561.                     px = field_predC[0];

  1562.                     py = field_predC[1];

  1563.                 }

  1564.             } else {

  1565.                 if (is_intra[xy - 1])

  1566.                     sum = FFABS(px) + FFABS(py);

  1567.                 else

  1568.                     sum = FFABS(px - field_predC[0]) + FFABS(py - field_predC[1]);

  1569.                 if (sum > hybridmv_thresh) {

  1570.                     if (get_bits1(&s->gb)) {

  1571.                         px = field_predA[0];

  1572.                         py = field_predA[1];

  1573.                     } else {

  1574.                         px = field_predC[0];

  1575.                         py = field_predC[1];

  1576.                     }

  1577.                 }

  1578.             }

  1579.         }

  1580.     }

  1581. 

  1582.     if (v->field_mode && v->numref)

  1583.         r_y >>= 1;

  1584.     if (v->field_mode && v->cur_field_type && v->ref_field_type[dir] == 0)

  1585.         y_bias = 1;

  1586.     /* store MV using signed modulus of MV range defined in 4.11 */

  1587.     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;

  1588.     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;

  1589.     if (mv1) { /* duplicate motion data for 1-MV block */

  1590.         s->current_picture.motion_val[dir][xy +    1 +     v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1591.         s->current_picture.motion_val[dir][xy +    1 +     v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1592.         s->current_picture.motion_val[dir][xy + wrap +     v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1593.         s->current_picture.motion_val[dir][xy + wrap +     v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1594.         s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];

  1595.         s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

  1596.         v->mv_f[dir][xy +    1 + v->blocks_off] = v->mv_f[dir][xy +            v->blocks_off];

  1597.         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];

  1598.     }

  1599. }

  1600. 

  1601. /** Predict and set motion vector for interlaced frame picture MBs

  1602.  */

  1603. static inline void vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,

  1604.                                      int mvn, int r_x, int r_y, uint8_t* is_intra)

  1605. {

  1606.     MpegEncContext *s = &v->s;

  1607.     int xy, wrap, off = 0;

  1608.     int A[2], B[2], C[2];

  1609.     int px, py;

  1610.     int a_valid = 0, b_valid = 0, c_valid = 0;

  1611.     int field_a, field_b, field_c; // 0: same, 1: opposit

  1612.     int total_valid, num_samefield, num_oppfield;

  1613.     int pos_c, pos_b, n_adj;

  1614. 

  1615.     wrap = s->b8_stride;

  1616.     xy = s->block_index[n];

  1617. 

  1618.     if (s->mb_intra) {

  1619.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1620.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1621.         s->current_picture.motion_val[1][xy][0] = 0;

  1622.         s->current_picture.motion_val[1][xy][1] = 0;

  1623.         if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1624.             s->current_picture.motion_val[0][xy + 1][0]        = 0;

  1625.             s->current_picture.motion_val[0][xy + 1][1]        = 0;

  1626.             s->current_picture.motion_val[0][xy + wrap][0]     = 0;

  1627.             s->current_picture.motion_val[0][xy + wrap][1]     = 0;

  1628.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1629.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1630.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  1631.             s->current_picture.motion_val[1][xy + 1][0]        = 0;

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

  1633.             s->current_picture.motion_val[1][xy + wrap][0]     = 0;

  1634.             s->current_picture.motion_val[1][xy + wrap][1]     = 0;

  1635.             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;

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

  1637.         }

  1638.         return;

  1639.     }

  1640. 

  1641.     off = ((n == 0) || (n == 1)) ? 1 : -1;

  1642.     /* predict A */

  1643.     if (s->mb_x || (n == 1) || (n == 3)) {

  1644.         if ((v->blk_mv_type[xy]) // current block (MB) has a field MV

  1645.             || (!v->blk_mv_type[xy] && !v->blk_mv_type[xy - 1])) { // or both have frame MV

  1646.             A[0] = s->current_picture.motion_val[0][xy - 1][0];

  1647.             A[1] = s->current_picture.motion_val[0][xy - 1][1];

  1648.             a_valid = 1;

  1649.         } else { // current block has frame mv and cand. has field MV (so average)

  1650.             A[0] = (s->current_picture.motion_val[0][xy - 1][0]

  1651.                     + s->current_picture.motion_val[0][xy - 1 + off * wrap][0] + 1) >> 1;

  1652.             A[1] = (s->current_picture.motion_val[0][xy - 1][1]

  1653.                     + s->current_picture.motion_val[0][xy - 1 + off * wrap][1] + 1) >> 1;

  1654.             a_valid = 1;

  1655.         }

  1656.         if (!(n & 1) && v->is_intra[s->mb_x - 1]) {

  1657.             a_valid = 0;

  1658.             A[0] = A[1] = 0;

  1659.         }

  1660.     } else

  1661.         A[0] = A[1] = 0;

  1662.     /* Predict B and C */

  1663.     B[0] = B[1] = C[0] = C[1] = 0;

  1664.     if (n == 0 || n == 1 || v->blk_mv_type[xy]) {

  1665.         if (!s->first_slice_line) {

  1666.             if (!v->is_intra[s->mb_x - s->mb_stride]) {

  1667.                 b_valid = 1;

  1668.                 n_adj   = n | 2;

  1669.                 pos_b   = s->block_index[n_adj] - 2 * wrap;

  1670.                 if (v->blk_mv_type[pos_b] && v->blk_mv_type[xy]) {

  1671.                     n_adj = (n & 2) | (n & 1);

  1672.                 }

  1673.                 B[0] = s->current_picture.motion_val[0][s->block_index[n_adj] - 2 * wrap][0];

  1674.                 B[1] = s->current_picture.motion_val[0][s->block_index[n_adj] - 2 * wrap][1];

  1675.                 if (v->blk_mv_type[pos_b] && !v->blk_mv_type[xy]) {

  1676.                     B[0] = (B[0] + s->current_picture.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap][0] + 1) >> 1;

  1677.                     B[1] = (B[1] + s->current_picture.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap][1] + 1) >> 1;

  1678.                 }

  1679.             }

  1680.             if (s->mb_width > 1) {

  1681.                 if (!v->is_intra[s->mb_x - s->mb_stride + 1]) {

  1682.                     c_valid = 1;

  1683.                     n_adj   = 2;

  1684.                     pos_c   = s->block_index[2] - 2 * wrap + 2;

  1685.                     if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1686.                         n_adj = n & 2;

  1687.                     }

  1688.                     C[0] = s->current_picture.motion_val[0][s->block_index[n_adj] - 2 * wrap + 2][0];

  1689.                     C[1] = s->current_picture.motion_val[0][s->block_index[n_adj] - 2 * wrap + 2][1];

  1690.                     if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1691.                         C[0] = (1 + C[0] + (s->current_picture.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap + 2][0])) >> 1;

  1692.                         C[1] = (1 + C[1] + (s->current_picture.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap + 2][1])) >> 1;

  1693.                     }

  1694.                     if (s->mb_x == s->mb_width - 1) {

  1695.                         if (!v->is_intra[s->mb_x - s->mb_stride - 1]) {

  1696.                             c_valid = 1;

  1697.                             n_adj   = 3;

  1698.                             pos_c   = s->block_index[3] - 2 * wrap - 2;

  1699.                             if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1700.                                 n_adj = n | 1;

  1701.                             }

  1702.                             C[0] = s->current_picture.motion_val[0][s->block_index[n_adj] - 2 * wrap - 2][0];

  1703.                             C[1] = s->current_picture.motion_val[0][s->block_index[n_adj] - 2 * wrap - 2][1];

  1704.                             if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1705.                                 C[0] = (1 + C[0] + s->current_picture.motion_val[0][s->block_index[1] - 2 * wrap - 2][0]) >> 1;

  1706.                                 C[1] = (1 + C[1] + s->current_picture.motion_val[0][s->block_index[1] - 2 * wrap - 2][1]) >> 1;

  1707.                             }

  1708.                         } else

  1709.                             c_valid = 0;

  1710.                     }

  1711.                 }

  1712.             }

  1713.         }

  1714.     } else {

  1715.         pos_b   = s->block_index[1];

  1716.         b_valid = 1;

  1717.         B[0]    = s->current_picture.motion_val[0][pos_b][0];

  1718.         B[1]    = s->current_picture.motion_val[0][pos_b][1];

  1719.         pos_c   = s->block_index[0];

  1720.         c_valid = 1;

  1721.         C[0]    = s->current_picture.motion_val[0][pos_c][0];

  1722.         C[1]    = s->current_picture.motion_val[0][pos_c][1];

  1723.     }

  1724. 

  1725.     total_valid = a_valid + b_valid + c_valid;

  1726.     // check if predictor A is out of bounds

  1727.     if (!s->mb_x && !(n == 1 || n == 3)) {

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

  1729.     }

  1730.     // check if predictor B is out of bounds

  1731.     if ((s->first_slice_line && v->blk_mv_type[xy]) || (s->first_slice_line && !(n & 2))) {

  1732.         B[0] = B[1] = C[0] = C[1] = 0;

  1733.     }

  1734.     if (!v->blk_mv_type[xy]) {

  1735.         if (s->mb_width == 1) {

  1736.             px = B[0];

  1737.             py = B[1];

  1738.         } else {

  1739.             if (total_valid >= 2) {

  1740.                 px = mid_pred(A[0], B[0], C[0]);

  1741.                 py = mid_pred(A[1], B[1], C[1]);

  1742.             } else if (total_valid) {

  1743.                 if (a_valid) { px = A[0]; py = A[1]; }

  1744.                 if (b_valid) { px = B[0]; py = B[1]; }

  1745.                 if (c_valid) { px = C[0]; py = C[1]; }

  1746.             } else

  1747.                 px = py = 0;

  1748.         }

  1749.     } else {

  1750.         if (a_valid)

  1751.             field_a = (A[1] & 4) ? 1 : 0;

  1752.         else

  1753.             field_a = 0;

  1754.         if (b_valid)

  1755.             field_b = (B[1] & 4) ? 1 : 0;

  1756.         else

  1757.             field_b = 0;

  1758.         if (c_valid)

  1759.             field_c = (C[1] & 4) ? 1 : 0;

  1760.         else

  1761.             field_c = 0;

  1762. 

  1763.         num_oppfield  = field_a + field_b + field_c;

  1764.         num_samefield = total_valid - num_oppfield;

  1765.         if (total_valid == 3) {

  1766.             if ((num_samefield == 3) || (num_oppfield == 3)) {

  1767.                 px = mid_pred(A[0], B[0], C[0]);

  1768.                 py = mid_pred(A[1], B[1], C[1]);

  1769.             } else if (num_samefield >= num_oppfield) {

  1770.                 /* take one MV from same field set depending on priority

  1771.                 the check for B may not be necessary */

  1772.                 px = !field_a ? A[0] : B[0];

  1773.                 py = !field_a ? A[1] : B[1];

  1774.             } else {

  1775.                 px =  field_a ? A[0] : B[0];

  1776.                 py =  field_a ? A[1] : B[1];

  1777.             }

  1778.         } else if (total_valid == 2) {

  1779.             if (num_samefield >= num_oppfield) {

  1780.                 if (!field_a && a_valid) {

  1781.                     px = A[0];

  1782.                     py = A[1];

  1783.                 } else if (!field_b && b_valid) {

  1784.                     px = B[0];

  1785.                     py = B[1];

  1786.                 } else if (c_valid) {

  1787.                     px = C[0];

  1788.                     py = C[1];

  1789.                 } else px = py = 0;

  1790.             } else {

  1791.                 if (field_a && a_valid) {

  1792.                     px = A[0];

  1793.                     py = A[1];

  1794.                 } else if (field_b && b_valid) {

  1795.                     px = B[0];

  1796.                     py = B[1];

  1797.                 } else if (c_valid) {

  1798.                     px = C[0];

  1799.                     py = C[1];

  1800.                 }

  1801.             }

  1802.         } else if (total_valid == 1) {

  1803.             px = (a_valid) ? A[0] : ((b_valid) ? B[0] : C[0]);

  1804.             py = (a_valid) ? A[1] : ((b_valid) ? B[1] : C[1]);

  1805.         } else

  1806.             px = py = 0;

  1807.     }

  1808. 

  1809.     /* store MV using signed modulus of MV range defined in 4.11 */

  1810.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1811.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1812.     if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1813.         s->current_picture.motion_val[0][xy +    1    ][0] = s->current_picture.motion_val[0][xy][0];

  1814.         s->current_picture.motion_val[0][xy +    1    ][1] = s->current_picture.motion_val[0][xy][1];

  1815.         s->current_picture.motion_val[0][xy + wrap    ][0] = s->current_picture.motion_val[0][xy][0];

  1816.         s->current_picture.motion_val[0][xy + wrap    ][1] = s->current_picture.motion_val[0][xy][1];

  1817.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1818.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1819.     } else if (mvn == 2) { /* duplicate motion data for 2-Field MV block */

  1820.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1821.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  1822.         s->mv[0][n + 1][0] = s->mv[0][n][0];

  1823.         s->mv[0][n + 1][1] = s->mv[0][n][1];

  1824.     }

  1825. }

  1826. 

  1827. /** Motion compensation for direct or interpolated blocks in B-frames

  1828.  */

  1829. static void vc1_interp_mc(VC1Context *v)

  1830. {

  1831.     MpegEncContext *s = &v->s;

  1832.     DSPContext *dsp = &v->s.dsp;

  1833.     H264ChromaContext *h264chroma = &v->h264chroma;

  1834.     uint8_t *srcY, *srcU, *srcV;

  1835.     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1836.     int off, off_uv;

  1837.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  1838. 

  1839.     if (!v->field_mode && !v->s.next_picture.f.data[0])

  1840.         return;

  1841. 

  1842.     mx   = s->mv[1][0][0];

  1843.     my   = s->mv[1][0][1];

  1844.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1845.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1846.     if (v->field_mode) {

  1847.         if (v->cur_field_type != v->ref_field_type[1])

  1848.             my   = my   - 2 + 4 * v->cur_field_type;

  1849.             uvmy = uvmy - 2 + 4 * v->cur_field_type;

  1850.     }

  1851.     if (v->fastuvmc) {

  1852.         uvmx = uvmx + ((uvmx < 0) ? -(uvmx & 1) : (uvmx & 1));

  1853.         uvmy = uvmy + ((uvmy < 0) ? -(uvmy & 1) : (uvmy & 1));

  1854.     }

  1855.     srcY = s->next_picture.f.data[0];

  1856.     srcU = s->next_picture.f.data[1];

  1857.     srcV = s->next_picture.f.data[2];

  1858. 

  1859.     src_x   = s->mb_x * 16 + (mx   >> 2);

  1860.     src_y   = s->mb_y * 16 + (my   >> 2);

  1861.     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);

  1862.     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

  1863. 

  1864.     if (v->profile != PROFILE_ADVANCED) {

  1865.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1866.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1867.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1868.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1869.     } else {

  1870.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1871.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1872.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1873.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1874.     }

  1875. 

  1876.     srcY += src_y   * s->linesize   + src_x;

  1877.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1878.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1879. 

  1880.     if (v->field_mode && v->ref_field_type[1]) {

  1881.         srcY += s->current_picture_ptr->f.linesize[0];

  1882.         srcU += s->current_picture_ptr->f.linesize[1];

  1883.         srcV += s->current_picture_ptr->f.linesize[2];

  1884.     }

  1885. 

  1886.     /* for grayscale we should not try to read from unknown area */

  1887.     if (s->flags & CODEC_FLAG_GRAY) {

  1888.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1889.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1890.     }

  1891. 

  1892.     if (v->rangeredfrm || s->h_edge_pos < 22 || v_edge_pos < 22

  1893.         || (unsigned)(src_x - 1) > s->h_edge_pos - (mx & 3) - 16 - 3

  1894.         || (unsigned)(src_y - 1) > v_edge_pos    - (my & 3) - 16 - 3) {

  1895.         uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

  1896. 

  1897.         srcY -= s->mspel * (1 + s->linesize);

  1898.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize,

  1899.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

  1900.                                  src_x - s->mspel, src_y - s->mspel,

  1901.                                  s->h_edge_pos, v_edge_pos);

  1902.         srcY = s->edge_emu_buffer;

  1903.         s->vdsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8 + 1, 8 + 1,

  1904.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1905.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8 + 1, 8 + 1,

  1906.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1907.         srcU = uvbuf;

  1908.         srcV = uvbuf + 16;

  1909.         /* if we deal with range reduction we need to scale source blocks */

  1910.         if (v->rangeredfrm) {

  1911.             int i, j;

  1912.             uint8_t *src, *src2;

  1913. 

  1914.             src = srcY;

  1915.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  1916.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  1917.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1918.                 src += s->linesize;

  1919.             }

  1920.             src = srcU;

  1921.             src2 = srcV;

  1922.             for (j = 0; j < 9; j++) {

  1923.                 for (i = 0; i < 9; i++) {

  1924.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  1925.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1926.                 }

  1927.                 src  += s->uvlinesize;

  1928.                 src2 += s->uvlinesize;

  1929.             }

  1930.         }

  1931.         srcY += s->mspel * (1 + s->linesize);

  1932.     }

  1933. 

  1934.     if (v->field_mode && v->cur_field_type) {

  1935.         off    = s->current_picture_ptr->f.linesize[0];

  1936.         off_uv = s->current_picture_ptr->f.linesize[1];

  1937.     } else {

  1938.         off    = 0;

  1939.         off_uv = 0;

  1940.     }

  1941. 

  1942.     if (s->mspel) {

  1943.         dxy = ((my & 3) << 2) | (mx & 3);

  1944.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);

  1945.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);

  1946.         srcY += s->linesize * 8;

  1947.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  1948.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  1949.     } else { // hpel mc

  1950.         dxy = (my & 2) | ((mx & 2) >> 1);

  1951. 

  1952.         if (!v->rnd)

  1953.             dsp->avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  1954.         else

  1955.             dsp->avg_no_rnd_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize, 16);

  1956.     }

  1957. 

  1958.     if (s->flags & CODEC_FLAG_GRAY) return;

  1959.     /* Chroma MC always uses qpel blilinear */

  1960.     uvmx = (uvmx & 3) << 1;

  1961.     uvmy = (uvmy & 3) << 1;

  1962.     if (!v->rnd) {

  1963.         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  1964.         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  1965.     } else {

  1966.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  1967.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  1968.     }

  1969. }

  1970. 

  1971. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1972. {

  1973.     int n = bfrac;

  1974. 

  1975. #if B_FRACTION_DEN==256

  1976.     if (inv)

  1977.         n -= 256;

  1978.     if (!qs)

  1979.         return 2 * ((value * n + 255) >> 9);

  1980.     return (value * n + 128) >> 8;

  1981. #else

  1982.     if (inv)

  1983.         n -= B_FRACTION_DEN;

  1984.     if (!qs)

  1985.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1986.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1987. #endif

  1988. }

  1989. 

  1990. /** Reconstruct motion vector for B-frame and do motion compensation

  1991.  */

  1992. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],

  1993.                             int direct, int mode)

  1994. {

  1995.     if (v->use_ic) {

  1996.         v->mv_mode2 = v->mv_mode;

  1997.         v->mv_mode  = MV_PMODE_INTENSITY_COMP;

  1998.     }

  1999.     if (direct) {

  2000.         vc1_mc_1mv(v, 0);

  2001.         vc1_interp_mc(v);

  2002.         if (v->use_ic)

  2003.             v->mv_mode = v->mv_mode2;

  2004.         return;

  2005.     }

  2006.     if (mode == BMV_TYPE_INTERPOLATED) {

  2007.         vc1_mc_1mv(v, 0);

  2008.         vc1_interp_mc(v);

  2009.         if (v->use_ic)

  2010.             v->mv_mode = v->mv_mode2;

  2011.         return;

  2012.     }

  2013. 

  2014.     if (v->use_ic && (mode == BMV_TYPE_BACKWARD))

  2015.         v->mv_mode = v->mv_mode2;

  2016.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  2017.     if (v->use_ic)

  2018.         v->mv_mode = v->mv_mode2;

  2019. }

  2020. 

  2021. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],

  2022.                                  int direct, int mvtype)

  2023. {

  2024.     MpegEncContext *s = &v->s;

  2025.     int xy, wrap, off = 0;

  2026.     int16_t *A, *B, *C;

  2027.     int px, py;

  2028.     int sum;

  2029.     int r_x, r_y;

  2030.     const uint8_t *is_intra = v->mb_type[0];

  2031. 

  2032.     r_x = v->range_x;

  2033.     r_y = v->range_y;

  2034.     /* scale MV difference to be quad-pel */

  2035.     dmv_x[0] <<= 1 - s->quarter_sample;

  2036.     dmv_y[0] <<= 1 - s->quarter_sample;

  2037.     dmv_x[1] <<= 1 - s->quarter_sample;

  2038.     dmv_y[1] <<= 1 - s->quarter_sample;

  2039. 

  2040.     wrap = s->b8_stride;

  2041.     xy = s->block_index[0];

  2042. 

  2043.     if (s->mb_intra) {

  2044.         s->current_picture.motion_val[0][xy + v->blocks_off][0] =

  2045.         s->current_picture.motion_val[0][xy + v->blocks_off][1] =

  2046.         s->current_picture.motion_val[1][xy + v->blocks_off][0] =

  2047.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = 0;

  2048.         return;

  2049.     }

  2050.     if (!v->field_mode) {

  2051.         s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  2052.         s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  2053.         s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  2054.         s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  2055. 

  2056.         /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  2057.         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));

  2058.         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));

  2059.         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));

  2060.         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));

  2061.     }

  2062.     if (direct) {

  2063.         s->current_picture.motion_val[0][xy + v->blocks_off][0] = s->mv[0][0][0];

  2064.         s->current_picture.motion_val[0][xy + v->blocks_off][1] = s->mv[0][0][1];

  2065.         s->current_picture.motion_val[1][xy + v->blocks_off][0] = s->mv[1][0][0];

  2066.         s->current_picture.motion_val[1][xy + v->blocks_off][1] = s->mv[1][0][1];

  2067.         return;

  2068.     }

  2069. 

  2070.     if ((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2071.         C   = s->current_picture.motion_val[0][xy - 2];

  2072.         A   = s->current_picture.motion_val[0][xy - wrap * 2];

  2073.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2074.         B   = s->current_picture.motion_val[0][xy - wrap * 2 + off];

  2075. 

  2076.         if (!s->mb_x) C[0] = C[1] = 0;

  2077.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2078.             if (s->mb_width == 1) {

  2079.                 px = A[0];

  2080.                 py = A[1];

  2081.             } else {

  2082.                 px = mid_pred(A[0], B[0], C[0]);

  2083.                 py = mid_pred(A[1], B[1], C[1]);

  2084.             }

  2085.         } else if (s->mb_x) { // predictor C is not out of bounds

  2086.             px = C[0];

  2087.             py = C[1];

  2088.         } else {

  2089.             px = py = 0;

  2090.         }

  2091.         /* Pullback MV as specified in 8.3.5.3.4 */

  2092.         {

  2093.             int qx, qy, X, Y;

  2094.             if (v->profile < PROFILE_ADVANCED) {

  2095.                 qx = (s->mb_x << 5);

  2096.                 qy = (s->mb_y << 5);

  2097.                 X  = (s->mb_width  << 5) - 4;

  2098.                 Y  = (s->mb_height << 5) - 4;

  2099.                 if (qx + px < -28) px = -28 - qx;

  2100.                 if (qy + py < -28) py = -28 - qy;

  2101.                 if (qx + px > X) px = X - qx;

  2102.                 if (qy + py > Y) py = Y - qy;

  2103.             } else {

  2104.                 qx = (s->mb_x << 6);

  2105.                 qy = (s->mb_y << 6);

  2106.                 X  = (s->mb_width  << 6) - 4;

  2107.                 Y  = (s->mb_height << 6) - 4;

  2108.                 if (qx + px < -60) px = -60 - qx;

  2109.                 if (qy + py < -60) py = -60 - qy;

  2110.                 if (qx + px > X) px = X - qx;

  2111.                 if (qy + py > Y) py = Y - qy;

  2112.             }

  2113.         }

  2114.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2115.         if (0 && !s->first_slice_line && s->mb_x) {

  2116.             if (is_intra[xy - wrap])

  2117.                 sum = FFABS(px) + FFABS(py);

  2118.             else

  2119.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2120.             if (sum > 32) {

  2121.                 if (get_bits1(&s->gb)) {

  2122.                     px = A[0];

  2123.                     py = A[1];

  2124.                 } else {

  2125.                     px = C[0];

  2126.                     py = C[1];

  2127.                 }

  2128.             } else {

  2129.                 if (is_intra[xy - 2])

  2130.                     sum = FFABS(px) + FFABS(py);

  2131.                 else

  2132.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2133.                 if (sum > 32) {

  2134.                     if (get_bits1(&s->gb)) {

  2135.                         px = A[0];

  2136.                         py = A[1];

  2137.                     } else {

  2138.                         px = C[0];

  2139.                         py = C[1];

  2140.                     }

  2141.                 }

  2142.             }

  2143.         }

  2144.         /* store MV using signed modulus of MV range defined in 4.11 */

  2145.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2146.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2147.     }

  2148.     if ((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2149.         C   = s->current_picture.motion_val[1][xy - 2];

  2150.         A   = s->current_picture.motion_val[1][xy - wrap * 2];

  2151.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2152.         B   = s->current_picture.motion_val[1][xy - wrap * 2 + off];

  2153. 

  2154.         if (!s->mb_x)

  2155.             C[0] = C[1] = 0;

  2156.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2157.             if (s->mb_width == 1) {

  2158.                 px = A[0];

  2159.                 py = A[1];

  2160.             } else {

  2161.                 px = mid_pred(A[0], B[0], C[0]);

  2162.                 py = mid_pred(A[1], B[1], C[1]);

  2163.             }

  2164.         } else if (s->mb_x) { // predictor C is not out of bounds

  2165.             px = C[0];

  2166.             py = C[1];

  2167.         } else {

  2168.             px = py = 0;

  2169.         }

  2170.         /* Pullback MV as specified in 8.3.5.3.4 */

  2171.         {

  2172.             int qx, qy, X, Y;

  2173.             if (v->profile < PROFILE_ADVANCED) {

  2174.                 qx = (s->mb_x << 5);

  2175.                 qy = (s->mb_y << 5);

  2176.                 X  = (s->mb_width  << 5) - 4;

  2177.                 Y  = (s->mb_height << 5) - 4;

  2178.                 if (qx + px < -28) px = -28 - qx;

  2179.                 if (qy + py < -28) py = -28 - qy;

  2180.                 if (qx + px > X) px = X - qx;

  2181.                 if (qy + py > Y) py = Y - qy;

  2182.             } else {

  2183.                 qx = (s->mb_x << 6);

  2184.                 qy = (s->mb_y << 6);

  2185.                 X  = (s->mb_width  << 6) - 4;

  2186.                 Y  = (s->mb_height << 6) - 4;

  2187.                 if (qx + px < -60) px = -60 - qx;

  2188.                 if (qy + py < -60) py = -60 - qy;

  2189.                 if (qx + px > X) px = X - qx;

  2190.                 if (qy + py > Y) py = Y - qy;

  2191.             }

  2192.         }

  2193.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2194.         if (0 && !s->first_slice_line && s->mb_x) {

  2195.             if (is_intra[xy - wrap])

  2196.                 sum = FFABS(px) + FFABS(py);

  2197.             else

  2198.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2199.             if (sum > 32) {

  2200.                 if (get_bits1(&s->gb)) {

  2201.                     px = A[0];

  2202.                     py = A[1];

  2203.                 } else {

  2204.                     px = C[0];

  2205.                     py = C[1];

  2206.                 }

  2207.             } else {

  2208.                 if (is_intra[xy - 2])

  2209.                     sum = FFABS(px) + FFABS(py);

  2210.                 else

  2211.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2212.                 if (sum > 32) {

  2213.                     if (get_bits1(&s->gb)) {

  2214.                         px = A[0];

  2215.                         py = A[1];

  2216.                     } else {

  2217.                         px = C[0];

  2218.                         py = C[1];

  2219.                     }

  2220.                 }

  2221.             }

  2222.         }

  2223.         /* store MV using signed modulus of MV range defined in 4.11 */

  2224. 

  2225.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2226.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2227.     }

  2228.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2229.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2230.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2231.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2232. }

  2233. 

  2234. static inline void vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y, int mv1, int *pred_flag)

  2235. {

  2236.     int dir = (v->bmvtype == BMV_TYPE_BACKWARD) ? 1 : 0;

  2237.     MpegEncContext *s = &v->s;

  2238.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2239. 

  2240.     if (v->bmvtype == BMV_TYPE_DIRECT) {

  2241.         int total_opp, k, f;

  2242.         if (s->next_picture.mb_type[mb_pos + v->mb_off] != MB_TYPE_INTRA) {

  2243.             s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2244.                                       v->bfraction, 0, s->quarter_sample);

  2245.             s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2246.                                       v->bfraction, 0, s->quarter_sample);

  2247.             s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2248.                                       v->bfraction, 1, s->quarter_sample);

  2249.             s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2250.                                       v->bfraction, 1, s->quarter_sample);

  2251. 

  2252.             total_opp = v->mv_f_next[0][s->block_index[0] + v->blocks_off]

  2253.                       + v->mv_f_next[0][s->block_index[1] + v->blocks_off]

  2254.                       + v->mv_f_next[0][s->block_index[2] + v->blocks_off]

  2255.                       + v->mv_f_next[0][s->block_index[3] + v->blocks_off];

  2256.             f = (total_opp > 2) ? 1 : 0;

  2257.         } else {

  2258.             s->mv[0][0][0] = s->mv[0][0][1] = 0;

  2259.             s->mv[1][0][0] = s->mv[1][0][1] = 0;

  2260.             f = 0;

  2261.         }

  2262.         v->ref_field_type[0] = v->ref_field_type[1] = v->cur_field_type ^ f;

  2263.         for (k = 0; k < 4; k++) {

  2264.             s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][0] = s->mv[0][0][0];

  2265.             s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][1] = s->mv[0][0][1];

  2266.             s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][0] = s->mv[1][0][0];

  2267.             s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][1] = s->mv[1][0][1];

  2268.             v->mv_f[0][s->block_index[k] + v->blocks_off] = f;

  2269.             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;

  2270.         }

  2271.         return;

  2272.     }

  2273.     if (v->bmvtype == BMV_TYPE_INTERPOLATED) {

  2274.         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);

  2275.         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);

  2276.         return;

  2277.     }

  2278.     if (dir) { // backward

  2279.         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);

  2280.         if (n == 3 || mv1) {

  2281.             vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0],   1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  2282.         }

  2283.     } else { // forward

  2284.         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);

  2285.         if (n == 3 || mv1) {

  2286.             vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1],   1, v->range_x, v->range_y, v->mb_type[0], 0, 1);

  2287.         }

  2288.     }

  2289. }

  2290. 

  2291. /** Get predicted DC value for I-frames only

  2292.  * prediction dir: left=0, top=1

  2293.  * @param s MpegEncContext

  2294.  * @param overlap flag indicating that overlap filtering is used

  2295.  * @param pq integer part of picture quantizer

  2296.  * @param[in] n block index in the current MB

  2297.  * @param dc_val_ptr Pointer to DC predictor

  2298.  * @param dir_ptr Prediction direction for use in AC prediction

  2299.  */

  2300. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2301.                                 int16_t **dc_val_ptr, int *dir_ptr)

  2302. {

  2303.     int a, b, c, wrap, pred, scale;

  2304.     int16_t *dc_val;

  2305.     static const uint16_t dcpred[32] = {

  2306.         -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2307.              114,  102,   93,   85,   79,   73,   68,   64,

  2308.               60,   57,   54,   51,   49,   47,   45,   43,

  2309.               41,   39,   38,   37,   35,   34,   33

  2310.     };

  2311. 

  2312.     /* find prediction - wmv3_dc_scale always used here in fact */

  2313.     if (n < 4) scale = s->y_dc_scale;

  2314.     else       scale = s->c_dc_scale;

  2315. 

  2316.     wrap   = s->block_wrap[n];

  2317.     dc_val = s->dc_val[0] + s->block_index[n];

  2318. 

  2319.     /* B A

  2320.      * C X

  2321.      */

  2322.     c = dc_val[ - 1];

  2323.     b = dc_val[ - 1 - wrap];

  2324.     a = dc_val[ - wrap];

  2325. 

  2326.     if (pq < 9 || !overlap) {

  2327.         /* Set outer values */

  2328.         if (s->first_slice_line && (n != 2 && n != 3))

  2329.             b = a = dcpred[scale];

  2330.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2331.             b = c = dcpred[scale];

  2332.     } else {

  2333.         /* Set outer values */

  2334.         if (s->first_slice_line && (n != 2 && n != 3))

  2335.             b = a = 0;

  2336.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2337.             b = c = 0;

  2338.     }

  2339. 

  2340.     if (abs(a - b) <= abs(b - c)) {

  2341.         pred     = c;

  2342.         *dir_ptr = 1; // left

  2343.     } else {

  2344.         pred     = a;

  2345.         *dir_ptr = 0; // top

  2346.     }

  2347. 

  2348.     /* update predictor */

  2349.     *dc_val_ptr = &dc_val[0];

  2350.     return pred;

  2351. }

  2352. 

  2353. 

  2354. /** Get predicted DC value

  2355.  * prediction dir: left=0, top=1

  2356.  * @param s MpegEncContext

  2357.  * @param overlap flag indicating that overlap filtering is used

  2358.  * @param pq integer part of picture quantizer

  2359.  * @param[in] n block index in the current MB

  2360.  * @param a_avail flag indicating top block availability

  2361.  * @param c_avail flag indicating left block availability

  2362.  * @param dc_val_ptr Pointer to DC predictor

  2363.  * @param dir_ptr Prediction direction for use in AC prediction

  2364.  */

  2365. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2366.                               int a_avail, int c_avail,

  2367.                               int16_t **dc_val_ptr, int *dir_ptr)

  2368. {

  2369.     int a, b, c, wrap, pred;

  2370.     int16_t *dc_val;

  2371.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2372.     int q1, q2 = 0;

  2373.     int dqscale_index;

  2374. 

  2375.     wrap = s->block_wrap[n];

  2376.     dc_val = s->dc_val[0] + s->block_index[n];

  2377. 

  2378.     /* B A

  2379.      * C X

  2380.      */

  2381.     c = dc_val[ - 1];

  2382.     b = dc_val[ - 1 - wrap];

  2383.     a = dc_val[ - wrap];

  2384.     /* scale predictors if needed */

  2385.     q1 = s->current_picture.qscale_table[mb_pos];

  2386.     dqscale_index = s->y_dc_scale_table[q1] - 1;

  2387.     if (dqscale_index < 0)

  2388.         return 0;

  2389.     if (c_avail && (n != 1 && n != 3)) {

  2390.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2391.         if (q2 && q2 != q1)

  2392.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2393.     }

  2394.     if (a_avail && (n != 2 && n != 3)) {

  2395.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2396.         if (q2 && q2 != q1)

  2397.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2398.     }

  2399.     if (a_avail && c_avail && (n != 3)) {

  2400.         int off = mb_pos;

  2401.         if (n != 1)

  2402.             off--;

  2403.         if (n != 2)

  2404.             off -= s->mb_stride;

  2405.         q2 = s->current_picture.qscale_table[off];

  2406.         if (q2 && q2 != q1)

  2407.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2408.     }

  2409. 

  2410.     if (a_avail && c_avail) {

  2411.         if (abs(a - b) <= abs(b - c)) {

  2412.             pred     = c;

  2413.             *dir_ptr = 1; // left

  2414.         } else {

  2415.             pred     = a;

  2416.             *dir_ptr = 0; // top

  2417.         }

  2418.     } else if (a_avail) {

  2419.         pred     = a;

  2420.         *dir_ptr = 0; // top

  2421.     } else if (c_avail) {

  2422.         pred     = c;

  2423.         *dir_ptr = 1; // left

  2424.     } else {

  2425.         pred     = 0;

  2426.         *dir_ptr = 1; // left

  2427.     }

  2428. 

  2429.     /* update predictor */

  2430.     *dc_val_ptr = &dc_val[0];

  2431.     return pred;

  2432. }

  2433. 

  2434. /** @} */ // Block group

  2435. 

  2436. /**

  2437.  * @name VC1 Macroblock-level functions in Simple/Main Profiles

  2438.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2439.  * @{

  2440.  */

  2441. 

  2442. static inline int vc1_coded_block_pred(MpegEncContext * s, int n,

  2443.                                        uint8_t **coded_block_ptr)

  2444. {

  2445.     int xy, wrap, pred, a, b, c;

  2446. 

  2447.     xy   = s->block_index[n];

  2448.     wrap = s->b8_stride;

  2449. 

  2450.     /* B C

  2451.      * A X

  2452.      */

  2453.     a = s->coded_block[xy - 1       ];

  2454.     b = s->coded_block[xy - 1 - wrap];

  2455.     c = s->coded_block[xy     - wrap];

  2456. 

  2457.     if (b == c) {

  2458.         pred = a;

  2459.     } else {

  2460.         pred = c;

  2461.     }

  2462. 

  2463.     /* store value */

  2464.     *coded_block_ptr = &s->coded_block[xy];

  2465. 

  2466.     return pred;

  2467. }

  2468. 

  2469. /**

  2470.  * Decode one AC coefficient

  2471.  * @param v The VC1 context

  2472.  * @param last Last coefficient

  2473.  * @param skip How much zero coefficients to skip

  2474.  * @param value Decoded AC coefficient value

  2475.  * @param codingset set of VLC to decode data

  2476.  * @see 8.1.3.4

  2477.  */

  2478. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,

  2479.                                 int *value, int codingset)

  2480. {

  2481.     GetBitContext *gb = &v->s.gb;

  2482.     int index, escape, run = 0, level = 0, lst = 0;

  2483. 

  2484.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2485.     if (index != ff_vc1_ac_sizes[codingset] - 1) {

  2486.         run   = vc1_index_decode_table[codingset][index][0];

  2487.         level = vc1_index_decode_table[codingset][index][1];

  2488.         lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;

  2489.         if (get_bits1(gb))

  2490.             level = -level;

  2491.     } else {

  2492.         escape = decode210(gb);

  2493.         if (escape != 2) {

  2494.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2495.             run   = vc1_index_decode_table[codingset][index][0];

  2496.             level = vc1_index_decode_table[codingset][index][1];

  2497.             lst   = index >= vc1_last_decode_table[codingset];

  2498.             if (escape == 0) {

  2499.                 if (lst)

  2500.                     level += vc1_last_delta_level_table[codingset][run];

  2501.                 else

  2502.                     level += vc1_delta_level_table[codingset][run];

  2503.             } else {

  2504.                 if (lst)

  2505.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2506.                 else

  2507.                     run += vc1_delta_run_table[codingset][level] + 1;

  2508.             }

  2509.             if (get_bits1(gb))

  2510.                 level = -level;

  2511.         } else {

  2512.             int sign;

  2513.             lst = get_bits1(gb);

  2514.             if (v->s.esc3_level_length == 0) {

  2515.                 if (v->pq < 8 || v->dquantfrm) { // table 59

  2516.                     v->s.esc3_level_length = get_bits(gb, 3);

  2517.                     if (!v->s.esc3_level_length)

  2518.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2519.                 } else { // table 60

  2520.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  2521.                 }

  2522.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2523.             }

  2524.             run   = get_bits(gb, v->s.esc3_run_length);

  2525.             sign  = get_bits1(gb);

  2526.             level = get_bits(gb, v->s.esc3_level_length);

  2527.             if (sign)

  2528.                 level = -level;

  2529.         }

  2530.     }

  2531. 

  2532.     *last  = lst;

  2533.     *skip  = run;

  2534.     *value = level;

  2535. }

  2536. 

  2537. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2538.  * @param v VC1Context

  2539.  * @param block block to decode

  2540.  * @param[in] n subblock index

  2541.  * @param coded are AC coeffs present or not

  2542.  * @param codingset set of VLC to decode data

  2543.  */

  2544. static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,

  2545.                               int coded, int codingset)

  2546. {

  2547.     GetBitContext *gb = &v->s.gb;

  2548.     MpegEncContext *s = &v->s;

  2549.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2550.     int i;

  2551.     int16_t *dc_val;

  2552.     int16_t *ac_val, *ac_val2;

  2553.     int dcdiff;

  2554. 

  2555.     /* Get DC differential */

  2556.     if (n < 4) {

  2557.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2558.     } else {

  2559.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2560.     }

  2561.     if (dcdiff < 0) {

  2562.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2563.         return -1;

  2564.     }

  2565.     if (dcdiff) {

  2566.         if (dcdiff == 119 /* ESC index value */) {

  2567.             /* TODO: Optimize */

  2568.             if (v->pq == 1)      dcdiff = get_bits(gb, 10);

  2569.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2570.             else                 dcdiff = get_bits(gb, 8);

  2571.         } else {

  2572.             if (v->pq == 1)

  2573.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2574.             else if (v->pq == 2)

  2575.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2576.         }

  2577.         if (get_bits1(gb))

  2578.             dcdiff = -dcdiff;

  2579.     }

  2580. 

  2581.     /* Prediction */

  2582.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2583.     *dc_val = dcdiff;

  2584. 

  2585.     /* Store the quantized DC coeff, used for prediction */

  2586.     if (n < 4) {

  2587.         block[0] = dcdiff * s->y_dc_scale;

  2588.     } else {

  2589.         block[0] = dcdiff * s->c_dc_scale;

  2590.     }

  2591.     /* Skip ? */

  2592.     if (!coded) {

  2593.         goto not_coded;

  2594.     }

  2595. 

  2596.     // AC Decoding

  2597.     i = 1;

  2598. 

  2599.     {

  2600.         int last = 0, skip, value;

  2601.         const uint8_t *zz_table;

  2602.         int scale;

  2603.         int k;

  2604. 

  2605.         scale = v->pq * 2 + v->halfpq;

  2606. 

  2607.         if (v->s.ac_pred) {

  2608.             if (!dc_pred_dir)

  2609.                 zz_table = v->zz_8x8[2];

  2610.             else

  2611.                 zz_table = v->zz_8x8[3];

  2612.         } else

  2613.             zz_table = v->zz_8x8[1];

  2614. 

  2615.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2616.         ac_val2 = ac_val;

  2617.         if (dc_pred_dir) // left

  2618.             ac_val -= 16;

  2619.         else // top

  2620.             ac_val -= 16 * s->block_wrap[n];

  2621. 

  2622.         while (!last) {

  2623.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2624.             i += skip;

  2625.             if (i > 63)

  2626.                 break;

  2627.             block[zz_table[i++]] = value;

  2628.         }

  2629. 

  2630.         /* apply AC prediction if needed */

  2631.         if (s->ac_pred) {

  2632.             if (dc_pred_dir) { // left

  2633.                 for (k = 1; k < 8; k++)

  2634.                     block[k << v->left_blk_sh] += ac_val[k];

  2635.             } else { // top

  2636.                 for (k = 1; k < 8; k++)

  2637.                     block[k << v->top_blk_sh] += ac_val[k + 8];

  2638.             }

  2639.         }

  2640.         /* save AC coeffs for further prediction */

  2641.         for (k = 1; k < 8; k++) {

  2642.             ac_val2[k]     = block[k << v->left_blk_sh];

  2643.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2644.         }

  2645. 

  2646.         /* scale AC coeffs */

  2647.         for (k = 1; k < 64; k++)

  2648.             if (block[k]) {

  2649.                 block[k] *= scale;

  2650.                 if (!v->pquantizer)

  2651.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2652.             }

  2653. 

  2654.         if (s->ac_pred) i = 63;

  2655.     }

  2656. 

  2657. not_coded:

  2658.     if (!coded) {

  2659.         int k, scale;

  2660.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2661.         ac_val2 = ac_val;

  2662. 

  2663.         i = 0;

  2664.         scale = v->pq * 2 + v->halfpq;

  2665.         memset(ac_val2, 0, 16 * 2);

  2666.         if (dc_pred_dir) { // left

  2667.             ac_val -= 16;

  2668.             if (s->ac_pred)

  2669.                 memcpy(ac_val2, ac_val, 8 * 2);

  2670.         } else { // top

  2671.             ac_val -= 16 * s->block_wrap[n];

  2672.             if (s->ac_pred)

  2673.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2674.         }

  2675. 

  2676.         /* apply AC prediction if needed */

  2677.         if (s->ac_pred) {

  2678.             if (dc_pred_dir) { //left

  2679.                 for (k = 1; k < 8; k++) {

  2680.                     block[k << v->left_blk_sh] = ac_val[k] * scale;

  2681.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2682.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -v->pq : v->pq;

  2683.                 }

  2684.             } else { // top

  2685.                 for (k = 1; k < 8; k++) {

  2686.                     block[k << v->top_blk_sh] = ac_val[k + 8] * scale;

  2687.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2688.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -v->pq : v->pq;

  2689.                 }

  2690.             }

  2691.             i = 63;

  2692.         }

  2693.     }

  2694.     s->block_last_index[n] = i;

  2695. 

  2696.     return 0;

  2697. }

  2698. 

  2699. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2700.  * @param v VC1Context

  2701.  * @param block block to decode

  2702.  * @param[in] n subblock number

  2703.  * @param coded are AC coeffs present or not

  2704.  * @param codingset set of VLC to decode data

  2705.  * @param mquant quantizer value for this macroblock

  2706.  */

  2707. static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,

  2708.                                   int coded, int codingset, int mquant)

  2709. {

  2710.     GetBitContext *gb = &v->s.gb;

  2711.     MpegEncContext *s = &v->s;

  2712.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2713.     int i;

  2714.     int16_t *dc_val;

  2715.     int16_t *ac_val, *ac_val2;

  2716.     int dcdiff;

  2717.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2718.     int use_pred = s->ac_pred;

  2719.     int scale;

  2720.     int q1, q2 = 0;

  2721.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2722. 

  2723.     /* Get DC differential */

  2724.     if (n < 4) {

  2725.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2726.     } else {

  2727.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2728.     }

  2729.     if (dcdiff < 0) {

  2730.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2731.         return -1;

  2732.     }

  2733.     if (dcdiff) {

  2734.         if (dcdiff == 119 /* ESC index value */) {

  2735.             /* TODO: Optimize */

  2736.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  2737.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2738.             else                  dcdiff = get_bits(gb, 8);

  2739.         } else {

  2740.             if (mquant == 1)

  2741.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2742.             else if (mquant == 2)

  2743.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2744.         }

  2745.         if (get_bits1(gb))

  2746.             dcdiff = -dcdiff;

  2747.     }

  2748. 

  2749.     /* Prediction */

  2750.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2751.     *dc_val = dcdiff;

  2752. 

  2753.     /* Store the quantized DC coeff, used for prediction */

  2754.     if (n < 4) {

  2755.         block[0] = dcdiff * s->y_dc_scale;

  2756.     } else {

  2757.         block[0] = dcdiff * s->c_dc_scale;

  2758.     }

  2759. 

  2760.     //AC Decoding

  2761.     i = 1;

  2762. 

  2763.     /* check if AC is needed at all */

  2764.     if (!a_avail && !c_avail)

  2765.         use_pred = 0;

  2766.     ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2767.     ac_val2 = ac_val;

  2768. 

  2769.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  2770. 

  2771.     if (dc_pred_dir) // left

  2772.         ac_val -= 16;

  2773.     else // top

  2774.         ac_val -= 16 * s->block_wrap[n];

  2775. 

  2776.     q1 = s->current_picture.qscale_table[mb_pos];

  2777.     if ( dc_pred_dir && c_avail && mb_pos)

  2778.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2779.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  2780.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2781.     if ( dc_pred_dir && n == 1)

  2782.         q2 = q1;

  2783.     if (!dc_pred_dir && n == 2)

  2784.         q2 = q1;

  2785.     if (n == 3)

  2786.         q2 = q1;

  2787. 

  2788.     if (coded) {

  2789.         int last = 0, skip, value;

  2790.         const uint8_t *zz_table;

  2791.         int k;

  2792. 

  2793.         if (v->s.ac_pred) {

  2794.             if (!use_pred && v->fcm == ILACE_FRAME) {

  2795.                 zz_table = v->zzi_8x8;

  2796.             } else {

  2797.                 if (!dc_pred_dir) // top

  2798.                     zz_table = v->zz_8x8[2];

  2799.                 else // left

  2800.                     zz_table = v->zz_8x8[3];

  2801.             }

  2802.         } else {

  2803.             if (v->fcm != ILACE_FRAME)

  2804.                 zz_table = v->zz_8x8[1];

  2805.             else

  2806.                 zz_table = v->zzi_8x8;

  2807.         }

  2808. 

  2809.         while (!last) {

  2810.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2811.             i += skip;

  2812.             if (i > 63)

  2813.                 break;

  2814.             block[zz_table[i++]] = value;

  2815.         }

  2816. 

  2817.         /* apply AC prediction if needed */

  2818.         if (use_pred) {

  2819.             /* scale predictors if needed*/

  2820.             if (q2 && q1 != q2) {

  2821.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2822.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2823. 

  2824.                 if (q1 < 1)

  2825.                     return AVERROR_INVALIDDATA;

  2826.                 if (dc_pred_dir) { // left

  2827.                     for (k = 1; k < 8; k++)

  2828.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2829.                 } else { // top

  2830.                     for (k = 1; k < 8; k++)

  2831.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2832.                 }

  2833.             } else {

  2834.                 if (dc_pred_dir) { //left

  2835.                     for (k = 1; k < 8; k++)

  2836.                         block[k << v->left_blk_sh] += ac_val[k];

  2837.                 } else { //top

  2838.                     for (k = 1; k < 8; k++)

  2839.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  2840.                 }

  2841.             }

  2842.         }

  2843.         /* save AC coeffs for further prediction */

  2844.         for (k = 1; k < 8; k++) {

  2845.             ac_val2[k    ] = block[k << v->left_blk_sh];

  2846.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2847.         }

  2848. 

  2849.         /* scale AC coeffs */

  2850.         for (k = 1; k < 64; k++)

  2851.             if (block[k]) {

  2852.                 block[k] *= scale;

  2853.                 if (!v->pquantizer)

  2854.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2855.             }

  2856. 

  2857.         if (use_pred) i = 63;

  2858.     } else { // no AC coeffs

  2859.         int k;

  2860. 

  2861.         memset(ac_val2, 0, 16 * 2);

  2862.         if (dc_pred_dir) { // left

  2863.             if (use_pred) {

  2864.                 memcpy(ac_val2, ac_val, 8 * 2);

  2865.                 if (q2 && q1 != q2) {

  2866.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2867.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2868.                     if (q1 < 1)

  2869.                         return AVERROR_INVALIDDATA;

  2870.                     for (k = 1; k < 8; k++)

  2871.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2872.                 }

  2873.             }

  2874.         } else { // top

  2875.             if (use_pred) {

  2876.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2877.                 if (q2 && q1 != q2) {

  2878.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2879.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2880.                     if (q1 < 1)

  2881.                         return AVERROR_INVALIDDATA;

  2882.                     for (k = 1; k < 8; k++)

  2883.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2884.                 }

  2885.             }

  2886.         }

  2887. 

  2888.         /* apply AC prediction if needed */

  2889.         if (use_pred) {

  2890.             if (dc_pred_dir) { // left

  2891.                 for (k = 1; k < 8; k++) {

  2892.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  2893.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2894.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  2895.                 }

  2896.             } else { // top

  2897.                 for (k = 1; k < 8; k++) {

  2898.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  2899.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2900.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  2901.                 }

  2902.             }

  2903.             i = 63;

  2904.         }

  2905.     }

  2906.     s->block_last_index[n] = i;

  2907. 

  2908.     return 0;

  2909. }

  2910. 

  2911. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2912.  * @param v VC1Context

  2913.  * @param block block to decode

  2914.  * @param[in] n subblock index

  2915.  * @param coded are AC coeffs present or not

  2916.  * @param mquant block quantizer

  2917.  * @param codingset set of VLC to decode data

  2918.  */

  2919. static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,

  2920.                                   int coded, int mquant, int codingset)

  2921. {

  2922.     GetBitContext *gb = &v->s.gb;

  2923.     MpegEncContext *s = &v->s;

  2924.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2925.     int i;

  2926.     int16_t *dc_val;

  2927.     int16_t *ac_val, *ac_val2;

  2928.     int dcdiff;

  2929.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2930.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2931.     int use_pred = s->ac_pred;

  2932.     int scale;

  2933.     int q1, q2 = 0;

  2934. 

  2935.     s->dsp.clear_block(block);

  2936. 

  2937.     /* XXX: Guard against dumb values of mquant */

  2938.     mquant = (mquant < 1) ? 0 : ((mquant > 31) ? 31 : mquant);

  2939. 

  2940.     /* Set DC scale - y and c use the same */

  2941.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2942.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2943. 

  2944.     /* Get DC differential */

  2945.     if (n < 4) {

  2946.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2947.     } else {

  2948.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2949.     }

  2950.     if (dcdiff < 0) {

  2951.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2952.         return -1;

  2953.     }

  2954.     if (dcdiff) {

  2955.         if (dcdiff == 119 /* ESC index value */) {

  2956.             /* TODO: Optimize */

  2957.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  2958.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2959.             else                  dcdiff = get_bits(gb, 8);

  2960.         } else {

  2961.             if (mquant == 1)

  2962.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2963.             else if (mquant == 2)

  2964.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2965.         }

  2966.         if (get_bits1(gb))

  2967.             dcdiff = -dcdiff;

  2968.     }

  2969. 

  2970.     /* Prediction */

  2971.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2972.     *dc_val = dcdiff;

  2973. 

  2974.     /* Store the quantized DC coeff, used for prediction */

  2975. 

  2976.     if (n < 4) {

  2977.         block[0] = dcdiff * s->y_dc_scale;

  2978.     } else {

  2979.         block[0] = dcdiff * s->c_dc_scale;

  2980.     }

  2981. 

  2982.     //AC Decoding

  2983.     i = 1;

  2984. 

  2985.     /* check if AC is needed at all and adjust direction if needed */

  2986.     if (!a_avail) dc_pred_dir = 1;

  2987.     if (!c_avail) dc_pred_dir = 0;

  2988.     if (!a_avail && !c_avail) use_pred = 0;

  2989.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2990.     ac_val2 = ac_val;

  2991. 

  2992.     scale = mquant * 2 + v->halfpq;

  2993. 

  2994.     if (dc_pred_dir) //left

  2995.         ac_val -= 16;

  2996.     else //top

  2997.         ac_val -= 16 * s->block_wrap[n];

  2998. 

  2999.     q1 = s->current_picture.qscale_table[mb_pos];

  3000.     if (dc_pred_dir && c_avail && mb_pos)

  3001.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  3002.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  3003.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  3004.     if ( dc_pred_dir && n == 1)

  3005.         q2 = q1;

  3006.     if (!dc_pred_dir && n == 2)

  3007.         q2 = q1;

  3008.     if (n == 3) q2 = q1;

  3009. 

  3010.     if (coded) {

  3011.         int last = 0, skip, value;

  3012.         int k;

  3013. 

  3014.         while (!last) {

  3015.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  3016.             i += skip;

  3017.             if (i > 63)

  3018.                 break;

  3019.             if (v->fcm == PROGRESSIVE)

  3020.                 block[v->zz_8x8[0][i++]] = value;

  3021.             else {

  3022.                 if (use_pred && (v->fcm == ILACE_FRAME)) {

  3023.                     if (!dc_pred_dir) // top

  3024.                         block[v->zz_8x8[2][i++]] = value;

  3025.                     else // left

  3026.                         block[v->zz_8x8[3][i++]] = value;

  3027.                 } else {

  3028.                     block[v->zzi_8x8[i++]] = value;

  3029.                 }

  3030.             }

  3031.         }

  3032. 

  3033.         /* apply AC prediction if needed */

  3034.         if (use_pred) {

  3035.             /* scale predictors if needed*/

  3036.             if (q2 && q1 != q2) {

  3037.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3038.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3039. 

  3040.                 if (q1 < 1)

  3041.                     return AVERROR_INVALIDDATA;

  3042.                 if (dc_pred_dir) { // left

  3043.                     for (k = 1; k < 8; k++)

  3044.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3045.                 } else { //top

  3046.                     for (k = 1; k < 8; k++)

  3047.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3048.                 }

  3049.             } else {

  3050.                 if (dc_pred_dir) { // left

  3051.                     for (k = 1; k < 8; k++)

  3052.                         block[k << v->left_blk_sh] += ac_val[k];

  3053.                 } else { // top

  3054.                     for (k = 1; k < 8; k++)

  3055.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  3056.                 }

  3057.             }

  3058.         }

  3059.         /* save AC coeffs for further prediction */

  3060.         for (k = 1; k < 8; k++) {

  3061.             ac_val2[k    ] = block[k << v->left_blk_sh];

  3062.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  3063.         }

  3064. 

  3065.         /* scale AC coeffs */

  3066.         for (k = 1; k < 64; k++)

  3067.             if (block[k]) {

  3068.                 block[k] *= scale;

  3069.                 if (!v->pquantizer)

  3070.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3071.             }

  3072. 

  3073.         if (use_pred) i = 63;

  3074.     } else { // no AC coeffs

  3075.         int k;

  3076. 

  3077.         memset(ac_val2, 0, 16 * 2);

  3078.         if (dc_pred_dir) { // left

  3079.             if (use_pred) {

  3080.                 memcpy(ac_val2, ac_val, 8 * 2);

  3081.                 if (q2 && q1 != q2) {

  3082.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3083.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3084.                     if (q1 < 1)

  3085.                         return AVERROR_INVALIDDATA;

  3086.                     for (k = 1; k < 8; k++)

  3087.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3088.                 }

  3089.             }

  3090.         } else { // top

  3091.             if (use_pred) {

  3092.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3093.                 if (q2 && q1 != q2) {

  3094.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3095.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3096.                     if (q1 < 1)

  3097.                         return AVERROR_INVALIDDATA;

  3098.                     for (k = 1; k < 8; k++)

  3099.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3100.                 }

  3101.             }

  3102.         }

  3103. 

  3104.         /* apply AC prediction if needed */

  3105.         if (use_pred) {

  3106.             if (dc_pred_dir) { // left

  3107.                 for (k = 1; k < 8; k++) {

  3108.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  3109.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  3110.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  3111.                 }

  3112.             } else { // top

  3113.                 for (k = 1; k < 8; k++) {

  3114.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  3115.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  3116.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  3117.                 }

  3118.             }

  3119.             i = 63;

  3120.         }

  3121.     }

  3122.     s->block_last_index[n] = i;

  3123. 

  3124.     return 0;

  3125. }

  3126. 

  3127. /** Decode P block

  3128.  */

  3129. static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,

  3130.                               int mquant, int ttmb, int first_block,

  3131.                               uint8_t *dst, int linesize, int skip_block,

  3132.                               int *ttmb_out)

  3133. {

  3134.     MpegEncContext *s = &v->s;

  3135.     GetBitContext *gb = &s->gb;

  3136.     int i, j;

  3137.     int subblkpat = 0;

  3138.     int scale, off, idx, last, skip, value;

  3139.     int ttblk = ttmb & 7;

  3140.     int pat = 0;

  3141. 

  3142.     s->dsp.clear_block(block);

  3143. 

  3144.     if (ttmb == -1) {

  3145.         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)];

  3146.     }

  3147.     if (ttblk == TT_4X4) {

  3148.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  3149.     }

  3150.     if ((ttblk != TT_8X8 && ttblk != TT_4X4)

  3151.         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))

  3152.             || (!v->res_rtm_flag && !first_block))) {

  3153.         subblkpat = decode012(gb);

  3154.         if (subblkpat)

  3155.             subblkpat ^= 3; // swap decoded pattern bits

  3156.         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)

  3157.             ttblk = TT_8X4;

  3158.         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)

  3159.             ttblk = TT_4X8;

  3160.     }

  3161.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  3162. 

  3163.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  3164.     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  3165.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  3166.         ttblk     = TT_8X4;

  3167.     }

  3168.     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  3169.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  3170.         ttblk     = TT_4X8;

  3171.     }

  3172.     switch (ttblk) {

  3173.     case TT_8X8:

  3174.         pat  = 0xF;

  3175.         i    = 0;

  3176.         last = 0;

  3177.         while (!last) {

  3178.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3179.             i += skip;

  3180.             if (i > 63)

  3181.                 break;

  3182.             if (!v->fcm)

  3183.                 idx = v->zz_8x8[0][i++];

  3184.             else

  3185.                 idx = v->zzi_8x8[i++];

  3186.             block[idx] = value * scale;

  3187.             if (!v->pquantizer)

  3188.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3189.         }

  3190.         if (!skip_block) {

  3191.             if (i == 1)

  3192.                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);

  3193.             else {

  3194.                 v->vc1dsp.vc1_inv_trans_8x8(block);

  3195.                 s->dsp.add_pixels_clamped(block, dst, linesize);

  3196.             }

  3197.         }

  3198.         break;

  3199.     case TT_4X4:

  3200.         pat = ~subblkpat & 0xF;

  3201.         for (j = 0; j < 4; j++) {

  3202.             last = subblkpat & (1 << (3 - j));

  3203.             i    = 0;

  3204.             off  = (j & 1) * 4 + (j & 2) * 16;

  3205.             while (!last) {

  3206.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3207.                 i += skip;

  3208.                 if (i > 15)

  3209.                     break;

  3210.                 if (!v->fcm)

  3211.                     idx = ff_vc1_simple_progressive_4x4_zz[i++];

  3212.                 else

  3213.                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];

  3214.                 block[idx + off] = value * scale;

  3215.                 if (!v->pquantizer)

  3216.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3217.             }

  3218.             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {

  3219.                 if (i == 1)

  3220.                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);

  3221.                 else

  3222.                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);

  3223.             }

  3224.         }

  3225.         break;

  3226.     case TT_8X4:

  3227.         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;

  3228.         for (j = 0; j < 2; j++) {

  3229.             last = subblkpat & (1 << (1 - j));

  3230.             i    = 0;

  3231.             off  = j * 32;

  3232.             while (!last) {

  3233.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3234.                 i += skip;

  3235.                 if (i > 31)

  3236.                     break;

  3237.                 if (!v->fcm)

  3238.                     idx = v->zz_8x4[i++] + off;

  3239.                 else

  3240.                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;

  3241.                 block[idx] = value * scale;

  3242.                 if (!v->pquantizer)

  3243.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3244.             }

  3245.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3246.                 if (i == 1)

  3247.                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);

  3248.                 else

  3249.                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);

  3250.             }

  3251.         }

  3252.         break;

  3253.     case TT_4X8:

  3254.         pat = ~(subblkpat * 5) & 0xF;

  3255.         for (j = 0; j < 2; j++) {

  3256.             last = subblkpat & (1 << (1 - j));

  3257.             i    = 0;

  3258.             off  = j * 4;

  3259.             while (!last) {

  3260.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3261.                 i += skip;

  3262.                 if (i > 31)

  3263.                     break;

  3264.                 if (!v->fcm)

  3265.                     idx = v->zz_4x8[i++] + off;

  3266.                 else

  3267.                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;

  3268.                 block[idx] = value * scale;

  3269.                 if (!v->pquantizer)

  3270.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3271.             }

  3272.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3273.                 if (i == 1)

  3274.                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);

  3275.                 else

  3276.                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  3277.             }

  3278.         }

  3279.         break;

  3280.     }

  3281.     if (ttmb_out)

  3282.         *ttmb_out |= ttblk << (n * 4);

  3283.     return pat;

  3284. }

  3285. 

  3286. /** @} */ // Macroblock group

  3287. 

  3288. static const int size_table  [6] = { 0, 2, 3, 4,  5,  8 };

  3289. static const int offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3290. 

  3291. static av_always_inline void vc1_apply_p_v_loop_filter(VC1Context *v, int block_num)

  3292. {

  3293.     MpegEncContext *s  = &v->s;

  3294.     int mb_cbp         = v->cbp[s->mb_x - s->mb_stride],

  3295.         block_cbp      = mb_cbp      >> (block_num * 4), bottom_cbp,

  3296.         mb_is_intra    = v->is_intra[s->mb_x - s->mb_stride],

  3297.         block_is_intra = mb_is_intra >> (block_num * 4), bottom_is_intra;

  3298.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3299.     uint8_t *dst;

  3300. 

  3301.     if (block_num > 3) {

  3302.         dst      = s->dest[block_num - 3];

  3303.     } else {

  3304.         dst      = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 8) * linesize;

  3305.     }

  3306.     if (s->mb_y != s->end_mb_y || block_num < 2) {

  3307.         int16_t (*mv)[2];

  3308.         int mv_stride;

  3309. 

  3310.         if (block_num > 3) {

  3311.             bottom_cbp      = v->cbp[s->mb_x]      >> (block_num * 4);

  3312.             bottom_is_intra = v->is_intra[s->mb_x] >> (block_num * 4);

  3313.             mv              = &v->luma_mv[s->mb_x - s->mb_stride];

  3314.             mv_stride       = s->mb_stride;

  3315.         } else {

  3316.             bottom_cbp      = (block_num < 2) ? (mb_cbp               >> ((block_num + 2) * 4))

  3317.                                               : (v->cbp[s->mb_x]      >> ((block_num - 2) * 4));

  3318.             bottom_is_intra = (block_num < 2) ? (mb_is_intra          >> ((block_num + 2) * 4))

  3319.                                               : (v->is_intra[s->mb_x] >> ((block_num - 2) * 4));

  3320.             mv_stride       = s->b8_stride;

  3321.             mv              = &s->current_picture.motion_val[0][s->block_index[block_num] - 2 * mv_stride];

  3322.         }

  3323. 

  3324.         if (bottom_is_intra & 1 || block_is_intra & 1 ||

  3325.             mv[0][0] != mv[mv_stride][0] || mv[0][1] != mv[mv_stride][1]) {

  3326.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3327.         } else {

  3328.             idx = ((bottom_cbp >> 2) | block_cbp) & 3;

  3329.             if (idx == 3) {

  3330.                 v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3331.             } else if (idx) {

  3332.                 if (idx == 1)

  3333.                     v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3334.                 else

  3335.                     v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3336.             }

  3337.         }

  3338.     }

  3339. 

  3340.     dst -= 4 * linesize;

  3341.     ttblk = (v->ttblk[s->mb_x - s->mb_stride] >> (block_num * 4)) & 0xF;

  3342.     if (ttblk == TT_4X4 || ttblk == TT_8X4) {

  3343.         idx = (block_cbp | (block_cbp >> 2)) & 3;

  3344.         if (idx == 3) {

  3345.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3346.         } else if (idx) {

  3347.             if (idx == 1)

  3348.                 v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3349.             else

  3350.                 v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3351.         }

  3352.     }

  3353. }

  3354. 

  3355. static av_always_inline void vc1_apply_p_h_loop_filter(VC1Context *v, int block_num)

  3356. {

  3357.     MpegEncContext *s  = &v->s;

  3358.     int mb_cbp         = v->cbp[s->mb_x - 1 - s->mb_stride],

  3359.         block_cbp      = mb_cbp      >> (block_num * 4), right_cbp,

  3360.         mb_is_intra    = v->is_intra[s->mb_x - 1 - s->mb_stride],

  3361.         block_is_intra = mb_is_intra >> (block_num * 4), right_is_intra;

  3362.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3363.     uint8_t *dst;

  3364. 

  3365.     if (block_num > 3) {

  3366.         dst = s->dest[block_num - 3] - 8 * linesize;

  3367.     } else {

  3368.         dst = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 16) * linesize - 8;

  3369.     }

  3370. 

  3371.     if (s->mb_x != s->mb_width || !(block_num & 5)) {

  3372.         int16_t (*mv)[2];

  3373. 

  3374.         if (block_num > 3) {

  3375.             right_cbp      = v->cbp[s->mb_x - s->mb_stride] >> (block_num * 4);

  3376.             right_is_intra = v->is_intra[s->mb_x - s->mb_stride] >> (block_num * 4);

  3377.             mv             = &v->luma_mv[s->mb_x - s->mb_stride - 1];

  3378.         } else {

  3379.             right_cbp      = (block_num & 1) ? (v->cbp[s->mb_x - s->mb_stride]      >> ((block_num - 1) * 4))

  3380.                                              : (mb_cbp                              >> ((block_num + 1) * 4));

  3381.             right_is_intra = (block_num & 1) ? (v->is_intra[s->mb_x - s->mb_stride] >> ((block_num - 1) * 4))

  3382.                                              : (mb_is_intra                         >> ((block_num + 1) * 4));

  3383.             mv             = &s->current_picture.motion_val[0][s->block_index[block_num] - s->b8_stride * 2 - 2];

  3384.         }

  3385.         if (block_is_intra & 1 || right_is_intra & 1 || mv[0][0] != mv[1][0] || mv[0][1] != mv[1][1]) {

  3386.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3387.         } else {

  3388.             idx = ((right_cbp >> 1) | block_cbp) & 5; // FIXME check

  3389.             if (idx == 5) {

  3390.                 v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3391.             } else if (idx) {

  3392.                 if (idx == 1)

  3393.                     v->vc1dsp.vc1_h_loop_filter4(dst + 4 * linesize, linesize, v->pq);

  3394.                 else

  3395.                     v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3396.             }

  3397.         }

  3398.     }

  3399. 

  3400.     dst -= 4;

  3401.     ttblk = (v->ttblk[s->mb_x - s->mb_stride - 1] >> (block_num * 4)) & 0xf;

  3402.     if (ttblk == TT_4X4 || ttblk == TT_4X8) {

  3403.         idx = (block_cbp | (block_cbp >> 1)) & 5;

  3404.         if (idx == 5) {

  3405.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3406.         } else if (idx) {

  3407.             if (idx == 1)

  3408.                 v->vc1dsp.vc1_h_loop_filter4(dst + linesize * 4, linesize, v->pq);

  3409.             else

  3410.                 v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3411.         }

  3412.     }

  3413. }

  3414. 

  3415. static void vc1_apply_p_loop_filter(VC1Context *v)

  3416. {

  3417.     MpegEncContext *s = &v->s;

  3418.     int i;

  3419. 

  3420.     for (i = 0; i < 6; i++) {

  3421.         vc1_apply_p_v_loop_filter(v, i);

  3422.     }

  3423. 

  3424.     /* V always precedes H, therefore we run H one MB before V;

  3425.      * at the end of a row, we catch up to complete the row */

  3426.     if (s->mb_x) {

  3427.         for (i = 0; i < 6; i++) {

  3428.             vc1_apply_p_h_loop_filter(v, i);

  3429.         }

  3430.         if (s->mb_x == s->mb_width - 1) {

  3431.             s->mb_x++;

  3432.             ff_update_block_index(s);

  3433.             for (i = 0; i < 6; i++) {

  3434.                 vc1_apply_p_h_loop_filter(v, i);

  3435.             }

  3436.         }

  3437.     }

  3438. }

  3439. 

  3440. /** Decode one P-frame MB

  3441.  */

  3442. static int vc1_decode_p_mb(VC1Context *v)

  3443. {

  3444.     MpegEncContext *s = &v->s;

  3445.     GetBitContext *gb = &s->gb;

  3446.     int i, j;

  3447.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3448.     int cbp; /* cbp decoding stuff */

  3449.     int mqdiff, mquant; /* MB quantization */

  3450.     int ttmb = v->ttfrm; /* MB Transform type */

  3451. 

  3452.     int mb_has_coeffs = 1; /* last_flag */

  3453.     int dmv_x, dmv_y; /* Differential MV components */

  3454.     int index, index1; /* LUT indexes */

  3455.     int val, sign; /* temp values */

  3456.     int first_block = 1;

  3457.     int dst_idx, off;

  3458.     int skipped, fourmv;

  3459.     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;

  3460. 

  3461.     mquant = v->pq; /* lossy initialization */

  3462. 

  3463.     if (v->mv_type_is_raw)

  3464.         fourmv = get_bits1(gb);

  3465.     else

  3466.         fourmv = v->mv_type_mb_plane[mb_pos];

  3467.     if (v->skip_is_raw)

  3468.         skipped = get_bits1(gb);

  3469.     else

  3470.         skipped = v->s.mbskip_table[mb_pos];

  3471. 

  3472.     if (!fourmv) { /* 1MV mode */

  3473.         if (!skipped) {

  3474.             GET_MVDATA(dmv_x, dmv_y);

  3475. 

  3476.             if (s->mb_intra) {

  3477.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3478.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3479.             }

  3480.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3481.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3482. 

  3483.             /* FIXME Set DC val for inter block ? */

  3484.             if (s->mb_intra && !mb_has_coeffs) {

  3485.                 GET_MQUANT();

  3486.                 s->ac_pred = get_bits1(gb);

  3487.                 cbp        = 0;

  3488.             } else if (mb_has_coeffs) {

  3489.                 if (s->mb_intra)

  3490.                     s->ac_pred = get_bits1(gb);

  3491.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3492.                 GET_MQUANT();

  3493.             } else {

  3494.                 mquant = v->pq;

  3495.                 cbp    = 0;

  3496.             }

  3497.             s->current_picture.qscale_table[mb_pos] = mquant;

  3498. 

  3499.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3500.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3501.                                 VC1_TTMB_VLC_BITS, 2);

  3502.             if (!s->mb_intra) vc1_mc_1mv(v, 0);

  3503.             dst_idx = 0;

  3504.             for (i = 0; i < 6; i++) {

  3505.                 s->dc_val[0][s->block_index[i]] = 0;

  3506.                 dst_idx += i >> 2;

  3507.                 val = ((cbp >> (5 - i)) & 1);

  3508.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3509.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3510.                 if (s->mb_intra) {

  3511.                     /* check if prediction blocks A and C are available */

  3512.                     v->a_avail = v->c_avail = 0;

  3513.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3514.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3515.                     if (i == 1 || i == 3 || s->mb_x)

  3516.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3517. 

  3518.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3519.                                            (i & 4) ? v->codingset2 : v->codingset);

  3520.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3521.                         continue;

  3522.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3523.                     if (v->rangeredfrm)

  3524.                         for (j = 0; j < 64; j++)

  3525.                             s->block[i][j] <<= 1;

  3526.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3527.                     if (v->pq >= 9 && v->overlap) {

  3528.                         if (v->c_avail)

  3529.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3530.                         if (v->a_avail)

  3531.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3532.                     }

  3533.                     block_cbp   |= 0xF << (i << 2);

  3534.                     block_intra |= 1 << i;

  3535.                 } else if (val) {

  3536.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block,

  3537.                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,

  3538.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3539.                     block_cbp |= pat << (i << 2);

  3540.                     if (!v->ttmbf && ttmb < 8)

  3541.                         ttmb = -1;

  3542.                     first_block = 0;

  3543.                 }

  3544.             }

  3545.         } else { // skipped

  3546.             s->mb_intra = 0;

  3547.             for (i = 0; i < 6; i++) {

  3548.                 v->mb_type[0][s->block_index[i]] = 0;

  3549.                 s->dc_val[0][s->block_index[i]]  = 0;

  3550.             }

  3551.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3552.             s->current_picture.qscale_table[mb_pos] = 0;

  3553.             vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3554.             vc1_mc_1mv(v, 0);

  3555.         }

  3556.     } else { // 4MV mode

  3557.         if (!skipped /* unskipped MB */) {

  3558.             int intra_count = 0, coded_inter = 0;

  3559.             int is_intra[6], is_coded[6];

  3560.             /* Get CBPCY */

  3561.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3562.             for (i = 0; i < 6; i++) {

  3563.                 val = ((cbp >> (5 - i)) & 1);

  3564.                 s->dc_val[0][s->block_index[i]] = 0;

  3565.                 s->mb_intra                     = 0;

  3566.                 if (i < 4) {

  3567.                     dmv_x = dmv_y = 0;

  3568.                     s->mb_intra   = 0;

  3569.                     mb_has_coeffs = 0;

  3570.                     if (val) {

  3571.                         GET_MVDATA(dmv_x, dmv_y);

  3572.                     }

  3573.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3574.                     if (!s->mb_intra)

  3575.                         vc1_mc_4mv_luma(v, i, 0);

  3576.                     intra_count += s->mb_intra;

  3577.                     is_intra[i]  = s->mb_intra;

  3578.                     is_coded[i]  = mb_has_coeffs;

  3579.                 }

  3580.                 if (i & 4) {

  3581.                     is_intra[i] = (intra_count >= 3);

  3582.                     is_coded[i] = val;

  3583.                 }

  3584.                 if (i == 4)

  3585.                     vc1_mc_4mv_chroma(v, 0);

  3586.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3587.                 if (!coded_inter)

  3588.                     coded_inter = !is_intra[i] & is_coded[i];

  3589.             }

  3590.             // if there are no coded blocks then don't do anything more

  3591.             dst_idx = 0;

  3592.             if (!intra_count && !coded_inter)

  3593.                 goto end;

  3594.             GET_MQUANT();

  3595.             s->current_picture.qscale_table[mb_pos] = mquant;

  3596.             /* test if block is intra and has pred */

  3597.             {

  3598.                 int intrapred = 0;

  3599.                 for (i = 0; i < 6; i++)

  3600.                     if (is_intra[i]) {

  3601.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3602.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3603.                             intrapred = 1;

  3604.                             break;

  3605.                         }

  3606.                     }

  3607.                 if (intrapred)

  3608.                     s->ac_pred = get_bits1(gb);

  3609.                 else

  3610.                     s->ac_pred = 0;

  3611.             }

  3612.             if (!v->ttmbf && coded_inter)

  3613.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3614.             for (i = 0; i < 6; i++) {

  3615.                 dst_idx    += i >> 2;

  3616.                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3617.                 s->mb_intra = is_intra[i];

  3618.                 if (is_intra[i]) {

  3619.                     /* check if prediction blocks A and C are available */

  3620.                     v->a_avail = v->c_avail = 0;

  3621.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3622.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3623.                     if (i == 1 || i == 3 || s->mb_x)

  3624.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3625. 

  3626.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant,

  3627.                                            (i & 4) ? v->codingset2 : v->codingset);

  3628.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3629.                         continue;

  3630.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3631.                     if (v->rangeredfrm)

  3632.                         for (j = 0; j < 64; j++)

  3633.                             s->block[i][j] <<= 1;

  3634.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off,

  3635.                                                      (i & 4) ? s->uvlinesize : s->linesize);

  3636.                     if (v->pq >= 9 && v->overlap) {

  3637.                         if (v->c_avail)

  3638.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3639.                         if (v->a_avail)

  3640.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3641.                     }

  3642.                     block_cbp   |= 0xF << (i << 2);

  3643.                     block_intra |= 1 << i;

  3644.                 } else if (is_coded[i]) {

  3645.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3646.                                              first_block, s->dest[dst_idx] + off,

  3647.                                              (i & 4) ? s->uvlinesize : s->linesize,

  3648.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  3649.                                              &block_tt);

  3650.                     block_cbp |= pat << (i << 2);

  3651.                     if (!v->ttmbf && ttmb < 8)

  3652.                         ttmb = -1;

  3653.                     first_block = 0;

  3654.                 }

  3655.             }

  3656.         } else { // skipped MB

  3657.             s->mb_intra                               = 0;

  3658.             s->current_picture.qscale_table[mb_pos] = 0;

  3659.             for (i = 0; i < 6; i++) {

  3660.                 v->mb_type[0][s->block_index[i]] = 0;

  3661.                 s->dc_val[0][s->block_index[i]]  = 0;

  3662.             }

  3663.             for (i = 0; i < 4; i++) {

  3664.                 vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3665.                 vc1_mc_4mv_luma(v, i, 0);

  3666.             }

  3667.             vc1_mc_4mv_chroma(v, 0);

  3668.             s->current_picture.qscale_table[mb_pos] = 0;

  3669.         }

  3670.     }

  3671. end:

  3672.     v->cbp[s->mb_x]      = block_cbp;

  3673.     v->ttblk[s->mb_x]    = block_tt;

  3674.     v->is_intra[s->mb_x] = block_intra;

  3675. 

  3676.     return 0;

  3677. }

  3678. 

  3679. /* Decode one macroblock in an interlaced frame p picture */

  3680. 

  3681. static int vc1_decode_p_mb_intfr(VC1Context *v)

  3682. {

  3683.     MpegEncContext *s = &v->s;

  3684.     GetBitContext *gb = &s->gb;

  3685.     int i;

  3686.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3687.     int cbp = 0; /* cbp decoding stuff */

  3688.     int mqdiff, mquant; /* MB quantization */

  3689.     int ttmb = v->ttfrm; /* MB Transform type */

  3690. 

  3691.     int mb_has_coeffs = 1; /* last_flag */

  3692.     int dmv_x, dmv_y; /* Differential MV components */

  3693.     int val; /* temp value */

  3694.     int first_block = 1;

  3695.     int dst_idx, off;

  3696.     int skipped, fourmv = 0, twomv = 0;

  3697.     int block_cbp = 0, pat, block_tt = 0;

  3698.     int idx_mbmode = 0, mvbp;

  3699.     int stride_y, fieldtx;

  3700. 

  3701.     mquant = v->pq; /* Loosy initialization */

  3702. 

  3703.     if (v->skip_is_raw)

  3704.         skipped = get_bits1(gb);

  3705.     else

  3706.         skipped = v->s.mbskip_table[mb_pos];

  3707.     if (!skipped) {

  3708.         if (v->fourmvswitch)

  3709.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done

  3710.         else

  3711.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line

  3712.         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {

  3713.         /* store the motion vector type in a flag (useful later) */

  3714.         case MV_PMODE_INTFR_4MV:

  3715.             fourmv = 1;

  3716.             v->blk_mv_type[s->block_index[0]] = 0;

  3717.             v->blk_mv_type[s->block_index[1]] = 0;

  3718.             v->blk_mv_type[s->block_index[2]] = 0;

  3719.             v->blk_mv_type[s->block_index[3]] = 0;

  3720.             break;

  3721.         case MV_PMODE_INTFR_4MV_FIELD:

  3722.             fourmv = 1;

  3723.             v->blk_mv_type[s->block_index[0]] = 1;

  3724.             v->blk_mv_type[s->block_index[1]] = 1;

  3725.             v->blk_mv_type[s->block_index[2]] = 1;

  3726.             v->blk_mv_type[s->block_index[3]] = 1;

  3727.             break;

  3728.         case MV_PMODE_INTFR_2MV_FIELD:

  3729.             twomv = 1;

  3730.             v->blk_mv_type[s->block_index[0]] = 1;

  3731.             v->blk_mv_type[s->block_index[1]] = 1;

  3732.             v->blk_mv_type[s->block_index[2]] = 1;

  3733.             v->blk_mv_type[s->block_index[3]] = 1;

  3734.             break;

  3735.         case MV_PMODE_INTFR_1MV:

  3736.             v->blk_mv_type[s->block_index[0]] = 0;

  3737.             v->blk_mv_type[s->block_index[1]] = 0;

  3738.             v->blk_mv_type[s->block_index[2]] = 0;

  3739.             v->blk_mv_type[s->block_index[3]] = 0;

  3740.             break;

  3741.         }

  3742.         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  3743.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3744.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3745.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  3746.             s->mb_intra = v->is_intra[s->mb_x] = 1;

  3747.             for (i = 0; i < 6; i++)

  3748.                 v->mb_type[0][s->block_index[i]] = 1;

  3749.             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  3750.             mb_has_coeffs = get_bits1(gb);

  3751.             if (mb_has_coeffs)

  3752.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3753.             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  3754.             GET_MQUANT();

  3755.             s->current_picture.qscale_table[mb_pos] = mquant;

  3756.             /* Set DC scale - y and c use the same (not sure if necessary here) */

  3757.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3758.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3759.             dst_idx = 0;

  3760.             for (i = 0; i < 6; i++) {

  3761.                 s->dc_val[0][s->block_index[i]] = 0;

  3762.                 dst_idx += i >> 2;

  3763.                 val = ((cbp >> (5 - i)) & 1);

  3764.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3765.                 v->a_avail = v->c_avail = 0;

  3766.                 if (i == 2 || i == 3 || !s->first_slice_line)

  3767.                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3768.                 if (i == 1 || i == 3 || s->mb_x)

  3769.                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3770. 

  3771.                 vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3772.                                        (i & 4) ? v->codingset2 : v->codingset);

  3773.                 if ((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3774.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3775.                 if (i < 4) {

  3776.                     stride_y = s->linesize << fieldtx;

  3777.                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  3778.                 } else {

  3779.                     stride_y = s->uvlinesize;

  3780.                     off = 0;

  3781.                 }

  3782.                 s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, stride_y);

  3783.                 //TODO: loop filter

  3784.             }

  3785. 

  3786.         } else { // inter MB

  3787.             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];

  3788.             if (mb_has_coeffs)

  3789.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3790.             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  3791.                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  3792.             } else {

  3793.                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)

  3794.                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {

  3795.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  3796.                 }

  3797.             }

  3798.             s->mb_intra = v->is_intra[s->mb_x] = 0;

  3799.             for (i = 0; i < 6; i++)

  3800.                 v->mb_type[0][s->block_index[i]] = 0;

  3801.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];

  3802.             /* for all motion vector read MVDATA and motion compensate each block */

  3803.             dst_idx = 0;

  3804.             if (fourmv) {

  3805.                 mvbp = v->fourmvbp;

  3806.                 for (i = 0; i < 6; i++) {

  3807.                     if (i < 4) {

  3808.                         dmv_x = dmv_y = 0;

  3809.                         val   = ((mvbp >> (3 - i)) & 1);

  3810.                         if (val) {

  3811.                             get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3812.                         }

  3813.                         vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3814.                         vc1_mc_4mv_luma(v, i, 0);

  3815.                     } else if (i == 4) {

  3816.                         vc1_mc_4mv_chroma4(v);

  3817.                     }

  3818.                 }

  3819.             } else if (twomv) {

  3820.                 mvbp  = v->twomvbp;

  3821.                 dmv_x = dmv_y = 0;

  3822.                 if (mvbp & 2) {

  3823.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3824.                 }

  3825.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0]);

  3826.                 vc1_mc_4mv_luma(v, 0, 0);

  3827.                 vc1_mc_4mv_luma(v, 1, 0);

  3828.                 dmv_x = dmv_y = 0;

  3829.                 if (mvbp & 1) {

  3830.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3831.                 }

  3832.                 vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0]);

  3833.                 vc1_mc_4mv_luma(v, 2, 0);

  3834.                 vc1_mc_4mv_luma(v, 3, 0);

  3835.                 vc1_mc_4mv_chroma4(v);

  3836.             } else {

  3837.                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];

  3838.                 dmv_x = dmv_y = 0;

  3839.                 if (mvbp) {

  3840.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3841.                 }

  3842.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3843.                 vc1_mc_1mv(v, 0);

  3844.             }

  3845.             if (cbp)

  3846.                 GET_MQUANT();  // p. 227

  3847.             s->current_picture.qscale_table[mb_pos] = mquant;

  3848.             if (!v->ttmbf && cbp)

  3849.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3850.             for (i = 0; i < 6; i++) {

  3851.                 s->dc_val[0][s->block_index[i]] = 0;

  3852.                 dst_idx += i >> 2;

  3853.                 val = ((cbp >> (5 - i)) & 1);

  3854.                 if (!fieldtx)

  3855.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3856.                 else

  3857.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  3858.                 if (val) {

  3859.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3860.                                              first_block, s->dest[dst_idx] + off,

  3861.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  3862.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3863.                     block_cbp |= pat << (i << 2);

  3864.                     if (!v->ttmbf && ttmb < 8)

  3865.                         ttmb = -1;

  3866.                     first_block = 0;

  3867.                 }

  3868.             }

  3869.         }

  3870.     } else { // skipped

  3871.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  3872.         for (i = 0; i < 6; i++) {

  3873.             v->mb_type[0][s->block_index[i]] = 0;

  3874.             s->dc_val[0][s->block_index[i]] = 0;

  3875.         }

  3876.         s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3877.         s->current_picture.qscale_table[mb_pos] = 0;

  3878.         v->blk_mv_type[s->block_index[0]] = 0;

  3879.         v->blk_mv_type[s->block_index[1]] = 0;

  3880.         v->blk_mv_type[s->block_index[2]] = 0;

  3881.         v->blk_mv_type[s->block_index[3]] = 0;

  3882.         vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3883.         vc1_mc_1mv(v, 0);

  3884.     }

  3885.     if (s->mb_x == s->mb_width - 1)

  3886.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);

  3887.     return 0;

  3888. }

  3889. 

  3890. static int vc1_decode_p_mb_intfi(VC1Context *v)

  3891. {

  3892.     MpegEncContext *s = &v->s;

  3893.     GetBitContext *gb = &s->gb;

  3894.     int i;

  3895.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3896.     int cbp = 0; /* cbp decoding stuff */

  3897.     int mqdiff, mquant; /* MB quantization */

  3898.     int ttmb = v->ttfrm; /* MB Transform type */

  3899. 

  3900.     int mb_has_coeffs = 1; /* last_flag */

  3901.     int dmv_x, dmv_y; /* Differential MV components */

  3902.     int val; /* temp values */

  3903.     int first_block = 1;

  3904.     int dst_idx, off;

  3905.     int pred_flag;

  3906.     int block_cbp = 0, pat, block_tt = 0;

  3907.     int idx_mbmode = 0;

  3908. 

  3909.     mquant = v->pq; /* Loosy initialization */

  3910. 

  3911.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  3912.     if (idx_mbmode <= 1) { // intra MB

  3913.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  3914.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  3915.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  3916.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;

  3917.         GET_MQUANT();

  3918.         s->current_picture.qscale_table[mb_pos] = mquant;

  3919.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  3920.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  3921.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  3922.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  3923.         mb_has_coeffs = idx_mbmode & 1;

  3924.         if (mb_has_coeffs)

  3925.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  3926.         dst_idx = 0;

  3927.         for (i = 0; i < 6; i++) {

  3928.             s->dc_val[0][s->block_index[i]]  = 0;

  3929.             v->mb_type[0][s->block_index[i]] = 1;

  3930.             dst_idx += i >> 2;

  3931.             val = ((cbp >> (5 - i)) & 1);

  3932.             v->a_avail = v->c_avail = 0;

  3933.             if (i == 2 || i == 3 || !s->first_slice_line)

  3934.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3935.             if (i == 1 || i == 3 || s->mb_x)

  3936.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3937. 

  3938.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3939.                                    (i & 4) ? v->codingset2 : v->codingset);

  3940.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3941.                 continue;

  3942.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3943.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3944.             off += v->cur_field_type ? ((i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0]) : 0;

  3945.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  3946.             // TODO: loop filter

  3947.         }

  3948.     } else {

  3949.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  3950.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  3951.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  3952.         if (idx_mbmode <= 5) { // 1-MV

  3953.             dmv_x = dmv_y = pred_flag = 0;

  3954.             if (idx_mbmode & 1) {

  3955.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  3956.             }

  3957.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  3958.             vc1_mc_1mv(v, 0);

  3959.             mb_has_coeffs = !(idx_mbmode & 2);

  3960.         } else { // 4-MV

  3961.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  3962.             for (i = 0; i < 6; i++) {

  3963.                 if (i < 4) {

  3964.                     dmv_x = dmv_y = pred_flag = 0;

  3965.                     val   = ((v->fourmvbp >> (3 - i)) & 1);

  3966.                     if (val) {

  3967.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  3968.                     }

  3969.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  3970.                     vc1_mc_4mv_luma(v, i, 0);

  3971.                 } else if (i == 4)

  3972.                     vc1_mc_4mv_chroma(v, 0);

  3973.             }

  3974.             mb_has_coeffs = idx_mbmode & 1;

  3975.         }

  3976.         if (mb_has_coeffs)

  3977.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3978.         if (cbp) {

  3979.             GET_MQUANT();

  3980.         }

  3981.         s->current_picture.qscale_table[mb_pos] = mquant;

  3982.         if (!v->ttmbf && cbp) {

  3983.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3984.         }

  3985.         dst_idx = 0;

  3986.         for (i = 0; i < 6; i++) {

  3987.             s->dc_val[0][s->block_index[i]] = 0;

  3988.             dst_idx += i >> 2;

  3989.             val = ((cbp >> (5 - i)) & 1);

  3990.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  3991.             if (v->cur_field_type)

  3992.                 off += (i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0];

  3993.             if (val) {

  3994.                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3995.                                          first_block, s->dest[dst_idx] + off,

  3996.                                          (i & 4) ? s->uvlinesize : s->linesize,

  3997.                                          (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  3998.                                          &block_tt);

  3999.                 block_cbp |= pat << (i << 2);

  4000.                 if (!v->ttmbf && ttmb < 8) ttmb = -1;

  4001.                 first_block = 0;

  4002.             }

  4003.         }

  4004.     }

  4005.     if (s->mb_x == s->mb_width - 1)

  4006.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4007.     return 0;

  4008. }

  4009. 

  4010. /** Decode one B-frame MB (in Main profile)

  4011.  */

  4012. static void vc1_decode_b_mb(VC1Context *v)

  4013. {

  4014.     MpegEncContext *s = &v->s;

  4015.     GetBitContext *gb = &s->gb;

  4016.     int i, j;

  4017.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4018.     int cbp = 0; /* cbp decoding stuff */

  4019.     int mqdiff, mquant; /* MB quantization */

  4020.     int ttmb = v->ttfrm; /* MB Transform type */

  4021.     int mb_has_coeffs = 0; /* last_flag */

  4022.     int index, index1; /* LUT indexes */

  4023.     int val, sign; /* temp values */

  4024.     int first_block = 1;

  4025.     int dst_idx, off;

  4026.     int skipped, direct;

  4027.     int dmv_x[2], dmv_y[2];

  4028.     int bmvtype = BMV_TYPE_BACKWARD;

  4029. 

  4030.     mquant      = v->pq; /* lossy initialization */

  4031.     s->mb_intra = 0;

  4032. 

  4033.     if (v->dmb_is_raw)

  4034.         direct = get_bits1(gb);

  4035.     else

  4036.         direct = v->direct_mb_plane[mb_pos];

  4037.     if (v->skip_is_raw)

  4038.         skipped = get_bits1(gb);

  4039.     else

  4040.         skipped = v->s.mbskip_table[mb_pos];

  4041. 

  4042.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4043.     for (i = 0; i < 6; i++) {

  4044.         v->mb_type[0][s->block_index[i]] = 0;

  4045.         s->dc_val[0][s->block_index[i]]  = 0;

  4046.     }

  4047.     s->current_picture.qscale_table[mb_pos] = 0;

  4048. 

  4049.     if (!direct) {

  4050.         if (!skipped) {

  4051.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  4052.             dmv_x[1] = dmv_x[0];

  4053.             dmv_y[1] = dmv_y[0];

  4054.         }

  4055.         if (skipped || !s->mb_intra) {

  4056.             bmvtype = decode012(gb);

  4057.             switch (bmvtype) {

  4058.             case 0:

  4059.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  4060.                 break;

  4061.             case 1:

  4062.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  4063.                 break;

  4064.             case 2:

  4065.                 bmvtype  = BMV_TYPE_INTERPOLATED;

  4066.                 dmv_x[0] = dmv_y[0] = 0;

  4067.             }

  4068.         }

  4069.     }

  4070.     for (i = 0; i < 6; i++)

  4071.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4072. 

  4073.     if (skipped) {

  4074.         if (direct)

  4075.             bmvtype = BMV_TYPE_INTERPOLATED;

  4076.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4077.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4078.         return;

  4079.     }

  4080.     if (direct) {

  4081.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4082.         GET_MQUANT();

  4083.         s->mb_intra = 0;

  4084.         s->current_picture.qscale_table[mb_pos] = mquant;

  4085.         if (!v->ttmbf)

  4086.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4087.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  4088.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4089.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4090.     } else {

  4091.         if (!mb_has_coeffs && !s->mb_intra) {

  4092.             /* no coded blocks - effectively skipped */

  4093.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4094.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4095.             return;

  4096.         }

  4097.         if (s->mb_intra && !mb_has_coeffs) {

  4098.             GET_MQUANT();

  4099.             s->current_picture.qscale_table[mb_pos] = mquant;

  4100.             s->ac_pred = get_bits1(gb);

  4101.             cbp = 0;

  4102.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4103.         } else {

  4104.             if (bmvtype == BMV_TYPE_INTERPOLATED) {

  4105.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  4106.                 if (!mb_has_coeffs) {

  4107.                     /* interpolated skipped block */

  4108.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4109.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4110.                     return;

  4111.                 }

  4112.             }

  4113.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4114.             if (!s->mb_intra) {

  4115.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4116.             }

  4117.             if (s->mb_intra)

  4118.                 s->ac_pred = get_bits1(gb);

  4119.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4120.             GET_MQUANT();

  4121.             s->current_picture.qscale_table[mb_pos] = mquant;

  4122.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  4123.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4124.         }

  4125.     }

  4126.     dst_idx = 0;

  4127.     for (i = 0; i < 6; i++) {

  4128.         s->dc_val[0][s->block_index[i]] = 0;

  4129.         dst_idx += i >> 2;

  4130.         val = ((cbp >> (5 - i)) & 1);

  4131.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4132.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4133.         if (s->mb_intra) {

  4134.             /* check if prediction blocks A and C are available */

  4135.             v->a_avail = v->c_avail = 0;

  4136.             if (i == 2 || i == 3 || !s->first_slice_line)

  4137.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4138.             if (i == 1 || i == 3 || s->mb_x)

  4139.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4140. 

  4141.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4142.                                    (i & 4) ? v->codingset2 : v->codingset);

  4143.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4144.                 continue;

  4145.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4146.             if (v->rangeredfrm)

  4147.                 for (j = 0; j < 64; j++)

  4148.                     s->block[i][j] <<= 1;

  4149.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  4150.         } else if (val) {

  4151.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4152.                                first_block, s->dest[dst_idx] + off,

  4153.                                (i & 4) ? s->uvlinesize : s->linesize,

  4154.                                (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4155.             if (!v->ttmbf && ttmb < 8)

  4156.                 ttmb = -1;

  4157.             first_block = 0;

  4158.         }

  4159.     }

  4160. }

  4161. 

  4162. /** Decode one B-frame MB (in interlaced field B picture)

  4163.  */

  4164. static void vc1_decode_b_mb_intfi(VC1Context *v)

  4165. {

  4166.     MpegEncContext *s = &v->s;

  4167.     GetBitContext *gb = &s->gb;

  4168.     int i, j;

  4169.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4170.     int cbp = 0; /* cbp decoding stuff */

  4171.     int mqdiff, mquant; /* MB quantization */

  4172.     int ttmb = v->ttfrm; /* MB Transform type */

  4173.     int mb_has_coeffs = 0; /* last_flag */

  4174.     int val; /* temp value */

  4175.     int first_block = 1;

  4176.     int dst_idx, off;

  4177.     int fwd;

  4178.     int dmv_x[2], dmv_y[2], pred_flag[2];

  4179.     int bmvtype = BMV_TYPE_BACKWARD;

  4180.     int idx_mbmode, interpmvp;

  4181. 

  4182.     mquant      = v->pq; /* Loosy initialization */

  4183.     s->mb_intra = 0;

  4184. 

  4185.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  4186.     if (idx_mbmode <= 1) { // intra MB

  4187.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  4188.         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  4189.         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  4190.         s->current_picture.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;

  4191.         GET_MQUANT();

  4192.         s->current_picture.qscale_table[mb_pos] = mquant;

  4193.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  4194.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  4195.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  4196.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  4197.         mb_has_coeffs = idx_mbmode & 1;

  4198.         if (mb_has_coeffs)

  4199.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  4200.         dst_idx = 0;

  4201.         for (i = 0; i < 6; i++) {

  4202.             s->dc_val[0][s->block_index[i]] = 0;

  4203.             dst_idx += i >> 2;

  4204.             val = ((cbp >> (5 - i)) & 1);

  4205.             v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4206.             v->a_avail                       = v->c_avail = 0;

  4207.             if (i == 2 || i == 3 || !s->first_slice_line)

  4208.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4209.             if (i == 1 || i == 3 || s->mb_x)

  4210.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4211. 

  4212.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4213.                                    (i & 4) ? v->codingset2 : v->codingset);

  4214.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4215.                 continue;

  4216.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4217.             if (v->rangeredfrm)

  4218.                 for (j = 0; j < 64; j++)

  4219.                     s->block[i][j] <<= 1;

  4220.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4221.             off += v->cur_field_type ? ((i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0]) : 0;

  4222.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  4223.             // TODO: yet to perform loop filter

  4224.         }

  4225.     } else {

  4226.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4227.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  4228.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  4229.         if (v->fmb_is_raw)

  4230.             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);

  4231.         else

  4232.             fwd = v->forward_mb_plane[mb_pos];

  4233.         if (idx_mbmode <= 5) { // 1-MV

  4234.             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4235.             pred_flag[0] = pred_flag[1] = 0;

  4236.             if (fwd)

  4237.                 bmvtype = BMV_TYPE_FORWARD;

  4238.             else {

  4239.                 bmvtype = decode012(gb);

  4240.                 switch (bmvtype) {

  4241.                 case 0:

  4242.                     bmvtype = BMV_TYPE_BACKWARD;

  4243.                     break;

  4244.                 case 1:

  4245.                     bmvtype = BMV_TYPE_DIRECT;

  4246.                     break;

  4247.                 case 2:

  4248.                     bmvtype   = BMV_TYPE_INTERPOLATED;

  4249.                     interpmvp = get_bits1(gb);

  4250.                 }

  4251.             }

  4252.             v->bmvtype = bmvtype;

  4253.             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {

  4254.                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4255.             }

  4256.             if (bmvtype == BMV_TYPE_INTERPOLATED && interpmvp) {

  4257.                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);

  4258.             }

  4259.             if (bmvtype == BMV_TYPE_DIRECT) {

  4260.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4261.                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;

  4262.             }

  4263.             vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);

  4264.             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);

  4265.             mb_has_coeffs = !(idx_mbmode & 2);

  4266.         } else { // 4-MV

  4267.             if (fwd)

  4268.                 bmvtype = BMV_TYPE_FORWARD;

  4269.             v->bmvtype  = bmvtype;

  4270.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4271.             for (i = 0; i < 6; i++) {

  4272.                 if (i < 4) {

  4273.                     dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4274.                     dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;

  4275.                     val = ((v->fourmvbp >> (3 - i)) & 1);

  4276.                     if (val) {

  4277.                         get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],

  4278.                                                  &dmv_y[bmvtype == BMV_TYPE_BACKWARD],

  4279.                                              &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4280.                     }

  4281.                     vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);

  4282.                     vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD);

  4283.                 } else if (i == 4)

  4284.                     vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);

  4285.             }

  4286.             mb_has_coeffs = idx_mbmode & 1;

  4287.         }

  4288.         if (mb_has_coeffs)

  4289.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4290.         if (cbp) {

  4291.             GET_MQUANT();

  4292.         }

  4293.         s->current_picture.qscale_table[mb_pos] = mquant;

  4294.         if (!v->ttmbf && cbp) {

  4295.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4296.         }

  4297.         dst_idx = 0;

  4298.         for (i = 0; i < 6; i++) {

  4299.             s->dc_val[0][s->block_index[i]] = 0;

  4300.             dst_idx += i >> 2;

  4301.             val = ((cbp >> (5 - i)) & 1);

  4302.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  4303.             if (v->cur_field_type)

  4304.                 off += (i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0];

  4305.             if (val) {

  4306.                 vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4307.                                    first_block, s->dest[dst_idx] + off,

  4308.                                    (i & 4) ? s->uvlinesize : s->linesize,

  4309.                                    (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4310.                 if (!v->ttmbf && ttmb < 8)

  4311.                     ttmb = -1;

  4312.                 first_block = 0;

  4313.             }

  4314.         }

  4315.     }

  4316. }

  4317. 

  4318. /** Decode blocks of I-frame

  4319.  */

  4320. static void vc1_decode_i_blocks(VC1Context *v)

  4321. {

  4322.     int k, j;

  4323.     MpegEncContext *s = &v->s;

  4324.     int cbp, val;

  4325.     uint8_t *coded_val;

  4326.     int mb_pos;

  4327. 

  4328.     /* select codingmode used for VLC tables selection */

  4329.     switch (v->y_ac_table_index) {

  4330.     case 0:

  4331.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4332.         break;

  4333.     case 1:

  4334.         v->codingset = CS_HIGH_MOT_INTRA;

  4335.         break;

  4336.     case 2:

  4337.         v->codingset = CS_MID_RATE_INTRA;

  4338.         break;

  4339.     }

  4340. 

  4341.     switch (v->c_ac_table_index) {

  4342.     case 0:

  4343.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4344.         break;

  4345.     case 1:

  4346.         v->codingset2 = CS_HIGH_MOT_INTER;

  4347.         break;

  4348.     case 2:

  4349.         v->codingset2 = CS_MID_RATE_INTER;

  4350.         break;

  4351.     }

  4352. 

  4353.     /* Set DC scale - y and c use the same */

  4354.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  4355.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  4356. 

  4357.     //do frame decode

  4358.     s->mb_x = s->mb_y = 0;

  4359.     s->mb_intra         = 1;

  4360.     s->first_slice_line = 1;

  4361.     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {

  4362.         s->mb_x = 0;

  4363.         ff_init_block_index(s);

  4364.         for (; s->mb_x < v->end_mb_x; s->mb_x++) {

  4365.             uint8_t *dst[6];

  4366.             ff_update_block_index(s);

  4367.             dst[0] = s->dest[0];

  4368.             dst[1] = dst[0] + 8;

  4369.             dst[2] = s->dest[0] + s->linesize * 8;

  4370.             dst[3] = dst[2] + 8;

  4371.             dst[4] = s->dest[1];

  4372.             dst[5] = s->dest[2];

  4373.             s->dsp.clear_blocks(s->block[0]);

  4374.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  4375.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  4376.             s->current_picture.qscale_table[mb_pos]                = v->pq;

  4377.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  4378.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  4379. 

  4380.             // do actual MB decoding and displaying

  4381.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4382.             v->s.ac_pred = get_bits1(&v->s.gb);

  4383. 

  4384.             for (k = 0; k < 6; k++) {

  4385.                 val = ((cbp >> (5 - k)) & 1);

  4386. 

  4387.                 if (k < 4) {

  4388.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4389.                     val        = val ^ pred;

  4390.                     *coded_val = val;

  4391.                 }

  4392.                 cbp |= val << (5 - k);

  4393. 

  4394.                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);

  4395. 

  4396.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4397.                     continue;

  4398.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);

  4399.                 if (v->pq >= 9 && v->overlap) {

  4400.                     if (v->rangeredfrm)

  4401.                         for (j = 0; j < 64; j++)

  4402.                             s->block[k][j] <<= 1;

  4403.                     s->dsp.put_signed_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4404.                 } else {

  4405.                     if (v->rangeredfrm)

  4406.                         for (j = 0; j < 64; j++)

  4407.                             s->block[k][j] = (s->block[k][j] - 64) << 1;

  4408.                     s->dsp.put_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4409.                 }

  4410.             }

  4411. 

  4412.             if (v->pq >= 9 && v->overlap) {

  4413.                 if (s->mb_x) {

  4414.                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);

  4415.                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4416.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4417.                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  4418.                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  4419.                     }

  4420.                 }

  4421.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  4422.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4423.                 if (!s->first_slice_line) {

  4424.                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);

  4425.                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  4426.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4427.                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  4428.                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  4429.                     }

  4430.                 }

  4431.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4432.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4433.             }

  4434.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  4435. 

  4436.             if (get_bits_count(&s->gb) > v->bits) {

  4437.                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);

  4438.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4439.                        get_bits_count(&s->gb), v->bits);

  4440.                 return;

  4441.             }

  4442.         }

  4443.         if (!v->s.loop_filter)

  4444.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  4445.         else if (s->mb_y)

  4446.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4447. 

  4448.         s->first_slice_line = 0;

  4449.     }

  4450.     if (v->s.loop_filter)

  4451.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4452. 

  4453.     /* This is intentionally mb_height and not end_mb_y - unlike in advanced

  4454.      * profile, these only differ are when decoding MSS2 rectangles. */

  4455.     ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);

  4456. }

  4457. 

  4458. /** Decode blocks of I-frame for advanced profile

  4459.  */

  4460. static void vc1_decode_i_blocks_adv(VC1Context *v)

  4461. {

  4462.     int k;

  4463.     MpegEncContext *s = &v->s;

  4464.     int cbp, val;

  4465.     uint8_t *coded_val;

  4466.     int mb_pos;

  4467.     int mquant = v->pq;

  4468.     int mqdiff;

  4469.     GetBitContext *gb = &s->gb;

  4470. 

  4471.     /* select codingmode used for VLC tables selection */

  4472.     switch (v->y_ac_table_index) {

  4473.     case 0:

  4474.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4475.         break;

  4476.     case 1:

  4477.         v->codingset = CS_HIGH_MOT_INTRA;

  4478.         break;

  4479.     case 2:

  4480.         v->codingset = CS_MID_RATE_INTRA;

  4481.         break;

  4482.     }

  4483. 

  4484.     switch (v->c_ac_table_index) {

  4485.     case 0:

  4486.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4487.         break;

  4488.     case 1:

  4489.         v->codingset2 = CS_HIGH_MOT_INTER;

  4490.         break;

  4491.     case 2:

  4492.         v->codingset2 = CS_MID_RATE_INTER;

  4493.         break;

  4494.     }

  4495. 

  4496.     // do frame decode

  4497.     s->mb_x             = s->mb_y = 0;

  4498.     s->mb_intra         = 1;

  4499.     s->first_slice_line = 1;

  4500.     s->mb_y             = s->start_mb_y;

  4501.     if (s->start_mb_y) {

  4502.         s->mb_x = 0;

  4503.         ff_init_block_index(s);

  4504.         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,

  4505.                (1 + s->b8_stride) * sizeof(*s->coded_block));

  4506.     }

  4507.     for (; s->mb_y < s->end_mb_y; s->mb_y++) {

  4508.         s->mb_x = 0;

  4509.         ff_init_block_index(s);

  4510.         for (;s->mb_x < s->mb_width; s->mb_x++) {

  4511.             int16_t (*block)[64] = v->block[v->cur_blk_idx];

  4512.             ff_update_block_index(s);

  4513.             s->dsp.clear_blocks(block[0]);

  4514.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4515.             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;

  4516.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  4517.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  4518. 

  4519.             // do actual MB decoding and displaying

  4520.             if (v->fieldtx_is_raw)

  4521.                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);

  4522.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4523.             if ( v->acpred_is_raw)

  4524.                 v->s.ac_pred = get_bits1(&v->s.gb);

  4525.             else

  4526.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  4527. 

  4528.             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)

  4529.                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);

  4530. 

  4531.             GET_MQUANT();

  4532. 

  4533.             s->current_picture.qscale_table[mb_pos] = mquant;

  4534.             /* Set DC scale - y and c use the same */

  4535.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  4536.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  4537. 

  4538.             for (k = 0; k < 6; k++) {

  4539.                 val = ((cbp >> (5 - k)) & 1);

  4540. 

  4541.                 if (k < 4) {

  4542.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4543.                     val        = val ^ pred;

  4544.                     *coded_val = val;

  4545.                 }

  4546.                 cbp |= val << (5 - k);

  4547. 

  4548.                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);

  4549.                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);

  4550. 

  4551.                 vc1_decode_i_block_adv(v, block[k], k, val,

  4552.                                        (k < 4) ? v->codingset : v->codingset2, mquant);

  4553. 

  4554.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4555.                     continue;

  4556.                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);

  4557.             }

  4558. 

  4559.             vc1_smooth_overlap_filter_iblk(v);

  4560.             vc1_put_signed_blocks_clamped(v);

  4561.             if (v->s.loop_filter) vc1_loop_filter_iblk_delayed(v, v->pq);

  4562. 

  4563.             if (get_bits_count(&s->gb) > v->bits) {

  4564.                 // TODO: may need modification to handle slice coding

  4565.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4566.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4567.                        get_bits_count(&s->gb), v->bits);

  4568.                 return;

  4569.             }

  4570.         }

  4571.         if (!v->s.loop_filter)

  4572.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  4573.         else if (s->mb_y)

  4574.             ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);

  4575.         s->first_slice_line = 0;

  4576.     }

  4577. 

  4578.     /* raw bottom MB row */

  4579.     s->mb_x = 0;

  4580.     ff_init_block_index(s);

  4581.     for (;s->mb_x < s->mb_width; s->mb_x++) {

  4582.         ff_update_block_index(s);

  4583.         vc1_put_signed_blocks_clamped(v);

  4584.         if (v->s.loop_filter)

  4585.             vc1_loop_filter_iblk_delayed(v, v->pq);

  4586.     }

  4587.     if (v->s.loop_filter)

  4588.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y-1)*16, 16);

  4589.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4590.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4591. }

  4592. 

  4593. static void vc1_decode_p_blocks(VC1Context *v)

  4594. {

  4595.     MpegEncContext *s = &v->s;

  4596.     int apply_loop_filter;

  4597. 

  4598.     /* select codingmode used for VLC tables selection */

  4599.     switch (v->c_ac_table_index) {

  4600.     case 0:

  4601.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4602.         break;

  4603.     case 1:

  4604.         v->codingset = CS_HIGH_MOT_INTRA;

  4605.         break;

  4606.     case 2:

  4607.         v->codingset = CS_MID_RATE_INTRA;

  4608.         break;

  4609.     }

  4610. 

  4611.     switch (v->c_ac_table_index) {

  4612.     case 0:

  4613.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4614.         break;

  4615.     case 1:

  4616.         v->codingset2 = CS_HIGH_MOT_INTER;

  4617.         break;

  4618.     case 2:

  4619.         v->codingset2 = CS_MID_RATE_INTER;

  4620.         break;

  4621.     }

  4622. 

  4623.     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY);

  4624.     s->first_slice_line = 1;

  4625.     memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);

  4626.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4627.         s->mb_x = 0;

  4628.         ff_init_block_index(s);

  4629.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4630.             ff_update_block_index(s);

  4631. 

  4632.             if (v->fcm == ILACE_FIELD)

  4633.                 vc1_decode_p_mb_intfi(v);

  4634.             else if (v->fcm == ILACE_FRAME)

  4635.                 vc1_decode_p_mb_intfr(v);

  4636.             else vc1_decode_p_mb(v);

  4637.             if (s->mb_y != s->start_mb_y && apply_loop_filter && v->fcm == PROGRESSIVE)

  4638.                 vc1_apply_p_loop_filter(v);

  4639.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4640.                 // TODO: may need modification to handle slice coding

  4641.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4642.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  4643.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  4644.                 return;

  4645.             }

  4646.         }

  4647.         memmove(v->cbp_base,      v->cbp,      sizeof(v->cbp_base[0])      * s->mb_stride);

  4648.         memmove(v->ttblk_base,    v->ttblk,    sizeof(v->ttblk_base[0])    * s->mb_stride);

  4649.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4650.         memmove(v->luma_mv_base,  v->luma_mv,  sizeof(v->luma_mv_base[0])  * s->mb_stride);

  4651.         if (s->mb_y != s->start_mb_y) ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4652.         s->first_slice_line = 0;

  4653.     }

  4654.     if (apply_loop_filter) {

  4655.         s->mb_x = 0;

  4656.         ff_init_block_index(s);

  4657.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4658.             ff_update_block_index(s);

  4659.             vc1_apply_p_loop_filter(v);

  4660.         }

  4661.     }

  4662.     if (s->end_mb_y >= s->start_mb_y)

  4663.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4664.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4665.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4666. }

  4667. 

  4668. static void vc1_decode_b_blocks(VC1Context *v)

  4669. {

  4670.     MpegEncContext *s = &v->s;

  4671. 

  4672.     /* select codingmode used for VLC tables selection */

  4673.     switch (v->c_ac_table_index) {

  4674.     case 0:

  4675.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4676.         break;

  4677.     case 1:

  4678.         v->codingset = CS_HIGH_MOT_INTRA;

  4679.         break;

  4680.     case 2:

  4681.         v->codingset = CS_MID_RATE_INTRA;

  4682.         break;

  4683.     }

  4684. 

  4685.     switch (v->c_ac_table_index) {

  4686.     case 0:

  4687.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4688.         break;

  4689.     case 1:

  4690.         v->codingset2 = CS_HIGH_MOT_INTER;

  4691.         break;

  4692.     case 2:

  4693.         v->codingset2 = CS_MID_RATE_INTER;

  4694.         break;

  4695.     }

  4696. 

  4697.     s->first_slice_line = 1;

  4698.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4699.         s->mb_x = 0;

  4700.         ff_init_block_index(s);

  4701.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4702.             ff_update_block_index(s);

  4703. 

  4704.             if (v->fcm == ILACE_FIELD)

  4705.                 vc1_decode_b_mb_intfi(v);

  4706.             else

  4707.                 vc1_decode_b_mb(v);

  4708.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4709.                 // TODO: may need modification to handle slice coding

  4710.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4711.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  4712.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  4713.                 return;

  4714.             }

  4715.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  4716.         }

  4717.         if (!v->s.loop_filter)

  4718.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  4719.         else if (s->mb_y)

  4720.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4721.         s->first_slice_line = 0;

  4722.     }

  4723.     if (v->s.loop_filter)

  4724.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4725.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4726.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4727. }

  4728. 

  4729. static void vc1_decode_skip_blocks(VC1Context *v)

  4730. {

  4731.     MpegEncContext *s = &v->s;

  4732. 

  4733.     ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);

  4734.     s->first_slice_line = 1;

  4735.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4736.         s->mb_x = 0;

  4737.         ff_init_block_index(s);

  4738.         ff_update_block_index(s);

  4739.         memcpy(s->dest[0], s->last_picture.f.data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);

  4740.         memcpy(s->dest[1], s->last_picture.f.data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  4741.         memcpy(s->dest[2], s->last_picture.f.data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  4742.         ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  4743.         s->first_slice_line = 0;

  4744.     }

  4745.     s->pict_type = AV_PICTURE_TYPE_P;

  4746. }

  4747. 

  4748. void ff_vc1_decode_blocks(VC1Context *v)

  4749. {

  4750. 

  4751.     v->s.esc3_level_length = 0;

  4752.     if (v->x8_type) {

  4753.         ff_intrax8_decode_picture(&v->x8, 2*v->pq + v->halfpq, v->pq * !v->pquantizer);

  4754.     } else {

  4755.         v->cur_blk_idx     =  0;

  4756.         v->left_blk_idx    = -1;

  4757.         v->topleft_blk_idx =  1;

  4758.         v->top_blk_idx     =  2;

  4759.         switch (v->s.pict_type) {

  4760.         case AV_PICTURE_TYPE_I:

  4761.             if (v->profile == PROFILE_ADVANCED)

  4762.                 vc1_decode_i_blocks_adv(v);

  4763.             else

  4764.                 vc1_decode_i_blocks(v);

  4765.             break;

  4766.         case AV_PICTURE_TYPE_P:

  4767.             if (v->p_frame_skipped)

  4768.                 vc1_decode_skip_blocks(v);

  4769.             else

  4770.                 vc1_decode_p_blocks(v);

  4771.             break;

  4772.         case AV_PICTURE_TYPE_B:

  4773.             if (v->bi_type) {

  4774.                 if (v->profile == PROFILE_ADVANCED)

  4775.                     vc1_decode_i_blocks_adv(v);

  4776.                 else

  4777.                     vc1_decode_i_blocks(v);

  4778.             } else

  4779.                 vc1_decode_b_blocks(v);

  4780.             break;

  4781.         }

  4782.     }

  4783. }

  4784. 

  4785. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  4786. 

  4787. typedef struct {

  4788.     /**

  4789.      * Transform coefficients for both sprites in 16.16 fixed point format,

  4790.      * in the order they appear in the bitstream:

  4791.      *  x scale

  4792.      *  rotation 1 (unused)

  4793.      *  x offset

  4794.      *  rotation 2 (unused)

  4795.      *  y scale

  4796.      *  y offset

  4797.      *  alpha

  4798.      */

  4799.     int coefs[2][7];

  4800. 

  4801.     int effect_type, effect_flag;

  4802.     int effect_pcount1, effect_pcount2;   ///< amount of effect parameters stored in effect_params

  4803.     int effect_params1[15], effect_params2[10]; ///< effect parameters in 16.16 fixed point format

  4804. } SpriteData;

  4805. 

  4806. static inline int get_fp_val(GetBitContext* gb)

  4807. {

  4808.     return (get_bits_long(gb, 30) - (1 << 29)) << 1;

  4809. }

  4810. 

  4811. static void vc1_sprite_parse_transform(GetBitContext* gb, int c[7])

  4812. {

  4813.     c[1] = c[3] = 0;

  4814. 

  4815.     switch (get_bits(gb, 2)) {

  4816.     case 0:

  4817.         c[0] = 1 << 16;

  4818.         c[2] = get_fp_val(gb);

  4819.         c[4] = 1 << 16;

  4820.         break;

  4821.     case 1:

  4822.         c[0] = c[4] = get_fp_val(gb);

  4823.         c[2] = get_fp_val(gb);

  4824.         break;

  4825.     case 2:

  4826.         c[0] = get_fp_val(gb);

  4827.         c[2] = get_fp_val(gb);

  4828.         c[4] = get_fp_val(gb);

  4829.         break;

  4830.     case 3:

  4831.         c[0] = get_fp_val(gb);

  4832.         c[1] = get_fp_val(gb);

  4833.         c[2] = get_fp_val(gb);

  4834.         c[3] = get_fp_val(gb);

  4835.         c[4] = get_fp_val(gb);

  4836.         break;

  4837.     }

  4838.     c[5] = get_fp_val(gb);

  4839.     if (get_bits1(gb))

  4840.         c[6] = get_fp_val(gb);

  4841.     else

  4842.         c[6] = 1 << 16;

  4843. }

  4844. 

  4845. static void vc1_parse_sprites(VC1Context *v, GetBitContext* gb, SpriteData* sd)

  4846. {

  4847.     AVCodecContext *avctx = v->s.avctx;

  4848.     int sprite, i;

  4849. 

  4850.     for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  4851.         vc1_sprite_parse_transform(gb, sd->coefs[sprite]);

  4852.         if (sd->coefs[sprite][1] || sd->coefs[sprite][3])

  4853.             av_log_ask_for_sample(avctx, "Rotation coefficients are not zero");

  4854.         av_log(avctx, AV_LOG_DEBUG, sprite ? "S2:" : "S1:");

  4855.         for (i = 0; i < 7; i++)

  4856.             av_log(avctx, AV_LOG_DEBUG, " %d.%.3d",

  4857.                    sd->coefs[sprite][i] / (1<<16),

  4858.                    (abs(sd->coefs[sprite][i]) & 0xFFFF) * 1000 / (1 << 16));

  4859.         av_log(avctx, AV_LOG_DEBUG, "\n");

  4860.     }

  4861. 

  4862.     skip_bits(gb, 2);

  4863.     if (sd->effect_type = get_bits_long(gb, 30)) {

  4864.         switch (sd->effect_pcount1 = get_bits(gb, 4)) {

  4865.         case 7:

  4866.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  4867.             break;

  4868.         case 14:

  4869.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  4870.             vc1_sprite_parse_transform(gb, sd->effect_params1 + 7);

  4871.             break;

  4872.         default:

  4873.             for (i = 0; i < sd->effect_pcount1; i++)

  4874.                 sd->effect_params1[i] = get_fp_val(gb);

  4875.         }

  4876.         if (sd->effect_type != 13 || sd->effect_params1[0] != sd->coefs[0][6]) {

  4877.             // effect 13 is simple alpha blending and matches the opacity above

  4878.             av_log(avctx, AV_LOG_DEBUG, "Effect: %d; params: ", sd->effect_type);

  4879.             for (i = 0; i < sd->effect_pcount1; i++)

  4880.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  4881.                        sd->effect_params1[i] / (1 << 16),

  4882.                        (abs(sd->effect_params1[i]) & 0xFFFF) * 1000 / (1 << 16));

  4883.             av_log(avctx, AV_LOG_DEBUG, "\n");

  4884.         }

  4885. 

  4886.         sd->effect_pcount2 = get_bits(gb, 16);

  4887.         if (sd->effect_pcount2 > 10) {

  4888.             av_log(avctx, AV_LOG_ERROR, "Too many effect parameters\n");

  4889.             return;

  4890.         } else if (sd->effect_pcount2) {

  4891.             i = -1;

  4892.             av_log(avctx, AV_LOG_DEBUG, "Effect params 2: ");

  4893.             while (++i < sd->effect_pcount2) {

  4894.                 sd->effect_params2[i] = get_fp_val(gb);

  4895.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  4896.                        sd->effect_params2[i] / (1 << 16),

  4897.                        (abs(sd->effect_params2[i]) & 0xFFFF) * 1000 / (1 << 16));

  4898.             }

  4899.             av_log(avctx, AV_LOG_DEBUG, "\n");

  4900.         }

  4901.     }

  4902.     if (sd->effect_flag = get_bits1(gb))

  4903.         av_log(avctx, AV_LOG_DEBUG, "Effect flag set\n");

  4904. 

  4905.     if (get_bits_count(gb) >= gb->size_in_bits +

  4906.        (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE ? 64 : 0))

  4907.         av_log(avctx, AV_LOG_ERROR, "Buffer overrun\n");

  4908.     if (get_bits_count(gb) < gb->size_in_bits - 8)

  4909.         av_log(avctx, AV_LOG_WARNING, "Buffer not fully read\n");

  4910. }

  4911. 

  4912. static void vc1_draw_sprites(VC1Context *v, SpriteData* sd)

  4913. {

  4914.     int i, plane, row, sprite;

  4915.     int sr_cache[2][2] = { { -1, -1 }, { -1, -1 } };

  4916.     uint8_t* src_h[2][2];

  4917.     int xoff[2], xadv[2], yoff[2], yadv[2], alpha;

  4918.     int ysub[2];

  4919.     MpegEncContext *s = &v->s;

  4920. 

  4921.     for (i = 0; i < 2; i++) {

  4922.         xoff[i] = av_clip(sd->coefs[i][2], 0, v->sprite_width-1 << 16);

  4923.         xadv[i] = sd->coefs[i][0];

  4924.         if (xadv[i] != 1<<16 || (v->sprite_width << 16) - (v->output_width << 16) - xoff[i])

  4925.             xadv[i] = av_clip(xadv[i], 0, ((v->sprite_width<<16) - xoff[i] - 1) / v->output_width);

  4926. 

  4927.         yoff[i] = av_clip(sd->coefs[i][5], 0, v->sprite_height-1 << 16);

  4928.         yadv[i] = av_clip(sd->coefs[i][4], 0, ((v->sprite_height << 16) - yoff[i]) / v->output_height);

  4929.     }

  4930.     alpha = av_clip(sd->coefs[1][6], 0, (1<<16) - 1);

  4931. 

  4932.     for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++) {

  4933.         int width = v->output_width>>!!plane;

  4934. 

  4935.         for (row = 0; row < v->output_height>>!!plane; row++) {

  4936.             uint8_t *dst = v->sprite_output_frame.data[plane] +

  4937.                            v->sprite_output_frame.linesize[plane] * row;

  4938. 

  4939.             for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  4940.                 uint8_t *iplane = s->current_picture.f.data[plane];

  4941.                 int      iline  = s->current_picture.f.linesize[plane];

  4942.                 int      ycoord = yoff[sprite] + yadv[sprite] * row;

  4943.                 int      yline  = ycoord >> 16;

  4944.                 int      next_line;

  4945.                 ysub[sprite] = ycoord & 0xFFFF;

  4946.                 if (sprite) {

  4947.                     iplane = s->last_picture.f.data[plane];

  4948.                     iline  = s->last_picture.f.linesize[plane];

  4949.                 }

  4950.                 next_line = FFMIN(yline + 1, (v->sprite_height >> !!plane) - 1) * iline;

  4951.                 if (!(xoff[sprite] & 0xFFFF) && xadv[sprite] == 1 << 16) {

  4952.                         src_h[sprite][0] = iplane + (xoff[sprite] >> 16) +  yline      * iline;

  4953.                     if (ysub[sprite])

  4954.                         src_h[sprite][1] = iplane + (xoff[sprite] >> 16) + next_line;

  4955.                 } else {

  4956.                     if (sr_cache[sprite][0] != yline) {

  4957.                         if (sr_cache[sprite][1] == yline) {

  4958.                             FFSWAP(uint8_t*, v->sr_rows[sprite][0], v->sr_rows[sprite][1]);

  4959.                             FFSWAP(int,        sr_cache[sprite][0],   sr_cache[sprite][1]);

  4960.                         } else {

  4961.                             v->vc1dsp.sprite_h(v->sr_rows[sprite][0], iplane + yline * iline, xoff[sprite], xadv[sprite], width);

  4962.                             sr_cache[sprite][0] = yline;

  4963.                         }

  4964.                     }

  4965.                     if (ysub[sprite] && sr_cache[sprite][1] != yline + 1) {

  4966.                         v->vc1dsp.sprite_h(v->sr_rows[sprite][1],

  4967.                                            iplane + next_line, xoff[sprite],

  4968.                                            xadv[sprite], width);

  4969.                         sr_cache[sprite][1] = yline + 1;

  4970.                     }

  4971.                     src_h[sprite][0] = v->sr_rows[sprite][0];

  4972.                     src_h[sprite][1] = v->sr_rows[sprite][1];

  4973.                 }

  4974.             }

  4975. 

  4976.             if (!v->two_sprites) {

  4977.                 if (ysub[0]) {

  4978.                     v->vc1dsp.sprite_v_single(dst, src_h[0][0], src_h[0][1], ysub[0], width);

  4979.                 } else {

  4980.                     memcpy(dst, src_h[0][0], width);

  4981.                 }

  4982.             } else {

  4983.                 if (ysub[0] && ysub[1]) {

  4984.                     v->vc1dsp.sprite_v_double_twoscale(dst, src_h[0][0], src_h[0][1], ysub[0],

  4985.                                                        src_h[1][0], src_h[1][1], ysub[1], alpha, width);

  4986.                 } else if (ysub[0]) {

  4987.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[0][0], src_h[0][1], ysub[0],

  4988.                                                        src_h[1][0], alpha, width);

  4989.                 } else if (ysub[1]) {

  4990.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[1][0], src_h[1][1], ysub[1],

  4991.                                                        src_h[0][0], (1<<16)-1-alpha, width);

  4992.                 } else {

  4993.                     v->vc1dsp.sprite_v_double_noscale(dst, src_h[0][0], src_h[1][0], alpha, width);

  4994.                 }

  4995.             }

  4996.         }

  4997. 

  4998.         if (!plane) {

  4999.             for (i = 0; i < 2; i++) {

  5000.                 xoff[i] >>= 1;

  5001.                 yoff[i] >>= 1;

  5002.             }

  5003.         }

  5004. 

  5005.     }

  5006. }

  5007. 

  5008. 

  5009. static int vc1_decode_sprites(VC1Context *v, GetBitContext* gb)

  5010. {

  5011.     MpegEncContext *s     = &v->s;

  5012.     AVCodecContext *avctx = s->avctx;

  5013.     SpriteData sd;

  5014. 

  5015.     vc1_parse_sprites(v, gb, &sd);

  5016. 

  5017.     if (!s->current_picture.f.data[0]) {

  5018.         av_log(avctx, AV_LOG_ERROR, "Got no sprites\n");

  5019.         return -1;

  5020.     }

  5021. 

  5022.     if (v->two_sprites && (!s->last_picture_ptr || !s->last_picture.f.data[0])) {

  5023.         av_log(avctx, AV_LOG_WARNING, "Need two sprites, only got one\n");

  5024.         v->two_sprites = 0;

  5025.     }

  5026. 

  5027.     av_frame_unref(&v->sprite_output_frame);

  5028.     if (ff_get_buffer(avctx, &v->sprite_output_frame, 0) < 0) {

  5029.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  5030.         return -1;

  5031.     }

  5032. 

  5033.     vc1_draw_sprites(v, &sd);

  5034. 

  5035.     return 0;

  5036. }

  5037. 

  5038. static void vc1_sprite_flush(AVCodecContext *avctx)

  5039. {

  5040.     VC1Context *v     = avctx->priv_data;

  5041.     MpegEncContext *s = &v->s;

  5042.     AVFrame *f = &s->current_picture.f;

  5043.     int plane, i;

  5044. 

  5045.     /* Windows Media Image codecs have a convergence interval of two keyframes.

  5046.        Since we can't enforce it, clear to black the missing sprite. This is

  5047.        wrong but it looks better than doing nothing. */

  5048. 

  5049.     if (f->data[0])

  5050.         for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++)

  5051.             for (i = 0; i < v->sprite_height>>!!plane; i++)

  5052.                 memset(f->data[plane] + i * f->linesize[plane],

  5053.                        plane ? 128 : 0, f->linesize[plane]);

  5054. }

  5055. 

  5056. #endif

  5057. 

  5058. av_cold int ff_vc1_decode_init_alloc_tables(VC1Context *v)

  5059. {

  5060.     MpegEncContext *s = &v->s;

  5061.     int i;

  5062. 

  5063.     /* Allocate mb bitplanes */

  5064.     v->mv_type_mb_plane = av_malloc (s->mb_stride * s->mb_height);

  5065.     v->direct_mb_plane  = av_malloc (s->mb_stride * s->mb_height);

  5066.     v->forward_mb_plane = av_malloc (s->mb_stride * s->mb_height);

  5067.     v->fieldtx_plane    = av_mallocz(s->mb_stride * s->mb_height);

  5068.     v->acpred_plane     = av_malloc (s->mb_stride * s->mb_height);

  5069.     v->over_flags_plane = av_malloc (s->mb_stride * s->mb_height);

  5070. 

  5071.     v->n_allocated_blks = s->mb_width + 2;

  5072.     v->block            = av_malloc(sizeof(*v->block) * v->n_allocated_blks);

  5073.     v->cbp_base         = av_malloc(sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  5074.     v->cbp              = v->cbp_base + s->mb_stride;

  5075.     v->ttblk_base       = av_malloc(sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  5076.     v->ttblk            = v->ttblk_base + s->mb_stride;

  5077.     v->is_intra_base    = av_mallocz(sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  5078.     v->is_intra         = v->is_intra_base + s->mb_stride;

  5079.     v->luma_mv_base     = av_malloc(sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);

  5080.     v->luma_mv          = v->luma_mv_base + s->mb_stride;

  5081. 

  5082.     /* allocate block type info in that way so it could be used with s->block_index[] */

  5083.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5084.     v->mb_type[0]   = v->mb_type_base + s->b8_stride + 1;

  5085.     v->mb_type[1]   = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  5086.     v->mb_type[2]   = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  5087. 

  5088.     /* allocate memory to store block level MV info */

  5089.     v->blk_mv_type_base = av_mallocz(     s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5090.     v->blk_mv_type      = v->blk_mv_type_base + s->b8_stride + 1;

  5091.     v->mv_f_base        = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5092.     v->mv_f[0]          = v->mv_f_base + s->b8_stride + 1;

  5093.     v->mv_f[1]          = v->mv_f[0] + (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5094.     v->mv_f_last_base   = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5095.     v->mv_f_last[0]     = v->mv_f_last_base + s->b8_stride + 1;

  5096.     v->mv_f_last[1]     = v->mv_f_last[0] + (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5097.     v->mv_f_next_base   = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5098.     v->mv_f_next[0]     = v->mv_f_next_base + s->b8_stride + 1;

  5099.     v->mv_f_next[1]     = v->mv_f_next[0] + (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5100. 

  5101.     /* Init coded blocks info */

  5102.     if (v->profile == PROFILE_ADVANCED) {

  5103. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  5104. //            return -1;

  5105. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  5106. //            return -1;

  5107.     }

  5108. 

  5109.     ff_intrax8_common_init(&v->x8,s);

  5110. 

  5111.     if (s->avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || s->avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5112.         for (i = 0; i < 4; i++)

  5113.             if (!(v->sr_rows[i >> 1][i & 1] = av_malloc(v->output_width))) return -1;

  5114.     }

  5115. 

  5116.     if (!v->mv_type_mb_plane || !v->direct_mb_plane || !v->acpred_plane || !v->over_flags_plane ||

  5117.         !v->block || !v->cbp_base || !v->ttblk_base || !v->is_intra_base || !v->luma_mv_base ||

  5118.         !v->mb_type_base)

  5119.             return -1;

  5120. 

  5121.     return 0;

  5122. }

  5123. 

  5124. av_cold void ff_vc1_init_transposed_scantables(VC1Context *v)

  5125. {

  5126.     int i;

  5127.     for (i = 0; i < 64; i++) {

  5128. #define transpose(x) ((x >> 3) | ((x & 7) << 3))

  5129.         v->zz_8x8[0][i] = transpose(ff_wmv1_scantable[0][i]);

  5130.         v->zz_8x8[1][i] = transpose(ff_wmv1_scantable[1][i]);

  5131.         v->zz_8x8[2][i] = transpose(ff_wmv1_scantable[2][i]);

  5132.         v->zz_8x8[3][i] = transpose(ff_wmv1_scantable[3][i]);

  5133.         v->zzi_8x8[i]   = transpose(ff_vc1_adv_interlaced_8x8_zz[i]);

  5134.     }

  5135.     v->left_blk_sh = 0;

  5136.     v->top_blk_sh  = 3;

  5137. }

  5138. 

  5139. /** Initialize a VC1/WMV3 decoder

  5140.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5141.  * @todo TODO: Decypher remaining bits in extra_data

  5142.  */

  5143. static av_cold int vc1_decode_init(AVCodecContext *avctx)

  5144. {

  5145.     VC1Context *v = avctx->priv_data;

  5146.     MpegEncContext *s = &v->s;

  5147.     GetBitContext gb;

  5148. 

  5149.     /* save the container output size for WMImage */

  5150.     v->output_width  = avctx->width;

  5151.     v->output_height = avctx->height;

  5152. 

  5153.     if (!avctx->extradata_size || !avctx->extradata)

  5154.         return -1;

  5155.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  5156.         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);

  5157.     else

  5158.         avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  5159.     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);

  5160.     v->s.avctx = avctx;

  5161.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  5162.     v->s.flags   |= CODEC_FLAG_EMU_EDGE;

  5163. 

  5164.     if (ff_vc1_init_common(v) < 0)

  5165.         return -1;

  5166.     ff_h264chroma_init(&v->h264chroma, 8);

  5167.     ff_vc1dsp_init(&v->vc1dsp);

  5168. 

  5169.     if (avctx->codec_id == AV_CODEC_ID_WMV3 || avctx->codec_id == AV_CODEC_ID_WMV3IMAGE) {

  5170.         int count = 0;

  5171. 

  5172.         // looks like WMV3 has a sequence header stored in the extradata

  5173.         // advanced sequence header may be before the first frame

  5174.         // the last byte of the extradata is a version number, 1 for the

  5175.         // samples we can decode

  5176. 

  5177.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  5178. 

  5179.         if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0)

  5180.           return -1;

  5181. 

  5182.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  5183.         if (count > 0) {

  5184.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  5185.                    count, get_bits(&gb, count));

  5186.         } else if (count < 0) {

  5187.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  5188.         }

  5189.     } else { // VC1/WVC1/WVP2

  5190.         const uint8_t *start = avctx->extradata;

  5191.         uint8_t *end = avctx->extradata + avctx->extradata_size;

  5192.         const uint8_t *next;

  5193.         int size, buf2_size;

  5194.         uint8_t *buf2 = NULL;

  5195.         int seq_initialized = 0, ep_initialized = 0;

  5196. 

  5197.         if (avctx->extradata_size < 16) {

  5198.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  5199.             return -1;

  5200.         }

  5201. 

  5202.         buf2  = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5203.         start = find_next_marker(start, end); // in WVC1 extradata first byte is its size, but can be 0 in mkv

  5204.         next  = start;

  5205.         for (; next < end; start = next) {

  5206.             next = find_next_marker(start + 4, end);

  5207.             size = next - start - 4;

  5208.             if (size <= 0)

  5209.                 continue;

  5210.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  5211.             init_get_bits(&gb, buf2, buf2_size * 8);

  5212.             switch (AV_RB32(start)) {

  5213.             case VC1_CODE_SEQHDR:

  5214.                 if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0) {

  5215.                     av_free(buf2);

  5216.                     return -1;

  5217.                 }

  5218.                 seq_initialized = 1;

  5219.                 break;

  5220.             case VC1_CODE_ENTRYPOINT:

  5221.                 if (ff_vc1_decode_entry_point(avctx, v, &gb) < 0) {

  5222.                     av_free(buf2);

  5223.                     return -1;

  5224.                 }

  5225.                 ep_initialized = 1;

  5226.                 break;

  5227.             }

  5228.         }

  5229.         av_free(buf2);

  5230.         if (!seq_initialized || !ep_initialized) {

  5231.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  5232.             return -1;

  5233.         }

  5234.         v->res_sprite = (avctx->codec_id == AV_CODEC_ID_VC1IMAGE);

  5235.     }

  5236. 

  5237.     avctx->profile = v->profile;

  5238.     if (v->profile == PROFILE_ADVANCED)

  5239.         avctx->level = v->level;

  5240. 

  5241.     avctx->has_b_frames = !!avctx->max_b_frames;

  5242. 

  5243.     s->mb_width  = (avctx->coded_width  + 15) >> 4;

  5244.     s->mb_height = (avctx->coded_height + 15) >> 4;

  5245. 

  5246.     if (v->profile == PROFILE_ADVANCED || v->res_fasttx) {

  5247.         ff_vc1_init_transposed_scantables(v);

  5248.     } else {

  5249.         memcpy(v->zz_8x8, ff_wmv1_scantable, 4*64);

  5250.         v->left_blk_sh = 3;

  5251.         v->top_blk_sh  = 0;

  5252.     }

  5253. 

  5254.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5255.         v->sprite_width  = avctx->coded_width;

  5256.         v->sprite_height = avctx->coded_height;

  5257. 

  5258.         avctx->coded_width  = avctx->width  = v->output_width;

  5259.         avctx->coded_height = avctx->height = v->output_height;

  5260. 

  5261.         // prevent 16.16 overflows

  5262.         if (v->sprite_width  > 1 << 14 ||

  5263.             v->sprite_height > 1 << 14 ||

  5264.             v->output_width  > 1 << 14 ||

  5265.             v->output_height > 1 << 14) return -1;

  5266.     }

  5267.     return 0;

  5268. }

  5269. 

  5270. /** Close a VC1/WMV3 decoder

  5271.  * @warning Initial try at using MpegEncContext stuff

  5272.  */

  5273. av_cold int ff_vc1_decode_end(AVCodecContext *avctx)

  5274. {

  5275.     VC1Context *v = avctx->priv_data;

  5276.     int i;

  5277. 

  5278.     av_frame_unref(&v->sprite_output_frame);

  5279. 

  5280.     for (i = 0; i < 4; i++)

  5281.         av_freep(&v->sr_rows[i >> 1][i & 1]);

  5282.     av_freep(&v->hrd_rate);

  5283.     av_freep(&v->hrd_buffer);

  5284.     ff_MPV_common_end(&v->s);

  5285.     av_freep(&v->mv_type_mb_plane);

  5286.     av_freep(&v->direct_mb_plane);

  5287.     av_freep(&v->forward_mb_plane);

  5288.     av_freep(&v->fieldtx_plane);

  5289.     av_freep(&v->acpred_plane);

  5290.     av_freep(&v->over_flags_plane);

  5291.     av_freep(&v->mb_type_base);

  5292.     av_freep(&v->blk_mv_type_base);

  5293.     av_freep(&v->mv_f_base);

  5294.     av_freep(&v->mv_f_last_base);

  5295.     av_freep(&v->mv_f_next_base);

  5296.     av_freep(&v->block);

  5297.     av_freep(&v->cbp_base);

  5298.     av_freep(&v->ttblk_base);

  5299.     av_freep(&v->is_intra_base); // FIXME use v->mb_type[]

  5300.     av_freep(&v->luma_mv_base);

  5301.     ff_intrax8_common_end(&v->x8);

  5302.     return 0;

  5303. }

  5304. 

  5305. 

  5306. /** Decode a VC1/WMV3 frame

  5307.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5308.  */

  5309. static int vc1_decode_frame(AVCodecContext *avctx, void *data,

  5310.                             int *got_frame, AVPacket *avpkt)

  5311. {

  5312.     const uint8_t *buf = avpkt->data;

  5313.     int buf_size = avpkt->size, n_slices = 0, i, ret;

  5314.     VC1Context *v = avctx->priv_data;

  5315.     MpegEncContext *s = &v->s;

  5316.     AVFrame *pict = data;

  5317.     uint8_t *buf2 = NULL;

  5318.     const uint8_t *buf_start = buf;

  5319.     int mb_height, n_slices1;

  5320.     struct {

  5321.         uint8_t *buf;

  5322.         GetBitContext gb;

  5323.         int mby_start;

  5324.     } *slices = NULL, *tmp;

  5325. 

  5326.     /* no supplementary picture */

  5327.     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == VC1_CODE_ENDOFSEQ)) {

  5328.         /* special case for last picture */

  5329.         if (s->low_delay == 0 && s->next_picture_ptr) {

  5330.             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)

  5331.                 return ret;

  5332.             s->next_picture_ptr = NULL;

  5333. 

  5334.             *got_frame = 1;

  5335.         }

  5336. 

  5337.         return 0;

  5338.     }

  5339. 

  5340.     if (s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {

  5341.         if (v->profile < PROFILE_ADVANCED)

  5342.             avctx->pix_fmt = AV_PIX_FMT_VDPAU_WMV3;

  5343.         else

  5344.             avctx->pix_fmt = AV_PIX_FMT_VDPAU_VC1;

  5345.     }

  5346. 

  5347.     //for advanced profile we may need to parse and unescape data

  5348.     if (avctx->codec_id == AV_CODEC_ID_VC1 || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5349.         int buf_size2 = 0;

  5350.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5351. 

  5352.         if (IS_MARKER(AV_RB32(buf))) { /* frame starts with marker and needs to be parsed */

  5353.             const uint8_t *start, *end, *next;

  5354.             int size;

  5355. 

  5356.             next = buf;

  5357.             for (start = buf, end = buf + buf_size; next < end; start = next) {

  5358.                 next = find_next_marker(start + 4, end);

  5359.                 size = next - start - 4;

  5360.                 if (size <= 0) continue;

  5361.                 switch (AV_RB32(start)) {

  5362.                 case VC1_CODE_FRAME:

  5363.                     if (avctx->hwaccel ||

  5364.                         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5365.                         buf_start = start;

  5366.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5367.                     break;

  5368.                 case VC1_CODE_FIELD: {

  5369.                     int buf_size3;

  5370.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5371.                     if (!tmp)

  5372.                         goto err;

  5373.                     slices = tmp;

  5374.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5375.                     if (!slices[n_slices].buf)

  5376.                         goto err;

  5377.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5378.                                                     slices[n_slices].buf);

  5379.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5380.                                   buf_size3 << 3);

  5381.                     /* assuming that the field marker is at the exact middle,

  5382.                        hope it's correct */

  5383.                     slices[n_slices].mby_start = s->mb_height >> 1;

  5384.                     n_slices1 = n_slices - 1; // index of the last slice of the first field

  5385.                     n_slices++;

  5386.                     break;

  5387.                 }

  5388.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  5389.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5390.                     init_get_bits(&s->gb, buf2, buf_size2 * 8);

  5391.                     ff_vc1_decode_entry_point(avctx, v, &s->gb);

  5392.                     break;

  5393.                 case VC1_CODE_SLICE: {

  5394.                     int buf_size3;

  5395.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5396.                     if (!tmp)

  5397.                         goto err;

  5398.                     slices = tmp;

  5399.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5400.                     if (!slices[n_slices].buf)

  5401.                         goto err;

  5402.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5403.                                                     slices[n_slices].buf);

  5404.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5405.                                   buf_size3 << 3);

  5406.                     slices[n_slices].mby_start = get_bits(&slices[n_slices].gb, 9);

  5407.                     n_slices++;

  5408.                     break;

  5409.                 }

  5410.                 }

  5411.             }

  5412.         } else if (v->interlace && ((buf[0] & 0xC0) == 0xC0)) { /* WVC1 interlaced stores both fields divided by marker */

  5413.             const uint8_t *divider;

  5414.             int buf_size3;

  5415. 

  5416.             divider = find_next_marker(buf, buf + buf_size);

  5417.             if ((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD) {

  5418.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  5419.                 goto err;

  5420.             } else { // found field marker, unescape second field

  5421.                 tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5422.                 if (!tmp)

  5423.                     goto err;

  5424.                 slices = tmp;

  5425.                 slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5426.                 if (!slices[n_slices].buf)

  5427.                     goto err;

  5428.                 buf_size3 = vc1_unescape_buffer(divider + 4, buf + buf_size - divider - 4, slices[n_slices].buf);

  5429.                 init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5430.                               buf_size3 << 3);

  5431.                 slices[n_slices].mby_start = s->mb_height >> 1;

  5432.                 n_slices1 = n_slices - 1;

  5433.                 n_slices++;

  5434.             }

  5435.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  5436.         } else {

  5437.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  5438.         }

  5439.         init_get_bits(&s->gb, buf2, buf_size2*8);

  5440.     } else

  5441.         init_get_bits(&s->gb, buf, buf_size*8);

  5442. 

  5443.     if (v->res_sprite) {

  5444.         v->new_sprite  = !get_bits1(&s->gb);

  5445.         v->two_sprites =  get_bits1(&s->gb);

  5446.         /* res_sprite means a Windows Media Image stream, AV_CODEC_ID_*IMAGE means

  5447.            we're using the sprite compositor. These are intentionally kept separate

  5448.            so you can get the raw sprites by using the wmv3 decoder for WMVP or

  5449.            the vc1 one for WVP2 */

  5450.         if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5451.             if (v->new_sprite) {

  5452.                 // switch AVCodecContext parameters to those of the sprites

  5453.                 avctx->width  = avctx->coded_width  = v->sprite_width;

  5454.                 avctx->height = avctx->coded_height = v->sprite_height;

  5455.             } else {

  5456.                 goto image;

  5457.             }

  5458.         }

  5459.     }

  5460. 

  5461.     if (s->context_initialized &&

  5462.         (s->width  != avctx->coded_width ||

  5463.          s->height != avctx->coded_height)) {

  5464.         ff_vc1_decode_end(avctx);

  5465.     }

  5466. 

  5467.     if (!s->context_initialized) {

  5468.         if (ff_msmpeg4_decode_init(avctx) < 0 || ff_vc1_decode_init_alloc_tables(v) < 0)

  5469.             goto err;

  5470. 

  5471.         s->low_delay = !avctx->has_b_frames || v->res_sprite;

  5472. 

  5473.         if (v->profile == PROFILE_ADVANCED) {

  5474.             s->h_edge_pos = avctx->coded_width;

  5475.             s->v_edge_pos = avctx->coded_height;

  5476.         }

  5477.     }

  5478. 

  5479.     /* We need to set current_picture_ptr before reading the header,

  5480.      * otherwise we cannot store anything in there. */

  5481.     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {

  5482.         int i = ff_find_unused_picture(s, 0);

  5483.         if (i < 0)

  5484.             goto err;

  5485.         s->current_picture_ptr = &s->picture[i];

  5486.     }

  5487. 

  5488.     // do parse frame header

  5489.     v->pic_header_flag = 0;

  5490.     if (v->profile < PROFILE_ADVANCED) {

  5491.         if (ff_vc1_parse_frame_header(v, &s->gb) == -1) {

  5492.             goto err;

  5493.         }

  5494.     } else {

  5495.         if (ff_vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  5496.             goto err;

  5497.         }

  5498.     }

  5499. 

  5500.     if ((avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE)

  5501.         && s->pict_type != AV_PICTURE_TYPE_I) {

  5502.         av_log(v->s.avctx, AV_LOG_ERROR, "Sprite decoder: expected I-frame\n");

  5503.         goto err;

  5504.     }

  5505. 

  5506.     // process pulldown flags

  5507.     s->current_picture_ptr->f.repeat_pict = 0;

  5508.     // Pulldown flags are only valid when 'broadcast' has been set.

  5509.     // So ticks_per_frame will be 2

  5510.     if (v->rff) {

  5511.         // repeat field

  5512.         s->current_picture_ptr->f.repeat_pict = 1;

  5513.     } else if (v->rptfrm) {

  5514.         // repeat frames

  5515.         s->current_picture_ptr->f.repeat_pict = v->rptfrm * 2;

  5516.     }

  5517. 

  5518.     // for skipping the frame

  5519.     s->current_picture.f.pict_type = s->pict_type;

  5520.     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;

  5521. 

  5522.     /* skip B-frames if we don't have reference frames */

  5523.     if (s->last_picture_ptr == NULL && (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) {

  5524.         goto err;

  5525.     }

  5526.     if ((avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B) ||

  5527.         (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I) ||

  5528.          avctx->skip_frame >= AVDISCARD_ALL) {

  5529.         goto end;

  5530.     }

  5531. 

  5532.     if (s->next_p_frame_damaged) {

  5533.         if (s->pict_type == AV_PICTURE_TYPE_B)

  5534.             goto end;

  5535.         else

  5536.             s->next_p_frame_damaged = 0;

  5537.     }

  5538. 

  5539.     if (ff_MPV_frame_start(s, avctx) < 0) {

  5540.         goto err;

  5541.     }

  5542. 

  5543.     s->me.qpel_put = s->dsp.put_qpel_pixels_tab;

  5544.     s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;

  5545. 

  5546.     if ((CONFIG_VC1_VDPAU_DECODER)

  5547.         &&s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5548.         ff_vdpau_vc1_decode_picture(s, buf_start, (buf + buf_size) - buf_start);

  5549.     else if (avctx->hwaccel) {

  5550.         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)

  5551.             goto err;

  5552.         if (avctx->hwaccel->decode_slice(avctx, buf_start, (buf + buf_size) - buf_start) < 0)

  5553.             goto err;

  5554.         if (avctx->hwaccel->end_frame(avctx) < 0)

  5555.             goto err;

  5556.     } else {

  5557.         ff_mpeg_er_frame_start(s);

  5558. 

  5559.         v->bits = buf_size * 8;

  5560.         v->end_mb_x = s->mb_width;

  5561.         if (v->field_mode) {

  5562.             uint8_t *tmp[2];

  5563.             s->current_picture.f.linesize[0] <<= 1;

  5564.             s->current_picture.f.linesize[1] <<= 1;

  5565.             s->current_picture.f.linesize[2] <<= 1;

  5566.             s->linesize                      <<= 1;

  5567.             s->uvlinesize                    <<= 1;

  5568.             tmp[0]          = v->mv_f_last[0];

  5569.             tmp[1]          = v->mv_f_last[1];

  5570.             v->mv_f_last[0] = v->mv_f_next[0];

  5571.             v->mv_f_last[1] = v->mv_f_next[1];

  5572.             v->mv_f_next[0] = v->mv_f[0];

  5573.             v->mv_f_next[1] = v->mv_f[1];

  5574.             v->mv_f[0] = tmp[0];

  5575.             v->mv_f[1] = tmp[1];

  5576.         }

  5577.         mb_height = s->mb_height >> v->field_mode;

  5578.         for (i = 0; i <= n_slices; i++) {

  5579.             if (i > 0 &&  slices[i - 1].mby_start >= mb_height) {

  5580.                 if (v->field_mode <= 0) {

  5581.                     av_log(v->s.avctx, AV_LOG_ERROR, "Slice %d starts beyond "

  5582.                            "picture boundary (%d >= %d)\n", i,

  5583.                            slices[i - 1].mby_start, mb_height);

  5584.                     continue;

  5585.                 }

  5586.                 v->second_field = 1;

  5587.                 v->blocks_off   = s->mb_width  * s->mb_height << 1;

  5588.                 v->mb_off       = s->mb_stride * s->mb_height >> 1;

  5589.             } else {

  5590.                 v->second_field = 0;

  5591.                 v->blocks_off   = 0;

  5592.                 v->mb_off       = 0;

  5593.             }

  5594.             if (i) {

  5595.                 v->pic_header_flag = 0;

  5596.                 if (v->field_mode && i == n_slices1 + 2) {

  5597.                     if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5598.                         av_log(v->s.avctx, AV_LOG_ERROR, "Field header damaged\n");

  5599.                         continue;

  5600.                     }

  5601.                 } else if (get_bits1(&s->gb)) {

  5602.                     v->pic_header_flag = 1;

  5603.                     if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5604.                         av_log(v->s.avctx, AV_LOG_ERROR, "Slice header damaged\n");

  5605.                         continue;

  5606.                     }

  5607.                 }

  5608.             }

  5609.             s->start_mb_y = (i == 0) ? 0 : FFMAX(0, slices[i-1].mby_start % mb_height);

  5610.             if (!v->field_mode || v->second_field)

  5611.                 s->end_mb_y = (i == n_slices     ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  5612.             else

  5613.                 s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  5614.             ff_vc1_decode_blocks(v);

  5615.             if (i != n_slices)

  5616.                 s->gb = slices[i].gb;

  5617.         }

  5618.         if (v->field_mode) {

  5619.             v->second_field = 0;

  5620.             if (s->pict_type == AV_PICTURE_TYPE_B) {

  5621.                 memcpy(v->mv_f_base, v->mv_f_next_base,

  5622.                        2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5623.             }

  5624.             s->current_picture.f.linesize[0] >>= 1;

  5625.             s->current_picture.f.linesize[1] >>= 1;

  5626.             s->current_picture.f.linesize[2] >>= 1;

  5627.             s->linesize                      >>= 1;

  5628.             s->uvlinesize                    >>= 1;

  5629.         }

  5630.         av_dlog(s->avctx, "Consumed %i/%i bits\n",

  5631.                 get_bits_count(&s->gb), s->gb.size_in_bits);

  5632. //  if (get_bits_count(&s->gb) > buf_size * 8)

  5633. //      return -1;

  5634.         ff_er_frame_end(&s->er);

  5635.     }

  5636. 

  5637.     ff_MPV_frame_end(s);

  5638. 

  5639.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5640. image:

  5641.         avctx->width  = avctx->coded_width  = v->output_width;

  5642.         avctx->height = avctx->coded_height = v->output_height;

  5643.         if (avctx->skip_frame >= AVDISCARD_NONREF)

  5644.             goto end;

  5645. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  5646.         if (vc1_decode_sprites(v, &s->gb))

  5647.             goto err;

  5648. #endif

  5649.         if ((ret = av_frame_ref(pict, &v->sprite_output_frame)) < 0)

  5650.             goto err;

  5651.         *got_frame = 1;

  5652.     } else {

  5653.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  5654.             if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)

  5655.                 goto err;

  5656.             ff_print_debug_info(s, s->current_picture_ptr);

  5657.         } else if (s->last_picture_ptr != NULL) {

  5658.             if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)

  5659.                 goto err;

  5660.             ff_print_debug_info(s, s->last_picture_ptr);

  5661.         }

  5662.         if (s->last_picture_ptr || s->low_delay) {

  5663.             *got_frame = 1;

  5664.         }

  5665.     }

  5666. 

  5667. end:

  5668.     av_free(buf2);

  5669.     for (i = 0; i < n_slices; i++)

  5670.         av_free(slices[i].buf);

  5671.     av_free(slices);

  5672.     return buf_size;

  5673. 

  5674. err:

  5675.     av_free(buf2);

  5676.     for (i = 0; i < n_slices; i++)

  5677.         av_free(slices[i].buf);

  5678.     av_free(slices);

  5679.     return -1;

  5680. }

  5681. 

  5682. 

  5683. static const AVProfile profiles[] = {

  5684.     { FF_PROFILE_VC1_SIMPLE,   "Simple"   },

  5685.     { FF_PROFILE_VC1_MAIN,     "Main"     },

  5686.     { FF_PROFILE_VC1_COMPLEX,  "Complex"  },

  5687.     { FF_PROFILE_VC1_ADVANCED, "Advanced" },

  5688.     { FF_PROFILE_UNKNOWN },

  5689. };

  5690. 

  5691. static const enum AVPixelFormat vc1_hwaccel_pixfmt_list_420[] = {

  5692. #if CONFIG_DXVA2

  5693.     AV_PIX_FMT_DXVA2_VLD,

  5694. #endif

  5695. #if CONFIG_VAAPI

  5696.     AV_PIX_FMT_VAAPI_VLD,

  5697. #endif

  5698. #if CONFIG_VDPAU

  5699.     AV_PIX_FMT_VDPAU,

  5700. #endif

  5701.     AV_PIX_FMT_YUV420P,

  5702.     AV_PIX_FMT_NONE

  5703. };

  5704. 

  5705. AVCodec ff_vc1_decoder = {

  5706.     .name           = "vc1",

  5707.     .type           = AVMEDIA_TYPE_VIDEO,

  5708.     .id             = AV_CODEC_ID_VC1,

  5709.     .priv_data_size = sizeof(VC1Context),

  5710.     .init           = vc1_decode_init,

  5711.     .close          = ff_vc1_decode_end,

  5712.     .decode         = vc1_decode_frame,

  5713.     .flush          = ff_mpeg_flush,

  5714.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  5715.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1"),

  5716.     .pix_fmts       = vc1_hwaccel_pixfmt_list_420,

  5717.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5718. };

  5719. 

  5720. #if CONFIG_WMV3_DECODER

  5721. AVCodec ff_wmv3_decoder = {

  5722.     .name           = "wmv3",

  5723.     .type           = AVMEDIA_TYPE_VIDEO,

  5724.     .id             = AV_CODEC_ID_WMV3,

  5725.     .priv_data_size = sizeof(VC1Context),

  5726.     .init           = vc1_decode_init,

  5727.     .close          = ff_vc1_decode_end,

  5728.     .decode         = vc1_decode_frame,

  5729.     .flush          = ff_mpeg_flush,

  5730.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  5731.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9"),

  5732.     .pix_fmts       = vc1_hwaccel_pixfmt_list_420,

  5733.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5734. };

  5735. #endif

  5736. 

  5737. #if CONFIG_WMV3_VDPAU_DECODER

  5738. AVCodec ff_wmv3_vdpau_decoder = {

  5739.     .name           = "wmv3_vdpau",

  5740.     .type           = AVMEDIA_TYPE_VIDEO,

  5741.     .id             = AV_CODEC_ID_WMV3,

  5742.     .priv_data_size = sizeof(VC1Context),

  5743.     .init           = vc1_decode_init,

  5744.     .close          = ff_vc1_decode_end,

  5745.     .decode         = vc1_decode_frame,

  5746.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,

  5747.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 VDPAU"),

  5748.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_WMV3, AV_PIX_FMT_NONE },

  5749.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5750. };

  5751. #endif

  5752. 

  5753. #if CONFIG_VC1_VDPAU_DECODER

  5754. AVCodec ff_vc1_vdpau_decoder = {

  5755.     .name           = "vc1_vdpau",

  5756.     .type           = AVMEDIA_TYPE_VIDEO,

  5757.     .id             = AV_CODEC_ID_VC1,

  5758.     .priv_data_size = sizeof(VC1Context),

  5759.     .init           = vc1_decode_init,

  5760.     .close          = ff_vc1_decode_end,

  5761.     .decode         = vc1_decode_frame,

  5762.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,

  5763.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1 VDPAU"),

  5764.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_VC1, AV_PIX_FMT_NONE },

  5765.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5766. };

  5767. #endif

  5768. 

  5769. #if CONFIG_WMV3IMAGE_DECODER

  5770. AVCodec ff_wmv3image_decoder = {

  5771.     .name           = "wmv3image",

  5772.     .type           = AVMEDIA_TYPE_VIDEO,

  5773.     .id             = AV_CODEC_ID_WMV3IMAGE,

  5774.     .priv_data_size = sizeof(VC1Context),

  5775.     .init           = vc1_decode_init,

  5776.     .close          = ff_vc1_decode_end,

  5777.     .decode         = vc1_decode_frame,

  5778.     .capabilities   = CODEC_CAP_DR1,

  5779.     .flush          = vc1_sprite_flush,

  5780.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image"),

  5781.     .pix_fmts       = ff_pixfmt_list_420

  5782. };

  5783. #endif

  5784. 

  5785. #if CONFIG_VC1IMAGE_DECODER

  5786. AVCodec ff_vc1image_decoder = {

  5787.     .name           = "vc1image",

  5788.     .type           = AVMEDIA_TYPE_VIDEO,

  5789.     .id             = AV_CODEC_ID_VC1IMAGE,

  5790.     .priv_data_size = sizeof(VC1Context),

  5791.     .init           = vc1_decode_init,

  5792.     .close          = ff_vc1_decode_end,

  5793.     .decode         = vc1_decode_frame,

  5794.     .capabilities   = CODEC_CAP_DR1,

  5795.     .flush          = vc1_sprite_flush,

  5796.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image v2"),

  5797.     .pix_fmts       = ff_pixfmt_list_420

  5798. };

  5799. #endif