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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 shall 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.         v->s.dsp.vc1_inv_trans_8x8_dc = ff_simple_idct_add;

  341.         v->s.dsp.vc1_inv_trans_8x4_dc = ff_simple_idct84_add;

  342.         v->s.dsp.vc1_inv_trans_4x8_dc = ff_simple_idct48_add;

  343.         v->s.dsp.vc1_inv_trans_4x4_dc = ff_simple_idct44_add;

  344.     }

  345. 

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

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

  348.     {

  349.         av_log(avctx, AV_LOG_ERROR,

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

  351.         return -1;

  352.     }

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

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

  355.     {

  356.         av_log(avctx, AV_LOG_ERROR,

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

  358.         return -1;

  359.     }

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

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

  362. 

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

  364.     if (v->res_transtab)

  365.     {

  366.         av_log(avctx, AV_LOG_ERROR,

  367.                "1 for reserved RES_TRANSTAB is forbidden\n");

  368.         return -1;

  369.     }

  370. 

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

  372. 

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

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

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

  376.     {

  377.         av_log(avctx, AV_LOG_INFO,

  378.                "RANGERED should be set to 0 in Simple Profile\n");

  379.     }

  380. 

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

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

  383. 

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

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

  386.     if (!v->res_rtm_flag)

  387.     {

  388. //            av_log(avctx, AV_LOG_ERROR,

  389. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  390.         av_log(avctx, AV_LOG_ERROR,

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

  392.         //return -1;

  393.     }

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

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

  396.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  405.                );

  406.     return 0;

  407. }

  408. 

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

  410. {

  411.     v->res_rtm_flag = 1;

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

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

  414.     {

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

  416.     }

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

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

  419.     {

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

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

  422.         return -1;

  423.     }

  424. 

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

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

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

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

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

  430. 

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

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

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

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

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

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

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

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

  439.     skip_bits1(gb); // reserved

  440. 

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

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

  443. 

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

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

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

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

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

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

  450.                v->tfcntrflag, v->finterpflag

  451.                );

  452. 

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

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

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

  456.         return -1;

  457.     }

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

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

  460.         int w, h, ar = 0;

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

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

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

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

  465.         if(get_bits1(gb))

  466.             ar = get_bits(gb, 4);

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

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

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

  470.             w = get_bits(gb, 8);

  471.             h = get_bits(gb, 8);

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

  473.         }

  474.         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);

  475. 

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

  477.             if(get_bits1(gb)) {

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

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

  480.             } else {

  481.                 int nr, dr;

  482.                 nr = get_bits(gb, 8);

  483.                 dr = get_bits(gb, 4);

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

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

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

  487.                 }

  488.             }

  489.         }

  490. 

  491.         if(get_bits1(gb)){

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

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

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

  495.         }

  496.     }

  497. 

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

  499.     if(v->hrd_param_flag) {

  500.         int i;

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

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

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

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

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

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

  507.         }

  508.     }

  509.     return 0;

  510. }

  511. 

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

  513. {

  514.     int i;

  515. 

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

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

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

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

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

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

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

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

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

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

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

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

  528. 

  529.     if(v->hrd_param_flag){

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

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

  532.         }

  533.     }

  534. 

  535.     if(get_bits1(gb)){

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

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

  538.     }

  539.     if(v->extended_mv)

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

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

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

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

  544.     }

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

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

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

  548.     }

  549. 

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

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

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

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

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

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

  556. 

  557.     return 0;

  558. }

  559. 

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

  561. {

  562.     int pqindex, lowquant, status;

  563. 

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

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

  566.     v->rangeredfrm = 0;

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

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

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

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

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

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

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

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

  575. 

  576.     v->bi_type = 0;

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

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

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

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

  581.             v->s.pict_type = FF_BI_TYPE;

  582.         }

  583.     }

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

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

  586. 

  587.     if(v->parse_only)

  588.         return 0;

  589. 

  590.     /* calculate RND */

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

  592.         v->rnd = 1;

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

  594.         v->rnd ^= 1;

  595. 

  596.     /* Quantizer stuff */

  597.     pqindex = get_bits(gb, 5);

  598.     if(!pqindex) return -1;

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

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

  601.     else

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

  603. 

  604.     v->pquantizer = 1;

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

  606.         v->pquantizer = pqindex < 9;

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

  608.         v->pquantizer = 0;

  609.     v->pqindex = pqindex;

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

  611.     else v->halfpq = 0;

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

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

  614.     v->dquantfrm = 0;

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

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

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

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

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

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

  621. 

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

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

  624.     }else v->x8_type = 0;

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

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

  627. 

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

  629. 

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

  631.     case FF_P_TYPE:

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

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

  634.         else v->tt_index = 2;

  635. 

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

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

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

  639.         {

  640.             int scale, shift, i;

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

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

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

  644.             v->use_ic = 1;

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

  646.             if(!v->lumscale) {

  647.                 scale = -64;

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

  649.                 if(v->lumshift > 31)

  650.                     shift += 128 << 6;

  651.             } else {

  652.                 scale = v->lumscale + 32;

  653.                 if(v->lumshift > 31)

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

  655.                 else

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

  657.             }

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

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

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

  661.             }

  662.         }

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

  664.             v->s.quarter_sample = 0;

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

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

  667.                 v->s.quarter_sample = 0;

  668.             else

  669.                 v->s.quarter_sample = 1;

  670.         } else

  671.             v->s.quarter_sample = 1;

  672.         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));

  673. 

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

  675.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

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

  677.         {

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

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

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

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

  682.         } else {

  683.             v->mv_type_is_raw = 0;

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

  685.         }

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

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

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

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

  690. 

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

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

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

  694. 

  695.         if (v->dquant)

  696.         {

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

  698.             vop_dquant_decoding(v);

  699.         }

  700. 

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

  702.         if (v->vstransform)

  703.         {

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

  705.             if (v->ttmbf)

  706.             {

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

  708.             }

  709.         } else {

  710.             v->ttmbf = 1;

  711.             v->ttfrm = TT_8X8;

  712.         }

  713.         break;

  714.     case FF_B_TYPE:

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

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

  717.         else v->tt_index = 2;

  718. 

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

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

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

  722. 

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

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

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

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

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

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

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

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

  731. 

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

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

  734. 

  735.         if (v->dquant)

  736.         {

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

  738.             vop_dquant_decoding(v);

  739.         }

  740. 

  741.         v->ttfrm = 0;

  742.         if (v->vstransform)

  743.         {

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

  745.             if (v->ttmbf)

  746.             {

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

  748.             }

  749.         } else {

  750.             v->ttmbf = 1;

  751.             v->ttfrm = TT_8X8;

  752.         }

  753.         break;

  754.     }

  755. 

  756.     if(!v->x8_type)

  757.     {

  758.         /* AC Syntax */

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

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

  761.         {

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

  763.         }

  764.         /* DC Syntax */

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

  766.     }

  767. 

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

  769.         v->s.pict_type = FF_B_TYPE;

  770.         v->bi_type = 1;

  771.     }

  772.     return 0;

  773. }

  774. 

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

  776. {

  777.     int pqindex, lowquant;

  778.     int status;

  779. 

  780.     v->p_frame_skipped = 0;

  781. 

  782.     if(v->interlace){

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

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

  785.     }

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

  787.     case 0:

  788.         v->s.pict_type = FF_P_TYPE;

  789.         break;

  790.     case 1:

  791.         v->s.pict_type = FF_B_TYPE;

  792.         break;

  793.     case 2:

  794.         v->s.pict_type = FF_I_TYPE;

  795.         break;

  796.     case 3:

  797.         v->s.pict_type = FF_BI_TYPE;

  798.         break;

  799.     case 4:

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

  801.         v->p_frame_skipped = 1;

  802.         return 0;

  803.     }

  804.     if(v->tfcntrflag)

  805.         skip_bits(gb, 8);

  806.     if(v->broadcast) {

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

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

  809.         } else {

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

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

  812.         }

  813.     }

  814.     if(v->panscanflag) {

  815.         //...

  816.     }

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

  818.     if(v->interlace)

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

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

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

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

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

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

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

  826.         }

  827.     }

  828.     pqindex = get_bits(gb, 5);

  829.     if(!pqindex) return -1;

  830.     v->pqindex = pqindex;

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

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

  833.     else

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

  835. 

  836.     v->pquantizer = 1;

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

  838.         v->pquantizer = pqindex < 9;

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

  840.         v->pquantizer = 0;

  841.     v->pqindex = pqindex;

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

  843.     else v->halfpq = 0;

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

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

  846.     if(v->postprocflag)

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

  848. 

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

  850. 

  851.     if(v->parse_only)

  852.         return 0;

  853. 

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

  855.     case FF_I_TYPE:

  856.     case FF_BI_TYPE:

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

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

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

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

  861.         v->condover = CONDOVER_NONE;

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

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

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

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

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

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

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

  869.             }

  870.         }

  871.         break;

  872.     case FF_P_TYPE:

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

  874.         else v->mvrange = 0;

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

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

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

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

  879. 

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

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

  882.         else v->tt_index = 2;

  883. 

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

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

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

  887.         {

  888.             int scale, shift, i;

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

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

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

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

  893.             if(!v->lumscale) {

  894.                 scale = -64;

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

  896.                 if(v->lumshift > 31)

  897.                     shift += 128 << 6;

  898.             } else {

  899.                 scale = v->lumscale + 32;

  900.                 if(v->lumshift > 31)

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

  902.                 else

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

  904.             }

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

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

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

  908.             }

  909.             v->use_ic = 1;

  910.         }

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

  912.             v->s.quarter_sample = 0;

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

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

  915.                 v->s.quarter_sample = 0;

  916.             else

  917.                 v->s.quarter_sample = 1;

  918.         } else

  919.             v->s.quarter_sample = 1;

  920.         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));

  921. 

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

  923.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

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

  925.         {

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

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

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

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

  930.         } else {

  931.             v->mv_type_is_raw = 0;

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

  933.         }

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

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

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

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

  938. 

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

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

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

  942.         if (v->dquant)

  943.         {

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

  945.             vop_dquant_decoding(v);

  946.         }

  947. 

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

  949.         if (v->vstransform)

  950.         {

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

  952.             if (v->ttmbf)

  953.             {

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

  955.             }

  956.         } else {

  957.             v->ttmbf = 1;

  958.             v->ttfrm = TT_8X8;

  959.         }

  960.         break;

  961.     case FF_B_TYPE:

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

  963.         else v->mvrange = 0;

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

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

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

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

  968. 

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

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

  971.         else v->tt_index = 2;

  972. 

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

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

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

  976. 

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

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

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

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

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

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

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

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

  985. 

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

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

  988. 

  989.         if (v->dquant)

  990.         {

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

  992.             vop_dquant_decoding(v);

  993.         }

  994. 

  995.         v->ttfrm = 0;

  996.         if (v->vstransform)

  997.         {

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

  999.             if (v->ttmbf)

  1000.             {

  1001.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1002.             }

  1003.         } else {

  1004.             v->ttmbf = 1;

  1005.             v->ttfrm = TT_8X8;

  1006.         }

  1007.         break;

  1008.     }

  1009. 

  1010.     /* AC Syntax */

  1011.     v->c_ac_table_index = decode012(gb);

  1012.     if (v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)

  1013.     {

  1014.         v->y_ac_table_index = decode012(gb);

  1015.     }

  1016.     /* DC Syntax */

  1017.     v->s.dc_table_index = get_bits1(gb);

  1018.     if ((v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE) && v->dquant) {

  1019.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1020.         vop_dquant_decoding(v);

  1021.     }

  1022. 

  1023.     v->bi_type = 0;

  1024.     if(v->s.pict_type == FF_BI_TYPE) {

  1025.         v->s.pict_type = FF_B_TYPE;

  1026.         v->bi_type = 1;

  1027.     }

  1028.     return 0;

  1029. }