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FFmpeg/libavcodec/vc1.c

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  1. /*

  2.  * VC-1 and WMV3 decoder common code

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

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

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file libavcodec/vc1.c

  25.  * VC-1 and WMV3 decoder common code

  26.  *

  27.  */

  28. #include "internal.h"

  29. #include "dsputil.h"

  30. #include "avcodec.h"

  31. #include "mpegvideo.h"

  32. #include "vc1.h"

  33. #include "vc1data.h"

  34. #include "msmpeg4data.h"

  35. #include "unary.h"

  36. #include "simple_idct.h"

  37. 

  38. #undef NDEBUG

  39. #include <assert.h>

  40. 

  41. /***********************************************************************/

  42. /**

  43.  * @defgroup vc1bitplane VC-1 Bitplane decoding

  44.  * @see 8.7, p56

  45.  * @{

  46.  */

  47. 

  48. /**

  49.  * Imode types

  50.  * @{

  51.  */

  52. enum Imode {

  53.     IMODE_RAW,

  54.     IMODE_NORM2,

  55.     IMODE_DIFF2,

  56.     IMODE_NORM6,

  57.     IMODE_DIFF6,

  58.     IMODE_ROWSKIP,

  59.     IMODE_COLSKIP

  60. };

  61. /** @} */ //imode defines

  62. 

  63. /** Decode rows by checking if they are skipped

  64.  * @param plane Buffer to store decoded bits

  65.  * @param[in] width Width of this buffer

  66.  * @param[in] height Height of this buffer

  67.  * @param[in] stride of this buffer

  68.  */

  69. static void decode_rowskip(uint8_t* plane, int width, int height, int stride, GetBitContext *gb){

  70.     int x, y;

  71. 

  72.     for (y=0; y<height; y++){

  73.         if (!get_bits1(gb)) //rowskip

  74.             memset(plane, 0, width);

  75.         else

  76.             for (x=0; x<width; x++)

  77.                 plane[x] = get_bits1(gb);

  78.         plane += stride;

  79.     }

  80. }

  81. 

  82. /** Decode columns by checking if they are skipped

  83.  * @param plane Buffer to store decoded bits

  84.  * @param[in] width Width of this buffer

  85.  * @param[in] height Height of this buffer

  86.  * @param[in] stride of this buffer

  87.  * @todo FIXME: Optimize

  88.  */

  89. static void decode_colskip(uint8_t* plane, int width, int height, int stride, GetBitContext *gb){

  90.     int x, y;

  91. 

  92.     for (x=0; x<width; x++){

  93.         if (!get_bits1(gb)) //colskip

  94.             for (y=0; y<height; y++)

  95.                 plane[y*stride] = 0;

  96.         else

  97.             for (y=0; y<height; y++)

  98.                 plane[y*stride] = get_bits1(gb);

  99.         plane ++;

  100.     }

  101. }

  102. 

  103. /** Decode a bitplane's bits

  104.  * @param data bitplane where to store the decode bits

  105.  * @param[out] raw_flag pointer to the flag indicating that this bitplane is not coded explicitly

  106.  * @param v VC-1 context for bit reading and logging

  107.  * @return Status

  108.  * @todo FIXME: Optimize

  109.  */

  110. static int bitplane_decoding(uint8_t* data, int *raw_flag, VC1Context *v)

  111. {

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

  113. 

  114.     int imode, x, y, code, offset;

  115.     uint8_t invert, *planep = data;

  116.     int width, height, stride;

  117. 

  118.     width = v->s.mb_width;

  119.     height = v->s.mb_height;

  120.     stride = v->s.mb_stride;

  121.     invert = get_bits1(gb);

  122.     imode = get_vlc2(gb, ff_vc1_imode_vlc.table, VC1_IMODE_VLC_BITS, 1);

  123. 

  124.     *raw_flag = 0;

  125.     switch (imode)

  126.     {

  127.     case IMODE_RAW:

  128.         //Data is actually read in the MB layer (same for all tests == "raw")

  129.         *raw_flag = 1; //invert ignored

  130.         return invert;

  131.     case IMODE_DIFF2:

  132.     case IMODE_NORM2:

  133.         if ((height * width) & 1)

  134.         {

  135.             *planep++ = get_bits1(gb);

  136.             offset = 1;

  137.         }

  138.         else offset = 0;

  139.         // decode bitplane as one long line

  140.         for (y = offset; y < height * width; y += 2) {

  141.             code = get_vlc2(gb, ff_vc1_norm2_vlc.table, VC1_NORM2_VLC_BITS, 1);

  142.             *planep++ = code & 1;

  143.             offset++;

  144.             if(offset == width) {

  145.                 offset = 0;

  146.                 planep += stride - width;

  147.             }

  148.             *planep++ = code >> 1;

  149.             offset++;

  150.             if(offset == width) {

  151.                 offset = 0;

  152.                 planep += stride - width;

  153.             }

  154.         }

  155.         break;

  156.     case IMODE_DIFF6:

  157.     case IMODE_NORM6:

  158.         if(!(height % 3) && (width % 3)) { // use 2x3 decoding

  159.             for(y = 0; y < height; y+= 3) {

  160.                 for(x = width & 1; x < width; x += 2) {

  161.                     code = get_vlc2(gb, ff_vc1_norm6_vlc.table, VC1_NORM6_VLC_BITS, 2);

  162.                     if(code < 0){

  163.                         av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");

  164.                         return -1;

  165.                     }

  166.                     planep[x + 0] = (code >> 0) & 1;

  167.                     planep[x + 1] = (code >> 1) & 1;

  168.                     planep[x + 0 + stride] = (code >> 2) & 1;

  169.                     planep[x + 1 + stride] = (code >> 3) & 1;

  170.                     planep[x + 0 + stride * 2] = (code >> 4) & 1;

  171.                     planep[x + 1 + stride * 2] = (code >> 5) & 1;

  172.                 }

  173.                 planep += stride * 3;

  174.             }

  175.             if(width & 1) decode_colskip(data, 1, height, stride, &v->s.gb);

  176.         } else { // 3x2

  177.             planep += (height & 1) * stride;

  178.             for(y = height & 1; y < height; y += 2) {

  179.                 for(x = width % 3; x < width; x += 3) {

  180.                     code = get_vlc2(gb, ff_vc1_norm6_vlc.table, VC1_NORM6_VLC_BITS, 2);

  181.                     if(code < 0){

  182.                         av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");

  183.                         return -1;

  184.                     }

  185.                     planep[x + 0] = (code >> 0) & 1;

  186.                     planep[x + 1] = (code >> 1) & 1;

  187.                     planep[x + 2] = (code >> 2) & 1;

  188.                     planep[x + 0 + stride] = (code >> 3) & 1;

  189.                     planep[x + 1 + stride] = (code >> 4) & 1;

  190.                     planep[x + 2 + stride] = (code >> 5) & 1;

  191.                 }

  192.                 planep += stride * 2;

  193.             }

  194.             x = width % 3;

  195.             if(x) decode_colskip(data  ,             x, height    , stride, &v->s.gb);

  196.             if(height & 1) decode_rowskip(data+x, width - x, 1, stride, &v->s.gb);

  197.         }

  198.         break;

  199.     case IMODE_ROWSKIP:

  200.         decode_rowskip(data, width, height, stride, &v->s.gb);

  201.         break;

  202.     case IMODE_COLSKIP:

  203.         decode_colskip(data, width, height, stride, &v->s.gb);

  204.         break;

  205.     default: break;

  206.     }

  207. 

  208.     /* Applying diff operator */

  209.     if (imode == IMODE_DIFF2 || imode == IMODE_DIFF6)

  210.     {

  211.         planep = data;

  212.         planep[0] ^= invert;

  213.         for (x=1; x<width; x++)

  214.             planep[x] ^= planep[x-1];

  215.         for (y=1; y<height; y++)

  216.         {

  217.             planep += stride;

  218.             planep[0] ^= planep[-stride];

  219.             for (x=1; x<width; x++)

  220.             {

  221.                 if (planep[x-1] != planep[x-stride]) planep[x] ^= invert;

  222.                 else                                 planep[x] ^= planep[x-1];

  223.             }

  224.         }

  225.     }

  226.     else if (invert)

  227.     {

  228.         planep = data;

  229.         for (x=0; x<stride*height; x++) planep[x] = !planep[x]; //FIXME stride

  230.     }

  231.     return (imode<<1) + invert;

  232. }

  233. 

  234. /** @} */ //Bitplane group

  235. 

  236. /***********************************************************************/

  237. /** VOP Dquant decoding

  238.  * @param v VC-1 Context

  239.  */

  240. static int vop_dquant_decoding(VC1Context *v)

  241. {

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

  243.     int pqdiff;

  244. 

  245.     //variable size

  246.     if (v->dquant == 2)

  247.     {

  248.         pqdiff = get_bits(gb, 3);

  249.         if (pqdiff == 7) v->altpq = get_bits(gb, 5);

  250.         else v->altpq = v->pq + pqdiff + 1;

  251.     }

  252.     else

  253.     {

  254.         v->dquantfrm = get_bits1(gb);

  255.         if ( v->dquantfrm )

  256.         {

  257.             v->dqprofile = get_bits(gb, 2);

  258.             switch (v->dqprofile)

  259.             {

  260.             case DQPROFILE_SINGLE_EDGE:

  261.             case DQPROFILE_DOUBLE_EDGES:

  262.                 v->dqsbedge = get_bits(gb, 2);

  263.                 break;

  264.             case DQPROFILE_ALL_MBS:

  265.                 v->dqbilevel = get_bits1(gb);

  266.                 if(!v->dqbilevel)

  267.                     v->halfpq = 0;

  268.             default: break; //Forbidden ?

  269.             }

  270.             if (v->dqbilevel || v->dqprofile != DQPROFILE_ALL_MBS)

  271.             {

  272.                 pqdiff = get_bits(gb, 3);

  273.                 if (pqdiff == 7) v->altpq = get_bits(gb, 5);

  274.                 else v->altpq = v->pq + pqdiff + 1;

  275.             }

  276.         }

  277.     }

  278.     return 0;

  279. }

  280. 

  281. static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);

  282. 

  283. /**

  284.  * Decode Simple/Main Profiles sequence header

  285.  * @see Figure 7-8, p16-17

  286.  * @param avctx Codec context

  287.  * @param gb GetBit context initialized from Codec context extra_data

  288.  * @return Status

  289.  */

  290. int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)

  291. {

  292.     av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));

  293.     v->profile = get_bits(gb, 2);

  294.     if (v->profile == PROFILE_COMPLEX)

  295.     {

  296.         av_log(avctx, AV_LOG_ERROR, "WMV3 Complex Profile is not fully supported\n");

  297.     }

  298. 

  299.     if (v->profile == PROFILE_ADVANCED)

  300.     {

  301.         v->zz_8x4 = ff_vc1_adv_progressive_8x4_zz;

  302.         v->zz_4x8 = ff_vc1_adv_progressive_4x8_zz;

  303.         return decode_sequence_header_adv(v, gb);

  304.     }

  305.     else

  306.     {

  307.         v->zz_8x4 = wmv2_scantableA;

  308.         v->zz_4x8 = wmv2_scantableB;

  309.         v->res_sm = get_bits(gb, 2); //reserved

  310.         if (v->res_sm)

  311.         {

  312.             av_log(avctx, AV_LOG_ERROR,

  313.                    "Reserved RES_SM=%i is forbidden\n", v->res_sm);

  314.             return -1;

  315.         }

  316.     }

  317. 

  318.     // (fps-2)/4 (->30)

  319.     v->frmrtq_postproc = get_bits(gb, 3); //common

  320.     // (bitrate-32kbps)/64kbps

  321.     v->bitrtq_postproc = get_bits(gb, 5); //common

  322.     v->s.loop_filter = get_bits1(gb); //common

  323.     if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)

  324.     {

  325.         av_log(avctx, AV_LOG_ERROR,

  326.                "LOOPFILTER shell not be enabled in simple profile\n");

  327.     }

  328.     if(v->s.avctx->skip_loop_filter >= AVDISCARD_ALL)

  329.         v->s.loop_filter = 0;

  330. 

  331.     v->res_x8 = get_bits1(gb); //reserved

  332.     v->multires = get_bits1(gb);

  333.     v->res_fasttx = get_bits1(gb);

  334.     if (!v->res_fasttx)

  335.     {

  336.         v->s.dsp.vc1_inv_trans_8x8 = ff_simple_idct;

  337.         v->s.dsp.vc1_inv_trans_8x4 = ff_simple_idct84_add;

  338.         v->s.dsp.vc1_inv_trans_4x8 = ff_simple_idct48_add;

  339.         v->s.dsp.vc1_inv_trans_4x4 = ff_simple_idct44_add;

  340.     }

  341. 

  342.     v->fastuvmc =  get_bits1(gb); //common

  343.     if (!v->profile && !v->fastuvmc)

  344.     {

  345.         av_log(avctx, AV_LOG_ERROR,

  346.                "FASTUVMC unavailable in Simple Profile\n");

  347.         return -1;

  348.     }

  349.     v->extended_mv =  get_bits1(gb); //common

  350.     if (!v->profile && v->extended_mv)

  351.     {

  352.         av_log(avctx, AV_LOG_ERROR,

  353.                "Extended MVs unavailable in Simple Profile\n");

  354.         return -1;

  355.     }

  356.     v->dquant =  get_bits(gb, 2); //common

  357.     v->vstransform =  get_bits1(gb); //common

  358. 

  359.     v->res_transtab = get_bits1(gb);

  360.     if (v->res_transtab)

  361.     {

  362.         av_log(avctx, AV_LOG_ERROR,

  363.                "1 for reserved RES_TRANSTAB is forbidden\n");

  364.         return -1;

  365.     }

  366. 

  367.     v->overlap = get_bits1(gb); //common

  368. 

  369.     v->s.resync_marker = get_bits1(gb);

  370.     v->rangered = get_bits1(gb);

  371.     if (v->rangered && v->profile == PROFILE_SIMPLE)

  372.     {

  373.         av_log(avctx, AV_LOG_INFO,

  374.                "RANGERED should be set to 0 in simple profile\n");

  375.     }

  376. 

  377.     v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common

  378.     v->quantizer_mode = get_bits(gb, 2); //common

  379. 

  380.     v->finterpflag = get_bits1(gb); //common

  381.     v->res_rtm_flag = get_bits1(gb); //reserved

  382.     if (!v->res_rtm_flag)

  383.     {

  384. //            av_log(avctx, AV_LOG_ERROR,

  385. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  386.         av_log(avctx, AV_LOG_ERROR,

  387.                "Old WMV3 version detected, only I-frames will be decoded\n");

  388.         //return -1;

  389.     }

  390.     //TODO: figure out what they mean (always 0x402F)

  391.     if(!v->res_fasttx) skip_bits(gb, 16);

  392.     av_log(avctx, AV_LOG_DEBUG,

  393.                "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  394.                "LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"

  395.                "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"

  396.                "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",

  397.                v->profile, v->frmrtq_postproc, v->bitrtq_postproc,

  398.                v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,

  399.                v->rangered, v->vstransform, v->overlap, v->s.resync_marker,

  400.                v->dquant, v->quantizer_mode, avctx->max_b_frames

  401.                );

  402.     return 0;

  403. }

  404. 

  405. static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)

  406. {

  407.     v->res_rtm_flag = 1;

  408.     v->level = get_bits(gb, 3);

  409.     if(v->level >= 5)

  410.     {

  411.         av_log(v->s.avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);

  412.     }

  413.     v->chromaformat = get_bits(gb, 2);

  414.     if (v->chromaformat != 1)

  415.     {

  416.         av_log(v->s.avctx, AV_LOG_ERROR,

  417.                "Only 4:2:0 chroma format supported\n");

  418.         return -1;

  419.     }

  420. 

  421.     // (fps-2)/4 (->30)

  422.     v->frmrtq_postproc = get_bits(gb, 3); //common

  423.     // (bitrate-32kbps)/64kbps

  424.     v->bitrtq_postproc = get_bits(gb, 5); //common

  425.     v->postprocflag = get_bits1(gb); //common

  426. 

  427.     v->s.avctx->coded_width = (get_bits(gb, 12) + 1) << 1;

  428.     v->s.avctx->coded_height = (get_bits(gb, 12) + 1) << 1;

  429.     v->s.avctx->width = v->s.avctx->coded_width;

  430.     v->s.avctx->height = v->s.avctx->coded_height;

  431.     v->broadcast = get_bits1(gb);

  432.     v->interlace = get_bits1(gb);

  433.     v->tfcntrflag = get_bits1(gb);

  434.     v->finterpflag = get_bits1(gb);

  435.     skip_bits1(gb); // reserved

  436. 

  437.     v->s.h_edge_pos = v->s.avctx->coded_width;

  438.     v->s.v_edge_pos = v->s.avctx->coded_height;

  439. 

  440.     av_log(v->s.avctx, AV_LOG_DEBUG,

  441.                "Advanced Profile level %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"

  442.                "LoopFilter=%i, ChromaFormat=%i, Pulldown=%i, Interlace: %i\n"

  443.                "TFCTRflag=%i, FINTERPflag=%i\n",

  444.                v->level, v->frmrtq_postproc, v->bitrtq_postproc,

  445.                v->s.loop_filter, v->chromaformat, v->broadcast, v->interlace,

  446.                v->tfcntrflag, v->finterpflag

  447.                );

  448. 

  449.     v->psf = get_bits1(gb);

  450.     if(v->psf) { //PsF, 6.1.13

  451.         av_log(v->s.avctx, AV_LOG_ERROR, "Progressive Segmented Frame mode: not supported (yet)\n");

  452.         return -1;

  453.     }

  454.     v->s.max_b_frames = v->s.avctx->max_b_frames = 7;

  455.     if(get_bits1(gb)) { //Display Info - decoding is not affected by it

  456.         int w, h, ar = 0;

  457.         av_log(v->s.avctx, AV_LOG_DEBUG, "Display extended info:\n");

  458.         v->s.avctx->width  = w = get_bits(gb, 14) + 1;

  459.         v->s.avctx->height = h = get_bits(gb, 14) + 1;

  460.         av_log(v->s.avctx, AV_LOG_DEBUG, "Display dimensions: %ix%i\n", w, h);

  461.         if(get_bits1(gb))

  462.             ar = get_bits(gb, 4);

  463.         if(ar && ar < 14){

  464.             v->s.avctx->sample_aspect_ratio = ff_vc1_pixel_aspect[ar];

  465.         }else if(ar == 15){

  466.             w = get_bits(gb, 8);

  467.             h = get_bits(gb, 8);

  468.             v->s.avctx->sample_aspect_ratio = (AVRational){w, h};

  469.         }

  470.         av_log(v->s.avctx, AV_LOG_DEBUG, "Aspect: %i:%i\n", v->s.avctx->sample_aspect_ratio.num, v->s.avctx->sample_aspect_ratio.den);

  471. 

  472.         if(get_bits1(gb)){ //framerate stuff

  473.             if(get_bits1(gb)) {

  474.                 v->s.avctx->time_base.num = 32;

  475.                 v->s.avctx->time_base.den = get_bits(gb, 16) + 1;

  476.             } else {

  477.                 int nr, dr;

  478.                 nr = get_bits(gb, 8);

  479.                 dr = get_bits(gb, 4);

  480.                 if(nr && nr < 8 && dr && dr < 3){

  481.                     v->s.avctx->time_base.num = ff_vc1_fps_dr[dr - 1];

  482.                     v->s.avctx->time_base.den = ff_vc1_fps_nr[nr - 1] * 1000;

  483.                 }

  484.             }

  485.         }

  486. 

  487.         if(get_bits1(gb)){

  488.             v->color_prim = get_bits(gb, 8);

  489.             v->transfer_char = get_bits(gb, 8);

  490.             v->matrix_coef = get_bits(gb, 8);

  491.         }

  492.     }

  493. 

  494.     v->hrd_param_flag = get_bits1(gb);

  495.     if(v->hrd_param_flag) {

  496.         int i;

  497.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  498.         skip_bits(gb, 4); //bitrate exponent

  499.         skip_bits(gb, 4); //buffer size exponent

  500.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  501.             skip_bits(gb, 16); //hrd_rate[n]

  502.             skip_bits(gb, 16); //hrd_buffer[n]

  503.         }

  504.     }

  505.     return 0;

  506. }

  507. 

  508. int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)

  509. {

  510.     int i;

  511. 

  512.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  513.     v->broken_link = get_bits1(gb);

  514.     v->closed_entry = get_bits1(gb);

  515.     v->panscanflag = get_bits1(gb);

  516.     v->refdist_flag = get_bits1(gb);

  517.     v->s.loop_filter = get_bits1(gb);

  518.     v->fastuvmc = get_bits1(gb);

  519.     v->extended_mv = get_bits1(gb);

  520.     v->dquant = get_bits(gb, 2);

  521.     v->vstransform = get_bits1(gb);

  522.     v->overlap = get_bits1(gb);

  523.     v->quantizer_mode = get_bits(gb, 2);

  524. 

  525.     if(v->hrd_param_flag){

  526.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  527.             skip_bits(gb, 8); //hrd_full[n]

  528.         }

  529.     }

  530. 

  531.     if(get_bits1(gb)){

  532.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

  533.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  534.     }

  535.     if(v->extended_mv)

  536.         v->extended_dmv = get_bits1(gb);

  537.     if((v->range_mapy_flag = get_bits1(gb))) {

  538.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  539.         v->range_mapy = get_bits(gb, 3);

  540.     }

  541.     if((v->range_mapuv_flag = get_bits1(gb))) {

  542.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  543.         v->range_mapuv = get_bits(gb, 3);

  544.     }

  545. 

  546.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  547.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  548.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  549.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  550.         v->broken_link, v->closed_entry, v->panscanflag, v->refdist_flag, v->s.loop_filter,

  551.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  552. 

  553.     return 0;

  554. }

  555. 

  556. int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  557. {

  558.     int pqindex, lowquant, status;

  559. 

  560.     if(v->finterpflag) v->interpfrm = get_bits1(gb);

  561.     skip_bits(gb, 2); //framecnt unused

  562.     v->rangeredfrm = 0;

  563.     if (v->rangered) v->rangeredfrm = get_bits1(gb);

  564.     v->s.pict_type = get_bits1(gb);

  565.     if (v->s.avctx->max_b_frames) {

  566.         if (!v->s.pict_type) {

  567.             if (get_bits1(gb)) v->s.pict_type = FF_I_TYPE;

  568.             else v->s.pict_type = FF_B_TYPE;

  569.         } else v->s.pict_type = FF_P_TYPE;

  570.     } else v->s.pict_type = v->s.pict_type ? FF_P_TYPE : FF_I_TYPE;

  571. 

  572.     v->bi_type = 0;

  573.     if(v->s.pict_type == FF_B_TYPE) {

  574.         v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  575.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];

  576.         if(v->bfraction == 0) {

  577.             v->s.pict_type = FF_BI_TYPE;

  578.         }

  579.     }

  580.     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)

  581.         skip_bits(gb, 7); // skip buffer fullness

  582. 

  583.     if(v->parse_only)

  584.         return 0;

  585. 

  586.     /* calculate RND */

  587.     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)

  588.         v->rnd = 1;

  589.     if(v->s.pict_type == FF_P_TYPE)

  590.         v->rnd ^= 1;

  591. 

  592.     /* Quantizer stuff */

  593.     pqindex = get_bits(gb, 5);

  594.     if(!pqindex) return -1;

  595.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  596.         v->pq = ff_vc1_pquant_table[0][pqindex];

  597.     else

  598.         v->pq = ff_vc1_pquant_table[1][pqindex];

  599. 

  600.     v->pquantizer = 1;

  601.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  602.         v->pquantizer = pqindex < 9;

  603.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  604.         v->pquantizer = 0;

  605.     v->pqindex = pqindex;

  606.     if (pqindex < 9) v->halfpq = get_bits1(gb);

  607.     else v->halfpq = 0;

  608.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  609.         v->pquantizer = get_bits1(gb);

  610.     v->dquantfrm = 0;

  611.     if (v->extended_mv == 1) v->mvrange = get_unary(gb, 0, 3);

  612.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  613.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  614.     v->range_x = 1 << (v->k_x - 1);

  615.     v->range_y = 1 << (v->k_y - 1);

  616.     if (v->multires && v->s.pict_type != FF_B_TYPE) v->respic = get_bits(gb, 2);

  617. 

  618.     if(v->res_x8 && (v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)){

  619.         v->x8_type = get_bits1(gb);

  620.     }else v->x8_type = 0;

  621. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  622. //        (v->s.pict_type == FF_P_TYPE) ? 'P' : ((v->s.pict_type == FF_I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  623. 

  624.     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_P_TYPE) v->use_ic = 0;

  625. 

  626.     switch(v->s.pict_type) {

  627.     case FF_P_TYPE:

  628.         if (v->pq < 5) v->tt_index = 0;

  629.         else if(v->pq < 13) v->tt_index = 1;

  630.         else v->tt_index = 2;

  631. 

  632.         lowquant = (v->pq > 12) ? 0 : 1;

  633.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];

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

  635.         {

  636.             int scale, shift, i;

  637.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];

  638.             v->lumscale = get_bits(gb, 6);

  639.             v->lumshift = get_bits(gb, 6);

  640.             v->use_ic = 1;

  641.             /* fill lookup tables for intensity compensation */

  642.             if(!v->lumscale) {

  643.                 scale = -64;

  644.                 shift = (255 - v->lumshift * 2) << 6;

  645.                 if(v->lumshift > 31)

  646.                     shift += 128 << 6;

  647.             } else {

  648.                 scale = v->lumscale + 32;

  649.                 if(v->lumshift > 31)

  650.                     shift = (v->lumshift - 64) << 6;

  651.                 else

  652.                     shift = v->lumshift << 6;

  653.             }

  654.             for(i = 0; i < 256; i++) {

  655.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  656.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  657.             }

  658.         }

  659.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  660.             v->s.quarter_sample = 0;

  661.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  662.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  663.                 v->s.quarter_sample = 0;

  664.             else

  665.                 v->s.quarter_sample = 1;

  666.         } else

  667.             v->s.quarter_sample = 1;

  668.         v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));

  669. 

  670.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  671.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  672.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  673.         {

  674.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  675.             if (status < 0) return -1;

  676.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  677.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  678.         } else {

  679.             v->mv_type_is_raw = 0;

  680.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  681.         }

  682.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  683.         if (status < 0) return -1;

  684.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  685.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  686. 

  687.         /* Hopefully this is correct for P frames */

  688.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  689.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  690. 

  691.         if (v->dquant)

  692.         {

  693.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  694.             vop_dquant_decoding(v);

  695.         }

  696. 

  697.         v->ttfrm = 0; //FIXME Is that so ?

  698.         if (v->vstransform)

  699.         {

  700.             v->ttmbf = get_bits1(gb);

  701.             if (v->ttmbf)

  702.             {

  703.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  704.             }

  705.         } else {

  706.             v->ttmbf = 1;

  707.             v->ttfrm = TT_8X8;

  708.         }

  709.         break;

  710.     case FF_B_TYPE:

  711.         if (v->pq < 5) v->tt_index = 0;

  712.         else if(v->pq < 13) v->tt_index = 1;

  713.         else v->tt_index = 2;

  714. 

  715.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  716.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  717.         v->s.mspel = v->s.quarter_sample;

  718. 

  719.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  720.         if (status < 0) return -1;

  721.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  722.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  723.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  724.         if (status < 0) return -1;

  725.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  726.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  727. 

  728.         v->s.mv_table_index = get_bits(gb, 2);

  729.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  730. 

  731.         if (v->dquant)

  732.         {

  733.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  734.             vop_dquant_decoding(v);

  735.         }

  736. 

  737.         v->ttfrm = 0;

  738.         if (v->vstransform)

  739.         {

  740.             v->ttmbf = get_bits1(gb);

  741.             if (v->ttmbf)

  742.             {

  743.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  744.             }

  745.         } else {

  746.             v->ttmbf = 1;

  747.             v->ttfrm = TT_8X8;

  748.         }

  749.         break;

  750.     }

  751. 

  752.     if(!v->x8_type)

  753.     {

  754.         /* AC Syntax */

  755.         v->c_ac_table_index = decode012(gb);

  756.         if (v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)

  757.         {

  758.             v->y_ac_table_index = decode012(gb);

  759.         }

  760.         /* DC Syntax */

  761.         v->s.dc_table_index = get_bits1(gb);

  762.     }

  763. 

  764.     if(v->s.pict_type == FF_BI_TYPE) {

  765.         v->s.pict_type = FF_B_TYPE;

  766.         v->bi_type = 1;

  767.     }

  768.     return 0;

  769. }

  770. 

  771. int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  772. {

  773.     int pqindex, lowquant;

  774.     int status;

  775. 

  776.     v->p_frame_skipped = 0;

  777. 

  778.     if(v->interlace){

  779.         v->fcm = decode012(gb);

  780.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  781.     }

  782.     switch(get_unary(gb, 0, 4)) {

  783.     case 0:

  784.         v->s.pict_type = FF_P_TYPE;

  785.         break;

  786.     case 1:

  787.         v->s.pict_type = FF_B_TYPE;

  788.         break;

  789.     case 2:

  790.         v->s.pict_type = FF_I_TYPE;

  791.         break;

  792.     case 3:

  793.         v->s.pict_type = FF_BI_TYPE;

  794.         break;

  795.     case 4:

  796.         v->s.pict_type = FF_P_TYPE; // skipped pic

  797.         v->p_frame_skipped = 1;

  798.         return 0;

  799.     }

  800.     if(v->tfcntrflag)

  801.         skip_bits(gb, 8);

  802.     if(v->broadcast) {

  803.         if(!v->interlace || v->psf) {

  804.             v->rptfrm = get_bits(gb, 2);

  805.         } else {

  806.             v->tff = get_bits1(gb);

  807.             v->rptfrm = get_bits1(gb);

  808.         }

  809.     }

  810.     if(v->panscanflag) {

  811.         //...

  812.     }

  813.     v->rnd = get_bits1(gb);

  814.     if(v->interlace)

  815.         v->uvsamp = get_bits1(gb);

  816.     if(v->finterpflag) v->interpfrm = get_bits1(gb);

  817.     if(v->s.pict_type == FF_B_TYPE) {

  818.         v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  819.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];

  820.         if(v->bfraction == 0) {

  821.             v->s.pict_type = FF_BI_TYPE; /* XXX: should not happen here */

  822.         }

  823.     }

  824.     pqindex = get_bits(gb, 5);

  825.     if(!pqindex) return -1;

  826.     v->pqindex = pqindex;

  827.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  828.         v->pq = ff_vc1_pquant_table[0][pqindex];

  829.     else

  830.         v->pq = ff_vc1_pquant_table[1][pqindex];

  831. 

  832.     v->pquantizer = 1;

  833.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  834.         v->pquantizer = pqindex < 9;

  835.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  836.         v->pquantizer = 0;

  837.     v->pqindex = pqindex;

  838.     if (pqindex < 9) v->halfpq = get_bits1(gb);

  839.     else v->halfpq = 0;

  840.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  841.         v->pquantizer = get_bits1(gb);

  842.     if(v->postprocflag)

  843.         v->postproc = get_bits(gb, 2);

  844. 

  845.     if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_P_TYPE) v->use_ic = 0;

  846. 

  847.     if(v->parse_only)

  848.         return 0;

  849. 

  850.     switch(v->s.pict_type) {

  851.     case FF_I_TYPE:

  852.     case FF_BI_TYPE:

  853.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  854.         if (status < 0) return -1;

  855.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  856.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  857.         v->condover = CONDOVER_NONE;

  858.         if(v->overlap && v->pq <= 8) {

  859.             v->condover = decode012(gb);

  860.             if(v->condover == CONDOVER_SELECT) {

  861.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  862.                 if (status < 0) return -1;

  863.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  864.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  865.             }

  866.         }

  867.         break;

  868.     case FF_P_TYPE:

  869.         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);

  870.         else v->mvrange = 0;

  871.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  872.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  873.         v->range_x = 1 << (v->k_x - 1);

  874.         v->range_y = 1 << (v->k_y - 1);

  875. 

  876.         if (v->pq < 5) v->tt_index = 0;

  877.         else if(v->pq < 13) v->tt_index = 1;

  878.         else v->tt_index = 2;

  879. 

  880.         lowquant = (v->pq > 12) ? 0 : 1;

  881.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];

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

  883.         {

  884.             int scale, shift, i;

  885.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];

  886.             v->lumscale = get_bits(gb, 6);

  887.             v->lumshift = get_bits(gb, 6);

  888.             /* fill lookup tables for intensity compensation */

  889.             if(!v->lumscale) {

  890.                 scale = -64;

  891.                 shift = (255 - v->lumshift * 2) << 6;

  892.                 if(v->lumshift > 31)

  893.                     shift += 128 << 6;

  894.             } else {

  895.                 scale = v->lumscale + 32;

  896.                 if(v->lumshift > 31)

  897.                     shift = (v->lumshift - 64) << 6;

  898.                 else

  899.                     shift = v->lumshift << 6;

  900.             }

  901.             for(i = 0; i < 256; i++) {

  902.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  903.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  904.             }

  905.             v->use_ic = 1;

  906.         }

  907.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  908.             v->s.quarter_sample = 0;

  909.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  910.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  911.                 v->s.quarter_sample = 0;

  912.             else

  913.                 v->s.quarter_sample = 1;

  914.         } else

  915.             v->s.quarter_sample = 1;

  916.         v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));

  917. 

  918.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  919.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  920.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  921.         {

  922.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  923.             if (status < 0) return -1;

  924.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  925.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  926.         } else {

  927.             v->mv_type_is_raw = 0;

  928.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  929.         }

  930.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  931.         if (status < 0) return -1;

  932.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  933.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  934. 

  935.         /* Hopefully this is correct for P frames */

  936.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  937.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  938.         if (v->dquant)

  939.         {

  940.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  941.             vop_dquant_decoding(v);

  942.         }

  943. 

  944.         v->ttfrm = 0; //FIXME Is that so ?

  945.         if (v->vstransform)

  946.         {

  947.             v->ttmbf = get_bits1(gb);

  948.             if (v->ttmbf)

  949.             {

  950.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  951.             }

  952.         } else {

  953.             v->ttmbf = 1;

  954.             v->ttfrm = TT_8X8;

  955.         }

  956.         break;

  957.     case FF_B_TYPE:

  958.         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);

  959.         else v->mvrange = 0;

  960.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  961.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  962.         v->range_x = 1 << (v->k_x - 1);

  963.         v->range_y = 1 << (v->k_y - 1);

  964. 

  965.         if (v->pq < 5) v->tt_index = 0;

  966.         else if(v->pq < 13) v->tt_index = 1;

  967.         else v->tt_index = 2;

  968. 

  969.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  970.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  971.         v->s.mspel = v->s.quarter_sample;

  972. 

  973.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  974.         if (status < 0) return -1;

  975.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  976.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  977.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  978.         if (status < 0) return -1;

  979.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  980.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  981. 

  982.         v->s.mv_table_index = get_bits(gb, 2);

  983.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  984. 

  985.         if (v->dquant)

  986.         {

  987.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  988.             vop_dquant_decoding(v);

  989.         }

  990. 

  991.         v->ttfrm = 0;

  992.         if (v->vstransform)

  993.         {

  994.             v->ttmbf = get_bits1(gb);

  995.             if (v->ttmbf)

  996.             {

  997.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  998.             }

  999.         } else {

  1000.             v->ttmbf = 1;

  1001.             v->ttfrm = TT_8X8;

  1002.         }

  1003.         break;

  1004.     }

  1005. 

  1006.     /* AC Syntax */

  1007.     v->c_ac_table_index = decode012(gb);

  1008.     if (v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)

  1009.     {

  1010.         v->y_ac_table_index = decode012(gb);

  1011.     }

  1012.     /* DC Syntax */

  1013.     v->s.dc_table_index = get_bits1(gb);

  1014.     if ((v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE) && v->dquant) {

  1015.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1016.         vop_dquant_decoding(v);

  1017.     }

  1018. 

  1019.     v->bi_type = 0;

  1020.     if(v->s.pict_type == FF_BI_TYPE) {

  1021.         v->s.pict_type = FF_B_TYPE;

  1022.         v->bi_type = 1;

  1023.     }

  1024.     return 0;

  1025. }