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FFmpeg/libavcodec/vc1.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

  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 vc1.c

  25.  * VC-1 and WMV3 decoder

  26.  *

  27.  */

  28. #include "dsputil.h"

  29. #include "avcodec.h"

  30. #include "mpegvideo.h"

  31. #include "vc1.h"

  32. #include "vc1data.h"

  33. #include "vc1acdata.h"

  34. #include "msmpeg4data.h"

  35. 

  36. #undef NDEBUG

  37. #include <assert.h>

  38. 

  39. #define MB_INTRA_VLC_BITS 9

  40. #define DC_VLC_BITS 9

  41. #define AC_VLC_BITS 9

  42. static const uint16_t table_mb_intra[64][2];

  43. 

  44. 

  45. /**

  46.  * Get unary code of limited length

  47.  * @fixme FIXME Slow and ugly

  48.  * @param gb GetBitContext

  49.  * @param[in] stop The bitstop value (unary code of 1's or 0's)

  50.  * @param[in] len Maximum length

  51.  * @return Unary length/index

  52.  */

  53. static int get_prefix(GetBitContext *gb, int stop, int len)

  54. {

  55. #if 1

  56.     int i;

  57. 

  58.     for(i = 0; i < len && get_bits1(gb) != stop; i++);

  59.     return i;

  60. /*  int i = 0, tmp = !stop;

  61. 

  62.   while (i != len && tmp != stop)

  63.   {

  64.     tmp = get_bits(gb, 1);

  65.     i++;

  66.   }

  67.   if (i == len && tmp != stop) return len+1;

  68.   return i;*/

  69. #else

  70.   unsigned int buf;

  71.   int log;

  72. 

  73.   OPEN_READER(re, gb);

  74.   UPDATE_CACHE(re, gb);

  75.   buf=GET_CACHE(re, gb); //Still not sure

  76.   if (stop) buf = ~buf;

  77. 

  78.   log= av_log2(-buf); //FIXME: -?

  79.   if (log < limit){

  80.     LAST_SKIP_BITS(re, gb, log+1);

  81.     CLOSE_READER(re, gb);

  82.     return log;

  83.   }

  84. 

  85.   LAST_SKIP_BITS(re, gb, limit);

  86.   CLOSE_READER(re, gb);

  87.   return limit;

  88. #endif

  89. }

  90. 

  91. static inline int decode210(GetBitContext *gb){

  92.     int n;

  93.     n = get_bits1(gb);

  94.     if (n == 1)

  95.         return 0;

  96.     else

  97.         return 2 - get_bits1(gb);

  98. }

  99. 

  100. /**

  101.  * Init VC-1 specific tables and VC1Context members

  102.  * @param v The VC1Context to initialize

  103.  * @return Status

  104.  */

  105. static int vc1_init_common(VC1Context *v)

  106. {

  107.     static int done = 0;

  108.     int i = 0;

  109. 

  110.     v->hrd_rate = v->hrd_buffer = NULL;

  111. 

  112.     /* VLC tables */

  113.     if(!done)

  114.     {

  115.         done = 1;

  116.         init_vlc(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  117.                  ff_vc1_bfraction_bits, 1, 1,

  118.                  ff_vc1_bfraction_codes, 1, 1, 1);

  119.         init_vlc(&ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  120.                  ff_vc1_norm2_bits, 1, 1,

  121.                  ff_vc1_norm2_codes, 1, 1, 1);

  122.         init_vlc(&ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  123.                  ff_vc1_norm6_bits, 1, 1,

  124.                  ff_vc1_norm6_codes, 2, 2, 1);

  125.         init_vlc(&ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  126.                  ff_vc1_imode_bits, 1, 1,

  127.                  ff_vc1_imode_codes, 1, 1, 1);

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

  129.         {

  130.             init_vlc(&ff_vc1_ttmb_vlc[i], VC1_TTMB_VLC_BITS, 16,

  131.                      ff_vc1_ttmb_bits[i], 1, 1,

  132.                      ff_vc1_ttmb_codes[i], 2, 2, 1);

  133.             init_vlc(&ff_vc1_ttblk_vlc[i], VC1_TTBLK_VLC_BITS, 8,

  134.                      ff_vc1_ttblk_bits[i], 1, 1,

  135.                      ff_vc1_ttblk_codes[i], 1, 1, 1);

  136.             init_vlc(&ff_vc1_subblkpat_vlc[i], VC1_SUBBLKPAT_VLC_BITS, 15,

  137.                      ff_vc1_subblkpat_bits[i], 1, 1,

  138.                      ff_vc1_subblkpat_codes[i], 1, 1, 1);

  139.         }

  140.         for(i=0; i<4; i++)

  141.         {

  142.             init_vlc(&ff_vc1_4mv_block_pattern_vlc[i], VC1_4MV_BLOCK_PATTERN_VLC_BITS, 16,

  143.                      ff_vc1_4mv_block_pattern_bits[i], 1, 1,

  144.                      ff_vc1_4mv_block_pattern_codes[i], 1, 1, 1);

  145.             init_vlc(&ff_vc1_cbpcy_p_vlc[i], VC1_CBPCY_P_VLC_BITS, 64,

  146.                      ff_vc1_cbpcy_p_bits[i], 1, 1,

  147.                      ff_vc1_cbpcy_p_codes[i], 2, 2, 1);

  148.             init_vlc(&ff_vc1_mv_diff_vlc[i], VC1_MV_DIFF_VLC_BITS, 73,

  149.                      ff_vc1_mv_diff_bits[i], 1, 1,

  150.                      ff_vc1_mv_diff_codes[i], 2, 2, 1);

  151.         }

  152.         for(i=0; i<8; i++)

  153.             init_vlc(&ff_vc1_ac_coeff_table[i], AC_VLC_BITS, vc1_ac_sizes[i],

  154.                      &vc1_ac_tables[i][0][1], 8, 4,

  155.                      &vc1_ac_tables[i][0][0], 8, 4, 1);

  156.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

  157.                  &ff_msmp4_mb_i_table[0][1], 4, 2,

  158.                  &ff_msmp4_mb_i_table[0][0], 4, 2, 1);

  159.     }

  160. 

  161.     /* Other defaults */

  162.     v->pq = -1;

  163.     v->mvrange = 0; /* 7.1.1.18, p80 */

  164. 

  165.     return 0;

  166. }

  167. 

  168. /***********************************************************************/

  169. /**

  170.  * @defgroup bitplane VC9 Bitplane decoding

  171.  * @see 8.7, p56

  172.  * @{

  173.  */

  174. 

  175. /** @addtogroup bitplane

  176.  * Imode types

  177.  * @{

  178.  */

  179. enum Imode {

  180.     IMODE_RAW,

  181.     IMODE_NORM2,

  182.     IMODE_DIFF2,

  183.     IMODE_NORM6,

  184.     IMODE_DIFF6,

  185.     IMODE_ROWSKIP,

  186.     IMODE_COLSKIP

  187. };

  188. /** @} */ //imode defines

  189. 

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

  191.  * @param plane Buffer to store decoded bits

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

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

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

  195.  */

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

  197.     int x, y;

  198. 

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

  200.         if (!get_bits(gb, 1)) //rowskip

  201.             memset(plane, 0, width);

  202.         else

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

  204.                 plane[x] = get_bits(gb, 1);

  205.         plane += stride;

  206.     }

  207. }

  208. 

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

  210.  * @param plane Buffer to store decoded bits

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

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

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

  214.  * @fixme FIXME: Optimize

  215.  */

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

  217.     int x, y;

  218. 

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

  220.         if (!get_bits(gb, 1)) //colskip

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

  222.                 plane[y*stride] = 0;

  223.         else

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

  225.                 plane[y*stride] = get_bits(gb, 1);

  226.         plane ++;

  227.     }

  228. }

  229. 

  230. /** Decode a bitplane's bits

  231.  * @param bp Bitplane where to store the decode bits

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

  233.  * @return Status

  234.  * @fixme FIXME: Optimize

  235.  */

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

  237. {

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

  239. 

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

  241.     uint8_t invert, *planep = data;

  242.     int width, height, stride;

  243. 

  244.     width = v->s.mb_width;

  245.     height = v->s.mb_height;

  246.     stride = v->s.mb_stride;

  247.     invert = get_bits(gb, 1);

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

  249. 

  250.     *raw_flag = 0;

  251.     switch (imode)

  252.     {

  253.     case IMODE_RAW:

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

  255.         *raw_flag = 1; //invert ignored

  256.         return invert;

  257.     case IMODE_DIFF2:

  258.     case IMODE_NORM2:

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

  260.         {

  261.             *planep++ = get_bits(gb, 1);

  262.             offset = 1;

  263.         }

  264.         else offset = 0;

  265.         // decode bitplane as one long line

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

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

  268.             *planep++ = code & 1;

  269.             offset++;

  270.             if(offset == width) {

  271.                 offset = 0;

  272.                 planep += stride - width;

  273.             }

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

  275.             offset++;

  276.             if(offset == width) {

  277.                 offset = 0;

  278.                 planep += stride - width;

  279.             }

  280.         }

  281.         break;

  282.     case IMODE_DIFF6:

  283.     case IMODE_NORM6:

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

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

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

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

  288.                     if(code < 0){

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

  290.                         return -1;

  291.                     }

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

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

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

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

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

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

  298.                 }

  299.                 planep += stride * 3;

  300.             }

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

  302.         } else { // 3x2

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

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

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

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

  307.                     if(code < 0){

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

  309.                         return -1;

  310.                     }

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

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

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

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

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

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

  317.                 }

  318.                 planep += stride * 2;

  319.             }

  320.             x = width % 3;

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

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

  323.         }

  324.         break;

  325.     case IMODE_ROWSKIP:

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

  327.         break;

  328.     case IMODE_COLSKIP:

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

  330.         break;

  331.     default: break;

  332.     }

  333. 

  334.     /* Applying diff operator */

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

  336.     {

  337.         planep = data;

  338.         planep[0] ^= invert;

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

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

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

  342.         {

  343.             planep += stride;

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

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

  346.             {

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

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

  349.             }

  350.         }

  351.     }

  352.     else if (invert)

  353.     {

  354.         planep = data;

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

  356.     }

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

  358. }

  359. 

  360. /** @} */ //Bitplane group

  361. 

  362. /***********************************************************************/

  363. /** VOP Dquant decoding

  364.  * @param v VC-1 Context

  365.  */

  366. static int vop_dquant_decoding(VC1Context *v)

  367. {

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

  369.     int pqdiff;

  370. 

  371.     //variable size

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

  373.     {

  374.         pqdiff = get_bits(gb, 3);

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

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

  377.     }

  378.     else

  379.     {

  380.         v->dquantfrm = get_bits(gb, 1);

  381.         if ( v->dquantfrm )

  382.         {

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

  384.             switch (v->dqprofile)

  385.             {

  386.             case DQPROFILE_SINGLE_EDGE:

  387.             case DQPROFILE_DOUBLE_EDGES:

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

  389.                 break;

  390.             case DQPROFILE_ALL_MBS:

  391.                 v->dqbilevel = get_bits(gb, 1);

  392.             default: break; //Forbidden ?

  393.             }

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

  395.             {

  396.                 pqdiff = get_bits(gb, 3);

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

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

  399.             }

  400.         }

  401.     }

  402.     return 0;

  403. }

  404. 

  405. /** Put block onto picture

  406.  */

  407. static void vc1_put_block(VC1Context *v, DCTELEM block[6][64])

  408. {

  409.     uint8_t *Y;

  410.     int ys, us, vs;

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

  412. 

  413.     if(v->rangeredfrm) {

  414.         int i, j, k;

  415.         for(k = 0; k < 6; k++)

  416.             for(j = 0; j < 8; j++)

  417.                 for(i = 0; i < 8; i++)

  418.                     block[k][i + j*8] = ((block[k][i + j*8] - 128) << 1) + 128;

  419. 

  420.     }

  421.     ys = v->s.current_picture.linesize[0];

  422.     us = v->s.current_picture.linesize[1];

  423.     vs = v->s.current_picture.linesize[2];

  424.     Y = v->s.dest[0];

  425. 

  426.     dsp->put_pixels_clamped(block[0], Y, ys);

  427.     dsp->put_pixels_clamped(block[1], Y + 8, ys);

  428.     Y += ys * 8;

  429.     dsp->put_pixels_clamped(block[2], Y, ys);

  430.     dsp->put_pixels_clamped(block[3], Y + 8, ys);

  431. 

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

  433.         dsp->put_pixels_clamped(block[4], v->s.dest[1], us);

  434.         dsp->put_pixels_clamped(block[5], v->s.dest[2], vs);

  435.     }

  436. }

  437. 

  438. /** Do motion compensation over 1 macroblock

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

  440.  */

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

  442. {

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

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

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

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

  447. 

  448.     if(!v->s.last_picture.data[0])return;

  449. 

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

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

  452. 

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

  454.     if(s->pict_type == P_TYPE) {

  455.         s->current_picture.motion_val[1][s->block_index[0]][0] = mx;

  456.         s->current_picture.motion_val[1][s->block_index[0]][1] = my;

  457.     }

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

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

  460.     if(v->fastuvmc) {

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

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

  463.     }

  464.     if(!dir) {

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

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

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

  468.     } else {

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

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

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

  472.     }

  473. 

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

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

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

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

  478. 

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

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

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

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

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

  484.     }else{

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

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

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

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

  489.     }

  490. 

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

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

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

  494. 

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

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

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

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

  499.     }

  500. 

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

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

  503.        || (unsigned)(src_y - s->mspel) > s->v_edge_pos - (my&3) - 16 - s->mspel*3){

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

  505. 

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

  507.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  508.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  509.         srcY = s->edge_emu_buffer;

  510.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

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

  512.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

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

  514.         srcU = uvbuf;

  515.         srcV = uvbuf + 16;

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

  517.         if(v->rangeredfrm) {

  518.             int i, j;

  519.             uint8_t *src, *src2;

  520. 

  521.             src = srcY;

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

  523.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  524.                 src += s->linesize;

  525.             }

  526.             src = srcU; src2 = srcV;

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

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

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

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

  531.                 }

  532.                 src += s->uvlinesize;

  533.                 src2 += s->uvlinesize;

  534.             }

  535.         }

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

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

  538.             int i, j;

  539.             uint8_t *src, *src2;

  540. 

  541.             src = srcY;

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

  543.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = v->luty[src[i]];

  544.                 src += s->linesize;

  545.             }

  546.             src = srcU; src2 = srcV;

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

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

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

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

  551.                 }

  552.                 src += s->uvlinesize;

  553.                 src2 += s->uvlinesize;

  554.             }

  555.         }

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

  557.     }

  558. 

  559.     if(s->mspel) {

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

  561.         dsp->put_vc1_mspel_pixels_tab[dxy](s->dest[0]    , srcY    , s->linesize, v->rnd);

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

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

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

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

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

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

  568. 

  569.         if(!v->rnd)

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

  571.         else

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

  573.     }

  574. 

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

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

  577.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

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

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

  580.     if(!v->rnd){

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

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

  583.     }else{

  584.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  585.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  586.     }

  587. }

  588. 

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

  590.  */

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

  592. {

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

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

  595.     uint8_t *srcY;

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

  597.     int off;

  598. 

  599.     if(!v->s.last_picture.data[0])return;

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

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

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

  603. 

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

  605. 

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

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

  608. 

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

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

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

  612.     }else{

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

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

  615.     }

  616. 

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

  618. 

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

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

  621.        || (unsigned)(src_y - s->mspel) > s->v_edge_pos - (my&3) - 8 - s->mspel*2){

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

  623.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 9+s->mspel*2, 9+s->mspel*2,

  624.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  625.         srcY = s->edge_emu_buffer;

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

  627.         if(v->rangeredfrm) {

  628.             int i, j;

  629.             uint8_t *src;

  630. 

  631.             src = srcY;

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

  633.                 for(i = 0; i < 9 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  634.                 src += s->linesize;

  635.             }

  636.         }

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

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

  639.             int i, j;

  640.             uint8_t *src;

  641. 

  642.             src = srcY;

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

  644.                 for(i = 0; i < 9 + s->mspel*2; i++) src[i] = v->luty[src[i]];

  645.                 src += s->linesize;

  646.             }

  647.         }

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

  649.     }

  650. 

  651.     if(s->mspel) {

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

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

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

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

  656.         if(!v->rnd)

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

  658.         else

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

  660.     }

  661. }

  662. 

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

  664. {

  665.     if(a < b) {

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

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

  668.     } else {

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

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

  671.     }

  672. }

  673. 

  674. 

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

  676.  */

  677. static void vc1_mc_4mv_chroma(VC1Context *v)

  678. {

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

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

  681.     uint8_t *srcU, *srcV;

  682.     int uvdxy, uvmx, uvmy, uvsrc_x, uvsrc_y;

  683.     int i, idx, tx = 0, ty = 0;

  684.     int mvx[4], mvy[4], intra[4];

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

  686. 

  687.     if(!v->s.last_picture.data[0])return;

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

  689. 

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

  691.         mvx[i] = s->mv[0][i][0];

  692.         mvy[i] = s->mv[0][i][1];

  693.         intra[i] = v->mb_type[0][s->block_index[i]];

  694.     }

  695. 

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

  697.     idx = (intra[3] << 3) | (intra[2] << 2) | (intra[1] << 1) | intra[0];

  698.     if(!idx) { // all blocks are inter

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

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

  701.     } else if(count[idx] == 1) { // 3 inter blocks

  702.         switch(idx) {

  703.         case 0x1:

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

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

  706.             break;

  707.         case 0x2:

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

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

  710.             break;

  711.         case 0x4:

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

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

  714.             break;

  715.         case 0x8:

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

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

  718.             break;

  719.         }

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

  721.         int t1 = 0, t2 = 0;

  722.         for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}

  723.         for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}

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

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

  726.     } else {

  727.         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  728.         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  729.         return; //no need to do MC for inter blocks

  730.     }

  731. 

  732.     s->current_picture.motion_val[1][s->block_index[0]][0] = tx;

  733.     s->current_picture.motion_val[1][s->block_index[0]][1] = ty;

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

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

  736.     if(v->fastuvmc) {

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

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

  739.     }

  740. 

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

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

  743. 

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

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

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

  747.     }else{

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

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

  750.     }

  751. 

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

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

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

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

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

  757.         ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,

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

  759.         ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,

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

  761.         srcU = s->edge_emu_buffer;

  762.         srcV = s->edge_emu_buffer + 16;

  763. 

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

  765.         if(v->rangeredfrm) {

  766.             int i, j;

  767.             uint8_t *src, *src2;

  768. 

  769.             src = srcU; src2 = srcV;

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

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

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

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

  774.                 }

  775.                 src += s->uvlinesize;

  776.                 src2 += s->uvlinesize;

  777.             }

  778.         }

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

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

  781.             int i, j;

  782.             uint8_t *src, *src2;

  783. 

  784.             src = srcU; src2 = srcV;

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

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

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

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

  789.                 }

  790.                 src += s->uvlinesize;

  791.                 src2 += s->uvlinesize;

  792.             }

  793.         }

  794.     }

  795. 

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

  797.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

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

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

  800.     if(!v->rnd){

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

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

  803.     }else{

  804.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  805.         dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  806.     }

  807. }

  808. 

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

  810. 

  811. /**

  812.  * Decode Simple/Main Profiles sequence header

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

  814.  * @param avctx Codec context

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

  816.  * @return Status

  817.  */

  818. static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)

  819. {

  820.     VC1Context *v = avctx->priv_data;

  821. 

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

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

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

  825.     {

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

  827.     }

  828. 

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

  830.     {

  831.         return decode_sequence_header_adv(v, gb);

  832.     }

  833.     else

  834.     {

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

  836.         if (v->res_sm)

  837.         {

  838.             av_log(avctx, AV_LOG_ERROR,

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

  840.             return -1;

  841.         }

  842.     }

  843. 

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

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

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

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

  848.     v->s.loop_filter = get_bits(gb, 1); //common

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

  850.     {

  851.         av_log(avctx, AV_LOG_ERROR,

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

  853.     }

  854. 

  855.     v->res_x8 = get_bits(gb, 1); //reserved

  856.     if (v->res_x8)

  857.     {

  858.         av_log(avctx, AV_LOG_ERROR,

  859.                "1 for reserved RES_X8 is forbidden\n");

  860.         //return -1;

  861.     }

  862.     v->multires = get_bits(gb, 1);

  863.     v->res_fasttx = get_bits(gb, 1);

  864.     if (!v->res_fasttx)

  865.     {

  866.         av_log(avctx, AV_LOG_ERROR,

  867.                "0 for reserved RES_FASTTX is forbidden\n");

  868.         //return -1;

  869.     }

  870. 

  871.     v->fastuvmc =  get_bits(gb, 1); //common

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

  873.     {

  874.         av_log(avctx, AV_LOG_ERROR,

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

  876.         return -1;

  877.     }

  878.     v->extended_mv =  get_bits(gb, 1); //common

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

  880.     {

  881.         av_log(avctx, AV_LOG_ERROR,

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

  883.         return -1;

  884.     }

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

  886.     v->vstransform =  get_bits(gb, 1); //common

  887. 

  888.     v->res_transtab = get_bits(gb, 1);

  889.     if (v->res_transtab)

  890.     {

  891.         av_log(avctx, AV_LOG_ERROR,

  892.                "1 for reserved RES_TRANSTAB is forbidden\n");

  893.         return -1;

  894.     }

  895. 

  896.     v->overlap = get_bits(gb, 1); //common

  897. 

  898.     v->s.resync_marker = get_bits(gb, 1);

  899.     v->rangered = get_bits(gb, 1);

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

  901.     {

  902.         av_log(avctx, AV_LOG_INFO,

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

  904.     }

  905. 

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

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

  908. 

  909.     v->finterpflag = get_bits(gb, 1); //common

  910.     v->res_rtm_flag = get_bits(gb, 1); //reserved

  911.     if (!v->res_rtm_flag)

  912.     {

  913. //            av_log(avctx, AV_LOG_ERROR,

  914. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  915.         av_log(avctx, AV_LOG_ERROR,

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

  917.         //return -1;

  918.     }

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

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

  921.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  930.                );

  931.     return 0;

  932. }

  933. 

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

  935. {

  936.     v->res_rtm_flag = 1;

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

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

  939.     {

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

  941.     }

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

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

  944.     {

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

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

  947.         return -1;

  948.     }

  949. 

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

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

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

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

  954.     v->postprocflag = get_bits(gb, 1); //common

  955. 

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

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

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

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

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

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

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

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

  964.     get_bits1(gb); // reserved

  965. 

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

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

  968. 

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

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

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

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

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

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

  975.                v->tfcntrflag, v->finterpflag

  976.                );

  977. 

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

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

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

  981.         return -1;

  982.     }

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

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

  985.         int w, h, ar = 0;

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

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

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

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

  990.         if(get_bits1(gb))

  991.             ar = get_bits(gb, 4);

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

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

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

  995.             w = get_bits(gb, 8);

  996.             h = get_bits(gb, 8);

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

  998.         }

  999. 

  1000.         if(get_bits1(gb)){ //framerate stuff

  1001.             if(get_bits1(gb)) {

  1002.                 v->s.avctx->time_base.num = 32;

  1003.                 v->s.avctx->time_base.den = get_bits(gb, 16) + 1;

  1004.             } else {

  1005.                 int nr, dr;

  1006.                 nr = get_bits(gb, 8);

  1007.                 dr = get_bits(gb, 4);

  1008.                 if(nr && nr < 8 && dr && dr < 3){

  1009.                     v->s.avctx->time_base.num = ff_vc1_fps_dr[dr - 1];

  1010.                     v->s.avctx->time_base.den = ff_vc1_fps_nr[nr - 1] * 1000;

  1011.                 }

  1012.             }

  1013.         }

  1014. 

  1015.         if(get_bits1(gb)){

  1016.             v->color_prim = get_bits(gb, 8);

  1017.             v->transfer_char = get_bits(gb, 8);

  1018.             v->matrix_coef = get_bits(gb, 8);

  1019.         }

  1020.     }

  1021. 

  1022.     v->hrd_param_flag = get_bits1(gb);

  1023.     if(v->hrd_param_flag) {

  1024.         int i;

  1025.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  1026.         get_bits(gb, 4); //bitrate exponent

  1027.         get_bits(gb, 4); //buffer size exponent

  1028.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1029.             get_bits(gb, 16); //hrd_rate[n]

  1030.             get_bits(gb, 16); //hrd_buffer[n]

  1031.         }

  1032.     }

  1033.     return 0;

  1034. }

  1035. 

  1036. static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)

  1037. {

  1038.     VC1Context *v = avctx->priv_data;

  1039.     int i, blink, clentry, refdist;

  1040. 

  1041.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  1042.     blink = get_bits1(gb); // broken link

  1043.     clentry = get_bits1(gb); // closed entry

  1044.     v->panscanflag = get_bits1(gb);

  1045.     refdist = get_bits1(gb); // refdist flag

  1046.     v->s.loop_filter = get_bits1(gb);

  1047.     v->fastuvmc = get_bits1(gb);

  1048.     v->extended_mv = get_bits1(gb);

  1049.     v->dquant = get_bits(gb, 2);

  1050.     v->vstransform = get_bits1(gb);

  1051.     v->overlap = get_bits1(gb);

  1052.     v->quantizer_mode = get_bits(gb, 2);

  1053. 

  1054.     if(v->hrd_param_flag){

  1055.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1056.             get_bits(gb, 8); //hrd_full[n]

  1057.         }

  1058.     }

  1059. 

  1060.     if(get_bits1(gb)){

  1061.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

  1062.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1063.     }

  1064.     if(v->extended_mv)

  1065.         v->extended_dmv = get_bits1(gb);

  1066.     if(get_bits1(gb)) {

  1067.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1068.         skip_bits(gb, 3); // Y range, ignored for now

  1069.     }

  1070.     if(get_bits1(gb)) {

  1071.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1072.         skip_bits(gb, 3); // UV range, ignored for now

  1073.     }

  1074. 

  1075.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1076.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1077.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1078.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1079.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1080.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1081. 

  1082.     return 0;

  1083. }

  1084. 

  1085. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1086. {

  1087.     int pqindex, lowquant, status;

  1088. 

  1089.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1090.     skip_bits(gb, 2); //framecnt unused

  1091.     v->rangeredfrm = 0;

  1092.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1093.     v->s.pict_type = get_bits(gb, 1);

  1094.     if (v->s.avctx->max_b_frames) {

  1095.         if (!v->s.pict_type) {

  1096.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1097.             else v->s.pict_type = B_TYPE;

  1098.         } else v->s.pict_type = P_TYPE;

  1099.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1100. 

  1101.     v->bi_type = 0;

  1102.     if(v->s.pict_type == B_TYPE) {

  1103.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1104.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1105.         if(v->bfraction == 0) {

  1106.             v->s.pict_type = BI_TYPE;

  1107.         }

  1108.     }

  1109.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1110.         get_bits(gb, 7); // skip buffer fullness

  1111. 

  1112.     /* calculate RND */

  1113.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1114.         v->rnd = 1;

  1115.     if(v->s.pict_type == P_TYPE)

  1116.         v->rnd ^= 1;

  1117. 

  1118.     /* Quantizer stuff */

  1119.     pqindex = get_bits(gb, 5);

  1120.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1121.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1122.     else

  1123.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1124. 

  1125.     v->pquantizer = 1;

  1126.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1127.         v->pquantizer = pqindex < 9;

  1128.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1129.         v->pquantizer = 0;

  1130.     v->pqindex = pqindex;

  1131.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1132.     else v->halfpq = 0;

  1133.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1134.         v->pquantizer = get_bits(gb, 1);

  1135.     v->dquantfrm = 0;

  1136.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1137.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1138.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1139.     v->range_x = 1 << (v->k_x - 1);

  1140.     v->range_y = 1 << (v->k_y - 1);

  1141.     if (v->profile == PROFILE_ADVANCED)

  1142.     {

  1143.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1144.     }

  1145.     else

  1146.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1147. 

  1148.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1149.         if(get_bits1(gb))return -1;

  1150.     }

  1151. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1152. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1153. 

  1154.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1155. 

  1156.     switch(v->s.pict_type) {

  1157.     case P_TYPE:

  1158.         if (v->pq < 5) v->tt_index = 0;

  1159.         else if(v->pq < 13) v->tt_index = 1;

  1160.         else v->tt_index = 2;

  1161. 

  1162.         lowquant = (v->pq > 12) ? 0 : 1;

  1163.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1164.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1165.         {

  1166.             int scale, shift, i;

  1167.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1168.             v->lumscale = get_bits(gb, 6);

  1169.             v->lumshift = get_bits(gb, 6);

  1170.             v->use_ic = 1;

  1171.             /* fill lookup tables for intensity compensation */

  1172.             if(!v->lumscale) {

  1173.                 scale = -64;

  1174.                 shift = (255 - v->lumshift * 2) << 6;

  1175.                 if(v->lumshift > 31)

  1176.                     shift += 128 << 6;

  1177.             } else {

  1178.                 scale = v->lumscale + 32;

  1179.                 if(v->lumshift > 31)

  1180.                     shift = (v->lumshift - 64) << 6;

  1181.                 else

  1182.                     shift = v->lumshift << 6;

  1183.             }

  1184.             for(i = 0; i < 256; i++) {

  1185.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1186.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1187.             }

  1188.         }

  1189.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1190.             v->s.quarter_sample = 0;

  1191.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1192.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1193.                 v->s.quarter_sample = 0;

  1194.             else

  1195.                 v->s.quarter_sample = 1;

  1196.         } else

  1197.             v->s.quarter_sample = 1;

  1198.         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));

  1199. 

  1200.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1201.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1202.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1203.         {

  1204.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1205.             if (status < 0) return -1;

  1206.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1207.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1208.         } else {

  1209.             v->mv_type_is_raw = 0;

  1210.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1211.         }

  1212.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1213.         if (status < 0) return -1;

  1214.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1215.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1216. 

  1217.         /* Hopefully this is correct for P frames */

  1218.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1219.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1220. 

  1221.         if (v->dquant)

  1222.         {

  1223.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1224.             vop_dquant_decoding(v);

  1225.         }

  1226. 

  1227.         v->ttfrm = 0; //FIXME Is that so ?

  1228.         if (v->vstransform)

  1229.         {

  1230.             v->ttmbf = get_bits(gb, 1);

  1231.             if (v->ttmbf)

  1232.             {

  1233.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1234.             }

  1235.         } else {

  1236.             v->ttmbf = 1;

  1237.             v->ttfrm = TT_8X8;

  1238.         }

  1239.         break;

  1240.     case B_TYPE:

  1241.         if (v->pq < 5) v->tt_index = 0;

  1242.         else if(v->pq < 13) v->tt_index = 1;

  1243.         else v->tt_index = 2;

  1244. 

  1245.         lowquant = (v->pq > 12) ? 0 : 1;

  1246.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1247.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1248.         v->s.mspel = v->s.quarter_sample;

  1249. 

  1250.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1251.         if (status < 0) return -1;

  1252.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1253.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1254.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1255.         if (status < 0) return -1;

  1256.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1257.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1258. 

  1259.         v->s.mv_table_index = get_bits(gb, 2);

  1260.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1261. 

  1262.         if (v->dquant)

  1263.         {

  1264.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1265.             vop_dquant_decoding(v);

  1266.         }

  1267. 

  1268.         v->ttfrm = 0;

  1269.         if (v->vstransform)

  1270.         {

  1271.             v->ttmbf = get_bits(gb, 1);

  1272.             if (v->ttmbf)

  1273.             {

  1274.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1275.             }

  1276.         } else {

  1277.             v->ttmbf = 1;

  1278.             v->ttfrm = TT_8X8;

  1279.         }

  1280.         break;

  1281.     }

  1282. 

  1283.     /* AC Syntax */

  1284.     v->c_ac_table_index = decode012(gb);

  1285.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1286.     {

  1287.         v->y_ac_table_index = decode012(gb);

  1288.     }

  1289.     /* DC Syntax */

  1290.     v->s.dc_table_index = get_bits(gb, 1);

  1291. 

  1292.     if(v->s.pict_type == BI_TYPE) {

  1293.         v->s.pict_type = B_TYPE;

  1294.         v->bi_type = 1;

  1295.     }

  1296.     return 0;

  1297. }

  1298. 

  1299. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1300. {

  1301.     int pqindex, lowquant;

  1302.     int status;

  1303. 

  1304.     v->p_frame_skipped = 0;

  1305. 

  1306.     if(v->interlace){

  1307.         v->fcm = decode012(gb);

  1308.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1309.     }

  1310.     switch(get_prefix(gb, 0, 4)) {

  1311.     case 0:

  1312.         v->s.pict_type = P_TYPE;

  1313.         break;

  1314.     case 1:

  1315.         v->s.pict_type = B_TYPE;

  1316.         break;

  1317.     case 2:

  1318.         v->s.pict_type = I_TYPE;

  1319.         break;

  1320.     case 3:

  1321.         v->s.pict_type = BI_TYPE;

  1322.         break;

  1323.     case 4:

  1324.         v->s.pict_type = P_TYPE; // skipped pic

  1325.         v->p_frame_skipped = 1;

  1326.         return 0;

  1327.     }

  1328.     if(v->tfcntrflag)

  1329.         get_bits(gb, 8);

  1330.     if(v->broadcast) {

  1331.         if(!v->interlace || v->psf) {

  1332.             v->rptfrm = get_bits(gb, 2);

  1333.         } else {

  1334.             v->tff = get_bits1(gb);

  1335.             v->rptfrm = get_bits1(gb);

  1336.         }

  1337.     }

  1338.     if(v->panscanflag) {

  1339.         //...

  1340.     }

  1341.     v->rnd = get_bits1(gb);

  1342.     if(v->interlace)

  1343.         v->uvsamp = get_bits1(gb);

  1344.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1345.     if(v->s.pict_type == B_TYPE) {

  1346.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1347.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1348.         if(v->bfraction == 0) {

  1349.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1350.         }

  1351.     }

  1352.     pqindex = get_bits(gb, 5);

  1353.     v->pqindex = pqindex;

  1354.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1355.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1356.     else

  1357.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1358. 

  1359.     v->pquantizer = 1;

  1360.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1361.         v->pquantizer = pqindex < 9;

  1362.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1363.         v->pquantizer = 0;

  1364.     v->pqindex = pqindex;

  1365.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1366.     else v->halfpq = 0;

  1367.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1368.         v->pquantizer = get_bits(gb, 1);

  1369. 

  1370.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1371. 

  1372.     switch(v->s.pict_type) {

  1373.     case I_TYPE:

  1374.     case BI_TYPE:

  1375.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1376.         if (status < 0) return -1;

  1377.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1378.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1379.         v->condover = CONDOVER_NONE;

  1380.         if(v->overlap && v->pq <= 8) {

  1381.             v->condover = decode012(gb);

  1382.             if(v->condover == CONDOVER_SELECT) {

  1383.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1384.                 if (status < 0) return -1;

  1385.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1386.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1387.             }

  1388.         }

  1389.         break;

  1390.     case P_TYPE:

  1391.         if(v->postprocflag)

  1392.             v->postproc = get_bits1(gb);

  1393.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1394.         else v->mvrange = 0;

  1395.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1396.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1397.         v->range_x = 1 << (v->k_x - 1);

  1398.         v->range_y = 1 << (v->k_y - 1);

  1399. 

  1400.         if (v->pq < 5) v->tt_index = 0;

  1401.         else if(v->pq < 13) v->tt_index = 1;

  1402.         else v->tt_index = 2;

  1403. 

  1404.         lowquant = (v->pq > 12) ? 0 : 1;

  1405.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1406.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1407.         {

  1408.             int scale, shift, i;

  1409.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1410.             v->lumscale = get_bits(gb, 6);

  1411.             v->lumshift = get_bits(gb, 6);

  1412.             /* fill lookup tables for intensity compensation */

  1413.             if(!v->lumscale) {

  1414.                 scale = -64;

  1415.                 shift = (255 - v->lumshift * 2) << 6;

  1416.                 if(v->lumshift > 31)

  1417.                     shift += 128 << 6;

  1418.             } else {

  1419.                 scale = v->lumscale + 32;

  1420.                 if(v->lumshift > 31)

  1421.                     shift = (v->lumshift - 64) << 6;

  1422.                 else

  1423.                     shift = v->lumshift << 6;

  1424.             }

  1425.             for(i = 0; i < 256; i++) {

  1426.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1427.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1428.             }

  1429.             v->use_ic = 1;

  1430.         }

  1431.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1432.             v->s.quarter_sample = 0;

  1433.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1434.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1435.                 v->s.quarter_sample = 0;

  1436.             else

  1437.                 v->s.quarter_sample = 1;

  1438.         } else

  1439.             v->s.quarter_sample = 1;

  1440.         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));

  1441. 

  1442.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1443.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1444.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1445.         {

  1446.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1447.             if (status < 0) return -1;

  1448.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1449.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1450.         } else {

  1451.             v->mv_type_is_raw = 0;

  1452.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1453.         }

  1454.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1455.         if (status < 0) return -1;

  1456.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1457.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1458. 

  1459.         /* Hopefully this is correct for P frames */

  1460.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1461.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1462.         if (v->dquant)

  1463.         {

  1464.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1465.             vop_dquant_decoding(v);

  1466.         }

  1467. 

  1468.         v->ttfrm = 0; //FIXME Is that so ?

  1469.         if (v->vstransform)

  1470.         {

  1471.             v->ttmbf = get_bits(gb, 1);

  1472.             if (v->ttmbf)

  1473.             {

  1474.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1475.             }

  1476.         } else {

  1477.             v->ttmbf = 1;

  1478.             v->ttfrm = TT_8X8;

  1479.         }

  1480.         break;

  1481.     case B_TYPE:

  1482.         if(v->postprocflag)

  1483.             v->postproc = get_bits1(gb);

  1484.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1485.         else v->mvrange = 0;

  1486.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1487.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1488.         v->range_x = 1 << (v->k_x - 1);

  1489.         v->range_y = 1 << (v->k_y - 1);

  1490. 

  1491.         if (v->pq < 5) v->tt_index = 0;

  1492.         else if(v->pq < 13) v->tt_index = 1;

  1493.         else v->tt_index = 2;

  1494. 

  1495.         lowquant = (v->pq > 12) ? 0 : 1;

  1496.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1497.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1498.         v->s.mspel = v->s.quarter_sample;

  1499. 

  1500.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1501.         if (status < 0) return -1;

  1502.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1503.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1504.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1505.         if (status < 0) return -1;

  1506.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1507.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1508. 

  1509.         v->s.mv_table_index = get_bits(gb, 2);

  1510.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1511. 

  1512.         if (v->dquant)

  1513.         {

  1514.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1515.             vop_dquant_decoding(v);

  1516.         }

  1517. 

  1518.         v->ttfrm = 0;

  1519.         if (v->vstransform)

  1520.         {

  1521.             v->ttmbf = get_bits(gb, 1);

  1522.             if (v->ttmbf)

  1523.             {

  1524.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1525.             }

  1526.         } else {

  1527.             v->ttmbf = 1;

  1528.             v->ttfrm = TT_8X8;

  1529.         }

  1530.         break;

  1531.     }

  1532. 

  1533.     /* AC Syntax */

  1534.     v->c_ac_table_index = decode012(gb);

  1535.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1536.     {

  1537.         v->y_ac_table_index = decode012(gb);

  1538.     }

  1539.     /* DC Syntax */

  1540.     v->s.dc_table_index = get_bits(gb, 1);

  1541.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1542.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1543.         vop_dquant_decoding(v);

  1544.     }

  1545. 

  1546.     v->bi_type = 0;

  1547.     if(v->s.pict_type == BI_TYPE) {

  1548.         v->s.pict_type = B_TYPE;

  1549.         v->bi_type = 1;

  1550.     }

  1551.     return 0;

  1552. }

  1553. 

  1554. /***********************************************************************/

  1555. /**

  1556.  * @defgroup block VC-1 Block-level functions

  1557.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1558.  * @{

  1559.  */

  1560. 

  1561. /**

  1562.  * @def GET_MQUANT

  1563.  * @brief Get macroblock-level quantizer scale

  1564.  */

  1565. #define GET_MQUANT()                                           \

  1566.   if (v->dquantfrm)                                            \

  1567.   {                                                            \

  1568.     int edges = 0;                                             \

  1569.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1570.     {                                                          \

  1571.       if (v->dqbilevel)                                        \

  1572.       {                                                        \

  1573.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1574.       }                                                        \

  1575.       else                                                     \

  1576.       {                                                        \

  1577.         mqdiff = get_bits(gb, 3);                              \

  1578.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1579.         else mquant = get_bits(gb, 5);                         \

  1580.       }                                                        \

  1581.     }                                                          \

  1582.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1583.         edges = 1 << v->dqsbedge;                              \

  1584.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1585.         edges = (3 << v->dqsbedge) % 15;                       \

  1586.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1587.         edges = 15;                                            \

  1588.     if((edges&1) && !s->mb_x)                                  \

  1589.         mquant = v->altpq;                                     \

  1590.     if((edges&2) && s->first_slice_line)                       \

  1591.         mquant = v->altpq;                                     \

  1592.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1593.         mquant = v->altpq;                                     \

  1594.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1595.         mquant = v->altpq;                                     \

  1596.   }

  1597. 

  1598. /**

  1599.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1600.  * @brief Get MV differentials

  1601.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1602.  * @param _dmv_x Horizontal differential for decoded MV

  1603.  * @param _dmv_y Vertical differential for decoded MV

  1604.  */

  1605. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1606.   index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table,\

  1607.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1608.   if (index > 36)                                                   \

  1609.   {                                                                 \

  1610.     mb_has_coeffs = 1;                                              \

  1611.     index -= 37;                                                    \

  1612.   }                                                                 \

  1613.   else mb_has_coeffs = 0;                                           \

  1614.   s->mb_intra = 0;                                                  \

  1615.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1616.   else if (index == 35)                                             \

  1617.   {                                                                 \

  1618.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1619.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1620.   }                                                                 \

  1621.   else if (index == 36)                                             \

  1622.   {                                                                 \

  1623.     _dmv_x = 0;                                                     \

  1624.     _dmv_y = 0;                                                     \

  1625.     s->mb_intra = 1;                                                \

  1626.   }                                                                 \

  1627.   else                                                              \

  1628.   {                                                                 \

  1629.     index1 = index%6;                                               \

  1630.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1631.     else                                   val = 0;                 \

  1632.     if(size_table[index1] - val > 0)                                \

  1633.         val = get_bits(gb, size_table[index1] - val);               \

  1634.     else                                   val = 0;                 \

  1635.     sign = 0 - (val&1);                                             \

  1636.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1637.                                                                     \

  1638.     index1 = index/6;                                               \

  1639.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1640.     else                                   val = 0;                 \

  1641.     if(size_table[index1] - val > 0)                                \

  1642.         val = get_bits(gb, size_table[index1] - val);               \

  1643.     else                                   val = 0;                 \

  1644.     sign = 0 - (val&1);                                             \

  1645.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1646.   }

  1647. 

  1648. /** Predict and set motion vector

  1649.  */

  1650. static inline void vc1_pred_mv(MpegEncContext *s, int n, int dmv_x, int dmv_y, int mv1, int r_x, int r_y, uint8_t* is_intra)

  1651. {

  1652.     int xy, wrap, off = 0;

  1653.     int16_t *A, *B, *C;

  1654.     int px, py;

  1655.     int sum;

  1656. 

  1657.     /* scale MV difference to be quad-pel */

  1658.     dmv_x <<= 1 - s->quarter_sample;

  1659.     dmv_y <<= 1 - s->quarter_sample;

  1660. 

  1661.     wrap = s->b8_stride;

  1662.     xy = s->block_index[n];

  1663. 

  1664.     if(s->mb_intra){

  1665.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1666.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1667.         s->current_picture.motion_val[1][xy][0] = 0;

  1668.         s->current_picture.motion_val[1][xy][1] = 0;

  1669.         if(mv1) { /* duplicate motion data for 1-MV block */

  1670.             s->current_picture.motion_val[0][xy + 1][0] = 0;

  1671.             s->current_picture.motion_val[0][xy + 1][1] = 0;

  1672.             s->current_picture.motion_val[0][xy + wrap][0] = 0;

  1673.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  1674.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1675.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1676.             s->current_picture.motion_val[1][xy + 1][0] = 0;

  1677.             s->current_picture.motion_val[1][xy + 1][1] = 0;

  1678.             s->current_picture.motion_val[1][xy + wrap][0] = 0;

  1679.             s->current_picture.motion_val[1][xy + wrap][1] = 0;

  1680.             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;

  1681.             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

  1682.         }

  1683.         return;

  1684.     }

  1685. 

  1686.     C = s->current_picture.motion_val[0][xy - 1];

  1687.     A = s->current_picture.motion_val[0][xy - wrap];

  1688.     if(mv1)

  1689.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1690.     else {

  1691.         //in 4-MV mode different blocks have different B predictor position

  1692.         switch(n){

  1693.         case 0:

  1694.             off = (s->mb_x > 0) ? -1 : 1;

  1695.             break;

  1696.         case 1:

  1697.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1698.             break;

  1699.         case 2:

  1700.             off = 1;

  1701.             break;

  1702.         case 3:

  1703.             off = -1;

  1704.         }

  1705.     }

  1706.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1707. 

  1708.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

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

  1710.             px = A[0];

  1711.             py = A[1];

  1712.         } else {

  1713.             px = mid_pred(A[0], B[0], C[0]);

  1714.             py = mid_pred(A[1], B[1], C[1]);

  1715.         }

  1716.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1717.         px = C[0];

  1718.         py = C[1];

  1719.     } else {

  1720.         px = py = 0;

  1721.     }

  1722.     /* Pullback MV as specified in 8.3.5.3.4 */

  1723.     {

  1724.         int qx, qy, X, Y;

  1725.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1726.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1727.         X = (s->mb_width << 6) - 4;

  1728.         Y = (s->mb_height << 6) - 4;

  1729.         if(mv1) {

  1730.             if(qx + px < -60) px = -60 - qx;

  1731.             if(qy + py < -60) py = -60 - qy;

  1732.         } else {

  1733.             if(qx + px < -28) px = -28 - qx;

  1734.             if(qy + py < -28) py = -28 - qy;

  1735.         }

  1736.         if(qx + px > X) px = X - qx;

  1737.         if(qy + py > Y) py = Y - qy;

  1738.     }

  1739.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1740.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1741.         if(is_intra[xy - wrap])

  1742.             sum = FFABS(px) + FFABS(py);

  1743.         else

  1744.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1745.         if(sum > 32) {

  1746.             if(get_bits1(&s->gb)) {

  1747.                 px = A[0];

  1748.                 py = A[1];

  1749.             } else {

  1750.                 px = C[0];

  1751.                 py = C[1];

  1752.             }

  1753.         } else {

  1754.             if(is_intra[xy - 1])

  1755.                 sum = FFABS(px) + FFABS(py);

  1756.             else

  1757.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1758.             if(sum > 32) {

  1759.                 if(get_bits1(&s->gb)) {

  1760.                     px = A[0];

  1761.                     py = A[1];

  1762.                 } else {

  1763.                     px = C[0];

  1764.                     py = C[1];

  1765.                 }

  1766.             }

  1767.         }

  1768.     }

  1769.     /* store MV using signed modulus of MV range defined in 4.11 */

  1770.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1771.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1772.     if(mv1) { /* duplicate motion data for 1-MV block */

  1773.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1774.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  1775.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1776.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1777.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1778.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1779.     }

  1780. }

  1781. 

  1782. /** Motion compensation for direct or interpolated blocks in B-frames

  1783.  */

  1784. static void vc1_interp_mc(VC1Context *v)

  1785. {

  1786.     MpegEncContext *s = &v->s;

  1787.     DSPContext *dsp = &v->s.dsp;

  1788.     uint8_t *srcY, *srcU, *srcV;

  1789.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1790. 

  1791.     if(!v->s.next_picture.data[0])return;

  1792. 

  1793.     mx = s->mv[1][0][0];

  1794.     my = s->mv[1][0][1];

  1795.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1796.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1797.     if(v->fastuvmc) {

  1798.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  1799.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  1800.     }

  1801.     srcY = s->next_picture.data[0];

  1802.     srcU = s->next_picture.data[1];

  1803.     srcV = s->next_picture.data[2];

  1804. 

  1805.     src_x = s->mb_x * 16 + (mx >> 2);

  1806.     src_y = s->mb_y * 16 + (my >> 2);

  1807.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1808.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1809. 

  1810.     if(v->profile != PROFILE_ADVANCED){

  1811.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1812.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1813.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1814.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1815.     }else{

  1816.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1817.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1818.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1819.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1820.     }

  1821. 

  1822.     srcY += src_y * s->linesize + src_x;

  1823.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1824.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1825. 

  1826.     /* for grayscale we should not try to read from unknown area */

  1827.     if(s->flags & CODEC_FLAG_GRAY) {

  1828.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1829.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1830.     }

  1831. 

  1832.     if(v->rangeredfrm

  1833.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1834.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1835.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1836. 

  1837.         srcY -= s->mspel * (1 + s->linesize);

  1838.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  1839.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1840.         srcY = s->edge_emu_buffer;

  1841.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1842.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1843.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1844.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1845.         srcU = uvbuf;

  1846.         srcV = uvbuf + 16;

  1847.         /* if we deal with range reduction we need to scale source blocks */

  1848.         if(v->rangeredfrm) {

  1849.             int i, j;

  1850.             uint8_t *src, *src2;

  1851. 

  1852.             src = srcY;

  1853.             for(j = 0; j < 17 + s->mspel*2; j++) {

  1854.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1855.                 src += s->linesize;

  1856.             }

  1857.             src = srcU; src2 = srcV;

  1858.             for(j = 0; j < 9; j++) {

  1859.                 for(i = 0; i < 9; i++) {

  1860.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1861.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1862.                 }

  1863.                 src += s->uvlinesize;

  1864.                 src2 += s->uvlinesize;

  1865.             }

  1866.         }

  1867.         srcY += s->mspel * (1 + s->linesize);

  1868.     }

  1869. 

  1870.     mx >>= 1;

  1871.     my >>= 1;

  1872.     dxy = ((my & 1) << 1) | (mx & 1);

  1873. 

  1874.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1875. 

  1876.     if(s->flags & CODEC_FLAG_GRAY) return;

  1877.     /* Chroma MC always uses qpel blilinear */

  1878.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1879.     uvmx = (uvmx&3)<<1;

  1880.     uvmy = (uvmy&3)<<1;

  1881.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1882.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1883. }

  1884. 

  1885. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1886. {

  1887.     int n = bfrac;

  1888. 

  1889. #if B_FRACTION_DEN==256

  1890.     if(inv)

  1891.         n -= 256;

  1892.     if(!qs)

  1893.         return 2 * ((value * n + 255) >> 9);

  1894.     return (value * n + 128) >> 8;

  1895. #else

  1896.     if(inv)

  1897.         n -= B_FRACTION_DEN;

  1898.     if(!qs)

  1899.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1900.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1901. #endif

  1902. }

  1903. 

  1904. /** Reconstruct motion vector for B-frame and do motion compensation

  1905.  */

  1906. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1907. {

  1908.     if(v->use_ic) {

  1909.         v->mv_mode2 = v->mv_mode;

  1910.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  1911.     }

  1912.     if(direct) {

  1913.         vc1_mc_1mv(v, 0);

  1914.         vc1_interp_mc(v);

  1915.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1916.         return;

  1917.     }

  1918.     if(mode == BMV_TYPE_INTERPOLATED) {

  1919.         vc1_mc_1mv(v, 0);

  1920.         vc1_interp_mc(v);

  1921.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1922.         return;

  1923.     }

  1924. 

  1925.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  1926.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  1927.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  1928. }

  1929. 

  1930. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  1931. {

  1932.     MpegEncContext *s = &v->s;

  1933.     int xy, wrap, off = 0;

  1934.     int16_t *A, *B, *C;

  1935.     int px, py;

  1936.     int sum;

  1937.     int r_x, r_y;

  1938.     const uint8_t *is_intra = v->mb_type[0];

  1939. 

  1940.     r_x = v->range_x;

  1941.     r_y = v->range_y;

  1942.     /* scale MV difference to be quad-pel */

  1943.     dmv_x[0] <<= 1 - s->quarter_sample;

  1944.     dmv_y[0] <<= 1 - s->quarter_sample;

  1945.     dmv_x[1] <<= 1 - s->quarter_sample;

  1946.     dmv_y[1] <<= 1 - s->quarter_sample;

  1947. 

  1948.     wrap = s->b8_stride;

  1949.     xy = s->block_index[0];

  1950. 

  1951.     if(s->mb_intra) {

  1952.         s->current_picture.motion_val[0][xy][0] =

  1953.         s->current_picture.motion_val[0][xy][1] =

  1954.         s->current_picture.motion_val[1][xy][0] =

  1955.         s->current_picture.motion_val[1][xy][1] = 0;

  1956.         return;

  1957.     }

  1958.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  1959.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  1960.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  1961.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  1962. 

  1963.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  1964.     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));

  1965.     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));

  1966.     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));

  1967.     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));

  1968.     if(direct) {

  1969.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  1970.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  1971.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  1972.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  1973.         return;

  1974.     }

  1975. 

  1976.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  1977.         C = s->current_picture.motion_val[0][xy - 2];

  1978.         A = s->current_picture.motion_val[0][xy - wrap*2];

  1979.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1980.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  1981. 

  1982.         if(!s->mb_x) C[0] = C[1] = 0;

  1983.         if(!s->first_slice_line) { // predictor A is not out of bounds

  1984.             if(s->mb_width == 1) {

  1985.                 px = A[0];

  1986.                 py = A[1];

  1987.             } else {

  1988.                 px = mid_pred(A[0], B[0], C[0]);

  1989.                 py = mid_pred(A[1], B[1], C[1]);

  1990.             }

  1991.         } else if(s->mb_x) { // predictor C is not out of bounds

  1992.             px = C[0];

  1993.             py = C[1];

  1994.         } else {

  1995.             px = py = 0;

  1996.         }

  1997.         /* Pullback MV as specified in 8.3.5.3.4 */

  1998.         {

  1999.             int qx, qy, X, Y;

  2000.             if(v->profile < PROFILE_ADVANCED) {

  2001.                 qx = (s->mb_x << 5);

  2002.                 qy = (s->mb_y << 5);

  2003.                 X = (s->mb_width << 5) - 4;

  2004.                 Y = (s->mb_height << 5) - 4;

  2005.                 if(qx + px < -28) px = -28 - qx;

  2006.                 if(qy + py < -28) py = -28 - qy;

  2007.                 if(qx + px > X) px = X - qx;

  2008.                 if(qy + py > Y) py = Y - qy;

  2009.             } else {

  2010.                 qx = (s->mb_x << 6);

  2011.                 qy = (s->mb_y << 6);

  2012.                 X = (s->mb_width << 6) - 4;

  2013.                 Y = (s->mb_height << 6) - 4;

  2014.                 if(qx + px < -60) px = -60 - qx;

  2015.                 if(qy + py < -60) py = -60 - qy;

  2016.                 if(qx + px > X) px = X - qx;

  2017.                 if(qy + py > Y) py = Y - qy;

  2018.             }

  2019.         }

  2020.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2021.         if(0 && !s->first_slice_line && s->mb_x) {

  2022.             if(is_intra[xy - wrap])

  2023.                 sum = FFABS(px) + FFABS(py);

  2024.             else

  2025.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2026.             if(sum > 32) {

  2027.                 if(get_bits1(&s->gb)) {

  2028.                     px = A[0];

  2029.                     py = A[1];

  2030.                 } else {

  2031.                     px = C[0];

  2032.                     py = C[1];

  2033.                 }

  2034.             } else {

  2035.                 if(is_intra[xy - 2])

  2036.                     sum = FFABS(px) + FFABS(py);

  2037.                 else

  2038.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2039.                 if(sum > 32) {

  2040.                     if(get_bits1(&s->gb)) {

  2041.                         px = A[0];

  2042.                         py = A[1];

  2043.                     } else {

  2044.                         px = C[0];

  2045.                         py = C[1];

  2046.                     }

  2047.                 }

  2048.             }

  2049.         }

  2050.         /* store MV using signed modulus of MV range defined in 4.11 */

  2051.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2052.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2053.     }

  2054.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2055.         C = s->current_picture.motion_val[1][xy - 2];

  2056.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2057.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2058.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2059. 

  2060.         if(!s->mb_x) C[0] = C[1] = 0;

  2061.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2062.             if(s->mb_width == 1) {

  2063.                 px = A[0];

  2064.                 py = A[1];

  2065.             } else {

  2066.                 px = mid_pred(A[0], B[0], C[0]);

  2067.                 py = mid_pred(A[1], B[1], C[1]);

  2068.             }

  2069.         } else if(s->mb_x) { // predictor C is not out of bounds

  2070.             px = C[0];

  2071.             py = C[1];

  2072.         } else {

  2073.             px = py = 0;

  2074.         }

  2075.         /* Pullback MV as specified in 8.3.5.3.4 */

  2076.         {

  2077.             int qx, qy, X, Y;

  2078.             if(v->profile < PROFILE_ADVANCED) {

  2079.                 qx = (s->mb_x << 5);

  2080.                 qy = (s->mb_y << 5);

  2081.                 X = (s->mb_width << 5) - 4;

  2082.                 Y = (s->mb_height << 5) - 4;

  2083.                 if(qx + px < -28) px = -28 - qx;

  2084.                 if(qy + py < -28) py = -28 - qy;

  2085.                 if(qx + px > X) px = X - qx;

  2086.                 if(qy + py > Y) py = Y - qy;

  2087.             } else {

  2088.                 qx = (s->mb_x << 6);

  2089.                 qy = (s->mb_y << 6);

  2090.                 X = (s->mb_width << 6) - 4;

  2091.                 Y = (s->mb_height << 6) - 4;

  2092.                 if(qx + px < -60) px = -60 - qx;

  2093.                 if(qy + py < -60) py = -60 - qy;

  2094.                 if(qx + px > X) px = X - qx;

  2095.                 if(qy + py > Y) py = Y - qy;

  2096.             }

  2097.         }

  2098.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2099.         if(0 && !s->first_slice_line && s->mb_x) {

  2100.             if(is_intra[xy - wrap])

  2101.                 sum = FFABS(px) + FFABS(py);

  2102.             else

  2103.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2104.             if(sum > 32) {

  2105.                 if(get_bits1(&s->gb)) {

  2106.                     px = A[0];

  2107.                     py = A[1];

  2108.                 } else {

  2109.                     px = C[0];

  2110.                     py = C[1];

  2111.                 }

  2112.             } else {

  2113.                 if(is_intra[xy - 2])

  2114.                     sum = FFABS(px) + FFABS(py);

  2115.                 else

  2116.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2117.                 if(sum > 32) {

  2118.                     if(get_bits1(&s->gb)) {

  2119.                         px = A[0];

  2120.                         py = A[1];

  2121.                     } else {

  2122.                         px = C[0];

  2123.                         py = C[1];

  2124.                     }

  2125.                 }

  2126.             }

  2127.         }

  2128.         /* store MV using signed modulus of MV range defined in 4.11 */

  2129. 

  2130.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2131.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2132.     }

  2133.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2134.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2135.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2136.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2137. }

  2138. 

  2139. /** Get predicted DC value for I-frames only

  2140.  * prediction dir: left=0, top=1

  2141.  * @param s MpegEncContext

  2142.  * @param[in] n block index in the current MB

  2143.  * @param dc_val_ptr Pointer to DC predictor

  2144.  * @param dir_ptr Prediction direction for use in AC prediction

  2145.  */

  2146. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2147.                               int16_t **dc_val_ptr, int *dir_ptr)

  2148. {

  2149.     int a, b, c, wrap, pred, scale;

  2150.     int16_t *dc_val;

  2151.     static const uint16_t dcpred[32] = {

  2152.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2153.          114,  102,   93,   85,   79,   73,   68,   64,

  2154.           60,   57,   54,   51,   49,   47,   45,   43,

  2155.           41,   39,   38,   37,   35,   34,   33

  2156.     };

  2157. 

  2158.     /* find prediction - wmv3_dc_scale always used here in fact */

  2159.     if (n < 4)     scale = s->y_dc_scale;

  2160.     else           scale = s->c_dc_scale;

  2161. 

  2162.     wrap = s->block_wrap[n];

  2163.     dc_val= s->dc_val[0] + s->block_index[n];

  2164. 

  2165.     /* B A

  2166.      * C X

  2167.      */

  2168.     c = dc_val[ - 1];

  2169.     b = dc_val[ - 1 - wrap];

  2170.     a = dc_val[ - wrap];

  2171. 

  2172.     if (pq < 9 || !overlap)

  2173.     {

  2174.         /* Set outer values */

  2175.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2176.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2177.     }

  2178.     else

  2179.     {

  2180.         /* Set outer values */

  2181.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2182.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2183.     }

  2184. 

  2185.     if (abs(a - b) <= abs(b - c)) {

  2186.         pred = c;

  2187.         *dir_ptr = 1;//left

  2188.     } else {

  2189.         pred = a;

  2190.         *dir_ptr = 0;//top

  2191.     }

  2192. 

  2193.     /* update predictor */

  2194.     *dc_val_ptr = &dc_val[0];

  2195.     return pred;

  2196. }

  2197. 

  2198. 

  2199. /** Get predicted DC value

  2200.  * prediction dir: left=0, top=1

  2201.  * @param s MpegEncContext

  2202.  * @param[in] n block index in the current MB

  2203.  * @param dc_val_ptr Pointer to DC predictor

  2204.  * @param dir_ptr Prediction direction for use in AC prediction

  2205.  */

  2206. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2207.                               int a_avail, int c_avail,

  2208.                               int16_t **dc_val_ptr, int *dir_ptr)

  2209. {

  2210.     int a, b, c, wrap, pred, scale;

  2211.     int16_t *dc_val;

  2212.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2213.     int q1, q2 = 0;

  2214. 

  2215.     /* find prediction - wmv3_dc_scale always used here in fact */

  2216.     if (n < 4)     scale = s->y_dc_scale;

  2217.     else           scale = s->c_dc_scale;

  2218. 

  2219.     wrap = s->block_wrap[n];

  2220.     dc_val= s->dc_val[0] + s->block_index[n];

  2221. 

  2222.     /* B A

  2223.      * C X

  2224.      */

  2225.     c = dc_val[ - 1];

  2226.     b = dc_val[ - 1 - wrap];

  2227.     a = dc_val[ - wrap];

  2228.     /* scale predictors if needed */

  2229.     q1 = s->current_picture.qscale_table[mb_pos];

  2230.     if(c_avail && (n!= 1 && n!=3)) {

  2231.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2232.         if(q2 && q2 != q1)

  2233.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2234.     }

  2235.     if(a_avail && (n!= 2 && n!=3)) {

  2236.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2237.         if(q2 && q2 != q1)

  2238.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2239.     }

  2240.     if(a_avail && c_avail && (n!=3)) {

  2241.         int off = mb_pos;

  2242.         if(n != 1) off--;

  2243.         if(n != 2) off -= s->mb_stride;

  2244.         q2 = s->current_picture.qscale_table[off];

  2245.         if(q2 && q2 != q1)

  2246.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2247.     }

  2248. 

  2249.     if(a_avail && c_avail) {

  2250.         if(abs(a - b) <= abs(b - c)) {

  2251.             pred = c;

  2252.             *dir_ptr = 1;//left

  2253.         } else {

  2254.             pred = a;

  2255.             *dir_ptr = 0;//top

  2256.         }

  2257.     } else if(a_avail) {

  2258.         pred = a;

  2259.         *dir_ptr = 0;//top

  2260.     } else if(c_avail) {

  2261.         pred = c;

  2262.         *dir_ptr = 1;//left

  2263.     } else {

  2264.         pred = 0;

  2265.         *dir_ptr = 1;//left

  2266.     }

  2267. 

  2268.     /* update predictor */

  2269.     *dc_val_ptr = &dc_val[0];

  2270.     return pred;

  2271. }

  2272. 

  2273. 

  2274. /**

  2275.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2276.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2277.  * @{

  2278.  */

  2279. 

  2280. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2281. {

  2282.     int xy, wrap, pred, a, b, c;

  2283. 

  2284.     xy = s->block_index[n];

  2285.     wrap = s->b8_stride;

  2286. 

  2287.     /* B C

  2288.      * A X

  2289.      */

  2290.     a = s->coded_block[xy - 1       ];

  2291.     b = s->coded_block[xy - 1 - wrap];

  2292.     c = s->coded_block[xy     - wrap];

  2293. 

  2294.     if (b == c) {

  2295.         pred = a;

  2296.     } else {

  2297.         pred = c;

  2298.     }

  2299. 

  2300.     /* store value */

  2301.     *coded_block_ptr = &s->coded_block[xy];

  2302. 

  2303.     return pred;

  2304. }

  2305. 

  2306. /**

  2307.  * Decode one AC coefficient

  2308.  * @param v The VC1 context

  2309.  * @param last Last coefficient

  2310.  * @param skip How much zero coefficients to skip

  2311.  * @param value Decoded AC coefficient value

  2312.  * @see 8.1.3.4

  2313.  */

  2314. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2315. {

  2316.     GetBitContext *gb = &v->s.gb;

  2317.     int index, escape, run = 0, level = 0, lst = 0;

  2318. 

  2319.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2320.     if (index != vc1_ac_sizes[codingset] - 1) {

  2321.         run = vc1_index_decode_table[codingset][index][0];

  2322.         level = vc1_index_decode_table[codingset][index][1];

  2323.         lst = index >= vc1_last_decode_table[codingset];

  2324.         if(get_bits(gb, 1))

  2325.             level = -level;

  2326.     } else {

  2327.         escape = decode210(gb);

  2328.         if (escape != 2) {

  2329.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2330.             run = vc1_index_decode_table[codingset][index][0];

  2331.             level = vc1_index_decode_table[codingset][index][1];

  2332.             lst = index >= vc1_last_decode_table[codingset];

  2333.             if(escape == 0) {

  2334.                 if(lst)

  2335.                     level += vc1_last_delta_level_table[codingset][run];

  2336.                 else

  2337.                     level += vc1_delta_level_table[codingset][run];

  2338.             } else {

  2339.                 if(lst)

  2340.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2341.                 else

  2342.                     run += vc1_delta_run_table[codingset][level] + 1;

  2343.             }

  2344.             if(get_bits(gb, 1))

  2345.                 level = -level;

  2346.         } else {

  2347.             int sign;

  2348.             lst = get_bits(gb, 1);

  2349.             if(v->s.esc3_level_length == 0) {

  2350.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2351.                     v->s.esc3_level_length = get_bits(gb, 3);

  2352.                     if(!v->s.esc3_level_length)

  2353.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2354.                 } else { //table 60

  2355.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2356.                 }

  2357.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2358.             }

  2359.             run = get_bits(gb, v->s.esc3_run_length);

  2360.             sign = get_bits(gb, 1);

  2361.             level = get_bits(gb, v->s.esc3_level_length);

  2362.             if(sign)

  2363.                 level = -level;

  2364.         }

  2365.     }

  2366. 

  2367.     *last = lst;

  2368.     *skip = run;

  2369.     *value = level;

  2370. }

  2371. 

  2372. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2373.  * @param v VC1Context

  2374.  * @param block block to decode

  2375.  * @param coded are AC coeffs present or not

  2376.  * @param codingset set of VLC to decode data

  2377.  */

  2378. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2379. {

  2380.     GetBitContext *gb = &v->s.gb;

  2381.     MpegEncContext *s = &v->s;

  2382.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2383.     int run_diff, i;

  2384.     int16_t *dc_val;

  2385.     int16_t *ac_val, *ac_val2;

  2386.     int dcdiff;

  2387. 

  2388.     /* Get DC differential */

  2389.     if (n < 4) {

  2390.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2391.     } else {

  2392.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2393.     }

  2394.     if (dcdiff < 0){

  2395.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2396.         return -1;

  2397.     }

  2398.     if (dcdiff)

  2399.     {

  2400.         if (dcdiff == 119 /* ESC index value */)

  2401.         {

  2402.             /* TODO: Optimize */

  2403.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2404.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2405.             else dcdiff = get_bits(gb, 8);

  2406.         }

  2407.         else

  2408.         {

  2409.             if (v->pq == 1)

  2410.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2411.             else if (v->pq == 2)

  2412.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2413.         }

  2414.         if (get_bits(gb, 1))

  2415.             dcdiff = -dcdiff;

  2416.     }

  2417. 

  2418.     /* Prediction */

  2419.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2420.     *dc_val = dcdiff;

  2421. 

  2422.     /* Store the quantized DC coeff, used for prediction */

  2423.     if (n < 4) {

  2424.         block[0] = dcdiff * s->y_dc_scale;

  2425.     } else {

  2426.         block[0] = dcdiff * s->c_dc_scale;

  2427.     }

  2428.     /* Skip ? */

  2429.     run_diff = 0;

  2430.     i = 0;

  2431.     if (!coded) {

  2432.         goto not_coded;

  2433.     }

  2434. 

  2435.     //AC Decoding

  2436.     i = 1;

  2437. 

  2438.     {

  2439.         int last = 0, skip, value;

  2440.         const int8_t *zz_table;

  2441.         int scale;

  2442.         int k;

  2443. 

  2444.         scale = v->pq * 2 + v->halfpq;

  2445. 

  2446.         if(v->s.ac_pred) {

  2447.             if(!dc_pred_dir)

  2448.                 zz_table = ff_vc1_horizontal_zz;

  2449.             else

  2450.                 zz_table = ff_vc1_vertical_zz;

  2451.         } else

  2452.             zz_table = ff_vc1_normal_zz;

  2453. 

  2454.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2455.         ac_val2 = ac_val;

  2456.         if(dc_pred_dir) //left

  2457.             ac_val -= 16;

  2458.         else //top

  2459.             ac_val -= 16 * s->block_wrap[n];

  2460. 

  2461.         while (!last) {

  2462.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2463.             i += skip;

  2464.             if(i > 63)

  2465.                 break;

  2466.             block[zz_table[i++]] = value;

  2467.         }

  2468. 

  2469.         /* apply AC prediction if needed */

  2470.         if(s->ac_pred) {

  2471.             if(dc_pred_dir) { //left

  2472.                 for(k = 1; k < 8; k++)

  2473.                     block[k << 3] += ac_val[k];

  2474.             } else { //top

  2475.                 for(k = 1; k < 8; k++)

  2476.                     block[k] += ac_val[k + 8];

  2477.             }

  2478.         }

  2479.         /* save AC coeffs for further prediction */

  2480.         for(k = 1; k < 8; k++) {

  2481.             ac_val2[k] = block[k << 3];

  2482.             ac_val2[k + 8] = block[k];

  2483.         }

  2484. 

  2485.         /* scale AC coeffs */

  2486.         for(k = 1; k < 64; k++)

  2487.             if(block[k]) {

  2488.                 block[k] *= scale;

  2489.                 if(!v->pquantizer)

  2490.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2491.             }

  2492. 

  2493.         if(s->ac_pred) i = 63;

  2494.     }

  2495. 

  2496. not_coded:

  2497.     if(!coded) {

  2498.         int k, scale;

  2499.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2500.         ac_val2 = ac_val;

  2501. 

  2502.         scale = v->pq * 2 + v->halfpq;

  2503.         memset(ac_val2, 0, 16 * 2);

  2504.         if(dc_pred_dir) {//left

  2505.             ac_val -= 16;

  2506.             if(s->ac_pred)

  2507.                 memcpy(ac_val2, ac_val, 8 * 2);

  2508.         } else {//top

  2509.             ac_val -= 16 * s->block_wrap[n];

  2510.             if(s->ac_pred)

  2511.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2512.         }

  2513. 

  2514.         /* apply AC prediction if needed */

  2515.         if(s->ac_pred) {

  2516.             if(dc_pred_dir) { //left

  2517.                 for(k = 1; k < 8; k++) {

  2518.                     block[k << 3] = ac_val[k] * scale;

  2519.                     if(!v->pquantizer && block[k << 3])

  2520.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2521.                 }

  2522.             } else { //top

  2523.                 for(k = 1; k < 8; k++) {

  2524.                     block[k] = ac_val[k + 8] * scale;

  2525.                     if(!v->pquantizer && block[k])

  2526.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2527.                 }

  2528.             }

  2529.             i = 63;

  2530.         }

  2531.     }

  2532.     s->block_last_index[n] = i;

  2533. 

  2534.     return 0;

  2535. }

  2536. 

  2537. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2538.  * @param v VC1Context

  2539.  * @param block block to decode

  2540.  * @param coded are AC coeffs present or not

  2541.  * @param codingset set of VLC to decode data

  2542.  */

  2543. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2544. {

  2545.     GetBitContext *gb = &v->s.gb;

  2546.     MpegEncContext *s = &v->s;

  2547.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2548.     int run_diff, i;

  2549.     int16_t *dc_val;

  2550.     int16_t *ac_val, *ac_val2;

  2551.     int dcdiff;

  2552.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2553.     int use_pred = s->ac_pred;

  2554.     int scale;

  2555.     int q1, q2 = 0;

  2556.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2557. 

  2558.     /* Get DC differential */

  2559.     if (n < 4) {

  2560.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2561.     } else {

  2562.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2563.     }

  2564.     if (dcdiff < 0){

  2565.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2566.         return -1;

  2567.     }

  2568.     if (dcdiff)

  2569.     {

  2570.         if (dcdiff == 119 /* ESC index value */)

  2571.         {

  2572.             /* TODO: Optimize */

  2573.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2574.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2575.             else dcdiff = get_bits(gb, 8);

  2576.         }

  2577.         else

  2578.         {

  2579.             if (mquant == 1)

  2580.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2581.             else if (mquant == 2)

  2582.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2583.         }

  2584.         if (get_bits(gb, 1))

  2585.             dcdiff = -dcdiff;

  2586.     }

  2587. 

  2588.     /* Prediction */

  2589.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2590.     *dc_val = dcdiff;

  2591. 

  2592.     /* Store the quantized DC coeff, used for prediction */

  2593.     if (n < 4) {

  2594.         block[0] = dcdiff * s->y_dc_scale;

  2595.     } else {

  2596.         block[0] = dcdiff * s->c_dc_scale;

  2597.     }

  2598.     /* Skip ? */

  2599.     run_diff = 0;

  2600.     i = 0;

  2601. 

  2602.     //AC Decoding

  2603.     i = 1;

  2604. 

  2605.     /* check if AC is needed at all */

  2606.     if(!a_avail && !c_avail) use_pred = 0;

  2607.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2608.     ac_val2 = ac_val;

  2609. 

  2610.     scale = mquant * 2 + v->halfpq;

  2611. 

  2612.     if(dc_pred_dir) //left

  2613.         ac_val -= 16;

  2614.     else //top

  2615.         ac_val -= 16 * s->block_wrap[n];

  2616. 

  2617.     q1 = s->current_picture.qscale_table[mb_pos];

  2618.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2619.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2620.     if(dc_pred_dir && n==1) q2 = q1;

  2621.     if(!dc_pred_dir && n==2) q2 = q1;

  2622.     if(n==3) q2 = q1;

  2623. 

  2624.     if(coded) {

  2625.         int last = 0, skip, value;

  2626.         const int8_t *zz_table;

  2627.         int k;

  2628. 

  2629.         if(v->s.ac_pred) {

  2630.             if(!dc_pred_dir)

  2631.                 zz_table = ff_vc1_horizontal_zz;

  2632.             else

  2633.                 zz_table = ff_vc1_vertical_zz;

  2634.         } else

  2635.             zz_table = ff_vc1_normal_zz;

  2636. 

  2637.         while (!last) {

  2638.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2639.             i += skip;

  2640.             if(i > 63)

  2641.                 break;

  2642.             block[zz_table[i++]] = value;

  2643.         }

  2644. 

  2645.         /* apply AC prediction if needed */

  2646.         if(use_pred) {

  2647.             /* scale predictors if needed*/

  2648.             if(q2 && q1!=q2) {

  2649.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2650.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2651. 

  2652.                 if(dc_pred_dir) { //left

  2653.                     for(k = 1; k < 8; k++)

  2654.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2655.                 } else { //top

  2656.                     for(k = 1; k < 8; k++)

  2657.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2658.                 }

  2659.             } else {

  2660.                 if(dc_pred_dir) { //left

  2661.                     for(k = 1; k < 8; k++)

  2662.                         block[k << 3] += ac_val[k];

  2663.                 } else { //top

  2664.                     for(k = 1; k < 8; k++)

  2665.                         block[k] += ac_val[k + 8];

  2666.                 }

  2667.             }

  2668.         }

  2669.         /* save AC coeffs for further prediction */

  2670.         for(k = 1; k < 8; k++) {

  2671.             ac_val2[k] = block[k << 3];

  2672.             ac_val2[k + 8] = block[k];

  2673.         }

  2674. 

  2675.         /* scale AC coeffs */

  2676.         for(k = 1; k < 64; k++)

  2677.             if(block[k]) {

  2678.                 block[k] *= scale;

  2679.                 if(!v->pquantizer)

  2680.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2681.             }

  2682. 

  2683.         if(use_pred) i = 63;

  2684.     } else { // no AC coeffs

  2685.         int k;

  2686. 

  2687.         memset(ac_val2, 0, 16 * 2);

  2688.         if(dc_pred_dir) {//left

  2689.             if(use_pred) {

  2690.                 memcpy(ac_val2, ac_val, 8 * 2);

  2691.                 if(q2 && q1!=q2) {

  2692.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2693.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2694.                     for(k = 1; k < 8; k++)

  2695.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2696.                 }

  2697.             }

  2698.         } else {//top

  2699.             if(use_pred) {

  2700.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2701.                 if(q2 && q1!=q2) {

  2702.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2703.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2704.                     for(k = 1; k < 8; k++)

  2705.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2706.                 }

  2707.             }

  2708.         }

  2709. 

  2710.         /* apply AC prediction if needed */

  2711.         if(use_pred) {

  2712.             if(dc_pred_dir) { //left

  2713.                 for(k = 1; k < 8; k++) {

  2714.                     block[k << 3] = ac_val2[k] * scale;

  2715.                     if(!v->pquantizer && block[k << 3])

  2716.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2717.                 }

  2718.             } else { //top

  2719.                 for(k = 1; k < 8; k++) {

  2720.                     block[k] = ac_val2[k + 8] * scale;

  2721.                     if(!v->pquantizer && block[k])

  2722.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2723.                 }

  2724.             }

  2725.             i = 63;

  2726.         }

  2727.     }

  2728.     s->block_last_index[n] = i;

  2729. 

  2730.     return 0;

  2731. }

  2732. 

  2733. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2734.  * @param v VC1Context

  2735.  * @param block block to decode

  2736.  * @param coded are AC coeffs present or not

  2737.  * @param mquant block quantizer

  2738.  * @param codingset set of VLC to decode data

  2739.  */

  2740. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2741. {

  2742.     GetBitContext *gb = &v->s.gb;

  2743.     MpegEncContext *s = &v->s;

  2744.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2745.     int run_diff, i;

  2746.     int16_t *dc_val;

  2747.     int16_t *ac_val, *ac_val2;

  2748.     int dcdiff;

  2749.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2750.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2751.     int use_pred = s->ac_pred;

  2752.     int scale;

  2753.     int q1, q2 = 0;

  2754. 

  2755.     /* XXX: Guard against dumb values of mquant */

  2756.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2757. 

  2758.     /* Set DC scale - y and c use the same */

  2759.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2760.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2761. 

  2762.     /* Get DC differential */

  2763.     if (n < 4) {

  2764.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2765.     } else {

  2766.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2767.     }

  2768.     if (dcdiff < 0){

  2769.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2770.         return -1;

  2771.     }

  2772.     if (dcdiff)

  2773.     {

  2774.         if (dcdiff == 119 /* ESC index value */)

  2775.         {

  2776.             /* TODO: Optimize */

  2777.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2778.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2779.             else dcdiff = get_bits(gb, 8);

  2780.         }

  2781.         else

  2782.         {

  2783.             if (mquant == 1)

  2784.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2785.             else if (mquant == 2)

  2786.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2787.         }

  2788.         if (get_bits(gb, 1))

  2789.             dcdiff = -dcdiff;

  2790.     }

  2791. 

  2792.     /* Prediction */

  2793.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2794.     *dc_val = dcdiff;

  2795. 

  2796.     /* Store the quantized DC coeff, used for prediction */

  2797. 

  2798.     if (n < 4) {

  2799.         block[0] = dcdiff * s->y_dc_scale;

  2800.     } else {

  2801.         block[0] = dcdiff * s->c_dc_scale;

  2802.     }

  2803.     /* Skip ? */

  2804.     run_diff = 0;

  2805.     i = 0;

  2806. 

  2807.     //AC Decoding

  2808.     i = 1;

  2809. 

  2810.     /* check if AC is needed at all and adjust direction if needed */

  2811.     if(!a_avail) dc_pred_dir = 1;

  2812.     if(!c_avail) dc_pred_dir = 0;

  2813.     if(!a_avail && !c_avail) use_pred = 0;

  2814.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2815.     ac_val2 = ac_val;

  2816. 

  2817.     scale = mquant * 2 + v->halfpq;

  2818. 

  2819.     if(dc_pred_dir) //left

  2820.         ac_val -= 16;

  2821.     else //top

  2822.         ac_val -= 16 * s->block_wrap[n];

  2823. 

  2824.     q1 = s->current_picture.qscale_table[mb_pos];

  2825.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2826.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2827.     if(dc_pred_dir && n==1) q2 = q1;

  2828.     if(!dc_pred_dir && n==2) q2 = q1;

  2829.     if(n==3) q2 = q1;

  2830. 

  2831.     if(coded) {

  2832.         int last = 0, skip, value;

  2833.         const int8_t *zz_table;

  2834.         int k;

  2835. 

  2836.         zz_table = ff_vc1_simple_progressive_8x8_zz;

  2837. 

  2838.         while (!last) {

  2839.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2840.             i += skip;

  2841.             if(i > 63)

  2842.                 break;

  2843.             block[zz_table[i++]] = value;

  2844.         }

  2845. 

  2846.         /* apply AC prediction if needed */

  2847.         if(use_pred) {

  2848.             /* scale predictors if needed*/

  2849.             if(q2 && q1!=q2) {

  2850.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2851.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2852. 

  2853.                 if(dc_pred_dir) { //left

  2854.                     for(k = 1; k < 8; k++)

  2855.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2856.                 } else { //top

  2857.                     for(k = 1; k < 8; k++)

  2858.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2859.                 }

  2860.             } else {

  2861.                 if(dc_pred_dir) { //left

  2862.                     for(k = 1; k < 8; k++)

  2863.                         block[k << 3] += ac_val[k];

  2864.                 } else { //top

  2865.                     for(k = 1; k < 8; k++)

  2866.                         block[k] += ac_val[k + 8];

  2867.                 }

  2868.             }

  2869.         }

  2870.         /* save AC coeffs for further prediction */

  2871.         for(k = 1; k < 8; k++) {

  2872.             ac_val2[k] = block[k << 3];

  2873.             ac_val2[k + 8] = block[k];

  2874.         }

  2875. 

  2876.         /* scale AC coeffs */

  2877.         for(k = 1; k < 64; k++)

  2878.             if(block[k]) {

  2879.                 block[k] *= scale;

  2880.                 if(!v->pquantizer)

  2881.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2882.             }

  2883. 

  2884.         if(use_pred) i = 63;

  2885.     } else { // no AC coeffs

  2886.         int k;

  2887. 

  2888.         memset(ac_val2, 0, 16 * 2);

  2889.         if(dc_pred_dir) {//left

  2890.             if(use_pred) {

  2891.                 memcpy(ac_val2, ac_val, 8 * 2);

  2892.                 if(q2 && q1!=q2) {

  2893.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2894.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2895.                     for(k = 1; k < 8; k++)

  2896.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2897.                 }

  2898.             }

  2899.         } else {//top

  2900.             if(use_pred) {

  2901.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2902.                 if(q2 && q1!=q2) {

  2903.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2904.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2905.                     for(k = 1; k < 8; k++)

  2906.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2907.                 }

  2908.             }

  2909.         }

  2910. 

  2911.         /* apply AC prediction if needed */

  2912.         if(use_pred) {

  2913.             if(dc_pred_dir) { //left

  2914.                 for(k = 1; k < 8; k++) {

  2915.                     block[k << 3] = ac_val2[k] * scale;

  2916.                     if(!v->pquantizer && block[k << 3])

  2917.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2918.                 }

  2919.             } else { //top

  2920.                 for(k = 1; k < 8; k++) {

  2921.                     block[k] = ac_val2[k + 8] * scale;

  2922.                     if(!v->pquantizer && block[k])

  2923.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2924.                 }

  2925.             }

  2926.             i = 63;

  2927.         }

  2928.     }

  2929.     s->block_last_index[n] = i;

  2930. 

  2931.     return 0;

  2932. }

  2933. 

  2934. /** Decode P block

  2935.  */

  2936. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2937. {

  2938.     MpegEncContext *s = &v->s;

  2939.     GetBitContext *gb = &s->gb;

  2940.     int i, j;

  2941.     int subblkpat = 0;

  2942.     int scale, off, idx, last, skip, value;

  2943.     int ttblk = ttmb & 7;

  2944. 

  2945.     if(ttmb == -1) {

  2946.         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)];

  2947.     }

  2948.     if(ttblk == TT_4X4) {

  2949.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2950.     }

  2951.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2952.         subblkpat = decode012(gb);

  2953.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2954.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2955.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2956.     }

  2957.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  2958. 

  2959.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2960.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2961.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2962.         ttblk = TT_8X4;

  2963.     }

  2964.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2965.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2966.         ttblk = TT_4X8;

  2967.     }

  2968.     switch(ttblk) {

  2969.     case TT_8X8:

  2970.         i = 0;

  2971.         last = 0;

  2972.         while (!last) {

  2973.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2974.             i += skip;

  2975.             if(i > 63)

  2976.                 break;

  2977.             idx = ff_vc1_simple_progressive_8x8_zz[i++];

  2978.             block[idx] = value * scale;

  2979.             if(!v->pquantizer)

  2980.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2981.         }

  2982.         s->dsp.vc1_inv_trans_8x8(block);

  2983.         break;

  2984.     case TT_4X4:

  2985.         for(j = 0; j < 4; j++) {

  2986.             last = subblkpat & (1 << (3 - j));

  2987.             i = 0;

  2988.             off = (j & 1) * 4 + (j & 2) * 16;

  2989.             while (!last) {

  2990.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2991.                 i += skip;

  2992.                 if(i > 15)

  2993.                     break;

  2994.                 idx = ff_vc1_simple_progressive_4x4_zz[i++];

  2995.                 block[idx + off] = value * scale;

  2996.                 if(!v->pquantizer)

  2997.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2998.             }

  2999.             if(!(subblkpat & (1 << (3 - j))))

  3000.                 s->dsp.vc1_inv_trans_4x4(block, j);

  3001.         }

  3002.         break;

  3003.     case TT_8X4:

  3004.         for(j = 0; j < 2; j++) {

  3005.             last = subblkpat & (1 << (1 - j));

  3006.             i = 0;

  3007.             off = j * 32;

  3008.             while (!last) {

  3009.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3010.                 i += skip;

  3011.                 if(i > 31)

  3012.                     break;

  3013.                 if(v->profile < PROFILE_ADVANCED)

  3014.                     idx = ff_vc1_simple_progressive_8x4_zz[i++];

  3015.                 else

  3016.                     idx = ff_vc1_adv_progressive_8x4_zz[i++];

  3017.                 block[idx + off] = value * scale;

  3018.                 if(!v->pquantizer)

  3019.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3020.             }

  3021.             if(!(subblkpat & (1 << (1 - j))))

  3022.                 s->dsp.vc1_inv_trans_8x4(block, j);

  3023.         }

  3024.         break;

  3025.     case TT_4X8:

  3026.         for(j = 0; j < 2; j++) {

  3027.             last = subblkpat & (1 << (1 - j));

  3028.             i = 0;

  3029.             off = j * 4;

  3030.             while (!last) {

  3031.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3032.                 i += skip;

  3033.                 if(i > 31)

  3034.                     break;

  3035.                 if(v->profile < PROFILE_ADVANCED)

  3036.                     idx = ff_vc1_simple_progressive_4x8_zz[i++];

  3037.                 else

  3038.                     idx = ff_vc1_adv_progressive_4x8_zz[i++];

  3039.                 block[idx + off] = value * scale;

  3040.                 if(!v->pquantizer)

  3041.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3042.             }

  3043.             if(!(subblkpat & (1 << (1 - j))))

  3044.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3045.         }

  3046.         break;

  3047.     }

  3048.     return 0;

  3049. }

  3050. 

  3051. 

  3052. /** Decode one P-frame MB (in Simple/Main profile)

  3053.  */

  3054. static int vc1_decode_p_mb(VC1Context *v)

  3055. {

  3056.     MpegEncContext *s = &v->s;

  3057.     GetBitContext *gb = &s->gb;

  3058.     int i, j;

  3059.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3060.     int cbp; /* cbp decoding stuff */

  3061.     int mqdiff, mquant; /* MB quantization */

  3062.     int ttmb = v->ttfrm; /* MB Transform type */

  3063.     int status;

  3064. 

  3065.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3066.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3067.     int mb_has_coeffs = 1; /* last_flag */

  3068.     int dmv_x, dmv_y; /* Differential MV components */

  3069.     int index, index1; /* LUT indices */

  3070.     int val, sign; /* temp values */

  3071.     int first_block = 1;

  3072.     int dst_idx, off;

  3073.     int skipped, fourmv;

  3074. 

  3075.     mquant = v->pq; /* Loosy initialization */

  3076. 

  3077.     if (v->mv_type_is_raw)

  3078.         fourmv = get_bits1(gb);

  3079.     else

  3080.         fourmv = v->mv_type_mb_plane[mb_pos];

  3081.     if (v->skip_is_raw)

  3082.         skipped = get_bits1(gb);

  3083.     else

  3084.         skipped = v->s.mbskip_table[mb_pos];

  3085. 

  3086.     s->dsp.clear_blocks(s->block[0]);

  3087. 

  3088.     if (!fourmv) /* 1MV mode */

  3089.     {

  3090.         if (!skipped)

  3091.         {

  3092.             GET_MVDATA(dmv_x, dmv_y);

  3093. 

  3094.             if (s->mb_intra) {

  3095.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3096.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3097.             }

  3098.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3099.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3100. 

  3101.             /* FIXME Set DC val for inter block ? */

  3102.             if (s->mb_intra && !mb_has_coeffs)

  3103.             {

  3104.                 GET_MQUANT();

  3105.                 s->ac_pred = get_bits(gb, 1);

  3106.                 cbp = 0;

  3107.             }

  3108.             else if (mb_has_coeffs)

  3109.             {

  3110.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  3111.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3112.                 GET_MQUANT();

  3113.             }

  3114.             else

  3115.             {

  3116.                 mquant = v->pq;

  3117.                 cbp = 0;

  3118.             }

  3119.             s->current_picture.qscale_table[mb_pos] = mquant;

  3120. 

  3121.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3122.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3123.                                 VC1_TTMB_VLC_BITS, 2);

  3124.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3125.             dst_idx = 0;

  3126.             for (i=0; i<6; i++)

  3127.             {

  3128.                 s->dc_val[0][s->block_index[i]] = 0;

  3129.                 dst_idx += i >> 2;

  3130.                 val = ((cbp >> (5 - i)) & 1);

  3131.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3132.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3133.                 if(s->mb_intra) {

  3134.                     /* check if prediction blocks A and C are available */

  3135.                     v->a_avail = v->c_avail = 0;

  3136.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3137.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3138.                     if(i == 1 || i == 3 || s->mb_x)

  3139.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3140. 

  3141.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3142.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3143.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3144.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3145.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3146.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3147.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3148.                     if(v->pq >= 9 && v->overlap) {

  3149.                         if(v->c_avail)

  3150.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3151.                         if(v->a_avail)

  3152.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3153.                     }

  3154.                 } else if(val) {

  3155.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3156.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3157.                     first_block = 0;

  3158.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3159.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3160.                 }

  3161.             }

  3162.         }

  3163.         else //Skipped

  3164.         {

  3165.             s->mb_intra = 0;

  3166.             for(i = 0; i < 6; i++) {

  3167.                 v->mb_type[0][s->block_index[i]] = 0;

  3168.                 s->dc_val[0][s->block_index[i]] = 0;

  3169.             }

  3170.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3171.             s->current_picture.qscale_table[mb_pos] = 0;

  3172.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3173.             vc1_mc_1mv(v, 0);

  3174.             return 0;

  3175.         }

  3176.     } //1MV mode

  3177.     else //4MV mode

  3178.     {

  3179.         if (!skipped /* unskipped MB */)

  3180.         {

  3181.             int intra_count = 0, coded_inter = 0;

  3182.             int is_intra[6], is_coded[6];

  3183.             /* Get CBPCY */

  3184.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3185.             for (i=0; i<6; i++)

  3186.             {

  3187.                 val = ((cbp >> (5 - i)) & 1);

  3188.                 s->dc_val[0][s->block_index[i]] = 0;

  3189.                 s->mb_intra = 0;

  3190.                 if(i < 4) {

  3191.                     dmv_x = dmv_y = 0;

  3192.                     s->mb_intra = 0;

  3193.                     mb_has_coeffs = 0;

  3194.                     if(val) {

  3195.                         GET_MVDATA(dmv_x, dmv_y);

  3196.                     }

  3197.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3198.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3199.                     intra_count += s->mb_intra;

  3200.                     is_intra[i] = s->mb_intra;

  3201.                     is_coded[i] = mb_has_coeffs;

  3202.                 }

  3203.                 if(i&4){

  3204.                     is_intra[i] = (intra_count >= 3);

  3205.                     is_coded[i] = val;

  3206.                 }

  3207.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3208.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3209.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3210.             }

  3211.             // if there are no coded blocks then don't do anything more

  3212.             if(!intra_count && !coded_inter) return 0;

  3213.             dst_idx = 0;

  3214.             GET_MQUANT();

  3215.             s->current_picture.qscale_table[mb_pos] = mquant;

  3216.             /* test if block is intra and has pred */

  3217.             {

  3218.                 int intrapred = 0;

  3219.                 for(i=0; i<6; i++)

  3220.                     if(is_intra[i]) {

  3221.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3222.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3223.                             intrapred = 1;

  3224.                             break;

  3225.                         }

  3226.                     }

  3227.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  3228.                 else s->ac_pred = 0;

  3229.             }

  3230.             if (!v->ttmbf && coded_inter)

  3231.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3232.             for (i=0; i<6; i++)

  3233.             {

  3234.                 dst_idx += i >> 2;

  3235.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3236.                 s->mb_intra = is_intra[i];

  3237.                 if (is_intra[i]) {

  3238.                     /* check if prediction blocks A and C are available */

  3239.                     v->a_avail = v->c_avail = 0;

  3240.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3241.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3242.                     if(i == 1 || i == 3 || s->mb_x)

  3243.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3244. 

  3245.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3246.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3247.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3248.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3249.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3250.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3251.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3252.                     if(v->pq >= 9 && v->overlap) {

  3253.                         if(v->c_avail)

  3254.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3255.                         if(v->a_avail)

  3256.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3257.                     }

  3258.                 } else if(is_coded[i]) {

  3259.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3260.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3261.                     first_block = 0;

  3262.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3263.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3264.                 }

  3265.             }

  3266.             return status;

  3267.         }

  3268.         else //Skipped MB

  3269.         {

  3270.             s->mb_intra = 0;

  3271.             s->current_picture.qscale_table[mb_pos] = 0;

  3272.             for (i=0; i<6; i++) {

  3273.                 v->mb_type[0][s->block_index[i]] = 0;

  3274.                 s->dc_val[0][s->block_index[i]] = 0;

  3275.             }

  3276.             for (i=0; i<4; i++)

  3277.             {

  3278.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3279.                 vc1_mc_4mv_luma(v, i);

  3280.             }

  3281.             vc1_mc_4mv_chroma(v);

  3282.             s->current_picture.qscale_table[mb_pos] = 0;

  3283.             return 0;

  3284.         }

  3285.     }

  3286. 

  3287.     /* Should never happen */

  3288.     return -1;

  3289. }

  3290. 

  3291. /** Decode one B-frame MB (in Main profile)

  3292.  */

  3293. static void vc1_decode_b_mb(VC1Context *v)

  3294. {

  3295.     MpegEncContext *s = &v->s;

  3296.     GetBitContext *gb = &s->gb;

  3297.     int i, j;

  3298.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3299.     int cbp = 0; /* cbp decoding stuff */

  3300.     int mqdiff, mquant; /* MB quantization */

  3301.     int ttmb = v->ttfrm; /* MB Transform type */

  3302. 

  3303.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3304.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3305.     int mb_has_coeffs = 0; /* last_flag */

  3306.     int index, index1; /* LUT indices */

  3307.     int val, sign; /* temp values */

  3308.     int first_block = 1;

  3309.     int dst_idx, off;

  3310.     int skipped, direct;

  3311.     int dmv_x[2], dmv_y[2];

  3312.     int bmvtype = BMV_TYPE_BACKWARD;

  3313. 

  3314.     mquant = v->pq; /* Loosy initialization */

  3315.     s->mb_intra = 0;

  3316. 

  3317.     if (v->dmb_is_raw)

  3318.         direct = get_bits1(gb);

  3319.     else

  3320.         direct = v->direct_mb_plane[mb_pos];

  3321.     if (v->skip_is_raw)

  3322.         skipped = get_bits1(gb);

  3323.     else

  3324.         skipped = v->s.mbskip_table[mb_pos];

  3325. 

  3326.     s->dsp.clear_blocks(s->block[0]);

  3327.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3328.     for(i = 0; i < 6; i++) {

  3329.         v->mb_type[0][s->block_index[i]] = 0;

  3330.         s->dc_val[0][s->block_index[i]] = 0;

  3331.     }

  3332.     s->current_picture.qscale_table[mb_pos] = 0;

  3333. 

  3334.     if (!direct) {

  3335.         if (!skipped) {

  3336.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3337.             dmv_x[1] = dmv_x[0];

  3338.             dmv_y[1] = dmv_y[0];

  3339.         }

  3340.         if(skipped || !s->mb_intra) {

  3341.             bmvtype = decode012(gb);

  3342.             switch(bmvtype) {

  3343.             case 0:

  3344.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3345.                 break;

  3346.             case 1:

  3347.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3348.                 break;

  3349.             case 2:

  3350.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3351.                 dmv_x[0] = dmv_y[0] = 0;

  3352.             }

  3353.         }

  3354.     }

  3355.     for(i = 0; i < 6; i++)

  3356.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3357. 

  3358.     if (skipped) {

  3359.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3360.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3361.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3362.         return;

  3363.     }

  3364.     if (direct) {

  3365.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3366.         GET_MQUANT();

  3367.         s->mb_intra = 0;

  3368.         mb_has_coeffs = 0;

  3369.         s->current_picture.qscale_table[mb_pos] = mquant;

  3370.         if(!v->ttmbf)

  3371.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3372.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3373.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3374.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3375.     } else {

  3376.         if(!mb_has_coeffs && !s->mb_intra) {

  3377.             /* no coded blocks - effectively skipped */

  3378.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3379.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3380.             return;

  3381.         }

  3382.         if(s->mb_intra && !mb_has_coeffs) {

  3383.             GET_MQUANT();

  3384.             s->current_picture.qscale_table[mb_pos] = mquant;

  3385.             s->ac_pred = get_bits1(gb);

  3386.             cbp = 0;

  3387.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3388.         } else {

  3389.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3390.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3391.                 if(!mb_has_coeffs) {

  3392.                     /* interpolated skipped block */

  3393.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3394.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3395.                     return;

  3396.                 }

  3397.             }

  3398.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3399.             if(!s->mb_intra) {

  3400.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3401.             }

  3402.             if(s->mb_intra)

  3403.                 s->ac_pred = get_bits1(gb);

  3404.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3405.             GET_MQUANT();

  3406.             s->current_picture.qscale_table[mb_pos] = mquant;

  3407.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3408.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3409.         }

  3410.     }

  3411.     dst_idx = 0;

  3412.     for (i=0; i<6; i++)

  3413.     {

  3414.         s->dc_val[0][s->block_index[i]] = 0;

  3415.         dst_idx += i >> 2;

  3416.         val = ((cbp >> (5 - i)) & 1);

  3417.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3418.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3419.         if(s->mb_intra) {

  3420.             /* check if prediction blocks A and C are available */

  3421.             v->a_avail = v->c_avail = 0;

  3422.             if(i == 2 || i == 3 || !s->first_slice_line)

  3423.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3424.             if(i == 1 || i == 3 || s->mb_x)

  3425.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3426. 

  3427.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3428.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3429.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3430.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3431.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3432.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3433.         } else if(val) {

  3434.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3435.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3436.             first_block = 0;

  3437.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3438.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3439.         }

  3440.     }

  3441. }

  3442. 

  3443. /** Decode blocks of I-frame

  3444.  */

  3445. static void vc1_decode_i_blocks(VC1Context *v)

  3446. {

  3447.     int k, j;

  3448.     MpegEncContext *s = &v->s;

  3449.     int cbp, val;

  3450.     uint8_t *coded_val;

  3451.     int mb_pos;

  3452. 

  3453.     /* select codingmode used for VLC tables selection */

  3454.     switch(v->y_ac_table_index){

  3455.     case 0:

  3456.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3457.         break;

  3458.     case 1:

  3459.         v->codingset = CS_HIGH_MOT_INTRA;

  3460.         break;

  3461.     case 2:

  3462.         v->codingset = CS_MID_RATE_INTRA;

  3463.         break;

  3464.     }

  3465. 

  3466.     switch(v->c_ac_table_index){

  3467.     case 0:

  3468.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3469.         break;

  3470.     case 1:

  3471.         v->codingset2 = CS_HIGH_MOT_INTER;

  3472.         break;

  3473.     case 2:

  3474.         v->codingset2 = CS_MID_RATE_INTER;

  3475.         break;

  3476.     }

  3477. 

  3478.     /* Set DC scale - y and c use the same */

  3479.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3480.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3481. 

  3482.     //do frame decode

  3483.     s->mb_x = s->mb_y = 0;

  3484.     s->mb_intra = 1;

  3485.     s->first_slice_line = 1;

  3486.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3487.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3488.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3489.             ff_init_block_index(s);

  3490.             ff_update_block_index(s);

  3491.             s->dsp.clear_blocks(s->block[0]);

  3492.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3493.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3494.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3495.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3496.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3497. 

  3498.             // do actual MB decoding and displaying

  3499.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3500.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  3501. 

  3502.             for(k = 0; k < 6; k++) {

  3503.                 val = ((cbp >> (5 - k)) & 1);

  3504. 

  3505.                 if (k < 4) {

  3506.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3507.                     val = val ^ pred;

  3508.                     *coded_val = val;

  3509.                 }

  3510.                 cbp |= val << (5 - k);

  3511. 

  3512.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3513. 

  3514.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3515.                 if(!v->res_fasttx && !v->res_x8) for(j = 0; j < 64; j++) s->block[k][j] -= 16;

  3516.                 if(v->pq >= 9 && v->overlap) {

  3517.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3518.                 }

  3519.             }

  3520. 

  3521.             vc1_put_block(v, s->block);

  3522.             if(v->pq >= 9 && v->overlap) {

  3523.                 if(s->mb_x) {

  3524.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3525.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3526.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3527.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3528.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3529.                     }

  3530.                 }

  3531.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3532.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3533.                 if(!s->first_slice_line) {

  3534.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3535.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3536.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3537.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3538.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3539.                     }

  3540.                 }

  3541.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3542.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3543.             }

  3544. 

  3545.             if(get_bits_count(&s->gb) > v->bits) {

  3546.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3547.                 return;

  3548.             }

  3549.         }

  3550.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3551.         s->first_slice_line = 0;

  3552.     }

  3553. }

  3554. 

  3555. /** Decode blocks of I-frame for advanced profile

  3556.  */

  3557. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3558. {

  3559.     int k, j;

  3560.     MpegEncContext *s = &v->s;

  3561.     int cbp, val;

  3562.     uint8_t *coded_val;

  3563.     int mb_pos;

  3564.     int mquant = v->pq;

  3565.     int mqdiff;

  3566.     int overlap;

  3567.     GetBitContext *gb = &s->gb;

  3568. 

  3569.     /* select codingmode used for VLC tables selection */

  3570.     switch(v->y_ac_table_index){

  3571.     case 0:

  3572.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3573.         break;

  3574.     case 1:

  3575.         v->codingset = CS_HIGH_MOT_INTRA;

  3576.         break;

  3577.     case 2:

  3578.         v->codingset = CS_MID_RATE_INTRA;

  3579.         break;

  3580.     }

  3581. 

  3582.     switch(v->c_ac_table_index){

  3583.     case 0:

  3584.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3585.         break;

  3586.     case 1:

  3587.         v->codingset2 = CS_HIGH_MOT_INTER;

  3588.         break;

  3589.     case 2:

  3590.         v->codingset2 = CS_MID_RATE_INTER;

  3591.         break;

  3592.     }

  3593. 

  3594.     //do frame decode

  3595.     s->mb_x = s->mb_y = 0;

  3596.     s->mb_intra = 1;

  3597.     s->first_slice_line = 1;

  3598.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3599.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3600.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3601.             ff_init_block_index(s);

  3602.             ff_update_block_index(s);

  3603.             s->dsp.clear_blocks(s->block[0]);

  3604.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3605.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3606.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3607.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3608. 

  3609.             // do actual MB decoding and displaying

  3610.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3611.             if(v->acpred_is_raw)

  3612.                 v->s.ac_pred = get_bits(&v->s.gb, 1);

  3613.             else

  3614.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3615. 

  3616.             if(v->condover == CONDOVER_SELECT) {

  3617.                 if(v->overflg_is_raw)

  3618.                     overlap = get_bits(&v->s.gb, 1);

  3619.                 else

  3620.                     overlap = v->over_flags_plane[mb_pos];

  3621.             } else

  3622.                 overlap = (v->condover == CONDOVER_ALL);

  3623. 

  3624.             GET_MQUANT();

  3625. 

  3626.             s->current_picture.qscale_table[mb_pos] = mquant;

  3627.             /* Set DC scale - y and c use the same */

  3628.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3629.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3630. 

  3631.             for(k = 0; k < 6; k++) {

  3632.                 val = ((cbp >> (5 - k)) & 1);

  3633. 

  3634.                 if (k < 4) {

  3635.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3636.                     val = val ^ pred;

  3637.                     *coded_val = val;

  3638.                 }

  3639.                 cbp |= val << (5 - k);

  3640. 

  3641.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3642.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3643. 

  3644.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3645. 

  3646.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3647.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3648.             }

  3649. 

  3650.             vc1_put_block(v, s->block);

  3651.             if(overlap) {

  3652.                 if(s->mb_x) {

  3653.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3654.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3655.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3656.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3657.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3658.                     }

  3659.                 }

  3660.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3661.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3662.                 if(!s->first_slice_line) {

  3663.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3664.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3665.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3666.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3667.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3668.                     }

  3669.                 }

  3670.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3671.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3672.             }

  3673. 

  3674.             if(get_bits_count(&s->gb) > v->bits) {

  3675.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3676.                 return;

  3677.             }

  3678.         }

  3679.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3680.         s->first_slice_line = 0;

  3681.     }

  3682. }

  3683. 

  3684. static void vc1_decode_p_blocks(VC1Context *v)

  3685. {

  3686.     MpegEncContext *s = &v->s;

  3687. 

  3688.     /* select codingmode used for VLC tables selection */

  3689.     switch(v->c_ac_table_index){

  3690.     case 0:

  3691.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3692.         break;

  3693.     case 1:

  3694.         v->codingset = CS_HIGH_MOT_INTRA;

  3695.         break;

  3696.     case 2:

  3697.         v->codingset = CS_MID_RATE_INTRA;

  3698.         break;

  3699.     }

  3700. 

  3701.     switch(v->c_ac_table_index){

  3702.     case 0:

  3703.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3704.         break;

  3705.     case 1:

  3706.         v->codingset2 = CS_HIGH_MOT_INTER;

  3707.         break;

  3708.     case 2:

  3709.         v->codingset2 = CS_MID_RATE_INTER;

  3710.         break;

  3711.     }

  3712. 

  3713.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3714.     s->first_slice_line = 1;

  3715.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3716.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3717.             ff_init_block_index(s);

  3718.             ff_update_block_index(s);

  3719.             s->dsp.clear_blocks(s->block[0]);

  3720. 

  3721.             vc1_decode_p_mb(v);

  3722.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3723.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n", get_bits_count(&s->gb), v->bits,s->mb_x,s->mb_y);

  3724.                 return;

  3725.             }

  3726.         }

  3727.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3728.         s->first_slice_line = 0;

  3729.     }

  3730. }

  3731. 

  3732. static void vc1_decode_b_blocks(VC1Context *v)

  3733. {

  3734.     MpegEncContext *s = &v->s;

  3735. 

  3736.     /* select codingmode used for VLC tables selection */

  3737.     switch(v->c_ac_table_index){

  3738.     case 0:

  3739.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3740.         break;

  3741.     case 1:

  3742.         v->codingset = CS_HIGH_MOT_INTRA;

  3743.         break;

  3744.     case 2:

  3745.         v->codingset = CS_MID_RATE_INTRA;

  3746.         break;

  3747.     }

  3748. 

  3749.     switch(v->c_ac_table_index){

  3750.     case 0:

  3751.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3752.         break;

  3753.     case 1:

  3754.         v->codingset2 = CS_HIGH_MOT_INTER;

  3755.         break;

  3756.     case 2:

  3757.         v->codingset2 = CS_MID_RATE_INTER;

  3758.         break;

  3759.     }

  3760. 

  3761.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3762.     s->first_slice_line = 1;

  3763.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3764.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3765.             ff_init_block_index(s);

  3766.             ff_update_block_index(s);

  3767.             s->dsp.clear_blocks(s->block[0]);

  3768. 

  3769.             vc1_decode_b_mb(v);

  3770.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3771.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n", get_bits_count(&s->gb), v->bits,s->mb_x,s->mb_y);

  3772.                 return;

  3773.             }

  3774.         }

  3775.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3776.         s->first_slice_line = 0;

  3777.     }

  3778. }

  3779. 

  3780. static void vc1_decode_skip_blocks(VC1Context *v)

  3781. {

  3782.     MpegEncContext *s = &v->s;

  3783. 

  3784.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3785.     s->first_slice_line = 1;

  3786.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3787.         s->mb_x = 0;

  3788.         ff_init_block_index(s);

  3789.         ff_update_block_index(s);

  3790.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  3791.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3792.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3793.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3794.         s->first_slice_line = 0;

  3795.     }

  3796.     s->pict_type = P_TYPE;

  3797. }

  3798. 

  3799. static void vc1_decode_blocks(VC1Context *v)

  3800. {

  3801. 

  3802.     v->s.esc3_level_length = 0;

  3803. 

  3804.     switch(v->s.pict_type) {

  3805.     case I_TYPE:

  3806.         if(v->profile == PROFILE_ADVANCED)

  3807.             vc1_decode_i_blocks_adv(v);

  3808.         else

  3809.             vc1_decode_i_blocks(v);

  3810.         break;

  3811.     case P_TYPE:

  3812.         if(v->p_frame_skipped)

  3813.             vc1_decode_skip_blocks(v);

  3814.         else

  3815.             vc1_decode_p_blocks(v);

  3816.         break;

  3817.     case B_TYPE:

  3818.         if(v->bi_type){

  3819.             if(v->profile == PROFILE_ADVANCED)

  3820.                 vc1_decode_i_blocks_adv(v);

  3821.             else

  3822.                 vc1_decode_i_blocks(v);

  3823.         }else

  3824.             vc1_decode_b_blocks(v);

  3825.         break;

  3826.     }

  3827. }

  3828. 

  3829. /** Find VC-1 marker in buffer

  3830.  * @return position where next marker starts or end of buffer if no marker found

  3831.  */

  3832. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  3833. {

  3834.     uint32_t mrk = 0xFFFFFFFF;

  3835. 

  3836.     if(end-src < 4) return end;

  3837.     while(src < end){

  3838.         mrk = (mrk << 8) | *src++;

  3839.         if(IS_MARKER(mrk))

  3840.             return src-4;

  3841.     }

  3842.     return end;

  3843. }

  3844. 

  3845. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  3846. {

  3847.     int dsize = 0, i;

  3848. 

  3849.     if(size < 4){

  3850.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  3851.         return size;

  3852.     }

  3853.     for(i = 0; i < size; i++, src++) {

  3854.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  3855.             dst[dsize++] = src[1];

  3856.             src++;

  3857.             i++;

  3858.         } else

  3859.             dst[dsize++] = *src;

  3860.     }

  3861.     return dsize;

  3862. }

  3863. 

  3864. /** Initialize a VC1/WMV3 decoder

  3865.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3866.  * @todo TODO: Decypher remaining bits in extra_data

  3867.  */

  3868. static int vc1_decode_init(AVCodecContext *avctx)

  3869. {

  3870.     VC1Context *v = avctx->priv_data;

  3871.     MpegEncContext *s = &v->s;

  3872.     GetBitContext gb;

  3873. 

  3874.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3875.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3876.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3877.     else

  3878.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3879.     v->s.avctx = avctx;

  3880.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3881.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3882. 

  3883.     if(ff_h263_decode_init(avctx) < 0)

  3884.         return -1;

  3885.     if (vc1_init_common(v) < 0) return -1;

  3886. 

  3887.     avctx->coded_width = avctx->width;

  3888.     avctx->coded_height = avctx->height;

  3889.     if (avctx->codec_id == CODEC_ID_WMV3)

  3890.     {

  3891.         int count = 0;

  3892. 

  3893.         // looks like WMV3 has a sequence header stored in the extradata

  3894.         // advanced sequence header may be before the first frame

  3895.         // the last byte of the extradata is a version number, 1 for the

  3896.         // samples we can decode

  3897. 

  3898.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3899. 

  3900.         if (decode_sequence_header(avctx, &gb) < 0)

  3901.           return -1;

  3902. 

  3903.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3904.         if (count>0)

  3905.         {

  3906.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3907.                    count, get_bits(&gb, count));

  3908.         }

  3909.         else if (count < 0)

  3910.         {

  3911.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3912.         }

  3913.     } else { // VC1/WVC1

  3914.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  3915.         uint8_t *next; int size, buf2_size;

  3916.         uint8_t *buf2 = NULL;

  3917.         int seq_inited = 0, ep_inited = 0;

  3918. 

  3919.         if(avctx->extradata_size < 16) {

  3920.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  3921.             return -1;

  3922.         }

  3923. 

  3924.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3925.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  3926.         next = start;

  3927.         for(; next < end; start = next){

  3928.             next = find_next_marker(start + 4, end);

  3929.             size = next - start - 4;

  3930.             if(size <= 0) continue;

  3931.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  3932.             init_get_bits(&gb, buf2, buf2_size * 8);

  3933.             switch(AV_RB32(start)){

  3934.             case VC1_CODE_SEQHDR:

  3935.                 if(decode_sequence_header(avctx, &gb) < 0){

  3936.                     av_free(buf2);

  3937.                     return -1;

  3938.                 }

  3939.                 seq_inited = 1;

  3940.                 break;

  3941.             case VC1_CODE_ENTRYPOINT:

  3942.                 if(decode_entry_point(avctx, &gb) < 0){

  3943.                     av_free(buf2);

  3944.                     return -1;

  3945.                 }

  3946.                 ep_inited = 1;

  3947.                 break;

  3948.             }

  3949.         }

  3950.         av_free(buf2);

  3951.         if(!seq_inited || !ep_inited){

  3952.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  3953.             return -1;

  3954.         }

  3955.     }

  3956.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3957.     s->low_delay = !avctx->has_b_frames;

  3958. 

  3959.     s->mb_width = (avctx->coded_width+15)>>4;

  3960.     s->mb_height = (avctx->coded_height+15)>>4;

  3961. 

  3962.     /* Allocate mb bitplanes */

  3963.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3964.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3965.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  3966.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  3967. 

  3968.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3969.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3970.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3971.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3972.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3973. 

  3974.     /* Init coded blocks info */

  3975.     if (v->profile == PROFILE_ADVANCED)

  3976.     {

  3977. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3978. //            return -1;

  3979. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3980. //            return -1;

  3981.     }

  3982. 

  3983.     return 0;

  3984. }

  3985. 

  3986. 

  3987. /** Decode a VC1/WMV3 frame

  3988.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3989.  */

  3990. static int vc1_decode_frame(AVCodecContext *avctx,

  3991.                             void *data, int *data_size,

  3992.                             uint8_t *buf, int buf_size)

  3993. {

  3994.     VC1Context *v = avctx->priv_data;

  3995.     MpegEncContext *s = &v->s;

  3996.     AVFrame *pict = data;

  3997.     uint8_t *buf2 = NULL;

  3998. 

  3999.     /* no supplementary picture */

  4000.     if (buf_size == 0) {

  4001.         /* special case for last picture */

  4002.         if (s->low_delay==0 && s->next_picture_ptr) {

  4003.             *pict= *(AVFrame*)s->next_picture_ptr;

  4004.             s->next_picture_ptr= NULL;

  4005. 

  4006.             *data_size = sizeof(AVFrame);

  4007.         }

  4008. 

  4009.         return 0;

  4010.     }

  4011. 

  4012.     /* We need to set current_picture_ptr before reading the header,

  4013.      * otherwise we cannot store anything in there. */

  4014.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  4015.         int i= ff_find_unused_picture(s, 0);

  4016.         s->current_picture_ptr= &s->picture[i];

  4017.     }

  4018. 

  4019.     //for advanced profile we may need to parse and unescape data

  4020.     if (avctx->codec_id == CODEC_ID_VC1) {

  4021.         int buf_size2 = 0;

  4022.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4023. 

  4024.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  4025.             uint8_t *start, *end, *next;

  4026.             int size;

  4027. 

  4028.             next = buf;

  4029.             for(start = buf, end = buf + buf_size; next < end; start = next){

  4030.                 next = find_next_marker(start + 4, end);

  4031.                 size = next - start - 4;

  4032.                 if(size <= 0) continue;

  4033.                 switch(AV_RB32(start)){

  4034.                 case VC1_CODE_FRAME:

  4035.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4036.                     break;

  4037.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4038.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4039.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4040.                     decode_entry_point(avctx, &s->gb);

  4041.                     break;

  4042.                 case VC1_CODE_SLICE:

  4043.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4044.                     av_free(buf2);

  4045.                     return -1;

  4046.                 }

  4047.             }

  4048.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4049.             uint8_t *divider;

  4050. 

  4051.             divider = find_next_marker(buf, buf + buf_size);

  4052.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4053.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4054.                 return -1;

  4055.             }

  4056. 

  4057.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4058.             // TODO

  4059.             av_free(buf2);return -1;

  4060.         }else{

  4061.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4062.         }

  4063.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4064.     } else

  4065.         init_get_bits(&s->gb, buf, buf_size*8);

  4066.     // do parse frame header

  4067.     if(v->profile < PROFILE_ADVANCED) {

  4068.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4069.             av_free(buf2);

  4070.             return -1;

  4071.         }

  4072.     } else {

  4073.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4074.             av_free(buf2);

  4075.             return -1;

  4076.         }

  4077.     }

  4078. 

  4079.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4080.         av_free(buf2);

  4081.         return -1;

  4082.     }

  4083. 

  4084.     // for hurry_up==5

  4085.     s->current_picture.pict_type= s->pict_type;

  4086.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4087. 

  4088.     /* skip B-frames if we don't have reference frames */

  4089.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4090.         av_free(buf2);

  4091.         return -1;//buf_size;

  4092.     }

  4093.     /* skip b frames if we are in a hurry */

  4094.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4095.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4096.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4097.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4098.         av_free(buf2);

  4099.         return buf_size;

  4100.     }

  4101.     /* skip everything if we are in a hurry>=5 */

  4102.     if(avctx->hurry_up>=5) {

  4103.         av_free(buf2);

  4104.         return -1;//buf_size;

  4105.     }

  4106. 

  4107.     if(s->next_p_frame_damaged){

  4108.         if(s->pict_type==B_TYPE)

  4109.             return buf_size;

  4110.         else

  4111.             s->next_p_frame_damaged=0;

  4112.     }

  4113. 

  4114.     if(MPV_frame_start(s, avctx) < 0) {

  4115.         av_free(buf2);

  4116.         return -1;

  4117.     }

  4118. 

  4119.     ff_er_frame_start(s);

  4120. 

  4121.     v->bits = buf_size * 8;

  4122.     vc1_decode_blocks(v);

  4123. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4124. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4125. //      return -1;

  4126.     ff_er_frame_end(s);

  4127. 

  4128.     MPV_frame_end(s);

  4129. 

  4130. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4131. assert(s->current_picture.pict_type == s->pict_type);

  4132.     if (s->pict_type == B_TYPE || s->low_delay) {

  4133.         *pict= *(AVFrame*)s->current_picture_ptr;

  4134.     } else if (s->last_picture_ptr != NULL) {

  4135.         *pict= *(AVFrame*)s->last_picture_ptr;

  4136.     }

  4137. 

  4138.     if(s->last_picture_ptr || s->low_delay){

  4139.         *data_size = sizeof(AVFrame);

  4140.         ff_print_debug_info(s, pict);

  4141.     }

  4142. 

  4143.     /* Return the Picture timestamp as the frame number */

  4144.     /* we substract 1 because it is added on utils.c    */

  4145.     avctx->frame_number = s->picture_number - 1;

  4146. 

  4147.     av_free(buf2);

  4148.     return buf_size;

  4149. }

  4150. 

  4151. 

  4152. /** Close a VC1/WMV3 decoder

  4153.  * @warning Initial try at using MpegEncContext stuff

  4154.  */

  4155. static int vc1_decode_end(AVCodecContext *avctx)

  4156. {

  4157.     VC1Context *v = avctx->priv_data;

  4158. 

  4159.     av_freep(&v->hrd_rate);

  4160.     av_freep(&v->hrd_buffer);

  4161.     MPV_common_end(&v->s);

  4162.     av_freep(&v->mv_type_mb_plane);

  4163.     av_freep(&v->direct_mb_plane);

  4164.     av_freep(&v->acpred_plane);

  4165.     av_freep(&v->over_flags_plane);

  4166.     av_freep(&v->mb_type_base);

  4167.     return 0;

  4168. }

  4169. 

  4170. 

  4171. AVCodec vc1_decoder = {

  4172.     "vc1",

  4173.     CODEC_TYPE_VIDEO,

  4174.     CODEC_ID_VC1,

  4175.     sizeof(VC1Context),

  4176.     vc1_decode_init,

  4177.     NULL,

  4178.     vc1_decode_end,

  4179.     vc1_decode_frame,

  4180.     CODEC_CAP_DELAY,

  4181.     NULL

  4182. };

  4183. 

  4184. AVCodec wmv3_decoder = {

  4185.     "wmv3",

  4186.     CODEC_TYPE_VIDEO,

  4187.     CODEC_ID_WMV3,

  4188.     sizeof(VC1Context),

  4189.     vc1_decode_init,

  4190.     NULL,

  4191.     vc1_decode_end,

  4192.     vc1_decode_frame,

  4193.     CODEC_CAP_DELAY,

  4194.     NULL

  4195. };