falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35359 Commits
32 Branches
1.0GB
Tree: 22f5149ec4
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '22f5149ec4'
${ noResults }
FFmpeg/libavcodec/vc1dec.c

5782 lines
223KB
Raw Blame History 

  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2011 Mashiat Sarker Shakkhar

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

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

  6.  *

  7.  * This file is part of Libav.

  8.  *

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

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

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

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

  13.  *

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

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

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

  17.  * Lesser General Public License for more details.

  18.  *

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

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

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

  22.  */

  23. 

  24. /**

  25.  * @file

  26.  * VC-1 and WMV3 decoder

  27.  */

  28. 

  29. #include "internal.h"

  30. #include "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. 

  42. #undef NDEBUG

  43. #include <assert.h>

  44. 

  45. #define MB_INTRA_VLC_BITS 9

  46. #define DC_VLC_BITS 9

  47. 

  48. 

  49. // offset tables for interlaced picture MVDATA decoding

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

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

  52. 

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

  54. /**

  55.  * @name VC-1 Bitplane decoding

  56.  * @see 8.7, p56

  57.  * @{

  58.  */

  59. 

  60. /**

  61.  * Imode types

  62.  * @{

  63.  */

  64. enum Imode {

  65.     IMODE_RAW,

  66.     IMODE_NORM2,

  67.     IMODE_DIFF2,

  68.     IMODE_NORM6,

  69.     IMODE_DIFF6,

  70.     IMODE_ROWSKIP,

  71.     IMODE_COLSKIP

  72. };

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

  74. 

  75. 

  76. /** @} */ //Bitplane group

  77. 

  78. static void vc1_put_signed_blocks_clamped(VC1Context *v)

  79. {

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

  81.     int topleft_mb_pos, top_mb_pos;

  82.     int stride_y, fieldtx;

  83.     int v_dist;

  84. 

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

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

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

  88.      * present as well.

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

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

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

  92.     if (!s->first_slice_line) {

  93.         if (s->mb_x) {

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

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

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

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

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

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

  100.                                              stride_y);

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

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

  103.                                              stride_y);

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

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

  106.                                              stride_y);

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

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

  109.                                              stride_y);

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

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

  112.                                              s->uvlinesize);

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

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

  115.                                              s->uvlinesize);

  116.         }

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

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

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

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

  121.             v_dist     = fieldtx ? 15 : 8;

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

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

  124.                                              stride_y);

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

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

  127.                                              stride_y);

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

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

  130.                                              stride_y);

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

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

  133.                                              stride_y);

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

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

  136.                                              s->uvlinesize);

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

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

  139.                                              s->uvlinesize);

  140.         }

  141.     }

  142. 

  143. #define inc_blk_idx(idx) do { \

  144.         idx++; \

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

  146.             idx = 0; \

  147.     } while (0)

  148. 

  149.     inc_blk_idx(v->topleft_blk_idx);

  150.     inc_blk_idx(v->top_blk_idx);

  151.     inc_blk_idx(v->left_blk_idx);

  152.     inc_blk_idx(v->cur_blk_idx);

  153. }

  154. 

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

  156. {

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

  158.     int j;

  159.     if (!s->first_slice_line) {

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

  161.         if (s->mb_x)

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

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

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

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

  166.             if (s->mb_x)

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

  168.         }

  169.     }

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

  171. 

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

  173.         if (s->mb_x) {

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

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

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

  177.         }

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

  179.     }

  180. }

  181. 

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

  183. {

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

  185.     int j;

  186. 

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

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

  189.     if (!s->first_slice_line) {

  190.         if (s->mb_x) {

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

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

  193. 

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

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

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

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

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

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

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

  201.                     }

  202.                 }

  203.             }

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

  205.         }

  206. 

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

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

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

  210. 

  211.                 if (s->mb_x)

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

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

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

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

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

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

  218.                     }

  219.                 }

  220.             }

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

  222.         }

  223. 

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

  225.             if (s->mb_x) {

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

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

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

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

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

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

  232.                     }

  233.                 }

  234.             }

  235. 

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

  237.                 if (s->mb_x)

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

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

  240.                 if (s->mb_x) {

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

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

  243.                     }

  244.                 }

  245.             }

  246.         }

  247.     }

  248. }

  249. 

  250. static void vc1_smooth_overlap_filter_iblk(VC1Context *v)

  251. {

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

  253.     int mb_pos;

  254. 

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

  256.         return;

  257. 

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

  259. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  279.             }

  280.         }

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

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

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

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

  285. 

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

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

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

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

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

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

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

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

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

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

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

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

  298.                 }

  299.             }

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

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

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

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

  304.         }

  305.     }

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

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

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

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

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

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

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

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

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

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

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

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

  318.             }

  319.         }

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

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

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

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

  324.     }

  325. }

  326. 

  327. /** Do motion compensation over 1 macroblock

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

  329.  */

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

  331. {

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

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

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

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

  336.     int off, off_uv;

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

  338. 

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

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

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

  342.         return;

  343. 

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

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

  346. 

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

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

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

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

  351.     }

  352. 

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

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

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

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

  357. 

  358.     if (v->field_mode &&

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

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

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

  362.     }

  363. 

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

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

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

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

  368.     }

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

  370.         if (!dir) {

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

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

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

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

  375.             } else {

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

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

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

  379.             }

  380.         } else {

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

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

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

  384.         }

  385.     } else {

  386.         if (!dir) {

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

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

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

  390.         } else {

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

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

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

  394.         }

  395.     }

  396. 

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

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

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

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

  401. 

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

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

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

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

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

  407.     } else {

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

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

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

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

  412.     }

  413. 

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

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

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

  417. 

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

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

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

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

  422.     }

  423. 

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

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

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

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

  428.     }

  429. 

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

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

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

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

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

  435. 

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

  437.         s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize,

  438.                                 17 + s->mspel * 2, 17 + s->mspel * 2,

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

  440.                                 s->h_edge_pos, v_edge_pos);

  441.         srcY = s->edge_emu_buffer;

  442.         s->dsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8 + 1, 8 + 1,

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

  444.         s->dsp.emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8 + 1, 8 + 1,

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

  446.         srcU = uvbuf;

  447.         srcV = uvbuf + 16;

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

  449.         if (v->rangeredfrm) {

  450.             int i, j;

  451.             uint8_t *src, *src2;

  452. 

  453.             src = srcY;

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

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

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

  457.                 src += s->linesize;

  458.             }

  459.             src  = srcU;

  460.             src2 = srcV;

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

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

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

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

  465.                 }

  466.                 src  += s->uvlinesize;

  467.                 src2 += s->uvlinesize;

  468.             }

  469.         }

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

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

  472.             int i, j;

  473.             uint8_t *src, *src2;

  474. 

  475.             src = srcY;

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

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

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

  479.                 src += s->linesize;

  480.             }

  481.             src  = srcU;

  482.             src2 = srcV;

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

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

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

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

  487.                 }

  488.                 src  += s->uvlinesize;

  489.                 src2 += s->uvlinesize;

  490.             }

  491.         }

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

  493.     }

  494. 

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

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

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

  498.     } else {

  499.         off    = 0;

  500.         off_uv = 0;

  501.     }

  502.     if (s->mspel) {

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

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

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

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

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

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

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

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

  511.         if (!v->rnd)

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

  513.         else

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

  515.     }

  516. 

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

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

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

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

  521.     if (!v->rnd) {

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

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

  524.     } else {

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

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

  527.     }

  528. }

  529. 

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

  531. {

  532.     if (a < b) {

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

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

  535.     } else {

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

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

  538.     }

  539. }

  540. 

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

  542.  */

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

  544. {

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

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

  547.     uint8_t *srcY;

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

  549.     int off;

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

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

  552. 

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

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

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

  556.         return;

  557. 

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

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

  560. 

  561.     if (!dir) {

  562.         if (v->field_mode) {

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

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

  565.             else

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

  567.         } else

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

  569.     } else

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

  571. 

  572.     if (v->field_mode) {

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

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

  575.     }

  576. 

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

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

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

  580.         int tx, ty;

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

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

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

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

  585.             opp_count  += f;

  586.             same_count += 1 - f;

  587.         }

  588.         f = opp_count > same_count;

  589.         switch (f ? opp_count : same_count) {

  590.         case 4:

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

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

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

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

  595.             break;

  596.         case 3:

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

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

  599.             break;

  600.         case 2:

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

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

  603.             break;

  604.         }

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

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

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

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

  609.     }

  610. 

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

  612.         int qx, qy;

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

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

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

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

  617. 

  618.         if (qx < -17)

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

  620.         else if (qx > width)

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

  622.         if (qy < -18)

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

  624.         else if (qy > height + 1)

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

  626.     }

  627. 

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

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

  630.     else

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

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

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

  634. 

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

  636.     if (!fieldmv)

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

  638.     else

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

  640. 

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

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

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

  644.     } else {

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

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

  647.             if (src_y & 1)

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

  649.             else

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

  651.         } else {

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

  653.         }

  654.     }

  655. 

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

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

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

  659. 

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

  661.         v_edge_pos--;

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

  663.         src_y--;

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

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

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

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

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

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

  670.         s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize,

  671.                                 9 + s->mspel * 2, (9 + s->mspel * 2) << fieldmv,

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

  673.                                 s->h_edge_pos, v_edge_pos);

  674.         srcY = s->edge_emu_buffer;

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

  676.         if (v->rangeredfrm) {

  677.             int i, j;

  678.             uint8_t *src;

  679. 

  680.             src = srcY;

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

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

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

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

  685.             }

  686.         }

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

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

  689.             int i, j;

  690.             uint8_t *src;

  691. 

  692.             src = srcY;

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

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

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

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

  697.             }

  698.         }

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

  700.     }

  701. 

  702.     if (s->mspel) {

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

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

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

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

  707.         if (!v->rnd)

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

  709.         else

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

  711.     }

  712. }

  713. 

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

  715. {

  716.     int idx, i;

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

  718. 

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

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

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

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

  723.     if (!idx) {

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

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

  726.         return 4;

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

  728.         switch (idx) {

  729.         case 0x1:

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

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

  732.             return 3;

  733.         case 0x2:

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

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

  736.             return 3;

  737.         case 0x4:

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

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

  740.             return 3;

  741.         case 0x8:

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

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

  744.             return 3;

  745.         }

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

  747.         int t1 = 0, t2 = 0;

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

  749.             if (!a[i]) {

  750.                 t1 = i;

  751.                 break;

  752.             }

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

  754.             if (!a[i]) {

  755.                 t2 = i;

  756.                 break;

  757.             }

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

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

  760.         return 2;

  761.     } else {

  762.         return 0;

  763.     }

  764.     return -1;

  765. }

  766. 

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

  768.  */

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

  770. {

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

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

  773.     uint8_t *srcU, *srcV;

  774.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

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

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

  777.     int valid_count;

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

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

  780. 

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

  782.         return;

  783.     if (s->flags & CODEC_FLAG_GRAY)

  784.         return;

  785. 

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

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

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

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

  790.         if (v->field_mode)

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

  792.     }

  793. 

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

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

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

  797.         chroma_ref_type = v->reffield;

  798.         if (!valid_count) {

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

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

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

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

  803.         }

  804.     } else {

  805.         int dominant = 0;

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

  807.             dominant = 1;

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

  809.         if (dominant)

  810.             chroma_ref_type = !v->cur_field_type;

  811.     }

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

  813.         return;

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

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

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

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

  818. 

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

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

  821. 

  822.     if (v->fastuvmc) {

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

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

  825.     }

  826.     // Field conversion bias

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

  828.         uvmy += 2 - 4 * chroma_ref_type;

  829. 

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

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

  832. 

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

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

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

  836.     } else {

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

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

  839.     }

  840. 

  841.     if (!dir) {

  842.         if (v->field_mode) {

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

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

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

  846.             } else {

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

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

  849.             }

  850.         } else {

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

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

  853.         }

  854.     } else {

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

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

  857.     }

  858. 

  859.     if (v->field_mode) {

  860.         if (chroma_ref_type) {

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

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

  863.         }

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

  865.     }

  866. 

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

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

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

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

  871.         s->dsp.emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize,

  872.                                 8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

  874.         s->dsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize,

  875.                                 8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

  877.         srcU = s->edge_emu_buffer;

  878.         srcV = s->edge_emu_buffer + 16;

  879. 

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

  881.         if (v->rangeredfrm) {

  882.             int i, j;

  883.             uint8_t *src, *src2;

  884. 

  885.             src  = srcU;

  886.             src2 = srcV;

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

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

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

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

  891.                 }

  892.                 src  += s->uvlinesize;

  893.                 src2 += s->uvlinesize;

  894.             }

  895.         }

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

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

  898.             int i, j;

  899.             uint8_t *src, *src2;

  900. 

  901.             src  = srcU;

  902.             src2 = srcV;

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

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

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

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

  907.                 }

  908.                 src  += s->uvlinesize;

  909.                 src2 += s->uvlinesize;

  910.             }

  911.         }

  912.     }

  913. 

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

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

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

  917.     if (!v->rnd) {

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

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

  920.     } else {

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

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

  923.     }

  924. }

  925. 

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

  927.  */

  928. static void vc1_mc_4mv_chroma4(VC1Context *v)

  929. {

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

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

  932.     uint8_t *srcU, *srcV;

  933.     int uvsrc_x, uvsrc_y;

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

  935.     int i, off, tx, ty;

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

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

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

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

  940. 

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

  942.         return;

  943.     if (s->flags & CODEC_FLAG_GRAY)

  944.         return;

  945. 

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

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

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

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

  950.         if (fieldmv)

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

  952.         else

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

  954.     }

  955. 

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

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

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

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

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

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

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

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

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

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

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

  967. 

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

  969.             v_edge_pos--;

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

  971.             uvsrc_y--;

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

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

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

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

  976.             s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcU, s->uvlinesize,

  977.                                     5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

  979.             s->dsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize,

  980.                                     5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

  982.             srcU = s->edge_emu_buffer;

  983.             srcV = s->edge_emu_buffer + 16;

  984. 

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

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

  987.                 int i, j;

  988.                 uint8_t *src, *src2;

  989. 

  990.                 src  = srcU;

  991.                 src2 = srcV;

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

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

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

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

  996.                     }

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

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

  999.                 }

  1000.             }

  1001.         }

  1002.         if (!v->rnd) {

  1003.             dsp->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1004.             dsp->put_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  1005.         } else {

  1006.             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]);

  1007.             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]);

  1008.         }

  1009.     }

  1010. }

  1011. 

  1012. /***********************************************************************/

  1013. /**

  1014.  * @name VC-1 Block-level functions

  1015.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1016.  * @{

  1017.  */

  1018. 

  1019. /**

  1020.  * @def GET_MQUANT

  1021.  * @brief Get macroblock-level quantizer scale

  1022.  */

  1023. #define GET_MQUANT()                                           \

  1024.     if (v->dquantfrm) {                                        \

  1025.         int edges = 0;                                         \

  1026.         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \

  1027.             if (v->dqbilevel) {                                \

  1028.                 mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \

  1029.             } else {                                           \

  1030.                 mqdiff = get_bits(gb, 3);                      \

  1031.                 if (mqdiff != 7)                               \

  1032.                     mquant = v->pq + mqdiff;                   \

  1033.                 else                                           \

  1034.                     mquant = get_bits(gb, 5);                  \

  1035.             }                                                  \

  1036.         }                                                      \

  1037.         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \

  1038.             edges = 1 << v->dqsbedge;                          \

  1039.         else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \

  1040.             edges = (3 << v->dqsbedge) % 15;                   \

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

  1042.             edges = 15;                                        \

  1043.         if ((edges&1) && !s->mb_x)                             \

  1044.             mquant = v->altpq;                                 \

  1045.         if ((edges&2) && s->first_slice_line)                  \

  1046.             mquant = v->altpq;                                 \

  1047.         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \

  1048.             mquant = v->altpq;                                 \

  1049.         if ((edges&8) && s->mb_y == (s->mb_height - 1))        \

  1050.             mquant = v->altpq;                                 \

  1051.         if (!mquant || mquant > 31) {                          \

  1052.             av_log(v->s.avctx, AV_LOG_ERROR,                   \

  1053.                    "Overriding invalid mquant %d\n", mquant);  \

  1054.             mquant = 1;                                        \

  1055.         }                                                      \

  1056.     }

  1057. 

  1058. /**

  1059.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1060.  * @brief Get MV differentials

  1061.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1062.  * @param _dmv_x Horizontal differential for decoded MV

  1063.  * @param _dmv_y Vertical differential for decoded MV

  1064.  */

  1065. #define GET_MVDATA(_dmv_x, _dmv_y)                                      \

  1066.     index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \

  1067.                          VC1_MV_DIFF_VLC_BITS, 2);                      \

  1068.     if (index > 36) {                                                   \

  1069.         mb_has_coeffs = 1;                                              \

  1070.         index -= 37;                                                    \

  1071.     } else                                                              \

  1072.         mb_has_coeffs = 0;                                              \

  1073.     s->mb_intra = 0;                                                    \

  1074.     if (!index) {                                                       \

  1075.         _dmv_x = _dmv_y = 0;                                            \

  1076.     } else if (index == 35) {                                           \

  1077.         _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1078.         _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1079.     } else if (index == 36) {                                           \

  1080.         _dmv_x = 0;                                                     \

  1081.         _dmv_y = 0;                                                     \

  1082.         s->mb_intra = 1;                                                \

  1083.     } else {                                                            \

  1084.         index1 = index % 6;                                             \

  1085.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1086.         else                                   val = 0;                 \

  1087.         if (size_table[index1] - val > 0)                               \

  1088.             val = get_bits(gb, size_table[index1] - val);               \

  1089.         else                                   val = 0;                 \

  1090.         sign = 0 - (val&1);                                             \

  1091.         _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1092.                                                                         \

  1093.         index1 = index / 6;                                             \

  1094.         if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1095.         else                                   val = 0;                 \

  1096.         if (size_table[index1] - val > 0)                               \

  1097.             val = get_bits(gb, size_table[index1] - val);               \

  1098.         else                                   val = 0;                 \

  1099.         sign = 0 - (val & 1);                                           \

  1100.         _dmv_y = (sign ^ ((val >> 1) + offset_table[index1])) - sign;   \

  1101.     }

  1102. 

  1103. static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,

  1104.                                                    int *dmv_y, int *pred_flag)

  1105. {

  1106.     int index, index1;

  1107.     int extend_x = 0, extend_y = 0;

  1108.     GetBitContext *gb = &v->s.gb;

  1109.     int bits, esc;

  1110.     int val, sign;

  1111.     const int* offs_tab;

  1112. 

  1113.     if (v->numref) {

  1114.         bits = VC1_2REF_MVDATA_VLC_BITS;

  1115.         esc  = 125;

  1116.     } else {

  1117.         bits = VC1_1REF_MVDATA_VLC_BITS;

  1118.         esc  = 71;

  1119.     }

  1120.     switch (v->dmvrange) {

  1121.     case 1:

  1122.         extend_x = 1;

  1123.         break;

  1124.     case 2:

  1125.         extend_y = 1;

  1126.         break;

  1127.     case 3:

  1128.         extend_x = extend_y = 1;

  1129.         break;

  1130.     }

  1131.     index = get_vlc2(gb, v->imv_vlc->table, bits, 3);

  1132.     if (index == esc) {

  1133.         *dmv_x = get_bits(gb, v->k_x);

  1134.         *dmv_y = get_bits(gb, v->k_y);

  1135.         if (v->numref) {

  1136.             *pred_flag = *dmv_y & 1;

  1137.             *dmv_y     = (*dmv_y + *pred_flag) >> 1;

  1138.         }

  1139.     }

  1140.     else {

  1141.         if (extend_x)

  1142.             offs_tab = offset_table2;

  1143.         else

  1144.             offs_tab = offset_table1;

  1145.         index1 = (index + 1) % 9;

  1146.         if (index1 != 0) {

  1147.             val    = get_bits(gb, index1 + extend_x);

  1148.             sign   = 0 -(val & 1);

  1149.             *dmv_x = (sign ^ ((val >> 1) + offs_tab[index1])) - sign;

  1150.         } else

  1151.             *dmv_x = 0;

  1152.         if (extend_y)

  1153.             offs_tab = offset_table2;

  1154.         else

  1155.             offs_tab = offset_table1;

  1156.         index1 = (index + 1) / 9;

  1157.         if (index1 > v->numref) {

  1158.             val    = get_bits(gb, (index1 + (extend_y << v->numref)) >> v->numref);

  1159.             sign   = 0 - (val & 1);

  1160.             *dmv_y = (sign ^ ((val >> 1) + offs_tab[index1 >> v->numref])) - sign;

  1161.         } else

  1162.             *dmv_y = 0;

  1163.         if (v->numref)

  1164.             *pred_flag = index1 & 1;

  1165.     }

  1166. }

  1167. 

  1168. static av_always_inline int scaleforsame_x(VC1Context *v, int n /* MV */, int dir)

  1169. {

  1170.     int scaledvalue, refdist;

  1171.     int scalesame1, scalesame2;

  1172.     int scalezone1_x, zone1offset_x;

  1173.     int table_index = dir ^ v->second_field;

  1174. 

  1175.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1176.         refdist = v->refdist;

  1177.     else

  1178.         refdist = dir ? v->brfd : v->frfd;

  1179.     if (refdist > 3)

  1180.         refdist = 3;

  1181.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1182.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1183.     scalezone1_x  = ff_vc1_field_mvpred_scales[table_index][3][refdist];

  1184.     zone1offset_x = ff_vc1_field_mvpred_scales[table_index][5][refdist];

  1185. 

  1186.     if (FFABS(n) > 255)

  1187.         scaledvalue = n;

  1188.     else {

  1189.         if (FFABS(n) < scalezone1_x)

  1190.             scaledvalue = (n * scalesame1) >> 8;

  1191.         else {

  1192.             if (n < 0)

  1193.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_x;

  1194.             else

  1195.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_x;

  1196.         }

  1197.     }

  1198.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1199. }

  1200. 

  1201. static av_always_inline int scaleforsame_y(VC1Context *v, int i, int n /* MV */, int dir)

  1202. {

  1203.     int scaledvalue, refdist;

  1204.     int scalesame1, scalesame2;

  1205.     int scalezone1_y, zone1offset_y;

  1206.     int table_index = dir ^ v->second_field;

  1207. 

  1208.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1209.         refdist = v->refdist;

  1210.     else

  1211.         refdist = dir ? v->brfd : v->frfd;

  1212.     if (refdist > 3)

  1213.         refdist = 3;

  1214.     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];

  1215.     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];

  1216.     scalezone1_y  = ff_vc1_field_mvpred_scales[table_index][4][refdist];

  1217.     zone1offset_y = ff_vc1_field_mvpred_scales[table_index][6][refdist];

  1218. 

  1219.     if (FFABS(n) > 63)

  1220.         scaledvalue = n;

  1221.     else {

  1222.         if (FFABS(n) < scalezone1_y)

  1223.             scaledvalue = (n * scalesame1) >> 8;

  1224.         else {

  1225.             if (n < 0)

  1226.                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_y;

  1227.             else

  1228.                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_y;

  1229.         }

  1230.     }

  1231. 

  1232.     if (v->cur_field_type && !v->ref_field_type[dir])

  1233.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1234.     else

  1235.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1236. }

  1237. 

  1238. static av_always_inline int scaleforopp_x(VC1Context *v, int n /* MV */)

  1239. {

  1240.     int scalezone1_x, zone1offset_x;

  1241.     int scaleopp1, scaleopp2, brfd;

  1242.     int scaledvalue;

  1243. 

  1244.     brfd = FFMIN(v->brfd, 3);

  1245.     scalezone1_x  = ff_vc1_b_field_mvpred_scales[3][brfd];

  1246.     zone1offset_x = ff_vc1_b_field_mvpred_scales[5][brfd];

  1247.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1248.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1249. 

  1250.     if (FFABS(n) > 255)

  1251.         scaledvalue = n;

  1252.     else {

  1253.         if (FFABS(n) < scalezone1_x)

  1254.             scaledvalue = (n * scaleopp1) >> 8;

  1255.         else {

  1256.             if (n < 0)

  1257.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_x;

  1258.             else

  1259.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_x;

  1260.         }

  1261.     }

  1262.     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);

  1263. }

  1264. 

  1265. static av_always_inline int scaleforopp_y(VC1Context *v, int n /* MV */, int dir)

  1266. {

  1267.     int scalezone1_y, zone1offset_y;

  1268.     int scaleopp1, scaleopp2, brfd;

  1269.     int scaledvalue;

  1270. 

  1271.     brfd = FFMIN(v->brfd, 3);

  1272.     scalezone1_y  = ff_vc1_b_field_mvpred_scales[4][brfd];

  1273.     zone1offset_y = ff_vc1_b_field_mvpred_scales[6][brfd];

  1274.     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];

  1275.     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

  1276. 

  1277.     if (FFABS(n) > 63)

  1278.         scaledvalue = n;

  1279.     else {

  1280.         if (FFABS(n) < scalezone1_y)

  1281.             scaledvalue = (n * scaleopp1) >> 8;

  1282.         else {

  1283.             if (n < 0)

  1284.                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_y;

  1285.             else

  1286.                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_y;

  1287.         }

  1288.     }

  1289.     if (v->cur_field_type && !v->ref_field_type[dir]) {

  1290.         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);

  1291.     } else {

  1292.         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);

  1293.     }

  1294. }

  1295. 

  1296. static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */,

  1297.                                          int dim, int dir)

  1298. {

  1299.     int brfd, scalesame;

  1300.     int hpel = 1 - v->s.quarter_sample;

  1301. 

  1302.     n >>= hpel;

  1303.     if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {

  1304.         if (dim)

  1305.             n = scaleforsame_y(v, i, n, dir) << hpel;

  1306.         else

  1307.             n = scaleforsame_x(v, n, dir) << hpel;

  1308.         return n;

  1309.     }

  1310.     brfd      = FFMIN(v->brfd, 3);

  1311.     scalesame = ff_vc1_b_field_mvpred_scales[0][brfd];

  1312. 

  1313.     n = (n * scalesame >> 8) << hpel;

  1314.     return n;

  1315. }

  1316. 

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

  1318.                                         int dim, int dir)

  1319. {

  1320.     int refdist, scaleopp;

  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 == 1) {

  1325.         if (dim)

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

  1327.         else

  1328.             n = scaleforopp_x(v, n) << hpel;

  1329.         return n;

  1330.     }

  1331.     if (v->s.pict_type != AV_PICTURE_TYPE_B)

  1332.         refdist = FFMIN(v->refdist, 3);

  1333.     else

  1334.         refdist = dir ? v->brfd : v->frfd;

  1335.     scaleopp = ff_vc1_field_mvpred_scales[dir ^ v->second_field][0][refdist];

  1336. 

  1337.     n = (n * scaleopp >> 8) << hpel;

  1338.     return n;

  1339. }

  1340. 

  1341. /** Predict and set motion vector

  1342.  */

  1343. static inline void vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,

  1344.                                int mv1, int r_x, int r_y, uint8_t* is_intra,

  1345.                                int pred_flag, int dir)

  1346. {

  1347.     MpegEncContext *s = &v->s;

  1348.     int xy, wrap, off = 0;

  1349.     int16_t *A, *B, *C;

  1350.     int px, py;

  1351.     int sum;

  1352.     int mixedmv_pic, num_samefield = 0, num_oppfield = 0;

  1353.     int opposite, a_f, b_f, c_f;

  1354.     int16_t field_predA[2];

  1355.     int16_t field_predB[2];

  1356.     int16_t field_predC[2];

  1357.     int a_valid, b_valid, c_valid;

  1358.     int hybridmv_thresh, y_bias = 0;

  1359. 

  1360.     if (v->mv_mode == MV_PMODE_MIXED_MV ||

  1361.         ((v->mv_mode == MV_PMODE_INTENSITY_COMP) && (v->mv_mode2 == MV_PMODE_MIXED_MV)))

  1362.         mixedmv_pic = 1;

  1363.     else

  1364.         mixedmv_pic = 0;

  1365.     /* scale MV difference to be quad-pel */

  1366.     dmv_x <<= 1 - s->quarter_sample;

  1367.     dmv_y <<= 1 - s->quarter_sample;

  1368. 

  1369.     wrap = s->b8_stride;

  1370.     xy   = s->block_index[n];

  1371. 

  1372.     if (s->mb_intra) {

  1373.         s->mv[0][n][0] = s->current_picture.f.motion_val[0][xy + v->blocks_off][0] = 0;

  1374.         s->mv[0][n][1] = s->current_picture.f.motion_val[0][xy + v->blocks_off][1] = 0;

  1375.         s->current_picture.f.motion_val[1][xy + v->blocks_off][0] = 0;

  1376.         s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = 0;

  1377.         if (mv1) { /* duplicate motion data for 1-MV block */

  1378.             s->current_picture.f.motion_val[0][xy + 1 + v->blocks_off][0]        = 0;

  1379.             s->current_picture.f.motion_val[0][xy + 1 + v->blocks_off][1]        = 0;

  1380.             s->current_picture.f.motion_val[0][xy + wrap + v->blocks_off][0]     = 0;

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

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

  1383.             s->current_picture.f.motion_val[0][xy + wrap + 1 + v->blocks_off][1] = 0;

  1384.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

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

  1386.             s->current_picture.f.motion_val[1][xy + 1 + v->blocks_off][1]        = 0;

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

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

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

  1390.             s->current_picture.f.motion_val[1][xy + wrap + 1 + v->blocks_off][1] = 0;

  1391.         }

  1392.         return;

  1393.     }

  1394. 

  1395.     C = s->current_picture.f.motion_val[dir][xy -    1 + v->blocks_off];

  1396.     A = s->current_picture.f.motion_val[dir][xy - wrap + v->blocks_off];

  1397.     if (mv1) {

  1398.         if (v->field_mode && mixedmv_pic)

  1399.             off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1400.         else

  1401.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1402.     } else {

  1403.         //in 4-MV mode different blocks have different B predictor position

  1404.         switch (n) {

  1405.         case 0:

  1406.             off = (s->mb_x > 0) ? -1 : 1;

  1407.             break;

  1408.         case 1:

  1409.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1410.             break;

  1411.         case 2:

  1412.             off = 1;

  1413.             break;

  1414.         case 3:

  1415.             off = -1;

  1416.         }

  1417.     }

  1418.     B = s->current_picture.f.motion_val[dir][xy - wrap + off + v->blocks_off];

  1419. 

  1420.     a_valid = !s->first_slice_line || (n == 2 || n == 3);

  1421.     b_valid = a_valid && (s->mb_width > 1);

  1422.     c_valid = s->mb_x || (n == 1 || n == 3);

  1423.     if (v->field_mode) {

  1424.         a_valid = a_valid && !is_intra[xy - wrap];

  1425.         b_valid = b_valid && !is_intra[xy - wrap + off];

  1426.         c_valid = c_valid && !is_intra[xy - 1];

  1427.     }

  1428. 

  1429.     if (a_valid) {

  1430.         a_f = v->mv_f[dir][xy - wrap + v->blocks_off];

  1431.         num_oppfield  += a_f;

  1432.         num_samefield += 1 - a_f;

  1433.         field_predA[0] = A[0];

  1434.         field_predA[1] = A[1];

  1435.     } else {

  1436.         field_predA[0] = field_predA[1] = 0;

  1437.         a_f = 0;

  1438.     }

  1439.     if (b_valid) {

  1440.         b_f = v->mv_f[dir][xy - wrap + off + v->blocks_off];

  1441.         num_oppfield  += b_f;

  1442.         num_samefield += 1 - b_f;

  1443.         field_predB[0] = B[0];

  1444.         field_predB[1] = B[1];

  1445.     } else {

  1446.         field_predB[0] = field_predB[1] = 0;

  1447.         b_f = 0;

  1448.     }

  1449.     if (c_valid) {

  1450.         c_f = v->mv_f[dir][xy - 1 + v->blocks_off];

  1451.         num_oppfield  += c_f;

  1452.         num_samefield += 1 - c_f;

  1453.         field_predC[0] = C[0];

  1454.         field_predC[1] = C[1];

  1455.     } else {

  1456.         field_predC[0] = field_predC[1] = 0;

  1457.         c_f = 0;

  1458.     }

  1459. 

  1460.     if (v->field_mode) {

  1461.         if (!v->numref)

  1462.             // REFFIELD determines if the last field or the second-last field is

  1463.             // to be used as reference

  1464.             opposite = 1 - v->reffield;

  1465.         else {

  1466.             if (num_samefield <= num_oppfield)

  1467.                 opposite = 1 - pred_flag;

  1468.             else

  1469.                 opposite = pred_flag;

  1470.         }

  1471.     } else

  1472.         opposite = 0;

  1473.     if (opposite) {

  1474.         if (a_valid && !a_f) {

  1475.             field_predA[0] = scaleforopp(v, field_predA[0], 0, dir);

  1476.             field_predA[1] = scaleforopp(v, field_predA[1], 1, dir);

  1477.         }

  1478.         if (b_valid && !b_f) {

  1479.             field_predB[0] = scaleforopp(v, field_predB[0], 0, dir);

  1480.             field_predB[1] = scaleforopp(v, field_predB[1], 1, dir);

  1481.         }

  1482.         if (c_valid && !c_f) {

  1483.             field_predC[0] = scaleforopp(v, field_predC[0], 0, dir);

  1484.             field_predC[1] = scaleforopp(v, field_predC[1], 1, dir);

  1485.         }

  1486.         v->mv_f[dir][xy + v->blocks_off] = 1;

  1487.         v->ref_field_type[dir] = !v->cur_field_type;

  1488.     } else {

  1489.         if (a_valid && a_f) {

  1490.             field_predA[0] = scaleforsame(v, n, field_predA[0], 0, dir);

  1491.             field_predA[1] = scaleforsame(v, n, field_predA[1], 1, dir);

  1492.         }

  1493.         if (b_valid && b_f) {

  1494.             field_predB[0] = scaleforsame(v, n, field_predB[0], 0, dir);

  1495.             field_predB[1] = scaleforsame(v, n, field_predB[1], 1, dir);

  1496.         }

  1497.         if (c_valid && c_f) {

  1498.             field_predC[0] = scaleforsame(v, n, field_predC[0], 0, dir);

  1499.             field_predC[1] = scaleforsame(v, n, field_predC[1], 1, dir);

  1500.         }

  1501.         v->mv_f[dir][xy + v->blocks_off] = 0;

  1502.         v->ref_field_type[dir] = v->cur_field_type;

  1503.     }

  1504. 

  1505.     if (a_valid) {

  1506.         px = field_predA[0];

  1507.         py = field_predA[1];

  1508.     } else if (c_valid) {

  1509.         px = field_predC[0];

  1510.         py = field_predC[1];

  1511.     } else if (b_valid) {

  1512.         px = field_predB[0];

  1513.         py = field_predB[1];

  1514.     } else {

  1515.         px = 0;

  1516.         py = 0;

  1517.     }

  1518. 

  1519.     if (num_samefield + num_oppfield > 1) {

  1520.         px = mid_pred(field_predA[0], field_predB[0], field_predC[0]);

  1521.         py = mid_pred(field_predA[1], field_predB[1], field_predC[1]);

  1522.     }

  1523. 

  1524.     /* Pullback MV as specified in 8.3.5.3.4 */

  1525.     if (!v->field_mode) {

  1526.         int qx, qy, X, Y;

  1527.         qx = (s->mb_x << 6) + ((n == 1 || n == 3) ? 32 : 0);

  1528.         qy = (s->mb_y << 6) + ((n == 2 || n == 3) ? 32 : 0);

  1529.         X  = (s->mb_width  << 6) - 4;

  1530.         Y  = (s->mb_height << 6) - 4;

  1531.         if (mv1) {

  1532.             if (qx + px < -60) px = -60 - qx;

  1533.             if (qy + py < -60) py = -60 - qy;

  1534.         } else {

  1535.             if (qx + px < -28) px = -28 - qx;

  1536.             if (qy + py < -28) py = -28 - qy;

  1537.         }

  1538.         if (qx + px > X) px = X - qx;

  1539.         if (qy + py > Y) py = Y - qy;

  1540.     }

  1541. 

  1542.     if (!v->field_mode || s->pict_type != AV_PICTURE_TYPE_B) {

  1543.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 (also 10.3.5.4.3.5) */

  1544.         hybridmv_thresh = 32;

  1545.         if (a_valid && c_valid) {

  1546.             if (is_intra[xy - wrap])

  1547.                 sum = FFABS(px) + FFABS(py);

  1548.             else

  1549.                 sum = FFABS(px - field_predA[0]) + FFABS(py - field_predA[1]);

  1550.             if (sum > hybridmv_thresh) {

  1551.                 if (get_bits1(&s->gb)) {     // read HYBRIDPRED bit

  1552.                     px = field_predA[0];

  1553.                     py = field_predA[1];

  1554.                 } else {

  1555.                     px = field_predC[0];

  1556.                     py = field_predC[1];

  1557.                 }

  1558.             } else {

  1559.                 if (is_intra[xy - 1])

  1560.                     sum = FFABS(px) + FFABS(py);

  1561.                 else

  1562.                     sum = FFABS(px - field_predC[0]) + FFABS(py - field_predC[1]);

  1563.                 if (sum > hybridmv_thresh) {

  1564.                     if (get_bits1(&s->gb)) {

  1565.                         px = field_predA[0];

  1566.                         py = field_predA[1];

  1567.                     } else {

  1568.                         px = field_predC[0];

  1569.                         py = field_predC[1];

  1570.                     }

  1571.                 }

  1572.             }

  1573.         }

  1574.     }

  1575. 

  1576.     if (v->field_mode && v->numref)

  1577.         r_y >>= 1;

  1578.     if (v->field_mode && v->cur_field_type && v->ref_field_type[dir] == 0)

  1579.         y_bias = 1;

  1580.     /* store MV using signed modulus of MV range defined in 4.11 */

  1581.     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;

  1582.     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;

  1583.     if (mv1) { /* duplicate motion data for 1-MV block */

  1584.         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];

  1585.         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];

  1586.         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];

  1587.         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];

  1588.         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];

  1589.         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];

  1590.         v->mv_f[dir][xy +    1 + v->blocks_off] = v->mv_f[dir][xy +            v->blocks_off];

  1591.         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];

  1592.     }

  1593. }

  1594. 

  1595. /** Predict and set motion vector for interlaced frame picture MBs

  1596.  */

  1597. static inline void vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,

  1598.                                      int mvn, int r_x, int r_y, uint8_t* is_intra)

  1599. {

  1600.     MpegEncContext *s = &v->s;

  1601.     int xy, wrap, off = 0;

  1602.     int A[2], B[2], C[2];

  1603.     int px, py;

  1604.     int a_valid = 0, b_valid = 0, c_valid = 0;

  1605.     int field_a, field_b, field_c; // 0: same, 1: opposit

  1606.     int total_valid, num_samefield, num_oppfield;

  1607.     int pos_c, pos_b, n_adj;

  1608. 

  1609.     wrap = s->b8_stride;

  1610.     xy = s->block_index[n];

  1611. 

  1612.     if (s->mb_intra) {

  1613.         s->mv[0][n][0] = s->current_picture.f.motion_val[0][xy][0] = 0;

  1614.         s->mv[0][n][1] = s->current_picture.f.motion_val[0][xy][1] = 0;

  1615.         s->current_picture.f.motion_val[1][xy][0] = 0;

  1616.         s->current_picture.f.motion_val[1][xy][1] = 0;

  1617.         if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1618.             s->current_picture.f.motion_val[0][xy + 1][0]        = 0;

  1619.             s->current_picture.f.motion_val[0][xy + 1][1]        = 0;

  1620.             s->current_picture.f.motion_val[0][xy + wrap][0]     = 0;

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

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

  1623.             s->current_picture.f.motion_val[0][xy + wrap + 1][1] = 0;

  1624.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

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

  1626.             s->current_picture.f.motion_val[1][xy + 1][1]        = 0;

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

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

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

  1630.             s->current_picture.f.motion_val[1][xy + wrap + 1][1] = 0;

  1631.         }

  1632.         return;

  1633.     }

  1634. 

  1635.     off = ((n == 0) || (n == 1)) ? 1 : -1;

  1636.     /* predict A */

  1637.     if (s->mb_x || (n == 1) || (n == 3)) {

  1638.         if ((v->blk_mv_type[xy]) // current block (MB) has a field MV

  1639.             || (!v->blk_mv_type[xy] && !v->blk_mv_type[xy - 1])) { // or both have frame MV

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

  1641.             A[1] = s->current_picture.f.motion_val[0][xy - 1][1];

  1642.             a_valid = 1;

  1643.         } else { // current block has frame mv and cand. has field MV (so average)

  1644.             A[0] = (s->current_picture.f.motion_val[0][xy - 1][0]

  1645.                     + s->current_picture.f.motion_val[0][xy - 1 + off * wrap][0] + 1) >> 1;

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

  1647.                     + s->current_picture.f.motion_val[0][xy - 1 + off * wrap][1] + 1) >> 1;

  1648.             a_valid = 1;

  1649.         }

  1650.         if (!(n & 1) && v->is_intra[s->mb_x - 1]) {

  1651.             a_valid = 0;

  1652.             A[0] = A[1] = 0;

  1653.         }

  1654.     } else

  1655.         A[0] = A[1] = 0;

  1656.     /* Predict B and C */

  1657.     B[0] = B[1] = C[0] = C[1] = 0;

  1658.     if (n == 0 || n == 1 || v->blk_mv_type[xy]) {

  1659.         if (!s->first_slice_line) {

  1660.             if (!v->is_intra[s->mb_x - s->mb_stride]) {

  1661.                 b_valid = 1;

  1662.                 n_adj   = n | 2;

  1663.                 pos_b   = s->block_index[n_adj] - 2 * wrap;

  1664.                 if (v->blk_mv_type[pos_b] && v->blk_mv_type[xy]) {

  1665.                     n_adj = (n & 2) | (n & 1);

  1666.                 }

  1667.                 B[0] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap][0];

  1668.                 B[1] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap][1];

  1669.                 if (v->blk_mv_type[pos_b] && !v->blk_mv_type[xy]) {

  1670.                     B[0] = (B[0] + s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap][0] + 1) >> 1;

  1671.                     B[1] = (B[1] + s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap][1] + 1) >> 1;

  1672.                 }

  1673.             }

  1674.             if (s->mb_width > 1) {

  1675.                 if (!v->is_intra[s->mb_x - s->mb_stride + 1]) {

  1676.                     c_valid = 1;

  1677.                     n_adj   = 2;

  1678.                     pos_c   = s->block_index[2] - 2 * wrap + 2;

  1679.                     if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1680.                         n_adj = n & 2;

  1681.                     }

  1682.                     C[0] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap + 2][0];

  1683.                     C[1] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap + 2][1];

  1684.                     if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1685.                         C[0] = (1 + C[0] + (s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap + 2][0])) >> 1;

  1686.                         C[1] = (1 + C[1] + (s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap + 2][1])) >> 1;

  1687.                     }

  1688.                     if (s->mb_x == s->mb_width - 1) {

  1689.                         if (!v->is_intra[s->mb_x - s->mb_stride - 1]) {

  1690.                             c_valid = 1;

  1691.                             n_adj   = 3;

  1692.                             pos_c   = s->block_index[3] - 2 * wrap - 2;

  1693.                             if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {

  1694.                                 n_adj = n | 1;

  1695.                             }

  1696.                             C[0] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap - 2][0];

  1697.                             C[1] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap - 2][1];

  1698.                             if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

  1699.                                 C[0] = (1 + C[0] + s->current_picture.f.motion_val[0][s->block_index[1] - 2 * wrap - 2][0]) >> 1;

  1700.                                 C[1] = (1 + C[1] + s->current_picture.f.motion_val[0][s->block_index[1] - 2 * wrap - 2][1]) >> 1;

  1701.                             }

  1702.                         } else

  1703.                             c_valid = 0;

  1704.                     }

  1705.                 }

  1706.             }

  1707.         }

  1708.     } else {

  1709.         pos_b   = s->block_index[1];

  1710.         b_valid = 1;

  1711.         B[0]    = s->current_picture.f.motion_val[0][pos_b][0];

  1712.         B[1]    = s->current_picture.f.motion_val[0][pos_b][1];

  1713.         pos_c   = s->block_index[0];

  1714.         c_valid = 1;

  1715.         C[0]    = s->current_picture.f.motion_val[0][pos_c][0];

  1716.         C[1]    = s->current_picture.f.motion_val[0][pos_c][1];

  1717.     }

  1718. 

  1719.     total_valid = a_valid + b_valid + c_valid;

  1720.     // check if predictor A is out of bounds

  1721.     if (!s->mb_x && !(n == 1 || n == 3)) {

  1722.         A[0] = A[1] = 0;

  1723.     }

  1724.     // check if predictor B is out of bounds

  1725.     if ((s->first_slice_line && v->blk_mv_type[xy]) || (s->first_slice_line && !(n & 2))) {

  1726.         B[0] = B[1] = C[0] = C[1] = 0;

  1727.     }

  1728.     if (!v->blk_mv_type[xy]) {

  1729.         if (s->mb_width == 1) {

  1730.             px = B[0];

  1731.             py = B[1];

  1732.         } else {

  1733.             if (total_valid >= 2) {

  1734.                 px = mid_pred(A[0], B[0], C[0]);

  1735.                 py = mid_pred(A[1], B[1], C[1]);

  1736.             } else if (total_valid) {

  1737.                 if (a_valid) { px = A[0]; py = A[1]; }

  1738.                 if (b_valid) { px = B[0]; py = B[1]; }

  1739.                 if (c_valid) { px = C[0]; py = C[1]; }

  1740.             } else

  1741.                 px = py = 0;

  1742.         }

  1743.     } else {

  1744.         if (a_valid)

  1745.             field_a = (A[1] & 4) ? 1 : 0;

  1746.         else

  1747.             field_a = 0;

  1748.         if (b_valid)

  1749.             field_b = (B[1] & 4) ? 1 : 0;

  1750.         else

  1751.             field_b = 0;

  1752.         if (c_valid)

  1753.             field_c = (C[1] & 4) ? 1 : 0;

  1754.         else

  1755.             field_c = 0;

  1756. 

  1757.         num_oppfield  = field_a + field_b + field_c;

  1758.         num_samefield = total_valid - num_oppfield;

  1759.         if (total_valid == 3) {

  1760.             if ((num_samefield == 3) || (num_oppfield == 3)) {

  1761.                 px = mid_pred(A[0], B[0], C[0]);

  1762.                 py = mid_pred(A[1], B[1], C[1]);

  1763.             } else if (num_samefield >= num_oppfield) {

  1764.                 /* take one MV from same field set depending on priority

  1765.                 the check for B may not be necessary */

  1766.                 px = !field_a ? A[0] : B[0];

  1767.                 py = !field_a ? A[1] : B[1];

  1768.             } else {

  1769.                 px =  field_a ? A[0] : B[0];

  1770.                 py =  field_a ? A[1] : B[1];

  1771.             }

  1772.         } else if (total_valid == 2) {

  1773.             if (num_samefield >= num_oppfield) {

  1774.                 if (!field_a && a_valid) {

  1775.                     px = A[0];

  1776.                     py = A[1];

  1777.                 } else if (!field_b && b_valid) {

  1778.                     px = B[0];

  1779.                     py = B[1];

  1780.                 } else if (c_valid) {

  1781.                     px = C[0];

  1782.                     py = C[1];

  1783.                 } else px = py = 0;

  1784.             } else {

  1785.                 if (field_a && a_valid) {

  1786.                     px = A[0];

  1787.                     py = A[1];

  1788.                 } else if (field_b && b_valid) {

  1789.                     px = B[0];

  1790.                     py = B[1];

  1791.                 } else if (c_valid) {

  1792.                     px = C[0];

  1793.                     py = C[1];

  1794.                 }

  1795.             }

  1796.         } else if (total_valid == 1) {

  1797.             px = (a_valid) ? A[0] : ((b_valid) ? B[0] : C[0]);

  1798.             py = (a_valid) ? A[1] : ((b_valid) ? B[1] : C[1]);

  1799.         } else

  1800.             px = py = 0;

  1801.     }

  1802. 

  1803.     /* store MV using signed modulus of MV range defined in 4.11 */

  1804.     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;

  1805.     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;

  1806.     if (mvn == 1) { /* duplicate motion data for 1-MV block */

  1807.         s->current_picture.f.motion_val[0][xy +    1    ][0] = s->current_picture.f.motion_val[0][xy][0];

  1808.         s->current_picture.f.motion_val[0][xy +    1    ][1] = s->current_picture.f.motion_val[0][xy][1];

  1809.         s->current_picture.f.motion_val[0][xy + wrap    ][0] = s->current_picture.f.motion_val[0][xy][0];

  1810.         s->current_picture.f.motion_val[0][xy + wrap    ][1] = s->current_picture.f.motion_val[0][xy][1];

  1811.         s->current_picture.f.motion_val[0][xy + wrap + 1][0] = s->current_picture.f.motion_val[0][xy][0];

  1812.         s->current_picture.f.motion_val[0][xy + wrap + 1][1] = s->current_picture.f.motion_val[0][xy][1];

  1813.     } else if (mvn == 2) { /* duplicate motion data for 2-Field MV block */

  1814.         s->current_picture.f.motion_val[0][xy + 1][0] = s->current_picture.f.motion_val[0][xy][0];

  1815.         s->current_picture.f.motion_val[0][xy + 1][1] = s->current_picture.f.motion_val[0][xy][1];

  1816.         s->mv[0][n + 1][0] = s->mv[0][n][0];

  1817.         s->mv[0][n + 1][1] = s->mv[0][n][1];

  1818.     }

  1819. }

  1820. 

  1821. /** Motion compensation for direct or interpolated blocks in B-frames

  1822.  */

  1823. static void vc1_interp_mc(VC1Context *v)

  1824. {

  1825.     MpegEncContext *s = &v->s;

  1826.     DSPContext *dsp = &v->s.dsp;

  1827.     uint8_t *srcY, *srcU, *srcV;

  1828.     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1829.     int off, off_uv;

  1830.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  1831. 

  1832.     if (!v->field_mode && !v->s.next_picture.f.data[0])

  1833.         return;

  1834. 

  1835.     mx   = s->mv[1][0][0];

  1836.     my   = s->mv[1][0][1];

  1837.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1838.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1839.     if (v->field_mode) {

  1840.         if (v->cur_field_type != v->ref_field_type[1])

  1841.             my   = my   - 2 + 4 * v->cur_field_type;

  1842.             uvmy = uvmy - 2 + 4 * v->cur_field_type;

  1843.     }

  1844.     if (v->fastuvmc) {

  1845.         uvmx = uvmx + ((uvmx < 0) ? -(uvmx & 1) : (uvmx & 1));

  1846.         uvmy = uvmy + ((uvmy < 0) ? -(uvmy & 1) : (uvmy & 1));

  1847.     }

  1848.     srcY = s->next_picture.f.data[0];

  1849.     srcU = s->next_picture.f.data[1];

  1850.     srcV = s->next_picture.f.data[2];

  1851. 

  1852.     src_x   = s->mb_x * 16 + (mx   >> 2);

  1853.     src_y   = s->mb_y * 16 + (my   >> 2);

  1854.     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);

  1855.     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

  1856. 

  1857.     if (v->profile != PROFILE_ADVANCED) {

  1858.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1859.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1860.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1861.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1862.     } else {

  1863.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1864.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1865.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1866.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1867.     }

  1868. 

  1869.     srcY += src_y   * s->linesize   + src_x;

  1870.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1871.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1872. 

  1873.     if (v->field_mode && v->ref_field_type[1]) {

  1874.         srcY += s->current_picture_ptr->f.linesize[0];

  1875.         srcU += s->current_picture_ptr->f.linesize[1];

  1876.         srcV += s->current_picture_ptr->f.linesize[2];

  1877.     }

  1878. 

  1879.     /* for grayscale we should not try to read from unknown area */

  1880.     if (s->flags & CODEC_FLAG_GRAY) {

  1881.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1882.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1883.     }

  1884. 

  1885.     if (v->rangeredfrm || s->h_edge_pos < 22 || v_edge_pos < 22

  1886.         || (unsigned)(src_x - 1) > s->h_edge_pos - (mx & 3) - 16 - 3

  1887.         || (unsigned)(src_y - 1) > v_edge_pos    - (my & 3) - 16 - 3) {

  1888.         uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

  1889. 

  1890.         srcY -= s->mspel * (1 + s->linesize);

  1891.         s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize,

  1892.                                 17 + s->mspel * 2, 17 + s->mspel * 2,

  1893.                                 src_x - s->mspel, src_y - s->mspel,

  1894.                                 s->h_edge_pos, v_edge_pos);

  1895.         srcY = s->edge_emu_buffer;

  1896.         s->dsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8 + 1, 8 + 1,

  1897.                                 uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1898.         s->dsp.emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8 + 1, 8 + 1,

  1899.                                 uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  1900.         srcU = uvbuf;

  1901.         srcV = uvbuf + 16;

  1902.         /* if we deal with range reduction we need to scale source blocks */

  1903.         if (v->rangeredfrm) {

  1904.             int i, j;

  1905.             uint8_t *src, *src2;

  1906. 

  1907.             src = srcY;

  1908.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  1909.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  1910.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1911.                 src += s->linesize;

  1912.             }

  1913.             src = srcU;

  1914.             src2 = srcV;

  1915.             for (j = 0; j < 9; j++) {

  1916.                 for (i = 0; i < 9; i++) {

  1917.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  1918.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1919.                 }

  1920.                 src  += s->uvlinesize;

  1921.                 src2 += s->uvlinesize;

  1922.             }

  1923.         }

  1924.         srcY += s->mspel * (1 + s->linesize);

  1925.     }

  1926. 

  1927.     if (v->field_mode && v->cur_field_type) {

  1928.         off    = s->current_picture_ptr->f.linesize[0];

  1929.         off_uv = s->current_picture_ptr->f.linesize[1];

  1930.     } else {

  1931.         off    = 0;

  1932.         off_uv = 0;

  1933.     }

  1934. 

  1935.     if (s->mspel) {

  1936.         dxy = ((my & 3) << 2) | (mx & 3);

  1937.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);

  1938.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);

  1939.         srcY += s->linesize * 8;

  1940.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  1941.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  1942.     } else { // hpel mc

  1943.         dxy = (my & 2) | ((mx & 2) >> 1);

  1944. 

  1945.         if (!v->rnd)

  1946.             dsp->avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  1947.         else

  1948.             dsp->avg_no_rnd_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  1949.     }

  1950. 

  1951.     if (s->flags & CODEC_FLAG_GRAY) return;

  1952.     /* Chroma MC always uses qpel blilinear */

  1953.     uvmx = (uvmx & 3) << 1;

  1954.     uvmy = (uvmy & 3) << 1;

  1955.     if (!v->rnd) {

  1956.         dsp->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  1957.         dsp->avg_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  1958.     } else {

  1959.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  1960.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  1961.     }

  1962. }

  1963. 

  1964. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1965. {

  1966.     int n = bfrac;

  1967. 

  1968. #if B_FRACTION_DEN==256

  1969.     if (inv)

  1970.         n -= 256;

  1971.     if (!qs)

  1972.         return 2 * ((value * n + 255) >> 9);

  1973.     return (value * n + 128) >> 8;

  1974. #else

  1975.     if (inv)

  1976.         n -= B_FRACTION_DEN;

  1977.     if (!qs)

  1978.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1979.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1980. #endif

  1981. }

  1982. 

  1983. /** Reconstruct motion vector for B-frame and do motion compensation

  1984.  */

  1985. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],

  1986.                             int direct, int mode)

  1987. {

  1988.     if (v->use_ic) {

  1989.         v->mv_mode2 = v->mv_mode;

  1990.         v->mv_mode  = MV_PMODE_INTENSITY_COMP;

  1991.     }

  1992.     if (direct) {

  1993.         vc1_mc_1mv(v, 0);

  1994.         vc1_interp_mc(v);

  1995.         if (v->use_ic)

  1996.             v->mv_mode = v->mv_mode2;

  1997.         return;

  1998.     }

  1999.     if (mode == BMV_TYPE_INTERPOLATED) {

  2000.         vc1_mc_1mv(v, 0);

  2001.         vc1_interp_mc(v);

  2002.         if (v->use_ic)

  2003.             v->mv_mode = v->mv_mode2;

  2004.         return;

  2005.     }

  2006. 

  2007.     if (v->use_ic && (mode == BMV_TYPE_BACKWARD))

  2008.         v->mv_mode = v->mv_mode2;

  2009.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  2010.     if (v->use_ic)

  2011.         v->mv_mode = v->mv_mode2;

  2012. }

  2013. 

  2014. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],

  2015.                                  int direct, int mvtype)

  2016. {

  2017.     MpegEncContext *s = &v->s;

  2018.     int xy, wrap, off = 0;

  2019.     int16_t *A, *B, *C;

  2020.     int px, py;

  2021.     int sum;

  2022.     int r_x, r_y;

  2023.     const uint8_t *is_intra = v->mb_type[0];

  2024. 

  2025.     r_x = v->range_x;

  2026.     r_y = v->range_y;

  2027.     /* scale MV difference to be quad-pel */

  2028.     dmv_x[0] <<= 1 - s->quarter_sample;

  2029.     dmv_y[0] <<= 1 - s->quarter_sample;

  2030.     dmv_x[1] <<= 1 - s->quarter_sample;

  2031.     dmv_y[1] <<= 1 - s->quarter_sample;

  2032. 

  2033.     wrap = s->b8_stride;

  2034.     xy = s->block_index[0];

  2035. 

  2036.     if (s->mb_intra) {

  2037.         s->current_picture.f.motion_val[0][xy + v->blocks_off][0] =

  2038.         s->current_picture.f.motion_val[0][xy + v->blocks_off][1] =

  2039.         s->current_picture.f.motion_val[1][xy + v->blocks_off][0] =

  2040.         s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = 0;

  2041.         return;

  2042.     }

  2043.     if (!v->field_mode) {

  2044.         s->mv[0][0][0] = scale_mv(s->next_picture.f.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  2045.         s->mv[0][0][1] = scale_mv(s->next_picture.f.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  2046.         s->mv[1][0][0] = scale_mv(s->next_picture.f.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  2047.         s->mv[1][0][1] = scale_mv(s->next_picture.f.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  2048. 

  2049.         /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  2050.         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));

  2051.         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));

  2052.         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));

  2053.         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));

  2054.     }

  2055.     if (direct) {

  2056.         s->current_picture.f.motion_val[0][xy + v->blocks_off][0] = s->mv[0][0][0];

  2057.         s->current_picture.f.motion_val[0][xy + v->blocks_off][1] = s->mv[0][0][1];

  2058.         s->current_picture.f.motion_val[1][xy + v->blocks_off][0] = s->mv[1][0][0];

  2059.         s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = s->mv[1][0][1];

  2060.         return;

  2061.     }

  2062. 

  2063.     if ((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2064.         C   = s->current_picture.f.motion_val[0][xy - 2];

  2065.         A   = s->current_picture.f.motion_val[0][xy - wrap * 2];

  2066.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2067.         B   = s->current_picture.f.motion_val[0][xy - wrap * 2 + off];

  2068. 

  2069.         if (!s->mb_x) C[0] = C[1] = 0;

  2070.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2071.             if (s->mb_width == 1) {

  2072.                 px = A[0];

  2073.                 py = A[1];

  2074.             } else {

  2075.                 px = mid_pred(A[0], B[0], C[0]);

  2076.                 py = mid_pred(A[1], B[1], C[1]);

  2077.             }

  2078.         } else if (s->mb_x) { // predictor C is not out of bounds

  2079.             px = C[0];

  2080.             py = C[1];

  2081.         } else {

  2082.             px = py = 0;

  2083.         }

  2084.         /* Pullback MV as specified in 8.3.5.3.4 */

  2085.         {

  2086.             int qx, qy, X, Y;

  2087.             if (v->profile < PROFILE_ADVANCED) {

  2088.                 qx = (s->mb_x << 5);

  2089.                 qy = (s->mb_y << 5);

  2090.                 X  = (s->mb_width  << 5) - 4;

  2091.                 Y  = (s->mb_height << 5) - 4;

  2092.                 if (qx + px < -28) px = -28 - qx;

  2093.                 if (qy + py < -28) py = -28 - qy;

  2094.                 if (qx + px > X) px = X - qx;

  2095.                 if (qy + py > Y) py = Y - qy;

  2096.             } else {

  2097.                 qx = (s->mb_x << 6);

  2098.                 qy = (s->mb_y << 6);

  2099.                 X  = (s->mb_width  << 6) - 4;

  2100.                 Y  = (s->mb_height << 6) - 4;

  2101.                 if (qx + px < -60) px = -60 - qx;

  2102.                 if (qy + py < -60) py = -60 - qy;

  2103.                 if (qx + px > X) px = X - qx;

  2104.                 if (qy + py > Y) py = Y - qy;

  2105.             }

  2106.         }

  2107.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2108.         if (0 && !s->first_slice_line && s->mb_x) {

  2109.             if (is_intra[xy - wrap])

  2110.                 sum = FFABS(px) + FFABS(py);

  2111.             else

  2112.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2113.             if (sum > 32) {

  2114.                 if (get_bits1(&s->gb)) {

  2115.                     px = A[0];

  2116.                     py = A[1];

  2117.                 } else {

  2118.                     px = C[0];

  2119.                     py = C[1];

  2120.                 }

  2121.             } else {

  2122.                 if (is_intra[xy - 2])

  2123.                     sum = FFABS(px) + FFABS(py);

  2124.                 else

  2125.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2126.                 if (sum > 32) {

  2127.                     if (get_bits1(&s->gb)) {

  2128.                         px = A[0];

  2129.                         py = A[1];

  2130.                     } else {

  2131.                         px = C[0];

  2132.                         py = C[1];

  2133.                     }

  2134.                 }

  2135.             }

  2136.         }

  2137.         /* store MV using signed modulus of MV range defined in 4.11 */

  2138.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2139.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2140.     }

  2141.     if ((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2142.         C   = s->current_picture.f.motion_val[1][xy - 2];

  2143.         A   = s->current_picture.f.motion_val[1][xy - wrap * 2];

  2144.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2145.         B   = s->current_picture.f.motion_val[1][xy - wrap * 2 + off];

  2146. 

  2147.         if (!s->mb_x)

  2148.             C[0] = C[1] = 0;

  2149.         if (!s->first_slice_line) { // predictor A is not out of bounds

  2150.             if (s->mb_width == 1) {

  2151.                 px = A[0];

  2152.                 py = A[1];

  2153.             } else {

  2154.                 px = mid_pred(A[0], B[0], C[0]);

  2155.                 py = mid_pred(A[1], B[1], C[1]);

  2156.             }

  2157.         } else if (s->mb_x) { // predictor C is not out of bounds

  2158.             px = C[0];

  2159.             py = C[1];

  2160.         } else {

  2161.             px = py = 0;

  2162.         }

  2163.         /* Pullback MV as specified in 8.3.5.3.4 */

  2164.         {

  2165.             int qx, qy, X, Y;

  2166.             if (v->profile < PROFILE_ADVANCED) {

  2167.                 qx = (s->mb_x << 5);

  2168.                 qy = (s->mb_y << 5);

  2169.                 X  = (s->mb_width  << 5) - 4;

  2170.                 Y  = (s->mb_height << 5) - 4;

  2171.                 if (qx + px < -28) px = -28 - qx;

  2172.                 if (qy + py < -28) py = -28 - qy;

  2173.                 if (qx + px > X) px = X - qx;

  2174.                 if (qy + py > Y) py = Y - qy;

  2175.             } else {

  2176.                 qx = (s->mb_x << 6);

  2177.                 qy = (s->mb_y << 6);

  2178.                 X  = (s->mb_width  << 6) - 4;

  2179.                 Y  = (s->mb_height << 6) - 4;

  2180.                 if (qx + px < -60) px = -60 - qx;

  2181.                 if (qy + py < -60) py = -60 - qy;

  2182.                 if (qx + px > X) px = X - qx;

  2183.                 if (qy + py > Y) py = Y - qy;

  2184.             }

  2185.         }

  2186.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2187.         if (0 && !s->first_slice_line && s->mb_x) {

  2188.             if (is_intra[xy - wrap])

  2189.                 sum = FFABS(px) + FFABS(py);

  2190.             else

  2191.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2192.             if (sum > 32) {

  2193.                 if (get_bits1(&s->gb)) {

  2194.                     px = A[0];

  2195.                     py = A[1];

  2196.                 } else {

  2197.                     px = C[0];

  2198.                     py = C[1];

  2199.                 }

  2200.             } else {

  2201.                 if (is_intra[xy - 2])

  2202.                     sum = FFABS(px) + FFABS(py);

  2203.                 else

  2204.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2205.                 if (sum > 32) {

  2206.                     if (get_bits1(&s->gb)) {

  2207.                         px = A[0];

  2208.                         py = A[1];

  2209.                     } else {

  2210.                         px = C[0];

  2211.                         py = C[1];

  2212.                     }

  2213.                 }

  2214.             }

  2215.         }

  2216.         /* store MV using signed modulus of MV range defined in 4.11 */

  2217. 

  2218.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2219.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2220.     }

  2221.     s->current_picture.f.motion_val[0][xy][0] = s->mv[0][0][0];

  2222.     s->current_picture.f.motion_val[0][xy][1] = s->mv[0][0][1];

  2223.     s->current_picture.f.motion_val[1][xy][0] = s->mv[1][0][0];

  2224.     s->current_picture.f.motion_val[1][xy][1] = s->mv[1][0][1];

  2225. }

  2226. 

  2227. static inline void vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y, int mv1, int *pred_flag)

  2228. {

  2229.     int dir = (v->bmvtype == BMV_TYPE_BACKWARD) ? 1 : 0;

  2230.     MpegEncContext *s = &v->s;

  2231.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2232. 

  2233.     if (v->bmvtype == BMV_TYPE_DIRECT) {

  2234.         int total_opp, k, f;

  2235.         if (s->next_picture.f.mb_type[mb_pos + v->mb_off] != MB_TYPE_INTRA) {

  2236.             s->mv[0][0][0] = scale_mv(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2237.                                       v->bfraction, 0, s->quarter_sample);

  2238.             s->mv[0][0][1] = scale_mv(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2239.                                       v->bfraction, 0, s->quarter_sample);

  2240.             s->mv[1][0][0] = scale_mv(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0],

  2241.                                       v->bfraction, 1, s->quarter_sample);

  2242.             s->mv[1][0][1] = scale_mv(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1],

  2243.                                       v->bfraction, 1, s->quarter_sample);

  2244. 

  2245.             total_opp = v->mv_f_next[0][s->block_index[0] + v->blocks_off]

  2246.                       + v->mv_f_next[0][s->block_index[1] + v->blocks_off]

  2247.                       + v->mv_f_next[0][s->block_index[2] + v->blocks_off]

  2248.                       + v->mv_f_next[0][s->block_index[3] + v->blocks_off];

  2249.             f = (total_opp > 2) ? 1 : 0;

  2250.         } else {

  2251.             s->mv[0][0][0] = s->mv[0][0][1] = 0;

  2252.             s->mv[1][0][0] = s->mv[1][0][1] = 0;

  2253.             f = 0;

  2254.         }

  2255.         v->ref_field_type[0] = v->ref_field_type[1] = v->cur_field_type ^ f;

  2256.         for (k = 0; k < 4; k++) {

  2257.             s->current_picture.f.motion_val[0][s->block_index[k] + v->blocks_off][0] = s->mv[0][0][0];

  2258.             s->current_picture.f.motion_val[0][s->block_index[k] + v->blocks_off][1] = s->mv[0][0][1];

  2259.             s->current_picture.f.motion_val[1][s->block_index[k] + v->blocks_off][0] = s->mv[1][0][0];

  2260.             s->current_picture.f.motion_val[1][s->block_index[k] + v->blocks_off][1] = s->mv[1][0][1];

  2261.             v->mv_f[0][s->block_index[k] + v->blocks_off] = f;

  2262.             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;

  2263.         }

  2264.         return;

  2265.     }

  2266.     if (v->bmvtype == BMV_TYPE_INTERPOLATED) {

  2267.         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);

  2268.         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);

  2269.         return;

  2270.     }

  2271.     if (dir) { // backward

  2272.         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);

  2273.         if (n == 3 || mv1) {

  2274.             vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0],   1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  2275.         }

  2276.     } else { // forward

  2277.         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);

  2278.         if (n == 3 || mv1) {

  2279.             vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1],   1, v->range_x, v->range_y, v->mb_type[0], 0, 1);

  2280.         }

  2281.     }

  2282. }

  2283. 

  2284. /** Get predicted DC value for I-frames only

  2285.  * prediction dir: left=0, top=1

  2286.  * @param s MpegEncContext

  2287.  * @param overlap flag indicating that overlap filtering is used

  2288.  * @param pq integer part of picture quantizer

  2289.  * @param[in] n block index in the current MB

  2290.  * @param dc_val_ptr Pointer to DC predictor

  2291.  * @param dir_ptr Prediction direction for use in AC prediction

  2292.  */

  2293. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2294.                                 int16_t **dc_val_ptr, int *dir_ptr)

  2295. {

  2296.     int a, b, c, wrap, pred, scale;

  2297.     int16_t *dc_val;

  2298.     static const uint16_t dcpred[32] = {

  2299.         -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2300.              114,  102,   93,   85,   79,   73,   68,   64,

  2301.               60,   57,   54,   51,   49,   47,   45,   43,

  2302.               41,   39,   38,   37,   35,   34,   33

  2303.     };

  2304. 

  2305.     /* find prediction - wmv3_dc_scale always used here in fact */

  2306.     if (n < 4) scale = s->y_dc_scale;

  2307.     else       scale = s->c_dc_scale;

  2308. 

  2309.     wrap   = s->block_wrap[n];

  2310.     dc_val = s->dc_val[0] + s->block_index[n];

  2311. 

  2312.     /* B A

  2313.      * C X

  2314.      */

  2315.     c = dc_val[ - 1];

  2316.     b = dc_val[ - 1 - wrap];

  2317.     a = dc_val[ - wrap];

  2318. 

  2319.     if (pq < 9 || !overlap) {

  2320.         /* Set outer values */

  2321.         if (s->first_slice_line && (n != 2 && n != 3))

  2322.             b = a = dcpred[scale];

  2323.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2324.             b = c = dcpred[scale];

  2325.     } else {

  2326.         /* Set outer values */

  2327.         if (s->first_slice_line && (n != 2 && n != 3))

  2328.             b = a = 0;

  2329.         if (s->mb_x == 0 && (n != 1 && n != 3))

  2330.             b = c = 0;

  2331.     }

  2332. 

  2333.     if (abs(a - b) <= abs(b - c)) {

  2334.         pred     = c;

  2335.         *dir_ptr = 1; // left

  2336.     } else {

  2337.         pred     = a;

  2338.         *dir_ptr = 0; // top

  2339.     }

  2340. 

  2341.     /* update predictor */

  2342.     *dc_val_ptr = &dc_val[0];

  2343.     return pred;

  2344. }

  2345. 

  2346. 

  2347. /** Get predicted DC value

  2348.  * prediction dir: left=0, top=1

  2349.  * @param s MpegEncContext

  2350.  * @param overlap flag indicating that overlap filtering is used

  2351.  * @param pq integer part of picture quantizer

  2352.  * @param[in] n block index in the current MB

  2353.  * @param a_avail flag indicating top block availability

  2354.  * @param c_avail flag indicating left block availability

  2355.  * @param dc_val_ptr Pointer to DC predictor

  2356.  * @param dir_ptr Prediction direction for use in AC prediction

  2357.  */

  2358. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2359.                               int a_avail, int c_avail,

  2360.                               int16_t **dc_val_ptr, int *dir_ptr)

  2361. {

  2362.     int a, b, c, wrap, pred;

  2363.     int16_t *dc_val;

  2364.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2365.     int q1, q2 = 0;

  2366.     int dqscale_index;

  2367. 

  2368.     wrap = s->block_wrap[n];

  2369.     dc_val = s->dc_val[0] + s->block_index[n];

  2370. 

  2371.     /* B A

  2372.      * C X

  2373.      */

  2374.     c = dc_val[ - 1];

  2375.     b = dc_val[ - 1 - wrap];

  2376.     a = dc_val[ - wrap];

  2377.     /* scale predictors if needed */

  2378.     q1 = s->current_picture.f.qscale_table[mb_pos];

  2379.     dqscale_index = s->y_dc_scale_table[q1] - 1;

  2380.     if (dqscale_index < 0)

  2381.         return 0;

  2382.     if (c_avail && (n != 1 && n != 3)) {

  2383.         q2 = s->current_picture.f.qscale_table[mb_pos - 1];

  2384.         if (q2 && q2 != q1)

  2385.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2386.     }

  2387.     if (a_avail && (n != 2 && n != 3)) {

  2388.         q2 = s->current_picture.f.qscale_table[mb_pos - s->mb_stride];

  2389.         if (q2 && q2 != q1)

  2390.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2391.     }

  2392.     if (a_avail && c_avail && (n != 3)) {

  2393.         int off = mb_pos;

  2394.         if (n != 1)

  2395.             off--;

  2396.         if (n != 2)

  2397.             off -= s->mb_stride;

  2398.         q2 = s->current_picture.f.qscale_table[off];

  2399.         if (q2 && q2 != q1)

  2400.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  2401.     }

  2402. 

  2403.     if (a_avail && c_avail) {

  2404.         if (abs(a - b) <= abs(b - c)) {

  2405.             pred     = c;

  2406.             *dir_ptr = 1; // left

  2407.         } else {

  2408.             pred     = a;

  2409.             *dir_ptr = 0; // top

  2410.         }

  2411.     } else if (a_avail) {

  2412.         pred     = a;

  2413.         *dir_ptr = 0; // top

  2414.     } else if (c_avail) {

  2415.         pred     = c;

  2416.         *dir_ptr = 1; // left

  2417.     } else {

  2418.         pred     = 0;

  2419.         *dir_ptr = 1; // left

  2420.     }

  2421. 

  2422.     /* update predictor */

  2423.     *dc_val_ptr = &dc_val[0];

  2424.     return pred;

  2425. }

  2426. 

  2427. /** @} */ // Block group

  2428. 

  2429. /**

  2430.  * @name VC1 Macroblock-level functions in Simple/Main Profiles

  2431.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2432.  * @{

  2433.  */

  2434. 

  2435. static inline int vc1_coded_block_pred(MpegEncContext * s, int n,

  2436.                                        uint8_t **coded_block_ptr)

  2437. {

  2438.     int xy, wrap, pred, a, b, c;

  2439. 

  2440.     xy   = s->block_index[n];

  2441.     wrap = s->b8_stride;

  2442. 

  2443.     /* B C

  2444.      * A X

  2445.      */

  2446.     a = s->coded_block[xy - 1       ];

  2447.     b = s->coded_block[xy - 1 - wrap];

  2448.     c = s->coded_block[xy     - wrap];

  2449. 

  2450.     if (b == c) {

  2451.         pred = a;

  2452.     } else {

  2453.         pred = c;

  2454.     }

  2455. 

  2456.     /* store value */

  2457.     *coded_block_ptr = &s->coded_block[xy];

  2458. 

  2459.     return pred;

  2460. }

  2461. 

  2462. /**

  2463.  * Decode one AC coefficient

  2464.  * @param v The VC1 context

  2465.  * @param last Last coefficient

  2466.  * @param skip How much zero coefficients to skip

  2467.  * @param value Decoded AC coefficient value

  2468.  * @param codingset set of VLC to decode data

  2469.  * @see 8.1.3.4

  2470.  */

  2471. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,

  2472.                                 int *value, int codingset)

  2473. {

  2474.     GetBitContext *gb = &v->s.gb;

  2475.     int index, escape, run = 0, level = 0, lst = 0;

  2476. 

  2477.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2478.     if (index != ff_vc1_ac_sizes[codingset] - 1) {

  2479.         run   = vc1_index_decode_table[codingset][index][0];

  2480.         level = vc1_index_decode_table[codingset][index][1];

  2481.         lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;

  2482.         if (get_bits1(gb))

  2483.             level = -level;

  2484.     } else {

  2485.         escape = decode210(gb);

  2486.         if (escape != 2) {

  2487.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2488.             run   = vc1_index_decode_table[codingset][index][0];

  2489.             level = vc1_index_decode_table[codingset][index][1];

  2490.             lst   = index >= vc1_last_decode_table[codingset];

  2491.             if (escape == 0) {

  2492.                 if (lst)

  2493.                     level += vc1_last_delta_level_table[codingset][run];

  2494.                 else

  2495.                     level += vc1_delta_level_table[codingset][run];

  2496.             } else {

  2497.                 if (lst)

  2498.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2499.                 else

  2500.                     run += vc1_delta_run_table[codingset][level] + 1;

  2501.             }

  2502.             if (get_bits1(gb))

  2503.                 level = -level;

  2504.         } else {

  2505.             int sign;

  2506.             lst = get_bits1(gb);

  2507.             if (v->s.esc3_level_length == 0) {

  2508.                 if (v->pq < 8 || v->dquantfrm) { // table 59

  2509.                     v->s.esc3_level_length = get_bits(gb, 3);

  2510.                     if (!v->s.esc3_level_length)

  2511.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2512.                 } else { // table 60

  2513.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  2514.                 }

  2515.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2516.             }

  2517.             run   = get_bits(gb, v->s.esc3_run_length);

  2518.             sign  = get_bits1(gb);

  2519.             level = get_bits(gb, v->s.esc3_level_length);

  2520.             if (sign)

  2521.                 level = -level;

  2522.         }

  2523.     }

  2524. 

  2525.     *last  = lst;

  2526.     *skip  = run;

  2527.     *value = level;

  2528. }

  2529. 

  2530. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2531.  * @param v VC1Context

  2532.  * @param block block to decode

  2533.  * @param[in] n subblock index

  2534.  * @param coded are AC coeffs present or not

  2535.  * @param codingset set of VLC to decode data

  2536.  */

  2537. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n,

  2538.                               int coded, int codingset)

  2539. {

  2540.     GetBitContext *gb = &v->s.gb;

  2541.     MpegEncContext *s = &v->s;

  2542.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2543.     int i;

  2544.     int16_t *dc_val;

  2545.     int16_t *ac_val, *ac_val2;

  2546.     int dcdiff;

  2547. 

  2548.     /* Get DC differential */

  2549.     if (n < 4) {

  2550.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2551.     } else {

  2552.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2553.     }

  2554.     if (dcdiff < 0) {

  2555.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2556.         return -1;

  2557.     }

  2558.     if (dcdiff) {

  2559.         if (dcdiff == 119 /* ESC index value */) {

  2560.             /* TODO: Optimize */

  2561.             if (v->pq == 1)      dcdiff = get_bits(gb, 10);

  2562.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2563.             else                 dcdiff = get_bits(gb, 8);

  2564.         } else {

  2565.             if (v->pq == 1)

  2566.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2567.             else if (v->pq == 2)

  2568.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2569.         }

  2570.         if (get_bits1(gb))

  2571.             dcdiff = -dcdiff;

  2572.     }

  2573. 

  2574.     /* Prediction */

  2575.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2576.     *dc_val = dcdiff;

  2577. 

  2578.     /* Store the quantized DC coeff, used for prediction */

  2579.     if (n < 4) {

  2580.         block[0] = dcdiff * s->y_dc_scale;

  2581.     } else {

  2582.         block[0] = dcdiff * s->c_dc_scale;

  2583.     }

  2584.     /* Skip ? */

  2585.     if (!coded) {

  2586.         goto not_coded;

  2587.     }

  2588. 

  2589.     // AC Decoding

  2590.     i = 1;

  2591. 

  2592.     {

  2593.         int last = 0, skip, value;

  2594.         const uint8_t *zz_table;

  2595.         int scale;

  2596.         int k;

  2597. 

  2598.         scale = v->pq * 2 + v->halfpq;

  2599. 

  2600.         if (v->s.ac_pred) {

  2601.             if (!dc_pred_dir)

  2602.                 zz_table = v->zz_8x8[2];

  2603.             else

  2604.                 zz_table = v->zz_8x8[3];

  2605.         } else

  2606.             zz_table = v->zz_8x8[1];

  2607. 

  2608.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2609.         ac_val2 = ac_val;

  2610.         if (dc_pred_dir) // left

  2611.             ac_val -= 16;

  2612.         else // top

  2613.             ac_val -= 16 * s->block_wrap[n];

  2614. 

  2615.         while (!last) {

  2616.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2617.             i += skip;

  2618.             if (i > 63)

  2619.                 break;

  2620.             block[zz_table[i++]] = value;

  2621.         }

  2622. 

  2623.         /* apply AC prediction if needed */

  2624.         if (s->ac_pred) {

  2625.             if (dc_pred_dir) { // left

  2626.                 for (k = 1; k < 8; k++)

  2627.                     block[k << v->left_blk_sh] += ac_val[k];

  2628.             } else { // top

  2629.                 for (k = 1; k < 8; k++)

  2630.                     block[k << v->top_blk_sh] += ac_val[k + 8];

  2631.             }

  2632.         }

  2633.         /* save AC coeffs for further prediction */

  2634.         for (k = 1; k < 8; k++) {

  2635.             ac_val2[k]     = block[k << v->left_blk_sh];

  2636.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2637.         }

  2638. 

  2639.         /* scale AC coeffs */

  2640.         for (k = 1; k < 64; k++)

  2641.             if (block[k]) {

  2642.                 block[k] *= scale;

  2643.                 if (!v->pquantizer)

  2644.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2645.             }

  2646. 

  2647.         if (s->ac_pred) i = 63;

  2648.     }

  2649. 

  2650. not_coded:

  2651.     if (!coded) {

  2652.         int k, scale;

  2653.         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2654.         ac_val2 = ac_val;

  2655. 

  2656.         i = 0;

  2657.         scale = v->pq * 2 + v->halfpq;

  2658.         memset(ac_val2, 0, 16 * 2);

  2659.         if (dc_pred_dir) { // left

  2660.             ac_val -= 16;

  2661.             if (s->ac_pred)

  2662.                 memcpy(ac_val2, ac_val, 8 * 2);

  2663.         } else { // top

  2664.             ac_val -= 16 * s->block_wrap[n];

  2665.             if (s->ac_pred)

  2666.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2667.         }

  2668. 

  2669.         /* apply AC prediction if needed */

  2670.         if (s->ac_pred) {

  2671.             if (dc_pred_dir) { //left

  2672.                 for (k = 1; k < 8; k++) {

  2673.                     block[k << v->left_blk_sh] = ac_val[k] * scale;

  2674.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2675.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -v->pq : v->pq;

  2676.                 }

  2677.             } else { // top

  2678.                 for (k = 1; k < 8; k++) {

  2679.                     block[k << v->top_blk_sh] = ac_val[k + 8] * scale;

  2680.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2681.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -v->pq : v->pq;

  2682.                 }

  2683.             }

  2684.             i = 63;

  2685.         }

  2686.     }

  2687.     s->block_last_index[n] = i;

  2688. 

  2689.     return 0;

  2690. }

  2691. 

  2692. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2693.  * @param v VC1Context

  2694.  * @param block block to decode

  2695.  * @param[in] n subblock number

  2696.  * @param coded are AC coeffs present or not

  2697.  * @param codingset set of VLC to decode data

  2698.  * @param mquant quantizer value for this macroblock

  2699.  */

  2700. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n,

  2701.                                   int coded, int codingset, int mquant)

  2702. {

  2703.     GetBitContext *gb = &v->s.gb;

  2704.     MpegEncContext *s = &v->s;

  2705.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2706.     int i;

  2707.     int16_t *dc_val;

  2708.     int16_t *ac_val, *ac_val2;

  2709.     int dcdiff;

  2710.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2711.     int use_pred = s->ac_pred;

  2712.     int scale;

  2713.     int q1, q2 = 0;

  2714.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2715. 

  2716.     /* Get DC differential */

  2717.     if (n < 4) {

  2718.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2719.     } else {

  2720.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2721.     }

  2722.     if (dcdiff < 0) {

  2723.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2724.         return -1;

  2725.     }

  2726.     if (dcdiff) {

  2727.         if (dcdiff == 119 /* ESC index value */) {

  2728.             /* TODO: Optimize */

  2729.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  2730.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2731.             else                  dcdiff = get_bits(gb, 8);

  2732.         } else {

  2733.             if (mquant == 1)

  2734.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2735.             else if (mquant == 2)

  2736.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2737.         }

  2738.         if (get_bits1(gb))

  2739.             dcdiff = -dcdiff;

  2740.     }

  2741. 

  2742.     /* Prediction */

  2743.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2744.     *dc_val = dcdiff;

  2745. 

  2746.     /* Store the quantized DC coeff, used for prediction */

  2747.     if (n < 4) {

  2748.         block[0] = dcdiff * s->y_dc_scale;

  2749.     } else {

  2750.         block[0] = dcdiff * s->c_dc_scale;

  2751.     }

  2752. 

  2753.     //AC Decoding

  2754.     i = 1;

  2755. 

  2756.     /* check if AC is needed at all */

  2757.     if (!a_avail && !c_avail)

  2758.         use_pred = 0;

  2759.     ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  2760.     ac_val2 = ac_val;

  2761. 

  2762.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  2763. 

  2764.     if (dc_pred_dir) // left

  2765.         ac_val -= 16;

  2766.     else // top

  2767.         ac_val -= 16 * s->block_wrap[n];

  2768. 

  2769.     q1 = s->current_picture.f.qscale_table[mb_pos];

  2770.     if ( dc_pred_dir && c_avail && mb_pos)

  2771.         q2 = s->current_picture.f.qscale_table[mb_pos - 1];

  2772.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  2773.         q2 = s->current_picture.f.qscale_table[mb_pos - s->mb_stride];

  2774.     if ( dc_pred_dir && n == 1)

  2775.         q2 = q1;

  2776.     if (!dc_pred_dir && n == 2)

  2777.         q2 = q1;

  2778.     if (n == 3)

  2779.         q2 = q1;

  2780. 

  2781.     if (coded) {

  2782.         int last = 0, skip, value;

  2783.         const uint8_t *zz_table;

  2784.         int k;

  2785. 

  2786.         if (v->s.ac_pred) {

  2787.             if (!use_pred && v->fcm == ILACE_FRAME) {

  2788.                 zz_table = v->zzi_8x8;

  2789.             } else {

  2790.                 if (!dc_pred_dir) // top

  2791.                     zz_table = v->zz_8x8[2];

  2792.                 else // left

  2793.                     zz_table = v->zz_8x8[3];

  2794.             }

  2795.         } else {

  2796.             if (v->fcm != ILACE_FRAME)

  2797.                 zz_table = v->zz_8x8[1];

  2798.             else

  2799.                 zz_table = v->zzi_8x8;

  2800.         }

  2801. 

  2802.         while (!last) {

  2803.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2804.             i += skip;

  2805.             if (i > 63)

  2806.                 break;

  2807.             block[zz_table[i++]] = value;

  2808.         }

  2809. 

  2810.         /* apply AC prediction if needed */

  2811.         if (use_pred) {

  2812.             /* scale predictors if needed*/

  2813.             if (q2 && q1 != q2) {

  2814.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2815.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2816. 

  2817.                 if (q1 < 1)

  2818.                     return AVERROR_INVALIDDATA;

  2819.                 if (dc_pred_dir) { // left

  2820.                     for (k = 1; k < 8; k++)

  2821.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2822.                 } else { // top

  2823.                     for (k = 1; k < 8; k++)

  2824.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2825.                 }

  2826.             } else {

  2827.                 if (dc_pred_dir) { //left

  2828.                     for (k = 1; k < 8; k++)

  2829.                         block[k << v->left_blk_sh] += ac_val[k];

  2830.                 } else { //top

  2831.                     for (k = 1; k < 8; k++)

  2832.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  2833.                 }

  2834.             }

  2835.         }

  2836.         /* save AC coeffs for further prediction */

  2837.         for (k = 1; k < 8; k++) {

  2838.             ac_val2[k    ] = block[k << v->left_blk_sh];

  2839.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  2840.         }

  2841. 

  2842.         /* scale AC coeffs */

  2843.         for (k = 1; k < 64; k++)

  2844.             if (block[k]) {

  2845.                 block[k] *= scale;

  2846.                 if (!v->pquantizer)

  2847.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2848.             }

  2849. 

  2850.         if (use_pred) i = 63;

  2851.     } else { // no AC coeffs

  2852.         int k;

  2853. 

  2854.         memset(ac_val2, 0, 16 * 2);

  2855.         if (dc_pred_dir) { // left

  2856.             if (use_pred) {

  2857.                 memcpy(ac_val2, ac_val, 8 * 2);

  2858.                 if (q2 && q1 != q2) {

  2859.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2860.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2861.                     if (q1 < 1)

  2862.                         return AVERROR_INVALIDDATA;

  2863.                     for (k = 1; k < 8; k++)

  2864.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2865.                 }

  2866.             }

  2867.         } else { // top

  2868.             if (use_pred) {

  2869.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2870.                 if (q2 && q1 != q2) {

  2871.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2872.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2873.                     if (q1 < 1)

  2874.                         return AVERROR_INVALIDDATA;

  2875.                     for (k = 1; k < 8; k++)

  2876.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2877.                 }

  2878.             }

  2879.         }

  2880. 

  2881.         /* apply AC prediction if needed */

  2882.         if (use_pred) {

  2883.             if (dc_pred_dir) { // left

  2884.                 for (k = 1; k < 8; k++) {

  2885.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  2886.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  2887.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  2888.                 }

  2889.             } else { // top

  2890.                 for (k = 1; k < 8; k++) {

  2891.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  2892.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  2893.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  2894.                 }

  2895.             }

  2896.             i = 63;

  2897.         }

  2898.     }

  2899.     s->block_last_index[n] = i;

  2900. 

  2901.     return 0;

  2902. }

  2903. 

  2904. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2905.  * @param v VC1Context

  2906.  * @param block block to decode

  2907.  * @param[in] n subblock index

  2908.  * @param coded are AC coeffs present or not

  2909.  * @param mquant block quantizer

  2910.  * @param codingset set of VLC to decode data

  2911.  */

  2912. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n,

  2913.                                   int coded, int mquant, int codingset)

  2914. {

  2915.     GetBitContext *gb = &v->s.gb;

  2916.     MpegEncContext *s = &v->s;

  2917.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2918.     int i;

  2919.     int16_t *dc_val;

  2920.     int16_t *ac_val, *ac_val2;

  2921.     int dcdiff;

  2922.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2923.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2924.     int use_pred = s->ac_pred;

  2925.     int scale;

  2926.     int q1, q2 = 0;

  2927. 

  2928.     s->dsp.clear_block(block);

  2929. 

  2930.     /* XXX: Guard against dumb values of mquant */

  2931.     mquant = (mquant < 1) ? 0 : ((mquant > 31) ? 31 : mquant);

  2932. 

  2933.     /* Set DC scale - y and c use the same */

  2934.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2935.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2936. 

  2937.     /* Get DC differential */

  2938.     if (n < 4) {

  2939.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2940.     } else {

  2941.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2942.     }

  2943.     if (dcdiff < 0) {

  2944.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2945.         return -1;

  2946.     }

  2947.     if (dcdiff) {

  2948.         if (dcdiff == 119 /* ESC index value */) {

  2949.             /* TODO: Optimize */

  2950.             if (mquant == 1)      dcdiff = get_bits(gb, 10);

  2951.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2952.             else                  dcdiff = get_bits(gb, 8);

  2953.         } else {

  2954.             if (mquant == 1)

  2955.                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;

  2956.             else if (mquant == 2)

  2957.                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;

  2958.         }

  2959.         if (get_bits1(gb))

  2960.             dcdiff = -dcdiff;

  2961.     }

  2962. 

  2963.     /* Prediction */

  2964.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2965.     *dc_val = dcdiff;

  2966. 

  2967.     /* Store the quantized DC coeff, used for prediction */

  2968. 

  2969.     if (n < 4) {

  2970.         block[0] = dcdiff * s->y_dc_scale;

  2971.     } else {

  2972.         block[0] = dcdiff * s->c_dc_scale;

  2973.     }

  2974. 

  2975.     //AC Decoding

  2976.     i = 1;

  2977. 

  2978.     /* check if AC is needed at all and adjust direction if needed */

  2979.     if (!a_avail) dc_pred_dir = 1;

  2980.     if (!c_avail) dc_pred_dir = 0;

  2981.     if (!a_avail && !c_avail) use_pred = 0;

  2982.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2983.     ac_val2 = ac_val;

  2984. 

  2985.     scale = mquant * 2 + v->halfpq;

  2986. 

  2987.     if (dc_pred_dir) //left

  2988.         ac_val -= 16;

  2989.     else //top

  2990.         ac_val -= 16 * s->block_wrap[n];

  2991. 

  2992.     q1 = s->current_picture.f.qscale_table[mb_pos];

  2993.     if (dc_pred_dir && c_avail && mb_pos)

  2994.         q2 = s->current_picture.f.qscale_table[mb_pos - 1];

  2995.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  2996.         q2 = s->current_picture.f.qscale_table[mb_pos - s->mb_stride];

  2997.     if ( dc_pred_dir && n == 1)

  2998.         q2 = q1;

  2999.     if (!dc_pred_dir && n == 2)

  3000.         q2 = q1;

  3001.     if (n == 3) q2 = q1;

  3002. 

  3003.     if (coded) {

  3004.         int last = 0, skip, value;

  3005.         int k;

  3006. 

  3007.         while (!last) {

  3008.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  3009.             i += skip;

  3010.             if (i > 63)

  3011.                 break;

  3012.             if (v->fcm == PROGRESSIVE)

  3013.                 block[v->zz_8x8[0][i++]] = value;

  3014.             else {

  3015.                 if (use_pred && (v->fcm == ILACE_FRAME)) {

  3016.                     if (!dc_pred_dir) // top

  3017.                         block[v->zz_8x8[2][i++]] = value;

  3018.                     else // left

  3019.                         block[v->zz_8x8[3][i++]] = value;

  3020.                 } else {

  3021.                     block[v->zzi_8x8[i++]] = value;

  3022.                 }

  3023.             }

  3024.         }

  3025. 

  3026.         /* apply AC prediction if needed */

  3027.         if (use_pred) {

  3028.             /* scale predictors if needed*/

  3029.             if (q2 && q1 != q2) {

  3030.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3031.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3032. 

  3033.                 if (q1 < 1)

  3034.                     return AVERROR_INVALIDDATA;

  3035.                 if (dc_pred_dir) { // left

  3036.                     for (k = 1; k < 8; k++)

  3037.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3038.                 } else { //top

  3039.                     for (k = 1; k < 8; k++)

  3040.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3041.                 }

  3042.             } else {

  3043.                 if (dc_pred_dir) { // left

  3044.                     for (k = 1; k < 8; k++)

  3045.                         block[k << v->left_blk_sh] += ac_val[k];

  3046.                 } else { // top

  3047.                     for (k = 1; k < 8; k++)

  3048.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  3049.                 }

  3050.             }

  3051.         }

  3052.         /* save AC coeffs for further prediction */

  3053.         for (k = 1; k < 8; k++) {

  3054.             ac_val2[k    ] = block[k << v->left_blk_sh];

  3055.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  3056.         }

  3057. 

  3058.         /* scale AC coeffs */

  3059.         for (k = 1; k < 64; k++)

  3060.             if (block[k]) {

  3061.                 block[k] *= scale;

  3062.                 if (!v->pquantizer)

  3063.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  3064.             }

  3065. 

  3066.         if (use_pred) i = 63;

  3067.     } else { // no AC coeffs

  3068.         int k;

  3069. 

  3070.         memset(ac_val2, 0, 16 * 2);

  3071.         if (dc_pred_dir) { // left

  3072.             if (use_pred) {

  3073.                 memcpy(ac_val2, ac_val, 8 * 2);

  3074.                 if (q2 && q1 != q2) {

  3075.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3076.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3077.                     if (q1 < 1)

  3078.                         return AVERROR_INVALIDDATA;

  3079.                     for (k = 1; k < 8; k++)

  3080.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3081.                 }

  3082.             }

  3083.         } else { // top

  3084.             if (use_pred) {

  3085.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  3086.                 if (q2 && q1 != q2) {

  3087.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  3088.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  3089.                     if (q1 < 1)

  3090.                         return AVERROR_INVALIDDATA;

  3091.                     for (k = 1; k < 8; k++)

  3092.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  3093.                 }

  3094.             }

  3095.         }

  3096. 

  3097.         /* apply AC prediction if needed */

  3098.         if (use_pred) {

  3099.             if (dc_pred_dir) { // left

  3100.                 for (k = 1; k < 8; k++) {

  3101.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  3102.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  3103.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  3104.                 }

  3105.             } else { // top

  3106.                 for (k = 1; k < 8; k++) {

  3107.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  3108.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  3109.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  3110.                 }

  3111.             }

  3112.             i = 63;

  3113.         }

  3114.     }

  3115.     s->block_last_index[n] = i;

  3116. 

  3117.     return 0;

  3118. }

  3119. 

  3120. /** Decode P block

  3121.  */

  3122. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n,

  3123.                               int mquant, int ttmb, int first_block,

  3124.                               uint8_t *dst, int linesize, int skip_block,

  3125.                               int *ttmb_out)

  3126. {

  3127.     MpegEncContext *s = &v->s;

  3128.     GetBitContext *gb = &s->gb;

  3129.     int i, j;

  3130.     int subblkpat = 0;

  3131.     int scale, off, idx, last, skip, value;

  3132.     int ttblk = ttmb & 7;

  3133.     int pat = 0;

  3134. 

  3135.     s->dsp.clear_block(block);

  3136. 

  3137.     if (ttmb == -1) {

  3138.         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)];

  3139.     }

  3140.     if (ttblk == TT_4X4) {

  3141.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  3142.     }

  3143.     if ((ttblk != TT_8X8 && ttblk != TT_4X4)

  3144.         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))

  3145.             || (!v->res_rtm_flag && !first_block))) {

  3146.         subblkpat = decode012(gb);

  3147.         if (subblkpat)

  3148.             subblkpat ^= 3; // swap decoded pattern bits

  3149.         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)

  3150.             ttblk = TT_8X4;

  3151.         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)

  3152.             ttblk = TT_4X8;

  3153.     }

  3154.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  3155. 

  3156.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  3157.     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  3158.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  3159.         ttblk     = TT_8X4;

  3160.     }

  3161.     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  3162.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  3163.         ttblk     = TT_4X8;

  3164.     }

  3165.     switch (ttblk) {

  3166.     case TT_8X8:

  3167.         pat  = 0xF;

  3168.         i    = 0;

  3169.         last = 0;

  3170.         while (!last) {

  3171.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3172.             i += skip;

  3173.             if (i > 63)

  3174.                 break;

  3175.             if (!v->fcm)

  3176.                 idx = v->zz_8x8[0][i++];

  3177.             else

  3178.                 idx = v->zzi_8x8[i++];

  3179.             block[idx] = value * scale;

  3180.             if (!v->pquantizer)

  3181.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3182.         }

  3183.         if (!skip_block) {

  3184.             if (i == 1)

  3185.                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);

  3186.             else {

  3187.                 v->vc1dsp.vc1_inv_trans_8x8(block);

  3188.                 s->dsp.add_pixels_clamped(block, dst, linesize);

  3189.             }

  3190.         }

  3191.         break;

  3192.     case TT_4X4:

  3193.         pat = ~subblkpat & 0xF;

  3194.         for (j = 0; j < 4; j++) {

  3195.             last = subblkpat & (1 << (3 - j));

  3196.             i    = 0;

  3197.             off  = (j & 1) * 4 + (j & 2) * 16;

  3198.             while (!last) {

  3199.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3200.                 i += skip;

  3201.                 if (i > 15)

  3202.                     break;

  3203.                 if (!v->fcm)

  3204.                     idx = ff_vc1_simple_progressive_4x4_zz[i++];

  3205.                 else

  3206.                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];

  3207.                 block[idx + off] = value * scale;

  3208.                 if (!v->pquantizer)

  3209.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3210.             }

  3211.             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {

  3212.                 if (i == 1)

  3213.                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);

  3214.                 else

  3215.                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);

  3216.             }

  3217.         }

  3218.         break;

  3219.     case TT_8X4:

  3220.         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;

  3221.         for (j = 0; j < 2; j++) {

  3222.             last = subblkpat & (1 << (1 - j));

  3223.             i    = 0;

  3224.             off  = j * 32;

  3225.             while (!last) {

  3226.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3227.                 i += skip;

  3228.                 if (i > 31)

  3229.                     break;

  3230.                 if (!v->fcm)

  3231.                     idx = v->zz_8x4[i++] + off;

  3232.                 else

  3233.                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;

  3234.                 block[idx] = value * scale;

  3235.                 if (!v->pquantizer)

  3236.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3237.             }

  3238.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3239.                 if (i == 1)

  3240.                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);

  3241.                 else

  3242.                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);

  3243.             }

  3244.         }

  3245.         break;

  3246.     case TT_4X8:

  3247.         pat = ~(subblkpat * 5) & 0xF;

  3248.         for (j = 0; j < 2; j++) {

  3249.             last = subblkpat & (1 << (1 - j));

  3250.             i    = 0;

  3251.             off  = j * 4;

  3252.             while (!last) {

  3253.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3254.                 i += skip;

  3255.                 if (i > 31)

  3256.                     break;

  3257.                 if (!v->fcm)

  3258.                     idx = v->zz_4x8[i++] + off;

  3259.                 else

  3260.                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;

  3261.                 block[idx] = value * scale;

  3262.                 if (!v->pquantizer)

  3263.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  3264.             }

  3265.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  3266.                 if (i == 1)

  3267.                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);

  3268.                 else

  3269.                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  3270.             }

  3271.         }

  3272.         break;

  3273.     }

  3274.     if (ttmb_out)

  3275.         *ttmb_out |= ttblk << (n * 4);

  3276.     return pat;

  3277. }

  3278. 

  3279. /** @} */ // Macroblock group

  3280. 

  3281. static const int size_table  [6] = { 0, 2, 3, 4,  5,  8 };

  3282. static const int offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3283. 

  3284. static av_always_inline void vc1_apply_p_v_loop_filter(VC1Context *v, int block_num)

  3285. {

  3286.     MpegEncContext *s  = &v->s;

  3287.     int mb_cbp         = v->cbp[s->mb_x - s->mb_stride],

  3288.         block_cbp      = mb_cbp      >> (block_num * 4), bottom_cbp,

  3289.         mb_is_intra    = v->is_intra[s->mb_x - s->mb_stride],

  3290.         block_is_intra = mb_is_intra >> (block_num * 4), bottom_is_intra;

  3291.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3292.     uint8_t *dst;

  3293. 

  3294.     if (block_num > 3) {

  3295.         dst      = s->dest[block_num - 3];

  3296.     } else {

  3297.         dst      = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 8) * linesize;

  3298.     }

  3299.     if (s->mb_y != s->end_mb_y || block_num < 2) {

  3300.         int16_t (*mv)[2];

  3301.         int mv_stride;

  3302. 

  3303.         if (block_num > 3) {

  3304.             bottom_cbp      = v->cbp[s->mb_x]      >> (block_num * 4);

  3305.             bottom_is_intra = v->is_intra[s->mb_x] >> (block_num * 4);

  3306.             mv              = &v->luma_mv[s->mb_x - s->mb_stride];

  3307.             mv_stride       = s->mb_stride;

  3308.         } else {

  3309.             bottom_cbp      = (block_num < 2) ? (mb_cbp               >> ((block_num + 2) * 4))

  3310.                                               : (v->cbp[s->mb_x]      >> ((block_num - 2) * 4));

  3311.             bottom_is_intra = (block_num < 2) ? (mb_is_intra          >> ((block_num + 2) * 4))

  3312.                                               : (v->is_intra[s->mb_x] >> ((block_num - 2) * 4));

  3313.             mv_stride       = s->b8_stride;

  3314.             mv              = &s->current_picture.f.motion_val[0][s->block_index[block_num] - 2 * mv_stride];

  3315.         }

  3316. 

  3317.         if (bottom_is_intra & 1 || block_is_intra & 1 ||

  3318.             mv[0][0] != mv[mv_stride][0] || mv[0][1] != mv[mv_stride][1]) {

  3319.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3320.         } else {

  3321.             idx = ((bottom_cbp >> 2) | block_cbp) & 3;

  3322.             if (idx == 3) {

  3323.                 v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3324.             } else if (idx) {

  3325.                 if (idx == 1)

  3326.                     v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3327.                 else

  3328.                     v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3329.             }

  3330.         }

  3331.     }

  3332. 

  3333.     dst -= 4 * linesize;

  3334.     ttblk = (v->ttblk[s->mb_x - s->mb_stride] >> (block_num * 4)) & 0xF;

  3335.     if (ttblk == TT_4X4 || ttblk == TT_8X4) {

  3336.         idx = (block_cbp | (block_cbp >> 2)) & 3;

  3337.         if (idx == 3) {

  3338.             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);

  3339.         } else if (idx) {

  3340.             if (idx == 1)

  3341.                 v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);

  3342.             else

  3343.                 v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);

  3344.         }

  3345.     }

  3346. }

  3347. 

  3348. static av_always_inline void vc1_apply_p_h_loop_filter(VC1Context *v, int block_num)

  3349. {

  3350.     MpegEncContext *s  = &v->s;

  3351.     int mb_cbp         = v->cbp[s->mb_x - 1 - s->mb_stride],

  3352.         block_cbp      = mb_cbp      >> (block_num * 4), right_cbp,

  3353.         mb_is_intra    = v->is_intra[s->mb_x - 1 - s->mb_stride],

  3354.         block_is_intra = mb_is_intra >> (block_num * 4), right_is_intra;

  3355.     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

  3356.     uint8_t *dst;

  3357. 

  3358.     if (block_num > 3) {

  3359.         dst = s->dest[block_num - 3] - 8 * linesize;

  3360.     } else {

  3361.         dst = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 16) * linesize - 8;

  3362.     }

  3363. 

  3364.     if (s->mb_x != s->mb_width || !(block_num & 5)) {

  3365.         int16_t (*mv)[2];

  3366. 

  3367.         if (block_num > 3) {

  3368.             right_cbp      = v->cbp[s->mb_x - s->mb_stride] >> (block_num * 4);

  3369.             right_is_intra = v->is_intra[s->mb_x - s->mb_stride] >> (block_num * 4);

  3370.             mv             = &v->luma_mv[s->mb_x - s->mb_stride - 1];

  3371.         } else {

  3372.             right_cbp      = (block_num & 1) ? (v->cbp[s->mb_x - s->mb_stride]      >> ((block_num - 1) * 4))

  3373.                                              : (mb_cbp                              >> ((block_num + 1) * 4));

  3374.             right_is_intra = (block_num & 1) ? (v->is_intra[s->mb_x - s->mb_stride] >> ((block_num - 1) * 4))

  3375.                                              : (mb_is_intra                         >> ((block_num + 1) * 4));

  3376.             mv             = &s->current_picture.f.motion_val[0][s->block_index[block_num] - s->b8_stride * 2 - 2];

  3377.         }

  3378.         if (block_is_intra & 1 || right_is_intra & 1 || mv[0][0] != mv[1][0] || mv[0][1] != mv[1][1]) {

  3379.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3380.         } else {

  3381.             idx = ((right_cbp >> 1) | block_cbp) & 5; // FIXME check

  3382.             if (idx == 5) {

  3383.                 v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3384.             } else if (idx) {

  3385.                 if (idx == 1)

  3386.                     v->vc1dsp.vc1_h_loop_filter4(dst + 4 * linesize, linesize, v->pq);

  3387.                 else

  3388.                     v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3389.             }

  3390.         }

  3391.     }

  3392. 

  3393.     dst -= 4;

  3394.     ttblk = (v->ttblk[s->mb_x - s->mb_stride - 1] >> (block_num * 4)) & 0xf;

  3395.     if (ttblk == TT_4X4 || ttblk == TT_4X8) {

  3396.         idx = (block_cbp | (block_cbp >> 1)) & 5;

  3397.         if (idx == 5) {

  3398.             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);

  3399.         } else if (idx) {

  3400.             if (idx == 1)

  3401.                 v->vc1dsp.vc1_h_loop_filter4(dst + linesize * 4, linesize, v->pq);

  3402.             else

  3403.                 v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

  3404.         }

  3405.     }

  3406. }

  3407. 

  3408. static void vc1_apply_p_loop_filter(VC1Context *v)

  3409. {

  3410.     MpegEncContext *s = &v->s;

  3411.     int i;

  3412. 

  3413.     for (i = 0; i < 6; i++) {

  3414.         vc1_apply_p_v_loop_filter(v, i);

  3415.     }

  3416. 

  3417.     /* V always precedes H, therefore we run H one MB before V;

  3418.      * at the end of a row, we catch up to complete the row */

  3419.     if (s->mb_x) {

  3420.         for (i = 0; i < 6; i++) {

  3421.             vc1_apply_p_h_loop_filter(v, i);

  3422.         }

  3423.         if (s->mb_x == s->mb_width - 1) {

  3424.             s->mb_x++;

  3425.             ff_update_block_index(s);

  3426.             for (i = 0; i < 6; i++) {

  3427.                 vc1_apply_p_h_loop_filter(v, i);

  3428.             }

  3429.         }

  3430.     }

  3431. }

  3432. 

  3433. /** Decode one P-frame MB

  3434.  */

  3435. static int vc1_decode_p_mb(VC1Context *v)

  3436. {

  3437.     MpegEncContext *s = &v->s;

  3438.     GetBitContext *gb = &s->gb;

  3439.     int i, j;

  3440.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3441.     int cbp; /* cbp decoding stuff */

  3442.     int mqdiff, mquant; /* MB quantization */

  3443.     int ttmb = v->ttfrm; /* MB Transform type */

  3444. 

  3445.     int mb_has_coeffs = 1; /* last_flag */

  3446.     int dmv_x, dmv_y; /* Differential MV components */

  3447.     int index, index1; /* LUT indexes */

  3448.     int val, sign; /* temp values */

  3449.     int first_block = 1;

  3450.     int dst_idx, off;

  3451.     int skipped, fourmv;

  3452.     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;

  3453. 

  3454.     mquant = v->pq; /* lossy initialization */

  3455. 

  3456.     if (v->mv_type_is_raw)

  3457.         fourmv = get_bits1(gb);

  3458.     else

  3459.         fourmv = v->mv_type_mb_plane[mb_pos];

  3460.     if (v->skip_is_raw)

  3461.         skipped = get_bits1(gb);

  3462.     else

  3463.         skipped = v->s.mbskip_table[mb_pos];

  3464. 

  3465.     if (!fourmv) { /* 1MV mode */

  3466.         if (!skipped) {

  3467.             GET_MVDATA(dmv_x, dmv_y);

  3468. 

  3469.             if (s->mb_intra) {

  3470.                 s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;

  3471.                 s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;

  3472.             }

  3473.             s->current_picture.f.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3474.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3475. 

  3476.             /* FIXME Set DC val for inter block ? */

  3477.             if (s->mb_intra && !mb_has_coeffs) {

  3478.                 GET_MQUANT();

  3479.                 s->ac_pred = get_bits1(gb);

  3480.                 cbp        = 0;

  3481.             } else if (mb_has_coeffs) {

  3482.                 if (s->mb_intra)

  3483.                     s->ac_pred = get_bits1(gb);

  3484.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3485.                 GET_MQUANT();

  3486.             } else {

  3487.                 mquant = v->pq;

  3488.                 cbp    = 0;

  3489.             }

  3490.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  3491. 

  3492.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3493.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3494.                                 VC1_TTMB_VLC_BITS, 2);

  3495.             if (!s->mb_intra) vc1_mc_1mv(v, 0);

  3496.             dst_idx = 0;

  3497.             for (i = 0; i < 6; i++) {

  3498.                 s->dc_val[0][s->block_index[i]] = 0;

  3499.                 dst_idx += i >> 2;

  3500.                 val = ((cbp >> (5 - i)) & 1);

  3501.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3502.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3503.                 if (s->mb_intra) {

  3504.                     /* check if prediction blocks A and C are available */

  3505.                     v->a_avail = v->c_avail = 0;

  3506.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3507.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3508.                     if (i == 1 || i == 3 || s->mb_x)

  3509.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3510. 

  3511.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3512.                                            (i & 4) ? v->codingset2 : v->codingset);

  3513.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3514.                         continue;

  3515.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3516.                     if (v->rangeredfrm)

  3517.                         for (j = 0; j < 64; j++)

  3518.                             s->block[i][j] <<= 1;

  3519.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3520.                     if (v->pq >= 9 && v->overlap) {

  3521.                         if (v->c_avail)

  3522.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3523.                         if (v->a_avail)

  3524.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3525.                     }

  3526.                     block_cbp   |= 0xF << (i << 2);

  3527.                     block_intra |= 1 << i;

  3528.                 } else if (val) {

  3529.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block,

  3530.                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,

  3531.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3532.                     block_cbp |= pat << (i << 2);

  3533.                     if (!v->ttmbf && ttmb < 8)

  3534.                         ttmb = -1;

  3535.                     first_block = 0;

  3536.                 }

  3537.             }

  3538.         } else { // skipped

  3539.             s->mb_intra = 0;

  3540.             for (i = 0; i < 6; i++) {

  3541.                 v->mb_type[0][s->block_index[i]] = 0;

  3542.                 s->dc_val[0][s->block_index[i]]  = 0;

  3543.             }

  3544.             s->current_picture.f.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3545.             s->current_picture.f.qscale_table[mb_pos] = 0;

  3546.             vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3547.             vc1_mc_1mv(v, 0);

  3548.         }

  3549.     } else { // 4MV mode

  3550.         if (!skipped /* unskipped MB */) {

  3551.             int intra_count = 0, coded_inter = 0;

  3552.             int is_intra[6], is_coded[6];

  3553.             /* Get CBPCY */

  3554.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3555.             for (i = 0; i < 6; i++) {

  3556.                 val = ((cbp >> (5 - i)) & 1);

  3557.                 s->dc_val[0][s->block_index[i]] = 0;

  3558.                 s->mb_intra                     = 0;

  3559.                 if (i < 4) {

  3560.                     dmv_x = dmv_y = 0;

  3561.                     s->mb_intra   = 0;

  3562.                     mb_has_coeffs = 0;

  3563.                     if (val) {

  3564.                         GET_MVDATA(dmv_x, dmv_y);

  3565.                     }

  3566.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3567.                     if (!s->mb_intra)

  3568.                         vc1_mc_4mv_luma(v, i, 0);

  3569.                     intra_count += s->mb_intra;

  3570.                     is_intra[i]  = s->mb_intra;

  3571.                     is_coded[i]  = mb_has_coeffs;

  3572.                 }

  3573.                 if (i & 4) {

  3574.                     is_intra[i] = (intra_count >= 3);

  3575.                     is_coded[i] = val;

  3576.                 }

  3577.                 if (i == 4)

  3578.                     vc1_mc_4mv_chroma(v, 0);

  3579.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3580.                 if (!coded_inter)

  3581.                     coded_inter = !is_intra[i] & is_coded[i];

  3582.             }

  3583.             // if there are no coded blocks then don't do anything more

  3584.             dst_idx = 0;

  3585.             if (!intra_count && !coded_inter)

  3586.                 goto end;

  3587.             GET_MQUANT();

  3588.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  3589.             /* test if block is intra and has pred */

  3590.             {

  3591.                 int intrapred = 0;

  3592.                 for (i = 0; i < 6; i++)

  3593.                     if (is_intra[i]) {

  3594.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3595.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3596.                             intrapred = 1;

  3597.                             break;

  3598.                         }

  3599.                     }

  3600.                 if (intrapred)

  3601.                     s->ac_pred = get_bits1(gb);

  3602.                 else

  3603.                     s->ac_pred = 0;

  3604.             }

  3605.             if (!v->ttmbf && coded_inter)

  3606.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3607.             for (i = 0; i < 6; i++) {

  3608.                 dst_idx    += i >> 2;

  3609.                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3610.                 s->mb_intra = is_intra[i];

  3611.                 if (is_intra[i]) {

  3612.                     /* check if prediction blocks A and C are available */

  3613.                     v->a_avail = v->c_avail = 0;

  3614.                     if (i == 2 || i == 3 || !s->first_slice_line)

  3615.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3616.                     if (i == 1 || i == 3 || s->mb_x)

  3617.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3618. 

  3619.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant,

  3620.                                            (i & 4) ? v->codingset2 : v->codingset);

  3621.                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3622.                         continue;

  3623.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3624.                     if (v->rangeredfrm)

  3625.                         for (j = 0; j < 64; j++)

  3626.                             s->block[i][j] <<= 1;

  3627.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off,

  3628.                                                      (i & 4) ? s->uvlinesize : s->linesize);

  3629.                     if (v->pq >= 9 && v->overlap) {

  3630.                         if (v->c_avail)

  3631.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3632.                         if (v->a_avail)

  3633.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  3634.                     }

  3635.                     block_cbp   |= 0xF << (i << 2);

  3636.                     block_intra |= 1 << i;

  3637.                 } else if (is_coded[i]) {

  3638.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3639.                                              first_block, s->dest[dst_idx] + off,

  3640.                                              (i & 4) ? s->uvlinesize : s->linesize,

  3641.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  3642.                                              &block_tt);

  3643.                     block_cbp |= pat << (i << 2);

  3644.                     if (!v->ttmbf && ttmb < 8)

  3645.                         ttmb = -1;

  3646.                     first_block = 0;

  3647.                 }

  3648.             }

  3649.         } else { // skipped MB

  3650.             s->mb_intra                               = 0;

  3651.             s->current_picture.f.qscale_table[mb_pos] = 0;

  3652.             for (i = 0; i < 6; i++) {

  3653.                 v->mb_type[0][s->block_index[i]] = 0;

  3654.                 s->dc_val[0][s->block_index[i]]  = 0;

  3655.             }

  3656.             for (i = 0; i < 4; i++) {

  3657.                 vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  3658.                 vc1_mc_4mv_luma(v, i, 0);

  3659.             }

  3660.             vc1_mc_4mv_chroma(v, 0);

  3661.             s->current_picture.f.qscale_table[mb_pos] = 0;

  3662.         }

  3663.     }

  3664. end:

  3665.     v->cbp[s->mb_x]      = block_cbp;

  3666.     v->ttblk[s->mb_x]    = block_tt;

  3667.     v->is_intra[s->mb_x] = block_intra;

  3668. 

  3669.     return 0;

  3670. }

  3671. 

  3672. /* Decode one macroblock in an interlaced frame p picture */

  3673. 

  3674. static int vc1_decode_p_mb_intfr(VC1Context *v)

  3675. {

  3676.     MpegEncContext *s = &v->s;

  3677.     GetBitContext *gb = &s->gb;

  3678.     int i;

  3679.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3680.     int cbp = 0; /* cbp decoding stuff */

  3681.     int mqdiff, mquant; /* MB quantization */

  3682.     int ttmb = v->ttfrm; /* MB Transform type */

  3683. 

  3684.     int mb_has_coeffs = 1; /* last_flag */

  3685.     int dmv_x, dmv_y; /* Differential MV components */

  3686.     int val; /* temp value */

  3687.     int first_block = 1;

  3688.     int dst_idx, off;

  3689.     int skipped, fourmv = 0, twomv = 0;

  3690.     int block_cbp = 0, pat, block_tt = 0;

  3691.     int idx_mbmode = 0, mvbp;

  3692.     int stride_y, fieldtx;

  3693. 

  3694.     mquant = v->pq; /* Loosy initialization */

  3695. 

  3696.     if (v->skip_is_raw)

  3697.         skipped = get_bits1(gb);

  3698.     else

  3699.         skipped = v->s.mbskip_table[mb_pos];

  3700.     if (!skipped) {

  3701.         if (v->fourmvswitch)

  3702.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done

  3703.         else

  3704.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line

  3705.         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {

  3706.         /* store the motion vector type in a flag (useful later) */

  3707.         case MV_PMODE_INTFR_4MV:

  3708.             fourmv = 1;

  3709.             v->blk_mv_type[s->block_index[0]] = 0;

  3710.             v->blk_mv_type[s->block_index[1]] = 0;

  3711.             v->blk_mv_type[s->block_index[2]] = 0;

  3712.             v->blk_mv_type[s->block_index[3]] = 0;

  3713.             break;

  3714.         case MV_PMODE_INTFR_4MV_FIELD:

  3715.             fourmv = 1;

  3716.             v->blk_mv_type[s->block_index[0]] = 1;

  3717.             v->blk_mv_type[s->block_index[1]] = 1;

  3718.             v->blk_mv_type[s->block_index[2]] = 1;

  3719.             v->blk_mv_type[s->block_index[3]] = 1;

  3720.             break;

  3721.         case MV_PMODE_INTFR_2MV_FIELD:

  3722.             twomv = 1;

  3723.             v->blk_mv_type[s->block_index[0]] = 1;

  3724.             v->blk_mv_type[s->block_index[1]] = 1;

  3725.             v->blk_mv_type[s->block_index[2]] = 1;

  3726.             v->blk_mv_type[s->block_index[3]] = 1;

  3727.             break;

  3728.         case MV_PMODE_INTFR_1MV:

  3729.             v->blk_mv_type[s->block_index[0]] = 0;

  3730.             v->blk_mv_type[s->block_index[1]] = 0;

  3731.             v->blk_mv_type[s->block_index[2]] = 0;

  3732.             v->blk_mv_type[s->block_index[3]] = 0;

  3733.             break;

  3734.         }

  3735.         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  3736.             s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;

  3737.             s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;

  3738.             s->current_picture.f.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  3739.             s->mb_intra = v->is_intra[s->mb_x] = 1;

  3740.             for (i = 0; i < 6; i++)

  3741.                 v->mb_type[0][s->block_index[i]] = 1;

  3742.             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  3743.             mb_has_coeffs = get_bits1(gb);

  3744.             if (mb_has_coeffs)

  3745.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3746.             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  3747.             GET_MQUANT();

  3748.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  3749.             /* Set DC scale - y and c use the same (not sure if necessary here) */

  3750.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3751.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3752.             dst_idx = 0;

  3753.             for (i = 0; i < 6; i++) {

  3754.                 s->dc_val[0][s->block_index[i]] = 0;

  3755.                 dst_idx += i >> 2;

  3756.                 val = ((cbp >> (5 - i)) & 1);

  3757.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3758.                 v->a_avail = v->c_avail = 0;

  3759.                 if (i == 2 || i == 3 || !s->first_slice_line)

  3760.                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3761.                 if (i == 1 || i == 3 || s->mb_x)

  3762.                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3763. 

  3764.                 vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3765.                                        (i & 4) ? v->codingset2 : v->codingset);

  3766.                 if ((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3767.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3768.                 if (i < 4) {

  3769.                     stride_y = s->linesize << fieldtx;

  3770.                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  3771.                 } else {

  3772.                     stride_y = s->uvlinesize;

  3773.                     off = 0;

  3774.                 }

  3775.                 s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, stride_y);

  3776.                 //TODO: loop filter

  3777.             }

  3778. 

  3779.         } else { // inter MB

  3780.             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];

  3781.             if (mb_has_coeffs)

  3782.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3783.             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  3784.                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  3785.             } else {

  3786.                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)

  3787.                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {

  3788.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  3789.                 }

  3790.             }

  3791.             s->mb_intra = v->is_intra[s->mb_x] = 0;

  3792.             for (i = 0; i < 6; i++)

  3793.                 v->mb_type[0][s->block_index[i]] = 0;

  3794.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];

  3795.             /* for all motion vector read MVDATA and motion compensate each block */

  3796.             dst_idx = 0;

  3797.             if (fourmv) {

  3798.                 mvbp = v->fourmvbp;

  3799.                 for (i = 0; i < 6; i++) {

  3800.                     if (i < 4) {

  3801.                         dmv_x = dmv_y = 0;

  3802.                         val   = ((mvbp >> (3 - i)) & 1);

  3803.                         if (val) {

  3804.                             get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3805.                         }

  3806.                         vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3807.                         vc1_mc_4mv_luma(v, i, 0);

  3808.                     } else if (i == 4) {

  3809.                         vc1_mc_4mv_chroma4(v);

  3810.                     }

  3811.                 }

  3812.             } else if (twomv) {

  3813.                 mvbp  = v->twomvbp;

  3814.                 dmv_x = dmv_y = 0;

  3815.                 if (mvbp & 2) {

  3816.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3817.                 }

  3818.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0]);

  3819.                 vc1_mc_4mv_luma(v, 0, 0);

  3820.                 vc1_mc_4mv_luma(v, 1, 0);

  3821.                 dmv_x = dmv_y = 0;

  3822.                 if (mvbp & 1) {

  3823.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3824.                 }

  3825.                 vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0]);

  3826.                 vc1_mc_4mv_luma(v, 2, 0);

  3827.                 vc1_mc_4mv_luma(v, 3, 0);

  3828.                 vc1_mc_4mv_chroma4(v);

  3829.             } else {

  3830.                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];

  3831.                 dmv_x = dmv_y = 0;

  3832.                 if (mvbp) {

  3833.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  3834.                 }

  3835.                 vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3836.                 vc1_mc_1mv(v, 0);

  3837.             }

  3838.             if (cbp)

  3839.                 GET_MQUANT();  // p. 227

  3840.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  3841.             if (!v->ttmbf && cbp)

  3842.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3843.             for (i = 0; i < 6; i++) {

  3844.                 s->dc_val[0][s->block_index[i]] = 0;

  3845.                 dst_idx += i >> 2;

  3846.                 val = ((cbp >> (5 - i)) & 1);

  3847.                 if (!fieldtx)

  3848.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3849.                 else

  3850.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  3851.                 if (val) {

  3852.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3853.                                              first_block, s->dest[dst_idx] + off,

  3854.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  3855.                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  3856.                     block_cbp |= pat << (i << 2);

  3857.                     if (!v->ttmbf && ttmb < 8)

  3858.                         ttmb = -1;

  3859.                     first_block = 0;

  3860.                 }

  3861.             }

  3862.         }

  3863.     } else { // skipped

  3864.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  3865.         for (i = 0; i < 6; i++) {

  3866.             v->mb_type[0][s->block_index[i]] = 0;

  3867.             s->dc_val[0][s->block_index[i]] = 0;

  3868.         }

  3869.         s->current_picture.f.mb_type[mb_pos]      = MB_TYPE_SKIP;

  3870.         s->current_picture.f.qscale_table[mb_pos] = 0;

  3871.         v->blk_mv_type[s->block_index[0]] = 0;

  3872.         v->blk_mv_type[s->block_index[1]] = 0;

  3873.         v->blk_mv_type[s->block_index[2]] = 0;

  3874.         v->blk_mv_type[s->block_index[3]] = 0;

  3875.         vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3876.         vc1_mc_1mv(v, 0);

  3877.     }

  3878.     if (s->mb_x == s->mb_width - 1)

  3879.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);

  3880.     return 0;

  3881. }

  3882. 

  3883. static int vc1_decode_p_mb_intfi(VC1Context *v)

  3884. {

  3885.     MpegEncContext *s = &v->s;

  3886.     GetBitContext *gb = &s->gb;

  3887.     int i;

  3888.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3889.     int cbp = 0; /* cbp decoding stuff */

  3890.     int mqdiff, mquant; /* MB quantization */

  3891.     int ttmb = v->ttfrm; /* MB Transform type */

  3892. 

  3893.     int mb_has_coeffs = 1; /* last_flag */

  3894.     int dmv_x, dmv_y; /* Differential MV components */

  3895.     int val; /* temp values */

  3896.     int first_block = 1;

  3897.     int dst_idx, off;

  3898.     int pred_flag;

  3899.     int block_cbp = 0, pat, block_tt = 0;

  3900.     int idx_mbmode = 0;

  3901. 

  3902.     mquant = v->pq; /* Loosy initialization */

  3903. 

  3904.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  3905.     if (idx_mbmode <= 1) { // intra MB

  3906.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  3907.         s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  3908.         s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  3909.         s->current_picture.f.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;

  3910.         GET_MQUANT();

  3911.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  3912.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  3913.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  3914.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  3915.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  3916.         mb_has_coeffs = idx_mbmode & 1;

  3917.         if (mb_has_coeffs)

  3918.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  3919.         dst_idx = 0;

  3920.         for (i = 0; i < 6; i++) {

  3921.             s->dc_val[0][s->block_index[i]]  = 0;

  3922.             v->mb_type[0][s->block_index[i]] = 1;

  3923.             dst_idx += i >> 2;

  3924.             val = ((cbp >> (5 - i)) & 1);

  3925.             v->a_avail = v->c_avail = 0;

  3926.             if (i == 2 || i == 3 || !s->first_slice_line)

  3927.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3928.             if (i == 1 || i == 3 || s->mb_x)

  3929.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3930. 

  3931.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  3932.                                    (i & 4) ? v->codingset2 : v->codingset);

  3933.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  3934.                 continue;

  3935.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  3936.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3937.             off += v->cur_field_type ? ((i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0]) : 0;

  3938.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  3939.             // TODO: loop filter

  3940.         }

  3941.     } else {

  3942.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  3943.         s->current_picture.f.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  3944.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  3945.         if (idx_mbmode <= 5) { // 1-MV

  3946.             dmv_x = dmv_y = pred_flag = 0;

  3947.             if (idx_mbmode & 1) {

  3948.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  3949.             }

  3950.             vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  3951.             vc1_mc_1mv(v, 0);

  3952.             mb_has_coeffs = !(idx_mbmode & 2);

  3953.         } else { // 4-MV

  3954.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  3955.             for (i = 0; i < 6; i++) {

  3956.                 if (i < 4) {

  3957.                     dmv_x = dmv_y = pred_flag = 0;

  3958.                     val   = ((v->fourmvbp >> (3 - i)) & 1);

  3959.                     if (val) {

  3960.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  3961.                     }

  3962.                     vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  3963.                     vc1_mc_4mv_luma(v, i, 0);

  3964.                 } else if (i == 4)

  3965.                     vc1_mc_4mv_chroma(v, 0);

  3966.             }

  3967.             mb_has_coeffs = idx_mbmode & 1;

  3968.         }

  3969.         if (mb_has_coeffs)

  3970.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3971.         if (cbp) {

  3972.             GET_MQUANT();

  3973.         }

  3974.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  3975.         if (!v->ttmbf && cbp) {

  3976.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3977.         }

  3978.         dst_idx = 0;

  3979.         for (i = 0; i < 6; i++) {

  3980.             s->dc_val[0][s->block_index[i]] = 0;

  3981.             dst_idx += i >> 2;

  3982.             val = ((cbp >> (5 - i)) & 1);

  3983.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  3984.             if (v->cur_field_type)

  3985.                 off += (i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0];

  3986.             if (val) {

  3987.                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  3988.                                          first_block, s->dest[dst_idx] + off,

  3989.                                          (i & 4) ? s->uvlinesize : s->linesize,

  3990.                                          (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  3991.                                          &block_tt);

  3992.                 block_cbp |= pat << (i << 2);

  3993.                 if (!v->ttmbf && ttmb < 8) ttmb = -1;

  3994.                 first_block = 0;

  3995.             }

  3996.         }

  3997.     }

  3998.     if (s->mb_x == s->mb_width - 1)

  3999.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4000.     return 0;

  4001. }

  4002. 

  4003. /** Decode one B-frame MB (in Main profile)

  4004.  */

  4005. static void vc1_decode_b_mb(VC1Context *v)

  4006. {

  4007.     MpegEncContext *s = &v->s;

  4008.     GetBitContext *gb = &s->gb;

  4009.     int i, j;

  4010.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4011.     int cbp = 0; /* cbp decoding stuff */

  4012.     int mqdiff, mquant; /* MB quantization */

  4013.     int ttmb = v->ttfrm; /* MB Transform type */

  4014.     int mb_has_coeffs = 0; /* last_flag */

  4015.     int index, index1; /* LUT indexes */

  4016.     int val, sign; /* temp values */

  4017.     int first_block = 1;

  4018.     int dst_idx, off;

  4019.     int skipped, direct;

  4020.     int dmv_x[2], dmv_y[2];

  4021.     int bmvtype = BMV_TYPE_BACKWARD;

  4022. 

  4023.     mquant      = v->pq; /* lossy initialization */

  4024.     s->mb_intra = 0;

  4025. 

  4026.     if (v->dmb_is_raw)

  4027.         direct = get_bits1(gb);

  4028.     else

  4029.         direct = v->direct_mb_plane[mb_pos];

  4030.     if (v->skip_is_raw)

  4031.         skipped = get_bits1(gb);

  4032.     else

  4033.         skipped = v->s.mbskip_table[mb_pos];

  4034. 

  4035.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4036.     for (i = 0; i < 6; i++) {

  4037.         v->mb_type[0][s->block_index[i]] = 0;

  4038.         s->dc_val[0][s->block_index[i]]  = 0;

  4039.     }

  4040.     s->current_picture.f.qscale_table[mb_pos] = 0;

  4041. 

  4042.     if (!direct) {

  4043.         if (!skipped) {

  4044.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  4045.             dmv_x[1] = dmv_x[0];

  4046.             dmv_y[1] = dmv_y[0];

  4047.         }

  4048.         if (skipped || !s->mb_intra) {

  4049.             bmvtype = decode012(gb);

  4050.             switch (bmvtype) {

  4051.             case 0:

  4052.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  4053.                 break;

  4054.             case 1:

  4055.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  4056.                 break;

  4057.             case 2:

  4058.                 bmvtype  = BMV_TYPE_INTERPOLATED;

  4059.                 dmv_x[0] = dmv_y[0] = 0;

  4060.             }

  4061.         }

  4062.     }

  4063.     for (i = 0; i < 6; i++)

  4064.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4065. 

  4066.     if (skipped) {

  4067.         if (direct)

  4068.             bmvtype = BMV_TYPE_INTERPOLATED;

  4069.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4070.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4071.         return;

  4072.     }

  4073.     if (direct) {

  4074.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4075.         GET_MQUANT();

  4076.         s->mb_intra = 0;

  4077.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  4078.         if (!v->ttmbf)

  4079.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4080.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  4081.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4082.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4083.     } else {

  4084.         if (!mb_has_coeffs && !s->mb_intra) {

  4085.             /* no coded blocks - effectively skipped */

  4086.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4087.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4088.             return;

  4089.         }

  4090.         if (s->mb_intra && !mb_has_coeffs) {

  4091.             GET_MQUANT();

  4092.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  4093.             s->ac_pred = get_bits1(gb);

  4094.             cbp = 0;

  4095.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4096.         } else {

  4097.             if (bmvtype == BMV_TYPE_INTERPOLATED) {

  4098.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  4099.                 if (!mb_has_coeffs) {

  4100.                     /* interpolated skipped block */

  4101.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4102.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4103.                     return;

  4104.                 }

  4105.             }

  4106.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  4107.             if (!s->mb_intra) {

  4108.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  4109.             }

  4110.             if (s->mb_intra)

  4111.                 s->ac_pred = get_bits1(gb);

  4112.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4113.             GET_MQUANT();

  4114.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  4115.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  4116.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4117.         }

  4118.     }

  4119.     dst_idx = 0;

  4120.     for (i = 0; i < 6; i++) {

  4121.         s->dc_val[0][s->block_index[i]] = 0;

  4122.         dst_idx += i >> 2;

  4123.         val = ((cbp >> (5 - i)) & 1);

  4124.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4125.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4126.         if (s->mb_intra) {

  4127.             /* check if prediction blocks A and C are available */

  4128.             v->a_avail = v->c_avail = 0;

  4129.             if (i == 2 || i == 3 || !s->first_slice_line)

  4130.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4131.             if (i == 1 || i == 3 || s->mb_x)

  4132.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4133. 

  4134.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4135.                                    (i & 4) ? v->codingset2 : v->codingset);

  4136.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4137.                 continue;

  4138.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4139.             if (v->rangeredfrm)

  4140.                 for (j = 0; j < 64; j++)

  4141.                     s->block[i][j] <<= 1;

  4142.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  4143.         } else if (val) {

  4144.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4145.                                first_block, s->dest[dst_idx] + off,

  4146.                                (i & 4) ? s->uvlinesize : s->linesize,

  4147.                                (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4148.             if (!v->ttmbf && ttmb < 8)

  4149.                 ttmb = -1;

  4150.             first_block = 0;

  4151.         }

  4152.     }

  4153. }

  4154. 

  4155. /** Decode one B-frame MB (in interlaced field B picture)

  4156.  */

  4157. static void vc1_decode_b_mb_intfi(VC1Context *v)

  4158. {

  4159.     MpegEncContext *s = &v->s;

  4160.     GetBitContext *gb = &s->gb;

  4161.     int i, j;

  4162.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4163.     int cbp = 0; /* cbp decoding stuff */

  4164.     int mqdiff, mquant; /* MB quantization */

  4165.     int ttmb = v->ttfrm; /* MB Transform type */

  4166.     int mb_has_coeffs = 0; /* last_flag */

  4167.     int val; /* temp value */

  4168.     int first_block = 1;

  4169.     int dst_idx, off;

  4170.     int fwd;

  4171.     int dmv_x[2], dmv_y[2], pred_flag[2];

  4172.     int bmvtype = BMV_TYPE_BACKWARD;

  4173.     int idx_mbmode, interpmvp;

  4174. 

  4175.     mquant      = v->pq; /* Loosy initialization */

  4176.     s->mb_intra = 0;

  4177. 

  4178.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  4179.     if (idx_mbmode <= 1) { // intra MB

  4180.         s->mb_intra = v->is_intra[s->mb_x] = 1;

  4181.         s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;

  4182.         s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;

  4183.         s->current_picture.f.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;

  4184.         GET_MQUANT();

  4185.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  4186.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  4187.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  4188.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  4189.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  4190.         mb_has_coeffs = idx_mbmode & 1;

  4191.         if (mb_has_coeffs)

  4192.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  4193.         dst_idx = 0;

  4194.         for (i = 0; i < 6; i++) {

  4195.             s->dc_val[0][s->block_index[i]] = 0;

  4196.             dst_idx += i >> 2;

  4197.             val = ((cbp >> (5 - i)) & 1);

  4198.             v->mb_type[0][s->block_index[i]] = s->mb_intra;

  4199.             v->a_avail                       = v->c_avail = 0;

  4200.             if (i == 2 || i == 3 || !s->first_slice_line)

  4201.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  4202.             if (i == 1 || i == 3 || s->mb_x)

  4203.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  4204. 

  4205.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  4206.                                    (i & 4) ? v->codingset2 : v->codingset);

  4207.             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))

  4208.                 continue;

  4209.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  4210.             if (v->rangeredfrm)

  4211.                 for (j = 0; j < 64; j++)

  4212.                     s->block[i][j] <<= 1;

  4213.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  4214.             off += v->cur_field_type ? ((i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0]) : 0;

  4215.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize);

  4216.             // TODO: yet to perform loop filter

  4217.         }

  4218.     } else {

  4219.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  4220.         s->current_picture.f.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  4221.         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;

  4222.         if (v->fmb_is_raw)

  4223.             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);

  4224.         else

  4225.             fwd = v->forward_mb_plane[mb_pos];

  4226.         if (idx_mbmode <= 5) { // 1-MV

  4227.             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  4228.             pred_flag[0] = pred_flag[1] = 0;

  4229.             if (fwd)

  4230.                 bmvtype = BMV_TYPE_FORWARD;

  4231.             else {

  4232.                 bmvtype = decode012(gb);

  4233.                 switch (bmvtype) {

  4234.                 case 0:

  4235.                     bmvtype = BMV_TYPE_BACKWARD;

  4236.                     break;

  4237.                 case 1:

  4238.                     bmvtype = BMV_TYPE_DIRECT;

  4239.                     break;

  4240.                 case 2:

  4241.                     bmvtype   = BMV_TYPE_INTERPOLATED;

  4242.                     interpmvp = get_bits1(gb);

  4243.                 }

  4244.             }

  4245.             v->bmvtype = bmvtype;

  4246.             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {

  4247.                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4248.             }

  4249.             if (bmvtype == BMV_TYPE_INTERPOLATED && interpmvp) {

  4250.                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);

  4251.             }

  4252.             if (bmvtype == BMV_TYPE_DIRECT) {

  4253.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4254.                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;

  4255.             }

  4256.             vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);

  4257.             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);

  4258.             mb_has_coeffs = !(idx_mbmode & 2);

  4259.         } else { // 4-MV

  4260.             if (fwd)

  4261.                 bmvtype = BMV_TYPE_FORWARD;

  4262.             v->bmvtype  = bmvtype;

  4263.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  4264.             for (i = 0; i < 6; i++) {

  4265.                 if (i < 4) {

  4266.                     dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  4267.                     dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;

  4268.                     val = ((v->fourmvbp >> (3 - i)) & 1);

  4269.                     if (val) {

  4270.                         get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],

  4271.                                                  &dmv_y[bmvtype == BMV_TYPE_BACKWARD],

  4272.                                              &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  4273.                     }

  4274.                     vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);

  4275.                     vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD);

  4276.                 } else if (i == 4)

  4277.                     vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);

  4278.             }

  4279.             mb_has_coeffs = idx_mbmode & 1;

  4280.         }

  4281.         if (mb_has_coeffs)

  4282.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  4283.         if (cbp) {

  4284.             GET_MQUANT();

  4285.         }

  4286.         s->current_picture.f.qscale_table[mb_pos] = mquant;

  4287.         if (!v->ttmbf && cbp) {

  4288.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  4289.         }

  4290.         dst_idx = 0;

  4291.         for (i = 0; i < 6; i++) {

  4292.             s->dc_val[0][s->block_index[i]] = 0;

  4293.             dst_idx += i >> 2;

  4294.             val = ((cbp >> (5 - i)) & 1);

  4295.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  4296.             if (v->cur_field_type)

  4297.                 off += (i & 4) ? s->current_picture_ptr->f.linesize[1] : s->current_picture_ptr->f.linesize[0];

  4298.             if (val) {

  4299.                 vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  4300.                                    first_block, s->dest[dst_idx] + off,

  4301.                                    (i & 4) ? s->uvlinesize : s->linesize,

  4302.                                    (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  4303.                 if (!v->ttmbf && ttmb < 8)

  4304.                     ttmb = -1;

  4305.                 first_block = 0;

  4306.             }

  4307.         }

  4308.     }

  4309. }

  4310. 

  4311. /** Decode blocks of I-frame

  4312.  */

  4313. static void vc1_decode_i_blocks(VC1Context *v)

  4314. {

  4315.     int k, j;

  4316.     MpegEncContext *s = &v->s;

  4317.     int cbp, val;

  4318.     uint8_t *coded_val;

  4319.     int mb_pos;

  4320. 

  4321.     /* select codingmode used for VLC tables selection */

  4322.     switch (v->y_ac_table_index) {

  4323.     case 0:

  4324.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4325.         break;

  4326.     case 1:

  4327.         v->codingset = CS_HIGH_MOT_INTRA;

  4328.         break;

  4329.     case 2:

  4330.         v->codingset = CS_MID_RATE_INTRA;

  4331.         break;

  4332.     }

  4333. 

  4334.     switch (v->c_ac_table_index) {

  4335.     case 0:

  4336.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4337.         break;

  4338.     case 1:

  4339.         v->codingset2 = CS_HIGH_MOT_INTER;

  4340.         break;

  4341.     case 2:

  4342.         v->codingset2 = CS_MID_RATE_INTER;

  4343.         break;

  4344.     }

  4345. 

  4346.     /* Set DC scale - y and c use the same */

  4347.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  4348.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  4349. 

  4350.     //do frame decode

  4351.     s->mb_x = s->mb_y = 0;

  4352.     s->mb_intra         = 1;

  4353.     s->first_slice_line = 1;

  4354.     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {

  4355.         s->mb_x = 0;

  4356.         ff_init_block_index(s);

  4357.         for (; s->mb_x < v->end_mb_x; s->mb_x++) {

  4358.             uint8_t *dst[6];

  4359.             ff_update_block_index(s);

  4360.             dst[0] = s->dest[0];

  4361.             dst[1] = dst[0] + 8;

  4362.             dst[2] = s->dest[0] + s->linesize * 8;

  4363.             dst[3] = dst[2] + 8;

  4364.             dst[4] = s->dest[1];

  4365.             dst[5] = s->dest[2];

  4366.             s->dsp.clear_blocks(s->block[0]);

  4367.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  4368.             s->current_picture.f.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  4369.             s->current_picture.f.qscale_table[mb_pos]                = v->pq;

  4370.             s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;

  4371.             s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;

  4372. 

  4373.             // do actual MB decoding and displaying

  4374.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4375.             v->s.ac_pred = get_bits1(&v->s.gb);

  4376. 

  4377.             for (k = 0; k < 6; k++) {

  4378.                 val = ((cbp >> (5 - k)) & 1);

  4379. 

  4380.                 if (k < 4) {

  4381.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4382.                     val        = val ^ pred;

  4383.                     *coded_val = val;

  4384.                 }

  4385.                 cbp |= val << (5 - k);

  4386. 

  4387.                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);

  4388. 

  4389.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4390.                     continue;

  4391.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);

  4392.                 if (v->pq >= 9 && v->overlap) {

  4393.                     if (v->rangeredfrm)

  4394.                         for (j = 0; j < 64; j++)

  4395.                             s->block[k][j] <<= 1;

  4396.                     s->dsp.put_signed_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4397.                 } else {

  4398.                     if (v->rangeredfrm)

  4399.                         for (j = 0; j < 64; j++)

  4400.                             s->block[k][j] = (s->block[k][j] - 64) << 1;

  4401.                     s->dsp.put_pixels_clamped(s->block[k], dst[k], k & 4 ? s->uvlinesize : s->linesize);

  4402.                 }

  4403.             }

  4404. 

  4405.             if (v->pq >= 9 && v->overlap) {

  4406.                 if (s->mb_x) {

  4407.                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);

  4408.                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4409.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4410.                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  4411.                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  4412.                     }

  4413.                 }

  4414.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  4415.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4416.                 if (!s->first_slice_line) {

  4417.                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);

  4418.                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  4419.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  4420.                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  4421.                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  4422.                     }

  4423.                 }

  4424.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  4425.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  4426.             }

  4427.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  4428. 

  4429.             if (get_bits_count(&s->gb) > v->bits) {

  4430.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);

  4431.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4432.                        get_bits_count(&s->gb), v->bits);

  4433.                 return;

  4434.             }

  4435.         }

  4436.         if (!v->s.loop_filter)

  4437.             ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4438.         else if (s->mb_y)

  4439.             ff_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4440. 

  4441.         s->first_slice_line = 0;

  4442.     }

  4443.     if (v->s.loop_filter)

  4444.         ff_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4445. 

  4446.     /* This is intentionally mb_height and not end_mb_y - unlike in advanced

  4447.      * profile, these only differ are when decoding MSS2 rectangles. */

  4448.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);

  4449. }

  4450. 

  4451. /** Decode blocks of I-frame for advanced profile

  4452.  */

  4453. static void vc1_decode_i_blocks_adv(VC1Context *v)

  4454. {

  4455.     int k;

  4456.     MpegEncContext *s = &v->s;

  4457.     int cbp, val;

  4458.     uint8_t *coded_val;

  4459.     int mb_pos;

  4460.     int mquant = v->pq;

  4461.     int mqdiff;

  4462.     GetBitContext *gb = &s->gb;

  4463. 

  4464.     /* select codingmode used for VLC tables selection */

  4465.     switch (v->y_ac_table_index) {

  4466.     case 0:

  4467.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4468.         break;

  4469.     case 1:

  4470.         v->codingset = CS_HIGH_MOT_INTRA;

  4471.         break;

  4472.     case 2:

  4473.         v->codingset = CS_MID_RATE_INTRA;

  4474.         break;

  4475.     }

  4476. 

  4477.     switch (v->c_ac_table_index) {

  4478.     case 0:

  4479.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4480.         break;

  4481.     case 1:

  4482.         v->codingset2 = CS_HIGH_MOT_INTER;

  4483.         break;

  4484.     case 2:

  4485.         v->codingset2 = CS_MID_RATE_INTER;

  4486.         break;

  4487.     }

  4488. 

  4489.     // do frame decode

  4490.     s->mb_x             = s->mb_y = 0;

  4491.     s->mb_intra         = 1;

  4492.     s->first_slice_line = 1;

  4493.     s->mb_y             = s->start_mb_y;

  4494.     if (s->start_mb_y) {

  4495.         s->mb_x = 0;

  4496.         ff_init_block_index(s);

  4497.         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,

  4498.                (1 + s->b8_stride) * sizeof(*s->coded_block));

  4499.     }

  4500.     for (; s->mb_y < s->end_mb_y; s->mb_y++) {

  4501.         s->mb_x = 0;

  4502.         ff_init_block_index(s);

  4503.         for (;s->mb_x < s->mb_width; s->mb_x++) {

  4504.             DCTELEM (*block)[64] = v->block[v->cur_blk_idx];

  4505.             ff_update_block_index(s);

  4506.             s->dsp.clear_blocks(block[0]);

  4507.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  4508.             s->current_picture.f.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;

  4509.             s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  4510.             s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  4511. 

  4512.             // do actual MB decoding and displaying

  4513.             if (v->fieldtx_is_raw)

  4514.                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);

  4515.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  4516.             if ( v->acpred_is_raw)

  4517.                 v->s.ac_pred = get_bits1(&v->s.gb);

  4518.             else

  4519.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  4520. 

  4521.             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)

  4522.                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);

  4523. 

  4524.             GET_MQUANT();

  4525. 

  4526.             s->current_picture.f.qscale_table[mb_pos] = mquant;

  4527.             /* Set DC scale - y and c use the same */

  4528.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  4529.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  4530. 

  4531.             for (k = 0; k < 6; k++) {

  4532.                 val = ((cbp >> (5 - k)) & 1);

  4533. 

  4534.                 if (k < 4) {

  4535.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  4536.                     val        = val ^ pred;

  4537.                     *coded_val = val;

  4538.                 }

  4539.                 cbp |= val << (5 - k);

  4540. 

  4541.                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);

  4542.                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);

  4543. 

  4544.                 vc1_decode_i_block_adv(v, block[k], k, val,

  4545.                                        (k < 4) ? v->codingset : v->codingset2, mquant);

  4546. 

  4547.                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))

  4548.                     continue;

  4549.                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);

  4550.             }

  4551. 

  4552.             vc1_smooth_overlap_filter_iblk(v);

  4553.             vc1_put_signed_blocks_clamped(v);

  4554.             if (v->s.loop_filter) vc1_loop_filter_iblk_delayed(v, v->pq);

  4555. 

  4556.             if (get_bits_count(&s->gb) > v->bits) {

  4557.                 // TODO: may need modification to handle slice coding

  4558.                 ff_er_add_slice(s, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4559.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  4560.                        get_bits_count(&s->gb), v->bits);

  4561.                 return;

  4562.             }

  4563.         }

  4564.         if (!v->s.loop_filter)

  4565.             ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4566.         else if (s->mb_y)

  4567.             ff_draw_horiz_band(s, (s->mb_y-1) * 16, 16);

  4568.         s->first_slice_line = 0;

  4569.     }

  4570. 

  4571.     /* raw bottom MB row */

  4572.     s->mb_x = 0;

  4573.     ff_init_block_index(s);

  4574.     for (;s->mb_x < s->mb_width; s->mb_x++) {

  4575.         ff_update_block_index(s);

  4576.         vc1_put_signed_blocks_clamped(v);

  4577.         if (v->s.loop_filter)

  4578.             vc1_loop_filter_iblk_delayed(v, v->pq);

  4579.     }

  4580.     if (v->s.loop_filter)

  4581.         ff_draw_horiz_band(s, (s->end_mb_y-1)*16, 16);

  4582.     ff_er_add_slice(s, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4583.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4584. }

  4585. 

  4586. static void vc1_decode_p_blocks(VC1Context *v)

  4587. {

  4588.     MpegEncContext *s = &v->s;

  4589.     int apply_loop_filter;

  4590. 

  4591.     /* select codingmode used for VLC tables selection */

  4592.     switch (v->c_ac_table_index) {

  4593.     case 0:

  4594.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4595.         break;

  4596.     case 1:

  4597.         v->codingset = CS_HIGH_MOT_INTRA;

  4598.         break;

  4599.     case 2:

  4600.         v->codingset = CS_MID_RATE_INTRA;

  4601.         break;

  4602.     }

  4603. 

  4604.     switch (v->c_ac_table_index) {

  4605.     case 0:

  4606.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4607.         break;

  4608.     case 1:

  4609.         v->codingset2 = CS_HIGH_MOT_INTER;

  4610.         break;

  4611.     case 2:

  4612.         v->codingset2 = CS_MID_RATE_INTER;

  4613.         break;

  4614.     }

  4615. 

  4616.     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY);

  4617.     s->first_slice_line = 1;

  4618.     memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);

  4619.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4620.         s->mb_x = 0;

  4621.         ff_init_block_index(s);

  4622.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4623.             ff_update_block_index(s);

  4624. 

  4625.             if (v->fcm == ILACE_FIELD)

  4626.                 vc1_decode_p_mb_intfi(v);

  4627.             else if (v->fcm == ILACE_FRAME)

  4628.                 vc1_decode_p_mb_intfr(v);

  4629.             else vc1_decode_p_mb(v);

  4630.             if (s->mb_y != s->start_mb_y && apply_loop_filter && v->fcm == PROGRESSIVE)

  4631.                 vc1_apply_p_loop_filter(v);

  4632.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4633.                 // TODO: may need modification to handle slice coding

  4634.                 ff_er_add_slice(s, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4635.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  4636.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  4637.                 return;

  4638.             }

  4639.         }

  4640.         memmove(v->cbp_base,      v->cbp,      sizeof(v->cbp_base[0])      * s->mb_stride);

  4641.         memmove(v->ttblk_base,    v->ttblk,    sizeof(v->ttblk_base[0])    * s->mb_stride);

  4642.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  4643.         memmove(v->luma_mv_base,  v->luma_mv,  sizeof(v->luma_mv_base[0])  * s->mb_stride);

  4644.         if (s->mb_y != s->start_mb_y) ff_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4645.         s->first_slice_line = 0;

  4646.     }

  4647.     if (apply_loop_filter) {

  4648.         s->mb_x = 0;

  4649.         ff_init_block_index(s);

  4650.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4651.             ff_update_block_index(s);

  4652.             vc1_apply_p_loop_filter(v);

  4653.         }

  4654.     }

  4655.     if (s->end_mb_y >= s->start_mb_y)

  4656.         ff_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4657.     ff_er_add_slice(s, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4658.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4659. }

  4660. 

  4661. static void vc1_decode_b_blocks(VC1Context *v)

  4662. {

  4663.     MpegEncContext *s = &v->s;

  4664. 

  4665.     /* select codingmode used for VLC tables selection */

  4666.     switch (v->c_ac_table_index) {

  4667.     case 0:

  4668.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  4669.         break;

  4670.     case 1:

  4671.         v->codingset = CS_HIGH_MOT_INTRA;

  4672.         break;

  4673.     case 2:

  4674.         v->codingset = CS_MID_RATE_INTRA;

  4675.         break;

  4676.     }

  4677. 

  4678.     switch (v->c_ac_table_index) {

  4679.     case 0:

  4680.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  4681.         break;

  4682.     case 1:

  4683.         v->codingset2 = CS_HIGH_MOT_INTER;

  4684.         break;

  4685.     case 2:

  4686.         v->codingset2 = CS_MID_RATE_INTER;

  4687.         break;

  4688.     }

  4689. 

  4690.     s->first_slice_line = 1;

  4691.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4692.         s->mb_x = 0;

  4693.         ff_init_block_index(s);

  4694.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  4695.             ff_update_block_index(s);

  4696. 

  4697.             if (v->fcm == ILACE_FIELD)

  4698.                 vc1_decode_b_mb_intfi(v);

  4699.             else

  4700.                 vc1_decode_b_mb(v);

  4701.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  4702.                 // TODO: may need modification to handle slice coding

  4703.                 ff_er_add_slice(s, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  4704.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  4705.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  4706.                 return;

  4707.             }

  4708.             if (v->s.loop_filter) vc1_loop_filter_iblk(v, v->pq);

  4709.         }

  4710.         if (!v->s.loop_filter)

  4711.             ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4712.         else if (s->mb_y)

  4713.             ff_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  4714.         s->first_slice_line = 0;

  4715.     }

  4716.     if (v->s.loop_filter)

  4717.         ff_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  4718.     ff_er_add_slice(s, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  4719.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  4720. }

  4721. 

  4722. static void vc1_decode_skip_blocks(VC1Context *v)

  4723. {

  4724.     MpegEncContext *s = &v->s;

  4725. 

  4726.     ff_er_add_slice(s, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);

  4727.     s->first_slice_line = 1;

  4728.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  4729.         s->mb_x = 0;

  4730.         ff_init_block_index(s);

  4731.         ff_update_block_index(s);

  4732.         memcpy(s->dest[0], s->last_picture.f.data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);

  4733.         memcpy(s->dest[1], s->last_picture.f.data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  4734.         memcpy(s->dest[2], s->last_picture.f.data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  4735.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  4736.         s->first_slice_line = 0;

  4737.     }

  4738.     s->pict_type = AV_PICTURE_TYPE_P;

  4739. }

  4740. 

  4741. void ff_vc1_decode_blocks(VC1Context *v)

  4742. {

  4743. 

  4744.     v->s.esc3_level_length = 0;

  4745.     if (v->x8_type) {

  4746.         ff_intrax8_decode_picture(&v->x8, 2*v->pq + v->halfpq, v->pq * !v->pquantizer);

  4747.     } else {

  4748.         v->cur_blk_idx     =  0;

  4749.         v->left_blk_idx    = -1;

  4750.         v->topleft_blk_idx =  1;

  4751.         v->top_blk_idx     =  2;

  4752.         switch (v->s.pict_type) {

  4753.         case AV_PICTURE_TYPE_I:

  4754.             if (v->profile == PROFILE_ADVANCED)

  4755.                 vc1_decode_i_blocks_adv(v);

  4756.             else

  4757.                 vc1_decode_i_blocks(v);

  4758.             break;

  4759.         case AV_PICTURE_TYPE_P:

  4760.             if (v->p_frame_skipped)

  4761.                 vc1_decode_skip_blocks(v);

  4762.             else

  4763.                 vc1_decode_p_blocks(v);

  4764.             break;

  4765.         case AV_PICTURE_TYPE_B:

  4766.             if (v->bi_type) {

  4767.                 if (v->profile == PROFILE_ADVANCED)

  4768.                     vc1_decode_i_blocks_adv(v);

  4769.                 else

  4770.                     vc1_decode_i_blocks(v);

  4771.             } else

  4772.                 vc1_decode_b_blocks(v);

  4773.             break;

  4774.         }

  4775.     }

  4776. }

  4777. 

  4778. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  4779. 

  4780. typedef struct {

  4781.     /**

  4782.      * Transform coefficients for both sprites in 16.16 fixed point format,

  4783.      * in the order they appear in the bitstream:

  4784.      *  x scale

  4785.      *  rotation 1 (unused)

  4786.      *  x offset

  4787.      *  rotation 2 (unused)

  4788.      *  y scale

  4789.      *  y offset

  4790.      *  alpha

  4791.      */

  4792.     int coefs[2][7];

  4793. 

  4794.     int effect_type, effect_flag;

  4795.     int effect_pcount1, effect_pcount2;   ///< amount of effect parameters stored in effect_params

  4796.     int effect_params1[15], effect_params2[10]; ///< effect parameters in 16.16 fixed point format

  4797. } SpriteData;

  4798. 

  4799. static inline int get_fp_val(GetBitContext* gb)

  4800. {

  4801.     return (get_bits_long(gb, 30) - (1 << 29)) << 1;

  4802. }

  4803. 

  4804. static void vc1_sprite_parse_transform(GetBitContext* gb, int c[7])

  4805. {

  4806.     c[1] = c[3] = 0;

  4807. 

  4808.     switch (get_bits(gb, 2)) {

  4809.     case 0:

  4810.         c[0] = 1 << 16;

  4811.         c[2] = get_fp_val(gb);

  4812.         c[4] = 1 << 16;

  4813.         break;

  4814.     case 1:

  4815.         c[0] = c[4] = get_fp_val(gb);

  4816.         c[2] = get_fp_val(gb);

  4817.         break;

  4818.     case 2:

  4819.         c[0] = get_fp_val(gb);

  4820.         c[2] = get_fp_val(gb);

  4821.         c[4] = get_fp_val(gb);

  4822.         break;

  4823.     case 3:

  4824.         c[0] = get_fp_val(gb);

  4825.         c[1] = get_fp_val(gb);

  4826.         c[2] = get_fp_val(gb);

  4827.         c[3] = get_fp_val(gb);

  4828.         c[4] = get_fp_val(gb);

  4829.         break;

  4830.     }

  4831.     c[5] = get_fp_val(gb);

  4832.     if (get_bits1(gb))

  4833.         c[6] = get_fp_val(gb);

  4834.     else

  4835.         c[6] = 1 << 16;

  4836. }

  4837. 

  4838. static void vc1_parse_sprites(VC1Context *v, GetBitContext* gb, SpriteData* sd)

  4839. {

  4840.     AVCodecContext *avctx = v->s.avctx;

  4841.     int sprite, i;

  4842. 

  4843.     for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  4844.         vc1_sprite_parse_transform(gb, sd->coefs[sprite]);

  4845.         if (sd->coefs[sprite][1] || sd->coefs[sprite][3])

  4846.             av_log_ask_for_sample(avctx, "Rotation coefficients are not zero");

  4847.         av_log(avctx, AV_LOG_DEBUG, sprite ? "S2:" : "S1:");

  4848.         for (i = 0; i < 7; i++)

  4849.             av_log(avctx, AV_LOG_DEBUG, " %d.%.3d",

  4850.                    sd->coefs[sprite][i] / (1<<16),

  4851.                    (abs(sd->coefs[sprite][i]) & 0xFFFF) * 1000 / (1 << 16));

  4852.         av_log(avctx, AV_LOG_DEBUG, "\n");

  4853.     }

  4854. 

  4855.     skip_bits(gb, 2);

  4856.     if (sd->effect_type = get_bits_long(gb, 30)) {

  4857.         switch (sd->effect_pcount1 = get_bits(gb, 4)) {

  4858.         case 7:

  4859.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  4860.             break;

  4861.         case 14:

  4862.             vc1_sprite_parse_transform(gb, sd->effect_params1);

  4863.             vc1_sprite_parse_transform(gb, sd->effect_params1 + 7);

  4864.             break;

  4865.         default:

  4866.             for (i = 0; i < sd->effect_pcount1; i++)

  4867.                 sd->effect_params1[i] = get_fp_val(gb);

  4868.         }

  4869.         if (sd->effect_type != 13 || sd->effect_params1[0] != sd->coefs[0][6]) {

  4870.             // effect 13 is simple alpha blending and matches the opacity above

  4871.             av_log(avctx, AV_LOG_DEBUG, "Effect: %d; params: ", sd->effect_type);

  4872.             for (i = 0; i < sd->effect_pcount1; i++)

  4873.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  4874.                        sd->effect_params1[i] / (1 << 16),

  4875.                        (abs(sd->effect_params1[i]) & 0xFFFF) * 1000 / (1 << 16));

  4876.             av_log(avctx, AV_LOG_DEBUG, "\n");

  4877.         }

  4878. 

  4879.         sd->effect_pcount2 = get_bits(gb, 16);

  4880.         if (sd->effect_pcount2 > 10) {

  4881.             av_log(avctx, AV_LOG_ERROR, "Too many effect parameters\n");

  4882.             return;

  4883.         } else if (sd->effect_pcount2) {

  4884.             i = -1;

  4885.             av_log(avctx, AV_LOG_DEBUG, "Effect params 2: ");

  4886.             while (++i < sd->effect_pcount2) {

  4887.                 sd->effect_params2[i] = get_fp_val(gb);

  4888.                 av_log(avctx, AV_LOG_DEBUG, " %d.%.2d",

  4889.                        sd->effect_params2[i] / (1 << 16),

  4890.                        (abs(sd->effect_params2[i]) & 0xFFFF) * 1000 / (1 << 16));

  4891.             }

  4892.             av_log(avctx, AV_LOG_DEBUG, "\n");

  4893.         }

  4894.     }

  4895.     if (sd->effect_flag = get_bits1(gb))

  4896.         av_log(avctx, AV_LOG_DEBUG, "Effect flag set\n");

  4897. 

  4898.     if (get_bits_count(gb) >= gb->size_in_bits +

  4899.        (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE ? 64 : 0))

  4900.         av_log(avctx, AV_LOG_ERROR, "Buffer overrun\n");

  4901.     if (get_bits_count(gb) < gb->size_in_bits - 8)

  4902.         av_log(avctx, AV_LOG_WARNING, "Buffer not fully read\n");

  4903. }

  4904. 

  4905. static void vc1_draw_sprites(VC1Context *v, SpriteData* sd)

  4906. {

  4907.     int i, plane, row, sprite;

  4908.     int sr_cache[2][2] = { { -1, -1 }, { -1, -1 } };

  4909.     uint8_t* src_h[2][2];

  4910.     int xoff[2], xadv[2], yoff[2], yadv[2], alpha;

  4911.     int ysub[2];

  4912.     MpegEncContext *s = &v->s;

  4913. 

  4914.     for (i = 0; i < 2; i++) {

  4915.         xoff[i] = av_clip(sd->coefs[i][2], 0, v->sprite_width-1 << 16);

  4916.         xadv[i] = sd->coefs[i][0];

  4917.         if (xadv[i] != 1<<16 || (v->sprite_width << 16) - (v->output_width << 16) - xoff[i])

  4918.             xadv[i] = av_clip(xadv[i], 0, ((v->sprite_width<<16) - xoff[i] - 1) / v->output_width);

  4919. 

  4920.         yoff[i] = av_clip(sd->coefs[i][5], 0, v->sprite_height-1 << 16);

  4921.         yadv[i] = av_clip(sd->coefs[i][4], 0, ((v->sprite_height << 16) - yoff[i]) / v->output_height);

  4922.     }

  4923.     alpha = av_clip(sd->coefs[1][6], 0, (1<<16) - 1);

  4924. 

  4925.     for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++) {

  4926.         int width = v->output_width>>!!plane;

  4927. 

  4928.         for (row = 0; row < v->output_height>>!!plane; row++) {

  4929.             uint8_t *dst = v->sprite_output_frame.data[plane] +

  4930.                            v->sprite_output_frame.linesize[plane] * row;

  4931. 

  4932.             for (sprite = 0; sprite <= v->two_sprites; sprite++) {

  4933.                 uint8_t *iplane = s->current_picture.f.data[plane];

  4934.                 int      iline  = s->current_picture.f.linesize[plane];

  4935.                 int      ycoord = yoff[sprite] + yadv[sprite] * row;

  4936.                 int      yline  = ycoord >> 16;

  4937.                 int      next_line;

  4938.                 ysub[sprite] = ycoord & 0xFFFF;

  4939.                 if (sprite) {

  4940.                     iplane = s->last_picture.f.data[plane];

  4941.                     iline  = s->last_picture.f.linesize[plane];

  4942.                 }

  4943.                 next_line = FFMIN(yline + 1, (v->sprite_height >> !!plane) - 1) * iline;

  4944.                 if (!(xoff[sprite] & 0xFFFF) && xadv[sprite] == 1 << 16) {

  4945.                         src_h[sprite][0] = iplane + (xoff[sprite] >> 16) +  yline      * iline;

  4946.                     if (ysub[sprite])

  4947.                         src_h[sprite][1] = iplane + (xoff[sprite] >> 16) + next_line;

  4948.                 } else {

  4949.                     if (sr_cache[sprite][0] != yline) {

  4950.                         if (sr_cache[sprite][1] == yline) {

  4951.                             FFSWAP(uint8_t*, v->sr_rows[sprite][0], v->sr_rows[sprite][1]);

  4952.                             FFSWAP(int,        sr_cache[sprite][0],   sr_cache[sprite][1]);

  4953.                         } else {

  4954.                             v->vc1dsp.sprite_h(v->sr_rows[sprite][0], iplane + yline * iline, xoff[sprite], xadv[sprite], width);

  4955.                             sr_cache[sprite][0] = yline;

  4956.                         }

  4957.                     }

  4958.                     if (ysub[sprite] && sr_cache[sprite][1] != yline + 1) {

  4959.                         v->vc1dsp.sprite_h(v->sr_rows[sprite][1],

  4960.                                            iplane + next_line, xoff[sprite],

  4961.                                            xadv[sprite], width);

  4962.                         sr_cache[sprite][1] = yline + 1;

  4963.                     }

  4964.                     src_h[sprite][0] = v->sr_rows[sprite][0];

  4965.                     src_h[sprite][1] = v->sr_rows[sprite][1];

  4966.                 }

  4967.             }

  4968. 

  4969.             if (!v->two_sprites) {

  4970.                 if (ysub[0]) {

  4971.                     v->vc1dsp.sprite_v_single(dst, src_h[0][0], src_h[0][1], ysub[0], width);

  4972.                 } else {

  4973.                     memcpy(dst, src_h[0][0], width);

  4974.                 }

  4975.             } else {

  4976.                 if (ysub[0] && ysub[1]) {

  4977.                     v->vc1dsp.sprite_v_double_twoscale(dst, src_h[0][0], src_h[0][1], ysub[0],

  4978.                                                        src_h[1][0], src_h[1][1], ysub[1], alpha, width);

  4979.                 } else if (ysub[0]) {

  4980.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[0][0], src_h[0][1], ysub[0],

  4981.                                                        src_h[1][0], alpha, width);

  4982.                 } else if (ysub[1]) {

  4983.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[1][0], src_h[1][1], ysub[1],

  4984.                                                        src_h[0][0], (1<<16)-1-alpha, width);

  4985.                 } else {

  4986.                     v->vc1dsp.sprite_v_double_noscale(dst, src_h[0][0], src_h[1][0], alpha, width);

  4987.                 }

  4988.             }

  4989.         }

  4990. 

  4991.         if (!plane) {

  4992.             for (i = 0; i < 2; i++) {

  4993.                 xoff[i] >>= 1;

  4994.                 yoff[i] >>= 1;

  4995.             }

  4996.         }

  4997. 

  4998.     }

  4999. }

  5000. 

  5001. 

  5002. static int vc1_decode_sprites(VC1Context *v, GetBitContext* gb)

  5003. {

  5004.     MpegEncContext *s     = &v->s;

  5005.     AVCodecContext *avctx = s->avctx;

  5006.     SpriteData sd;

  5007. 

  5008.     vc1_parse_sprites(v, gb, &sd);

  5009. 

  5010.     if (!s->current_picture.f.data[0]) {

  5011.         av_log(avctx, AV_LOG_ERROR, "Got no sprites\n");

  5012.         return -1;

  5013.     }

  5014. 

  5015.     if (v->two_sprites && (!s->last_picture_ptr || !s->last_picture.f.data[0])) {

  5016.         av_log(avctx, AV_LOG_WARNING, "Need two sprites, only got one\n");

  5017.         v->two_sprites = 0;

  5018.     }

  5019. 

  5020.     if (v->sprite_output_frame.data[0])

  5021.         avctx->release_buffer(avctx, &v->sprite_output_frame);

  5022. 

  5023.     v->sprite_output_frame.buffer_hints = FF_BUFFER_HINTS_VALID;

  5024.     v->sprite_output_frame.reference = 0;

  5025.     if (avctx->get_buffer(avctx, &v->sprite_output_frame) < 0) {

  5026.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  5027.         return -1;

  5028.     }

  5029. 

  5030.     vc1_draw_sprites(v, &sd);

  5031. 

  5032.     return 0;

  5033. }

  5034. 

  5035. static void vc1_sprite_flush(AVCodecContext *avctx)

  5036. {

  5037.     VC1Context *v     = avctx->priv_data;

  5038.     MpegEncContext *s = &v->s;

  5039.     AVFrame *f = &s->current_picture.f;

  5040.     int plane, i;

  5041. 

  5042.     /* Windows Media Image codecs have a convergence interval of two keyframes.

  5043.        Since we can't enforce it, clear to black the missing sprite. This is

  5044.        wrong but it looks better than doing nothing. */

  5045. 

  5046.     if (f->data[0])

  5047.         for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++)

  5048.             for (i = 0; i < v->sprite_height>>!!plane; i++)

  5049.                 memset(f->data[plane] + i * f->linesize[plane],

  5050.                        plane ? 128 : 0, f->linesize[plane]);

  5051. }

  5052. 

  5053. #endif

  5054. 

  5055. av_cold int ff_vc1_decode_init_alloc_tables(VC1Context *v)

  5056. {

  5057.     MpegEncContext *s = &v->s;

  5058.     int i;

  5059. 

  5060.     /* Allocate mb bitplanes */

  5061.     v->mv_type_mb_plane = av_malloc (s->mb_stride * s->mb_height);

  5062.     v->direct_mb_plane  = av_malloc (s->mb_stride * s->mb_height);

  5063.     v->forward_mb_plane = av_malloc (s->mb_stride * s->mb_height);

  5064.     v->fieldtx_plane    = av_mallocz(s->mb_stride * s->mb_height);

  5065.     v->acpred_plane     = av_malloc (s->mb_stride * s->mb_height);

  5066.     v->over_flags_plane = av_malloc (s->mb_stride * s->mb_height);

  5067. 

  5068.     v->n_allocated_blks = s->mb_width + 2;

  5069.     v->block            = av_malloc(sizeof(*v->block) * v->n_allocated_blks);

  5070.     v->cbp_base         = av_malloc(sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  5071.     v->cbp              = v->cbp_base + s->mb_stride;

  5072.     v->ttblk_base       = av_malloc(sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  5073.     v->ttblk            = v->ttblk_base + s->mb_stride;

  5074.     v->is_intra_base    = av_mallocz(sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  5075.     v->is_intra         = v->is_intra_base + s->mb_stride;

  5076.     v->luma_mv_base     = av_malloc(sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);

  5077.     v->luma_mv          = v->luma_mv_base + s->mb_stride;

  5078. 

  5079.     /* allocate block type info in that way so it could be used with s->block_index[] */

  5080.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5081.     v->mb_type[0]   = v->mb_type_base + s->b8_stride + 1;

  5082.     v->mb_type[1]   = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  5083.     v->mb_type[2]   = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  5084. 

  5085.     /* allocate memory to store block level MV info */

  5086.     v->blk_mv_type_base = av_mallocz(     s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5087.     v->blk_mv_type      = v->blk_mv_type_base + s->b8_stride + 1;

  5088.     v->mv_f_base        = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5089.     v->mv_f[0]          = v->mv_f_base + s->b8_stride + 1;

  5090.     v->mv_f[1]          = v->mv_f[0] + (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  5091.     v->mv_f_last_base   = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5092.     v->mv_f_last[0]     = v->mv_f_last_base + s->b8_stride + 1;

  5093.     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);

  5094.     v->mv_f_next_base   = av_mallocz(2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5095.     v->mv_f_next[0]     = v->mv_f_next_base + s->b8_stride + 1;

  5096.     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);

  5097. 

  5098.     /* Init coded blocks info */

  5099.     if (v->profile == PROFILE_ADVANCED) {

  5100. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  5101. //            return -1;

  5102. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  5103. //            return -1;

  5104.     }

  5105. 

  5106.     ff_intrax8_common_init(&v->x8,s);

  5107. 

  5108.     if (s->avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || s->avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5109.         for (i = 0; i < 4; i++)

  5110.             if (!(v->sr_rows[i >> 1][i & 1] = av_malloc(v->output_width))) return -1;

  5111.     }

  5112. 

  5113.     if (!v->mv_type_mb_plane || !v->direct_mb_plane || !v->acpred_plane || !v->over_flags_plane ||

  5114.         !v->block || !v->cbp_base || !v->ttblk_base || !v->is_intra_base || !v->luma_mv_base ||

  5115.         !v->mb_type_base)

  5116.             return -1;

  5117. 

  5118.     return 0;

  5119. }

  5120. 

  5121. av_cold void ff_vc1_init_transposed_scantables(VC1Context *v)

  5122. {

  5123.     int i;

  5124.     for (i = 0; i < 64; i++) {

  5125. #define transpose(x) ((x >> 3) | ((x & 7) << 3))

  5126.         v->zz_8x8[0][i] = transpose(ff_wmv1_scantable[0][i]);

  5127.         v->zz_8x8[1][i] = transpose(ff_wmv1_scantable[1][i]);

  5128.         v->zz_8x8[2][i] = transpose(ff_wmv1_scantable[2][i]);

  5129.         v->zz_8x8[3][i] = transpose(ff_wmv1_scantable[3][i]);

  5130.         v->zzi_8x8[i]   = transpose(ff_vc1_adv_interlaced_8x8_zz[i]);

  5131.     }

  5132.     v->left_blk_sh = 0;

  5133.     v->top_blk_sh  = 3;

  5134. }

  5135. 

  5136. /** Initialize a VC1/WMV3 decoder

  5137.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5138.  * @todo TODO: Decypher remaining bits in extra_data

  5139.  */

  5140. static av_cold int vc1_decode_init(AVCodecContext *avctx)

  5141. {

  5142.     VC1Context *v = avctx->priv_data;

  5143.     MpegEncContext *s = &v->s;

  5144.     GetBitContext gb;

  5145. 

  5146.     /* save the container output size for WMImage */

  5147.     v->output_width  = avctx->width;

  5148.     v->output_height = avctx->height;

  5149. 

  5150.     if (!avctx->extradata_size || !avctx->extradata)

  5151.         return -1;

  5152.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  5153.         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);

  5154.     else

  5155.         avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  5156.     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);

  5157.     v->s.avctx = avctx;

  5158.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  5159.     v->s.flags   |= CODEC_FLAG_EMU_EDGE;

  5160. 

  5161.     if (avctx->idct_algo == FF_IDCT_AUTO) {

  5162.         avctx->idct_algo = FF_IDCT_WMV2;

  5163.     }

  5164. 

  5165.     if (ff_vc1_init_common(v) < 0)

  5166.         return -1;

  5167.     ff_vc1dsp_init(&v->vc1dsp);

  5168. 

  5169.     if (avctx->codec_id == AV_CODEC_ID_WMV3 || avctx->codec_id == AV_CODEC_ID_WMV3IMAGE) {

  5170.         int count = 0;

  5171. 

  5172.         // looks like WMV3 has a sequence header stored in the extradata

  5173.         // advanced sequence header may be before the first frame

  5174.         // the last byte of the extradata is a version number, 1 for the

  5175.         // samples we can decode

  5176. 

  5177.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  5178. 

  5179.         if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0)

  5180.           return -1;

  5181. 

  5182.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  5183.         if (count > 0) {

  5184.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  5185.                    count, get_bits(&gb, count));

  5186.         } else if (count < 0) {

  5187.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  5188.         }

  5189.     } else { // VC1/WVC1/WVP2

  5190.         const uint8_t *start = avctx->extradata;

  5191.         uint8_t *end = avctx->extradata + avctx->extradata_size;

  5192.         const uint8_t *next;

  5193.         int size, buf2_size;

  5194.         uint8_t *buf2 = NULL;

  5195.         int seq_initialized = 0, ep_initialized = 0;

  5196. 

  5197.         if (avctx->extradata_size < 16) {

  5198.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  5199.             return -1;

  5200.         }

  5201. 

  5202.         buf2  = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5203.         start = find_next_marker(start, end); // in WVC1 extradata first byte is its size, but can be 0 in mkv

  5204.         next  = start;

  5205.         for (; next < end; start = next) {

  5206.             next = find_next_marker(start + 4, end);

  5207.             size = next - start - 4;

  5208.             if (size <= 0)

  5209.                 continue;

  5210.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  5211.             init_get_bits(&gb, buf2, buf2_size * 8);

  5212.             switch (AV_RB32(start)) {

  5213.             case VC1_CODE_SEQHDR:

  5214.                 if (ff_vc1_decode_sequence_header(avctx, v, &gb) < 0) {

  5215.                     av_free(buf2);

  5216.                     return -1;

  5217.                 }

  5218.                 seq_initialized = 1;

  5219.                 break;

  5220.             case VC1_CODE_ENTRYPOINT:

  5221.                 if (ff_vc1_decode_entry_point(avctx, v, &gb) < 0) {

  5222.                     av_free(buf2);

  5223.                     return -1;

  5224.                 }

  5225.                 ep_initialized = 1;

  5226.                 break;

  5227.             }

  5228.         }

  5229.         av_free(buf2);

  5230.         if (!seq_initialized || !ep_initialized) {

  5231.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  5232.             return -1;

  5233.         }

  5234.         v->res_sprite = (avctx->codec_tag == MKTAG('W','V','P','2'));

  5235.     }

  5236. 

  5237.     avctx->profile = v->profile;

  5238.     if (v->profile == PROFILE_ADVANCED)

  5239.         avctx->level = v->level;

  5240. 

  5241.     avctx->has_b_frames = !!avctx->max_b_frames;

  5242. 

  5243.     s->mb_width  = (avctx->coded_width  + 15) >> 4;

  5244.     s->mb_height = (avctx->coded_height + 15) >> 4;

  5245. 

  5246.     if (v->profile == PROFILE_ADVANCED || v->res_fasttx) {

  5247.         ff_vc1_init_transposed_scantables(v);

  5248.     } else {

  5249.         memcpy(v->zz_8x8, ff_wmv1_scantable, 4*64);

  5250.         v->left_blk_sh = 3;

  5251.         v->top_blk_sh  = 0;

  5252.     }

  5253. 

  5254.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5255.         v->sprite_width  = avctx->coded_width;

  5256.         v->sprite_height = avctx->coded_height;

  5257. 

  5258.         avctx->coded_width  = avctx->width  = v->output_width;

  5259.         avctx->coded_height = avctx->height = v->output_height;

  5260. 

  5261.         // prevent 16.16 overflows

  5262.         if (v->sprite_width  > 1 << 14 ||

  5263.             v->sprite_height > 1 << 14 ||

  5264.             v->output_width  > 1 << 14 ||

  5265.             v->output_height > 1 << 14) return -1;

  5266.     }

  5267.     return 0;

  5268. }

  5269. 

  5270. /** Close a VC1/WMV3 decoder

  5271.  * @warning Initial try at using MpegEncContext stuff

  5272.  */

  5273. av_cold int ff_vc1_decode_end(AVCodecContext *avctx)

  5274. {

  5275.     VC1Context *v = avctx->priv_data;

  5276.     int i;

  5277. 

  5278.     if ((avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE)

  5279.         && v->sprite_output_frame.data[0])

  5280.         avctx->release_buffer(avctx, &v->sprite_output_frame);

  5281.     for (i = 0; i < 4; i++)

  5282.         av_freep(&v->sr_rows[i >> 1][i & 1]);

  5283.     av_freep(&v->hrd_rate);

  5284.     av_freep(&v->hrd_buffer);

  5285.     ff_MPV_common_end(&v->s);

  5286.     av_freep(&v->mv_type_mb_plane);

  5287.     av_freep(&v->direct_mb_plane);

  5288.     av_freep(&v->forward_mb_plane);

  5289.     av_freep(&v->fieldtx_plane);

  5290.     av_freep(&v->acpred_plane);

  5291.     av_freep(&v->over_flags_plane);

  5292.     av_freep(&v->mb_type_base);

  5293.     av_freep(&v->blk_mv_type_base);

  5294.     av_freep(&v->mv_f_base);

  5295.     av_freep(&v->mv_f_last_base);

  5296.     av_freep(&v->mv_f_next_base);

  5297.     av_freep(&v->block);

  5298.     av_freep(&v->cbp_base);

  5299.     av_freep(&v->ttblk_base);

  5300.     av_freep(&v->is_intra_base); // FIXME use v->mb_type[]

  5301.     av_freep(&v->luma_mv_base);

  5302.     ff_intrax8_common_end(&v->x8);

  5303.     return 0;

  5304. }

  5305. 

  5306. 

  5307. /** Decode a VC1/WMV3 frame

  5308.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  5309.  */

  5310. static int vc1_decode_frame(AVCodecContext *avctx, void *data,

  5311.                             int *data_size, AVPacket *avpkt)

  5312. {

  5313.     const uint8_t *buf = avpkt->data;

  5314.     int buf_size = avpkt->size, n_slices = 0, i;

  5315.     VC1Context *v = avctx->priv_data;

  5316.     MpegEncContext *s = &v->s;

  5317.     AVFrame *pict = data;

  5318.     uint8_t *buf2 = NULL;

  5319.     const uint8_t *buf_start = buf;

  5320.     int mb_height, n_slices1;

  5321.     struct {

  5322.         uint8_t *buf;

  5323.         GetBitContext gb;

  5324.         int mby_start;

  5325.     } *slices = NULL, *tmp;

  5326. 

  5327.     /* no supplementary picture */

  5328.     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == VC1_CODE_ENDOFSEQ)) {

  5329.         /* special case for last picture */

  5330.         if (s->low_delay == 0 && s->next_picture_ptr) {

  5331.             *pict = s->next_picture_ptr->f;

  5332.             s->next_picture_ptr = NULL;

  5333. 

  5334.             *data_size = sizeof(AVFrame);

  5335.         }

  5336. 

  5337.         return 0;

  5338.     }

  5339. 

  5340.     if (s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {

  5341.         if (v->profile < PROFILE_ADVANCED)

  5342.             avctx->pix_fmt = AV_PIX_FMT_VDPAU_WMV3;

  5343.         else

  5344.             avctx->pix_fmt = AV_PIX_FMT_VDPAU_VC1;

  5345.     }

  5346. 

  5347.     //for advanced profile we may need to parse and unescape data

  5348.     if (avctx->codec_id == AV_CODEC_ID_VC1 || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5349.         int buf_size2 = 0;

  5350.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5351. 

  5352.         if (IS_MARKER(AV_RB32(buf))) { /* frame starts with marker and needs to be parsed */

  5353.             const uint8_t *start, *end, *next;

  5354.             int size;

  5355. 

  5356.             next = buf;

  5357.             for (start = buf, end = buf + buf_size; next < end; start = next) {

  5358.                 next = find_next_marker(start + 4, end);

  5359.                 size = next - start - 4;

  5360.                 if (size <= 0) continue;

  5361.                 switch (AV_RB32(start)) {

  5362.                 case VC1_CODE_FRAME:

  5363.                     if (avctx->hwaccel ||

  5364.                         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5365.                         buf_start = start;

  5366.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5367.                     break;

  5368.                 case VC1_CODE_FIELD: {

  5369.                     int buf_size3;

  5370.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5371.                     if (!tmp)

  5372.                         goto err;

  5373.                     slices = tmp;

  5374.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5375.                     if (!slices[n_slices].buf)

  5376.                         goto err;

  5377.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5378.                                                     slices[n_slices].buf);

  5379.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5380.                                   buf_size3 << 3);

  5381.                     /* assuming that the field marker is at the exact middle,

  5382.                        hope it's correct */

  5383.                     slices[n_slices].mby_start = s->mb_height >> 1;

  5384.                     n_slices1 = n_slices - 1; // index of the last slice of the first field

  5385.                     n_slices++;

  5386.                     break;

  5387.                 }

  5388.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  5389.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  5390.                     init_get_bits(&s->gb, buf2, buf_size2 * 8);

  5391.                     ff_vc1_decode_entry_point(avctx, v, &s->gb);

  5392.                     break;

  5393.                 case VC1_CODE_SLICE: {

  5394.                     int buf_size3;

  5395.                     tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5396.                     if (!tmp)

  5397.                         goto err;

  5398.                     slices = tmp;

  5399.                     slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5400.                     if (!slices[n_slices].buf)

  5401.                         goto err;

  5402.                     buf_size3 = vc1_unescape_buffer(start + 4, size,

  5403.                                                     slices[n_slices].buf);

  5404.                     init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5405.                                   buf_size3 << 3);

  5406.                     slices[n_slices].mby_start = get_bits(&slices[n_slices].gb, 9);

  5407.                     n_slices++;

  5408.                     break;

  5409.                 }

  5410.                 }

  5411.             }

  5412.         } else if (v->interlace && ((buf[0] & 0xC0) == 0xC0)) { /* WVC1 interlaced stores both fields divided by marker */

  5413.             const uint8_t *divider;

  5414.             int buf_size3;

  5415. 

  5416.             divider = find_next_marker(buf, buf + buf_size);

  5417.             if ((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD) {

  5418.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  5419.                 goto err;

  5420.             } else { // found field marker, unescape second field

  5421.                 tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));

  5422.                 if (!tmp)

  5423.                     goto err;

  5424.                 slices = tmp;

  5425.                 slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  5426.                 if (!slices[n_slices].buf)

  5427.                     goto err;

  5428.                 buf_size3 = vc1_unescape_buffer(divider + 4, buf + buf_size - divider - 4, slices[n_slices].buf);

  5429.                 init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,

  5430.                               buf_size3 << 3);

  5431.                 slices[n_slices].mby_start = s->mb_height >> 1;

  5432.                 n_slices1 = n_slices - 1;

  5433.                 n_slices++;

  5434.             }

  5435.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  5436.         } else {

  5437.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  5438.         }

  5439.         init_get_bits(&s->gb, buf2, buf_size2*8);

  5440.     } else

  5441.         init_get_bits(&s->gb, buf, buf_size*8);

  5442. 

  5443.     if (v->res_sprite) {

  5444.         v->new_sprite  = !get_bits1(&s->gb);

  5445.         v->two_sprites =  get_bits1(&s->gb);

  5446.         /* res_sprite means a Windows Media Image stream, AV_CODEC_ID_*IMAGE means

  5447.            we're using the sprite compositor. These are intentionally kept separate

  5448.            so you can get the raw sprites by using the wmv3 decoder for WMVP or

  5449.            the vc1 one for WVP2 */

  5450.         if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5451.             if (v->new_sprite) {

  5452.                 // switch AVCodecContext parameters to those of the sprites

  5453.                 avctx->width  = avctx->coded_width  = v->sprite_width;

  5454.                 avctx->height = avctx->coded_height = v->sprite_height;

  5455.             } else {

  5456.                 goto image;

  5457.             }

  5458.         }

  5459.     }

  5460. 

  5461.     if (s->context_initialized &&

  5462.         (s->width  != avctx->coded_width ||

  5463.          s->height != avctx->coded_height)) {

  5464.         ff_vc1_decode_end(avctx);

  5465.     }

  5466. 

  5467.     if (!s->context_initialized) {

  5468.         if (ff_msmpeg4_decode_init(avctx) < 0 || ff_vc1_decode_init_alloc_tables(v) < 0)

  5469.             goto err;

  5470. 

  5471.         s->low_delay = !avctx->has_b_frames || v->res_sprite;

  5472. 

  5473.         if (v->profile == PROFILE_ADVANCED) {

  5474.             s->h_edge_pos = avctx->coded_width;

  5475.             s->v_edge_pos = avctx->coded_height;

  5476.         }

  5477.     }

  5478. 

  5479.     /* We need to set current_picture_ptr before reading the header,

  5480.      * otherwise we cannot store anything in there. */

  5481.     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {

  5482.         int i = ff_find_unused_picture(s, 0);

  5483.         if (i < 0)

  5484.             goto err;

  5485.         s->current_picture_ptr = &s->picture[i];

  5486.     }

  5487. 

  5488.     // do parse frame header

  5489.     v->pic_header_flag = 0;

  5490.     if (v->profile < PROFILE_ADVANCED) {

  5491.         if (ff_vc1_parse_frame_header(v, &s->gb) == -1) {

  5492.             goto err;

  5493.         }

  5494.     } else {

  5495.         if (ff_vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  5496.             goto err;

  5497.         }

  5498.     }

  5499. 

  5500.     if ((avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE)

  5501.         && s->pict_type != AV_PICTURE_TYPE_I) {

  5502.         av_log(v->s.avctx, AV_LOG_ERROR, "Sprite decoder: expected I-frame\n");

  5503.         goto err;

  5504.     }

  5505. 

  5506.     // process pulldown flags

  5507.     s->current_picture_ptr->f.repeat_pict = 0;

  5508.     // Pulldown flags are only valid when 'broadcast' has been set.

  5509.     // So ticks_per_frame will be 2

  5510.     if (v->rff) {

  5511.         // repeat field

  5512.         s->current_picture_ptr->f.repeat_pict = 1;

  5513.     } else if (v->rptfrm) {

  5514.         // repeat frames

  5515.         s->current_picture_ptr->f.repeat_pict = v->rptfrm * 2;

  5516.     }

  5517. 

  5518.     // for skipping the frame

  5519.     s->current_picture.f.pict_type = s->pict_type;

  5520.     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;

  5521. 

  5522.     /* skip B-frames if we don't have reference frames */

  5523.     if (s->last_picture_ptr == NULL && (s->pict_type == AV_PICTURE_TYPE_B || s->dropable)) {

  5524.         goto err;

  5525.     }

  5526.     if ((avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B) ||

  5527.         (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I) ||

  5528.          avctx->skip_frame >= AVDISCARD_ALL) {

  5529.         goto end;

  5530.     }

  5531. 

  5532.     if (s->next_p_frame_damaged) {

  5533.         if (s->pict_type == AV_PICTURE_TYPE_B)

  5534.             goto end;

  5535.         else

  5536.             s->next_p_frame_damaged = 0;

  5537.     }

  5538. 

  5539.     if (ff_MPV_frame_start(s, avctx) < 0) {

  5540.         goto err;

  5541.     }

  5542. 

  5543.     s->me.qpel_put = s->dsp.put_qpel_pixels_tab;

  5544.     s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;

  5545. 

  5546.     if ((CONFIG_VC1_VDPAU_DECODER)

  5547.         &&s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

  5548.         ff_vdpau_vc1_decode_picture(s, buf_start, (buf + buf_size) - buf_start);

  5549.     else if (avctx->hwaccel) {

  5550.         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)

  5551.             goto err;

  5552.         if (avctx->hwaccel->decode_slice(avctx, buf_start, (buf + buf_size) - buf_start) < 0)

  5553.             goto err;

  5554.         if (avctx->hwaccel->end_frame(avctx) < 0)

  5555.             goto err;

  5556.     } else {

  5557.         ff_er_frame_start(s);

  5558. 

  5559.         v->bits = buf_size * 8;

  5560.         v->end_mb_x = s->mb_width;

  5561.         if (v->field_mode) {

  5562.             uint8_t *tmp[2];

  5563.             s->current_picture.f.linesize[0] <<= 1;

  5564.             s->current_picture.f.linesize[1] <<= 1;

  5565.             s->current_picture.f.linesize[2] <<= 1;

  5566.             s->linesize                      <<= 1;

  5567.             s->uvlinesize                    <<= 1;

  5568.             tmp[0]          = v->mv_f_last[0];

  5569.             tmp[1]          = v->mv_f_last[1];

  5570.             v->mv_f_last[0] = v->mv_f_next[0];

  5571.             v->mv_f_last[1] = v->mv_f_next[1];

  5572.             v->mv_f_next[0] = v->mv_f[0];

  5573.             v->mv_f_next[1] = v->mv_f[1];

  5574.             v->mv_f[0] = tmp[0];

  5575.             v->mv_f[1] = tmp[1];

  5576.         }

  5577.         mb_height = s->mb_height >> v->field_mode;

  5578.         for (i = 0; i <= n_slices; i++) {

  5579.             if (i > 0 &&  slices[i - 1].mby_start >= mb_height) {

  5580.                 if (v->field_mode <= 0) {

  5581.                     av_log(v->s.avctx, AV_LOG_ERROR, "Slice %d starts beyond "

  5582.                            "picture boundary (%d >= %d)\n", i,

  5583.                            slices[i - 1].mby_start, mb_height);

  5584.                     continue;

  5585.                 }

  5586.                 v->second_field = 1;

  5587.                 v->blocks_off   = s->mb_width  * s->mb_height << 1;

  5588.                 v->mb_off       = s->mb_stride * s->mb_height >> 1;

  5589.             } else {

  5590.                 v->second_field = 0;

  5591.                 v->blocks_off   = 0;

  5592.                 v->mb_off       = 0;

  5593.             }

  5594.             if (i) {

  5595.                 v->pic_header_flag = 0;

  5596.                 if (v->field_mode && i == n_slices1 + 2) {

  5597.                     if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5598.                         av_log(v->s.avctx, AV_LOG_ERROR, "Field header damaged\n");

  5599.                         continue;

  5600.                     }

  5601.                 } else if (get_bits1(&s->gb)) {

  5602.                     v->pic_header_flag = 1;

  5603.                     if (ff_vc1_parse_frame_header_adv(v, &s->gb) < 0) {

  5604.                         av_log(v->s.avctx, AV_LOG_ERROR, "Slice header damaged\n");

  5605.                         continue;

  5606.                     }

  5607.                 }

  5608.             }

  5609.             s->start_mb_y = (i == 0) ? 0 : FFMAX(0, slices[i-1].mby_start % mb_height);

  5610.             if (!v->field_mode || v->second_field)

  5611.                 s->end_mb_y = (i == n_slices     ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  5612.             else

  5613.                 s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);

  5614.             ff_vc1_decode_blocks(v);

  5615.             if (i != n_slices)

  5616.                 s->gb = slices[i].gb;

  5617.         }

  5618.         if (v->field_mode) {

  5619.             v->second_field = 0;

  5620.             if (s->pict_type == AV_PICTURE_TYPE_B) {

  5621.                 memcpy(v->mv_f_base, v->mv_f_next_base,

  5622.                        2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));

  5623.             }

  5624.             s->current_picture.f.linesize[0] >>= 1;

  5625.             s->current_picture.f.linesize[1] >>= 1;

  5626.             s->current_picture.f.linesize[2] >>= 1;

  5627.             s->linesize                      >>= 1;

  5628.             s->uvlinesize                    >>= 1;

  5629.         }

  5630.         av_dlog(s->avctx, "Consumed %i/%i bits\n",

  5631.                 get_bits_count(&s->gb), s->gb.size_in_bits);

  5632. //  if (get_bits_count(&s->gb) > buf_size * 8)

  5633. //      return -1;

  5634.         ff_er_frame_end(s);

  5635.     }

  5636. 

  5637.     ff_MPV_frame_end(s);

  5638. 

  5639.     if (avctx->codec_id == AV_CODEC_ID_WMV3IMAGE || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {

  5640. image:

  5641.         avctx->width  = avctx->coded_width  = v->output_width;

  5642.         avctx->height = avctx->coded_height = v->output_height;

  5643.         if (avctx->skip_frame >= AVDISCARD_NONREF)

  5644.             goto end;

  5645. #if CONFIG_WMV3IMAGE_DECODER || CONFIG_VC1IMAGE_DECODER

  5646.         if (vc1_decode_sprites(v, &s->gb))

  5647.             goto err;

  5648. #endif

  5649.         *pict      = v->sprite_output_frame;

  5650.         *data_size = sizeof(AVFrame);

  5651.     } else {

  5652.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  5653.             *pict = s->current_picture_ptr->f;

  5654.         } else if (s->last_picture_ptr != NULL) {

  5655.             *pict = s->last_picture_ptr->f;

  5656.         }

  5657.         if (s->last_picture_ptr || s->low_delay) {

  5658.             *data_size = sizeof(AVFrame);

  5659.             ff_print_debug_info(s, pict);

  5660.         }

  5661.     }

  5662. 

  5663. end:

  5664.     av_free(buf2);

  5665.     for (i = 0; i < n_slices; i++)

  5666.         av_free(slices[i].buf);

  5667.     av_free(slices);

  5668.     return buf_size;

  5669. 

  5670. err:

  5671.     av_free(buf2);

  5672.     for (i = 0; i < n_slices; i++)

  5673.         av_free(slices[i].buf);

  5674.     av_free(slices);

  5675.     return -1;

  5676. }

  5677. 

  5678. 

  5679. static const AVProfile profiles[] = {

  5680.     { FF_PROFILE_VC1_SIMPLE,   "Simple"   },

  5681.     { FF_PROFILE_VC1_MAIN,     "Main"     },

  5682.     { FF_PROFILE_VC1_COMPLEX,  "Complex"  },

  5683.     { FF_PROFILE_VC1_ADVANCED, "Advanced" },

  5684.     { FF_PROFILE_UNKNOWN },

  5685. };

  5686. 

  5687. AVCodec ff_vc1_decoder = {

  5688.     .name           = "vc1",

  5689.     .type           = AVMEDIA_TYPE_VIDEO,

  5690.     .id             = AV_CODEC_ID_VC1,

  5691.     .priv_data_size = sizeof(VC1Context),

  5692.     .init           = vc1_decode_init,

  5693.     .close          = ff_vc1_decode_end,

  5694.     .decode         = vc1_decode_frame,

  5695.     .flush          = ff_mpeg_flush,

  5696.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  5697.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1"),

  5698.     .pix_fmts       = ff_hwaccel_pixfmt_list_420,

  5699.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5700. };

  5701. 

  5702. #if CONFIG_WMV3_DECODER

  5703. AVCodec ff_wmv3_decoder = {

  5704.     .name           = "wmv3",

  5705.     .type           = AVMEDIA_TYPE_VIDEO,

  5706.     .id             = AV_CODEC_ID_WMV3,

  5707.     .priv_data_size = sizeof(VC1Context),

  5708.     .init           = vc1_decode_init,

  5709.     .close          = ff_vc1_decode_end,

  5710.     .decode         = vc1_decode_frame,

  5711.     .flush          = ff_mpeg_flush,

  5712.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  5713.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9"),

  5714.     .pix_fmts       = ff_hwaccel_pixfmt_list_420,

  5715.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5716. };

  5717. #endif

  5718. 

  5719. #if CONFIG_WMV3_VDPAU_DECODER

  5720. AVCodec ff_wmv3_vdpau_decoder = {

  5721.     .name           = "wmv3_vdpau",

  5722.     .type           = AVMEDIA_TYPE_VIDEO,

  5723.     .id             = AV_CODEC_ID_WMV3,

  5724.     .priv_data_size = sizeof(VC1Context),

  5725.     .init           = vc1_decode_init,

  5726.     .close          = ff_vc1_decode_end,

  5727.     .decode         = vc1_decode_frame,

  5728.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,

  5729.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 VDPAU"),

  5730.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_WMV3, AV_PIX_FMT_NONE },

  5731.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5732. };

  5733. #endif

  5734. 

  5735. #if CONFIG_VC1_VDPAU_DECODER

  5736. AVCodec ff_vc1_vdpau_decoder = {

  5737.     .name           = "vc1_vdpau",

  5738.     .type           = AVMEDIA_TYPE_VIDEO,

  5739.     .id             = AV_CODEC_ID_VC1,

  5740.     .priv_data_size = sizeof(VC1Context),

  5741.     .init           = vc1_decode_init,

  5742.     .close          = ff_vc1_decode_end,

  5743.     .decode         = vc1_decode_frame,

  5744.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,

  5745.     .long_name      = NULL_IF_CONFIG_SMALL("SMPTE VC-1 VDPAU"),

  5746.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_VC1, AV_PIX_FMT_NONE },

  5747.     .profiles       = NULL_IF_CONFIG_SMALL(profiles)

  5748. };

  5749. #endif

  5750. 

  5751. #if CONFIG_WMV3IMAGE_DECODER

  5752. AVCodec ff_wmv3image_decoder = {

  5753.     .name           = "wmv3image",

  5754.     .type           = AVMEDIA_TYPE_VIDEO,

  5755.     .id             = AV_CODEC_ID_WMV3IMAGE,

  5756.     .priv_data_size = sizeof(VC1Context),

  5757.     .init           = vc1_decode_init,

  5758.     .close          = ff_vc1_decode_end,

  5759.     .decode         = vc1_decode_frame,

  5760.     .capabilities   = CODEC_CAP_DR1,

  5761.     .flush          = vc1_sprite_flush,

  5762.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image"),

  5763.     .pix_fmts       = ff_pixfmt_list_420

  5764. };

  5765. #endif

  5766. 

  5767. #if CONFIG_VC1IMAGE_DECODER

  5768. AVCodec ff_vc1image_decoder = {

  5769.     .name           = "vc1image",

  5770.     .type           = AVMEDIA_TYPE_VIDEO,

  5771.     .id             = AV_CODEC_ID_VC1IMAGE,

  5772.     .priv_data_size = sizeof(VC1Context),

  5773.     .init           = vc1_decode_init,

  5774.     .close          = ff_vc1_decode_end,

  5775.     .decode         = vc1_decode_frame,

  5776.     .capabilities   = CODEC_CAP_DR1,

  5777.     .flush          = vc1_sprite_flush,

  5778.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 9 Image v2"),

  5779.     .pix_fmts       = ff_pixfmt_list_420

  5780. };

  5781. #endif