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FFmpeg/libavcodec/vc1dec.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2011 Mashiat Sarker Shakkhar

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

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

  6.  *

  7.  * This file is part of FFmpeg.

  8.  *

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

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

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

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

  13.  *

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

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

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

  17.  * Lesser General Public License for more details.

  18.  *

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

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

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

  22.  */

  23. 

  24. /**

  25.  * @file

  26.  * VC-1 and WMV3 decoder

  27.  */

  28. 

  29. #include "internal.h"

  30. #include "dsputil.h"

  31. #include "avcodec.h"

  32. #include "mpegvideo.h"

  33. #include "h263.h"

  34. #include "vc1.h"

  35. #include "vc1data.h"

  36. #include "vc1acdata.h"

  37. #include "msmpeg4data.h"

  38. #include "unary.h"

  39. #include "mathops.h"

  40. #include "vdpau_internal.h"

  41. #include "libavutil/avassert.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.     uint8_t *srcY, *srcU, *srcV;

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

  337.     int off, off_uv;

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

  339. 

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

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

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

  343.         return;

  344. 

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

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

  347. 

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

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

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

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

  352.     }

  353. 

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

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

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

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

  358. 

  359.     if (v->field_mode &&

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

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

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

  363.     }

  364. 

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

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

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

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

  369.     }

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

  371.         if (!dir) {

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

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

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

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

  376.             } else {

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

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

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

  380.             }

  381.         } else {

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

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

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

  385.         }

  386.     } else {

  387.         if (!dir) {

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

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

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

  391.         } else {

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

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

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

  395.         }

  396.     }

  397. 

  398.     if(!srcY)

  399.         return;

  400. 

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

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

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

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

  405. 

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

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

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

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

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

  411.     } else {

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

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

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

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

  416.     }

  417. 

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

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

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

  421. 

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

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

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

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

  426.     }

  427. 

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

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

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

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

  432.     }

  433. 

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

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

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

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

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

  439. 

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

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

  442.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

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

  444.                                  s->h_edge_pos, v_edge_pos);

  445.         srcY = s->edge_emu_buffer;

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

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

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

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

  450.         srcU = uvbuf;

  451.         srcV = uvbuf + 16;

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

  453.         if (v->rangeredfrm) {

  454.             int i, j;

  455.             uint8_t *src, *src2;

  456. 

  457.             src = srcY;

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

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

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

  461.                 src += s->linesize;

  462.             }

  463.             src  = srcU;

  464.             src2 = srcV;

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

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

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

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

  469.                 }

  470.                 src  += s->uvlinesize;

  471.                 src2 += s->uvlinesize;

  472.             }

  473.         }

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

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

  476.             int i, j;

  477.             uint8_t *src, *src2;

  478. 

  479.             src = srcY;

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

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

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

  483.                 src += s->linesize;

  484.             }

  485.             src  = srcU;

  486.             src2 = srcV;

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

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

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

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

  491.                 }

  492.                 src  += s->uvlinesize;

  493.                 src2 += s->uvlinesize;

  494.             }

  495.         }

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

  497.     }

  498. 

  499.     if (v->field_mode && v->second_field) {

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

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

  502.     } else {

  503.         off    = 0;

  504.         off_uv = 0;

  505.     }

  506.     if (s->mspel) {

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

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

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

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

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

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

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

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

  515.         if (!v->rnd)

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

  517.         else

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

  519.     }

  520. 

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

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

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

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

  525.     if (!v->rnd) {

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

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

  528.     } else {

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

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

  531.     }

  532. }

  533. 

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

  535. {

  536.     if (a < b) {

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

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

  539.     } else {

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

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

  542.     }

  543. }

  544. 

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

  546.  */

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

  548. {

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

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

  551.     uint8_t *srcY;

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

  553.     int off;

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

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

  556. 

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

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

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

  560.         return;

  561. 

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

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

  564. 

  565.     if (!dir) {

  566.         if (v->field_mode) {

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

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

  569.             else

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

  571.         } else

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

  573.     } else

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

  575. 

  576.     if(!srcY)

  577.         return;

  578. 

  579.     if (v->field_mode) {

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

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

  582.     }

  583. 

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

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

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

  587.         int tx, ty;

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

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

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

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

  592.             opp_count  += f;

  593.             same_count += 1 - f;

  594.         }

  595.         f = opp_count > same_count;

  596.         switch (f ? opp_count : same_count) {

  597.         case 4:

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

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

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

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

  602.             break;

  603.         case 3:

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

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

  606.             break;

  607.         case 2:

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

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

  610.             break;

  611.         default:

  612.             av_assert2(0);

  613.         }

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

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

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

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

  618.     }

  619. 

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

  621.         int qx, qy;

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

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

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

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

  626. 

  627.         if (qx < -17)

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

  629.         else if (qx > width)

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

  631.         if (qy < -18)

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

  633.         else if (qy > height + 1)

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

  635.     }

  636. 

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

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

  639.     else

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

  641.     if (v->field_mode && v->second_field)

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

  643. 

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

  645.     if (!fieldmv)

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

  647.     else

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

  649. 

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

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

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

  653.     } else {

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

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

  656.             if (src_y & 1)

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

  658.             else

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

  660.         } else {

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

  662.         }

  663.     }

  664. 

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

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

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

  668. 

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

  670.         v_edge_pos--;

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

  672.         src_y--;

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

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

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

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

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

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

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

  680.                                  9 + s->mspel * 2, (9 + s->mspel * 2) << fieldmv,

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

  682.                                  s->h_edge_pos, v_edge_pos);

  683.         srcY = s->edge_emu_buffer;

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

  685.         if (v->rangeredfrm) {

  686.             int i, j;

  687.             uint8_t *src;

  688. 

  689.             src = srcY;

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

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

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

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

  694.             }

  695.         }

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

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

  698.             int i, j;

  699.             uint8_t *src;

  700. 

  701.             src = srcY;

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

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

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

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

  706.             }

  707.         }

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

  709.     }

  710. 

  711.     if (s->mspel) {

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

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

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

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

  716.         if (!v->rnd)

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

  718.         else

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

  720.     }

  721. }

  722. 

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

  724. {

  725.     int idx, i;

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

  727. 

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

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

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

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

  732.     if (!idx) {

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

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

  735.         return 4;

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

  737.         switch (idx) {

  738.         case 0x1:

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

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

  741.             return 3;

  742.         case 0x2:

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

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

  745.             return 3;

  746.         case 0x4:

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

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

  749.             return 3;

  750.         case 0x8:

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

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

  753.             return 3;

  754.         }

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

  756.         int t1 = 0, t2 = 0;

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

  758.             if (!a[i]) {

  759.                 t1 = i;

  760.                 break;

  761.             }

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

  763.             if (!a[i]) {

  764.                 t2 = i;

  765.                 break;

  766.             }

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

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

  769.         return 2;

  770.     } else {

  771.         return 0;

  772.     }

  773.     return -1;

  774. }

  775. 

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

  777.  */

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

  779. {

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

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

  782.     uint8_t *srcU, *srcV;

  783.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

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

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

  786.     int valid_count;

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

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

  789. 

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

  791.         return;

  792.     if (s->flags & CODEC_FLAG_GRAY)

  793.         return;

  794. 

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

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

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

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

  799.         if (v->field_mode)

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

  801.     }

  802. 

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

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

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

  806.         chroma_ref_type = v->reffield;

  807.         if (!valid_count) {

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

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

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

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

  812.         }

  813.     } else {

  814.         int dominant = 0;

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

  816.             dominant = 1;

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

  818.         if (dominant)

  819.             chroma_ref_type = !v->cur_field_type;

  820.     }

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

  822.         return;

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

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

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

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

  827. 

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

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

  830. 

  831.     if (v->fastuvmc) {

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

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

  834.     }

  835.     // Field conversion bias

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

  837.         uvmy += 2 - 4 * chroma_ref_type;

  838. 

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

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

  841. 

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

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

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

  845.     } else {

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

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

  848.     }

  849. 

  850.     if (!dir) {

  851.         if (v->field_mode) {

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

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

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

  855.             } else {

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

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

  858.             }

  859.         } else {

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

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

  862.         }

  863.     } else {

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

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

  866.     }

  867. 

  868.     if(!srcU)

  869.         return;

  870. 

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

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

  873. 

  874.     if (v->field_mode) {

  875.         if (chroma_ref_type) {

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

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

  878.         }

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

  880.     }

  881. 

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

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

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

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

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

  887.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

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

  890.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

  892.         srcU = s->edge_emu_buffer;

  893.         srcV = s->edge_emu_buffer + 16;

  894. 

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

  896.         if (v->rangeredfrm) {

  897.             int i, j;

  898.             uint8_t *src, *src2;

  899. 

  900.             src  = srcU;

  901.             src2 = srcV;

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

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

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

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

  906.                 }

  907.                 src  += s->uvlinesize;

  908.                 src2 += s->uvlinesize;

  909.             }

  910.         }

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

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

  913.             int i, j;

  914.             uint8_t *src, *src2;

  915. 

  916.             src  = srcU;

  917.             src2 = srcV;

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

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

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

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

  922.                 }

  923.                 src  += s->uvlinesize;

  924.                 src2 += s->uvlinesize;

  925.             }

  926.         }

  927.     }

  928. 

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

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

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

  932.     if (!v->rnd) {

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

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

  935.     } else {

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

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

  938.     }

  939. }

  940. 

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

  942.  */

  943. static void vc1_mc_4mv_chroma4(VC1Context *v)

  944. {

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

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

  947.     uint8_t *srcU, *srcV;

  948.     int uvsrc_x, uvsrc_y;

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

  950.     int i, off, tx, ty;

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

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

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

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

  955. 

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

  957.         return;

  958.     if (s->flags & CODEC_FLAG_GRAY)

  959.         return;

  960. 

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

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

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

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

  965.         if (fieldmv)

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

  967.         else

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

  969.     }

  970. 

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

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

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

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

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

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

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

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

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

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

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

  982. 

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

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

  985. 

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

  987.             uvsrc_y--;

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

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

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

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

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

  993.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

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

  996.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

  998.             srcU = s->edge_emu_buffer;

  999.             srcV = s->edge_emu_buffer + 16;

  1000. 

  1001.             /* if we deal with intensity compensation we need to scale source blocks */

  1002.             if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1003.                 int i, j;

  1004.                 uint8_t *src, *src2;

  1005. 

  1006.                 src  = srcU;

  1007.                 src2 = srcV;

  1008.                 for (j = 0; j < 5; j++) {

  1009.                     for (i = 0; i < 5; i++) {

  1010.                         src[i]  = v->lutuv[src[i]];

  1011.                         src2[i] = v->lutuv[src2[i]];

  1012.                     }

  1013.                     src  += s->uvlinesize << 1;

  1014.                     src2 += s->uvlinesize << 1;

  1015.                 }

  1016.             }

  1017.         }

  1018.         if (!v->rnd) {

  1019.             dsp->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1020.             dsp->put_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1021.         } else {

  1022.             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]);

  1023.             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]);

  1024.         }

  1025.     }

  1026. }

  1027. 

  1028. /***********************************************************************/

  1029. /**

  1030.  * @name VC-1 Block-level functions

  1031.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1032.  * @{

  1033.  */

  1034. 

  1035. /**

  1036.  * @def GET_MQUANT

  1037.  * @brief Get macroblock-level quantizer scale

  1038.  */

  1039. #define GET_MQUANT()                                           \

  1040.     if (v->dquantfrm) {                                        \

  1041.         int edges = 0;                                         \

  1042.         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \

  1043.             if (v->dqbilevel) {                                \

  1044.                 mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \

  1045.             } else {                                           \

  1046.                 mqdiff = get_bits(gb, 3);                      \

  1047.                 if (mqdiff != 7)                               \

  1048.                     mquant = v->pq + mqdiff;                   \

  1049.                 else                                           \

  1050.                     mquant = get_bits(gb, 5);                  \

  1051.             }                                                  \

  1052.         }                                                      \

  1053.         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \

  1054.             edges = 1 << v->dqsbedge;                          \

  1055.         else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \

  1056.             edges = (3 << v->dqsbedge) % 15;                   \

  1057.         else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \

  1058.             edges = 15;                                        \

  1059.         if ((edges&1) && !s->mb_x)                             \

  1060.             mquant = v->altpq;                                 \

  1061.         if ((edges&2) && s->first_slice_line)                  \

  1062.             mquant = v->altpq;                                 \

  1063.         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \

  1064.             mquant = v->altpq;                                 \

  1065.         if ((edges&8) && s->mb_y == (s->mb_height - 1))        \

  1066.             mquant = v->altpq;                                 \

  1067.         if (!mquant || mquant > 31) {                          \

  1068.             av_log(v->s.avctx, AV_LOG_ERROR,                   \

  1069.                    "Overriding invalid mquant %d\n", mquant);  \

  1070.             mquant = 1;                                        \

  1071.         }                                                      \

  1072.     }

  1073. 

  1074. /**

  1075.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1076.  * @brief Get MV differentials

  1077.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1078.  * @param _dmv_x Horizontal differential for decoded MV

  1079.  * @param _dmv_y Vertical differential for decoded MV

  1080.  */

  1081. #define GET_MVDATA(_dmv_x, _dmv_y)                                      \

  1082.     index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \

  1083.                          VC1_MV_DIFF_VLC_BITS, 2);                      \

  1084.     if (index > 36) {                                                   \

  1085.         mb_has_coeffs = 1;                                              \

  1086.         index -= 37;                                                    \

  1087.     } else                                                              \

  1088.         mb_has_coeffs = 0;                                              \

  1089.     s->mb_intra = 0;                                                    \

  1090.     if (!index) {                                                       \

  1091.         _dmv_x = _dmv_y = 0;                                            \

  1092.     } else if (index == 35) {                                           \

  1093.         _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1094.         _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1095.     } else if (index == 36) {                                           \

  1096.         _dmv_x = 0;                                                     \

  1097.         _dmv_y = 0;                                                     \

  1098.         s->mb_intra = 1;                                                \

  1099.     } else {                                                            \

  1100.         index1 = index % 6;                                             \

  1101.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1102.         else                                   val = 0;                 \

  1103.         if (size_table[index1] - val > 0)                               \

  1104.             val = get_bits(gb, size_table[index1] - val);               \

  1105.         else                                   val = 0;                 \

  1106.         sign = 0 - (val&1);                                             \

  1107.         _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1108.                                                                         \

  1109.         index1 = index / 6;                                             \

  1110.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1111.         else                                   val = 0;                 \

  1112.         if (size_table[index1] - val > 0)                               \

  1113.             val = get_bits(gb, size_table[index1] - val);               \

  1114.         else                                   val = 0;                 \

  1115.         sign = 0 - (val & 1);                                           \

  1116.         _dmv_y = (sign ^ ((val >> 1) + offset_table[index1])) - sign;   \

  1117.     }

  1118. 

  1119. static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,

  1120.                                                    int *dmv_y, int *pred_flag)

  1121. {

  1122.     int index, index1;

  1123.     int extend_x = 0, extend_y = 0;

  1124.     GetBitContext *gb = &v->s.gb;

  1125.     int bits, esc;

  1126.     int val, sign;

  1127.     const int* offs_tab;

  1128. 

  1129.     if (v->numref) {

  1130.         bits = VC1_2REF_MVDATA_VLC_BITS;

  1131.         esc  = 125;

  1132.     } else {

  1133.         bits = VC1_1REF_MVDATA_VLC_BITS;

  1134.         esc  = 71;

  1135.     }

  1136.     switch (v->dmvrange) {

  1137.     case 1:

  1138.         extend_x = 1;

  1139.         break;

  1140.     case 2:

  1141.         extend_y = 1;

  1142.         break;

  1143.     case 3:

  1144.         extend_x = extend_y = 1;

  1145.         break;

  1146.     }

  1147.     index = get_vlc2(gb, v->imv_vlc->table, bits, 3);

  1148.     if (index == esc) {

  1149.         *dmv_x = get_bits(gb, v->k_x);

  1150.         *dmv_y = get_bits(gb, v->k_y);

  1151.         if (v->numref) {

  1152.             if (pred_flag) {

  1153.                 *pred_flag = *dmv_y & 1;

  1154.                 *dmv_y     = (*dmv_y + *pred_flag) >> 1;

  1155.             } else {

  1156.                 *dmv_y     = (*dmv_y + (*dmv_y & 1)) >> 1;

  1157.             }

  1158.         }

  1159.     }

  1160.     else {

  1161.         av_assert0(index < esc);

  1162.         if (extend_x)

  1163.             offs_tab = offset_table2;

  1164.         else

  1165.             offs_tab = offset_table1;

  1166.         index1 = (index + 1) % 9;

  1167.         if (index1 != 0) {

  1168.             val    = get_bits(gb, index1 + extend_x);

  1169.             sign   = 0 -(val & 1);

  1170.             *dmv_x = (sign ^ ((val >> 1) + offs_tab[index1])) - sign;

  1171.         } else

  1172.             *dmv_x = 0;

  1173.         if (extend_y)

  1174.             offs_tab = offset_table2;

  1175.         else

  1176.             offs_tab = offset_table1;

  1177.         index1 = (index + 1) / 9;

  1178.         if (index1 > v->numref) {

  1179.             val    = get_bits(gb, (index1 + (extend_y << v->numref)) >> v->numref);

  1180.             sign   = 0 - (val & 1);

  1181.             *dmv_y = (sign ^ ((val >> 1) + offs_tab[index1 >> v->numref])) - sign;

  1182.         } else

  1183.             *dmv_y = 0;

  1184.         if (v->numref && pred_flag)

  1185.             *pred_flag = index1 & 1;

  1186.     }

  1187. }

  1188. 

  1189. static av_always_inline int scaleforsame_x(VC1Context *v, int n /* MV */, int dir)

  1190. {

  1191.     int scaledvalue, refdist;

  1192.     int scalesame1, scalesame2;

  1193.     int scalezone1_x, zone1offset_x;

  1194.     int table_index = dir ^ v->second_field;

  1195. 

  1196.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1197.         refdist = v->refdist;

  1198.     else

  1199.         refdist = dir ? v->brfd : v->frfd;

  1200.     if (refdist > 3)

  1201.         refdist = 3;

  1202.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1203.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1204.     scalezone1_x  = ff_vc1_field_mvpred_scales[table_index][3][refdist];

  1205.     zone1offset_x = ff_vc1_field_mvpred_scales[table_index][5][refdist];

  1206. 

  1207.     if (FFABS(n) > 255)

  1208.         scaledvalue = n;

  1209.     else {

  1210.         if (FFABS(n) < scalezone1_x)

  1211.             scaledvalue = (n * scalesame1) >> 8;

  1212.         else {

  1213.             if (n < 0)

  1214.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_x;

  1215.             else

  1216.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_x;

  1217.         }

  1218.     }

  1219.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1220. }

  1221. 

  1222. static av_always_inline int scaleforsame_y(VC1Context *v, int i, int n /* MV */, int dir)

  1223. {

  1224.     int scaledvalue, refdist;

  1225.     int scalesame1, scalesame2;

  1226.     int scalezone1_y, zone1offset_y;

  1227.     int table_index = dir ^ v->second_field;

  1228. 

  1229.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1230.         refdist = v->refdist;

  1231.     else

  1232.         refdist = dir ? v->brfd : v->frfd;

  1233.     if (refdist > 3)

  1234.         refdist = 3;

  1235.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1236.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1237.     scalezone1_y  = ff_vc1_field_mvpred_scales[table_index][4][refdist];

  1238.     zone1offset_y = ff_vc1_field_mvpred_scales[table_index][6][refdist];

  1239. 

  1240.     if (FFABS(n) > 63)

  1241.         scaledvalue = n;

  1242.     else {

  1243.         if (FFABS(n) < scalezone1_y)

  1244.             scaledvalue = (n * scalesame1) >> 8;

  1245.         else {

  1246.             if (n < 0)

  1247.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_y;

  1248.             else

  1249.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_y;

  1250.         }

  1251.     }

  1252. 

  1253.     if (v->cur_field_type && !v->ref_field_type[dir])

  1254.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1255.     else

  1256.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1257. }

  1258. 

  1259. static av_always_inline int scaleforopp_x(VC1Context *v, int n /* MV */)

  1260. {

  1261.     int scalezone1_x, zone1offset_x;

  1262.     int scaleopp1, scaleopp2, brfd;

  1263.     int scaledvalue;

  1264. 

  1265.     brfd = FFMIN(v->brfd, 3);

  1266.     scalezone1_x  = ff_vc1_b_field_mvpred_scales[3][brfd];

  1267.     zone1offset_x = ff_vc1_b_field_mvpred_scales[5][brfd];

  1268.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1269.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1270. 

  1271.     if (FFABS(n) > 255)

  1272.         scaledvalue = n;

  1273.     else {

  1274.         if (FFABS(n) < scalezone1_x)

  1275.             scaledvalue = (n * scaleopp1) >> 8;

  1276.         else {

  1277.             if (n < 0)

  1278.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_x;

  1279.             else

  1280.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_x;

  1281.         }

  1282.     }

  1283.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1284. }

  1285. 

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

  1287. {

  1288.     int scalezone1_y, zone1offset_y;

  1289.     int scaleopp1, scaleopp2, brfd;

  1290.     int scaledvalue;

  1291. 

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

  1293.     scalezone1_y  = ff_vc1_b_field_mvpred_scales[4][brfd];

  1294.     zone1offset_y = ff_vc1_b_field_mvpred_scales[6][brfd];

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

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

  1297. 

  1298.     if (FFABS(n) > 63)

  1299.         scaledvalue = n;

  1300.     else {

  1301.         if (FFABS(n) < scalezone1_y)

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

  1303.         else {

  1304.             if (n < 0)

  1305.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_y;

  1306.             else

  1307.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_y;

  1308.         }

  1309.     }

  1310.     if (v->cur_field_type && !v->ref_field_type[dir]) {

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

  1312.     } else {

  1313.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1314.     }

  1315. }

  1316. 

  1317. static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */,

  1318.                                          int dim, int dir)

  1319. {

  1320.     int brfd, scalesame;

  1321.     int hpel = 1 - v->s.quarter_sample;

  1322. 

  1323.     n >>= hpel;

  1324.     if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {

  1325.         if (dim)

  1326.             n = scaleforsame_y(v, i, n, dir) << hpel;

  1327.         else

  1328.             n = scaleforsame_x(v, n, dir) << hpel;

  1329.         return n;

  1330.     }

  1331.     brfd      = FFMIN(v->brfd, 3);

  1332.     scalesame = ff_vc1_b_field_mvpred_scales[0][brfd];

  1333. 

  1334.     n = (n * scalesame >> 8) << hpel;

  1335.     return n;

  1336. }

  1337. 

  1338. static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */,

  1339.                                         int dim, int dir)

  1340. {

  1341.     int refdist, scaleopp;

  1342.     int hpel = 1 - v->s.quarter_sample;

  1343. 

  1344.     n >>= hpel;

  1345.     if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) {

  1346.         if (dim)

  1347.             n = scaleforopp_y(v, n, dir) << hpel;

  1348.         else

  1349.             n = scaleforopp_x(v, n) << hpel;

  1350.         return n;

  1351.     }

  1352.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1353.         refdist = FFMIN(v->refdist, 3);

  1354.     else

  1355.         refdist = dir ? v->brfd : v->frfd;

  1356.     scaleopp = ff_vc1_field_mvpred_scales[dir ^ v->second_field][0][refdist];

  1357. 

  1358.     n = (n * scaleopp >> 8) << hpel;

  1359.     return n;

  1360. }

  1361. 

  1362. /** Predict and set motion vector

  1363.  */

  1364. static inline void vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,

  1365.                                int mv1, int r_x, int r_y, uint8_t* is_intra,

  1366.                                int pred_flag, int dir)

  1367. {

  1368.     MpegEncContext *s = &v->s;

  1369.     int xy, wrap, off = 0;

  1370.     int16_t *A, *B, *C;

  1371.     int px, py;

  1372.     int sum;

  1373.     int mixedmv_pic, num_samefield = 0, num_oppfield = 0;

  1374.     int opposite, a_f, b_f, c_f;

  1375.     int16_t field_predA[2];

  1376.     int16_t field_predB[2];

  1377.     int16_t field_predC[2];

  1378.     int a_valid, b_valid, c_valid;

  1379.     int hybridmv_thresh, y_bias = 0;

  1380. 

  1381.     if (v->mv_mode == MV_PMODE_MIXED_MV ||

  1382.         ((v->mv_mode == MV_PMODE_INTENSITY_COMP) && (v->mv_mode2 == MV_PMODE_MIXED_MV)))

  1383.         mixedmv_pic = 1;

  1384.     else

  1385.         mixedmv_pic = 0;

  1386.     /* scale MV difference to be quad-pel */

  1387.     dmv_x <<= 1 - s->quarter_sample;

  1388.     dmv_y <<= 1 - s->quarter_sample;

  1389. 

  1390.     wrap = s->b8_stride;

  1391.     xy   = s->block_index[n];

  1392. 

  1393.     if (s->mb_intra) {

  1394.         s->mv[0][n][0] = s->current_picture.f.motion_val[0][xy + v->blocks_off][0] = 0;

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

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

  1397.         s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = 0;

  1398.         if (mv1) { /* duplicate motion data for 1-MV block */

  1399.             s->current_picture.f.motion_val[0][xy + 1 + v->blocks_off][0]        = 0;

  1400.             s->current_picture.f.motion_val[0][xy + 1 + v->blocks_off][1]        = 0;

  1401.             s->current_picture.f.motion_val[0][xy + wrap + v->blocks_off][0]     = 0;

  1402.             s->current_picture.f.motion_val[0][xy + wrap + v->blocks_off][1]     = 0;

  1403.             s->current_picture.f.motion_val[0][xy + wrap + 1 + v->blocks_off][0] = 0;

  1404.             s->current_picture.f.motion_val[0][xy + wrap + 1 + v->blocks_off][1] = 0;

  1405.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  1406.             s->current_picture.f.motion_val[1][xy + 1 + v->blocks_off][0]        = 0;

  1407.             s->current_picture.f.motion_val[1][xy + 1 + v->blocks_off][1]        = 0;

  1408.             s->current_picture.f.motion_val[1][xy + wrap][0]                     = 0;

  1409.             s->current_picture.f.motion_val[1][xy + wrap + v->blocks_off][1]     = 0;

  1410.             s->current_picture.f.motion_val[1][xy + wrap + 1 + v->blocks_off][0] = 0;

  1411.             s->current_picture.f.motion_val[1][xy + wrap + 1 + v->blocks_off][1] = 0;

  1412.         }

  1413.         return;

  1414.     }

  1415. 

  1416.     C = s->current_picture.f.motion_val[dir][xy -    1 + v->blocks_off];

  1417.     A = s->current_picture.f.motion_val[dir][xy - wrap + v->blocks_off];

  1418.     if (mv1) {

  1419.         if (v->field_mode && mixedmv_pic)

  1420.             off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1421.         else

  1422.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1423.     } else {

  1424.         //in 4-MV mode different blocks have different B predictor position

  1425.         switch (n) {

  1426.         case 0:

  1427.             off = (s->mb_x > 0) ? -1 : 1;

  1428.             break;

  1429.         case 1:

  1430.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1431.             break;

  1432.         case 2:

  1433.             off = 1;

  1434.             break;

  1435.         case 3:

  1436.             off = -1;

  1437.         }

  1438.     }

  1439.     B = s->current_picture.f.motion_val[dir][xy - wrap + off + v->blocks_off];

  1440. 

  1441.     a_valid = !s->first_slice_line || (n == 2 || n == 3);

  1442.     b_valid = a_valid && (s->mb_width > 1);

  1443.     c_valid = s->mb_x || (n == 1 || n == 3);

  1444.     if (v->field_mode) {

  1445.         a_valid = a_valid && !is_intra[xy - wrap];

  1446.         b_valid = b_valid && !is_intra[xy - wrap + off];

  1447.         c_valid = c_valid && !is_intra[xy - 1];

  1448.     }

  1449. 

  1450.     if (a_valid) {

  1451.         a_f = v->mv_f[dir][xy - wrap + v->blocks_off];

  1452.         num_oppfield  += a_f;

  1453.         num_samefield += 1 - a_f;

  1454.         field_predA[0] = A[0];

  1455.         field_predA[1] = A[1];

  1456.     } else {

  1457.         field_predA[0] = field_predA[1] = 0;

  1458.         a_f = 0;

  1459.     }

  1460.     if (b_valid) {

  1461.         b_f = v->mv_f[dir][xy - wrap + off + v->blocks_off];

  1462.         num_oppfield  += b_f;

  1463.         num_samefield += 1 - b_f;

  1464.         field_predB[0] = B[0];

  1465.         field_predB[1] = B[1];

  1466.     } else {

  1467.         field_predB[0] = field_predB[1] = 0;

  1468.         b_f = 0;

  1469.     }

  1470.     if (c_valid) {

  1471.         c_f = v->mv_f[dir][xy - 1 + v->blocks_off];

  1472.         num_oppfield  += c_f;

  1473.         num_samefield += 1 - c_f;

  1474.         field_predC[0] = C[0];

  1475.         field_predC[1] = C[1];

  1476.     } else {

  1477.         field_predC[0] = field_predC[1] = 0;

  1478.         c_f = 0;

  1479.     }

  1480. 

  1481.     if (v->field_mode) {

  1482.         if (!v->numref)

  1483.             // REFFIELD determines if the last field or the second-last field is

  1484.             // to be used as reference

  1485.             opposite = 1 - v->reffield;

  1486.         else {

  1487.             if (num_samefield <= num_oppfield)

  1488.                 opposite = 1 - pred_flag;

  1489.             else

  1490.                 opposite = pred_flag;

  1491.         }

  1492.     } else

  1493.         opposite = 0;

  1494.     if (opposite) {

  1495.         if (a_valid && !a_f) {

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

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

  1498.         }

  1499.         if (b_valid && !b_f) {

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

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

  1502.         }

  1503.         if (c_valid && !c_f) {

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

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

  1506.         }

  1507.         v->mv_f[dir][xy + v->blocks_off] = 1;

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

  1509.     } else {

  1510.         if (a_valid && a_f) {

  1511.             field_predA[0] = scaleforsame(v, n, field_predA[0], 0, dir);

  1512.             field_predA[1] = scaleforsame(v, n, field_predA[1], 1, dir);

  1513.         }

  1514.         if (b_valid && b_f) {

  1515.             field_predB[0] = scaleforsame(v, n, field_predB[0], 0, dir);

  1516.             field_predB[1] = scaleforsame(v, n, field_predB[1], 1, dir);

  1517.         }

  1518.         if (c_valid && c_f) {

  1519.             field_predC[0] = scaleforsame(v, n, field_predC[0], 0, dir);

  1520.             field_predC[1] = scaleforsame(v, n, field_predC[1], 1, dir);

  1521.         }

  1522.         v->mv_f[dir][xy + v->blocks_off] = 0;

  1523.         v->ref_field_type[dir] = v->cur_field_type;

  1524.     }

  1525. 

  1526.     if (a_valid) {

  1527.         px = field_predA[0];

  1528.         py = field_predA[1];

  1529.     } else if (c_valid) {

  1530.         px = field_predC[0];

  1531.         py = field_predC[1];

  1532.     } else if (b_valid) {

  1533.         px = field_predB[0];

  1534.         py = field_predB[1];

  1535.     } else {

  1536.         px = 0;

  1537.         py = 0;

  1538.     }

  1539. 

  1540.     if (num_samefield + num_oppfield > 1) {

  1541.         px = mid_pred(field_predA[0], field_predB[0], field_predC[0]);

  1542.         py = mid_pred(field_predA[1], field_predB[1], field_predC[1]);

  1543.     }

  1544. 

  1545.     /* Pullback MV as specified in 8.3.5.3.4 */

  1546.     if (!v->field_mode) {

  1547.         int qx, qy, X, Y;

  1548.         qx = (s->mb_x << 6) + ((n == 1 || n == 3) ? 32 : 0);

  1549.         qy = (s->mb_y << 6) + ((n == 2 || n == 3) ? 32 : 0);

  1550.         X  = (s->mb_width  << 6) - 4;

  1551.         Y  = (s->mb_height << 6) - 4;

  1552.         if (mv1) {

  1553.             if (qx + px < -60) px = -60 - qx;

  1554.             if (qy + py < -60) py = -60 - qy;

  1555.         } else {

  1556.             if (qx + px < -28) px = -28 - qx;

  1557.             if (qy + py < -28) py = -28 - qy;

  1558.         }

  1559.         if (qx + px > X) px = X - qx;

  1560.         if (qy + py > Y) py = Y - qy;

  1561.     }

  1562. 

  1563.     if (!v->field_mode || s->pict_type != AV_PICTURE_TYPE_B) {

  1564.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 (also 10.3.5.4.3.5) */

  1565.         hybridmv_thresh = 32;

  1566.         if (a_valid && c_valid) {

  1567.             if (is_intra[xy - wrap])

  1568.                 sum = FFABS(px) + FFABS(py);

  1569.             else

  1570.                 sum = FFABS(px - field_predA[0]) + FFABS(py - field_predA[1]);

  1571.             if (sum > hybridmv_thresh) {

  1572.                 if (get_bits1(&s->gb)) {     // read HYBRIDPRED bit

  1573.                     px = field_predA[0];

  1574.                     py = field_predA[1];

  1575.                 } else {

  1576.                     px = field_predC[0];

  1577.                     py = field_predC[1];

  1578.                 }

  1579.             } else {

  1580.                 if (is_intra[xy - 1])

  1581.                     sum = FFABS(px) + FFABS(py);

  1582.                 else

  1583.                     sum = FFABS(px - field_predC[0]) + FFABS(py - field_predC[1]);

  1584.                 if (sum > hybridmv_thresh) {

  1585.                     if (get_bits1(&s->gb)) {

  1586.                         px = field_predA[0];

  1587.                         py = field_predA[1];

  1588.                     } else {

  1589.                         px = field_predC[0];

  1590.                         py = field_predC[1];

  1591.                     }

  1592.                 }

  1593.             }

  1594.         }

  1595.     }

  1596. 

  1597.     if (v->field_mode && v->numref)

  1598.         r_y >>= 1;

  1599.     if (v->field_mode && v->cur_field_type && v->ref_field_type[dir] == 0)

  1600.         y_bias = 1;

  1601.     /* store MV using signed modulus of MV range defined in 4.11 */

  1602.     s->mv[dir][n][0] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1603.     s->mv[dir][n][1] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][1] = ((py + dmv_y + r_y - y_bias) & ((r_y << 1) - 1)) - r_y + y_bias;

  1604.     if (mv1) { /* duplicate motion data for 1-MV block */

  1605.         s->current_picture.f.motion_val[dir][xy +    1 +     v->blocks_off][0] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][0];

  1606.         s->current_picture.f.motion_val[dir][xy +    1 +     v->blocks_off][1] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][1];

  1607.         s->current_picture.f.motion_val[dir][xy + wrap +     v->blocks_off][0] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][0];

  1608.         s->current_picture.f.motion_val[dir][xy + wrap +     v->blocks_off][1] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][1];

  1609.         s->current_picture.f.motion_val[dir][xy + wrap + 1 + v->blocks_off][0] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][0];

  1610.         s->current_picture.f.motion_val[dir][xy + wrap + 1 + v->blocks_off][1] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][1];

  1611.         v->mv_f[dir][xy +    1 + v->blocks_off] = v->mv_f[dir][xy +            v->blocks_off];

  1612.         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];

  1613.     }

  1614. }

  1615. 

  1616. /** Predict and set motion vector for interlaced frame picture MBs

  1617.  */

  1618. static inline void vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,

  1619.                                      int mvn, int r_x, int r_y, uint8_t* is_intra)

  1620. {

  1621.     MpegEncContext *s = &v->s;

  1622.     int xy, wrap, off = 0;

  1623.     int A[2], B[2], C[2];

  1624.     int px, py;

  1625.     int a_valid = 0, b_valid = 0, c_valid = 0;

  1626.     int field_a, field_b, field_c; // 0: same, 1: opposit

  1627.     int total_valid, num_samefield, num_oppfield;

  1628.     int pos_c, pos_b, n_adj;

  1629. 

  1630.     wrap = s->b8_stride;

  1631.     xy = s->block_index[n];

  1632. 

  1633.     if (s->mb_intra) {

  1634.         s->mv[0][n][0] = s->current_picture.f.motion_val[0][xy][0] = 0;

  1635.         s->mv[0][n][1] = s->current_picture.f.motion_val[0][xy][1] = 0;

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

  1637.         s->current_picture.f.motion_val[1][xy][1] = 0;

  1638.         if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1639.             s->current_picture.f.motion_val[0][xy + 1][0]        = 0;

  1640.             s->current_picture.f.motion_val[0][xy + 1][1]        = 0;

  1641.             s->current_picture.f.motion_val[0][xy + wrap][0]     = 0;

  1642.             s->current_picture.f.motion_val[0][xy + wrap][1]     = 0;

  1643.             s->current_picture.f.motion_val[0][xy + wrap + 1][0] = 0;

  1644.             s->current_picture.f.motion_val[0][xy + wrap + 1][1] = 0;

  1645.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

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

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

  1648.             s->current_picture.f.motion_val[1][xy + wrap][0]     = 0;

  1649.             s->current_picture.f.motion_val[1][xy + wrap][1]     = 0;

  1650.             s->current_picture.f.motion_val[1][xy + wrap + 1][0] = 0;

  1651.             s->current_picture.f.motion_val[1][xy + wrap + 1][1] = 0;

  1652.         }

  1653.         return;

  1654.     }

  1655. 

  1656.     off = ((n == 0) || (n == 1)) ? 1 : -1;

  1657.     /* predict A */

  1658.     if (s->mb_x || (n == 1) || (n == 3)) {

  1659.         if ((v->blk_mv_type[xy]) // current block (MB) has a field MV

  1660.             || (!v->blk_mv_type[xy] && !v->blk_mv_type[xy - 1])) { // or both have frame MV

  1661.             A[0] = s->current_picture.f.motion_val[0][xy - 1][0];

  1662.             A[1] = s->current_picture.f.motion_val[0][xy - 1][1];

  1663.             a_valid = 1;

  1664.         } else { // current block has frame mv and cand. has field MV (so average)

  1665.             A[0] = (s->current_picture.f.motion_val[0][xy - 1][0]

  1666.                     + s->current_picture.f.motion_val[0][xy - 1 + off * wrap][0] + 1) >> 1;

  1667.             A[1] = (s->current_picture.f.motion_val[0][xy - 1][1]

  1668.                     + s->current_picture.f.motion_val[0][xy - 1 + off * wrap][1] + 1) >> 1;

  1669.             a_valid = 1;

  1670.         }

  1671.         if (!(n & 1) && v->is_intra[s->mb_x - 1]) {

  1672.             a_valid = 0;

  1673.             A[0] = A[1] = 0;

  1674.         }

  1675.     } else

  1676.         A[0] = A[1] = 0;

  1677.     /* Predict B and C */

  1678.     B[0] = B[1] = C[0] = C[1] = 0;

  1679.     if (n == 0 || n == 1 || v->blk_mv_type[xy]) {

  1680.         if (!s->first_slice_line) {

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

  1682.                 b_valid = 1;

  1683.                 n_adj   = n | 2;

  1684.                 pos_b   = s->block_index[n_adj] - 2 * wrap;

  1685.                 if (v->blk_mv_type[pos_b] && v->blk_mv_type[xy]) {

  1686.                     n_adj = (n & 2) | (n & 1);

  1687.                 }

  1688.                 B[0] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap][0];

  1689.                 B[1] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap][1];

  1690.                 if (v->blk_mv_type[pos_b] && !v->blk_mv_type[xy]) {

  1691.                     B[0] = (B[0] + s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap][0] + 1) >> 1;

  1692.                     B[1] = (B[1] + s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap][1] + 1) >> 1;

  1693.                 }

  1694.             }

  1695.             if (s->mb_width > 1) {

  1696.                 if (!v->is_intra[s->mb_x - s->mb_stride + 1]) {

  1697.                     c_valid = 1;

  1698.                     n_adj   = 2;

  1699.                     pos_c   = s->block_index[2] - 2 * wrap + 2;

  1700.                     if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1701.                         n_adj = n & 2;

  1702.                     }

  1703.                     C[0] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap + 2][0];

  1704.                     C[1] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap + 2][1];

  1705.                     if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1706.                         C[0] = (1 + C[0] + (s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap + 2][0])) >> 1;

  1707.                         C[1] = (1 + C[1] + (s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap + 2][1])) >> 1;

  1708.                     }

  1709.                     if (s->mb_x == s->mb_width - 1) {

  1710.                         if (!v->is_intra[s->mb_x - s->mb_stride - 1]) {

  1711.                             c_valid = 1;

  1712.                             n_adj   = 3;

  1713.                             pos_c   = s->block_index[3] - 2 * wrap - 2;

  1714.                             if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1715.                                 n_adj = n | 1;

  1716.                             }

  1717.                             C[0] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap - 2][0];

  1718.                             C[1] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap - 2][1];

  1719.                             if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1720.                                 C[0] = (1 + C[0] + s->current_picture.f.motion_val[0][s->block_index[1] - 2 * wrap - 2][0]) >> 1;

  1721.                                 C[1] = (1 + C[1] + s->current_picture.f.motion_val[0][s->block_index[1] - 2 * wrap - 2][1]) >> 1;

  1722.                             }

  1723.                         } else

  1724.                             c_valid = 0;

  1725.                     }

  1726.                 }

  1727.             }

  1728.         }

  1729.     } else {

  1730.         pos_b   = s->block_index[1];

  1731.         b_valid = 1;

  1732.         B[0]    = s->current_picture.f.motion_val[0][pos_b][0];

  1733.         B[1]    = s->current_picture.f.motion_val[0][pos_b][1];

  1734.         pos_c   = s->block_index[0];

  1735.         c_valid = 1;

  1736.         C[0]    = s->current_picture.f.motion_val[0][pos_c][0];

  1737.         C[1]    = s->current_picture.f.motion_val[0][pos_c][1];

  1738.     }

  1739. 

  1740.     total_valid = a_valid + b_valid + c_valid;

  1741.     // check if predictor A is out of bounds

  1742.     if (!s->mb_x && !(n == 1 || n == 3)) {

  1743.         A[0] = A[1] = 0;

  1744.     }

  1745.     // check if predictor B is out of bounds

  1746.     if ((s->first_slice_line && v->blk_mv_type[xy]) || (s->first_slice_line && !(n & 2))) {

  1747.         B[0] = B[1] = C[0] = C[1] = 0;

  1748.     }

  1749.     if (!v->blk_mv_type[xy]) {

  1750.         if (s->mb_width == 1) {

  1751.             px = B[0];

  1752.             py = B[1];

  1753.         } else {

  1754.             if (total_valid >= 2) {

  1755.                 px = mid_pred(A[0], B[0], C[0]);

  1756.                 py = mid_pred(A[1], B[1], C[1]);

  1757.             } else if (total_valid) {

  1758.                 if      (a_valid) { px = A[0]; py = A[1]; }

  1759.                 else if (b_valid) { px = B[0]; py = B[1]; }

  1760.                 else if (c_valid) { px = C[0]; py = C[1]; }

  1761.                 else av_assert2(0);

  1762.             } else

  1763.                 px = py = 0;

  1764.         }

  1765.     } else {

  1766.         if (a_valid)

  1767.             field_a = (A[1] & 4) ? 1 : 0;

  1768.         else

  1769.             field_a = 0;

  1770.         if (b_valid)

  1771.             field_b = (B[1] & 4) ? 1 : 0;

  1772.         else

  1773.             field_b = 0;

  1774.         if (c_valid)

  1775.             field_c = (C[1] & 4) ? 1 : 0;

  1776.         else

  1777.             field_c = 0;

  1778. 

  1779.         num_oppfield  = field_a + field_b + field_c;

  1780.         num_samefield = total_valid - num_oppfield;

  1781.         if (total_valid == 3) {

  1782.             if ((num_samefield == 3) || (num_oppfield == 3)) {

  1783.                 px = mid_pred(A[0], B[0], C[0]);

  1784.                 py = mid_pred(A[1], B[1], C[1]);

  1785.             } else if (num_samefield >= num_oppfield) {

  1786.                 /* take one MV from same field set depending on priority

  1787.                 the check for B may not be necessary */

  1788.                 px = !field_a ? A[0] : B[0];

  1789.                 py = !field_a ? A[1] : B[1];

  1790.             } else {

  1791.                 px =  field_a ? A[0] : B[0];

  1792.                 py =  field_a ? A[1] : B[1];

  1793.             }

  1794.         } else if (total_valid == 2) {

  1795.             if (num_samefield >= num_oppfield) {

  1796.                 if (!field_a && a_valid) {

  1797.                     px = A[0];

  1798.                     py = A[1];

  1799.                 } else if (!field_b && b_valid) {

  1800.                     px = B[0];

  1801.                     py = B[1];

  1802.                 } else if (c_valid) {

  1803.                     px = C[0];

  1804.                     py = C[1];

  1805.                 } else px = py = 0;

  1806.             } else {

  1807.                 if (field_a && a_valid) {

  1808.                     px = A[0];

  1809.                     py = A[1];

  1810.                 } else if (field_b && b_valid) {

  1811.                     px = B[0];

  1812.                     py = B[1];

  1813.                 } else if (c_valid) {

  1814.                     px = C[0];

  1815.                     py = C[1];

  1816.                 } else px = py = 0;

  1817.             }

  1818.         } else if (total_valid == 1) {

  1819.             px = (a_valid) ? A[0] : ((b_valid) ? B[0] : C[0]);

  1820.             py = (a_valid) ? A[1] : ((b_valid) ? B[1] : C[1]);

  1821.         } else

  1822.             px = py = 0;

  1823.     }

  1824. 

  1825.     /* store MV using signed modulus of MV range defined in 4.11 */

  1826.     s->mv[0][n][0] = s->current_picture.f.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1827.     s->mv[0][n][1] = s->current_picture.f.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1828.     if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1829.         s->current_picture.f.motion_val[0][xy +    1    ][0] = s->current_picture.f.motion_val[0][xy][0];

  1830.         s->current_picture.f.motion_val[0][xy +    1    ][1] = s->current_picture.f.motion_val[0][xy][1];

  1831.         s->current_picture.f.motion_val[0][xy + wrap    ][0] = s->current_picture.f.motion_val[0][xy][0];

  1832.         s->current_picture.f.motion_val[0][xy + wrap    ][1] = s->current_picture.f.motion_val[0][xy][1];

  1833.         s->current_picture.f.motion_val[0][xy + wrap + 1][0] = s->current_picture.f.motion_val[0][xy][0];

  1834.         s->current_picture.f.motion_val[0][xy + wrap + 1][1] = s->current_picture.f.motion_val[0][xy][1];

  1835.     } else if (mvn == 2) { /* duplicate motion data for 2-Field MV block */

  1836.         s->current_picture.f.motion_val[0][xy + 1][0] = s->current_picture.f.motion_val[0][xy][0];

  1837.         s->current_picture.f.motion_val[0][xy + 1][1] = s->current_picture.f.motion_val[0][xy][1];

  1838.         s->mv[0][n + 1][0] = s->mv[0][n][0];

  1839.         s->mv[0][n + 1][1] = s->mv[0][n][1];

  1840.     }

  1841. }

  1842. 

  1843. /** Motion compensation for direct or interpolated blocks in B-frames

  1844.  */

  1845. static void vc1_interp_mc(VC1Context *v)

  1846. {

  1847.     MpegEncContext *s = &v->s;

  1848.     DSPContext *dsp = &v->s.dsp;

  1849.     uint8_t *srcY, *srcU, *srcV;

  1850.     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1851.     int off, off_uv;

  1852.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  1853. 

  1854.     if (!v->field_mode && !v->s.next_picture.f.data[0])

  1855.         return;

  1856. 

  1857.     mx   = s->mv[1][0][0];

  1858.     my   = s->mv[1][0][1];

  1859.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1860.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1861.     if (v->field_mode) {

  1862.         if (v->cur_field_type != v->ref_field_type[1])

  1863.             my   = my   - 2 + 4 * v->cur_field_type;

  1864.             uvmy = uvmy - 2 + 4 * v->cur_field_type;

  1865.     }

  1866.     if (v->fastuvmc) {

  1867.         uvmx = uvmx + ((uvmx < 0) ? -(uvmx & 1) : (uvmx & 1));

  1868.         uvmy = uvmy + ((uvmy < 0) ? -(uvmy & 1) : (uvmy & 1));

  1869.     }

  1870.     srcY = s->next_picture.f.data[0];

  1871.     srcU = s->next_picture.f.data[1];

  1872.     srcV = s->next_picture.f.data[2];

  1873. 

  1874.     src_x   = s->mb_x * 16 + (mx   >> 2);

  1875.     src_y   = s->mb_y * 16 + (my   >> 2);

  1876.     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);

  1877.     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

  1878. 

  1879.     if (v->profile != PROFILE_ADVANCED) {

  1880.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1881.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1882.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1883.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1884.     } else {

  1885.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1886.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1887.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1888.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1889.     }

  1890. 

  1891.     srcY += src_y   * s->linesize   + src_x;

  1892.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1893.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1894. 

  1895.     if (v->field_mode && v->ref_field_type[1]) {

  1896.         srcY += s->current_picture_ptr->f.linesize[0];

  1897.         srcU += s->current_picture_ptr->f.linesize[1];

  1898.         srcV += s->current_picture_ptr->f.linesize[2];

  1899.     }

  1900. 

  1901.     /* for grayscale we should not try to read from unknown area */

  1902.     if (s->flags & CODEC_FLAG_GRAY) {

  1903.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1904.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1905.     }

  1906. 

  1907.     if (v->rangeredfrm || s->h_edge_pos < 22 || v_edge_pos < 22

  1908.         || (unsigned)(src_x - 1) > s->h_edge_pos - (mx & 3) - 16 - 3

  1909.         || (unsigned)(src_y - 1) > v_edge_pos    - (my & 3) - 16 - 3) {

  1910.         uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

  1911. 

  1912.         srcY -= s->mspel * (1 + s->linesize);

  1913.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize,

  1914.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

  1915.                                  src_x - s->mspel, src_y - s->mspel,

  1916.                                  s->h_edge_pos, v_edge_pos);

  1917.         srcY = s->edge_emu_buffer;

  1918.         s->vdsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8 + 1, 8 + 1,

  1919.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1920.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8 + 1, 8 + 1,

  1921.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1922.         srcU = uvbuf;

  1923.         srcV = uvbuf + 16;

  1924.         /* if we deal with range reduction we need to scale source blocks */

  1925.         if (v->rangeredfrm) {

  1926.             int i, j;

  1927.             uint8_t *src, *src2;

  1928. 

  1929.             src = srcY;

  1930.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  1931.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  1932.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1933.                 src += s->linesize;

  1934.             }

  1935.             src = srcU;

  1936.             src2 = srcV;

  1937.             for (j = 0; j < 9; j++) {

  1938.                 for (i = 0; i < 9; i++) {

  1939.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  1940.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1941.                 }

  1942.                 src  += s->uvlinesize;

  1943.                 src2 += s->uvlinesize;

  1944.             }

  1945.         }

  1946.         srcY += s->mspel * (1 + s->linesize);

  1947.     }

  1948. 

  1949.     if (v->field_mode && v->second_field) {

  1950.         off    = s->current_picture_ptr->f.linesize[0];

  1951.         off_uv = s->current_picture_ptr->f.linesize[1];

  1952.     } else {

  1953.         off    = 0;

  1954.         off_uv = 0;

  1955.     }

  1956. 

  1957.     if (s->mspel) {

  1958.         dxy = ((my & 3) << 2) | (mx & 3);

  1959.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);

  1960.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);

  1961.         srcY += s->linesize * 8;

  1962.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  1963.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  1964.     } else { // hpel mc

  1965.         dxy = (my & 2) | ((mx & 2) >> 1);

  1966. 

  1967.         if (!v->rnd)

  1968.             dsp->avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  1969.         else

  1970.             dsp->avg_no_rnd_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize, 16);

  1971.     }

  1972. 

  1973.     if (s->flags & CODEC_FLAG_GRAY) return;

  1974.     /* Chroma MC always uses qpel blilinear */

  1975.     uvmx = (uvmx & 3) << 1;

  1976.     uvmy = (uvmy & 3) << 1;

  1977.     if (!v->rnd) {

  1978.         dsp->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  1979.         dsp->avg_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  1980.     } else {

  1981.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  1982.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  1983.     }

  1984. }

  1985. 

  1986. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1987. {

  1988.     int n = bfrac;

  1989. 

  1990. #if B_FRACTION_DEN==256

  1991.     if (inv)

  1992.         n -= 256;

  1993.     if (!qs)

  1994.         return 2 * ((value * n + 255) >> 9);

  1995.     return (value * n + 128) >> 8;

  1996. #else

  1997.     if (inv)

  1998.         n -= B_FRACTION_DEN;

  1999.     if (!qs)

  2000.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  2001.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  2002. #endif

  2003. }

  2004. 

  2005. /** Reconstruct motion vector for B-frame and do motion compensation

  2006.  */

  2007. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],

  2008.                             int direct, int mode)

  2009. {

  2010.     if (v->use_ic) {

  2011.         v->mv_mode2 = v->mv_mode;

  2012.         v->mv_mode  = MV_PMODE_INTENSITY_COMP;

  2013.     }

  2014.     if (direct) {

  2015.         vc1_mc_1mv(v, 0);

  2016.         vc1_interp_mc(v);

  2017.         if (v->use_ic)

  2018.             v->mv_mode = v->mv_mode2;

  2019.         return;

  2020.     }

  2021.     if (mode == BMV_TYPE_INTERPOLATED) {

  2022.         vc1_mc_1mv(v, 0);

  2023.         vc1_interp_mc(v);

  2024.         if (v->use_ic)

  2025.             v->mv_mode = v->mv_mode2;

  2026.         return;

  2027.     }

  2028. 

  2029.     if (v->use_ic && (mode == BMV_TYPE_BACKWARD))

  2030.         v->mv_mode = v->mv_mode2;

  2031.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  2032.     if (v->use_ic)

  2033.         v->mv_mode = v->mv_mode2;

  2034. }

  2035. 

  2036. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],

  2037.                                  int direct, int mvtype)

  2038. {

  2039.     MpegEncContext *s = &v->s;

  2040.     int xy, wrap, off = 0;

  2041.     int16_t *A, *B, *C;

  2042.     int px, py;

  2043.     int sum;

  2044.     int r_x, r_y;

  2045.     const uint8_t *is_intra = v->mb_type[0];

  2046. 

  2047.     r_x = v->range_x;

  2048.     r_y = v->range_y;

  2049.     /* scale MV difference to be quad-pel */

  2050.     dmv_x[0] <<= 1 - s->quarter_sample;

  2051.     dmv_y[0] <<= 1 - s->quarter_sample;

  2052.     dmv_x[1] <<= 1 - s->quarter_sample;

  2053.     dmv_y[1] <<= 1 - s->quarter_sample;

  2054. 

  2055.     wrap = s->b8_stride;

  2056.     xy = s->block_index[0];

  2057. 

  2058.     if (s->mb_intra) {

  2059.         s->current_picture.f.motion_val[0][xy + v->blocks_off][0] =

  2060.         s->current_picture.f.motion_val[0][xy + v->blocks_off][1] =

  2061.         s->current_picture.f.motion_val[1][xy + v->blocks_off][0] =

  2062.         s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = 0;

  2063.         return;

  2064.     }

  2065.     if (!v->field_mode) {

  2066.         s->mv[0][0][0] = scale_mv(s->next_picture.f.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  2067.         s->mv[0][0][1] = scale_mv(s->next_picture.f.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  2068.         s->mv[1][0][0] = scale_mv(s->next_picture.f.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  2069.         s->mv[1][0][1] = scale_mv(s->next_picture.f.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  2070. 

  2071.         /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  2072.         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));

  2073.         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));

  2074.         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));

  2075.         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));

  2076.     }

  2077.     if (direct) {

  2078.         s->current_picture.f.motion_val[0][xy + v->blocks_off][0] = s->mv[0][0][0];

  2079.         s->current_picture.f.motion_val[0][xy + v->blocks_off][1] = s->mv[0][0][1];

  2080.         s->current_picture.f.motion_val[1][xy + v->blocks_off][0] = s->mv[1][0][0];

  2081.         s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = s->mv[1][0][1];

  2082.         return;

  2083.     }

  2084. 

  2085.     if ((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2086.         C   = s->current_picture.f.motion_val[0][xy - 2];

  2087.         A   = s->current_picture.f.motion_val[0][xy - wrap * 2];

  2088.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2089.         B   = s->current_picture.f.motion_val[0][xy - wrap * 2 + off];

  2090. 

  2091.         if (!s->mb_x) C[0] = C[1] = 0;

  2092.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2093.             if (s->mb_width == 1) {

  2094.                 px = A[0];

  2095.                 py = A[1];

  2096.             } else {

  2097.                 px = mid_pred(A[0], B[0], C[0]);

  2098.                 py = mid_pred(A[1], B[1], C[1]);

  2099.             }

  2100.         } else if (s->mb_x) { // predictor C is not out of bounds

  2101.             px = C[0];

  2102.             py = C[1];

  2103.         } else {

  2104.             px = py = 0;

  2105.         }

  2106.         /* Pullback MV as specified in 8.3.5.3.4 */

  2107.         {

  2108.             int qx, qy, X, Y;

  2109.             if (v->profile < PROFILE_ADVANCED) {

  2110.                 qx = (s->mb_x << 5);

  2111.                 qy = (s->mb_y << 5);

  2112.                 X  = (s->mb_width  << 5) - 4;

  2113.                 Y  = (s->mb_height << 5) - 4;

  2114.                 if (qx + px < -28) px = -28 - qx;

  2115.                 if (qy + py < -28) py = -28 - qy;

  2116.                 if (qx + px > X) px = X - qx;

  2117.                 if (qy + py > Y) py = Y - qy;

  2118.             } else {

  2119.                 qx = (s->mb_x << 6);

  2120.                 qy = (s->mb_y << 6);

  2121.                 X  = (s->mb_width  << 6) - 4;

  2122.                 Y  = (s->mb_height << 6) - 4;

  2123.                 if (qx + px < -60) px = -60 - qx;

  2124.                 if (qy + py < -60) py = -60 - qy;

  2125.                 if (qx + px > X) px = X - qx;

  2126.                 if (qy + py > Y) py = Y - qy;

  2127.             }

  2128.         }

  2129.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2130.         if (0 && !s->first_slice_line && s->mb_x) {

  2131.             if (is_intra[xy - wrap])

  2132.                 sum = FFABS(px) + FFABS(py);

  2133.             else

  2134.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2135.             if (sum > 32) {

  2136.                 if (get_bits1(&s->gb)) {

  2137.                     px = A[0];

  2138.                     py = A[1];

  2139.                 } else {

  2140.                     px = C[0];

  2141.                     py = C[1];

  2142.                 }

  2143.             } else {

  2144.                 if (is_intra[xy - 2])

  2145.                     sum = FFABS(px) + FFABS(py);

  2146.                 else

  2147.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2148.                 if (sum > 32) {

  2149.                     if (get_bits1(&s->gb)) {

  2150.                         px = A[0];

  2151.                         py = A[1];

  2152.                     } else {

  2153.                         px = C[0];

  2154.                         py = C[1];

  2155.                     }

  2156.                 }

  2157.             }

  2158.         }

  2159.         /* store MV using signed modulus of MV range defined in 4.11 */

  2160.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2161.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2162.     }

  2163.     if ((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2164.         C   = s->current_picture.f.motion_val[1][xy - 2];

  2165.         A   = s->current_picture.f.motion_val[1][xy - wrap * 2];

  2166.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2167.         B   = s->current_picture.f.motion_val[1][xy - wrap * 2 + off];

  2168. 

  2169.         if (!s->mb_x)

  2170.             C[0] = C[1] = 0;

  2171.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2172.             if (s->mb_width == 1) {

  2173.                 px = A[0];

  2174.                 py = A[1];

  2175.             } else {

  2176.                 px = mid_pred(A[0], B[0], C[0]);

  2177.                 py = mid_pred(A[1], B[1], C[1]);

  2178.             }

  2179.         } else if (s->mb_x) { // predictor C is not out of bounds

  2180.             px = C[0];

  2181.             py = C[1];

  2182.         } else {

  2183.             px = py = 0;

  2184.         }

  2185.         /* Pullback MV as specified in 8.3.5.3.4 */

  2186.         {

  2187.             int qx, qy, X, Y;

  2188.             if (v->profile < PROFILE_ADVANCED) {

  2189.                 qx = (s->mb_x << 5);

  2190.                 qy = (s->mb_y << 5);

  2191.                 X  = (s->mb_width  << 5) - 4;

  2192.                 Y  = (s->mb_height << 5) - 4;

  2193.                 if (qx + px < -28) px = -28 - qx;

  2194.                 if (qy + py < -28) py = -28 - qy;

  2195.                 if (qx + px > X) px = X - qx;

  2196.                 if (qy + py > Y) py = Y - qy;

  2197.             } else {

  2198.                 qx = (s->mb_x << 6);

  2199.                 qy = (s->mb_y << 6);

  2200.                 X  = (s->mb_width  << 6) - 4;

  2201.                 Y  = (s->mb_height << 6) - 4;

  2202.                 if (qx + px < -60) px = -60 - qx;

  2203.                 if (qy + py < -60) py = -60 - qy;

  2204.                 if (qx + px > X) px = X - qx;

  2205.                 if (qy + py > Y) py = Y - qy;

  2206.             }

  2207.         }

  2208.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2209.         if (0 && !s->first_slice_line && s->mb_x) {

  2210.             if (is_intra[xy - wrap])

  2211.                 sum = FFABS(px) + FFABS(py);

  2212.             else

  2213.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2214.             if (sum > 32) {

  2215.                 if (get_bits1(&s->gb)) {

  2216.                     px = A[0];

  2217.                     py = A[1];

  2218.                 } else {

  2219.                     px = C[0];

  2220.                     py = C[1];

  2221.                 }

  2222.             } else {

  2223.                 if (is_intra[xy - 2])

  2224.                     sum = FFABS(px) + FFABS(py);

  2225.                 else

  2226.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2227.                 if (sum > 32) {

  2228.                     if (get_bits1(&s->gb)) {

  2229.                         px = A[0];

  2230.                         py = A[1];

  2231.                     } else {

  2232.                         px = C[0];

  2233.                         py = C[1];

  2234.                     }

  2235.                 }

  2236.             }

  2237.         }

  2238.         /* store MV using signed modulus of MV range defined in 4.11 */

  2239. 

  2240.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2241.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2242.     }

  2243.     s->current_picture.f.motion_val[0][xy][0] = s->mv[0][0][0];

  2244.     s->current_picture.f.motion_val[0][xy][1] = s->mv[0][0][1];

  2245.     s->current_picture.f.motion_val[1][xy][0] = s->mv[1][0][0];

  2246.     s->current_picture.f.motion_val[1][xy][1] = s->mv[1][0][1];

  2247. }

  2248. 

  2249. static inline void vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y, int mv1, int *pred_flag)

  2250. {

  2251.     int dir = (v->bmvtype == BMV_TYPE_BACKWARD) ? 1 : 0;

  2252.     MpegEncContext *s = &v->s;

  2253.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2254. 

  2255.     if (v->bmvtype == BMV_TYPE_DIRECT) {

  2256.         int total_opp, k, f;

  2257.         if (s->next_picture.f.mb_type[mb_pos + v->mb_off] != MB_TYPE_INTRA) {

  2258.             s->mv[0][0][0] = scale_mv(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2259.                                       v->bfraction, 0, s->quarter_sample);

  2260.             s->mv[0][0][1] = scale_mv(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2261.                                       v->bfraction, 0, s->quarter_sample);

  2262.             s->mv[1][0][0] = scale_mv(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2263.                                       v->bfraction, 1, s->quarter_sample);

  2264.             s->mv[1][0][1] = scale_mv(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2265.                                       v->bfraction, 1, s->quarter_sample);

  2266. 

  2267.             total_opp = v->mv_f_next[0][s->block_index[0] + v->blocks_off]

  2268.                       + v->mv_f_next[0][s->block_index[1] + v->blocks_off]

  2269.                       + v->mv_f_next[0][s->block_index[2] + v->blocks_off]

  2270.                       + v->mv_f_next[0][s->block_index[3] + v->blocks_off];

  2271.             f = (total_opp > 2) ? 1 : 0;

  2272.         } else {

  2273.             s->mv[0][0][0] = s->mv[0][0][1] = 0;

  2274.             s->mv[1][0][0] = s->mv[1][0][1] = 0;

  2275.             f = 0;

  2276.         }

  2277.         v->ref_field_type[0] = v->ref_field_type[1] = v->cur_field_type ^ f;

  2278.         for (k = 0; k < 4; k++) {

  2279.             s->current_picture.f.motion_val[0][s->block_index[k] + v->blocks_off][0] = s->mv[0][0][0];

  2280.             s->current_picture.f.motion_val[0][s->block_index[k] + v->blocks_off][1] = s->mv[0][0][1];

  2281.             s->current_picture.f.motion_val[1][s->block_index[k] + v->blocks_off][0] = s->mv[1][0][0];

  2282.             s->current_picture.f.motion_val[1][s->block_index[k] + v->blocks_off][1] = s->mv[1][0][1];

  2283.             v->mv_f[0][s->block_index[k] + v->blocks_off] = f;

  2284.             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;

  2285.         }

  2286.         return;

  2287.     }

  2288.     if (v->bmvtype == BMV_TYPE_INTERPOLATED) {

  2289.         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);

  2290.         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);

  2291.         return;

  2292.     }

  2293.     if (dir) { // backward

  2294.         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);

  2295.         if (n == 3 || mv1) {

  2296.             vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0],   1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  2297.         }

  2298.     } else { // forward

  2299.         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);

  2300.         if (n == 3 || mv1) {

  2301.             vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1],   1, v->range_x, v->range_y, v->mb_type[0], 0, 1);

  2302.         }

  2303.     }

  2304. }

  2305. 

  2306. /** Get predicted DC value for I-frames only

  2307.  * prediction dir: left=0, top=1

  2308.  * @param s MpegEncContext

  2309.  * @param overlap flag indicating that overlap filtering is used

  2310.  * @param pq integer part of picture quantizer

  2311.  * @param[in] n block index in the current MB

  2312.  * @param dc_val_ptr Pointer to DC predictor

  2313.  * @param dir_ptr Prediction direction for use in AC prediction

  2314.  */

  2315. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2316.                                 int16_t **dc_val_ptr, int *dir_ptr)

  2317. {

  2318.     int a, b, c, wrap, pred, scale;

  2319.     int16_t *dc_val;

  2320.     static const uint16_t dcpred[32] = {

  2321.         -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2322.              114,  102,   93,   85,   79,   73,   68,   64,

  2323.               60,   57,   54,   51,   49,   47,   45,   43,

  2324.               41,   39,   38,   37,   35,   34,   33

  2325.     };

  2326. 

  2327.     /* find prediction - wmv3_dc_scale always used here in fact */

  2328.     if (n < 4) scale = s->y_dc_scale;

  2329.     else       scale = s->c_dc_scale;

  2330. 

  2331.     wrap   = s->block_wrap[n];

  2332.     dc_val = s->dc_val[0] + s->block_index[n];

  2333. 

  2334.     /* B A

  2335.      * C X

  2336.      */

  2337.     c = dc_val[ - 1];

  2338.     b = dc_val[ - 1 - wrap];

  2339.     a = dc_val[ - wrap];

  2340. 

  2341.     if (pq < 9 || !overlap) {

  2342.         /* Set outer values */

  2343.         if (s->first_slice_line && (n != 2 && n != 3))

  2344.             b = a = dcpred[scale];

  2345.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2346.             b = c = dcpred[scale];

  2347.     } else {

  2348.         /* Set outer values */

  2349.         if (s->first_slice_line && (n != 2 && n != 3))

  2350.             b = a = 0;

  2351.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2352.             b = c = 0;

  2353.     }

  2354. 

  2355.     if (abs(a - b) <= abs(b - c)) {

  2356.         pred     = c;

  2357.         *dir_ptr = 1; // left

  2358.     } else {

  2359.         pred     = a;

  2360.         *dir_ptr = 0; // top

  2361.     }

  2362. 

  2363.     /* update predictor */

  2364.     *dc_val_ptr = &dc_val[0];

  2365.     return pred;

  2366. }

  2367. 

  2368. 

  2369. /** Get predicted DC value

  2370.  * prediction dir: left=0, top=1

  2371.  * @param s MpegEncContext

  2372.  * @param overlap flag indicating that overlap filtering is used

  2373.  * @param pq integer part of picture quantizer

  2374.  * @param[in] n block index in the current MB

  2375.  * @param a_avail flag indicating top block availability

  2376.  * @param c_avail flag indicating left block availability

  2377.  * @param dc_val_ptr Pointer to DC predictor

  2378.  * @param dir_ptr Prediction direction for use in AC prediction

  2379.  */

  2380. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2381.                               int a_avail, int c_avail,

  2382.                               int16_t **dc_val_ptr, int *dir_ptr)

  2383. {

  2384.     int a, b, c, wrap, pred;

  2385.     int16_t *dc_val;

  2386.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2387.     int q1, q2 = 0;

  2388.     int dqscale_index;

  2389. 

  2390.     wrap = s->block_wrap[n];

  2391.     dc_val = s->dc_val[0] + s->block_index[n];

  2392. 

  2393.     /* B A

  2394.      * C X

  2395.      */

  2396.     c = dc_val[ - 1];

  2397.     b = dc_val[ - 1 - wrap];

  2398.     a = dc_val[ - wrap];

  2399.     /* scale predictors if needed */

  2400.     q1 = s->current_picture.f.qscale_table[mb_pos];

  2401.     dqscale_index = s->y_dc_scale_table[q1] - 1;

  2402.     if (dqscale_index < 0)

  2403.         return 0;

  2404.     if (c_avail && (n != 1 && n != 3)) {

  2405.         q2 = s->current_picture.f.qscale_table[mb_pos - 1];

  2406.         if (q2 && q2 != q1)

  2407.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2408.     }

  2409.     if (a_avail && (n != 2 && n != 3)) {

  2410.         q2 = s->current_picture.f.qscale_table[mb_pos - s->mb_stride];

  2411.         if (q2 && q2 != q1)

  2412.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2413.     }

  2414.     if (a_avail && c_avail && (n != 3)) {

  2415.         int off = mb_pos;

  2416.         if (n != 1)

  2417.             off--;

  2418.         if (n != 2)

  2419.             off -= s->mb_stride;

  2420.         q2 = s->current_picture.f.qscale_table[off];

  2421.         if (q2 && q2 != q1)

  2422.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2423.     }

  2424. 

  2425.     if (a_avail && c_avail) {

  2426.         if (abs(a - b) <= abs(b - c)) {

  2427.             pred     = c;

  2428.             *dir_ptr = 1; // left

  2429.         } else {

  2430.             pred     = a;

  2431.             *dir_ptr = 0; // top

  2432.         }

  2433.     } else if (a_avail) {

  2434.         pred     = a;

  2435.         *dir_ptr = 0; // top

  2436.     } else if (c_avail) {

  2437.         pred     = c;

  2438.         *dir_ptr = 1; // left

  2439.     } else {

  2440.         pred     = 0;

  2441.         *dir_ptr = 1; // left

  2442.     }

  2443. 

  2444.     /* update predictor */

  2445.     *dc_val_ptr = &dc_val[0];

  2446.     return pred;

  2447. }

  2448. 

  2449. /** @} */ // Block group

  2450. 

  2451. /**

  2452.  * @name VC1 Macroblock-level functions in Simple/Main Profiles

  2453.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2454.  * @{

  2455.  */

  2456. 

  2457. static inline int vc1_coded_block_pred(MpegEncContext * s, int n,

  2458.                                        uint8_t **coded_block_ptr)

  2459. {

  2460.     int xy, wrap, pred, a, b, c;

  2461. 

  2462.     xy   = s->block_index[n];

  2463.     wrap = s->b8_stride;

  2464. 

  2465.     /* B C

  2466.      * A X

  2467.      */

  2468.     a = s->coded_block[xy - 1       ];

  2469.     b = s->coded_block[xy - 1 - wrap];

  2470.     c = s->coded_block[xy     - wrap];

  2471. 

  2472.     if (b == c) {

  2473.         pred = a;

  2474.     } else {

  2475.         pred = c;

  2476.     }

  2477. 

  2478.     /* store value */

  2479.     *coded_block_ptr = &s->coded_block[xy];

  2480. 

  2481.     return pred;

  2482. }

  2483. 

  2484. /**

  2485.  * Decode one AC coefficient

  2486.  * @param v The VC1 context

  2487.  * @param last Last coefficient

  2488.  * @param skip How much zero coefficients to skip

  2489.  * @param value Decoded AC coefficient value

  2490.  * @param codingset set of VLC to decode data

  2491.  * @see 8.1.3.4

  2492.  */

  2493. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,

  2494.                                 int *value, int codingset)

  2495. {

  2496.     GetBitContext *gb = &v->s.gb;

  2497.     int index, escape, run = 0, level = 0, lst = 0;

  2498. 

  2499.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2500.     if (index != ff_vc1_ac_sizes[codingset] - 1) {

  2501.         run   = vc1_index_decode_table[codingset][index][0];

  2502.         level = vc1_index_decode_table[codingset][index][1];

  2503.         lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;

  2504.         if (get_bits1(gb))

  2505.             level = -level;

  2506.     } else {

  2507.         escape = decode210(gb);

  2508.         if (escape != 2) {

  2509.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2510.             run   = vc1_index_decode_table[codingset][index][0];

  2511.             level = vc1_index_decode_table[codingset][index][1];

  2512.             lst   = index >= vc1_last_decode_table[codingset];

  2513.             if (escape == 0) {

  2514.                 if (lst)

  2515.                     level += vc1_last_delta_level_table[codingset][run];

  2516.                 else

  2517.                     level += vc1_delta_level_table[codingset][run];

  2518.             } else {

  2519.                 if (lst)

  2520.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2521.                 else

  2522.                     run += vc1_delta_run_table[codingset][level] + 1;

  2523.             }

  2524.             if (get_bits1(gb))

  2525.                 level = -level;

  2526.         } else {

  2527.             int sign;

  2528.             lst = get_bits1(gb);

  2529.             if (v->s.esc3_level_length == 0) {

  2530.                 if (v->pq < 8 || v->dquantfrm) { // table 59

  2531.                     v->s.esc3_level_length = get_bits(gb, 3);

  2532.                     if (!v->s.esc3_level_length)

  2533.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2534.                 } else { // table 60

  2535.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  2536.                 }

  2537.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2538.             }

  2539.             run   = get_bits(gb, v->s.esc3_run_length);

  2540.             sign  = get_bits1(gb);

  2541.             level = get_bits(gb, v->s.esc3_level_length);

  2542.             if (sign)

  2543.                 level = -level;

  2544.         }

  2545.     }

  2546. 

  2547.     *last  = lst;

  2548.     *skip  = run;

  2549.     *value = level;

  2550. }

  2551. 

  2552. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2553.  * @param v VC1Context

  2554.  * @param block block to decode

  2555.  * @param[in] n subblock index

  2556.  * @param coded are AC coeffs present or not

  2557.  * @param codingset set of VLC to decode data

  2558.  */

  2559. static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,

  2560.                               int coded, int codingset)

  2561. {

  2562.     GetBitContext *gb = &v->s.gb;

  2563.     MpegEncContext *s = &v->s;

  2564.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2565.     int i;

  2566.     int16_t *dc_val;

  2567.     int16_t *ac_val, *ac_val2;

  2568.     int dcdiff;

  2569. 

  2570.     /* Get DC differential */

  2571.     if (n < 4) {

  2572.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2573.     } else {

  2574.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2575.     }

  2576.     if (dcdiff < 0) {

  2577.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2578.         return -1;

  2579.     }

  2580.     if (dcdiff) {

  2581.         if (dcdiff == 119 /* ESC index value */) {

  2582.             /* TODO: Optimize */

  2583.             if (v->pq == 1)      dcdiff = get_bits(gb, 10);

  2584.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2585.             else                 dcdiff = get_bits(gb, 8);

  2586.         } else {

  2587.             if (v->pq == 1)

  2588.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2589.             else if (v->pq == 2)

  2590.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2591.         }

  2592.         if (get_bits1(gb))

  2593.             dcdiff = -dcdiff;

  2594.     }

  2595. 

  2596.     /* Prediction */

  2597.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2598.     *dc_val = dcdiff;

  2599. 

  2600.     /* Store the quantized DC coeff, used for prediction */

  2601.     if (n < 4) {

  2602.         block[0] = dcdiff * s->y_dc_scale;

  2603.     } else {

  2604.         block[0] = dcdiff * s->c_dc_scale;

  2605.     }

  2606.     /* Skip ? */

  2607.     if (!coded) {

  2608.         goto not_coded;

  2609.     }

  2610. 

  2611.     // AC Decoding

  2612.     i = 1;

  2613. 

  2614.     {

  2615.         int last = 0, skip, value;

  2616.         const uint8_t *zz_table;

  2617.         int scale;

  2618.         int k;

  2619. 

  2620.         scale = v->pq * 2 + v->halfpq;

  2621. 

  2622.         if (v->s.ac_pred) {

  2623.             if (!dc_pred_dir)

  2624.                 zz_table = v->zz_8x8[2];

  2625.             else

  2626.                 zz_table = v->zz_8x8[3];

  2627.         } else

  2628.             zz_table = v->zz_8x8[1];

  2629. 

  2630.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2631.         ac_val2 = ac_val;

  2632.         if (dc_pred_dir) // left

  2633.             ac_val -= 16;

  2634.         else // top

  2635.             ac_val -= 16 * s->block_wrap[n];

  2636. 

  2637.         while (!last) {

  2638.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2639.             i += skip;

  2640.             if (i > 63)

  2641.                 break;

  2642.             block[zz_table[i++]] = value;

  2643.         }

  2644. 

  2645.         /* apply AC prediction if needed */

  2646.         if (s->ac_pred) {

  2647.             if (dc_pred_dir) { // left

  2648.                 for (k = 1; k < 8; k++)

  2649.                     block[k << v->left_blk_sh] += ac_val[k];

  2650.             } else { // top

  2651.                 for (k = 1; k < 8; k++)

  2652.                     block[k << v->top_blk_sh] += ac_val[k + 8];

  2653.             }

  2654.         }

  2655.         /* save AC coeffs for further prediction */

  2656.         for (k = 1; k < 8; k++) {

  2657.             ac_val2[k]     = block[k << v->left_blk_sh];

  2658.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2659.         }

  2660. 

  2661.         /* scale AC coeffs */

  2662.         for (k = 1; k < 64; k++)

  2663.             if (block[k]) {

  2664.                 block[k] *= scale;

  2665.                 if (!v->pquantizer)

  2666.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2667.             }

  2668. 

  2669.         if (s->ac_pred) i = 63;

  2670.     }

  2671. 

  2672. not_coded:

  2673.     if (!coded) {

  2674.         int k, scale;

  2675.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2676.         ac_val2 = ac_val;

  2677. 

  2678.         i = 0;

  2679.         scale = v->pq * 2 + v->halfpq;

  2680.         memset(ac_val2, 0, 16 * 2);

  2681.         if (dc_pred_dir) { // left

  2682.             ac_val -= 16;

  2683.             if (s->ac_pred)

  2684.                 memcpy(ac_val2, ac_val, 8 * 2);

  2685.         } else { // top

  2686.             ac_val -= 16 * s->block_wrap[n];

  2687.             if (s->ac_pred)

  2688.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2689.         }

  2690. 

  2691.         /* apply AC prediction if needed */

  2692.         if (s->ac_pred) {

  2693.             if (dc_pred_dir) { //left

  2694.                 for (k = 1; k < 8; k++) {

  2695.                     block[k << v->left_blk_sh] = ac_val[k] * scale;

  2696.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2697.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -v->pq : v->pq;

  2698.                 }

  2699.             } else { // top

  2700.                 for (k = 1; k < 8; k++) {

  2701.                     block[k << v->top_blk_sh] = ac_val[k + 8] * scale;

  2702.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2703.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -v->pq : v->pq;

  2704.                 }

  2705.             }

  2706.             i = 63;

  2707.         }

  2708.     }

  2709.     s->block_last_index[n] = i;

  2710. 

  2711.     return 0;

  2712. }

  2713. 

  2714. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2715.  * @param v VC1Context

  2716.  * @param block block to decode

  2717.  * @param[in] n subblock number

  2718.  * @param coded are AC coeffs present or not

  2719.  * @param codingset set of VLC to decode data

  2720.  * @param mquant quantizer value for this macroblock

  2721.  */

  2722. static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,

  2723.                                   int coded, int codingset, int mquant)

  2724. {

  2725.     GetBitContext *gb = &v->s.gb;

  2726.     MpegEncContext *s = &v->s;

  2727.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2728.     int i;

  2729.     int16_t *dc_val;

  2730.     int16_t *ac_val, *ac_val2;

  2731.     int dcdiff;

  2732.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2733.     int use_pred = s->ac_pred;

  2734.     int scale;

  2735.     int q1, q2 = 0;

  2736.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2737. 

  2738.     /* Get DC differential */

  2739.     if (n < 4) {

  2740.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2741.     } else {

  2742.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2743.     }

  2744.     if (dcdiff < 0) {

  2745.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2746.         return -1;

  2747.     }

  2748.     if (dcdiff) {

  2749.         if (dcdiff == 119 /* ESC index value */) {

  2750.             /* TODO: Optimize */

  2751.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  2752.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2753.             else                  dcdiff = get_bits(gb, 8);

  2754.         } else {

  2755.             if (mquant == 1)

  2756.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2757.             else if (mquant == 2)

  2758.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2759.         }

  2760.         if (get_bits1(gb))

  2761.             dcdiff = -dcdiff;

  2762.     }

  2763. 

  2764.     /* Prediction */

  2765.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2766.     *dc_val = dcdiff;

  2767. 

  2768.     /* Store the quantized DC coeff, used for prediction */

  2769.     if (n < 4) {

  2770.         block[0] = dcdiff * s->y_dc_scale;

  2771.     } else {

  2772.         block[0] = dcdiff * s->c_dc_scale;

  2773.     }

  2774. 

  2775.     //AC Decoding

  2776.     i = 1;

  2777. 

  2778.     /* check if AC is needed at all */

  2779.     if (!a_avail && !c_avail)

  2780.         use_pred = 0;

  2781.     ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2782.     ac_val2 = ac_val;

  2783. 

  2784.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  2785. 

  2786.     if (dc_pred_dir) // left

  2787.         ac_val -= 16;

  2788.     else // top

  2789.         ac_val -= 16 * s->block_wrap[n];

  2790. 

  2791.     q1 = s->current_picture.f.qscale_table[mb_pos];

  2792.     if ( dc_pred_dir && c_avail && mb_pos)

  2793.         q2 = s->current_picture.f.qscale_table[mb_pos - 1];

  2794.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  2795.         q2 = s->current_picture.f.qscale_table[mb_pos - s->mb_stride];

  2796.     if ( dc_pred_dir && n == 1)

  2797.         q2 = q1;

  2798.     if (!dc_pred_dir && n == 2)

  2799.         q2 = q1;

  2800.     if (n == 3)

  2801.         q2 = q1;

  2802. 

  2803.     if (coded) {

  2804.         int last = 0, skip, value;

  2805.         const uint8_t *zz_table;

  2806.         int k;

  2807. 

  2808.         if (v->s.ac_pred) {

  2809.             if (!use_pred && v->fcm == ILACE_FRAME) {

  2810.                 zz_table = v->zzi_8x8;

  2811.             } else {

  2812.                 if (!dc_pred_dir) // top

  2813.                     zz_table = v->zz_8x8[2];

  2814.                 else // left

  2815.                     zz_table = v->zz_8x8[3];

  2816.             }

  2817.         } else {

  2818.             if (v->fcm != ILACE_FRAME)

  2819.                 zz_table = v->zz_8x8[1];

  2820.             else

  2821.                 zz_table = v->zzi_8x8;

  2822.         }

  2823. 

  2824.         while (!last) {

  2825.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2826.             i += skip;

  2827.             if (i > 63)

  2828.                 break;

  2829.             block[zz_table[i++]] = value;

  2830.         }

  2831. 

  2832.         /* apply AC prediction if needed */

  2833.         if (use_pred) {

  2834.             /* scale predictors if needed*/

  2835.             if (q2 && q1 != q2) {

  2836.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2837.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2838. 

  2839.                 if (q1 < 1)

  2840.                     return AVERROR_INVALIDDATA;

  2841.                 if (dc_pred_dir) { // left

  2842.                     for (k = 1; k < 8; k++)

  2843.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2844.                 } else { // top

  2845.                     for (k = 1; k < 8; k++)

  2846.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2847.                 }

  2848.             } else {

  2849.                 if (dc_pred_dir) { //left

  2850.                     for (k = 1; k < 8; k++)

  2851.                         block[k << v->left_blk_sh] += ac_val[k];

  2852.                 } else { //top

  2853.                     for (k = 1; k < 8; k++)

  2854.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  2855.                 }

  2856.             }

  2857.         }

  2858.         /* save AC coeffs for further prediction */

  2859.         for (k = 1; k < 8; k++) {

  2860.             ac_val2[k    ] = block[k << v->left_blk_sh];

  2861.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2862.         }

  2863. 

  2864.         /* scale AC coeffs */

  2865.         for (k = 1; k < 64; k++)

  2866.             if (block[k]) {

  2867.                 block[k] *= scale;

  2868.                 if (!v->pquantizer)

  2869.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2870.             }

  2871. 

  2872.         if (use_pred) i = 63;

  2873.     } else { // no AC coeffs

  2874.         int k;

  2875. 

  2876.         memset(ac_val2, 0, 16 * 2);

  2877.         if (dc_pred_dir) { // left

  2878.             if (use_pred) {

  2879.                 memcpy(ac_val2, ac_val, 8 * 2);

  2880.                 if (q2 && q1 != q2) {

  2881.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2882.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2883.                     if (q1 < 1)

  2884.                         return AVERROR_INVALIDDATA;

  2885.                     for (k = 1; k < 8; k++)

  2886.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2887.                 }

  2888.             }

  2889.         } else { // top

  2890.             if (use_pred) {

  2891.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2892.                 if (q2 && q1 != q2) {

  2893.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2894.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2895.                     if (q1 < 1)

  2896.                         return AVERROR_INVALIDDATA;

  2897.                     for (k = 1; k < 8; k++)

  2898.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2899.                 }

  2900.             }

  2901.         }

  2902. 

  2903.         /* apply AC prediction if needed */

  2904.         if (use_pred) {

  2905.             if (dc_pred_dir) { // left

  2906.                 for (k = 1; k < 8; k++) {

  2907.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  2908.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2909.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  2910.                 }

  2911.             } else { // top

  2912.                 for (k = 1; k < 8; k++) {

  2913.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  2914.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2915.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  2916.                 }

  2917.             }

  2918.             i = 63;

  2919.         }

  2920.     }

  2921.     s->block_last_index[n] = i;

  2922. 

  2923.     return 0;

  2924. }

  2925. 

  2926. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2927.  * @param v VC1Context

  2928.  * @param block block to decode

  2929.  * @param[in] n subblock index

  2930.  * @param coded are AC coeffs present or not

  2931.  * @param mquant block quantizer

  2932.  * @param codingset set of VLC to decode data

  2933.  */

  2934. static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,

  2935.                                   int coded, int mquant, int codingset)

  2936. {

  2937.     GetBitContext *gb = &v->s.gb;

  2938.     MpegEncContext *s = &v->s;

  2939.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2940.     int i;

  2941.     int16_t *dc_val;

  2942.     int16_t *ac_val, *ac_val2;

  2943.     int dcdiff;

  2944.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2945.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2946.     int use_pred = s->ac_pred;

  2947.     int scale;

  2948.     int q1, q2 = 0;

  2949. 

  2950.     s->dsp.clear_block(block);

  2951. 

  2952.     /* XXX: Guard against dumb values of mquant */

  2953.     mquant = (mquant < 1) ? 0 : ((mquant > 31) ? 31 : mquant);

  2954. 

  2955.     /* Set DC scale - y and c use the same */

  2956.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2957.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2958. 

  2959.     /* Get DC differential */

  2960.     if (n < 4) {

  2961.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2962.     } else {

  2963.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2964.     }

  2965.     if (dcdiff < 0) {

  2966.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2967.         return -1;

  2968.     }

  2969.     if (dcdiff) {

  2970.         if (dcdiff == 119 /* ESC index value */) {

  2971.             /* TODO: Optimize */

  2972.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  2973.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2974.             else                  dcdiff = get_bits(gb, 8);

  2975.         } else {

  2976.             if (mquant == 1)

  2977.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2978.             else if (mquant == 2)

  2979.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2980.         }

  2981.         if (get_bits1(gb))

  2982.             dcdiff = -dcdiff;

  2983.     }

  2984. 

  2985.     /* Prediction */

  2986.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2987.     *dc_val = dcdiff;

  2988. 

  2989.     /* Store the quantized DC coeff, used for prediction */

  2990. 

  2991.     if (n < 4) {

  2992.         block[0] = dcdiff * s->y_dc_scale;

  2993.     } else {

  2994.         block[0] = dcdiff * s->c_dc_scale;

  2995.     }

  2996. 

  2997.     //AC Decoding

  2998.     i = 1;

  2999. 

  3000.     /* check if AC is needed at all and adjust direction if needed */

  3001.     if (!a_avail) dc_pred_dir = 1;

  3002.     if (!c_avail) dc_pred_dir = 0;

  3003.     if (!a_avail && !c_avail) use_pred = 0;

  3004.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  3005.     ac_val2 = ac_val;

  3006. 

  3007.     scale = mquant * 2 + v->halfpq;

  3008. 

  3009.     if (dc_pred_dir) //left

  3010.         ac_val -= 16;

  3011.     else //top

  3012.         ac_val -= 16 * s->block_wrap[n];

  3013. 

  3014.     q1 = s->current_picture.f.qscale_table[mb_pos];

  3015.     if (dc_pred_dir && c_avail && mb_pos)

  3016.         q2 = s->current_picture.f.qscale_table[mb_pos - 1];

  3017.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  3018.         q2 = s->current_picture.f.qscale_table[mb_pos - s->mb_stride];

  3019.     if ( dc_pred_dir && n == 1)

  3020.         q2 = q1;

  3021.     if (!dc_pred_dir && n == 2)

  3022.         q2 = q1;

  3023.     if (n == 3) q2 = q1;

  3024. 

  3025.     if (coded) {

  3026.         int last = 0, skip, value;

  3027.         int k;

  3028. 

  3029.         while (!last) {

  3030.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  3031.             i += skip;

  3032.             if (i > 63)

  3033.                 break;

  3034.             if (v->fcm == PROGRESSIVE)

  3035.                 block[v->zz_8x8[0][i++]] = value;

  3036.             else {

  3037.                 if (use_pred && (v->fcm == ILACE_FRAME)) {

  3038.                     if (!dc_pred_dir) // top

  3039.                         block[v->zz_8x8[2][i++]] = value;

  3040.                     else // left

  3041.                         block[v->zz_8x8[3][i++]] = value;

  3042.                 } else {

  3043.                     block[v->zzi_8x8[i++]] = value;

  3044.                 }

  3045.             }

  3046.         }

  3047. 

  3048.         /* apply AC prediction if needed */

  3049.         if (use_pred) {

  3050.             /* scale predictors if needed*/

  3051.             if (q2 && q1 != q2) {

  3052.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3053.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3054. 

  3055.                 if (q1 < 1)

  3056.                     return AVERROR_INVALIDDATA;

  3057.                 if (dc_pred_dir) { // left

  3058.                     for (k = 1; k < 8; k++)

  3059.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3060.                 } else { //top

  3061.                     for (k = 1; k < 8; k++)

  3062.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3063.                 }

  3064.             } else {

  3065.                 if (dc_pred_dir) { // left

  3066.                     for (k = 1; k < 8; k++)

  3067.                         block[k << v->left_blk_sh] += ac_val[k];

  3068.                 } else { // top

  3069.                     for (k = 1; k < 8; k++)

  3070.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  3071.                 }

  3072.             }

  3073.         }

  3074.         /* save AC coeffs for further prediction */

  3075.         for (k = 1; k < 8; k++) {

  3076.             ac_val2[k    ] = block[k << v->left_blk_sh];

  3077.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  3078.         }

  3079. 

  3080.         /* scale AC coeffs */

  3081.         for (k = 1; k < 64; k++)

  3082.             if (block[k]) {

  3083.                 block[k] *= scale;

  3084.                 if (!v->pquantizer)

  3085.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3086.             }

  3087. 

  3088.         if (use_pred) i = 63;

  3089.     } else { // no AC coeffs

  3090.         int k;

  3091. 

  3092.         memset(ac_val2, 0, 16 * 2);

  3093.         if (dc_pred_dir) { // left

  3094.             if (use_pred) {

  3095.                 memcpy(ac_val2, ac_val, 8 * 2);

  3096.                 if (q2 && q1 != q2) {

  3097.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3098.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3099.                     if (q1 < 1)

  3100.                         return AVERROR_INVALIDDATA;

  3101.                     for (k = 1; k < 8; k++)

  3102.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3103.                 }

  3104.             }

  3105.         } else { // top

  3106.             if (use_pred) {

  3107.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3108.                 if (q2 && q1 != q2) {

  3109.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3110.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3111.                     if (q1 < 1)

  3112.                         return AVERROR_INVALIDDATA;

  3113.                     for (k = 1; k < 8; k++)

  3114.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3115.                 }

  3116.             }

  3117.         }

  3118. 

  3119.         /* apply AC prediction if needed */

  3120.         if (use_pred) {

  3121.             if (dc_pred_dir) { // left

  3122.                 for (k = 1; k < 8; k++) {

  3123.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  3124.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  3125.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  3126.                 }

  3127.             } else { // top

  3128.                 for (k = 1; k < 8; k++) {

  3129.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  3130.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  3131.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  3132.                 }

  3133.             }

  3134.             i = 63;

  3135.         }

  3136.     }

  3137.     s->block_last_index[n] = i;

  3138. 

  3139.     return 0;

  3140. }

  3141. 

  3142. /** Decode P block

  3143.  */

  3144. static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,

  3145.                               int mquant, int ttmb, int first_block,

  3146.                               uint8_t *dst, int linesize, int skip_block,

  3147.                               int *ttmb_out)

  3148. {

  3149.     MpegEncContext *s = &v->s;

  3150.     GetBitContext *gb = &s->gb;

  3151.     int i, j;

  3152.     int subblkpat = 0;

  3153.     int scale, off, idx, last, skip, value;

  3154.     int ttblk = ttmb & 7;

  3155.     int pat = 0;

  3156. 

  3157.     s->dsp.clear_block(block);

  3158. 

  3159.     if (ttmb == -1) {

  3160.         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)];

  3161.     }

  3162.     if (ttblk == TT_4X4) {

  3163.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  3164.     }

  3165.     if ((ttblk != TT_8X8 && ttblk != TT_4X4)

  3166.         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))

  3167.             || (!v->res_rtm_flag && !first_block))) {

  3168.         subblkpat = decode012(gb);

  3169.         if (subblkpat)

  3170.             subblkpat ^= 3; // swap decoded pattern bits

  3171.         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)

  3172.             ttblk = TT_8X4;

  3173.         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)

  3174.             ttblk = TT_4X8;

  3175.     }

  3176.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  3177. 

  3178.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  3179.     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  3180.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  3181.         ttblk     = TT_8X4;

  3182.     }

  3183.     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  3184.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  3185.         ttblk     = TT_4X8;

  3186.     }

  3187.     switch (ttblk) {

  3188.     case TT_8X8:

  3189.         pat  = 0xF;

  3190.         i    = 0;

  3191.         last = 0;

  3192.         while (!last) {

  3193.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3194.             i += skip;

  3195.             if (i > 63)

  3196.                 break;

  3197.             if (!v->fcm)

  3198.                 idx = v->zz_8x8[0][i++];

  3199.             else

  3200.                 idx = v->zzi_8x8[i++];

  3201.             block[idx] = value * scale;

  3202.             if (!v->pquantizer)

  3203.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3204.         }

  3205.         if (!skip_block) {

  3206.             if (i == 1)

  3207.                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);

  3208.             else {

  3209.                 v->vc1dsp.vc1_inv_trans_8x8(block);

  3210.                 s->dsp.add_pixels_clamped(block, dst, linesize);

  3211.             }

  3212.         }

  3213.         break;

  3214.     case TT_4X4:

  3215.         pat = ~subblkpat & 0xF;

  3216.         for (j = 0; j < 4; j++) {

  3217.             last = subblkpat & (1 << (3 - j));

  3218.             i    = 0;

  3219.             off  = (j & 1) * 4 + (j & 2) * 16;

  3220.             while (!last) {

  3221.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3222.                 i += skip;

  3223.                 if (i > 15)

  3224.                     break;

  3225.                 if (!v->fcm)

  3226.                     idx = ff_vc1_simple_progressive_4x4_zz[i++];

  3227.                 else

  3228.                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];

  3229.                 block[idx + off] = value * scale;

  3230.                 if (!v->pquantizer)

  3231.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3232.             }

  3233.             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {

  3234.                 if (i == 1)

  3235.                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);

  3236.                 else

  3237.                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);

  3238.             }

  3239.         }

  3240.         break;

  3241.     case TT_8X4:

  3242.         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;

  3243.         for (j = 0; j < 2; j++) {

  3244.             last = subblkpat & (1 << (1 - j));

  3245.             i    = 0;

  3246.             off  = j * 32;

  3247.             while (!last) {

  3248.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3249.                 i += skip;

  3250.                 if (i > 31)

  3251.                     break;

  3252.                 if (!v->fcm)

  3253.                     idx = v->zz_8x4[i++] + off;

  3254.                 else

  3255.                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;

  3256.                 block[idx] = value * scale;

  3257.                 if (!v->pquantizer)

  3258.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3259.             }

  3260.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3261.                 if (i == 1)

  3262.                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);

  3263.                 else

  3264.                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);

  3265.             }

  3266.         }

  3267.         break;

  3268.     case TT_4X8:

  3269.         pat = ~(subblkpat * 5) & 0xF;

  3270.         for (j = 0; j < 2; j++) {

  3271.             last = subblkpat & (1 << (1 - j));

  3272.             i    = 0;

  3273.             off  = j * 4;

  3274.             while (!last) {

  3275.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3276.                 i += skip;

  3277.                 if (i > 31)

  3278.                     break;

  3279.                 if (!v->fcm)

  3280.                     idx = v->zz_4x8[i++] + off;

  3281.                 else

  3282.                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;

  3283.                 block[idx] = value * scale;

  3284.                 if (!v->pquantizer)

  3285.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3286.             }

  3287.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3288.                 if (i == 1)

  3289.                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);

  3290.                 else

  3291.                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  3292.             }

  3293.         }

  3294.         break;

  3295.     }

  3296.     if (ttmb_out)

  3297.         *ttmb_out |= ttblk << (n * 4);

  3298.     return pat;

  3299. }

  3300. 

  3301. /** @} */ // Macroblock group

  3302. 

  3303. static const int size_table  [6] = { 0, 2, 3, 4,  5,  8 };

  3304. static const int offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3305. 

  3306. static av_always_inline void vc1_apply_p_v_loop_filter(VC1Context *v, int block_num)

  3307. {

  3308.     MpegEncContext *s  = &v->s;

  3309.     int mb_cbp         = v->cbp[s->mb_x - s->mb_stride],

  3310.         block_cbp      = mb_cbp      >> (block_num * 4), bottom_cbp,

  3311.         mb_is_intra    = v->is_intra[s->mb_x - s->mb_stride],

  3312.         block_is_intra = mb_is_intra >> (block_num * 4), bottom_is_intra;

  3313.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3314.     uint8_t *dst;

  3315. 

  3316.     if (block_num > 3) {

  3317.         dst      = s->dest[block_num - 3];

  3318.     } else {

  3319.         dst      = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 8) * linesize;

  3320.     }

  3321.     if (s->mb_y != s->end_mb_y || block_num < 2) {

  3322.         int16_t (*mv)[2];

  3323.         int mv_stride;

  3324. 

  3325.         if (block_num > 3) {

  3326.             bottom_cbp      = v->cbp[s->mb_x]      >> (block_num * 4);

  3327.             bottom_is_intra = v->is_intra[s->mb_x] >> (block_num * 4);

  3328.             mv              = &v->luma_mv[s->mb_x - s->mb_stride];

  3329.             mv_stride       = s->mb_stride;

  3330.         } else {

  3331.             bottom_cbp      = (block_num < 2) ? (mb_cbp               >> ((block_num + 2) * 4))

  3332.                                               : (v->cbp[s->mb_x]      >> ((block_num - 2) * 4));

  3333.             bottom_is_intra = (block_num < 2) ? (mb_is_intra          >> ((block_num + 2) * 4))

  3334.                                               : (v->is_intra[s->mb_x] >> ((block_num - 2) * 4));

  3335.             mv_stride       = s->b8_stride;

  3336.             mv              = &s->current_picture.f.motion_val[0][s->block_index[block_num] - 2 * mv_stride];

  3337.         }

  3338. 

  3339.         if (bottom_is_intra & 1 || block_is_intra & 1 ||

  3340.             mv[0][0] != mv[mv_stride][0] || mv[0][1] != mv[mv_stride][1]) {

  3341.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3342.         } else {

  3343.             idx = ((bottom_cbp >> 2) | block_cbp) & 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.     dst -= 4 * linesize;

  3356.     ttblk = (v->ttblk[s->mb_x - s->mb_stride] >> (block_num * 4)) & 0xF;

  3357.     if (ttblk == TT_4X4 || ttblk == TT_8X4) {

  3358.         idx = (block_cbp | (block_cbp >> 2)) & 3;

  3359.         if (idx == 3) {

  3360.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3361.         } else if (idx) {

  3362.             if (idx == 1)

  3363.                 v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3364.             else

  3365.                 v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3366.         }

  3367.     }

  3368. }

  3369. 

  3370. static av_always_inline void vc1_apply_p_h_loop_filter(VC1Context *v, int block_num)

  3371. {

  3372.     MpegEncContext *s  = &v->s;

  3373.     int mb_cbp         = v->cbp[s->mb_x - 1 - s->mb_stride],

  3374.         block_cbp      = mb_cbp      >> (block_num * 4), right_cbp,

  3375.         mb_is_intra    = v->is_intra[s->mb_x - 1 - s->mb_stride],

  3376.         block_is_intra = mb_is_intra >> (block_num * 4), right_is_intra;

  3377.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3378.     uint8_t *dst;

  3379. 

  3380.     if (block_num > 3) {

  3381.         dst = s->dest[block_num - 3] - 8 * linesize;

  3382.     } else {

  3383.         dst = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 16) * linesize - 8;

  3384.     }

  3385. 

  3386.     if (s->mb_x != s->mb_width || !(block_num & 5)) {

  3387.         int16_t (*mv)[2];

  3388. 

  3389.         if (block_num > 3) {

  3390.             right_cbp      = v->cbp[s->mb_x - s->mb_stride] >> (block_num * 4);

  3391.             right_is_intra = v->is_intra[s->mb_x - s->mb_stride] >> (block_num * 4);

  3392.             mv             = &v->luma_mv[s->mb_x - s->mb_stride - 1];

  3393.         } else {

  3394.             right_cbp      = (block_num & 1) ? (v->cbp[s->mb_x - s->mb_stride]      >> ((block_num - 1) * 4))

  3395.                                              : (mb_cbp                              >> ((block_num + 1) * 4));

  3396.             right_is_intra = (block_num & 1) ? (v->is_intra[s->mb_x - s->mb_stride] >> ((block_num - 1) * 4))

  3397.                                              : (mb_is_intra                         >> ((block_num + 1) * 4));

  3398.             mv             = &s->current_picture.f.motion_val[0][s->block_index[block_num] - s->b8_stride * 2 - 2];

  3399.         }

  3400.         if (block_is_intra & 1 || right_is_intra & 1 || mv[0][0] != mv[1][0] || mv[0][1] != mv[1][1]) {

  3401.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3402.         } else {

  3403.             idx = ((right_cbp >> 1) | block_cbp) & 5; // FIXME check

  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 + 4 * linesize, linesize, v->pq);

  3409.                 else

  3410.                     v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3411.             }

  3412.         }

  3413.     }

  3414. 

  3415.     dst -= 4;

  3416.     ttblk = (v->ttblk[s->mb_x - s->mb_stride - 1] >> (block_num * 4)) & 0xf;

  3417.     if (ttblk == TT_4X4 || ttblk == TT_4X8) {

  3418.         idx = (block_cbp | (block_cbp >> 1)) & 5;

  3419.         if (idx == 5) {

  3420.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3421.         } else if (idx) {

  3422.             if (idx == 1)

  3423.                 v->vc1dsp.vc1_h_loop_filter4(dst + linesize * 4, linesize, v->pq);

  3424.             else

  3425.                 v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3426.         }

  3427.     }

  3428. }

  3429. 

  3430. static void vc1_apply_p_loop_filter(VC1Context *v)

  3431. {

  3432.     MpegEncContext *s = &v->s;

  3433.     int i;

  3434. 

  3435.     for (i = 0; i < 6; i++) {

  3436.         vc1_apply_p_v_loop_filter(v, i);

  3437.     }

  3438. 

  3439.     /* V always precedes H, therefore we run H one MB before V;

  3440.      * at the end of a row, we catch up to complete the row */

  3441.     if (s->mb_x) {

  3442.         for (i = 0; i < 6; i++) {

  3443.             vc1_apply_p_h_loop_filter(v, i);

  3444.         }

  3445.         if (s->mb_x == s->mb_width - 1) {

  3446.             s->mb_x++;

  3447.             ff_update_block_index(s);

  3448.             for (i = 0; i < 6; i++) {

  3449.                 vc1_apply_p_h_loop_filter(v, i);

  3450.             }

  3451.         }

  3452.     }

  3453. }

  3454. 

  3455. /** Decode one P-frame MB

  3456.  */

  3457. static int vc1_decode_p_mb(VC1Context *v)

  3458. {

  3459.     MpegEncContext *s = &v->s;

  3460.     GetBitContext *gb = &s->gb;

  3461.     int i, j;

  3462.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3463.     int cbp; /* cbp decoding stuff */

  3464.     int mqdiff, mquant; /* MB quantization */

  3465.     int ttmb = v->ttfrm; /* MB Transform type */

  3466. 

  3467.     int mb_has_coeffs = 1; /* last_flag */

  3468.     int dmv_x, dmv_y; /* Differential MV components */

  3469.     int index, index1; /* LUT indexes */

  3470.     int val, sign; /* temp values */

  3471.     int first_block = 1;

  3472.     int dst_idx, off;

  3473.     int skipped, fourmv;

  3474.     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;

  3475. 

  3476.     mquant = v->pq; /* lossy initialization */

  3477. 

  3478.     if (v->mv_type_is_raw)

  3479.         fourmv = get_bits1(gb);

  3480.     else

  3481.         fourmv = v->mv_type_mb_plane[mb_pos];

  3482.     if (v->skip_is_raw)

  3483.         skipped = get_bits1(gb);

  3484.     else

  3485.         skipped = v->s.mbskip_table[mb_pos];

  3486. 

  3487.     if (!fourmv) { /* 1MV mode */

  3488.         if (!skipped) {

  3489.             GET_MVDATA(dmv_x, dmv_y);

  3490. 

  3491.             if (s->mb_intra) {

  3492.                 s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;

  3493.                 s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;

  3494.             }

  3495.             s->current_picture.f.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3496.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3497. 

  3498.             /* FIXME Set DC val for inter block ? */

  3499.             if (s->mb_intra && !mb_has_coeffs) {

  3500.                 GET_MQUANT();

  3501.                 s->ac_pred = get_bits1(gb);

  3502.                 cbp        = 0;

  3503.             } else if (mb_has_coeffs) {

  3504.                 if (s->mb_intra)

  3505.                     s->ac_pred = get_bits1(gb);

  3506.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3507.                 GET_MQUANT();

  3508.             } else {

  3509.                 mquant = v->pq;

  3510.                 cbp    = 0;

  3511.             }

  3512.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  3513. 

  3514.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3515.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3516.                                 VC1_TTMB_VLC_BITS, 2);

  3517.             if (!s->mb_intra) vc1_mc_1mv(v, 0);

  3518.             dst_idx = 0;

  3519.             for (i = 0; i < 6; i++) {

  3520.                 s->dc_val[0][s->block_index[i]] = 0;

  3521.                 dst_idx += i >> 2;

  3522.                 val = ((cbp >> (5 - i)) & 1);

  3523.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3524.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3525.                 if (s->mb_intra) {

  3526.                     /* check if prediction blocks A and C are available */

  3527.                     v->a_avail = v->c_avail = 0;

  3528.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3529.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3530.                     if (i == 1 || i == 3 || s->mb_x)

  3531.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3532. 

  3533.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3534.                                            (i & 4) ? v->codingset2 : v->codingset);

  3535.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3536.                         continue;

  3537.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3538.                     if (v->rangeredfrm)

  3539.                         for (j = 0; j < 64; j++)

  3540.                             s->block[i][j] <<= 1;

  3541.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3542.                     if (v->pq >= 9 && v->overlap) {

  3543.                         if (v->c_avail)

  3544.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3545.                         if (v->a_avail)

  3546.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3547.                     }

  3548.                     block_cbp   |= 0xF << (i << 2);

  3549.                     block_intra |= 1 << i;

  3550.                 } else if (val) {

  3551.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block,

  3552.                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,

  3553.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3554.                     block_cbp |= pat << (i << 2);

  3555.                     if (!v->ttmbf && ttmb < 8)

  3556.                         ttmb = -1;

  3557.                     first_block = 0;

  3558.                 }

  3559.             }

  3560.         } else { // skipped

  3561.             s->mb_intra = 0;

  3562.             for (i = 0; i < 6; i++) {

  3563.                 v->mb_type[0][s->block_index[i]] = 0;

  3564.                 s->dc_val[0][s->block_index[i]]  = 0;

  3565.             }

  3566.             s->current_picture.f.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3567.             s->current_picture.f.qscale_table[mb_pos] = 0;

  3568.             vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3569.             vc1_mc_1mv(v, 0);

  3570.         }

  3571.     } else { // 4MV mode

  3572.         if (!skipped /* unskipped MB */) {

  3573.             int intra_count = 0, coded_inter = 0;

  3574.             int is_intra[6], is_coded[6];

  3575.             /* Get CBPCY */

  3576.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3577.             for (i = 0; i < 6; i++) {

  3578.                 val = ((cbp >> (5 - i)) & 1);

  3579.                 s->dc_val[0][s->block_index[i]] = 0;

  3580.                 s->mb_intra                     = 0;

  3581.                 if (i < 4) {

  3582.                     dmv_x = dmv_y = 0;

  3583.                     s->mb_intra   = 0;

  3584.                     mb_has_coeffs = 0;

  3585.                     if (val) {

  3586.                         GET_MVDATA(dmv_x, dmv_y);

  3587.                     }

  3588.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3589.                     if (!s->mb_intra)

  3590.                         vc1_mc_4mv_luma(v, i, 0);

  3591.                     intra_count += s->mb_intra;

  3592.                     is_intra[i]  = s->mb_intra;

  3593.                     is_coded[i]  = mb_has_coeffs;

  3594.                 }

  3595.                 if (i & 4) {

  3596.                     is_intra[i] = (intra_count >= 3);

  3597.                     is_coded[i] = val;

  3598.                 }

  3599.                 if (i == 4)

  3600.                     vc1_mc_4mv_chroma(v, 0);

  3601.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3602.                 if (!coded_inter)

  3603.                     coded_inter = !is_intra[i] & is_coded[i];

  3604.             }

  3605.             // if there are no coded blocks then don't do anything more

  3606.             dst_idx = 0;

  3607.             if (!intra_count && !coded_inter)

  3608.                 goto end;

  3609.             GET_MQUANT();

  3610.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  3611.             /* test if block is intra and has pred */

  3612.             {

  3613.                 int intrapred = 0;

  3614.                 for (i = 0; i < 6; i++)

  3615.                     if (is_intra[i]) {

  3616.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3617.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3618.                             intrapred = 1;

  3619.                             break;

  3620.                         }

  3621.                     }

  3622.                 if (intrapred)

  3623.                     s->ac_pred = get_bits1(gb);

  3624.                 else

  3625.                     s->ac_pred = 0;

  3626.             }

  3627.             if (!v->ttmbf && coded_inter)

  3628.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3629.             for (i = 0; i < 6; i++) {

  3630.                 dst_idx    += i >> 2;

  3631.                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3632.                 s->mb_intra = is_intra[i];

  3633.                 if (is_intra[i]) {

  3634.                     /* check if prediction blocks A and C are available */

  3635.                     v->a_avail = v->c_avail = 0;

  3636.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3637.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3638.                     if (i == 1 || i == 3 || s->mb_x)

  3639.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3640. 

  3641.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant,

  3642.                                            (i & 4) ? v->codingset2 : v->codingset);

  3643.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3644.                         continue;

  3645.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3646.                     if (v->rangeredfrm)

  3647.                         for (j = 0; j < 64; j++)

  3648.                             s->block[i][j] <<= 1;

  3649.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off,

  3650.                                                      (i & 4) ? s->uvlinesize : s->linesize);

  3651.                     if (v->pq >= 9 && v->overlap) {

  3652.                         if (v->c_avail)

  3653.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3654.                         if (v->a_avail)

  3655.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3656.                     }

  3657.                     block_cbp   |= 0xF << (i << 2);

  3658.                     block_intra |= 1 << i;

  3659.                 } else if (is_coded[i]) {

  3660.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3661.                                              first_block, s->dest[dst_idx] + off,

  3662.                                              (i & 4) ? s->uvlinesize : s->linesize,

  3663.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  3664.                                              &block_tt);

  3665.                     block_cbp |= pat << (i << 2);

  3666.                     if (!v->ttmbf && ttmb < 8)

  3667.                         ttmb = -1;

  3668.                     first_block = 0;

  3669.                 }

  3670.             }

  3671.         } else { // skipped MB

  3672.             s->mb_intra                               = 0;

  3673.             s->current_picture.f.qscale_table[mb_pos] = 0;

  3674.             for (i = 0; i < 6; i++) {

  3675.                 v->mb_type[0][s->block_index[i]] = 0;

  3676.                 s->dc_val[0][s->block_index[i]]  = 0;

  3677.             }

  3678.             for (i = 0; i < 4; i++) {

  3679.                 vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3680.                 vc1_mc_4mv_luma(v, i, 0);

  3681.             }

  3682.             vc1_mc_4mv_chroma(v, 0);

  3683.             s->current_picture.f.qscale_table[mb_pos] = 0;

  3684.         }

  3685.     }

  3686. end:

  3687.     v->cbp[s->mb_x]      = block_cbp;

  3688.     v->ttblk[s->mb_x]    = block_tt;

  3689.     v->is_intra[s->mb_x] = block_intra;

  3690. 

  3691.     return 0;

  3692. }

  3693. 

  3694. /* Decode one macroblock in an interlaced frame p picture */

  3695. 

  3696. static int vc1_decode_p_mb_intfr(VC1Context *v)

  3697. {

  3698.     MpegEncContext *s = &v->s;

  3699.     GetBitContext *gb = &s->gb;

  3700.     int i;

  3701.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3702.     int cbp = 0; /* cbp decoding stuff */

  3703.     int mqdiff, mquant; /* MB quantization */

  3704.     int ttmb = v->ttfrm; /* MB Transform type */

  3705. 

  3706.     int mb_has_coeffs = 1; /* last_flag */

  3707.     int dmv_x, dmv_y; /* Differential MV components */

  3708.     int val; /* temp value */

  3709.     int first_block = 1;

  3710.     int dst_idx, off;

  3711.     int skipped, fourmv = 0, twomv = 0;

  3712.     int block_cbp = 0, pat, block_tt = 0;

  3713.     int idx_mbmode = 0, mvbp;

  3714.     int stride_y, fieldtx;

  3715. 

  3716.     mquant = v->pq; /* Lossy initialization */

  3717. 

  3718.     if (v->skip_is_raw)

  3719.         skipped = get_bits1(gb);

  3720.     else

  3721.         skipped = v->s.mbskip_table[mb_pos];

  3722.     if (!skipped) {

  3723.         if (v->fourmvswitch)

  3724.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done

  3725.         else

  3726.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line

  3727.         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {

  3728.         /* store the motion vector type in a flag (useful later) */

  3729.         case MV_PMODE_INTFR_4MV:

  3730.             fourmv = 1;

  3731.             v->blk_mv_type[s->block_index[0]] = 0;

  3732.             v->blk_mv_type[s->block_index[1]] = 0;

  3733.             v->blk_mv_type[s->block_index[2]] = 0;

  3734.             v->blk_mv_type[s->block_index[3]] = 0;

  3735.             break;

  3736.         case MV_PMODE_INTFR_4MV_FIELD:

  3737.             fourmv = 1;

  3738.             v->blk_mv_type[s->block_index[0]] = 1;

  3739.             v->blk_mv_type[s->block_index[1]] = 1;

  3740.             v->blk_mv_type[s->block_index[2]] = 1;

  3741.             v->blk_mv_type[s->block_index[3]] = 1;

  3742.             break;

  3743.         case MV_PMODE_INTFR_2MV_FIELD:

  3744.             twomv = 1;

  3745.             v->blk_mv_type[s->block_index[0]] = 1;

  3746.             v->blk_mv_type[s->block_index[1]] = 1;

  3747.             v->blk_mv_type[s->block_index[2]] = 1;

  3748.             v->blk_mv_type[s->block_index[3]] = 1;

  3749.             break;

  3750.         case MV_PMODE_INTFR_1MV:

  3751.             v->blk_mv_type[s->block_index[0]] = 0;

  3752.             v->blk_mv_type[s->block_index[1]] = 0;

  3753.             v->blk_mv_type[s->block_index[2]] = 0;

  3754.             v->blk_mv_type[s->block_index[3]] = 0;

  3755.             break;

  3756.         }

  3757.         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  3758.             s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;

  3759.             s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;

  3760.             s->current_picture.f.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  3761.             s->mb_intra = v->is_intra[s->mb_x] = 1;

  3762.             for (i = 0; i < 6; i++)

  3763.                 v->mb_type[0][s->block_index[i]] = 1;

  3764.             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  3765.             mb_has_coeffs = get_bits1(gb);

  3766.             if (mb_has_coeffs)

  3767.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3768.             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  3769.             GET_MQUANT();

  3770.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  3771.             /* Set DC scale - y and c use the same (not sure if necessary here) */

  3772.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3773.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3774.             dst_idx = 0;

  3775.             for (i = 0; i < 6; i++) {

  3776.                 s->dc_val[0][s->block_index[i]] = 0;

  3777.                 dst_idx += i >> 2;

  3778.                 val = ((cbp >> (5 - i)) & 1);

  3779.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3780.                 v->a_avail = v->c_avail = 0;

  3781.                 if (i == 2 || i == 3 || !s->first_slice_line)

  3782.                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3783.                 if (i == 1 || i == 3 || s->mb_x)

  3784.                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3785. 

  3786.                 vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3787.                                        (i & 4) ? v->codingset2 : v->codingset);

  3788.                 if ((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3789.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3790.                 if (i < 4) {

  3791.                     stride_y = s->linesize << fieldtx;

  3792.                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  3793.                 } else {

  3794.                     stride_y = s->uvlinesize;

  3795.                     off = 0;

  3796.                 }

  3797.                 s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, stride_y);

  3798.                 //TODO: loop filter

  3799.             }

  3800. 

  3801.         } else { // inter MB

  3802.             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];

  3803.             if (mb_has_coeffs)

  3804.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3805.             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  3806.                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  3807.             } else {

  3808.                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)

  3809.                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {

  3810.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  3811.                 }

  3812.             }

  3813.             s->mb_intra = v->is_intra[s->mb_x] = 0;

  3814.             for (i = 0; i < 6; i++)

  3815.                 v->mb_type[0][s->block_index[i]] = 0;

  3816.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];

  3817.             /* for all motion vector read MVDATA and motion compensate each block */

  3818.             dst_idx = 0;

  3819.             if (fourmv) {

  3820.                 mvbp = v->fourmvbp;

  3821.                 for (i = 0; i < 6; i++) {

  3822.                     if (i < 4) {

  3823.                         dmv_x = dmv_y = 0;

  3824.                         val   = ((mvbp >> (3 - i)) & 1);

  3825.                         if (val) {

  3826.                             get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3827.                         }

  3828.                         vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3829.                         vc1_mc_4mv_luma(v, i, 0);

  3830.                     } else if (i == 4) {

  3831.                         vc1_mc_4mv_chroma4(v);

  3832.                     }

  3833.                 }

  3834.             } else if (twomv) {

  3835.                 mvbp  = v->twomvbp;

  3836.                 dmv_x = dmv_y = 0;

  3837.                 if (mvbp & 2) {

  3838.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3839.                 }

  3840.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0]);

  3841.                 vc1_mc_4mv_luma(v, 0, 0);

  3842.                 vc1_mc_4mv_luma(v, 1, 0);

  3843.                 dmv_x = dmv_y = 0;

  3844.                 if (mvbp & 1) {

  3845.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3846.                 }

  3847.                 vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0]);

  3848.                 vc1_mc_4mv_luma(v, 2, 0);

  3849.                 vc1_mc_4mv_luma(v, 3, 0);

  3850.                 vc1_mc_4mv_chroma4(v);

  3851.             } else {

  3852.                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];

  3853.                 dmv_x = dmv_y = 0;

  3854.                 if (mvbp) {

  3855.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3856.                 }

  3857.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3858.                 vc1_mc_1mv(v, 0);

  3859.             }

  3860.             if (cbp)

  3861.                 GET_MQUANT();  // p. 227

  3862.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  3863.             if (!v->ttmbf && cbp)

  3864.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3865.             for (i = 0; i < 6; i++) {

  3866.                 s->dc_val[0][s->block_index[i]] = 0;

  3867.                 dst_idx += i >> 2;

  3868.                 val = ((cbp >> (5 - i)) & 1);

  3869.                 if (!fieldtx)

  3870.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3871.                 else

  3872.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  3873.                 if (val) {

  3874.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3875.                                              first_block, s->dest[dst_idx] + off,

  3876.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  3877.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3878.                     block_cbp |= pat << (i << 2);

  3879.                     if (!v->ttmbf && ttmb < 8)

  3880.                         ttmb = -1;

  3881.                     first_block = 0;

  3882.                 }

  3883.             }

  3884.         }

  3885.     } else { // skipped

  3886.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  3887.         for (i = 0; i < 6; i++) {

  3888.             v->mb_type[0][s->block_index[i]] = 0;

  3889.             s->dc_val[0][s->block_index[i]] = 0;

  3890.         }

  3891.         s->current_picture.f.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3892.         s->current_picture.f.qscale_table[mb_pos] = 0;

  3893.         v->blk_mv_type[s->block_index[0]] = 0;

  3894.         v->blk_mv_type[s->block_index[1]] = 0;

  3895.         v->blk_mv_type[s->block_index[2]] = 0;

  3896.         v->blk_mv_type[s->block_index[3]] = 0;

  3897.         vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3898.         vc1_mc_1mv(v, 0);

  3899.     }

  3900.     if (s->mb_x == s->mb_width - 1)

  3901.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);

  3902.     return 0;

  3903. }

  3904. 

  3905. static int vc1_decode_p_mb_intfi(VC1Context *v)

  3906. {

  3907.     MpegEncContext *s = &v->s;

  3908.     GetBitContext *gb = &s->gb;

  3909.     int i;

  3910.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3911.     int cbp = 0; /* cbp decoding stuff */

  3912.     int mqdiff, mquant; /* MB quantization */

  3913.     int ttmb = v->ttfrm; /* MB Transform type */

  3914. 

  3915.     int mb_has_coeffs = 1; /* last_flag */

  3916.     int dmv_x, dmv_y; /* Differential MV components */

  3917.     int val; /* temp values */

  3918.     int first_block = 1;

  3919.     int dst_idx, off;

  3920.     int pred_flag = 0;

  3921.     int block_cbp = 0, pat, block_tt = 0;

  3922.     int idx_mbmode = 0;

  3923. 

  3924.     mquant = v->pq; /* Lossy initialization */

  3925. 

  3926.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  3927.     if (idx_mbmode <= 1) { // intra MB

  3928.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  3929.         s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  3930.         s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  3931.         s->current_picture.f.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;

  3932.         GET_MQUANT();

  3933.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  3934.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  3935.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  3936.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  3937.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  3938.         mb_has_coeffs = idx_mbmode & 1;

  3939.         if (mb_has_coeffs)

  3940.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  3941.         dst_idx = 0;

  3942.         for (i = 0; i < 6; i++) {

  3943.             s->dc_val[0][s->block_index[i]]  = 0;

  3944.             v->mb_type[0][s->block_index[i]] = 1;

  3945.             dst_idx += i >> 2;

  3946.             val = ((cbp >> (5 - i)) & 1);

  3947.             v->a_avail = v->c_avail = 0;

  3948.             if (i == 2 || i == 3 || !s->first_slice_line)

  3949.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3950.             if (i == 1 || i == 3 || s->mb_x)

  3951.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3952. 

  3953.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3954.                                    (i & 4) ? v->codingset2 : v->codingset);

  3955.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3956.                 continue;

  3957.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3958.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3959.             off += v->second_field ? ((i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0]) : 0;

  3960.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  3961.             // TODO: loop filter

  3962.         }

  3963.     } else {

  3964.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  3965.         s->current_picture.f.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  3966.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  3967.         if (idx_mbmode <= 5) { // 1-MV

  3968.             dmv_x = dmv_y = pred_flag = 0;

  3969.             if (idx_mbmode & 1) {

  3970.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  3971.             }

  3972.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  3973.             vc1_mc_1mv(v, 0);

  3974.             mb_has_coeffs = !(idx_mbmode & 2);

  3975.         } else { // 4-MV

  3976.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  3977.             for (i = 0; i < 6; i++) {

  3978.                 if (i < 4) {

  3979.                     dmv_x = dmv_y = pred_flag = 0;

  3980.                     val   = ((v->fourmvbp >> (3 - i)) & 1);

  3981.                     if (val) {

  3982.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  3983.                     }

  3984.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  3985.                     vc1_mc_4mv_luma(v, i, 0);

  3986.                 } else if (i == 4)

  3987.                     vc1_mc_4mv_chroma(v, 0);

  3988.             }

  3989.             mb_has_coeffs = idx_mbmode & 1;

  3990.         }

  3991.         if (mb_has_coeffs)

  3992.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3993.         if (cbp) {

  3994.             GET_MQUANT();

  3995.         }

  3996.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  3997.         if (!v->ttmbf && cbp) {

  3998.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3999.         }

  4000.         dst_idx = 0;

  4001.         for (i = 0; i < 6; i++) {

  4002.             s->dc_val[0][s->block_index[i]] = 0;

  4003.             dst_idx += i >> 2;

  4004.             val = ((cbp >> (5 - i)) & 1);

  4005.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  4006.             if (v->second_field)

  4007.                 off += (i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0];

  4008.             if (val) {

  4009.                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4010.                                          first_block, s->dest[dst_idx] + off,

  4011.                                          (i & 4) ? s->uvlinesize : s->linesize,

  4012.                                          (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  4013.                                          &block_tt);

  4014.                 block_cbp |= pat << (i << 2);

  4015.                 if (!v->ttmbf && ttmb < 8) ttmb = -1;

  4016.                 first_block = 0;

  4017.             }

  4018.         }

  4019.     }

  4020.     if (s->mb_x == s->mb_width - 1)

  4021.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4022.     return 0;

  4023. }

  4024. 

  4025. /** Decode one B-frame MB (in Main profile)

  4026.  */

  4027. static void vc1_decode_b_mb(VC1Context *v)

  4028. {

  4029.     MpegEncContext *s = &v->s;

  4030.     GetBitContext *gb = &s->gb;

  4031.     int i, j;

  4032.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4033.     int cbp = 0; /* cbp decoding stuff */

  4034.     int mqdiff, mquant; /* MB quantization */

  4035.     int ttmb = v->ttfrm; /* MB Transform type */

  4036.     int mb_has_coeffs = 0; /* last_flag */

  4037.     int index, index1; /* LUT indexes */

  4038.     int val, sign; /* temp values */

  4039.     int first_block = 1;

  4040.     int dst_idx, off;

  4041.     int skipped, direct;

  4042.     int dmv_x[2], dmv_y[2];

  4043.     int bmvtype = BMV_TYPE_BACKWARD;

  4044. 

  4045.     mquant      = v->pq; /* lossy initialization */

  4046.     s->mb_intra = 0;

  4047. 

  4048.     if (v->dmb_is_raw)

  4049.         direct = get_bits1(gb);

  4050.     else

  4051.         direct = v->direct_mb_plane[mb_pos];

  4052.     if (v->skip_is_raw)

  4053.         skipped = get_bits1(gb);

  4054.     else

  4055.         skipped = v->s.mbskip_table[mb_pos];

  4056. 

  4057.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4058.     for (i = 0; i < 6; i++) {

  4059.         v->mb_type[0][s->block_index[i]] = 0;

  4060.         s->dc_val[0][s->block_index[i]]  = 0;

  4061.     }

  4062.     s->current_picture.f.qscale_table[mb_pos] = 0;

  4063. 

  4064.     if (!direct) {

  4065.         if (!skipped) {

  4066.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  4067.             dmv_x[1] = dmv_x[0];

  4068.             dmv_y[1] = dmv_y[0];

  4069.         }

  4070.         if (skipped || !s->mb_intra) {

  4071.             bmvtype = decode012(gb);

  4072.             switch (bmvtype) {

  4073.             case 0:

  4074.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  4075.                 break;

  4076.             case 1:

  4077.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  4078.                 break;

  4079.             case 2:

  4080.                 bmvtype  = BMV_TYPE_INTERPOLATED;

  4081.                 dmv_x[0] = dmv_y[0] = 0;

  4082.             }

  4083.         }

  4084.     }

  4085.     for (i = 0; i < 6; i++)

  4086.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4087. 

  4088.     if (skipped) {

  4089.         if (direct)

  4090.             bmvtype = BMV_TYPE_INTERPOLATED;

  4091.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4092.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4093.         return;

  4094.     }

  4095.     if (direct) {

  4096.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4097.         GET_MQUANT();

  4098.         s->mb_intra = 0;

  4099.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  4100.         if (!v->ttmbf)

  4101.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4102.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  4103.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4104.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4105.     } else {

  4106.         if (!mb_has_coeffs && !s->mb_intra) {

  4107.             /* no coded blocks - effectively skipped */

  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.         if (s->mb_intra && !mb_has_coeffs) {

  4113.             GET_MQUANT();

  4114.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  4115.             s->ac_pred = get_bits1(gb);

  4116.             cbp = 0;

  4117.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4118.         } else {

  4119.             if (bmvtype == BMV_TYPE_INTERPOLATED) {

  4120.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  4121.                 if (!mb_has_coeffs) {

  4122.                     /* interpolated skipped block */

  4123.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4124.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4125.                     return;

  4126.                 }

  4127.             }

  4128.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4129.             if (!s->mb_intra) {

  4130.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4131.             }

  4132.             if (s->mb_intra)

  4133.                 s->ac_pred = get_bits1(gb);

  4134.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4135.             GET_MQUANT();

  4136.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  4137.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  4138.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4139.         }

  4140.     }

  4141.     dst_idx = 0;

  4142.     for (i = 0; i < 6; i++) {

  4143.         s->dc_val[0][s->block_index[i]] = 0;

  4144.         dst_idx += i >> 2;

  4145.         val = ((cbp >> (5 - i)) & 1);

  4146.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4147.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4148.         if (s->mb_intra) {

  4149.             /* check if prediction blocks A and C are available */

  4150.             v->a_avail = v->c_avail = 0;

  4151.             if (i == 2 || i == 3 || !s->first_slice_line)

  4152.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4153.             if (i == 1 || i == 3 || s->mb_x)

  4154.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4155. 

  4156.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4157.                                    (i & 4) ? v->codingset2 : v->codingset);

  4158.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4159.                 continue;

  4160.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4161.             if (v->rangeredfrm)

  4162.                 for (j = 0; j < 64; j++)

  4163.                     s->block[i][j] <<= 1;

  4164.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  4165.         } else if (val) {

  4166.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4167.                                first_block, s->dest[dst_idx] + off,

  4168.                                (i & 4) ? s->uvlinesize : s->linesize,

  4169.                                (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4170.             if (!v->ttmbf && ttmb < 8)

  4171.                 ttmb = -1;

  4172.             first_block = 0;

  4173.         }

  4174.     }

  4175. }

  4176. 

  4177. /** Decode one B-frame MB (in interlaced field B picture)

  4178.  */

  4179. static void vc1_decode_b_mb_intfi(VC1Context *v)

  4180. {

  4181.     MpegEncContext *s = &v->s;

  4182.     GetBitContext *gb = &s->gb;

  4183.     int i, j;

  4184.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4185.     int cbp = 0; /* cbp decoding stuff */

  4186.     int mqdiff, mquant; /* MB quantization */

  4187.     int ttmb = v->ttfrm; /* MB Transform type */

  4188.     int mb_has_coeffs = 0; /* last_flag */

  4189.     int val; /* temp value */

  4190.     int first_block = 1;

  4191.     int dst_idx, off;

  4192.     int fwd;

  4193.     int dmv_x[2], dmv_y[2], pred_flag[2];

  4194.     int bmvtype = BMV_TYPE_BACKWARD;

  4195.     int idx_mbmode, interpmvp;

  4196. 

  4197.     mquant      = v->pq; /* Lossy initialization */

  4198.     s->mb_intra = 0;

  4199. 

  4200.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  4201.     if (idx_mbmode <= 1) { // intra MB

  4202.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  4203.         s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;

  4204.         s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;

  4205.         s->current_picture.f.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;

  4206.         GET_MQUANT();

  4207.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  4208.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  4209.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  4210.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  4211.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  4212.         mb_has_coeffs = idx_mbmode & 1;

  4213.         if (mb_has_coeffs)

  4214.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  4215.         dst_idx = 0;

  4216.         for (i = 0; i < 6; i++) {

  4217.             s->dc_val[0][s->block_index[i]] = 0;

  4218.             dst_idx += i >> 2;

  4219.             val = ((cbp >> (5 - i)) & 1);

  4220.             v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4221.             v->a_avail                       = v->c_avail = 0;

  4222.             if (i == 2 || i == 3 || !s->first_slice_line)

  4223.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4224.             if (i == 1 || i == 3 || s->mb_x)

  4225.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4226. 

  4227.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4228.                                    (i & 4) ? v->codingset2 : v->codingset);

  4229.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4230.                 continue;

  4231.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4232.             if (v->rangeredfrm)

  4233.                 for (j = 0; j < 64; j++)

  4234.                     s->block[i][j] <<= 1;

  4235.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4236.             off += v->second_field ? ((i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0]) : 0;

  4237.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  4238.             // TODO: yet to perform loop filter

  4239.         }

  4240.     } else {

  4241.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4242.         s->current_picture.f.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  4243.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  4244.         if (v->fmb_is_raw)

  4245.             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);

  4246.         else

  4247.             fwd = v->forward_mb_plane[mb_pos];

  4248.         if (idx_mbmode <= 5) { // 1-MV

  4249.             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4250.             pred_flag[0] = pred_flag[1] = 0;

  4251.             if (fwd)

  4252.                 bmvtype = BMV_TYPE_FORWARD;

  4253.             else {

  4254.                 bmvtype = decode012(gb);

  4255.                 switch (bmvtype) {

  4256.                 case 0:

  4257.                     bmvtype = BMV_TYPE_BACKWARD;

  4258.                     break;

  4259.                 case 1:

  4260.                     bmvtype = BMV_TYPE_DIRECT;

  4261.                     break;

  4262.                 case 2:

  4263.                     bmvtype   = BMV_TYPE_INTERPOLATED;

  4264.                     interpmvp = get_bits1(gb);

  4265.                 }

  4266.             }

  4267.             v->bmvtype = bmvtype;

  4268.             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {

  4269.                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4270.             }

  4271.             if (bmvtype == BMV_TYPE_INTERPOLATED && interpmvp) {

  4272.                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);

  4273.             }

  4274.             if (bmvtype == BMV_TYPE_DIRECT) {

  4275.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4276.                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;

  4277.             }

  4278.             vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);

  4279.             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);

  4280.             mb_has_coeffs = !(idx_mbmode & 2);

  4281.         } else { // 4-MV

  4282.             if (fwd)

  4283.                 bmvtype = BMV_TYPE_FORWARD;

  4284.             v->bmvtype  = bmvtype;

  4285.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4286.             for (i = 0; i < 6; i++) {

  4287.                 if (i < 4) {

  4288.                     dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4289.                     dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;

  4290.                     val = ((v->fourmvbp >> (3 - i)) & 1);

  4291.                     if (val) {

  4292.                         get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],

  4293.                                                  &dmv_y[bmvtype == BMV_TYPE_BACKWARD],

  4294.                                              &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4295.                     }

  4296.                     vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);

  4297.                     vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD);

  4298.                 } else if (i == 4)

  4299.                     vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);

  4300.             }

  4301.             mb_has_coeffs = idx_mbmode & 1;

  4302.         }

  4303.         if (mb_has_coeffs)

  4304.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4305.         if (cbp) {

  4306.             GET_MQUANT();

  4307.         }

  4308.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  4309.         if (!v->ttmbf && cbp) {

  4310.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4311.         }

  4312.         dst_idx = 0;

  4313.         for (i = 0; i < 6; i++) {

  4314.             s->dc_val[0][s->block_index[i]] = 0;

  4315.             dst_idx += i >> 2;

  4316.             val = ((cbp >> (5 - i)) & 1);

  4317.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  4318.             if (v->second_field)

  4319.                 off += (i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0];

  4320.             if (val) {

  4321.                 vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4322.                                    first_block, s->dest[dst_idx] + off,

  4323.                                    (i & 4) ? s->uvlinesize : s->linesize,

  4324.                                    (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4325.                 if (!v->ttmbf && ttmb < 8)

  4326.                     ttmb = -1;

  4327.                 first_block = 0;

  4328.             }

  4329.         }

  4330.     }

  4331. }

  4332. 

  4333. /** Decode blocks of I-frame

  4334.  */

  4335. static void vc1_decode_i_blocks(VC1Context *v)

  4336. {

  4337.     int k, j;

  4338.     MpegEncContext *s = &v->s;

  4339.     int cbp, val;

  4340.     uint8_t *coded_val;

  4341.     int mb_pos;

  4342. 

  4343.     /* select codingmode used for VLC tables selection */

  4344.     switch (v->y_ac_table_index) {

  4345.     case 0:

  4346.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4347.         break;

  4348.     case 1:

  4349.         v->codingset = CS_HIGH_MOT_INTRA;

  4350.         break;

  4351.     case 2:

  4352.         v->codingset = CS_MID_RATE_INTRA;

  4353.         break;

  4354.     }

  4355. 

  4356.     switch (v->c_ac_table_index) {

  4357.     case 0:

  4358.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4359.         break;

  4360.     case 1:

  4361.         v->codingset2 = CS_HIGH_MOT_INTER;

  4362.         break;

  4363.     case 2:

  4364.         v->codingset2 = CS_MID_RATE_INTER;

  4365.         break;

  4366.     }

  4367. 

  4368.     /* Set DC scale - y and c use the same */

  4369.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  4370.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  4371. 

  4372.     //do frame decode

  4373.     s->mb_x = s->mb_y = 0;

  4374.     s->mb_intra         = 1;

  4375.     s->first_slice_line = 1;

  4376.     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {

  4377.         s->mb_x = 0;

  4378.         ff_init_block_index(s);

  4379.         for (; s->mb_x < v->end_mb_x; s->mb_x++) {

  4380.             uint8_t *dst[6];

  4381.             ff_update_block_index(s);

  4382.             dst[0] = s->dest[0];

  4383.             dst[1] = dst[0] + 8;

  4384.             dst[2] = s->dest[0] + s->linesize * 8;

  4385.             dst[3] = dst[2] + 8;

  4386.             dst[4] = s->dest[1];

  4387.             dst[5] = s->dest[2];

  4388.             s->dsp.clear_blocks(s->block[0]);

  4389.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  4390.             s->current_picture.f.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  4391.             s->current_picture.f.qscale_table[mb_pos]                = v->pq;

  4392.             s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;

  4393.             s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;

  4394. 

  4395.             // do actual MB decoding and displaying

  4396.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4397.             v->s.ac_pred = get_bits1(&v->s.gb);

  4398. 

  4399.             for (k = 0; k < 6; k++) {

  4400.                 val = ((cbp >> (5 - k)) & 1);

  4401. 

  4402.                 if (k < 4) {

  4403.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4404.                     val        = val ^ pred;

  4405.                     *coded_val = val;

  4406.                 }

  4407.                 cbp |= val << (5 - k);

  4408. 

  4409.                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);

  4410. 

  4411.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4412.                     continue;

  4413.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);

  4414.                 if (v->pq >= 9 && v->overlap) {

  4415.                     if (v->rangeredfrm)

  4416.                         for (j = 0; j < 64; j++)

  4417.                             s->block[k][j] <<= 1;

  4418.                     s->dsp.put_signed_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4419.                 } else {

  4420.                     if (v->rangeredfrm)

  4421.                         for (j = 0; j < 64; j++)

  4422.                             s->block[k][j] = (s->block[k][j] - 64) << 1;

  4423.                     s->dsp.put_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4424.                 }

  4425.             }

  4426. 

  4427.             if (v->pq >= 9 && v->overlap) {

  4428.                 if (s->mb_x) {

  4429.                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);

  4430.                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4431.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4432.                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  4433.                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  4434.                     }

  4435.                 }

  4436.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  4437.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4438.                 if (!s->first_slice_line) {

  4439.                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);

  4440.                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  4441.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4442.                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  4443.                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  4444.                     }

  4445.                 }

  4446.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4447.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4448.             }

  4449.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  4450. 

  4451.             if (get_bits_count(&s->gb) > v->bits) {

  4452.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);

  4453.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4454.                        get_bits_count(&s->gb), v->bits);

  4455.                 return;

  4456.             }

  4457.         }

  4458.         if (!v->s.loop_filter)

  4459.             ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4460.         else if (s->mb_y)

  4461.             ff_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4462. 

  4463.         s->first_slice_line = 0;

  4464.     }

  4465.     if (v->s.loop_filter)

  4466.         ff_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4467. 

  4468.     /* This is intentionally mb_height and not end_mb_y - unlike in advanced

  4469.      * profile, these only differ are when decoding MSS2 rectangles. */

  4470.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);

  4471. }

  4472. 

  4473. /** Decode blocks of I-frame for advanced profile

  4474.  */

  4475. static void vc1_decode_i_blocks_adv(VC1Context *v)

  4476. {

  4477.     int k;

  4478.     MpegEncContext *s = &v->s;

  4479.     int cbp, val;

  4480.     uint8_t *coded_val;

  4481.     int mb_pos;

  4482.     int mquant = v->pq;

  4483.     int mqdiff;

  4484.     GetBitContext *gb = &s->gb;

  4485. 

  4486.     /* select codingmode used for VLC tables selection */

  4487.     switch (v->y_ac_table_index) {

  4488.     case 0:

  4489.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4490.         break;

  4491.     case 1:

  4492.         v->codingset = CS_HIGH_MOT_INTRA;

  4493.         break;

  4494.     case 2:

  4495.         v->codingset = CS_MID_RATE_INTRA;

  4496.         break;

  4497.     }

  4498. 

  4499.     switch (v->c_ac_table_index) {

  4500.     case 0:

  4501.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4502.         break;

  4503.     case 1:

  4504.         v->codingset2 = CS_HIGH_MOT_INTER;

  4505.         break;

  4506.     case 2:

  4507.         v->codingset2 = CS_MID_RATE_INTER;

  4508.         break;

  4509.     }

  4510. 

  4511.     // do frame decode

  4512.     s->mb_x             = s->mb_y = 0;

  4513.     s->mb_intra         = 1;

  4514.     s->first_slice_line = 1;

  4515.     s->mb_y             = s->start_mb_y;

  4516.     if (s->start_mb_y) {

  4517.         s->mb_x = 0;

  4518.         ff_init_block_index(s);

  4519.         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,

  4520.                (1 + s->b8_stride) * sizeof(*s->coded_block));

  4521.     }

  4522.     for (; s->mb_y < s->end_mb_y; s->mb_y++) {

  4523.         s->mb_x = 0;

  4524.         ff_init_block_index(s);

  4525.         for (;s->mb_x < s->mb_width; s->mb_x++) {

  4526.             int16_t (*block)[64] = v->block[v->cur_blk_idx];

  4527.             ff_update_block_index(s);

  4528.             s->dsp.clear_blocks(block[0]);

  4529.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4530.             s->current_picture.f.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;

  4531.             s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  4532.             s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  4533. 

  4534.             // do actual MB decoding and displaying

  4535.             if (v->fieldtx_is_raw)

  4536.                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);

  4537.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4538.             if ( v->acpred_is_raw)

  4539.                 v->s.ac_pred = get_bits1(&v->s.gb);

  4540.             else

  4541.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  4542. 

  4543.             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)

  4544.                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);

  4545. 

  4546.             GET_MQUANT();

  4547. 

  4548.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  4549.             /* Set DC scale - y and c use the same */

  4550.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  4551.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  4552. 

  4553.             for (k = 0; k < 6; k++) {

  4554.                 val = ((cbp >> (5 - k)) & 1);

  4555. 

  4556.                 if (k < 4) {

  4557.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4558.                     val        = val ^ pred;

  4559.                     *coded_val = val;

  4560.                 }

  4561.                 cbp |= val << (5 - k);

  4562. 

  4563.                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);

  4564.                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);

  4565. 

  4566.                 vc1_decode_i_block_adv(v, block[k], k, val,

  4567.                                        (k < 4) ? v->codingset : v->codingset2, mquant);

  4568. 

  4569.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4570.                     continue;

  4571.                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);

  4572.             }

  4573. 

  4574.             vc1_smooth_overlap_filter_iblk(v);

  4575.             vc1_put_signed_blocks_clamped(v);

  4576.             if (v->s.loop_filter) vc1_loop_filter_iblk_delayed(v, v->pq);

  4577. 

  4578.             if (get_bits_count(&s->gb) > v->bits) {

  4579.                 // TODO: may need modification to handle slice coding

  4580.                 ff_er_add_slice(s, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4581.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4582.                        get_bits_count(&s->gb), v->bits);

  4583.                 return;

  4584.             }

  4585.         }

  4586.         if (!v->s.loop_filter)

  4587.             ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4588.         else if (s->mb_y)

  4589.             ff_draw_horiz_band(s, (s->mb_y-1) * 16, 16);

  4590.         s->first_slice_line = 0;

  4591.     }

  4592. 

  4593.     /* raw bottom MB row */

  4594.     s->mb_x = 0;

  4595.     ff_init_block_index(s);

  4596.     for (;s->mb_x < s->mb_width; s->mb_x++) {

  4597.         ff_update_block_index(s);

  4598.         vc1_put_signed_blocks_clamped(v);

  4599.         if (v->s.loop_filter)

  4600.             vc1_loop_filter_iblk_delayed(v, v->pq);

  4601.     }

  4602.     if (v->s.loop_filter)

  4603.         ff_draw_horiz_band(s, (s->end_mb_y-1)*16, 16);

  4604.     ff_er_add_slice(s, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4605.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4606. }

  4607. 

  4608. static void vc1_decode_p_blocks(VC1Context *v)

  4609. {

  4610.     MpegEncContext *s = &v->s;

  4611.     int apply_loop_filter;

  4612. 

  4613.     /* select codingmode used for VLC tables selection */

  4614.     switch (v->c_ac_table_index) {

  4615.     case 0:

  4616.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4617.         break;

  4618.     case 1:

  4619.         v->codingset = CS_HIGH_MOT_INTRA;

  4620.         break;

  4621.     case 2:

  4622.         v->codingset = CS_MID_RATE_INTRA;

  4623.         break;

  4624.     }

  4625. 

  4626.     switch (v->c_ac_table_index) {

  4627.     case 0:

  4628.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4629.         break;

  4630.     case 1:

  4631.         v->codingset2 = CS_HIGH_MOT_INTER;

  4632.         break;

  4633.     case 2:

  4634.         v->codingset2 = CS_MID_RATE_INTER;

  4635.         break;

  4636.     }

  4637. 

  4638.     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY);

  4639.     s->first_slice_line = 1;

  4640.     memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);

  4641.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4642.         s->mb_x = 0;

  4643.         ff_init_block_index(s);

  4644.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4645.             ff_update_block_index(s);

  4646. 

  4647.             if (v->fcm == ILACE_FIELD)

  4648.                 vc1_decode_p_mb_intfi(v);

  4649.             else if (v->fcm == ILACE_FRAME)

  4650.                 vc1_decode_p_mb_intfr(v);

  4651.             else vc1_decode_p_mb(v);

  4652.             if (s->mb_y != s->start_mb_y && apply_loop_filter && v->fcm == PROGRESSIVE)

  4653.                 vc1_apply_p_loop_filter(v);

  4654.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4655.                 // TODO: may need modification to handle slice coding

  4656.                 ff_er_add_slice(s, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4657.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  4658.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  4659.                 return;

  4660.             }

  4661.         }

  4662.         memmove(v->cbp_base,      v->cbp,      sizeof(v->cbp_base[0])      * s->mb_stride);

  4663.         memmove(v->ttblk_base,    v->ttblk,    sizeof(v->ttblk_base[0])    * s->mb_stride);

  4664.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4665.         memmove(v->luma_mv_base,  v->luma_mv,  sizeof(v->luma_mv_base[0])  * s->mb_stride);

  4666.         if (s->mb_y != s->start_mb_y) ff_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4667.         s->first_slice_line = 0;

  4668.     }

  4669.     if (apply_loop_filter && v->fcm == PROGRESSIVE) {

  4670.         s->mb_x = 0;

  4671.         ff_init_block_index(s);

  4672.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4673.             ff_update_block_index(s);

  4674.             vc1_apply_p_loop_filter(v);

  4675.         }

  4676.     }

  4677.     if (s->end_mb_y >= s->start_mb_y)

  4678.         ff_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4679.     ff_er_add_slice(s, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4680.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4681. }

  4682. 

  4683. static void vc1_decode_b_blocks(VC1Context *v)

  4684. {

  4685.     MpegEncContext *s = &v->s;

  4686. 

  4687.     /* select codingmode used for VLC tables selection */

  4688.     switch (v->c_ac_table_index) {

  4689.     case 0:

  4690.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4691.         break;

  4692.     case 1:

  4693.         v->codingset = CS_HIGH_MOT_INTRA;

  4694.         break;

  4695.     case 2:

  4696.         v->codingset = CS_MID_RATE_INTRA;

  4697.         break;

  4698.     }

  4699. 

  4700.     switch (v->c_ac_table_index) {

  4701.     case 0:

  4702.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4703.         break;

  4704.     case 1:

  4705.         v->codingset2 = CS_HIGH_MOT_INTER;

  4706.         break;

  4707.     case 2:

  4708.         v->codingset2 = CS_MID_RATE_INTER;

  4709.         break;

  4710.     }

  4711. 

  4712.     s->first_slice_line = 1;

  4713.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4714.         s->mb_x = 0;

  4715.         ff_init_block_index(s);

  4716.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4717.             ff_update_block_index(s);

  4718. 

  4719.             if (v->fcm == ILACE_FIELD)

  4720.                 vc1_decode_b_mb_intfi(v);

  4721.             else

  4722.                 vc1_decode_b_mb(v);

  4723.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4724.                 // TODO: may need modification to handle slice coding

  4725.                 ff_er_add_slice(s, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4726.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  4727.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  4728.                 return;

  4729.             }

  4730.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  4731.         }

  4732.         if (!v->s.loop_filter)

  4733.             ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4734.         else if (s->mb_y)

  4735.             ff_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4736.         s->first_slice_line = 0;

  4737.     }

  4738.     if (v->s.loop_filter)

  4739.         ff_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4740.     ff_er_add_slice(s, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4741.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4742. }

  4743. 

  4744. static void vc1_decode_skip_blocks(VC1Context *v)

  4745. {

  4746.     MpegEncContext *s = &v->s;

  4747. 

  4748.     ff_er_add_slice(s, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);

  4749.     s->first_slice_line = 1;

  4750.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4751.         s->mb_x = 0;

  4752.         ff_init_block_index(s);

  4753.         ff_update_block_index(s);

  4754.         if (s->last_picture.f.data[0]) {

  4755.             memcpy(s->dest[0], s->last_picture.f.data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);

  4756.             memcpy(s->dest[1], s->last_picture.f.data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  4757.             memcpy(s->dest[2], s->last_picture.f.data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  4758.         }

  4759.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4760.         s->first_slice_line = 0;

  4761.     }

  4762.     s->pict_type = AV_PICTURE_TYPE_P;

  4763. }

  4764. 

  4765. void ff_vc1_decode_blocks(VC1Context *v)

  4766. {

  4767. 

  4768.     v->s.esc3_level_length = 0;

  4769.     if (v->x8_type) {

  4770.         ff_intrax8_decode_picture(&v->x8, 2*v->pq + v->halfpq, v->pq * !v->pquantizer);

  4771.     } else {

  4772.         v->cur_blk_idx     =  0;

  4773.         v->left_blk_idx    = -1;

  4774.         v->topleft_blk_idx =  1;

  4775.         v->top_blk_idx     =  2;

  4776.         switch (v->s.pict_type) {

  4777.         case AV_PICTURE_TYPE_I:

  4778.             if (v->profile == PROFILE_ADVANCED)

  4779.                 vc1_decode_i_blocks_adv(v);

  4780.             else

  4781.                 vc1_decode_i_blocks(v);

  4782.             break;

  4783.         case AV_PICTURE_TYPE_P:

  4784.             if (v->p_frame_skipped)

  4785.                 vc1_decode_skip_blocks(v);

  4786.             else

  4787.                 vc1_decode_p_blocks(v);

  4788.             break;

  4789.         case AV_PICTURE_TYPE_B:

  4790.             if (v->bi_type) {

  4791.                 if (v->profile == PROFILE_ADVANCED)

  4792.                     vc1_decode_i_blocks_adv(v);

  4793.                 else

  4794.                     vc1_decode_i_blocks(v);

  4795.             } else

  4796.                 vc1_decode_b_blocks(v);

  4797.             break;

  4798.         }

  4799.     }

  4800. }

  4801. 

  4802. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  4803. 

  4804. typedef struct {

  4805.     /**

  4806.      * Transform coefficients for both sprites in 16.16 fixed point format,

  4807.      * in the order they appear in the bitstream:

  4808.      *  x scale

  4809.      *  rotation 1 (unused)

  4810.      *  x offset

  4811.      *  rotation 2 (unused)

  4812.      *  y scale

  4813.      *  y offset

  4814.      *  alpha

  4815.      */

  4816.     int coefs[2][7];

  4817. 

  4818.     int effect_type, effect_flag;

  4819.     int effect_pcount1, effect_pcount2;   ///< amount of effect parameters stored in effect_params

  4820.     int effect_params1[15], effect_params2[10]; ///< effect parameters in 16.16 fixed point format

  4821. } SpriteData;

  4822. 

  4823. static inline int get_fp_val(GetBitContext* gb)

  4824. {

  4825.     return (get_bits_long(gb, 30) - (1 << 29)) << 1;

  4826. }

  4827. 

  4828. static void vc1_sprite_parse_transform(GetBitContext* gb, int c[7])

  4829. {

  4830.     c[1] = c[3] = 0;

  4831. 

  4832.     switch (get_bits(gb, 2)) {

  4833.     case 0:

  4834.         c[0] = 1 << 16;

  4835.         c[2] = get_fp_val(gb);

  4836.         c[4] = 1 << 16;

  4837.         break;

  4838.     case 1:

  4839.         c[0] = c[4] = get_fp_val(gb);

  4840.         c[2] = get_fp_val(gb);

  4841.         break;

  4842.     case 2:

  4843.         c[0] = get_fp_val(gb);

  4844.         c[2] = get_fp_val(gb);

  4845.         c[4] = get_fp_val(gb);

  4846.         break;

  4847.     case 3:

  4848.         c[0] = get_fp_val(gb);

  4849.         c[1] = get_fp_val(gb);

  4850.         c[2] = get_fp_val(gb);

  4851.         c[3] = get_fp_val(gb);

  4852.         c[4] = get_fp_val(gb);

  4853.         break;

  4854.     }

  4855.     c[5] = get_fp_val(gb);

  4856.     if (get_bits1(gb))

  4857.         c[6] = get_fp_val(gb);

  4858.     else

  4859.         c[6] = 1 << 16;

  4860. }

  4861. 

  4862. static void vc1_parse_sprites(VC1Context *v, GetBitContext* gb, SpriteData* sd)

  4863. {

  4864.     AVCodecContext *avctx = v->s.avctx;

  4865.     int sprite, i;

  4866. 

  4867.     for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  4868.         vc1_sprite_parse_transform(gb, sd->coefs[sprite]);

  4869.         if (sd->coefs[sprite][1] || sd->coefs[sprite][3])

  4870.             av_log_ask_for_sample(avctx, "Rotation coefficients are not zero");

  4871.         av_log(avctx, AV_LOG_DEBUG, sprite ? "S2:" : "S1:");

  4872.         for (i = 0; i < 7; i++)

  4873.             av_log(avctx, AV_LOG_DEBUG, " %d.%.3d",

  4874.                    sd->coefs[sprite][i] / (1<<16),

  4875.                    (abs(sd->coefs[sprite][i]) & 0xFFFF) * 1000 / (1 << 16));

  4876.         av_log(avctx, AV_LOG_DEBUG, "\n");

  4877.     }

  4878. 

  4879.     skip_bits(gb, 2);

  4880.     if (sd->effect_type = get_bits_long(gb, 30)) {

  4881.         switch (sd->effect_pcount1 = get_bits(gb, 4)) {

  4882.         case 7:

  4883.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  4884.             break;

  4885.         case 14:

  4886.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  4887.             vc1_sprite_parse_transform(gb, sd->effect_params1 + 7);

  4888.             break;

  4889.         default:

  4890.             for (i = 0; i < sd->effect_pcount1; i++)

  4891.                 sd->effect_params1[i] = get_fp_val(gb);

  4892.         }

  4893.         if (sd->effect_type != 13 || sd->effect_params1[0] != sd->coefs[0][6]) {

  4894.             // effect 13 is simple alpha blending and matches the opacity above

  4895.             av_log(avctx, AV_LOG_DEBUG, "Effect: %d; params: ", sd->effect_type);

  4896.             for (i = 0; i < sd->effect_pcount1; i++)

  4897.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  4898.                        sd->effect_params1[i] / (1 << 16),

  4899.                        (abs(sd->effect_params1[i]) & 0xFFFF) * 1000 / (1 << 16));

  4900.             av_log(avctx, AV_LOG_DEBUG, "\n");

  4901.         }

  4902. 

  4903.         sd->effect_pcount2 = get_bits(gb, 16);

  4904.         if (sd->effect_pcount2 > 10) {

  4905.             av_log(avctx, AV_LOG_ERROR, "Too many effect parameters\n");

  4906.             return;

  4907.         } else if (sd->effect_pcount2) {

  4908.             i = -1;

  4909.             av_log(avctx, AV_LOG_DEBUG, "Effect params 2: ");

  4910.             while (++i < sd->effect_pcount2) {

  4911.                 sd->effect_params2[i] = get_fp_val(gb);

  4912.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  4913.                        sd->effect_params2[i] / (1 << 16),

  4914.                        (abs(sd->effect_params2[i]) & 0xFFFF) * 1000 / (1 << 16));

  4915.             }

  4916.             av_log(avctx, AV_LOG_DEBUG, "\n");

  4917.         }

  4918.     }

  4919.     if (sd->effect_flag = get_bits1(gb))

  4920.         av_log(avctx, AV_LOG_DEBUG, "Effect flag set\n");

  4921. 

  4922.     if (get_bits_count(gb) >= gb->size_in_bits +

  4923.        (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE ? 64 : 0))

  4924.         av_log(avctx, AV_LOG_ERROR, "Buffer overrun\n");

  4925.     if (get_bits_count(gb) < gb->size_in_bits - 8)

  4926.         av_log(avctx, AV_LOG_WARNING, "Buffer not fully read\n");

  4927. }

  4928. 

  4929. static void vc1_draw_sprites(VC1Context *v, SpriteData* sd)

  4930. {

  4931.     int i, plane, row, sprite;

  4932.     int sr_cache[2][2] = { { -1, -1 }, { -1, -1 } };

  4933.     uint8_t* src_h[2][2];

  4934.     int xoff[2], xadv[2], yoff[2], yadv[2], alpha;

  4935.     int ysub[2];

  4936.     MpegEncContext *s = &v->s;

  4937. 

  4938.     for (i = 0; i < 2; i++) {

  4939.         xoff[i] = av_clip(sd->coefs[i][2], 0, v->sprite_width-1 << 16);

  4940.         xadv[i] = sd->coefs[i][0];

  4941.         if (xadv[i] != 1<<16 || (v->sprite_width << 16) - (v->output_width << 16) - xoff[i])

  4942.             xadv[i] = av_clip(xadv[i], 0, ((v->sprite_width<<16) - xoff[i] - 1) / v->output_width);

  4943. 

  4944.         yoff[i] = av_clip(sd->coefs[i][5], 0, v->sprite_height-1 << 16);

  4945.         yadv[i] = av_clip(sd->coefs[i][4], 0, ((v->sprite_height << 16) - yoff[i]) / v->output_height);

  4946.     }

  4947.     alpha = av_clip(sd->coefs[1][6], 0, (1<<16) - 1);

  4948. 

  4949.     for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++) {

  4950.         int width = v->output_width>>!!plane;

  4951. 

  4952.         for (row = 0; row < v->output_height>>!!plane; row++) {

  4953.             uint8_t *dst = v->sprite_output_frame.data[plane] +

  4954.                            v->sprite_output_frame.linesize[plane] * row;

  4955. 

  4956.             for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  4957.                 uint8_t *iplane = s->current_picture.f.data[plane];

  4958.                 int      iline  = s->current_picture.f.linesize[plane];

  4959.                 int      ycoord = yoff[sprite] + yadv[sprite] * row;

  4960.                 int      yline  = ycoord >> 16;

  4961.                 int      next_line;

  4962.                 ysub[sprite] = ycoord & 0xFFFF;

  4963.                 if (sprite) {

  4964.                     iplane = s->last_picture.f.data[plane];

  4965.                     iline  = s->last_picture.f.linesize[plane];

  4966.                 }

  4967.                 next_line = FFMIN(yline + 1, (v->sprite_height >> !!plane) - 1) * iline;

  4968.                 if (!(xoff[sprite] & 0xFFFF) && xadv[sprite] == 1 << 16) {

  4969.                         src_h[sprite][0] = iplane + (xoff[sprite] >> 16) +  yline      * iline;

  4970.                     if (ysub[sprite])

  4971.                         src_h[sprite][1] = iplane + (xoff[sprite] >> 16) + next_line;

  4972.                 } else {

  4973.                     if (sr_cache[sprite][0] != yline) {

  4974.                         if (sr_cache[sprite][1] == yline) {

  4975.                             FFSWAP(uint8_t*, v->sr_rows[sprite][0], v->sr_rows[sprite][1]);

  4976.                             FFSWAP(int,        sr_cache[sprite][0],   sr_cache[sprite][1]);

  4977.                         } else {

  4978.                             v->vc1dsp.sprite_h(v->sr_rows[sprite][0], iplane + yline * iline, xoff[sprite], xadv[sprite], width);

  4979.                             sr_cache[sprite][0] = yline;

  4980.                         }

  4981.                     }

  4982.                     if (ysub[sprite] && sr_cache[sprite][1] != yline + 1) {

  4983.                         v->vc1dsp.sprite_h(v->sr_rows[sprite][1],

  4984.                                            iplane + next_line, xoff[sprite],

  4985.                                            xadv[sprite], width);

  4986.                         sr_cache[sprite][1] = yline + 1;

  4987.                     }

  4988.                     src_h[sprite][0] = v->sr_rows[sprite][0];

  4989.                     src_h[sprite][1] = v->sr_rows[sprite][1];

  4990.                 }

  4991.             }

  4992. 

  4993.             if (!v->two_sprites) {

  4994.                 if (ysub[0]) {

  4995.                     v->vc1dsp.sprite_v_single(dst, src_h[0][0], src_h[0][1], ysub[0], width);

  4996.                 } else {

  4997.                     memcpy(dst, src_h[0][0], width);

  4998.                 }

  4999.             } else {

  5000.                 if (ysub[0] && ysub[1]) {

  5001.                     v->vc1dsp.sprite_v_double_twoscale(dst, src_h[0][0], src_h[0][1], ysub[0],

  5002.                                                        src_h[1][0], src_h[1][1], ysub[1], alpha, width);

  5003.                 } else if (ysub[0]) {

  5004.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[0][0], src_h[0][1], ysub[0],

  5005.                                                        src_h[1][0], alpha, width);

  5006.                 } else if (ysub[1]) {

  5007.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[1][0], src_h[1][1], ysub[1],

  5008.                                                        src_h[0][0], (1<<16)-1-alpha, width);

  5009.                 } else {

  5010.                     v->vc1dsp.sprite_v_double_noscale(dst, src_h[0][0], src_h[1][0], alpha, width);

  5011.                 }

  5012.             }

  5013.         }

  5014. 

  5015.         if (!plane) {

  5016.             for (i = 0; i < 2; i++) {

  5017.                 xoff[i] >>= 1;

  5018.                 yoff[i] >>= 1;

  5019.             }

  5020.         }

  5021. 

  5022.     }

  5023. }

  5024. 

  5025. 

  5026. static int vc1_decode_sprites(VC1Context *v, GetBitContext* gb)

  5027. {

  5028.     MpegEncContext *s     = &v->s;

  5029.     AVCodecContext *avctx = s->avctx;

  5030.     SpriteData sd;

  5031. 

  5032.     vc1_parse_sprites(v, gb, &sd);

  5033. 

  5034.     if (!s->current_picture.f.data[0]) {

  5035.         av_log(avctx, AV_LOG_ERROR, "Got no sprites\n");

  5036.         return -1;

  5037.     }

  5038. 

  5039.     if (v->two_sprites && (!s->last_picture_ptr || !s->last_picture.f.data[0])) {

  5040.         av_log(avctx, AV_LOG_WARNING, "Need two sprites, only got one\n");

  5041.         v->two_sprites = 0;

  5042.     }

  5043. 

  5044.     if (v->sprite_output_frame.data[0])

  5045.         avctx->release_buffer(avctx, &v->sprite_output_frame);

  5046. 

  5047.     v->sprite_output_frame.buffer_hints = FF_BUFFER_HINTS_VALID;

  5048.     v->sprite_output_frame.reference = 0;

  5049.     if (ff_get_buffer(avctx, &v->sprite_output_frame) < 0) {

  5050.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  5051.         return -1;

  5052.     }

  5053. 

  5054.     vc1_draw_sprites(v, &sd);

  5055. 

  5056.     return 0;

  5057. }

  5058. 

  5059. static void vc1_sprite_flush(AVCodecContext *avctx)

  5060. {

  5061.     VC1Context *v     = avctx->priv_data;

  5062.     MpegEncContext *s = &v->s;

  5063.     AVFrame *f = &s->current_picture.f;

  5064.     int plane, i;

  5065. 

  5066.     /* Windows Media Image codecs have a convergence interval of two keyframes.

  5067.        Since we can't enforce it, clear to black the missing sprite. This is

  5068.        wrong but it looks better than doing nothing. */

  5069. 

  5070.     if (f->data[0])

  5071.         for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++)

  5072.             for (i = 0; i < v->sprite_height>>!!plane; i++)

  5073.                 memset(f->data[plane] + i * f->linesize[plane],

  5074.                        plane ? 128 : 0, f->linesize[plane]);

  5075. }

  5076. 

  5077. #endif

  5078. 

  5079. av_cold int ff_vc1_decode_init_alloc_tables(VC1Context *v)

  5080. {

  5081.     MpegEncContext *s = &v->s;

  5082.     int i;

  5083. 

  5084.     /* Allocate mb bitplanes */

  5085.     v->mv_type_mb_plane = av_malloc (s->mb_stride * s->mb_height);

  5086.     v->direct_mb_plane  = av_malloc (s->mb_stride * s->mb_height);

  5087.     v->forward_mb_plane = av_malloc (s->mb_stride * s->mb_height);

  5088.     v->fieldtx_plane    = av_mallocz(s->mb_stride * s->mb_height);

  5089.     v->acpred_plane     = av_malloc (s->mb_stride * s->mb_height);

  5090.     v->over_flags_plane = av_malloc (s->mb_stride * s->mb_height);

  5091. 

  5092.     v->n_allocated_blks = s->mb_width + 2;

  5093.     v->block            = av_malloc(sizeof(*v->block) * v->n_allocated_blks);

  5094.     v->cbp_base         = av_malloc(sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  5095.     v->cbp              = v->cbp_base + s->mb_stride;

  5096.     v->ttblk_base       = av_malloc(sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  5097.     v->ttblk            = v->ttblk_base + s->mb_stride;

  5098.     v->is_intra_base    = av_mallocz(sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  5099.     v->is_intra         = v->is_intra_base + s->mb_stride;

  5100.     v->luma_mv_base     = av_malloc(sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);

  5101.     v->luma_mv          = v->luma_mv_base + s->mb_stride;

  5102. 

  5103.     /* allocate block type info in that way so it could be used with s->block_index[] */

  5104.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5105.     v->mb_type[0]   = v->mb_type_base + s->b8_stride + 1;

  5106.     v->mb_type[1]   = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  5107.     v->mb_type[2]   = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  5108. 

  5109.     /* allocate memory to store block level MV info */

  5110.     v->blk_mv_type_base = av_mallocz(     s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5111.     v->blk_mv_type      = v->blk_mv_type_base + s->b8_stride + 1;

  5112.     v->mv_f_base        = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5113.     v->mv_f[0]          = v->mv_f_base + s->b8_stride + 1;

  5114.     v->mv_f[1]          = v->mv_f[0] + (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5115.     v->mv_f_last_base   = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5116.     v->mv_f_last[0]     = v->mv_f_last_base + s->b8_stride + 1;

  5117.     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);

  5118.     v->mv_f_next_base   = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5119.     v->mv_f_next[0]     = v->mv_f_next_base + s->b8_stride + 1;

  5120.     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);

  5121. 

  5122.     /* Init coded blocks info */

  5123.     if (v->profile == PROFILE_ADVANCED) {

  5124. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  5125. //            return -1;

  5126. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  5127. //            return -1;

  5128.     }

  5129. 

  5130.     ff_intrax8_common_init(&v->x8,s);

  5131. 

  5132.     if (s->avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || s->avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5133.         for (i = 0; i < 4; i++)

  5134.             if (!(v->sr_rows[i >> 1][i & 1] = av_malloc(v->output_width))) return -1;

  5135.     }

  5136. 

  5137.     if (!v->mv_type_mb_plane || !v->direct_mb_plane || !v->acpred_plane || !v->over_flags_plane ||

  5138.         !v->block || !v->cbp_base || !v->ttblk_base || !v->is_intra_base || !v->luma_mv_base ||

  5139.         !v->mb_type_base)

  5140.             return -1;

  5141. 

  5142.     return 0;

  5143. }

  5144. 

  5145. av_cold void ff_vc1_init_transposed_scantables(VC1Context *v)

  5146. {

  5147.     int i;

  5148.     for (i = 0; i < 64; i++) {

  5149. #define transpose(x) ((x >> 3) | ((x & 7) << 3))

  5150.         v->zz_8x8[0][i] = transpose(ff_wmv1_scantable[0][i]);

  5151.         v->zz_8x8[1][i] = transpose(ff_wmv1_scantable[1][i]);

  5152.         v->zz_8x8[2][i] = transpose(ff_wmv1_scantable[2][i]);

  5153.         v->zz_8x8[3][i] = transpose(ff_wmv1_scantable[3][i]);

  5154.         v->zzi_8x8[i]   = transpose(ff_vc1_adv_interlaced_8x8_zz[i]);

  5155.     }

  5156.     v->left_blk_sh = 0;

  5157.     v->top_blk_sh  = 3;

  5158. }

  5159. 

  5160. /** Initialize a VC1/WMV3 decoder

  5161.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5162.  * @todo TODO: Decypher remaining bits in extra_data

  5163.  */

  5164. static av_cold int vc1_decode_init(AVCodecContext *avctx)

  5165. {

  5166.     VC1Context *v = avctx->priv_data;

  5167.     MpegEncContext *s = &v->s;

  5168.     GetBitContext gb;

  5169. 

  5170.     /* save the container output size for WMImage */

  5171.     v->output_width  = avctx->width;

  5172.     v->output_height = avctx->height;

  5173. 

  5174.     if (!avctx->extradata_size || !avctx->extradata)

  5175.         return -1;

  5176.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  5177.         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);

  5178.     else

  5179.         avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  5180.     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);

  5181.     v->s.avctx = avctx;

  5182.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  5183.     v->s.flags   |= CODEC_FLAG_EMU_EDGE;

  5184. 

  5185.     if (ff_vc1_init_common(v) < 0)

  5186.         return -1;

  5187.     // ensure static VLC tables are initialized

  5188.     if (ff_msmpeg4_decode_init(avctx) < 0)

  5189.         return -1;

  5190.     if (ff_vc1_decode_init_alloc_tables(v) < 0)

  5191.         return -1;

  5192.     // Hack to ensure the above functions will be called

  5193.     // again once we know all necessary settings.

  5194.     // That this is necessary might indicate a bug.

  5195.     ff_vc1_decode_end(avctx);

  5196.     ff_vc1dsp_init(&v->vc1dsp);

  5197. 

  5198.     if (avctx->codec_id == AV_CODEC_ID_WMV3 || avctx->codec_id == AV_CODEC_ID_WMV3IMAGE) {

  5199.         int count = 0;

  5200. 

  5201.         // looks like WMV3 has a sequence header stored in the extradata

  5202.         // advanced sequence header may be before the first frame

  5203.         // the last byte of the extradata is a version number, 1 for the

  5204.         // samples we can decode

  5205. 

  5206.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  5207. 

  5208.         if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0)

  5209.           return -1;

  5210. 

  5211.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  5212.         if (count > 0) {

  5213.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  5214.                    count, get_bits(&gb, count));

  5215.         } else if (count < 0) {

  5216.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  5217.         }

  5218.     } else { // VC1/WVC1/WVP2

  5219.         const uint8_t *start = avctx->extradata;

  5220.         uint8_t *end = avctx->extradata + avctx->extradata_size;

  5221.         const uint8_t *next;

  5222.         int size, buf2_size;

  5223.         uint8_t *buf2 = NULL;

  5224.         int seq_initialized = 0, ep_initialized = 0;

  5225. 

  5226.         if (avctx->extradata_size < 16) {

  5227.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  5228.             return -1;

  5229.         }

  5230. 

  5231.         buf2  = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5232.         start = find_next_marker(start, end); // in WVC1 extradata first byte is its size, but can be 0 in mkv

  5233.         next  = start;

  5234.         for (; next < end; start = next) {

  5235.             next = find_next_marker(start + 4, end);

  5236.             size = next - start - 4;

  5237.             if (size <= 0)

  5238.                 continue;

  5239.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  5240.             init_get_bits(&gb, buf2, buf2_size * 8);

  5241.             switch (AV_RB32(start)) {

  5242.             case VC1_CODE_SEQHDR:

  5243.                 if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0) {

  5244.                     av_free(buf2);

  5245.                     return -1;

  5246.                 }

  5247.                 seq_initialized = 1;

  5248.                 break;

  5249.             case VC1_CODE_ENTRYPOINT:

  5250.                 if (ff_vc1_decode_entry_point(avctx, v, &gb) < 0) {

  5251.                     av_free(buf2);

  5252.                     return -1;

  5253.                 }

  5254.                 ep_initialized = 1;

  5255.                 break;

  5256.             }

  5257.         }

  5258.         av_free(buf2);

  5259.         if (!seq_initialized || !ep_initialized) {

  5260.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  5261.             return -1;

  5262.         }

  5263.         v->res_sprite = (avctx->codec_tag == MKTAG('W','V','P','2'));

  5264.     }

  5265. 

  5266.     avctx->profile = v->profile;

  5267.     if (v->profile == PROFILE_ADVANCED)

  5268.         avctx->level = v->level;

  5269. 

  5270.     avctx->has_b_frames = !!avctx->max_b_frames;

  5271. 

  5272.     s->mb_width  = (avctx->coded_width  + 15) >> 4;

  5273.     s->mb_height = (avctx->coded_height + 15) >> 4;

  5274. 

  5275.     if (v->profile == PROFILE_ADVANCED || v->res_fasttx) {

  5276.         ff_vc1_init_transposed_scantables(v);

  5277.     } else {

  5278.         memcpy(v->zz_8x8, ff_wmv1_scantable, 4*64);

  5279.         v->left_blk_sh = 3;

  5280.         v->top_blk_sh  = 0;

  5281.     }

  5282. 

  5283.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5284.         v->sprite_width  = avctx->coded_width;

  5285.         v->sprite_height = avctx->coded_height;

  5286. 

  5287.         avctx->coded_width  = avctx->width  = v->output_width;

  5288.         avctx->coded_height = avctx->height = v->output_height;

  5289. 

  5290.         // prevent 16.16 overflows

  5291.         if (v->sprite_width  > 1 << 14 ||

  5292.             v->sprite_height > 1 << 14 ||

  5293.             v->output_width  > 1 << 14 ||

  5294.             v->output_height > 1 << 14) return -1;

  5295.     }

  5296.     return 0;

  5297. }

  5298. 

  5299. /** Close a VC1/WMV3 decoder

  5300.  * @warning Initial try at using MpegEncContext stuff

  5301.  */

  5302. av_cold int ff_vc1_decode_end(AVCodecContext *avctx)

  5303. {

  5304.     VC1Context *v = avctx->priv_data;

  5305.     int i;

  5306. 

  5307.     if ((avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE)

  5308.         && v->sprite_output_frame.data[0])

  5309.         avctx->release_buffer(avctx, &v->sprite_output_frame);

  5310.     for (i = 0; i < 4; i++)

  5311.         av_freep(&v->sr_rows[i >> 1][i & 1]);

  5312.     av_freep(&v->hrd_rate);

  5313.     av_freep(&v->hrd_buffer);

  5314.     ff_MPV_common_end(&v->s);

  5315.     av_freep(&v->mv_type_mb_plane);

  5316.     av_freep(&v->direct_mb_plane);

  5317.     av_freep(&v->forward_mb_plane);

  5318.     av_freep(&v->fieldtx_plane);

  5319.     av_freep(&v->acpred_plane);

  5320.     av_freep(&v->over_flags_plane);

  5321.     av_freep(&v->mb_type_base);

  5322.     av_freep(&v->blk_mv_type_base);

  5323.     av_freep(&v->mv_f_base);

  5324.     av_freep(&v->mv_f_last_base);

  5325.     av_freep(&v->mv_f_next_base);

  5326.     av_freep(&v->block);

  5327.     av_freep(&v->cbp_base);

  5328.     av_freep(&v->ttblk_base);

  5329.     av_freep(&v->is_intra_base); // FIXME use v->mb_type[]

  5330.     av_freep(&v->luma_mv_base);

  5331.     ff_intrax8_common_end(&v->x8);

  5332.     return 0;

  5333. }

  5334. 

  5335. 

  5336. /** Decode a VC1/WMV3 frame

  5337.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5338.  */

  5339. static int vc1_decode_frame(AVCodecContext *avctx, void *data,

  5340.                             int *got_frame, AVPacket *avpkt)

  5341. {

  5342.     const uint8_t *buf = avpkt->data;

  5343.     int buf_size = avpkt->size, n_slices = 0, i;

  5344.     VC1Context *v = avctx->priv_data;

  5345.     MpegEncContext *s = &v->s;

  5346.     AVFrame *pict = data;

  5347.     uint8_t *buf2 = NULL;

  5348.     const uint8_t *buf_start = buf, *buf_start_second_field = NULL;

  5349.     int mb_height, n_slices1=-1;

  5350.     struct {

  5351.         uint8_t *buf;

  5352.         GetBitContext gb;

  5353.         int mby_start;

  5354.     } *slices = NULL, *tmp;

  5355. 

  5356.     v->second_field = 0;

  5357. 

  5358.     if(s->flags & CODEC_FLAG_LOW_DELAY)

  5359.         s->low_delay = 1;

  5360. 

  5361.     /* no supplementary picture */

  5362.     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == VC1_CODE_ENDOFSEQ)) {

  5363.         /* special case for last picture */

  5364.         if (s->low_delay == 0 && s->next_picture_ptr) {

  5365.             *pict = s->next_picture_ptr->f;

  5366.             s->next_picture_ptr = NULL;

  5367. 

  5368.             *got_frame = 1;

  5369.         }

  5370. 

  5371.         return buf_size;

  5372.     }

  5373. 

  5374.     if (s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {

  5375.         if (v->profile < PROFILE_ADVANCED)

  5376.             avctx->pix_fmt = AV_PIX_FMT_VDPAU_WMV3;

  5377.         else

  5378.             avctx->pix_fmt = AV_PIX_FMT_VDPAU_VC1;

  5379.     }

  5380. 

  5381.     //for advanced profile we may need to parse and unescape data

  5382.     if (avctx->codec_id == AV_CODEC_ID_VC1 || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5383.         int buf_size2 = 0;

  5384.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5385. 

  5386.         if (IS_MARKER(AV_RB32(buf))) { /* frame starts with marker and needs to be parsed */

  5387.             const uint8_t *start, *end, *next;

  5388.             int size;

  5389. 

  5390.             next = buf;

  5391.             for (start = buf, end = buf + buf_size; next < end; start = next) {

  5392.                 next = find_next_marker(start + 4, end);

  5393.                 size = next - start - 4;

  5394.                 if (size <= 0) continue;

  5395.                 switch (AV_RB32(start)) {

  5396.                 case VC1_CODE_FRAME:

  5397.                     if (avctx->hwaccel ||

  5398.                         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5399.                         buf_start = start;

  5400.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5401.                     break;

  5402.                 case VC1_CODE_FIELD: {

  5403.                     int buf_size3;

  5404.                     if (avctx->hwaccel ||

  5405.                         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5406.                         buf_start_second_field = start;

  5407.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5408.                     if (!tmp)

  5409.                         goto err;

  5410.                     slices = tmp;

  5411.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5412.                     if (!slices[n_slices].buf)

  5413.                         goto err;

  5414.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5415.                                                     slices[n_slices].buf);

  5416.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5417.                                   buf_size3 << 3);

  5418.                     /* assuming that the field marker is at the exact middle,

  5419.                        hope it's correct */

  5420.                     slices[n_slices].mby_start = s->mb_height >> 1;

  5421.                     n_slices1 = n_slices - 1; // index of the last slice of the first field

  5422.                     n_slices++;

  5423.                     break;

  5424.                 }

  5425.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  5426.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5427.                     init_get_bits(&s->gb, buf2, buf_size2 * 8);

  5428.                     ff_vc1_decode_entry_point(avctx, v, &s->gb);

  5429.                     break;

  5430.                 case VC1_CODE_SLICE: {

  5431.                     int buf_size3;

  5432.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5433.                     if (!tmp)

  5434.                         goto err;

  5435.                     slices = tmp;

  5436.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5437.                     if (!slices[n_slices].buf)

  5438.                         goto err;

  5439.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5440.                                                     slices[n_slices].buf);

  5441.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5442.                                   buf_size3 << 3);

  5443.                     slices[n_slices].mby_start = get_bits(&slices[n_slices].gb, 9);

  5444.                     n_slices++;

  5445.                     break;

  5446.                 }

  5447.                 }

  5448.             }

  5449.         } else if (v->interlace && ((buf[0] & 0xC0) == 0xC0)) { /* WVC1 interlaced stores both fields divided by marker */

  5450.             const uint8_t *divider;

  5451.             int buf_size3;

  5452. 

  5453.             divider = find_next_marker(buf, buf + buf_size);

  5454.             if ((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD) {

  5455.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  5456.                 goto err;

  5457.             } else { // found field marker, unescape second field

  5458.                 if (avctx->hwaccel ||

  5459.                     s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5460.                     buf_start_second_field = divider;

  5461.                 tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5462.                 if (!tmp)

  5463.                     goto err;

  5464.                 slices = tmp;

  5465.                 slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5466.                 if (!slices[n_slices].buf)

  5467.                     goto err;

  5468.                 buf_size3 = vc1_unescape_buffer(divider + 4, buf + buf_size - divider - 4, slices[n_slices].buf);

  5469.                 init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5470.                               buf_size3 << 3);

  5471.                 slices[n_slices].mby_start = s->mb_height >> 1;

  5472.                 n_slices1 = n_slices - 1;

  5473.                 n_slices++;

  5474.             }

  5475.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  5476.         } else {

  5477.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  5478.         }

  5479.         init_get_bits(&s->gb, buf2, buf_size2*8);

  5480.     } else

  5481.         init_get_bits(&s->gb, buf, buf_size*8);

  5482. 

  5483.     if (v->res_sprite) {

  5484.         v->new_sprite  = !get_bits1(&s->gb);

  5485.         v->two_sprites =  get_bits1(&s->gb);

  5486.         /* res_sprite means a Windows Media Image stream, AV_CODEC_ID_*IMAGE means

  5487.            we're using the sprite compositor. These are intentionally kept separate

  5488.            so you can get the raw sprites by using the wmv3 decoder for WMVP or

  5489.            the vc1 one for WVP2 */

  5490.         if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5491.             if (v->new_sprite) {

  5492.                 // switch AVCodecContext parameters to those of the sprites

  5493.                 avctx->width  = avctx->coded_width  = v->sprite_width;

  5494.                 avctx->height = avctx->coded_height = v->sprite_height;

  5495.             } else {

  5496.                 goto image;

  5497.             }

  5498.         }

  5499.     }

  5500. 

  5501.     if (s->context_initialized &&

  5502.         (s->width  != avctx->coded_width ||

  5503.          s->height != avctx->coded_height)) {

  5504.         ff_vc1_decode_end(avctx);

  5505.     }

  5506. 

  5507.     if (!s->context_initialized) {

  5508.         if (ff_msmpeg4_decode_init(avctx) < 0 || ff_vc1_decode_init_alloc_tables(v) < 0)

  5509.             goto err;

  5510. 

  5511.         s->low_delay = !avctx->has_b_frames || v->res_sprite;

  5512. 

  5513.         if (v->profile == PROFILE_ADVANCED) {

  5514.             if(avctx->coded_width<=1 || avctx->coded_height<=1)

  5515.                 goto err;

  5516.             s->h_edge_pos = avctx->coded_width;

  5517.             s->v_edge_pos = avctx->coded_height;

  5518.         }

  5519.     }

  5520. 

  5521.     /* We need to set current_picture_ptr before reading the header,

  5522.      * otherwise we cannot store anything in there. */

  5523.     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {

  5524.         int i = ff_find_unused_picture(s, 0);

  5525.         if (i < 0)

  5526.             goto err;

  5527.         s->current_picture_ptr = &s->picture[i];

  5528.     }

  5529. 

  5530.     // do parse frame header

  5531.     v->pic_header_flag = 0;

  5532.     v->first_pic_header_flag = 1;

  5533.     if (v->profile < PROFILE_ADVANCED) {

  5534.         if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {

  5535.             goto err;

  5536.         }

  5537.     } else {

  5538.         if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5539.             goto err;

  5540.         }

  5541.     }

  5542.     v->first_pic_header_flag = 0;

  5543. 

  5544.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  5545.         av_log(v->s.avctx, AV_LOG_DEBUG, "pict_type: %c\n", av_get_picture_type_char(s->pict_type));

  5546. 

  5547.     if ((avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE)

  5548.         && s->pict_type != AV_PICTURE_TYPE_I) {

  5549.         av_log(v->s.avctx, AV_LOG_ERROR, "Sprite decoder: expected I-frame\n");

  5550.         goto err;

  5551.     }

  5552. 

  5553.     if ((s->mb_height >> v->field_mode) == 0) {

  5554.         av_log(v->s.avctx, AV_LOG_ERROR, "image too short\n");

  5555.         goto err;

  5556.     }

  5557. 

  5558.     // process pulldown flags

  5559.     s->current_picture_ptr->f.repeat_pict = 0;

  5560.     // Pulldown flags are only valid when 'broadcast' has been set.

  5561.     // So ticks_per_frame will be 2

  5562.     if (v->rff) {

  5563.         // repeat field

  5564.         s->current_picture_ptr->f.repeat_pict = 1;

  5565.     } else if (v->rptfrm) {

  5566.         // repeat frames

  5567.         s->current_picture_ptr->f.repeat_pict = v->rptfrm * 2;

  5568.     }

  5569. 

  5570.     // for skipping the frame

  5571.     s->current_picture.f.pict_type = s->pict_type;

  5572.     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;

  5573. 

  5574.     /* skip B-frames if we don't have reference frames */

  5575.     if (s->last_picture_ptr == NULL && (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) {

  5576.         goto err;

  5577.     }

  5578.     if ((avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B) ||

  5579.         (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I) ||

  5580.          avctx->skip_frame >= AVDISCARD_ALL) {

  5581.         goto end;

  5582.     }

  5583. 

  5584.     if (s->next_p_frame_damaged) {

  5585.         if (s->pict_type == AV_PICTURE_TYPE_B)

  5586.             goto end;

  5587.         else

  5588.             s->next_p_frame_damaged = 0;

  5589.     }

  5590. 

  5591.     if (ff_MPV_frame_start(s, avctx) < 0) {

  5592.         goto err;

  5593.     }

  5594. 

  5595.     v->s.current_picture_ptr->f.interlaced_frame = (v->fcm != PROGRESSIVE);

  5596.     v->s.current_picture_ptr->f.top_field_first  = v->tff;

  5597. 

  5598.     s->me.qpel_put = s->dsp.put_qpel_pixels_tab;

  5599.     s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;

  5600. 

  5601.     if ((CONFIG_VC1_VDPAU_DECODER)

  5602.         &&s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5603.         ff_vdpau_vc1_decode_picture(s, buf_start, (buf + buf_size) - buf_start);

  5604.     else if (avctx->hwaccel) {

  5605.         if (v->field_mode && buf_start_second_field) {

  5606.             // decode first field

  5607.             s->picture_structure = PICT_BOTTOM_FIELD - v->tff;

  5608.             if (avctx->hwaccel->start_frame(avctx, buf_start, buf_start_second_field - buf_start) < 0)

  5609.                 goto err;

  5610.             if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_start_second_field - buf_start) < 0)

  5611.                 goto err;

  5612.             if (avctx->hwaccel->end_frame(avctx) < 0)

  5613.                 goto err;

  5614. 

  5615.             // decode second field

  5616.             s->gb = slices[n_slices1 + 1].gb;

  5617.             s->picture_structure = PICT_TOP_FIELD + v->tff;

  5618.             v->second_field = 1;

  5619.             v->pic_header_flag = 0;

  5620.             if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5621.                 av_log(avctx, AV_LOG_ERROR, "parsing header for second field failed");

  5622.                 goto err;

  5623.             }

  5624.             v->s.current_picture_ptr->f.pict_type = v->s.pict_type;

  5625. 

  5626.             if (avctx->hwaccel->start_frame(avctx, buf_start_second_field, (buf + buf_size) - buf_start_second_field) < 0)

  5627.                 goto err;

  5628.             if (avctx->hwaccel->decode_slice(avctx, buf_start_second_field, (buf + buf_size) - buf_start_second_field) < 0)

  5629.                 goto err;

  5630.             if (avctx->hwaccel->end_frame(avctx) < 0)

  5631.                 goto err;

  5632.         } else {

  5633.             s->picture_structure = PICT_FRAME;

  5634.             if (avctx->hwaccel->start_frame(avctx, buf_start, (buf + buf_size) - buf_start) < 0)

  5635.                 goto err;

  5636.             if (avctx->hwaccel->decode_slice(avctx, buf_start, (buf + buf_size) - buf_start) < 0)

  5637.                 goto err;

  5638.             if (avctx->hwaccel->end_frame(avctx) < 0)

  5639.                 goto err;

  5640.         }

  5641.     } else {

  5642.         if (v->fcm == ILACE_FRAME && s->pict_type == AV_PICTURE_TYPE_B)

  5643.             goto err; // This codepath is still incomplete thus it is disabled

  5644. 

  5645.         ff_er_frame_start(s);

  5646. 

  5647.         v->bits = buf_size * 8;

  5648.         v->end_mb_x = s->mb_width;

  5649.         if (v->field_mode) {

  5650.             uint8_t *tmp[2];

  5651.             s->current_picture.f.linesize[0] <<= 1;

  5652.             s->current_picture.f.linesize[1] <<= 1;

  5653.             s->current_picture.f.linesize[2] <<= 1;

  5654.             s->linesize                      <<= 1;

  5655.             s->uvlinesize                    <<= 1;

  5656.             tmp[0]          = v->mv_f_last[0];

  5657.             tmp[1]          = v->mv_f_last[1];

  5658.             v->mv_f_last[0] = v->mv_f_next[0];

  5659.             v->mv_f_last[1] = v->mv_f_next[1];

  5660.             v->mv_f_next[0] = v->mv_f[0];

  5661.             v->mv_f_next[1] = v->mv_f[1];

  5662.             v->mv_f[0] = tmp[0];

  5663.             v->mv_f[1] = tmp[1];

  5664.         }

  5665.         mb_height = s->mb_height >> v->field_mode;

  5666.         for (i = 0; i <= n_slices; i++) {

  5667.             if (i > 0 &&  slices[i - 1].mby_start >= mb_height) {

  5668.                 if (v->field_mode <= 0) {

  5669.                     av_log(v->s.avctx, AV_LOG_ERROR, "Slice %d starts beyond "

  5670.                            "picture boundary (%d >= %d)\n", i,

  5671.                            slices[i - 1].mby_start, mb_height);

  5672.                     continue;

  5673.                 }

  5674.                 v->second_field = 1;

  5675.                 v->blocks_off   = s->mb_width  * s->mb_height << 1;

  5676.                 v->mb_off       = s->mb_stride * s->mb_height >> 1;

  5677.             } else {

  5678.                 v->second_field = 0;

  5679.                 v->blocks_off   = 0;

  5680.                 v->mb_off       = 0;

  5681.             }

  5682.             if (i) {

  5683.                 v->pic_header_flag = 0;

  5684.                 if (v->field_mode && i == n_slices1 + 2) {

  5685.                     if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5686.                         av_log(v->s.avctx, AV_LOG_ERROR, "Field header damaged\n");

  5687.                         continue;

  5688.                     }

  5689.                 } else if (get_bits1(&s->gb)) {

  5690.                     v->pic_header_flag = 1;

  5691.                     if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5692.                         av_log(v->s.avctx, AV_LOG_ERROR, "Slice header damaged\n");

  5693.                         continue;

  5694.                     }

  5695.                 }

  5696.             }

  5697.             s->start_mb_y = (i == 0) ? 0 : FFMAX(0, slices[i-1].mby_start % mb_height);

  5698.             if (!v->field_mode || v->second_field)

  5699.                 s->end_mb_y = (i == n_slices     ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  5700.             else {

  5701.                 if (i >= n_slices) {

  5702.                     av_log(v->s.avctx, AV_LOG_ERROR, "first field slice count too large\n");

  5703.                     continue;

  5704.                 }

  5705.                 s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  5706.             }

  5707.             if (s->end_mb_y <= s->start_mb_y) {

  5708.                 av_log(v->s.avctx, AV_LOG_ERROR, "end mb y %d %d invalid\n", s->end_mb_y, s->start_mb_y);

  5709.                 continue;

  5710.             }

  5711.             if (!v->p_frame_skipped && s->pict_type != AV_PICTURE_TYPE_I && !v->cbpcy_vlc) {

  5712.                 av_log(v->s.avctx, AV_LOG_ERROR, "missing cbpcy_vlc\n");

  5713.                 continue;

  5714.             }

  5715.             ff_vc1_decode_blocks(v);

  5716.             if (i != n_slices)

  5717.                 s->gb = slices[i].gb;

  5718.         }

  5719.         if (v->field_mode) {

  5720.             v->second_field = 0;

  5721.             if (s->pict_type == AV_PICTURE_TYPE_B) {

  5722.                 memcpy(v->mv_f_base, v->mv_f_next_base,

  5723.                        2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5724.             }

  5725.             s->current_picture.f.linesize[0] >>= 1;

  5726.             s->current_picture.f.linesize[1] >>= 1;

  5727.             s->current_picture.f.linesize[2] >>= 1;

  5728.             s->linesize                      >>= 1;

  5729.             s->uvlinesize                    >>= 1;

  5730.         }

  5731.         av_dlog(s->avctx, "Consumed %i/%i bits\n",

  5732.                 get_bits_count(&s->gb), s->gb.size_in_bits);

  5733. //  if (get_bits_count(&s->gb) > buf_size * 8)

  5734. //      return -1;

  5735.         if(s->error_occurred && s->pict_type == AV_PICTURE_TYPE_B)

  5736.             goto err;

  5737.         if(!v->field_mode)

  5738.             ff_er_frame_end(s);

  5739.     }

  5740. 

  5741.     ff_MPV_frame_end(s);

  5742. 

  5743.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5744. image:

  5745.         avctx->width  = avctx->coded_width  = v->output_width;

  5746.         avctx->height = avctx->coded_height = v->output_height;

  5747.         if (avctx->skip_frame >= AVDISCARD_NONREF)

  5748.             goto end;

  5749. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  5750.         if (vc1_decode_sprites(v, &s->gb))

  5751.             goto err;

  5752. #endif

  5753.         *pict      = v->sprite_output_frame;

  5754.         *got_frame = 1;

  5755.     } else {

  5756.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  5757.             *pict = s->current_picture_ptr->f;

  5758.         } else if (s->last_picture_ptr != NULL) {

  5759.             *pict = s->last_picture_ptr->f;

  5760.         }

  5761.         if (s->last_picture_ptr || s->low_delay) {

  5762.             *got_frame = 1;

  5763.             ff_print_debug_info(s, pict);

  5764.         }

  5765.     }

  5766. 

  5767. end:

  5768.     av_free(buf2);

  5769.     for (i = 0; i < n_slices; i++)

  5770.         av_free(slices[i].buf);

  5771.     av_free(slices);

  5772.     return buf_size;

  5773. 

  5774. err:

  5775.     av_free(buf2);

  5776.     for (i = 0; i < n_slices; i++)

  5777.         av_free(slices[i].buf);

  5778.     av_free(slices);

  5779.     return -1;

  5780. }

  5781. 

  5782. 

  5783. static const AVProfile profiles[] = {

  5784.     { FF_PROFILE_VC1_SIMPLE,   "Simple"   },

  5785.     { FF_PROFILE_VC1_MAIN,     "Main"     },

  5786.     { FF_PROFILE_VC1_COMPLEX,  "Complex"  },

  5787.     { FF_PROFILE_VC1_ADVANCED, "Advanced" },

  5788.     { FF_PROFILE_UNKNOWN },

  5789. };

  5790. 

  5791. AVCodec ff_vc1_decoder = {

  5792.     .name           = "vc1",

  5793.     .type           = AVMEDIA_TYPE_VIDEO,

  5794.     .id             = AV_CODEC_ID_VC1,

  5795.     .priv_data_size = sizeof(VC1Context),

  5796.     .init           = vc1_decode_init,

  5797.     .close          = ff_vc1_decode_end,

  5798.     .decode         = vc1_decode_frame,

  5799.     .flush          = ff_mpeg_flush,

  5800.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  5801.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1"),

  5802.     .pix_fmts       = ff_hwaccel_pixfmt_list_420,

  5803.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5804. };

  5805. 

  5806. #if CONFIG_WMV3_DECODER

  5807. AVCodec ff_wmv3_decoder = {

  5808.     .name           = "wmv3",

  5809.     .type           = AVMEDIA_TYPE_VIDEO,

  5810.     .id             = AV_CODEC_ID_WMV3,

  5811.     .priv_data_size = sizeof(VC1Context),

  5812.     .init           = vc1_decode_init,

  5813.     .close          = ff_vc1_decode_end,

  5814.     .decode         = vc1_decode_frame,

  5815.     .flush          = ff_mpeg_flush,

  5816.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  5817.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9"),

  5818.     .pix_fmts       = ff_hwaccel_pixfmt_list_420,

  5819.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5820. };

  5821. #endif

  5822. 

  5823. #if CONFIG_WMV3_VDPAU_DECODER

  5824. AVCodec ff_wmv3_vdpau_decoder = {

  5825.     .name           = "wmv3_vdpau",

  5826.     .type           = AVMEDIA_TYPE_VIDEO,

  5827.     .id             = AV_CODEC_ID_WMV3,

  5828.     .priv_data_size = sizeof(VC1Context),

  5829.     .init           = vc1_decode_init,

  5830.     .close          = ff_vc1_decode_end,

  5831.     .decode         = vc1_decode_frame,

  5832.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,

  5833.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 VDPAU"),

  5834.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_WMV3, AV_PIX_FMT_NONE },

  5835.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5836. };

  5837. #endif

  5838. 

  5839. #if CONFIG_VC1_VDPAU_DECODER

  5840. AVCodec ff_vc1_vdpau_decoder = {

  5841.     .name           = "vc1_vdpau",

  5842.     .type           = AVMEDIA_TYPE_VIDEO,

  5843.     .id             = AV_CODEC_ID_VC1,

  5844.     .priv_data_size = sizeof(VC1Context),

  5845.     .init           = vc1_decode_init,

  5846.     .close          = ff_vc1_decode_end,

  5847.     .decode         = vc1_decode_frame,

  5848.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,

  5849.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1 VDPAU"),

  5850.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_VC1, AV_PIX_FMT_NONE },

  5851.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5852. };

  5853. #endif

  5854. 

  5855. #if CONFIG_WMV3IMAGE_DECODER

  5856. AVCodec ff_wmv3image_decoder = {

  5857.     .name           = "wmv3image",

  5858.     .type           = AVMEDIA_TYPE_VIDEO,

  5859.     .id             = AV_CODEC_ID_WMV3IMAGE,

  5860.     .priv_data_size = sizeof(VC1Context),

  5861.     .init           = vc1_decode_init,

  5862.     .close          = ff_vc1_decode_end,

  5863.     .decode         = vc1_decode_frame,

  5864.     .capabilities   = CODEC_CAP_DR1,

  5865.     .flush          = vc1_sprite_flush,

  5866.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image"),

  5867.     .pix_fmts       = ff_pixfmt_list_420

  5868. };

  5869. #endif

  5870. 

  5871. #if CONFIG_VC1IMAGE_DECODER

  5872. AVCodec ff_vc1image_decoder = {

  5873.     .name           = "vc1image",

  5874.     .type           = AVMEDIA_TYPE_VIDEO,

  5875.     .id             = AV_CODEC_ID_VC1IMAGE,

  5876.     .priv_data_size = sizeof(VC1Context),

  5877.     .init           = vc1_decode_init,

  5878.     .close          = ff_vc1_decode_end,

  5879.     .decode         = vc1_decode_frame,

  5880.     .capabilities   = CODEC_CAP_DR1,

  5881.     .flush          = vc1_sprite_flush,

  5882.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image v2"),

  5883.     .pix_fmts       = ff_pixfmt_list_420

  5884. };

  5885. #endif