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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. /**

  25.  * @file vc1.c

  26.  * VC-1 and WMV3 decoder

  27.  *

  28.  */

  29. #include "dsputil.h"

  30. #include "avcodec.h"

  31. #include "mpegvideo.h"

  32. #include "vc1.h"

  33. #include "vc1data.h"

  34. #include "vc1acdata.h"

  35. #include "msmpeg4data.h"

  36. 

  37. #undef NDEBUG

  38. #include <assert.h>

  39. 

  40. #define MB_INTRA_VLC_BITS 9

  41. #define DC_VLC_BITS 9

  42. #define AC_VLC_BITS 9

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

  44. 

  45. 

  46. /**

  47.  * Get unary code of limited length

  48.  * @fixme FIXME Slow and ugly

  49.  * @param gb GetBitContext

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

  51.  * @param[in] len Maximum length

  52.  * @return Unary length/index

  53.  */

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

  55. {

  56. #if 1

  57.     int i;

  58. 

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

  60.     return i;

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

  62. 

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

  64.   {

  65.     tmp = get_bits(gb, 1);

  66.     i++;

  67.   }

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

  69.   return i;*/

  70. #else

  71.   unsigned int buf;

  72.   int log;

  73. 

  74.   OPEN_READER(re, gb);

  75.   UPDATE_CACHE(re, gb);

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

  77.   if (stop) buf = ~buf;

  78. 

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

  80.   if (log < limit){

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

  82.     CLOSE_READER(re, gb);

  83.     return log;

  84.   }

  85. 

  86.   LAST_SKIP_BITS(re, gb, limit);

  87.   CLOSE_READER(re, gb);

  88.   return limit;

  89. #endif

  90. }

  91. 

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

  93.     int n;

  94.     n = get_bits1(gb);

  95.     if (n == 1)

  96.         return 0;

  97.     else

  98.         return 2 - get_bits1(gb);

  99. }

  100. 

  101. /**

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

  103.  * @param v The VC1Context to initialize

  104.  * @return Status

  105.  */

  106. static int vc1_init_common(VC1Context *v)

  107. {

  108.     static int done = 0;

  109.     int i = 0;

  110. 

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

  112. 

  113.     /* VLC tables */

  114.     if(!done)

  115.     {

  116.         done = 1;

  117.         init_vlc(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  118.                  ff_vc1_bfraction_bits, 1, 1,

  119.                  ff_vc1_bfraction_codes, 1, 1, 1);

  120.         init_vlc(&ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  121.                  ff_vc1_norm2_bits, 1, 1,

  122.                  ff_vc1_norm2_codes, 1, 1, 1);

  123.         init_vlc(&ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  124.                  ff_vc1_norm6_bits, 1, 1,

  125.                  ff_vc1_norm6_codes, 2, 2, 1);

  126.         init_vlc(&ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  127.                  ff_vc1_imode_bits, 1, 1,

  128.                  ff_vc1_imode_codes, 1, 1, 1);

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

  130.         {

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

  132.                      ff_vc1_ttmb_bits[i], 1, 1,

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

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

  135.                      ff_vc1_ttblk_bits[i], 1, 1,

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

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

  138.                      ff_vc1_subblkpat_bits[i], 1, 1,

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

  140.         }

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

  142.         {

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

  144.                      ff_vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  147.                      ff_vc1_cbpcy_p_bits[i], 1, 1,

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

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

  150.                      ff_vc1_mv_diff_bits[i], 1, 1,

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

  152.         }

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

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

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

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

  157.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  160.     }

  161. 

  162.     /* Other defaults */

  163.     v->pq = -1;

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

  165. 

  166.     return 0;

  167. }

  168. 

  169. /***********************************************************************/

  170. /**

  171.  * @defgroup bitplane VC9 Bitplane decoding

  172.  * @see 8.7, p56

  173.  * @{

  174.  */

  175. 

  176. /** @addtogroup bitplane

  177.  * Imode types

  178.  * @{

  179.  */

  180. enum Imode {

  181.     IMODE_RAW,

  182.     IMODE_NORM2,

  183.     IMODE_DIFF2,

  184.     IMODE_NORM6,

  185.     IMODE_DIFF6,

  186.     IMODE_ROWSKIP,

  187.     IMODE_COLSKIP

  188. };

  189. /** @} */ //imode defines

  190. 

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

  192.  * @param plane Buffer to store decoded bits

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

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

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

  196.  */

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

  198.     int x, y;

  199. 

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

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

  202.             memset(plane, 0, width);

  203.         else

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

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

  206.         plane += stride;

  207.     }

  208. }

  209. 

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

  211.  * @param plane Buffer to store decoded bits

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

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

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

  215.  * @fixme FIXME: Optimize

  216.  */

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

  218.     int x, y;

  219. 

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

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

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

  223.                 plane[y*stride] = 0;

  224.         else

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

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

  227.         plane ++;

  228.     }

  229. }

  230. 

  231. /** Decode a bitplane's bits

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

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

  234.  * @return Status

  235.  * @fixme FIXME: Optimize

  236.  */

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

  238. {

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

  240. 

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

  242.     uint8_t invert, *planep = data;

  243.     int width, height, stride;

  244. 

  245.     width = v->s.mb_width;

  246.     height = v->s.mb_height;

  247.     stride = v->s.mb_stride;

  248.     invert = get_bits(gb, 1);

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

  250. 

  251.     *raw_flag = 0;

  252.     switch (imode)

  253.     {

  254.     case IMODE_RAW:

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

  256.         *raw_flag = 1; //invert ignored

  257.         return invert;

  258.     case IMODE_DIFF2:

  259.     case IMODE_NORM2:

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

  261.         {

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

  263.             offset = 1;

  264.         }

  265.         else offset = 0;

  266.         // decode bitplane as one long line

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

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

  269.             *planep++ = code & 1;

  270.             offset++;

  271.             if(offset == width) {

  272.                 offset = 0;

  273.                 planep += stride - width;

  274.             }

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

  276.             offset++;

  277.             if(offset == width) {

  278.                 offset = 0;

  279.                 planep += stride - width;

  280.             }

  281.         }

  282.         break;

  283.     case IMODE_DIFF6:

  284.     case IMODE_NORM6:

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

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

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

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

  289.                     if(code < 0){

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

  291.                         return -1;

  292.                     }

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

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

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

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

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

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

  299.                 }

  300.                 planep += stride * 3;

  301.             }

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

  303.         } else { // 3x2

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

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

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

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

  308.                     if(code < 0){

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

  310.                         return -1;

  311.                     }

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

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

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

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

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

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

  318.                 }

  319.                 planep += stride * 2;

  320.             }

  321.             x = width % 3;

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

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

  324.         }

  325.         break;

  326.     case IMODE_ROWSKIP:

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

  328.         break;

  329.     case IMODE_COLSKIP:

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

  331.         break;

  332.     default: break;

  333.     }

  334. 

  335.     /* Applying diff operator */

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

  337.     {

  338.         planep = data;

  339.         planep[0] ^= invert;

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

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

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

  343.         {

  344.             planep += stride;

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

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

  347.             {

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

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

  350.             }

  351.         }

  352.     }

  353.     else if (invert)

  354.     {

  355.         planep = data;

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

  357.     }

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

  359. }

  360. 

  361. /** @} */ //Bitplane group

  362. 

  363. /***********************************************************************/

  364. /** VOP Dquant decoding

  365.  * @param v VC-1 Context

  366.  */

  367. static int vop_dquant_decoding(VC1Context *v)

  368. {

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

  370.     int pqdiff;

  371. 

  372.     //variable size

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

  374.     {

  375.         pqdiff = get_bits(gb, 3);

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

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

  378.     }

  379.     else

  380.     {

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

  382.         if ( v->dquantfrm )

  383.         {

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

  385.             switch (v->dqprofile)

  386.             {

  387.             case DQPROFILE_SINGLE_EDGE:

  388.             case DQPROFILE_DOUBLE_EDGES:

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

  390.                 break;

  391.             case DQPROFILE_ALL_MBS:

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

  393.             default: break; //Forbidden ?

  394.             }

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

  396.             {

  397.                 pqdiff = get_bits(gb, 3);

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

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

  400.             }

  401.         }

  402.     }

  403.     return 0;

  404. }

  405. 

  406. /** Put block onto picture

  407.  */

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

  409. {

  410.     uint8_t *Y;

  411.     int ys, us, vs;

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

  413. 

  414.     if(v->rangeredfrm) {

  415.         int i, j, k;

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

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

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

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

  420. 

  421.     }

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

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

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

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

  426. 

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

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

  429.     Y += ys * 8;

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

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

  432. 

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

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

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

  436.     }

  437. }

  438. 

  439. /** Do motion compensation over 1 macroblock

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

  441.  */

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

  443. {

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

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

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

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

  448. 

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

  450. 

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

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

  453. 

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

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

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

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

  458.     }

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

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

  461.     if(v->fastuvmc) {

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

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

  464.     }

  465.     if(!dir) {

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

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

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

  469.     } else {

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

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

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

  473.     }

  474. 

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

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

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

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

  479. 

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

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

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

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

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

  485.     }else{

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

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

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

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

  490.     }

  491. 

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

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

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

  495. 

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

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

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

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

  500.     }

  501. 

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

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

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

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

  506. 

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

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

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

  510.         srcY = s->edge_emu_buffer;

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

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

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

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

  515.         srcU = uvbuf;

  516.         srcV = uvbuf + 16;

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

  518.         if(v->rangeredfrm) {

  519.             int i, j;

  520.             uint8_t *src, *src2;

  521. 

  522.             src = srcY;

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

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

  525.                 src += s->linesize;

  526.             }

  527.             src = srcU; src2 = srcV;

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

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

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

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

  532.                 }

  533.                 src += s->uvlinesize;

  534.                 src2 += s->uvlinesize;

  535.             }

  536.         }

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

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

  539.             int i, j;

  540.             uint8_t *src, *src2;

  541. 

  542.             src = srcY;

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

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

  545.                 src += s->linesize;

  546.             }

  547.             src = srcU; src2 = srcV;

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

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

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

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

  552.                 }

  553.                 src += s->uvlinesize;

  554.                 src2 += s->uvlinesize;

  555.             }

  556.         }

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

  558.     }

  559. 

  560.     if(s->mspel) {

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

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

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

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

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

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

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

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

  569. 

  570.         if(!v->rnd)

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

  572.         else

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

  574.     }

  575. 

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

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

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

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

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

  581.     if(!v->rnd){

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

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

  584.     }else{

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

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

  587.     }

  588. }

  589. 

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

  591.  */

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

  593. {

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

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

  596.     uint8_t *srcY;

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

  598.     int off;

  599. 

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

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

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

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

  604. 

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

  606. 

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

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

  609. 

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

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

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

  613.     }else{

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

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

  616.     }

  617. 

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

  619. 

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

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

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

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

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

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

  626.         srcY = s->edge_emu_buffer;

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

  628.         if(v->rangeredfrm) {

  629.             int i, j;

  630.             uint8_t *src;

  631. 

  632.             src = srcY;

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

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

  635.                 src += s->linesize;

  636.             }

  637.         }

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

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

  640.             int i, j;

  641.             uint8_t *src;

  642. 

  643.             src = srcY;

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

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

  646.                 src += s->linesize;

  647.             }

  648.         }

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

  650.     }

  651. 

  652.     if(s->mspel) {

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

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

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

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

  657.         if(!v->rnd)

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

  659.         else

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

  661.     }

  662. }

  663. 

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

  665. {

  666.     if(a < b) {

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

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

  669.     } else {

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

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

  672.     }

  673. }

  674. 

  675. 

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

  677.  */

  678. static void vc1_mc_4mv_chroma(VC1Context *v)

  679. {

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

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

  682.     uint8_t *srcU, *srcV;

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

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

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

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

  687. 

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

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

  690. 

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

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

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

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

  695.     }

  696. 

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

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

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

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

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

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

  703.         switch(idx) {

  704.         case 0x1:

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

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

  707.             break;

  708.         case 0x2:

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

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

  711.             break;

  712.         case 0x4:

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

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

  715.             break;

  716.         case 0x8:

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

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

  719.             break;

  720.         }

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

  722.         int t1 = 0, t2 = 0;

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

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

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

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

  727.     } else {

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

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

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

  731.     }

  732. 

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

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

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

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

  737.     if(v->fastuvmc) {

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

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

  740.     }

  741. 

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

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

  744. 

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

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

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

  748.     }else{

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

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

  751.     }

  752. 

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

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

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

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

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

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

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

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

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

  762.         srcU = s->edge_emu_buffer;

  763.         srcV = s->edge_emu_buffer + 16;

  764. 

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

  766.         if(v->rangeredfrm) {

  767.             int i, j;

  768.             uint8_t *src, *src2;

  769. 

  770.             src = srcU; src2 = srcV;

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

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

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

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

  775.                 }

  776.                 src += s->uvlinesize;

  777.                 src2 += s->uvlinesize;

  778.             }

  779.         }

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

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

  782.             int i, j;

  783.             uint8_t *src, *src2;

  784. 

  785.             src = srcU; src2 = srcV;

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

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

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

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

  790.                 }

  791.                 src += s->uvlinesize;

  792.                 src2 += s->uvlinesize;

  793.             }

  794.         }

  795.     }

  796. 

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

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

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

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

  801.     if(!v->rnd){

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

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

  804.     }else{

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

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

  807.     }

  808. }

  809. 

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

  811. 

  812. /**

  813.  * Decode Simple/Main Profiles sequence header

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

  815.  * @param avctx Codec context

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

  817.  * @return Status

  818.  */

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

  820. {

  821.     VC1Context *v = avctx->priv_data;

  822. 

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

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

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

  826.     {

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

  828.     }

  829. 

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

  831.     {

  832.         return decode_sequence_header_adv(v, gb);

  833.     }

  834.     else

  835.     {

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

  837.         if (v->res_sm)

  838.         {

  839.             av_log(avctx, AV_LOG_ERROR,

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

  841.             return -1;

  842.         }

  843.     }

  844. 

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

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

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

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

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

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

  851.     {

  852.         av_log(avctx, AV_LOG_ERROR,

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

  854.     }

  855. 

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

  857.     if (v->res_x8)

  858.     {

  859.         av_log(avctx, AV_LOG_ERROR,

  860.                "1 for reserved RES_X8 is forbidden\n");

  861.         //return -1;

  862.     }

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

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

  865.     if (!v->res_fasttx)

  866.     {

  867.         av_log(avctx, AV_LOG_ERROR,

  868.                "0 for reserved RES_FASTTX is forbidden\n");

  869.         //return -1;

  870.     }

  871. 

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

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

  874.     {

  875.         av_log(avctx, AV_LOG_ERROR,

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

  877.         return -1;

  878.     }

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

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

  881.     {

  882.         av_log(avctx, AV_LOG_ERROR,

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

  884.         return -1;

  885.     }

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

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

  888. 

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

  890.     if (v->res_transtab)

  891.     {

  892.         av_log(avctx, AV_LOG_ERROR,

  893.                "1 for reserved RES_TRANSTAB is forbidden\n");

  894.         return -1;

  895.     }

  896. 

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

  898. 

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

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

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

  902.     {

  903.         av_log(avctx, AV_LOG_INFO,

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

  905.     }

  906. 

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

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

  909. 

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

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

  912.     if (!v->res_rtm_flag)

  913.     {

  914. //            av_log(avctx, AV_LOG_ERROR,

  915. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  916.         av_log(avctx, AV_LOG_ERROR,

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

  918.         //return -1;

  919.     }

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

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

  922.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  931.                );

  932.     return 0;

  933. }

  934. 

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

  936. {

  937.     v->res_rtm_flag = 1;

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

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

  940.     {

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

  942.     }

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

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

  945.     {

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

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

  948.         return -1;

  949.     }

  950. 

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

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

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

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

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

  956. 

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

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

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

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

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

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

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

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

  965.     get_bits1(gb); // reserved

  966. 

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

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

  969. 

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

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

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

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

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

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

  976.                v->tfcntrflag, v->finterpflag

  977.                );

  978. 

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

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

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

  982.         return -1;

  983.     }

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

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

  986.         int w, h, ar = 0;

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

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

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

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

  991.         if(get_bits1(gb))

  992.             ar = get_bits(gb, 4);

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

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

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

  996.             w = get_bits(gb, 8);

  997.             h = get_bits(gb, 8);

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

  999.         }

  1000. 

  1001.         if(get_bits1(gb)){ //framerate stuff

  1002.             if(get_bits1(gb)) {

  1003.                 v->s.avctx->time_base.num = 32;

  1004.                 v->s.avctx->time_base.den = get_bits(gb, 16) + 1;

  1005.             } else {

  1006.                 int nr, dr;

  1007.                 nr = get_bits(gb, 8);

  1008.                 dr = get_bits(gb, 4);

  1009.                 if(nr && nr < 8 && dr && dr < 3){

  1010.                     v->s.avctx->time_base.num = ff_vc1_fps_dr[dr - 1];

  1011.                     v->s.avctx->time_base.den = ff_vc1_fps_nr[nr - 1] * 1000;

  1012.                 }

  1013.             }

  1014.         }

  1015. 

  1016.         if(get_bits1(gb)){

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

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

  1019.             v->matrix_coef = get_bits(gb, 8);

  1020.         }

  1021.     }

  1022. 

  1023.     v->hrd_param_flag = get_bits1(gb);

  1024.     if(v->hrd_param_flag) {

  1025.         int i;

  1026.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  1027.         get_bits(gb, 4); //bitrate exponent

  1028.         get_bits(gb, 4); //buffer size exponent

  1029.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

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

  1031.             get_bits(gb, 16); //hrd_buffer[n]

  1032.         }

  1033.     }

  1034.     return 0;

  1035. }

  1036. 

  1037. static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)

  1038. {

  1039.     VC1Context *v = avctx->priv_data;

  1040.     int i, blink, clentry, refdist;

  1041. 

  1042.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  1043.     blink = get_bits1(gb); // broken link

  1044.     clentry = get_bits1(gb); // closed entry

  1045.     v->panscanflag = get_bits1(gb);

  1046.     refdist = get_bits1(gb); // refdist flag

  1047.     v->s.loop_filter = get_bits1(gb);

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

  1049.     v->extended_mv = get_bits1(gb);

  1050.     v->dquant = get_bits(gb, 2);

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

  1052.     v->overlap = get_bits1(gb);

  1053.     v->quantizer_mode = get_bits(gb, 2);

  1054. 

  1055.     if(v->hrd_param_flag){

  1056.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1057.             get_bits(gb, 8); //hrd_full[n]

  1058.         }

  1059.     }

  1060. 

  1061.     if(get_bits1(gb)){

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

  1063.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1064.     }

  1065.     if(v->extended_mv)

  1066.         v->extended_dmv = get_bits1(gb);

  1067.     if(get_bits1(gb)) {

  1068.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1069.         skip_bits(gb, 3); // Y range, ignored for now

  1070.     }

  1071.     if(get_bits1(gb)) {

  1072.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1073.         skip_bits(gb, 3); // UV range, ignored for now

  1074.     }

  1075. 

  1076.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1077.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1078.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1079.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1080.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1081.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1082. 

  1083.     return 0;

  1084. }

  1085. 

  1086. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1087. {

  1088.     int pqindex, lowquant, status;

  1089. 

  1090.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1091.     skip_bits(gb, 2); //framecnt unused

  1092.     v->rangeredfrm = 0;

  1093.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1094.     v->s.pict_type = get_bits(gb, 1);

  1095.     if (v->s.avctx->max_b_frames) {

  1096.         if (!v->s.pict_type) {

  1097.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1098.             else v->s.pict_type = B_TYPE;

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

  1100.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1101. 

  1102.     v->bi_type = 0;

  1103.     if(v->s.pict_type == B_TYPE) {

  1104.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1105.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1106.         if(v->bfraction == 0) {

  1107.             v->s.pict_type = BI_TYPE;

  1108.         }

  1109.     }

  1110.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1111.         get_bits(gb, 7); // skip buffer fullness

  1112. 

  1113.     /* calculate RND */

  1114.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1115.         v->rnd = 1;

  1116.     if(v->s.pict_type == P_TYPE)

  1117.         v->rnd ^= 1;

  1118. 

  1119.     /* Quantizer stuff */

  1120.     pqindex = get_bits(gb, 5);

  1121.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1122.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1123.     else

  1124.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1125. 

  1126.     v->pquantizer = 1;

  1127.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1128.         v->pquantizer = pqindex < 9;

  1129.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1130.         v->pquantizer = 0;

  1131.     v->pqindex = pqindex;

  1132.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1133.     else v->halfpq = 0;

  1134.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1135.         v->pquantizer = get_bits(gb, 1);

  1136.     v->dquantfrm = 0;

  1137.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1138.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1139.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1140.     v->range_x = 1 << (v->k_x - 1);

  1141.     v->range_y = 1 << (v->k_y - 1);

  1142.     if (v->profile == PROFILE_ADVANCED)

  1143.     {

  1144.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1145.     }

  1146.     else

  1147.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1148. 

  1149.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1150.         if(get_bits1(gb))return -1;

  1151.     }

  1152. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1153. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1154. 

  1155.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1156. 

  1157.     switch(v->s.pict_type) {

  1158.     case P_TYPE:

  1159.         if (v->pq < 5) v->tt_index = 0;

  1160.         else if(v->pq < 13) v->tt_index = 1;

  1161.         else v->tt_index = 2;

  1162. 

  1163.         lowquant = (v->pq > 12) ? 0 : 1;

  1164.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1165.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1166.         {

  1167.             int scale, shift, i;

  1168.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

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

  1170.             v->lumshift = get_bits(gb, 6);

  1171.             v->use_ic = 1;

  1172.             /* fill lookup tables for intensity compensation */

  1173.             if(!v->lumscale) {

  1174.                 scale = -64;

  1175.                 shift = (255 - v->lumshift * 2) << 6;

  1176.                 if(v->lumshift > 31)

  1177.                     shift += 128 << 6;

  1178.             } else {

  1179.                 scale = v->lumscale + 32;

  1180.                 if(v->lumshift > 31)

  1181.                     shift = (v->lumshift - 64) << 6;

  1182.                 else

  1183.                     shift = v->lumshift << 6;

  1184.             }

  1185.             for(i = 0; i < 256; i++) {

  1186.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1187.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1188.             }

  1189.         }

  1190.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1191.             v->s.quarter_sample = 0;

  1192.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1193.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1194.                 v->s.quarter_sample = 0;

  1195.             else

  1196.                 v->s.quarter_sample = 1;

  1197.         } else

  1198.             v->s.quarter_sample = 1;

  1199.         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));

  1200. 

  1201.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1202.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1203.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1204.         {

  1205.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1206.             if (status < 0) return -1;

  1207.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1208.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1209.         } else {

  1210.             v->mv_type_is_raw = 0;

  1211.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1212.         }

  1213.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1214.         if (status < 0) return -1;

  1215.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1216.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1217. 

  1218.         /* Hopefully this is correct for P frames */

  1219.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1220.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1221. 

  1222.         if (v->dquant)

  1223.         {

  1224.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1225.             vop_dquant_decoding(v);

  1226.         }

  1227. 

  1228.         v->ttfrm = 0; //FIXME Is that so ?

  1229.         if (v->vstransform)

  1230.         {

  1231.             v->ttmbf = get_bits(gb, 1);

  1232.             if (v->ttmbf)

  1233.             {

  1234.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1235.             }

  1236.         } else {

  1237.             v->ttmbf = 1;

  1238.             v->ttfrm = TT_8X8;

  1239.         }

  1240.         break;

  1241.     case B_TYPE:

  1242.         if (v->pq < 5) v->tt_index = 0;

  1243.         else if(v->pq < 13) v->tt_index = 1;

  1244.         else v->tt_index = 2;

  1245. 

  1246.         lowquant = (v->pq > 12) ? 0 : 1;

  1247.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1248.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1249.         v->s.mspel = v->s.quarter_sample;

  1250. 

  1251.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1252.         if (status < 0) return -1;

  1253.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1254.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1255.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1256.         if (status < 0) return -1;

  1257.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1258.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1259. 

  1260.         v->s.mv_table_index = get_bits(gb, 2);

  1261.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1262. 

  1263.         if (v->dquant)

  1264.         {

  1265.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1266.             vop_dquant_decoding(v);

  1267.         }

  1268. 

  1269.         v->ttfrm = 0;

  1270.         if (v->vstransform)

  1271.         {

  1272.             v->ttmbf = get_bits(gb, 1);

  1273.             if (v->ttmbf)

  1274.             {

  1275.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1276.             }

  1277.         } else {

  1278.             v->ttmbf = 1;

  1279.             v->ttfrm = TT_8X8;

  1280.         }

  1281.         break;

  1282.     }

  1283. 

  1284.     /* AC Syntax */

  1285.     v->c_ac_table_index = decode012(gb);

  1286.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1287.     {

  1288.         v->y_ac_table_index = decode012(gb);

  1289.     }

  1290.     /* DC Syntax */

  1291.     v->s.dc_table_index = get_bits(gb, 1);

  1292. 

  1293.     if(v->s.pict_type == BI_TYPE) {

  1294.         v->s.pict_type = B_TYPE;

  1295.         v->bi_type = 1;

  1296.     }

  1297.     return 0;

  1298. }

  1299. 

  1300. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1301. {

  1302.     int pqindex, lowquant;

  1303.     int status;

  1304. 

  1305.     v->p_frame_skipped = 0;

  1306. 

  1307.     if(v->interlace){

  1308.         v->fcm = decode012(gb);

  1309.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1310.     }

  1311.     switch(get_prefix(gb, 0, 4)) {

  1312.     case 0:

  1313.         v->s.pict_type = P_TYPE;

  1314.         break;

  1315.     case 1:

  1316.         v->s.pict_type = B_TYPE;

  1317.         break;

  1318.     case 2:

  1319.         v->s.pict_type = I_TYPE;

  1320.         break;

  1321.     case 3:

  1322.         v->s.pict_type = BI_TYPE;

  1323.         break;

  1324.     case 4:

  1325.         v->s.pict_type = P_TYPE; // skipped pic

  1326.         v->p_frame_skipped = 1;

  1327.         return 0;

  1328.     }

  1329.     if(v->tfcntrflag)

  1330.         get_bits(gb, 8);

  1331.     if(v->broadcast) {

  1332.         if(!v->interlace || v->psf) {

  1333.             v->rptfrm = get_bits(gb, 2);

  1334.         } else {

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

  1336.             v->rptfrm = get_bits1(gb);

  1337.         }

  1338.     }

  1339.     if(v->panscanflag) {

  1340.         //...

  1341.     }

  1342.     v->rnd = get_bits1(gb);

  1343.     if(v->interlace)

  1344.         v->uvsamp = get_bits1(gb);

  1345.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1346.     if(v->s.pict_type == B_TYPE) {

  1347.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1348.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1349.         if(v->bfraction == 0) {

  1350.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1351.         }

  1352.     }

  1353.     pqindex = get_bits(gb, 5);

  1354.     v->pqindex = pqindex;

  1355.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1356.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1357.     else

  1358.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1359. 

  1360.     v->pquantizer = 1;

  1361.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1362.         v->pquantizer = pqindex < 9;

  1363.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1364.         v->pquantizer = 0;

  1365.     v->pqindex = pqindex;

  1366.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1367.     else v->halfpq = 0;

  1368.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1369.         v->pquantizer = get_bits(gb, 1);

  1370. 

  1371.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1372. 

  1373.     switch(v->s.pict_type) {

  1374.     case I_TYPE:

  1375.     case BI_TYPE:

  1376.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1377.         if (status < 0) return -1;

  1378.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1379.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1380.         v->condover = CONDOVER_NONE;

  1381.         if(v->overlap && v->pq <= 8) {

  1382.             v->condover = decode012(gb);

  1383.             if(v->condover == CONDOVER_SELECT) {

  1384.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1385.                 if (status < 0) return -1;

  1386.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1387.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1388.             }

  1389.         }

  1390.         break;

  1391.     case P_TYPE:

  1392.         if(v->postprocflag)

  1393.             v->postproc = get_bits1(gb);

  1394.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1395.         else v->mvrange = 0;

  1396.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1397.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1398.         v->range_x = 1 << (v->k_x - 1);

  1399.         v->range_y = 1 << (v->k_y - 1);

  1400. 

  1401.         if (v->pq < 5) v->tt_index = 0;

  1402.         else if(v->pq < 13) v->tt_index = 1;

  1403.         else v->tt_index = 2;

  1404. 

  1405.         lowquant = (v->pq > 12) ? 0 : 1;

  1406.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1407.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1408.         {

  1409.             int scale, shift, i;

  1410.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

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

  1412.             v->lumshift = get_bits(gb, 6);

  1413.             /* fill lookup tables for intensity compensation */

  1414.             if(!v->lumscale) {

  1415.                 scale = -64;

  1416.                 shift = (255 - v->lumshift * 2) << 6;

  1417.                 if(v->lumshift > 31)

  1418.                     shift += 128 << 6;

  1419.             } else {

  1420.                 scale = v->lumscale + 32;

  1421.                 if(v->lumshift > 31)

  1422.                     shift = (v->lumshift - 64) << 6;

  1423.                 else

  1424.                     shift = v->lumshift << 6;

  1425.             }

  1426.             for(i = 0; i < 256; i++) {

  1427.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1428.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1429.             }

  1430.             v->use_ic = 1;

  1431.         }

  1432.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1433.             v->s.quarter_sample = 0;

  1434.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1435.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1436.                 v->s.quarter_sample = 0;

  1437.             else

  1438.                 v->s.quarter_sample = 1;

  1439.         } else

  1440.             v->s.quarter_sample = 1;

  1441.         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));

  1442. 

  1443.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1444.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1445.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1446.         {

  1447.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1448.             if (status < 0) return -1;

  1449.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1450.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1451.         } else {

  1452.             v->mv_type_is_raw = 0;

  1453.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1454.         }

  1455.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1456.         if (status < 0) return -1;

  1457.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1458.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1459. 

  1460.         /* Hopefully this is correct for P frames */

  1461.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1462.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1463.         if (v->dquant)

  1464.         {

  1465.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1466.             vop_dquant_decoding(v);

  1467.         }

  1468. 

  1469.         v->ttfrm = 0; //FIXME Is that so ?

  1470.         if (v->vstransform)

  1471.         {

  1472.             v->ttmbf = get_bits(gb, 1);

  1473.             if (v->ttmbf)

  1474.             {

  1475.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1476.             }

  1477.         } else {

  1478.             v->ttmbf = 1;

  1479.             v->ttfrm = TT_8X8;

  1480.         }

  1481.         break;

  1482.     case B_TYPE:

  1483.         if(v->postprocflag)

  1484.             v->postproc = get_bits1(gb);

  1485.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1486.         else v->mvrange = 0;

  1487.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1488.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1489.         v->range_x = 1 << (v->k_x - 1);

  1490.         v->range_y = 1 << (v->k_y - 1);

  1491. 

  1492.         if (v->pq < 5) v->tt_index = 0;

  1493.         else if(v->pq < 13) v->tt_index = 1;

  1494.         else v->tt_index = 2;

  1495. 

  1496.         lowquant = (v->pq > 12) ? 0 : 1;

  1497.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1498.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1499.         v->s.mspel = v->s.quarter_sample;

  1500. 

  1501.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1502.         if (status < 0) return -1;

  1503.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1504.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1505.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1506.         if (status < 0) return -1;

  1507.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1508.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1509. 

  1510.         v->s.mv_table_index = get_bits(gb, 2);

  1511.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1512. 

  1513.         if (v->dquant)

  1514.         {

  1515.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1516.             vop_dquant_decoding(v);

  1517.         }

  1518. 

  1519.         v->ttfrm = 0;

  1520.         if (v->vstransform)

  1521.         {

  1522.             v->ttmbf = get_bits(gb, 1);

  1523.             if (v->ttmbf)

  1524.             {

  1525.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1526.             }

  1527.         } else {

  1528.             v->ttmbf = 1;

  1529.             v->ttfrm = TT_8X8;

  1530.         }

  1531.         break;

  1532.     }

  1533. 

  1534.     /* AC Syntax */

  1535.     v->c_ac_table_index = decode012(gb);

  1536.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1537.     {

  1538.         v->y_ac_table_index = decode012(gb);

  1539.     }

  1540.     /* DC Syntax */

  1541.     v->s.dc_table_index = get_bits(gb, 1);

  1542.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1543.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1544.         vop_dquant_decoding(v);

  1545.     }

  1546. 

  1547.     v->bi_type = 0;

  1548.     if(v->s.pict_type == BI_TYPE) {

  1549.         v->s.pict_type = B_TYPE;

  1550.         v->bi_type = 1;

  1551.     }

  1552.     return 0;

  1553. }

  1554. 

  1555. /***********************************************************************/

  1556. /**

  1557.  * @defgroup block VC-1 Block-level functions

  1558.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1559.  * @{

  1560.  */

  1561. 

  1562. /**

  1563.  * @def GET_MQUANT

  1564.  * @brief Get macroblock-level quantizer scale

  1565.  */

  1566. #define GET_MQUANT()                                           \

  1567.   if (v->dquantfrm)                                            \

  1568.   {                                                            \

  1569.     int edges = 0;                                             \

  1570.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1571.     {                                                          \

  1572.       if (v->dqbilevel)                                        \

  1573.       {                                                        \

  1574.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1575.       }                                                        \

  1576.       else                                                     \

  1577.       {                                                        \

  1578.         mqdiff = get_bits(gb, 3);                              \

  1579.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1580.         else mquant = get_bits(gb, 5);                         \

  1581.       }                                                        \

  1582.     }                                                          \

  1583.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1584.         edges = 1 << v->dqsbedge;                              \

  1585.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1586.         edges = (3 << v->dqsbedge) % 15;                       \

  1587.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1588.         edges = 15;                                            \

  1589.     if((edges&1) && !s->mb_x)                                  \

  1590.         mquant = v->altpq;                                     \

  1591.     if((edges&2) && s->first_slice_line)                       \

  1592.         mquant = v->altpq;                                     \

  1593.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1594.         mquant = v->altpq;                                     \

  1595.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1596.         mquant = v->altpq;                                     \

  1597.   }

  1598. 

  1599. /**

  1600.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1601.  * @brief Get MV differentials

  1602.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1603.  * @param _dmv_x Horizontal differential for decoded MV

  1604.  * @param _dmv_y Vertical differential for decoded MV

  1605.  */

  1606. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1607.   index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table,\

  1608.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1609.   if (index > 36)                                                   \

  1610.   {                                                                 \

  1611.     mb_has_coeffs = 1;                                              \

  1612.     index -= 37;                                                    \

  1613.   }                                                                 \

  1614.   else mb_has_coeffs = 0;                                           \

  1615.   s->mb_intra = 0;                                                  \

  1616.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1617.   else if (index == 35)                                             \

  1618.   {                                                                 \

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

  1620.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1621.   }                                                                 \

  1622.   else if (index == 36)                                             \

  1623.   {                                                                 \

  1624.     _dmv_x = 0;                                                     \

  1625.     _dmv_y = 0;                                                     \

  1626.     s->mb_intra = 1;                                                \

  1627.   }                                                                 \

  1628.   else                                                              \

  1629.   {                                                                 \

  1630.     index1 = index%6;                                               \

  1631.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1632.     else                                   val = 0;                 \

  1633.     if(size_table[index1] - val > 0)                                \

  1634.         val = get_bits(gb, size_table[index1] - val);               \

  1635.     else                                   val = 0;                 \

  1636.     sign = 0 - (val&1);                                             \

  1637.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1638.                                                                     \

  1639.     index1 = index/6;                                               \

  1640.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1641.     else                                   val = 0;                 \

  1642.     if(size_table[index1] - val > 0)                                \

  1643.         val = get_bits(gb, size_table[index1] - val);               \

  1644.     else                                   val = 0;                 \

  1645.     sign = 0 - (val&1);                                             \

  1646.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1647.   }

  1648. 

  1649. /** Predict and set motion vector

  1650.  */

  1651. 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)

  1652. {

  1653.     int xy, wrap, off = 0;

  1654.     int16_t *A, *B, *C;

  1655.     int px, py;

  1656.     int sum;

  1657. 

  1658.     /* scale MV difference to be quad-pel */

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

  1660.     dmv_y <<= 1 - s->quarter_sample;

  1661. 

  1662.     wrap = s->b8_stride;

  1663.     xy = s->block_index[n];

  1664. 

  1665.     if(s->mb_intra){

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

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

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

  1669.         s->current_picture.motion_val[1][xy][1] = 0;

  1670.         if(mv1) { /* duplicate motion data for 1-MV block */

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

  1672.             s->current_picture.motion_val[0][xy + 1][1] = 0;

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

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

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

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

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

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

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

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

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

  1682.             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

  1683.         }

  1684.         return;

  1685.     }

  1686. 

  1687.     C = s->current_picture.motion_val[0][xy - 1];

  1688.     A = s->current_picture.motion_val[0][xy - wrap];

  1689.     if(mv1)

  1690.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1691.     else {

  1692.         //in 4-MV mode different blocks have different B predictor position

  1693.         switch(n){

  1694.         case 0:

  1695.             off = (s->mb_x > 0) ? -1 : 1;

  1696.             break;

  1697.         case 1:

  1698.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1699.             break;

  1700.         case 2:

  1701.             off = 1;

  1702.             break;

  1703.         case 3:

  1704.             off = -1;

  1705.         }

  1706.     }

  1707.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1708. 

  1709.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1710.         if(s->mb_width == 1) {

  1711.             px = A[0];

  1712.             py = A[1];

  1713.         } else {

  1714.             px = mid_pred(A[0], B[0], C[0]);

  1715.             py = mid_pred(A[1], B[1], C[1]);

  1716.         }

  1717.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1718.         px = C[0];

  1719.         py = C[1];

  1720.     } else {

  1721.         px = py = 0;

  1722.     }

  1723.     /* Pullback MV as specified in 8.3.5.3.4 */

  1724.     {

  1725.         int qx, qy, X, Y;

  1726.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1727.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1728.         X = (s->mb_width << 6) - 4;

  1729.         Y = (s->mb_height << 6) - 4;

  1730.         if(mv1) {

  1731.             if(qx + px < -60) px = -60 - qx;

  1732.             if(qy + py < -60) py = -60 - qy;

  1733.         } else {

  1734.             if(qx + px < -28) px = -28 - qx;

  1735.             if(qy + py < -28) py = -28 - qy;

  1736.         }

  1737.         if(qx + px > X) px = X - qx;

  1738.         if(qy + py > Y) py = Y - qy;

  1739.     }

  1740.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1741.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1742.         if(is_intra[xy - wrap])

  1743.             sum = FFABS(px) + FFABS(py);

  1744.         else

  1745.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1746.         if(sum > 32) {

  1747.             if(get_bits1(&s->gb)) {

  1748.                 px = A[0];

  1749.                 py = A[1];

  1750.             } else {

  1751.                 px = C[0];

  1752.                 py = C[1];

  1753.             }

  1754.         } else {

  1755.             if(is_intra[xy - 1])

  1756.                 sum = FFABS(px) + FFABS(py);

  1757.             else

  1758.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1759.             if(sum > 32) {

  1760.                 if(get_bits1(&s->gb)) {

  1761.                     px = A[0];

  1762.                     py = A[1];

  1763.                 } else {

  1764.                     px = C[0];

  1765.                     py = C[1];

  1766.                 }

  1767.             }

  1768.         }

  1769.     }

  1770.     /* store MV using signed modulus of MV range defined in 4.11 */

  1771.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1772.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1773.     if(mv1) { /* duplicate motion data for 1-MV block */

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

  1775.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

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

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

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

  1779.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1780.     }

  1781. }

  1782. 

  1783. /** Motion compensation for direct or interpolated blocks in B-frames

  1784.  */

  1785. static void vc1_interp_mc(VC1Context *v)

  1786. {

  1787.     MpegEncContext *s = &v->s;

  1788.     DSPContext *dsp = &v->s.dsp;

  1789.     uint8_t *srcY, *srcU, *srcV;

  1790.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1791. 

  1792.     if(!v->s.next_picture.data[0])return;

  1793. 

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

  1795.     my = s->mv[1][0][1];

  1796.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1797.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1798.     if(v->fastuvmc) {

  1799.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  1800.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  1801.     }

  1802.     srcY = s->next_picture.data[0];

  1803.     srcU = s->next_picture.data[1];

  1804.     srcV = s->next_picture.data[2];

  1805. 

  1806.     src_x = s->mb_x * 16 + (mx >> 2);

  1807.     src_y = s->mb_y * 16 + (my >> 2);

  1808.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1809.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1810. 

  1811.     if(v->profile != PROFILE_ADVANCED){

  1812.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1813.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1814.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1815.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1816.     }else{

  1817.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1818.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1819.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1820.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1821.     }

  1822. 

  1823.     srcY += src_y * s->linesize + src_x;

  1824.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1825.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1826. 

  1827.     /* for grayscale we should not try to read from unknown area */

  1828.     if(s->flags & CODEC_FLAG_GRAY) {

  1829.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1830.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1831.     }

  1832. 

  1833.     if(v->rangeredfrm

  1834.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1835.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1836.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1837. 

  1838.         srcY -= s->mspel * (1 + s->linesize);

  1839.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  1840.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1841.         srcY = s->edge_emu_buffer;

  1842.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1843.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1844.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1845.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1846.         srcU = uvbuf;

  1847.         srcV = uvbuf + 16;

  1848.         /* if we deal with range reduction we need to scale source blocks */

  1849.         if(v->rangeredfrm) {

  1850.             int i, j;

  1851.             uint8_t *src, *src2;

  1852. 

  1853.             src = srcY;

  1854.             for(j = 0; j < 17 + s->mspel*2; j++) {

  1855.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1856.                 src += s->linesize;

  1857.             }

  1858.             src = srcU; src2 = srcV;

  1859.             for(j = 0; j < 9; j++) {

  1860.                 for(i = 0; i < 9; i++) {

  1861.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1862.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1863.                 }

  1864.                 src += s->uvlinesize;

  1865.                 src2 += s->uvlinesize;

  1866.             }

  1867.         }

  1868.         srcY += s->mspel * (1 + s->linesize);

  1869.     }

  1870. 

  1871.     mx >>= 1;

  1872.     my >>= 1;

  1873.     dxy = ((my & 1) << 1) | (mx & 1);

  1874. 

  1875.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1876. 

  1877.     if(s->flags & CODEC_FLAG_GRAY) return;

  1878.     /* Chroma MC always uses qpel blilinear */

  1879.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1880.     uvmx = (uvmx&3)<<1;

  1881.     uvmy = (uvmy&3)<<1;

  1882.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1883.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1884. }

  1885. 

  1886. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1887. {

  1888.     int n = bfrac;

  1889. 

  1890. #if B_FRACTION_DEN==256

  1891.     if(inv)

  1892.         n -= 256;

  1893.     if(!qs)

  1894.         return 2 * ((value * n + 255) >> 9);

  1895.     return (value * n + 128) >> 8;

  1896. #else

  1897.     if(inv)

  1898.         n -= B_FRACTION_DEN;

  1899.     if(!qs)

  1900.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1901.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1902. #endif

  1903. }

  1904. 

  1905. /** Reconstruct motion vector for B-frame and do motion compensation

  1906.  */

  1907. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1908. {

  1909.     if(v->use_ic) {

  1910.         v->mv_mode2 = v->mv_mode;

  1911.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  1912.     }

  1913.     if(direct) {

  1914.         vc1_mc_1mv(v, 0);

  1915.         vc1_interp_mc(v);

  1916.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1917.         return;

  1918.     }

  1919.     if(mode == BMV_TYPE_INTERPOLATED) {

  1920.         vc1_mc_1mv(v, 0);

  1921.         vc1_interp_mc(v);

  1922.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1923.         return;

  1924.     }

  1925. 

  1926.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  1927.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  1928.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  1929. }

  1930. 

  1931. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  1932. {

  1933.     MpegEncContext *s = &v->s;

  1934.     int xy, wrap, off = 0;

  1935.     int16_t *A, *B, *C;

  1936.     int px, py;

  1937.     int sum;

  1938.     int r_x, r_y;

  1939.     const uint8_t *is_intra = v->mb_type[0];

  1940. 

  1941.     r_x = v->range_x;

  1942.     r_y = v->range_y;

  1943.     /* scale MV difference to be quad-pel */

  1944.     dmv_x[0] <<= 1 - s->quarter_sample;

  1945.     dmv_y[0] <<= 1 - s->quarter_sample;

  1946.     dmv_x[1] <<= 1 - s->quarter_sample;

  1947.     dmv_y[1] <<= 1 - s->quarter_sample;

  1948. 

  1949.     wrap = s->b8_stride;

  1950.     xy = s->block_index[0];

  1951. 

  1952.     if(s->mb_intra) {

  1953.         s->current_picture.motion_val[0][xy][0] =

  1954.         s->current_picture.motion_val[0][xy][1] =

  1955.         s->current_picture.motion_val[1][xy][0] =

  1956.         s->current_picture.motion_val[1][xy][1] = 0;

  1957.         return;

  1958.     }

  1959.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  1960.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  1961.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  1962.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  1963. 

  1964.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  1965.     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));

  1966.     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));

  1967.     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));

  1968.     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));

  1969.     if(direct) {

  1970.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  1971.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  1972.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  1973.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  1974.         return;

  1975.     }

  1976. 

  1977.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  1978.         C = s->current_picture.motion_val[0][xy - 2];

  1979.         A = s->current_picture.motion_val[0][xy - wrap*2];

  1980.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1981.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  1982. 

  1983.         if(!s->mb_x) C[0] = C[1] = 0;

  1984.         if(!s->first_slice_line) { // predictor A is not out of bounds

  1985.             if(s->mb_width == 1) {

  1986.                 px = A[0];

  1987.                 py = A[1];

  1988.             } else {

  1989.                 px = mid_pred(A[0], B[0], C[0]);

  1990.                 py = mid_pred(A[1], B[1], C[1]);

  1991.             }

  1992.         } else if(s->mb_x) { // predictor C is not out of bounds

  1993.             px = C[0];

  1994.             py = C[1];

  1995.         } else {

  1996.             px = py = 0;

  1997.         }

  1998.         /* Pullback MV as specified in 8.3.5.3.4 */

  1999.         {

  2000.             int qx, qy, X, Y;

  2001.             if(v->profile < PROFILE_ADVANCED) {

  2002.                 qx = (s->mb_x << 5);

  2003.                 qy = (s->mb_y << 5);

  2004.                 X = (s->mb_width << 5) - 4;

  2005.                 Y = (s->mb_height << 5) - 4;

  2006.                 if(qx + px < -28) px = -28 - qx;

  2007.                 if(qy + py < -28) py = -28 - qy;

  2008.                 if(qx + px > X) px = X - qx;

  2009.                 if(qy + py > Y) py = Y - qy;

  2010.             } else {

  2011.                 qx = (s->mb_x << 6);

  2012.                 qy = (s->mb_y << 6);

  2013.                 X = (s->mb_width << 6) - 4;

  2014.                 Y = (s->mb_height << 6) - 4;

  2015.                 if(qx + px < -60) px = -60 - qx;

  2016.                 if(qy + py < -60) py = -60 - qy;

  2017.                 if(qx + px > X) px = X - qx;

  2018.                 if(qy + py > Y) py = Y - qy;

  2019.             }

  2020.         }

  2021.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2022.         if(0 && !s->first_slice_line && s->mb_x) {

  2023.             if(is_intra[xy - wrap])

  2024.                 sum = FFABS(px) + FFABS(py);

  2025.             else

  2026.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2027.             if(sum > 32) {

  2028.                 if(get_bits1(&s->gb)) {

  2029.                     px = A[0];

  2030.                     py = A[1];

  2031.                 } else {

  2032.                     px = C[0];

  2033.                     py = C[1];

  2034.                 }

  2035.             } else {

  2036.                 if(is_intra[xy - 2])

  2037.                     sum = FFABS(px) + FFABS(py);

  2038.                 else

  2039.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2040.                 if(sum > 32) {

  2041.                     if(get_bits1(&s->gb)) {

  2042.                         px = A[0];

  2043.                         py = A[1];

  2044.                     } else {

  2045.                         px = C[0];

  2046.                         py = C[1];

  2047.                     }

  2048.                 }

  2049.             }

  2050.         }

  2051.         /* store MV using signed modulus of MV range defined in 4.11 */

  2052.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2053.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2054.     }

  2055.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2056.         C = s->current_picture.motion_val[1][xy - 2];

  2057.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2058.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2059.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2060. 

  2061.         if(!s->mb_x) C[0] = C[1] = 0;

  2062.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2063.             if(s->mb_width == 1) {

  2064.                 px = A[0];

  2065.                 py = A[1];

  2066.             } else {

  2067.                 px = mid_pred(A[0], B[0], C[0]);

  2068.                 py = mid_pred(A[1], B[1], C[1]);

  2069.             }

  2070.         } else if(s->mb_x) { // predictor C is not out of bounds

  2071.             px = C[0];

  2072.             py = C[1];

  2073.         } else {

  2074.             px = py = 0;

  2075.         }

  2076.         /* Pullback MV as specified in 8.3.5.3.4 */

  2077.         {

  2078.             int qx, qy, X, Y;

  2079.             if(v->profile < PROFILE_ADVANCED) {

  2080.                 qx = (s->mb_x << 5);

  2081.                 qy = (s->mb_y << 5);

  2082.                 X = (s->mb_width << 5) - 4;

  2083.                 Y = (s->mb_height << 5) - 4;

  2084.                 if(qx + px < -28) px = -28 - qx;

  2085.                 if(qy + py < -28) py = -28 - qy;

  2086.                 if(qx + px > X) px = X - qx;

  2087.                 if(qy + py > Y) py = Y - qy;

  2088.             } else {

  2089.                 qx = (s->mb_x << 6);

  2090.                 qy = (s->mb_y << 6);

  2091.                 X = (s->mb_width << 6) - 4;

  2092.                 Y = (s->mb_height << 6) - 4;

  2093.                 if(qx + px < -60) px = -60 - qx;

  2094.                 if(qy + py < -60) py = -60 - qy;

  2095.                 if(qx + px > X) px = X - qx;

  2096.                 if(qy + py > Y) py = Y - qy;

  2097.             }

  2098.         }

  2099.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2100.         if(0 && !s->first_slice_line && s->mb_x) {

  2101.             if(is_intra[xy - wrap])

  2102.                 sum = FFABS(px) + FFABS(py);

  2103.             else

  2104.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2105.             if(sum > 32) {

  2106.                 if(get_bits1(&s->gb)) {

  2107.                     px = A[0];

  2108.                     py = A[1];

  2109.                 } else {

  2110.                     px = C[0];

  2111.                     py = C[1];

  2112.                 }

  2113.             } else {

  2114.                 if(is_intra[xy - 2])

  2115.                     sum = FFABS(px) + FFABS(py);

  2116.                 else

  2117.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2118.                 if(sum > 32) {

  2119.                     if(get_bits1(&s->gb)) {

  2120.                         px = A[0];

  2121.                         py = A[1];

  2122.                     } else {

  2123.                         px = C[0];

  2124.                         py = C[1];

  2125.                     }

  2126.                 }

  2127.             }

  2128.         }

  2129.         /* store MV using signed modulus of MV range defined in 4.11 */

  2130. 

  2131.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2132.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2133.     }

  2134.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2135.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2136.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2137.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2138. }

  2139. 

  2140. /** Get predicted DC value for I-frames only

  2141.  * prediction dir: left=0, top=1

  2142.  * @param s MpegEncContext

  2143.  * @param[in] n block index in the current MB

  2144.  * @param dc_val_ptr Pointer to DC predictor

  2145.  * @param dir_ptr Prediction direction for use in AC prediction

  2146.  */

  2147. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2148.                               int16_t **dc_val_ptr, int *dir_ptr)

  2149. {

  2150.     int a, b, c, wrap, pred, scale;

  2151.     int16_t *dc_val;

  2152.     static const uint16_t dcpred[32] = {

  2153.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2154.          114,  102,   93,   85,   79,   73,   68,   64,

  2155.           60,   57,   54,   51,   49,   47,   45,   43,

  2156.           41,   39,   38,   37,   35,   34,   33

  2157.     };

  2158. 

  2159.     /* find prediction - wmv3_dc_scale always used here in fact */

  2160.     if (n < 4)     scale = s->y_dc_scale;

  2161.     else           scale = s->c_dc_scale;

  2162. 

  2163.     wrap = s->block_wrap[n];

  2164.     dc_val= s->dc_val[0] + s->block_index[n];

  2165. 

  2166.     /* B A

  2167.      * C X

  2168.      */

  2169.     c = dc_val[ - 1];

  2170.     b = dc_val[ - 1 - wrap];

  2171.     a = dc_val[ - wrap];

  2172. 

  2173.     if (pq < 9 || !overlap)

  2174.     {

  2175.         /* Set outer values */

  2176.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2177.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2178.     }

  2179.     else

  2180.     {

  2181.         /* Set outer values */

  2182.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2183.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2184.     }

  2185. 

  2186.     if (abs(a - b) <= abs(b - c)) {

  2187.         pred = c;

  2188.         *dir_ptr = 1;//left

  2189.     } else {

  2190.         pred = a;

  2191.         *dir_ptr = 0;//top

  2192.     }

  2193. 

  2194.     /* update predictor */

  2195.     *dc_val_ptr = &dc_val[0];

  2196.     return pred;

  2197. }

  2198. 

  2199. 

  2200. /** Get predicted DC value

  2201.  * prediction dir: left=0, top=1

  2202.  * @param s MpegEncContext

  2203.  * @param[in] n block index in the current MB

  2204.  * @param dc_val_ptr Pointer to DC predictor

  2205.  * @param dir_ptr Prediction direction for use in AC prediction

  2206.  */

  2207. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2208.                               int a_avail, int c_avail,

  2209.                               int16_t **dc_val_ptr, int *dir_ptr)

  2210. {

  2211.     int a, b, c, wrap, pred, scale;

  2212.     int16_t *dc_val;

  2213.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2214.     int q1, q2 = 0;

  2215. 

  2216.     /* find prediction - wmv3_dc_scale always used here in fact */

  2217.     if (n < 4)     scale = s->y_dc_scale;

  2218.     else           scale = s->c_dc_scale;

  2219. 

  2220.     wrap = s->block_wrap[n];

  2221.     dc_val= s->dc_val[0] + s->block_index[n];

  2222. 

  2223.     /* B A

  2224.      * C X

  2225.      */

  2226.     c = dc_val[ - 1];

  2227.     b = dc_val[ - 1 - wrap];

  2228.     a = dc_val[ - wrap];

  2229.     /* scale predictors if needed */

  2230.     q1 = s->current_picture.qscale_table[mb_pos];

  2231.     if(c_avail && (n!= 1 && n!=3)) {

  2232.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2233.         if(q2 && q2 != q1)

  2234.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2235.     }

  2236.     if(a_avail && (n!= 2 && n!=3)) {

  2237.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2238.         if(q2 && q2 != q1)

  2239.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2240.     }

  2241.     if(a_avail && c_avail && (n!=3)) {

  2242.         int off = mb_pos;

  2243.         if(n != 1) off--;

  2244.         if(n != 2) off -= s->mb_stride;

  2245.         q2 = s->current_picture.qscale_table[off];

  2246.         if(q2 && q2 != q1)

  2247.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2248.     }

  2249. 

  2250.     if(a_avail && c_avail) {

  2251.         if(abs(a - b) <= abs(b - c)) {

  2252.             pred = c;

  2253.             *dir_ptr = 1;//left

  2254.         } else {

  2255.             pred = a;

  2256.             *dir_ptr = 0;//top

  2257.         }

  2258.     } else if(a_avail) {

  2259.         pred = a;

  2260.         *dir_ptr = 0;//top

  2261.     } else if(c_avail) {

  2262.         pred = c;

  2263.         *dir_ptr = 1;//left

  2264.     } else {

  2265.         pred = 0;

  2266.         *dir_ptr = 1;//left

  2267.     }

  2268. 

  2269.     /* update predictor */

  2270.     *dc_val_ptr = &dc_val[0];

  2271.     return pred;

  2272. }

  2273. 

  2274. 

  2275. /**

  2276.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2277.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2278.  * @{

  2279.  */

  2280. 

  2281. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2282. {

  2283.     int xy, wrap, pred, a, b, c;

  2284. 

  2285.     xy = s->block_index[n];

  2286.     wrap = s->b8_stride;

  2287. 

  2288.     /* B C

  2289.      * A X

  2290.      */

  2291.     a = s->coded_block[xy - 1       ];

  2292.     b = s->coded_block[xy - 1 - wrap];

  2293.     c = s->coded_block[xy     - wrap];

  2294. 

  2295.     if (b == c) {

  2296.         pred = a;

  2297.     } else {

  2298.         pred = c;

  2299.     }

  2300. 

  2301.     /* store value */

  2302.     *coded_block_ptr = &s->coded_block[xy];

  2303. 

  2304.     return pred;

  2305. }

  2306. 

  2307. /**

  2308.  * Decode one AC coefficient

  2309.  * @param v The VC1 context

  2310.  * @param last Last coefficient

  2311.  * @param skip How much zero coefficients to skip

  2312.  * @param value Decoded AC coefficient value

  2313.  * @see 8.1.3.4

  2314.  */

  2315. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2316. {

  2317.     GetBitContext *gb = &v->s.gb;

  2318.     int index, escape, run = 0, level = 0, lst = 0;

  2319. 

  2320.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2321.     if (index != vc1_ac_sizes[codingset] - 1) {

  2322.         run = vc1_index_decode_table[codingset][index][0];

  2323.         level = vc1_index_decode_table[codingset][index][1];

  2324.         lst = index >= vc1_last_decode_table[codingset];

  2325.         if(get_bits(gb, 1))

  2326.             level = -level;

  2327.     } else {

  2328.         escape = decode210(gb);

  2329.         if (escape != 2) {

  2330.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2331.             run = vc1_index_decode_table[codingset][index][0];

  2332.             level = vc1_index_decode_table[codingset][index][1];

  2333.             lst = index >= vc1_last_decode_table[codingset];

  2334.             if(escape == 0) {

  2335.                 if(lst)

  2336.                     level += vc1_last_delta_level_table[codingset][run];

  2337.                 else

  2338.                     level += vc1_delta_level_table[codingset][run];

  2339.             } else {

  2340.                 if(lst)

  2341.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2342.                 else

  2343.                     run += vc1_delta_run_table[codingset][level] + 1;

  2344.             }

  2345.             if(get_bits(gb, 1))

  2346.                 level = -level;

  2347.         } else {

  2348.             int sign;

  2349.             lst = get_bits(gb, 1);

  2350.             if(v->s.esc3_level_length == 0) {

  2351.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2352.                     v->s.esc3_level_length = get_bits(gb, 3);

  2353.                     if(!v->s.esc3_level_length)

  2354.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2355.                 } else { //table 60

  2356.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2357.                 }

  2358.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2359.             }

  2360.             run = get_bits(gb, v->s.esc3_run_length);

  2361.             sign = get_bits(gb, 1);

  2362.             level = get_bits(gb, v->s.esc3_level_length);

  2363.             if(sign)

  2364.                 level = -level;

  2365.         }

  2366.     }

  2367. 

  2368.     *last = lst;

  2369.     *skip = run;

  2370.     *value = level;

  2371. }

  2372. 

  2373. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2374.  * @param v VC1Context

  2375.  * @param block block to decode

  2376.  * @param coded are AC coeffs present or not

  2377.  * @param codingset set of VLC to decode data

  2378.  */

  2379. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2380. {

  2381.     GetBitContext *gb = &v->s.gb;

  2382.     MpegEncContext *s = &v->s;

  2383.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2384.     int run_diff, i;

  2385.     int16_t *dc_val;

  2386.     int16_t *ac_val, *ac_val2;

  2387.     int dcdiff;

  2388. 

  2389.     /* Get DC differential */

  2390.     if (n < 4) {

  2391.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2392.     } else {

  2393.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2394.     }

  2395.     if (dcdiff < 0){

  2396.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2397.         return -1;

  2398.     }

  2399.     if (dcdiff)

  2400.     {

  2401.         if (dcdiff == 119 /* ESC index value */)

  2402.         {

  2403.             /* TODO: Optimize */

  2404.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2405.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2406.             else dcdiff = get_bits(gb, 8);

  2407.         }

  2408.         else

  2409.         {

  2410.             if (v->pq == 1)

  2411.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2412.             else if (v->pq == 2)

  2413.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2414.         }

  2415.         if (get_bits(gb, 1))

  2416.             dcdiff = -dcdiff;

  2417.     }

  2418. 

  2419.     /* Prediction */

  2420.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2421.     *dc_val = dcdiff;

  2422. 

  2423.     /* Store the quantized DC coeff, used for prediction */

  2424.     if (n < 4) {

  2425.         block[0] = dcdiff * s->y_dc_scale;

  2426.     } else {

  2427.         block[0] = dcdiff * s->c_dc_scale;

  2428.     }

  2429.     /* Skip ? */

  2430.     run_diff = 0;

  2431.     i = 0;

  2432.     if (!coded) {

  2433.         goto not_coded;

  2434.     }

  2435. 

  2436.     //AC Decoding

  2437.     i = 1;

  2438. 

  2439.     {

  2440.         int last = 0, skip, value;

  2441.         const int8_t *zz_table;

  2442.         int scale;

  2443.         int k;

  2444. 

  2445.         scale = v->pq * 2 + v->halfpq;

  2446. 

  2447.         if(v->s.ac_pred) {

  2448.             if(!dc_pred_dir)

  2449.                 zz_table = ff_vc1_horizontal_zz;

  2450.             else

  2451.                 zz_table = ff_vc1_vertical_zz;

  2452.         } else

  2453.             zz_table = ff_vc1_normal_zz;

  2454. 

  2455.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2456.         ac_val2 = ac_val;

  2457.         if(dc_pred_dir) //left

  2458.             ac_val -= 16;

  2459.         else //top

  2460.             ac_val -= 16 * s->block_wrap[n];

  2461. 

  2462.         while (!last) {

  2463.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2464.             i += skip;

  2465.             if(i > 63)

  2466.                 break;

  2467.             block[zz_table[i++]] = value;

  2468.         }

  2469. 

  2470.         /* apply AC prediction if needed */

  2471.         if(s->ac_pred) {

  2472.             if(dc_pred_dir) { //left

  2473.                 for(k = 1; k < 8; k++)

  2474.                     block[k << 3] += ac_val[k];

  2475.             } else { //top

  2476.                 for(k = 1; k < 8; k++)

  2477.                     block[k] += ac_val[k + 8];

  2478.             }

  2479.         }

  2480.         /* save AC coeffs for further prediction */

  2481.         for(k = 1; k < 8; k++) {

  2482.             ac_val2[k] = block[k << 3];

  2483.             ac_val2[k + 8] = block[k];

  2484.         }

  2485. 

  2486.         /* scale AC coeffs */

  2487.         for(k = 1; k < 64; k++)

  2488.             if(block[k]) {

  2489.                 block[k] *= scale;

  2490.                 if(!v->pquantizer)

  2491.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2492.             }

  2493. 

  2494.         if(s->ac_pred) i = 63;

  2495.     }

  2496. 

  2497. not_coded:

  2498.     if(!coded) {

  2499.         int k, scale;

  2500.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2501.         ac_val2 = ac_val;

  2502. 

  2503.         scale = v->pq * 2 + v->halfpq;

  2504.         memset(ac_val2, 0, 16 * 2);

  2505.         if(dc_pred_dir) {//left

  2506.             ac_val -= 16;

  2507.             if(s->ac_pred)

  2508.                 memcpy(ac_val2, ac_val, 8 * 2);

  2509.         } else {//top

  2510.             ac_val -= 16 * s->block_wrap[n];

  2511.             if(s->ac_pred)

  2512.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2513.         }

  2514. 

  2515.         /* apply AC prediction if needed */

  2516.         if(s->ac_pred) {

  2517.             if(dc_pred_dir) { //left

  2518.                 for(k = 1; k < 8; k++) {

  2519.                     block[k << 3] = ac_val[k] * scale;

  2520.                     if(!v->pquantizer && block[k << 3])

  2521.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2522.                 }

  2523.             } else { //top

  2524.                 for(k = 1; k < 8; k++) {

  2525.                     block[k] = ac_val[k + 8] * scale;

  2526.                     if(!v->pquantizer && block[k])

  2527.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2528.                 }

  2529.             }

  2530.             i = 63;

  2531.         }

  2532.     }

  2533.     s->block_last_index[n] = i;

  2534. 

  2535.     return 0;

  2536. }

  2537. 

  2538. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2539.  * @param v VC1Context

  2540.  * @param block block to decode

  2541.  * @param coded are AC coeffs present or not

  2542.  * @param codingset set of VLC to decode data

  2543.  */

  2544. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2545. {

  2546.     GetBitContext *gb = &v->s.gb;

  2547.     MpegEncContext *s = &v->s;

  2548.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2549.     int run_diff, i;

  2550.     int16_t *dc_val;

  2551.     int16_t *ac_val, *ac_val2;

  2552.     int dcdiff;

  2553.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2554.     int use_pred = s->ac_pred;

  2555.     int scale;

  2556.     int q1, q2 = 0;

  2557.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2558. 

  2559.     /* Get DC differential */

  2560.     if (n < 4) {

  2561.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2562.     } else {

  2563.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2564.     }

  2565.     if (dcdiff < 0){

  2566.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2567.         return -1;

  2568.     }

  2569.     if (dcdiff)

  2570.     {

  2571.         if (dcdiff == 119 /* ESC index value */)

  2572.         {

  2573.             /* TODO: Optimize */

  2574.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2575.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2576.             else dcdiff = get_bits(gb, 8);

  2577.         }

  2578.         else

  2579.         {

  2580.             if (mquant == 1)

  2581.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2582.             else if (mquant == 2)

  2583.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2584.         }

  2585.         if (get_bits(gb, 1))

  2586.             dcdiff = -dcdiff;

  2587.     }

  2588. 

  2589.     /* Prediction */

  2590.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2591.     *dc_val = dcdiff;

  2592. 

  2593.     /* Store the quantized DC coeff, used for prediction */

  2594.     if (n < 4) {

  2595.         block[0] = dcdiff * s->y_dc_scale;

  2596.     } else {

  2597.         block[0] = dcdiff * s->c_dc_scale;

  2598.     }

  2599.     /* Skip ? */

  2600.     run_diff = 0;

  2601.     i = 0;

  2602. 

  2603.     //AC Decoding

  2604.     i = 1;

  2605. 

  2606.     /* check if AC is needed at all */

  2607.     if(!a_avail && !c_avail) use_pred = 0;

  2608.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2609.     ac_val2 = ac_val;

  2610. 

  2611.     scale = mquant * 2 + v->halfpq;

  2612. 

  2613.     if(dc_pred_dir) //left

  2614.         ac_val -= 16;

  2615.     else //top

  2616.         ac_val -= 16 * s->block_wrap[n];

  2617. 

  2618.     q1 = s->current_picture.qscale_table[mb_pos];

  2619.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2620.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2621.     if(dc_pred_dir && n==1) q2 = q1;

  2622.     if(!dc_pred_dir && n==2) q2 = q1;

  2623.     if(n==3) q2 = q1;

  2624. 

  2625.     if(coded) {

  2626.         int last = 0, skip, value;

  2627.         const int8_t *zz_table;

  2628.         int k;

  2629. 

  2630.         if(v->s.ac_pred) {

  2631.             if(!dc_pred_dir)

  2632.                 zz_table = ff_vc1_horizontal_zz;

  2633.             else

  2634.                 zz_table = ff_vc1_vertical_zz;

  2635.         } else

  2636.             zz_table = ff_vc1_normal_zz;

  2637. 

  2638.         while (!last) {

  2639.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2640.             i += skip;

  2641.             if(i > 63)

  2642.                 break;

  2643.             block[zz_table[i++]] = value;

  2644.         }

  2645. 

  2646.         /* apply AC prediction if needed */

  2647.         if(use_pred) {

  2648.             /* scale predictors if needed*/

  2649.             if(q2 && q1!=q2) {

  2650.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2651.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2652. 

  2653.                 if(dc_pred_dir) { //left

  2654.                     for(k = 1; k < 8; k++)

  2655.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2656.                 } else { //top

  2657.                     for(k = 1; k < 8; k++)

  2658.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2659.                 }

  2660.             } else {

  2661.                 if(dc_pred_dir) { //left

  2662.                     for(k = 1; k < 8; k++)

  2663.                         block[k << 3] += ac_val[k];

  2664.                 } else { //top

  2665.                     for(k = 1; k < 8; k++)

  2666.                         block[k] += ac_val[k + 8];

  2667.                 }

  2668.             }

  2669.         }

  2670.         /* save AC coeffs for further prediction */

  2671.         for(k = 1; k < 8; k++) {

  2672.             ac_val2[k] = block[k << 3];

  2673.             ac_val2[k + 8] = block[k];

  2674.         }

  2675. 

  2676.         /* scale AC coeffs */

  2677.         for(k = 1; k < 64; k++)

  2678.             if(block[k]) {

  2679.                 block[k] *= scale;

  2680.                 if(!v->pquantizer)

  2681.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2682.             }

  2683. 

  2684.         if(use_pred) i = 63;

  2685.     } else { // no AC coeffs

  2686.         int k;

  2687. 

  2688.         memset(ac_val2, 0, 16 * 2);

  2689.         if(dc_pred_dir) {//left

  2690.             if(use_pred) {

  2691.                 memcpy(ac_val2, ac_val, 8 * 2);

  2692.                 if(q2 && q1!=q2) {

  2693.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2694.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2695.                     for(k = 1; k < 8; k++)

  2696.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2697.                 }

  2698.             }

  2699.         } else {//top

  2700.             if(use_pred) {

  2701.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2702.                 if(q2 && q1!=q2) {

  2703.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2704.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2705.                     for(k = 1; k < 8; k++)

  2706.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2707.                 }

  2708.             }

  2709.         }

  2710. 

  2711.         /* apply AC prediction if needed */

  2712.         if(use_pred) {

  2713.             if(dc_pred_dir) { //left

  2714.                 for(k = 1; k < 8; k++) {

  2715.                     block[k << 3] = ac_val2[k] * scale;

  2716.                     if(!v->pquantizer && block[k << 3])

  2717.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2718.                 }

  2719.             } else { //top

  2720.                 for(k = 1; k < 8; k++) {

  2721.                     block[k] = ac_val2[k + 8] * scale;

  2722.                     if(!v->pquantizer && block[k])

  2723.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2724.                 }

  2725.             }

  2726.             i = 63;

  2727.         }

  2728.     }

  2729.     s->block_last_index[n] = i;

  2730. 

  2731.     return 0;

  2732. }

  2733. 

  2734. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2735.  * @param v VC1Context

  2736.  * @param block block to decode

  2737.  * @param coded are AC coeffs present or not

  2738.  * @param mquant block quantizer

  2739.  * @param codingset set of VLC to decode data

  2740.  */

  2741. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2742. {

  2743.     GetBitContext *gb = &v->s.gb;

  2744.     MpegEncContext *s = &v->s;

  2745.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2746.     int run_diff, i;

  2747.     int16_t *dc_val;

  2748.     int16_t *ac_val, *ac_val2;

  2749.     int dcdiff;

  2750.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2751.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2752.     int use_pred = s->ac_pred;

  2753.     int scale;

  2754.     int q1, q2 = 0;

  2755. 

  2756.     /* XXX: Guard against dumb values of mquant */

  2757.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2758. 

  2759.     /* Set DC scale - y and c use the same */

  2760.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2761.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2762. 

  2763.     /* Get DC differential */

  2764.     if (n < 4) {

  2765.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2766.     } else {

  2767.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2768.     }

  2769.     if (dcdiff < 0){

  2770.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2771.         return -1;

  2772.     }

  2773.     if (dcdiff)

  2774.     {

  2775.         if (dcdiff == 119 /* ESC index value */)

  2776.         {

  2777.             /* TODO: Optimize */

  2778.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2779.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2780.             else dcdiff = get_bits(gb, 8);

  2781.         }

  2782.         else

  2783.         {

  2784.             if (mquant == 1)

  2785.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2786.             else if (mquant == 2)

  2787.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2788.         }

  2789.         if (get_bits(gb, 1))

  2790.             dcdiff = -dcdiff;

  2791.     }

  2792. 

  2793.     /* Prediction */

  2794.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2795.     *dc_val = dcdiff;

  2796. 

  2797.     /* Store the quantized DC coeff, used for prediction */

  2798. 

  2799.     if (n < 4) {

  2800.         block[0] = dcdiff * s->y_dc_scale;

  2801.     } else {

  2802.         block[0] = dcdiff * s->c_dc_scale;

  2803.     }

  2804.     /* Skip ? */

  2805.     run_diff = 0;

  2806.     i = 0;

  2807. 

  2808.     //AC Decoding

  2809.     i = 1;

  2810. 

  2811.     /* check if AC is needed at all and adjust direction if needed */

  2812.     if(!a_avail) dc_pred_dir = 1;

  2813.     if(!c_avail) dc_pred_dir = 0;

  2814.     if(!a_avail && !c_avail) use_pred = 0;

  2815.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2816.     ac_val2 = ac_val;

  2817. 

  2818.     scale = mquant * 2 + v->halfpq;

  2819. 

  2820.     if(dc_pred_dir) //left

  2821.         ac_val -= 16;

  2822.     else //top

  2823.         ac_val -= 16 * s->block_wrap[n];

  2824. 

  2825.     q1 = s->current_picture.qscale_table[mb_pos];

  2826.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2827.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2828.     if(dc_pred_dir && n==1) q2 = q1;

  2829.     if(!dc_pred_dir && n==2) q2 = q1;

  2830.     if(n==3) q2 = q1;

  2831. 

  2832.     if(coded) {

  2833.         int last = 0, skip, value;

  2834.         const int8_t *zz_table;

  2835.         int k;

  2836. 

  2837.         zz_table = ff_vc1_simple_progressive_8x8_zz;

  2838. 

  2839.         while (!last) {

  2840.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2841.             i += skip;

  2842.             if(i > 63)

  2843.                 break;

  2844.             block[zz_table[i++]] = value;

  2845.         }

  2846. 

  2847.         /* apply AC prediction if needed */

  2848.         if(use_pred) {

  2849.             /* scale predictors if needed*/

  2850.             if(q2 && q1!=q2) {

  2851.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2852.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2853. 

  2854.                 if(dc_pred_dir) { //left

  2855.                     for(k = 1; k < 8; k++)

  2856.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2857.                 } else { //top

  2858.                     for(k = 1; k < 8; k++)

  2859.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2860.                 }

  2861.             } else {

  2862.                 if(dc_pred_dir) { //left

  2863.                     for(k = 1; k < 8; k++)

  2864.                         block[k << 3] += ac_val[k];

  2865.                 } else { //top

  2866.                     for(k = 1; k < 8; k++)

  2867.                         block[k] += ac_val[k + 8];

  2868.                 }

  2869.             }

  2870.         }

  2871.         /* save AC coeffs for further prediction */

  2872.         for(k = 1; k < 8; k++) {

  2873.             ac_val2[k] = block[k << 3];

  2874.             ac_val2[k + 8] = block[k];

  2875.         }

  2876. 

  2877.         /* scale AC coeffs */

  2878.         for(k = 1; k < 64; k++)

  2879.             if(block[k]) {

  2880.                 block[k] *= scale;

  2881.                 if(!v->pquantizer)

  2882.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2883.             }

  2884. 

  2885.         if(use_pred) i = 63;

  2886.     } else { // no AC coeffs

  2887.         int k;

  2888. 

  2889.         memset(ac_val2, 0, 16 * 2);

  2890.         if(dc_pred_dir) {//left

  2891.             if(use_pred) {

  2892.                 memcpy(ac_val2, ac_val, 8 * 2);

  2893.                 if(q2 && q1!=q2) {

  2894.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2895.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2896.                     for(k = 1; k < 8; k++)

  2897.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2898.                 }

  2899.             }

  2900.         } else {//top

  2901.             if(use_pred) {

  2902.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2903.                 if(q2 && q1!=q2) {

  2904.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2905.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2906.                     for(k = 1; k < 8; k++)

  2907.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2908.                 }

  2909.             }

  2910.         }

  2911. 

  2912.         /* apply AC prediction if needed */

  2913.         if(use_pred) {

  2914.             if(dc_pred_dir) { //left

  2915.                 for(k = 1; k < 8; k++) {

  2916.                     block[k << 3] = ac_val2[k] * scale;

  2917.                     if(!v->pquantizer && block[k << 3])

  2918.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2919.                 }

  2920.             } else { //top

  2921.                 for(k = 1; k < 8; k++) {

  2922.                     block[k] = ac_val2[k + 8] * scale;

  2923.                     if(!v->pquantizer && block[k])

  2924.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2925.                 }

  2926.             }

  2927.             i = 63;

  2928.         }

  2929.     }

  2930.     s->block_last_index[n] = i;

  2931. 

  2932.     return 0;

  2933. }

  2934. 

  2935. /** Decode P block

  2936.  */

  2937. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2938. {

  2939.     MpegEncContext *s = &v->s;

  2940.     GetBitContext *gb = &s->gb;

  2941.     int i, j;

  2942.     int subblkpat = 0;

  2943.     int scale, off, idx, last, skip, value;

  2944.     int ttblk = ttmb & 7;

  2945. 

  2946.     if(ttmb == -1) {

  2947.         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)];

  2948.     }

  2949.     if(ttblk == TT_4X4) {

  2950.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2951.     }

  2952.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2953.         subblkpat = decode012(gb);

  2954.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2955.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2956.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2957.     }

  2958.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  2959. 

  2960.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2961.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2962.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2963.         ttblk = TT_8X4;

  2964.     }

  2965.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2966.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2967.         ttblk = TT_4X8;

  2968.     }

  2969.     switch(ttblk) {

  2970.     case TT_8X8:

  2971.         i = 0;

  2972.         last = 0;

  2973.         while (!last) {

  2974.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2975.             i += skip;

  2976.             if(i > 63)

  2977.                 break;

  2978.             idx = ff_vc1_simple_progressive_8x8_zz[i++];

  2979.             block[idx] = value * scale;

  2980.             if(!v->pquantizer)

  2981.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2982.         }

  2983.         s->dsp.vc1_inv_trans_8x8(block);

  2984.         break;

  2985.     case TT_4X4:

  2986.         for(j = 0; j < 4; j++) {

  2987.             last = subblkpat & (1 << (3 - j));

  2988.             i = 0;

  2989.             off = (j & 1) * 4 + (j & 2) * 16;

  2990.             while (!last) {

  2991.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2992.                 i += skip;

  2993.                 if(i > 15)

  2994.                     break;

  2995.                 idx = ff_vc1_simple_progressive_4x4_zz[i++];

  2996.                 block[idx + off] = value * scale;

  2997.                 if(!v->pquantizer)

  2998.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2999.             }

  3000.             if(!(subblkpat & (1 << (3 - j))))

  3001.                 s->dsp.vc1_inv_trans_4x4(block, j);

  3002.         }

  3003.         break;

  3004.     case TT_8X4:

  3005.         for(j = 0; j < 2; j++) {

  3006.             last = subblkpat & (1 << (1 - j));

  3007.             i = 0;

  3008.             off = j * 32;

  3009.             while (!last) {

  3010.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3011.                 i += skip;

  3012.                 if(i > 31)

  3013.                     break;

  3014.                 if(v->profile < PROFILE_ADVANCED)

  3015.                     idx = ff_vc1_simple_progressive_8x4_zz[i++];

  3016.                 else

  3017.                     idx = ff_vc1_adv_progressive_8x4_zz[i++];

  3018.                 block[idx + off] = value * scale;

  3019.                 if(!v->pquantizer)

  3020.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3021.             }

  3022.             if(!(subblkpat & (1 << (1 - j))))

  3023.                 s->dsp.vc1_inv_trans_8x4(block, j);

  3024.         }

  3025.         break;

  3026.     case TT_4X8:

  3027.         for(j = 0; j < 2; j++) {

  3028.             last = subblkpat & (1 << (1 - j));

  3029.             i = 0;

  3030.             off = j * 4;

  3031.             while (!last) {

  3032.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3033.                 i += skip;

  3034.                 if(i > 31)

  3035.                     break;

  3036.                 if(v->profile < PROFILE_ADVANCED)

  3037.                     idx = ff_vc1_simple_progressive_4x8_zz[i++];

  3038.                 else

  3039.                     idx = ff_vc1_adv_progressive_4x8_zz[i++];

  3040.                 block[idx + off] = value * scale;

  3041.                 if(!v->pquantizer)

  3042.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3043.             }

  3044.             if(!(subblkpat & (1 << (1 - j))))

  3045.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3046.         }

  3047.         break;

  3048.     }

  3049.     return 0;

  3050. }

  3051. 

  3052. 

  3053. /** Decode one P-frame MB (in Simple/Main profile)

  3054.  */

  3055. static int vc1_decode_p_mb(VC1Context *v)

  3056. {

  3057.     MpegEncContext *s = &v->s;

  3058.     GetBitContext *gb = &s->gb;

  3059.     int i, j;

  3060.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3061.     int cbp; /* cbp decoding stuff */

  3062.     int mqdiff, mquant; /* MB quantization */

  3063.     int ttmb = v->ttfrm; /* MB Transform type */

  3064.     int status;

  3065. 

  3066.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3067.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3068.     int mb_has_coeffs = 1; /* last_flag */

  3069.     int dmv_x, dmv_y; /* Differential MV components */

  3070.     int index, index1; /* LUT indices */

  3071.     int val, sign; /* temp values */

  3072.     int first_block = 1;

  3073.     int dst_idx, off;

  3074.     int skipped, fourmv;

  3075. 

  3076.     mquant = v->pq; /* Loosy initialization */

  3077. 

  3078.     if (v->mv_type_is_raw)

  3079.         fourmv = get_bits1(gb);

  3080.     else

  3081.         fourmv = v->mv_type_mb_plane[mb_pos];

  3082.     if (v->skip_is_raw)

  3083.         skipped = get_bits1(gb);

  3084.     else

  3085.         skipped = v->s.mbskip_table[mb_pos];

  3086. 

  3087.     s->dsp.clear_blocks(s->block[0]);

  3088. 

  3089.     if (!fourmv) /* 1MV mode */

  3090.     {

  3091.         if (!skipped)

  3092.         {

  3093.             GET_MVDATA(dmv_x, dmv_y);

  3094. 

  3095.             if (s->mb_intra) {

  3096.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3097.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3098.             }

  3099.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3100.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3101. 

  3102.             /* FIXME Set DC val for inter block ? */

  3103.             if (s->mb_intra && !mb_has_coeffs)

  3104.             {

  3105.                 GET_MQUANT();

  3106.                 s->ac_pred = get_bits(gb, 1);

  3107.                 cbp = 0;

  3108.             }

  3109.             else if (mb_has_coeffs)

  3110.             {

  3111.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  3112.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3113.                 GET_MQUANT();

  3114.             }

  3115.             else

  3116.             {

  3117.                 mquant = v->pq;

  3118.                 cbp = 0;

  3119.             }

  3120.             s->current_picture.qscale_table[mb_pos] = mquant;

  3121. 

  3122.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3123.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3124.                                 VC1_TTMB_VLC_BITS, 2);

  3125.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3126.             dst_idx = 0;

  3127.             for (i=0; i<6; i++)

  3128.             {

  3129.                 s->dc_val[0][s->block_index[i]] = 0;

  3130.                 dst_idx += i >> 2;

  3131.                 val = ((cbp >> (5 - i)) & 1);

  3132.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3133.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3134.                 if(s->mb_intra) {

  3135.                     /* check if prediction blocks A and C are available */

  3136.                     v->a_avail = v->c_avail = 0;

  3137.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3138.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3139.                     if(i == 1 || i == 3 || s->mb_x)

  3140.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3141. 

  3142.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3143.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3144.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3145.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3146.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3147.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3148.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3149.                     if(v->pq >= 9 && v->overlap) {

  3150.                         if(v->c_avail)

  3151.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3152.                         if(v->a_avail)

  3153.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3154.                     }

  3155.                 } else if(val) {

  3156.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3157.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3158.                     first_block = 0;

  3159.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3160.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3161.                 }

  3162.             }

  3163.         }

  3164.         else //Skipped

  3165.         {

  3166.             s->mb_intra = 0;

  3167.             for(i = 0; i < 6; i++) {

  3168.                 v->mb_type[0][s->block_index[i]] = 0;

  3169.                 s->dc_val[0][s->block_index[i]] = 0;

  3170.             }

  3171.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3172.             s->current_picture.qscale_table[mb_pos] = 0;

  3173.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3174.             vc1_mc_1mv(v, 0);

  3175.             return 0;

  3176.         }

  3177.     } //1MV mode

  3178.     else //4MV mode

  3179.     {

  3180.         if (!skipped /* unskipped MB */)

  3181.         {

  3182.             int intra_count = 0, coded_inter = 0;

  3183.             int is_intra[6], is_coded[6];

  3184.             /* Get CBPCY */

  3185.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3186.             for (i=0; i<6; i++)

  3187.             {

  3188.                 val = ((cbp >> (5 - i)) & 1);

  3189.                 s->dc_val[0][s->block_index[i]] = 0;

  3190.                 s->mb_intra = 0;

  3191.                 if(i < 4) {

  3192.                     dmv_x = dmv_y = 0;

  3193.                     s->mb_intra = 0;

  3194.                     mb_has_coeffs = 0;

  3195.                     if(val) {

  3196.                         GET_MVDATA(dmv_x, dmv_y);

  3197.                     }

  3198.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3199.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3200.                     intra_count += s->mb_intra;

  3201.                     is_intra[i] = s->mb_intra;

  3202.                     is_coded[i] = mb_has_coeffs;

  3203.                 }

  3204.                 if(i&4){

  3205.                     is_intra[i] = (intra_count >= 3);

  3206.                     is_coded[i] = val;

  3207.                 }

  3208.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3209.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3210.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3211.             }

  3212.             // if there are no coded blocks then don't do anything more

  3213.             if(!intra_count && !coded_inter) return 0;

  3214.             dst_idx = 0;

  3215.             GET_MQUANT();

  3216.             s->current_picture.qscale_table[mb_pos] = mquant;

  3217.             /* test if block is intra and has pred */

  3218.             {

  3219.                 int intrapred = 0;

  3220.                 for(i=0; i<6; i++)

  3221.                     if(is_intra[i]) {

  3222.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3223.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3224.                             intrapred = 1;

  3225.                             break;

  3226.                         }

  3227.                     }

  3228.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  3229.                 else s->ac_pred = 0;

  3230.             }

  3231.             if (!v->ttmbf && coded_inter)

  3232.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3233.             for (i=0; i<6; i++)

  3234.             {

  3235.                 dst_idx += i >> 2;

  3236.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3237.                 s->mb_intra = is_intra[i];

  3238.                 if (is_intra[i]) {

  3239.                     /* check if prediction blocks A and C are available */

  3240.                     v->a_avail = v->c_avail = 0;

  3241.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3242.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3243.                     if(i == 1 || i == 3 || s->mb_x)

  3244.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3245. 

  3246.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3247.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3248.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3249.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3250.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3251.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3252.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3253.                     if(v->pq >= 9 && v->overlap) {

  3254.                         if(v->c_avail)

  3255.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3256.                         if(v->a_avail)

  3257.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3258.                     }

  3259.                 } else if(is_coded[i]) {

  3260.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3261.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3262.                     first_block = 0;

  3263.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3264.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3265.                 }

  3266.             }

  3267.             return status;

  3268.         }

  3269.         else //Skipped MB

  3270.         {

  3271.             s->mb_intra = 0;

  3272.             s->current_picture.qscale_table[mb_pos] = 0;

  3273.             for (i=0; i<6; i++) {

  3274.                 v->mb_type[0][s->block_index[i]] = 0;

  3275.                 s->dc_val[0][s->block_index[i]] = 0;

  3276.             }

  3277.             for (i=0; i<4; i++)

  3278.             {

  3279.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3280.                 vc1_mc_4mv_luma(v, i);

  3281.             }

  3282.             vc1_mc_4mv_chroma(v);

  3283.             s->current_picture.qscale_table[mb_pos] = 0;

  3284.             return 0;

  3285.         }

  3286.     }

  3287. 

  3288.     /* Should never happen */

  3289.     return -1;

  3290. }

  3291. 

  3292. /** Decode one B-frame MB (in Main profile)

  3293.  */

  3294. static void vc1_decode_b_mb(VC1Context *v)

  3295. {

  3296.     MpegEncContext *s = &v->s;

  3297.     GetBitContext *gb = &s->gb;

  3298.     int i, j;

  3299.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3300.     int cbp = 0; /* cbp decoding stuff */

  3301.     int mqdiff, mquant; /* MB quantization */

  3302.     int ttmb = v->ttfrm; /* MB Transform type */

  3303. 

  3304.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3305.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3306.     int mb_has_coeffs = 0; /* last_flag */

  3307.     int index, index1; /* LUT indices */

  3308.     int val, sign; /* temp values */

  3309.     int first_block = 1;

  3310.     int dst_idx, off;

  3311.     int skipped, direct;

  3312.     int dmv_x[2], dmv_y[2];

  3313.     int bmvtype = BMV_TYPE_BACKWARD;

  3314. 

  3315.     mquant = v->pq; /* Loosy initialization */

  3316.     s->mb_intra = 0;

  3317. 

  3318.     if (v->dmb_is_raw)

  3319.         direct = get_bits1(gb);

  3320.     else

  3321.         direct = v->direct_mb_plane[mb_pos];

  3322.     if (v->skip_is_raw)

  3323.         skipped = get_bits1(gb);

  3324.     else

  3325.         skipped = v->s.mbskip_table[mb_pos];

  3326. 

  3327.     s->dsp.clear_blocks(s->block[0]);

  3328.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3329.     for(i = 0; i < 6; i++) {

  3330.         v->mb_type[0][s->block_index[i]] = 0;

  3331.         s->dc_val[0][s->block_index[i]] = 0;

  3332.     }

  3333.     s->current_picture.qscale_table[mb_pos] = 0;

  3334. 

  3335.     if (!direct) {

  3336.         if (!skipped) {

  3337.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3338.             dmv_x[1] = dmv_x[0];

  3339.             dmv_y[1] = dmv_y[0];

  3340.         }

  3341.         if(skipped || !s->mb_intra) {

  3342.             bmvtype = decode012(gb);

  3343.             switch(bmvtype) {

  3344.             case 0:

  3345.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3346.                 break;

  3347.             case 1:

  3348.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3349.                 break;

  3350.             case 2:

  3351.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3352.                 dmv_x[0] = dmv_y[0] = 0;

  3353.             }

  3354.         }

  3355.     }

  3356.     for(i = 0; i < 6; i++)

  3357.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3358. 

  3359.     if (skipped) {

  3360.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3361.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3362.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3363.         return;

  3364.     }

  3365.     if (direct) {

  3366.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3367.         GET_MQUANT();

  3368.         s->mb_intra = 0;

  3369.         mb_has_coeffs = 0;

  3370.         s->current_picture.qscale_table[mb_pos] = mquant;

  3371.         if(!v->ttmbf)

  3372.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3373.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3374.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3375.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3376.     } else {

  3377.         if(!mb_has_coeffs && !s->mb_intra) {

  3378.             /* no coded blocks - effectively skipped */

  3379.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3380.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3381.             return;

  3382.         }

  3383.         if(s->mb_intra && !mb_has_coeffs) {

  3384.             GET_MQUANT();

  3385.             s->current_picture.qscale_table[mb_pos] = mquant;

  3386.             s->ac_pred = get_bits1(gb);

  3387.             cbp = 0;

  3388.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3389.         } else {

  3390.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3391.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3392.                 if(!mb_has_coeffs) {

  3393.                     /* interpolated skipped block */

  3394.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3395.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3396.                     return;

  3397.                 }

  3398.             }

  3399.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3400.             if(!s->mb_intra) {

  3401.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3402.             }

  3403.             if(s->mb_intra)

  3404.                 s->ac_pred = get_bits1(gb);

  3405.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3406.             GET_MQUANT();

  3407.             s->current_picture.qscale_table[mb_pos] = mquant;

  3408.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3409.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3410.         }

  3411.     }

  3412.     dst_idx = 0;

  3413.     for (i=0; i<6; i++)

  3414.     {

  3415.         s->dc_val[0][s->block_index[i]] = 0;

  3416.         dst_idx += i >> 2;

  3417.         val = ((cbp >> (5 - i)) & 1);

  3418.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3419.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3420.         if(s->mb_intra) {

  3421.             /* check if prediction blocks A and C are available */

  3422.             v->a_avail = v->c_avail = 0;

  3423.             if(i == 2 || i == 3 || !s->first_slice_line)

  3424.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3425.             if(i == 1 || i == 3 || s->mb_x)

  3426.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3427. 

  3428.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3429.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3430.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3431.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3432.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3433.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3434.         } else if(val) {

  3435.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3436.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3437.             first_block = 0;

  3438.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3439.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3440.         }

  3441.     }

  3442. }

  3443. 

  3444. /** Decode blocks of I-frame

  3445.  */

  3446. static void vc1_decode_i_blocks(VC1Context *v)

  3447. {

  3448.     int k, j;

  3449.     MpegEncContext *s = &v->s;

  3450.     int cbp, val;

  3451.     uint8_t *coded_val;

  3452.     int mb_pos;

  3453. 

  3454.     /* select codingmode used for VLC tables selection */

  3455.     switch(v->y_ac_table_index){

  3456.     case 0:

  3457.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3458.         break;

  3459.     case 1:

  3460.         v->codingset = CS_HIGH_MOT_INTRA;

  3461.         break;

  3462.     case 2:

  3463.         v->codingset = CS_MID_RATE_INTRA;

  3464.         break;

  3465.     }

  3466. 

  3467.     switch(v->c_ac_table_index){

  3468.     case 0:

  3469.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3470.         break;

  3471.     case 1:

  3472.         v->codingset2 = CS_HIGH_MOT_INTER;

  3473.         break;

  3474.     case 2:

  3475.         v->codingset2 = CS_MID_RATE_INTER;

  3476.         break;

  3477.     }

  3478. 

  3479.     /* Set DC scale - y and c use the same */

  3480.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3481.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3482. 

  3483.     //do frame decode

  3484.     s->mb_x = s->mb_y = 0;

  3485.     s->mb_intra = 1;

  3486.     s->first_slice_line = 1;

  3487.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3488.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3489.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3490.             ff_init_block_index(s);

  3491.             ff_update_block_index(s);

  3492.             s->dsp.clear_blocks(s->block[0]);

  3493.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3494.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3495.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3496.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3497.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3498. 

  3499.             // do actual MB decoding and displaying

  3500.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3501.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  3502. 

  3503.             for(k = 0; k < 6; k++) {

  3504.                 val = ((cbp >> (5 - k)) & 1);

  3505. 

  3506.                 if (k < 4) {

  3507.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3508.                     val = val ^ pred;

  3509.                     *coded_val = val;

  3510.                 }

  3511.                 cbp |= val << (5 - k);

  3512. 

  3513.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3514. 

  3515.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3516.                 if(!v->res_fasttx && !v->res_x8) for(j = 0; j < 64; j++) s->block[k][j] -= 16;

  3517.                 if(v->pq >= 9 && v->overlap) {

  3518.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3519.                 }

  3520.             }

  3521. 

  3522.             vc1_put_block(v, s->block);

  3523.             if(v->pq >= 9 && v->overlap) {

  3524.                 if(s->mb_x) {

  3525.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3526.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3527.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3528.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3529.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3530.                     }

  3531.                 }

  3532.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3533.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3534.                 if(!s->first_slice_line) {

  3535.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3536.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3537.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3538.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3539.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3540.                     }

  3541.                 }

  3542.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3543.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3544.             }

  3545. 

  3546.             if(get_bits_count(&s->gb) > v->bits) {

  3547.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3548.                 return;

  3549.             }

  3550.         }

  3551.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3552.         s->first_slice_line = 0;

  3553.     }

  3554. }

  3555. 

  3556. /** Decode blocks of I-frame for advanced profile

  3557.  */

  3558. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3559. {

  3560.     int k, j;

  3561.     MpegEncContext *s = &v->s;

  3562.     int cbp, val;

  3563.     uint8_t *coded_val;

  3564.     int mb_pos;

  3565.     int mquant = v->pq;

  3566.     int mqdiff;

  3567.     int overlap;

  3568.     GetBitContext *gb = &s->gb;

  3569. 

  3570.     /* select codingmode used for VLC tables selection */

  3571.     switch(v->y_ac_table_index){

  3572.     case 0:

  3573.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3574.         break;

  3575.     case 1:

  3576.         v->codingset = CS_HIGH_MOT_INTRA;

  3577.         break;

  3578.     case 2:

  3579.         v->codingset = CS_MID_RATE_INTRA;

  3580.         break;

  3581.     }

  3582. 

  3583.     switch(v->c_ac_table_index){

  3584.     case 0:

  3585.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3586.         break;

  3587.     case 1:

  3588.         v->codingset2 = CS_HIGH_MOT_INTER;

  3589.         break;

  3590.     case 2:

  3591.         v->codingset2 = CS_MID_RATE_INTER;

  3592.         break;

  3593.     }

  3594. 

  3595.     //do frame decode

  3596.     s->mb_x = s->mb_y = 0;

  3597.     s->mb_intra = 1;

  3598.     s->first_slice_line = 1;

  3599.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3600.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3601.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3602.             ff_init_block_index(s);

  3603.             ff_update_block_index(s);

  3604.             s->dsp.clear_blocks(s->block[0]);

  3605.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3606.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3607.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3608.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3609. 

  3610.             // do actual MB decoding and displaying

  3611.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3612.             if(v->acpred_is_raw)

  3613.                 v->s.ac_pred = get_bits(&v->s.gb, 1);

  3614.             else

  3615.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3616. 

  3617.             if(v->condover == CONDOVER_SELECT) {

  3618.                 if(v->overflg_is_raw)

  3619.                     overlap = get_bits(&v->s.gb, 1);

  3620.                 else

  3621.                     overlap = v->over_flags_plane[mb_pos];

  3622.             } else

  3623.                 overlap = (v->condover == CONDOVER_ALL);

  3624. 

  3625.             GET_MQUANT();

  3626. 

  3627.             s->current_picture.qscale_table[mb_pos] = mquant;

  3628.             /* Set DC scale - y and c use the same */

  3629.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3630.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3631. 

  3632.             for(k = 0; k < 6; k++) {

  3633.                 val = ((cbp >> (5 - k)) & 1);

  3634. 

  3635.                 if (k < 4) {

  3636.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3637.                     val = val ^ pred;

  3638.                     *coded_val = val;

  3639.                 }

  3640.                 cbp |= val << (5 - k);

  3641. 

  3642.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3643.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3644. 

  3645.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3646. 

  3647.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3648.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3649.             }

  3650. 

  3651.             vc1_put_block(v, s->block);

  3652.             if(overlap) {

  3653.                 if(s->mb_x) {

  3654.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3655.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3656.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3657.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3658.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3659.                     }

  3660.                 }

  3661.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3662.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3663.                 if(!s->first_slice_line) {

  3664.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3665.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3666.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3667.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3668.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3669.                     }

  3670.                 }

  3671.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3672.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3673.             }

  3674. 

  3675.             if(get_bits_count(&s->gb) > v->bits) {

  3676.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3677.                 return;

  3678.             }

  3679.         }

  3680.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3681.         s->first_slice_line = 0;

  3682.     }

  3683. }

  3684. 

  3685. static void vc1_decode_p_blocks(VC1Context *v)

  3686. {

  3687.     MpegEncContext *s = &v->s;

  3688. 

  3689.     /* select codingmode used for VLC tables selection */

  3690.     switch(v->c_ac_table_index){

  3691.     case 0:

  3692.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3693.         break;

  3694.     case 1:

  3695.         v->codingset = CS_HIGH_MOT_INTRA;

  3696.         break;

  3697.     case 2:

  3698.         v->codingset = CS_MID_RATE_INTRA;

  3699.         break;

  3700.     }

  3701. 

  3702.     switch(v->c_ac_table_index){

  3703.     case 0:

  3704.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3705.         break;

  3706.     case 1:

  3707.         v->codingset2 = CS_HIGH_MOT_INTER;

  3708.         break;

  3709.     case 2:

  3710.         v->codingset2 = CS_MID_RATE_INTER;

  3711.         break;

  3712.     }

  3713. 

  3714.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3715.     s->first_slice_line = 1;

  3716.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3717.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3718.             ff_init_block_index(s);

  3719.             ff_update_block_index(s);

  3720.             s->dsp.clear_blocks(s->block[0]);

  3721. 

  3722.             vc1_decode_p_mb(v);

  3723.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3724.                 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);

  3725.                 return;

  3726.             }

  3727.         }

  3728.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3729.         s->first_slice_line = 0;

  3730.     }

  3731. }

  3732. 

  3733. static void vc1_decode_b_blocks(VC1Context *v)

  3734. {

  3735.     MpegEncContext *s = &v->s;

  3736. 

  3737.     /* select codingmode used for VLC tables selection */

  3738.     switch(v->c_ac_table_index){

  3739.     case 0:

  3740.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3741.         break;

  3742.     case 1:

  3743.         v->codingset = CS_HIGH_MOT_INTRA;

  3744.         break;

  3745.     case 2:

  3746.         v->codingset = CS_MID_RATE_INTRA;

  3747.         break;

  3748.     }

  3749. 

  3750.     switch(v->c_ac_table_index){

  3751.     case 0:

  3752.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3753.         break;

  3754.     case 1:

  3755.         v->codingset2 = CS_HIGH_MOT_INTER;

  3756.         break;

  3757.     case 2:

  3758.         v->codingset2 = CS_MID_RATE_INTER;

  3759.         break;

  3760.     }

  3761. 

  3762.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3763.     s->first_slice_line = 1;

  3764.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3765.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3766.             ff_init_block_index(s);

  3767.             ff_update_block_index(s);

  3768.             s->dsp.clear_blocks(s->block[0]);

  3769. 

  3770.             vc1_decode_b_mb(v);

  3771.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3772.                 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);

  3773.                 return;

  3774.             }

  3775.         }

  3776.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3777.         s->first_slice_line = 0;

  3778.     }

  3779. }

  3780. 

  3781. static void vc1_decode_skip_blocks(VC1Context *v)

  3782. {

  3783.     MpegEncContext *s = &v->s;

  3784. 

  3785.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3786.     s->first_slice_line = 1;

  3787.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3788.         s->mb_x = 0;

  3789.         ff_init_block_index(s);

  3790.         ff_update_block_index(s);

  3791.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  3792.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3793.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3794.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3795.         s->first_slice_line = 0;

  3796.     }

  3797.     s->pict_type = P_TYPE;

  3798. }

  3799. 

  3800. static void vc1_decode_blocks(VC1Context *v)

  3801. {

  3802. 

  3803.     v->s.esc3_level_length = 0;

  3804. 

  3805.     switch(v->s.pict_type) {

  3806.     case I_TYPE:

  3807.         if(v->profile == PROFILE_ADVANCED)

  3808.             vc1_decode_i_blocks_adv(v);

  3809.         else

  3810.             vc1_decode_i_blocks(v);

  3811.         break;

  3812.     case P_TYPE:

  3813.         if(v->p_frame_skipped)

  3814.             vc1_decode_skip_blocks(v);

  3815.         else

  3816.             vc1_decode_p_blocks(v);

  3817.         break;

  3818.     case B_TYPE:

  3819.         if(v->bi_type){

  3820.             if(v->profile == PROFILE_ADVANCED)

  3821.                 vc1_decode_i_blocks_adv(v);

  3822.             else

  3823.                 vc1_decode_i_blocks(v);

  3824.         }else

  3825.             vc1_decode_b_blocks(v);

  3826.         break;

  3827.     }

  3828. }

  3829. 

  3830. /** Find VC-1 marker in buffer

  3831.  * @return position where next marker starts or end of buffer if no marker found

  3832.  */

  3833. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  3834. {

  3835.     uint32_t mrk = 0xFFFFFFFF;

  3836. 

  3837.     if(end-src < 4) return end;

  3838.     while(src < end){

  3839.         mrk = (mrk << 8) | *src++;

  3840.         if(IS_MARKER(mrk))

  3841.             return src-4;

  3842.     }

  3843.     return end;

  3844. }

  3845. 

  3846. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  3847. {

  3848.     int dsize = 0, i;

  3849. 

  3850.     if(size < 4){

  3851.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  3852.         return size;

  3853.     }

  3854.     for(i = 0; i < size; i++, src++) {

  3855.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  3856.             dst[dsize++] = src[1];

  3857.             src++;

  3858.             i++;

  3859.         } else

  3860.             dst[dsize++] = *src;

  3861.     }

  3862.     return dsize;

  3863. }

  3864. 

  3865. /** Initialize a VC1/WMV3 decoder

  3866.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3867.  * @todo TODO: Decypher remaining bits in extra_data

  3868.  */

  3869. static int vc1_decode_init(AVCodecContext *avctx)

  3870. {

  3871.     VC1Context *v = avctx->priv_data;

  3872.     MpegEncContext *s = &v->s;

  3873.     GetBitContext gb;

  3874. 

  3875.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3876.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3877.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3878.     else

  3879.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3880.     v->s.avctx = avctx;

  3881.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3882.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3883. 

  3884.     if(ff_h263_decode_init(avctx) < 0)

  3885.         return -1;

  3886.     if (vc1_init_common(v) < 0) return -1;

  3887. 

  3888.     avctx->coded_width = avctx->width;

  3889.     avctx->coded_height = avctx->height;

  3890.     if (avctx->codec_id == CODEC_ID_WMV3)

  3891.     {

  3892.         int count = 0;

  3893. 

  3894.         // looks like WMV3 has a sequence header stored in the extradata

  3895.         // advanced sequence header may be before the first frame

  3896.         // the last byte of the extradata is a version number, 1 for the

  3897.         // samples we can decode

  3898. 

  3899.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3900. 

  3901.         if (decode_sequence_header(avctx, &gb) < 0)

  3902.           return -1;

  3903. 

  3904.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3905.         if (count>0)

  3906.         {

  3907.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3908.                    count, get_bits(&gb, count));

  3909.         }

  3910.         else if (count < 0)

  3911.         {

  3912.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3913.         }

  3914.     } else { // VC1/WVC1

  3915.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  3916.         uint8_t *next; int size, buf2_size;

  3917.         uint8_t *buf2 = NULL;

  3918.         int seq_inited = 0, ep_inited = 0;

  3919. 

  3920.         if(avctx->extradata_size < 16) {

  3921.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  3922.             return -1;

  3923.         }

  3924. 

  3925.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3926.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  3927.         next = start;

  3928.         for(; next < end; start = next){

  3929.             next = find_next_marker(start + 4, end);

  3930.             size = next - start - 4;

  3931.             if(size <= 0) continue;

  3932.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  3933.             init_get_bits(&gb, buf2, buf2_size * 8);

  3934.             switch(AV_RB32(start)){

  3935.             case VC1_CODE_SEQHDR:

  3936.                 if(decode_sequence_header(avctx, &gb) < 0){

  3937.                     av_free(buf2);

  3938.                     return -1;

  3939.                 }

  3940.                 seq_inited = 1;

  3941.                 break;

  3942.             case VC1_CODE_ENTRYPOINT:

  3943.                 if(decode_entry_point(avctx, &gb) < 0){

  3944.                     av_free(buf2);

  3945.                     return -1;

  3946.                 }

  3947.                 ep_inited = 1;

  3948.                 break;

  3949.             }

  3950.         }

  3951.         av_free(buf2);

  3952.         if(!seq_inited || !ep_inited){

  3953.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  3954.             return -1;

  3955.         }

  3956.     }

  3957.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3958.     s->low_delay = !avctx->has_b_frames;

  3959. 

  3960.     s->mb_width = (avctx->coded_width+15)>>4;

  3961.     s->mb_height = (avctx->coded_height+15)>>4;

  3962. 

  3963.     /* Allocate mb bitplanes */

  3964.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3965.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3966.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  3967.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  3968. 

  3969.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3970.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3971.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3972.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3973.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3974. 

  3975.     /* Init coded blocks info */

  3976.     if (v->profile == PROFILE_ADVANCED)

  3977.     {

  3978. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3979. //            return -1;

  3980. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3981. //            return -1;

  3982.     }

  3983. 

  3984.     return 0;

  3985. }

  3986. 

  3987. 

  3988. /** Decode a VC1/WMV3 frame

  3989.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3990.  */

  3991. static int vc1_decode_frame(AVCodecContext *avctx,

  3992.                             void *data, int *data_size,

  3993.                             uint8_t *buf, int buf_size)

  3994. {

  3995.     VC1Context *v = avctx->priv_data;

  3996.     MpegEncContext *s = &v->s;

  3997.     AVFrame *pict = data;

  3998.     uint8_t *buf2 = NULL;

  3999. 

  4000.     /* no supplementary picture */

  4001.     if (buf_size == 0) {

  4002.         /* special case for last picture */

  4003.         if (s->low_delay==0 && s->next_picture_ptr) {

  4004.             *pict= *(AVFrame*)s->next_picture_ptr;

  4005.             s->next_picture_ptr= NULL;

  4006. 

  4007.             *data_size = sizeof(AVFrame);

  4008.         }

  4009. 

  4010.         return 0;

  4011.     }

  4012. 

  4013.     /* We need to set current_picture_ptr before reading the header,

  4014.      * otherwise we cannot store anything in there. */

  4015.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  4016.         int i= ff_find_unused_picture(s, 0);

  4017.         s->current_picture_ptr= &s->picture[i];

  4018.     }

  4019. 

  4020.     //for advanced profile we may need to parse and unescape data

  4021.     if (avctx->codec_id == CODEC_ID_VC1) {

  4022.         int buf_size2 = 0;

  4023.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4024. 

  4025.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  4026.             uint8_t *start, *end, *next;

  4027.             int size;

  4028. 

  4029.             next = buf;

  4030.             for(start = buf, end = buf + buf_size; next < end; start = next){

  4031.                 next = find_next_marker(start + 4, end);

  4032.                 size = next - start - 4;

  4033.                 if(size <= 0) continue;

  4034.                 switch(AV_RB32(start)){

  4035.                 case VC1_CODE_FRAME:

  4036.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4037.                     break;

  4038.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4039.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4040.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4041.                     decode_entry_point(avctx, &s->gb);

  4042.                     break;

  4043.                 case VC1_CODE_SLICE:

  4044.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4045.                     av_free(buf2);

  4046.                     return -1;

  4047.                 }

  4048.             }

  4049.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4050.             uint8_t *divider;

  4051. 

  4052.             divider = find_next_marker(buf, buf + buf_size);

  4053.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4054.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4055.                 return -1;

  4056.             }

  4057. 

  4058.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4059.             // TODO

  4060.             av_free(buf2);return -1;

  4061.         }else{

  4062.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4063.         }

  4064.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4065.     } else

  4066.         init_get_bits(&s->gb, buf, buf_size*8);

  4067.     // do parse frame header

  4068.     if(v->profile < PROFILE_ADVANCED) {

  4069.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4070.             av_free(buf2);

  4071.             return -1;

  4072.         }

  4073.     } else {

  4074.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4075.             av_free(buf2);

  4076.             return -1;

  4077.         }

  4078.     }

  4079. 

  4080.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4081.         av_free(buf2);

  4082.         return -1;

  4083.     }

  4084. 

  4085.     // for hurry_up==5

  4086.     s->current_picture.pict_type= s->pict_type;

  4087.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4088. 

  4089.     /* skip B-frames if we don't have reference frames */

  4090.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4091.         av_free(buf2);

  4092.         return -1;//buf_size;

  4093.     }

  4094.     /* skip b frames if we are in a hurry */

  4095.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4096.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4097.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4098.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4099.         av_free(buf2);

  4100.         return buf_size;

  4101.     }

  4102.     /* skip everything if we are in a hurry>=5 */

  4103.     if(avctx->hurry_up>=5) {

  4104.         av_free(buf2);

  4105.         return -1;//buf_size;

  4106.     }

  4107. 

  4108.     if(s->next_p_frame_damaged){

  4109.         if(s->pict_type==B_TYPE)

  4110.             return buf_size;

  4111.         else

  4112.             s->next_p_frame_damaged=0;

  4113.     }

  4114. 

  4115.     if(MPV_frame_start(s, avctx) < 0) {

  4116.         av_free(buf2);

  4117.         return -1;

  4118.     }

  4119. 

  4120.     ff_er_frame_start(s);

  4121. 

  4122.     v->bits = buf_size * 8;

  4123.     vc1_decode_blocks(v);

  4124. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4125. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4126. //      return -1;

  4127.     ff_er_frame_end(s);

  4128. 

  4129.     MPV_frame_end(s);

  4130. 

  4131. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4132. assert(s->current_picture.pict_type == s->pict_type);

  4133.     if (s->pict_type == B_TYPE || s->low_delay) {

  4134.         *pict= *(AVFrame*)s->current_picture_ptr;

  4135.     } else if (s->last_picture_ptr != NULL) {

  4136.         *pict= *(AVFrame*)s->last_picture_ptr;

  4137.     }

  4138. 

  4139.     if(s->last_picture_ptr || s->low_delay){

  4140.         *data_size = sizeof(AVFrame);

  4141.         ff_print_debug_info(s, pict);

  4142.     }

  4143. 

  4144.     /* Return the Picture timestamp as the frame number */

  4145.     /* we substract 1 because it is added on utils.c    */

  4146.     avctx->frame_number = s->picture_number - 1;

  4147. 

  4148.     av_free(buf2);

  4149.     return buf_size;

  4150. }

  4151. 

  4152. 

  4153. /** Close a VC1/WMV3 decoder

  4154.  * @warning Initial try at using MpegEncContext stuff

  4155.  */

  4156. static int vc1_decode_end(AVCodecContext *avctx)

  4157. {

  4158.     VC1Context *v = avctx->priv_data;

  4159. 

  4160.     av_freep(&v->hrd_rate);

  4161.     av_freep(&v->hrd_buffer);

  4162.     MPV_common_end(&v->s);

  4163.     av_freep(&v->mv_type_mb_plane);

  4164.     av_freep(&v->direct_mb_plane);

  4165.     av_freep(&v->acpred_plane);

  4166.     av_freep(&v->over_flags_plane);

  4167.     av_freep(&v->mb_type_base);

  4168.     return 0;

  4169. }

  4170. 

  4171. 

  4172. AVCodec vc1_decoder = {

  4173.     "vc1",

  4174.     CODEC_TYPE_VIDEO,

  4175.     CODEC_ID_VC1,

  4176.     sizeof(VC1Context),

  4177.     vc1_decode_init,

  4178.     NULL,

  4179.     vc1_decode_end,

  4180.     vc1_decode_frame,

  4181.     CODEC_CAP_DELAY,

  4182.     NULL

  4183. };

  4184. 

  4185. AVCodec wmv3_decoder = {

  4186.     "wmv3",

  4187.     CODEC_TYPE_VIDEO,

  4188.     CODEC_ID_WMV3,

  4189.     sizeof(VC1Context),

  4190.     vc1_decode_init,

  4191.     NULL,

  4192.     vc1_decode_end,

  4193.     vc1_decode_frame,

  4194.     CODEC_CAP_DELAY,

  4195.     NULL

  4196. };