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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. 

  36. #undef NDEBUG

  37. #include <assert.h>

  38. 

  39. extern const uint32_t ff_table0_dc_lum[120][2], ff_table1_dc_lum[120][2];

  40. extern const uint32_t ff_table0_dc_chroma[120][2], ff_table1_dc_chroma[120][2];

  41. extern VLC ff_msmp4_dc_luma_vlc[2], ff_msmp4_dc_chroma_vlc[2];

  42. #define MB_INTRA_VLC_BITS 9

  43. extern VLC ff_msmp4_mb_i_vlc;

  44. extern const uint16_t ff_msmp4_mb_i_table[64][2];

  45. #define DC_VLC_BITS 9

  46. #define AC_VLC_BITS 9

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

  48. 

  49. 

  50. /**

  51.  * Get unary code of limited length

  52.  * @fixme FIXME Slow and ugly

  53.  * @param gb GetBitContext

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

  55.  * @param[in] len Maximum length

  56.  * @return Unary length/index

  57.  */

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

  59. {

  60. #if 1

  61.     int i;

  62. 

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

  64.     return i;

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

  66. 

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

  68.   {

  69.     tmp = get_bits(gb, 1);

  70.     i++;

  71.   }

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

  73.   return i;*/

  74. #else

  75.   unsigned int buf;

  76.   int log;

  77. 

  78.   OPEN_READER(re, gb);

  79.   UPDATE_CACHE(re, gb);

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

  81.   if (stop) buf = ~buf;

  82. 

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

  84.   if (log < limit){

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

  86.     CLOSE_READER(re, gb);

  87.     return log;

  88.   }

  89. 

  90.   LAST_SKIP_BITS(re, gb, limit);

  91.   CLOSE_READER(re, gb);

  92.   return limit;

  93. #endif

  94. }

  95. 

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

  97.     int n;

  98.     n = get_bits1(gb);

  99.     if (n == 1)

  100.         return 0;

  101.     else

  102.         return 2 - get_bits1(gb);

  103. }

  104. 

  105. /**

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

  107.  * @param v The VC1Context to initialize

  108.  * @return Status

  109.  */

  110. static int vc1_init_common(VC1Context *v)

  111. {

  112.     static int done = 0;

  113.     int i = 0;

  114. 

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

  116. 

  117.     /* VLC tables */

  118.     if(!done)

  119.     {

  120.         done = 1;

  121.         init_vlc(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  122.                  ff_vc1_bfraction_bits, 1, 1,

  123.                  ff_vc1_bfraction_codes, 1, 1, 1);

  124.         init_vlc(&ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  125.                  ff_vc1_norm2_bits, 1, 1,

  126.                  ff_vc1_norm2_codes, 1, 1, 1);

  127.         init_vlc(&ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  128.                  ff_vc1_norm6_bits, 1, 1,

  129.                  ff_vc1_norm6_codes, 2, 2, 1);

  130.         init_vlc(&ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  131.                  ff_vc1_imode_bits, 1, 1,

  132.                  ff_vc1_imode_codes, 1, 1, 1);

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

  134.         {

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

  136.                      ff_vc1_ttmb_bits[i], 1, 1,

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

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

  139.                      ff_vc1_ttblk_bits[i], 1, 1,

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

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

  142.                      ff_vc1_subblkpat_bits[i], 1, 1,

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

  144.         }

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

  146.         {

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

  148.                      ff_vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  151.                      ff_vc1_cbpcy_p_bits[i], 1, 1,

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

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

  154.                      ff_vc1_mv_diff_bits[i], 1, 1,

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

  156.         }

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

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

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

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

  161.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  164.     }

  165. 

  166.     /* Other defaults */

  167.     v->pq = -1;

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

  169. 

  170.     return 0;

  171. }

  172. 

  173. /***********************************************************************/

  174. /**

  175.  * @defgroup bitplane VC9 Bitplane decoding

  176.  * @see 8.7, p56

  177.  * @{

  178.  */

  179. 

  180. /** @addtogroup bitplane

  181.  * Imode types

  182.  * @{

  183.  */

  184. enum Imode {

  185.     IMODE_RAW,

  186.     IMODE_NORM2,

  187.     IMODE_DIFF2,

  188.     IMODE_NORM6,

  189.     IMODE_DIFF6,

  190.     IMODE_ROWSKIP,

  191.     IMODE_COLSKIP

  192. };

  193. /** @} */ //imode defines

  194. 

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

  196.  * @param plane Buffer to store decoded bits

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

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

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

  200.  */

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

  202.     int x, y;

  203. 

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

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

  206.             memset(plane, 0, width);

  207.         else

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

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

  210.         plane += stride;

  211.     }

  212. }

  213. 

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

  215.  * @param plane Buffer to store decoded bits

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

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

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

  219.  * @fixme FIXME: Optimize

  220.  */

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

  222.     int x, y;

  223. 

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

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

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

  227.                 plane[y*stride] = 0;

  228.         else

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

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

  231.         plane ++;

  232.     }

  233. }

  234. 

  235. /** Decode a bitplane's bits

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

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

  238.  * @return Status

  239.  * @fixme FIXME: Optimize

  240.  */

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

  242. {

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

  244. 

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

  246.     uint8_t invert, *planep = data;

  247.     int width, height, stride;

  248. 

  249.     width = v->s.mb_width;

  250.     height = v->s.mb_height;

  251.     stride = v->s.mb_stride;

  252.     invert = get_bits(gb, 1);

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

  254. 

  255.     *raw_flag = 0;

  256.     switch (imode)

  257.     {

  258.     case IMODE_RAW:

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

  260.         *raw_flag = 1; //invert ignored

  261.         return invert;

  262.     case IMODE_DIFF2:

  263.     case IMODE_NORM2:

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

  265.         {

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

  267.             offset = 1;

  268.         }

  269.         else offset = 0;

  270.         // decode bitplane as one long line

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

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

  273.             *planep++ = code & 1;

  274.             offset++;

  275.             if(offset == width) {

  276.                 offset = 0;

  277.                 planep += stride - width;

  278.             }

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

  280.             offset++;

  281.             if(offset == width) {

  282.                 offset = 0;

  283.                 planep += stride - width;

  284.             }

  285.         }

  286.         break;

  287.     case IMODE_DIFF6:

  288.     case IMODE_NORM6:

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

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

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

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

  293.                     if(code < 0){

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

  295.                         return -1;

  296.                     }

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

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

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

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

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

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

  303.                 }

  304.                 planep += stride * 3;

  305.             }

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

  307.         } else { // 3x2

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

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

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

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

  312.                     if(code < 0){

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

  314.                         return -1;

  315.                     }

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

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

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

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

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

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

  322.                 }

  323.                 planep += stride * 2;

  324.             }

  325.             x = width % 3;

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

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

  328.         }

  329.         break;

  330.     case IMODE_ROWSKIP:

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

  332.         break;

  333.     case IMODE_COLSKIP:

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

  335.         break;

  336.     default: break;

  337.     }

  338. 

  339.     /* Applying diff operator */

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

  341.     {

  342.         planep = data;

  343.         planep[0] ^= invert;

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

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

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

  347.         {

  348.             planep += stride;

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

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

  351.             {

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

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

  354.             }

  355.         }

  356.     }

  357.     else if (invert)

  358.     {

  359.         planep = data;

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

  361.     }

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

  363. }

  364. 

  365. /** @} */ //Bitplane group

  366. 

  367. /***********************************************************************/

  368. /** VOP Dquant decoding

  369.  * @param v VC-1 Context

  370.  */

  371. static int vop_dquant_decoding(VC1Context *v)

  372. {

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

  374.     int pqdiff;

  375. 

  376.     //variable size

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

  378.     {

  379.         pqdiff = get_bits(gb, 3);

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

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

  382.     }

  383.     else

  384.     {

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

  386.         if ( v->dquantfrm )

  387.         {

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

  389.             switch (v->dqprofile)

  390.             {

  391.             case DQPROFILE_SINGLE_EDGE:

  392.             case DQPROFILE_DOUBLE_EDGES:

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

  394.                 break;

  395.             case DQPROFILE_ALL_MBS:

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

  397.             default: break; //Forbidden ?

  398.             }

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

  400.             {

  401.                 pqdiff = get_bits(gb, 3);

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

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

  404.             }

  405.         }

  406.     }

  407.     return 0;

  408. }

  409. 

  410. /** Put block onto picture

  411.  */

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

  413. {

  414.     uint8_t *Y;

  415.     int ys, us, vs;

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

  417. 

  418.     if(v->rangeredfrm) {

  419.         int i, j, k;

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

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

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

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

  424. 

  425.     }

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

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

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

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

  430. 

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

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

  433.     Y += ys * 8;

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

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

  436. 

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

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

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

  440.     }

  441. }

  442. 

  443. /** Do motion compensation over 1 macroblock

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

  445.  */

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

  447. {

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

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

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

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

  452. 

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

  454. 

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

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

  457. 

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

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

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

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

  462.     }

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

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

  465.     if(v->fastuvmc) {

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

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

  468.     }

  469.     if(!dir) {

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

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

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

  473.     } else {

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

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

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

  477.     }

  478. 

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

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

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

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

  483. 

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

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

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

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

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

  489.     }else{

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

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

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

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

  494.     }

  495. 

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

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

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

  499. 

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

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

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

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

  504.     }

  505. 

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

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

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

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

  510. 

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

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

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

  514.         srcY = s->edge_emu_buffer;

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

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

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

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

  519.         srcU = uvbuf;

  520.         srcV = uvbuf + 16;

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

  522.         if(v->rangeredfrm) {

  523.             int i, j;

  524.             uint8_t *src, *src2;

  525. 

  526.             src = srcY;

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

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

  529.                 src += s->linesize;

  530.             }

  531.             src = srcU; src2 = srcV;

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

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

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

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

  536.                 }

  537.                 src += s->uvlinesize;

  538.                 src2 += s->uvlinesize;

  539.             }

  540.         }

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

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

  543.             int i, j;

  544.             uint8_t *src, *src2;

  545. 

  546.             src = srcY;

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

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

  549.                 src += s->linesize;

  550.             }

  551.             src = srcU; src2 = srcV;

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

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

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

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

  556.                 }

  557.                 src += s->uvlinesize;

  558.                 src2 += s->uvlinesize;

  559.             }

  560.         }

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

  562.     }

  563. 

  564.     if(s->mspel) {

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

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

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

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

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

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

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

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

  573. 

  574.         if(!v->rnd)

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

  576.         else

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

  578.     }

  579. 

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

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

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

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

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

  585.     if(!v->rnd){

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

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

  588.     }else{

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

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

  591.     }

  592. }

  593. 

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

  595.  */

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

  597. {

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

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

  600.     uint8_t *srcY;

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

  602.     int off;

  603. 

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

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

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

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

  608. 

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

  610. 

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

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

  613. 

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

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

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

  617.     }else{

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

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

  620.     }

  621. 

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

  623. 

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

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

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

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

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

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

  630.         srcY = s->edge_emu_buffer;

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

  632.         if(v->rangeredfrm) {

  633.             int i, j;

  634.             uint8_t *src;

  635. 

  636.             src = srcY;

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

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

  639.                 src += s->linesize;

  640.             }

  641.         }

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

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

  644.             int i, j;

  645.             uint8_t *src;

  646. 

  647.             src = srcY;

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

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

  650.                 src += s->linesize;

  651.             }

  652.         }

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

  654.     }

  655. 

  656.     if(s->mspel) {

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

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

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

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

  661.         if(!v->rnd)

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

  663.         else

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

  665.     }

  666. }

  667. 

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

  669. {

  670.     if(a < b) {

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

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

  673.     } else {

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

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

  676.     }

  677. }

  678. 

  679. 

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

  681.  */

  682. static void vc1_mc_4mv_chroma(VC1Context *v)

  683. {

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

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

  686.     uint8_t *srcU, *srcV;

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

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

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

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

  691. 

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

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

  694. 

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

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

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

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

  699.     }

  700. 

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

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

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

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

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

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

  707.         switch(idx) {

  708.         case 0x1:

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

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

  711.             break;

  712.         case 0x2:

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

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

  715.             break;

  716.         case 0x4:

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

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

  719.             break;

  720.         case 0x8:

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

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

  723.             break;

  724.         }

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

  726.         int t1 = 0, t2 = 0;

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

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

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

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

  731.     } else {

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

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

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

  735.     }

  736. 

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

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

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

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

  741.     if(v->fastuvmc) {

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

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

  744.     }

  745. 

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

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

  748. 

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

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

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

  752.     }else{

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

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

  755.     }

  756. 

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

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

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

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

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

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

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

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

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

  766.         srcU = s->edge_emu_buffer;

  767.         srcV = s->edge_emu_buffer + 16;

  768. 

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

  770.         if(v->rangeredfrm) {

  771.             int i, j;

  772.             uint8_t *src, *src2;

  773. 

  774.             src = srcU; src2 = srcV;

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

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

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

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

  779.                 }

  780.                 src += s->uvlinesize;

  781.                 src2 += s->uvlinesize;

  782.             }

  783.         }

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

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

  786.             int i, j;

  787.             uint8_t *src, *src2;

  788. 

  789.             src = srcU; src2 = srcV;

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

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

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

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

  794.                 }

  795.                 src += s->uvlinesize;

  796.                 src2 += s->uvlinesize;

  797.             }

  798.         }

  799.     }

  800. 

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

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

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

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

  805.     if(!v->rnd){

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

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

  808.     }else{

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

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

  811.     }

  812. }

  813. 

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

  815. 

  816. /**

  817.  * Decode Simple/Main Profiles sequence header

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

  819.  * @param avctx Codec context

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

  821.  * @return Status

  822.  */

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

  824. {

  825.     VC1Context *v = avctx->priv_data;

  826. 

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

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

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

  830.     {

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

  832.     }

  833. 

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

  835.     {

  836.         return decode_sequence_header_adv(v, gb);

  837.     }

  838.     else

  839.     {

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

  841.         if (v->res_sm)

  842.         {

  843.             av_log(avctx, AV_LOG_ERROR,

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

  845.             return -1;

  846.         }

  847.     }

  848. 

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

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

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

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

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

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

  855.     {

  856.         av_log(avctx, AV_LOG_ERROR,

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

  858.     }

  859. 

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

  861.     if (v->res_x8)

  862.     {

  863.         av_log(avctx, AV_LOG_ERROR,

  864.                "1 for reserved RES_X8 is forbidden\n");

  865.         //return -1;

  866.     }

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

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

  869.     if (!v->res_fasttx)

  870.     {

  871.         av_log(avctx, AV_LOG_ERROR,

  872.                "0 for reserved RES_FASTTX is forbidden\n");

  873.         //return -1;

  874.     }

  875. 

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

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

  878.     {

  879.         av_log(avctx, AV_LOG_ERROR,

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

  881.         return -1;

  882.     }

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

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

  885.     {

  886.         av_log(avctx, AV_LOG_ERROR,

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

  888.         return -1;

  889.     }

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

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

  892. 

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

  894.     if (v->res_transtab)

  895.     {

  896.         av_log(avctx, AV_LOG_ERROR,

  897.                "1 for reserved RES_TRANSTAB is forbidden\n");

  898.         return -1;

  899.     }

  900. 

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

  902. 

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

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

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

  906.     {

  907.         av_log(avctx, AV_LOG_INFO,

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

  909.     }

  910. 

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

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

  913. 

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

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

  916.     if (!v->res_rtm_flag)

  917.     {

  918. //            av_log(avctx, AV_LOG_ERROR,

  919. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  920.         av_log(avctx, AV_LOG_ERROR,

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

  922.         //return -1;

  923.     }

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

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

  926.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  935.                );

  936.     return 0;

  937. }

  938. 

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

  940. {

  941.     v->res_rtm_flag = 1;

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

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

  944.     {

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

  946.     }

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

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

  949.     {

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

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

  952.         return -1;

  953.     }

  954. 

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

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

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

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

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

  960. 

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

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

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

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

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

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

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

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

  969.     get_bits1(gb); // reserved

  970. 

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

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

  973. 

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

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

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

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

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

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

  980.                v->tfcntrflag, v->finterpflag

  981.                );

  982. 

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

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

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

  986.         return -1;

  987.     }

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

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

  990.         int w, h, ar = 0;

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

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

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

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

  995.         if(get_bits1(gb))

  996.             ar = get_bits(gb, 4);

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

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

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

  1000.             w = get_bits(gb, 8);

  1001.             h = get_bits(gb, 8);

  1002.             v->s.avctx->sample_aspect_ratio = (AVRational){w, h};

  1003.         }

  1004. 

  1005.         if(get_bits1(gb)){ //framerate stuff

  1006.             if(get_bits1(gb)) {

  1007.                 v->s.avctx->time_base.num = 32;

  1008.                 v->s.avctx->time_base.den = get_bits(gb, 16) + 1;

  1009.             } else {

  1010.                 int nr, dr;

  1011.                 nr = get_bits(gb, 8);

  1012.                 dr = get_bits(gb, 4);

  1013.                 if(nr && nr < 8 && dr && dr < 3){

  1014.                     v->s.avctx->time_base.num = ff_vc1_fps_dr[dr - 1];

  1015.                     v->s.avctx->time_base.den = ff_vc1_fps_nr[nr - 1] * 1000;

  1016.                 }

  1017.             }

  1018.         }

  1019. 

  1020.         if(get_bits1(gb)){

  1021.             v->color_prim = get_bits(gb, 8);

  1022.             v->transfer_char = get_bits(gb, 8);

  1023.             v->matrix_coef = get_bits(gb, 8);

  1024.         }

  1025.     }

  1026. 

  1027.     v->hrd_param_flag = get_bits1(gb);

  1028.     if(v->hrd_param_flag) {

  1029.         int i;

  1030.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  1031.         get_bits(gb, 4); //bitrate exponent

  1032.         get_bits(gb, 4); //buffer size exponent

  1033.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1034.             get_bits(gb, 16); //hrd_rate[n]

  1035.             get_bits(gb, 16); //hrd_buffer[n]

  1036.         }

  1037.     }

  1038.     return 0;

  1039. }

  1040. 

  1041. static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)

  1042. {

  1043.     VC1Context *v = avctx->priv_data;

  1044.     int i, blink, clentry, refdist;

  1045. 

  1046.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  1047.     blink = get_bits1(gb); // broken link

  1048.     clentry = get_bits1(gb); // closed entry

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

  1050.     refdist = get_bits1(gb); // refdist flag

  1051.     v->s.loop_filter = get_bits1(gb);

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

  1053.     v->extended_mv = get_bits1(gb);

  1054.     v->dquant = get_bits(gb, 2);

  1055.     v->vstransform = get_bits1(gb);

  1056.     v->overlap = get_bits1(gb);

  1057.     v->quantizer_mode = get_bits(gb, 2);

  1058. 

  1059.     if(v->hrd_param_flag){

  1060.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1061.             get_bits(gb, 8); //hrd_full[n]

  1062.         }

  1063.     }

  1064. 

  1065.     if(get_bits1(gb)){

  1066.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

  1067.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1068.     }

  1069.     if(v->extended_mv)

  1070.         v->extended_dmv = get_bits1(gb);

  1071.     if(get_bits1(gb)) {

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

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

  1074.     }

  1075.     if(get_bits1(gb)) {

  1076.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1077.         skip_bits(gb, 3); // UV range, ignored for now

  1078.     }

  1079. 

  1080.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1081.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1082.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1083.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1084.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1085.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1086. 

  1087.     return 0;

  1088. }

  1089. 

  1090. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1091. {

  1092.     int pqindex, lowquant, status;

  1093. 

  1094.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1095.     skip_bits(gb, 2); //framecnt unused

  1096.     v->rangeredfrm = 0;

  1097.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1098.     v->s.pict_type = get_bits(gb, 1);

  1099.     if (v->s.avctx->max_b_frames) {

  1100.         if (!v->s.pict_type) {

  1101.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1102.             else v->s.pict_type = B_TYPE;

  1103.         } else v->s.pict_type = P_TYPE;

  1104.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1105. 

  1106.     v->bi_type = 0;

  1107.     if(v->s.pict_type == B_TYPE) {

  1108.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1109.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1110.         if(v->bfraction == 0) {

  1111.             v->s.pict_type = BI_TYPE;

  1112.         }

  1113.     }

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

  1115.         get_bits(gb, 7); // skip buffer fullness

  1116. 

  1117.     /* calculate RND */

  1118.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1119.         v->rnd = 1;

  1120.     if(v->s.pict_type == P_TYPE)

  1121.         v->rnd ^= 1;

  1122. 

  1123.     /* Quantizer stuff */

  1124.     pqindex = get_bits(gb, 5);

  1125.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1126.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1127.     else

  1128.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1129. 

  1130.     v->pquantizer = 1;

  1131.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1132.         v->pquantizer = pqindex < 9;

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

  1134.         v->pquantizer = 0;

  1135.     v->pqindex = pqindex;

  1136.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1137.     else v->halfpq = 0;

  1138.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1139.         v->pquantizer = get_bits(gb, 1);

  1140.     v->dquantfrm = 0;

  1141.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1142.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1143.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1144.     v->range_x = 1 << (v->k_x - 1);

  1145.     v->range_y = 1 << (v->k_y - 1);

  1146.     if (v->profile == PROFILE_ADVANCED)

  1147.     {

  1148.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1149.     }

  1150.     else

  1151.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1152. 

  1153.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1154.         if(get_bits1(gb))return -1;

  1155.     }

  1156. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1157. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1158. 

  1159.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1160. 

  1161.     switch(v->s.pict_type) {

  1162.     case P_TYPE:

  1163.         if (v->pq < 5) v->tt_index = 0;

  1164.         else if(v->pq < 13) v->tt_index = 1;

  1165.         else v->tt_index = 2;

  1166. 

  1167.         lowquant = (v->pq > 12) ? 0 : 1;

  1168.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1169.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1170.         {

  1171.             int scale, shift, i;

  1172.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1173.             v->lumscale = get_bits(gb, 6);

  1174.             v->lumshift = get_bits(gb, 6);

  1175.             v->use_ic = 1;

  1176.             /* fill lookup tables for intensity compensation */

  1177.             if(!v->lumscale) {

  1178.                 scale = -64;

  1179.                 shift = (255 - v->lumshift * 2) << 6;

  1180.                 if(v->lumshift > 31)

  1181.                     shift += 128 << 6;

  1182.             } else {

  1183.                 scale = v->lumscale + 32;

  1184.                 if(v->lumshift > 31)

  1185.                     shift = (v->lumshift - 64) << 6;

  1186.                 else

  1187.                     shift = v->lumshift << 6;

  1188.             }

  1189.             for(i = 0; i < 256; i++) {

  1190.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1191.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1192.             }

  1193.         }

  1194.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1195.             v->s.quarter_sample = 0;

  1196.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1197.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1198.                 v->s.quarter_sample = 0;

  1199.             else

  1200.                 v->s.quarter_sample = 1;

  1201.         } else

  1202.             v->s.quarter_sample = 1;

  1203.         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));

  1204. 

  1205.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1206.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1207.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1208.         {

  1209.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1210.             if (status < 0) return -1;

  1211.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1212.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1213.         } else {

  1214.             v->mv_type_is_raw = 0;

  1215.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1216.         }

  1217.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1218.         if (status < 0) return -1;

  1219.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1220.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1221. 

  1222.         /* Hopefully this is correct for P frames */

  1223.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1224.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1225. 

  1226.         if (v->dquant)

  1227.         {

  1228.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1229.             vop_dquant_decoding(v);

  1230.         }

  1231. 

  1232.         v->ttfrm = 0; //FIXME Is that so ?

  1233.         if (v->vstransform)

  1234.         {

  1235.             v->ttmbf = get_bits(gb, 1);

  1236.             if (v->ttmbf)

  1237.             {

  1238.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1239.             }

  1240.         } else {

  1241.             v->ttmbf = 1;

  1242.             v->ttfrm = TT_8X8;

  1243.         }

  1244.         break;

  1245.     case B_TYPE:

  1246.         if (v->pq < 5) v->tt_index = 0;

  1247.         else if(v->pq < 13) v->tt_index = 1;

  1248.         else v->tt_index = 2;

  1249. 

  1250.         lowquant = (v->pq > 12) ? 0 : 1;

  1251.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1252.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1253.         v->s.mspel = v->s.quarter_sample;

  1254. 

  1255.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

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

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

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

  1259.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1260.         if (status < 0) return -1;

  1261.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1262.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1263. 

  1264.         v->s.mv_table_index = get_bits(gb, 2);

  1265.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1266. 

  1267.         if (v->dquant)

  1268.         {

  1269.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1270.             vop_dquant_decoding(v);

  1271.         }

  1272. 

  1273.         v->ttfrm = 0;

  1274.         if (v->vstransform)

  1275.         {

  1276.             v->ttmbf = get_bits(gb, 1);

  1277.             if (v->ttmbf)

  1278.             {

  1279.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1280.             }

  1281.         } else {

  1282.             v->ttmbf = 1;

  1283.             v->ttfrm = TT_8X8;

  1284.         }

  1285.         break;

  1286.     }

  1287. 

  1288.     /* AC Syntax */

  1289.     v->c_ac_table_index = decode012(gb);

  1290.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1291.     {

  1292.         v->y_ac_table_index = decode012(gb);

  1293.     }

  1294.     /* DC Syntax */

  1295.     v->s.dc_table_index = get_bits(gb, 1);

  1296. 

  1297.     if(v->s.pict_type == BI_TYPE) {

  1298.         v->s.pict_type = B_TYPE;

  1299.         v->bi_type = 1;

  1300.     }

  1301.     return 0;

  1302. }

  1303. 

  1304. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1305. {

  1306.     int pqindex, lowquant;

  1307.     int status;

  1308. 

  1309.     v->p_frame_skipped = 0;

  1310. 

  1311.     if(v->interlace){

  1312.         v->fcm = decode012(gb);

  1313.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1314.     }

  1315.     switch(get_prefix(gb, 0, 4)) {

  1316.     case 0:

  1317.         v->s.pict_type = P_TYPE;

  1318.         break;

  1319.     case 1:

  1320.         v->s.pict_type = B_TYPE;

  1321.         break;

  1322.     case 2:

  1323.         v->s.pict_type = I_TYPE;

  1324.         break;

  1325.     case 3:

  1326.         v->s.pict_type = BI_TYPE;

  1327.         break;

  1328.     case 4:

  1329.         v->s.pict_type = P_TYPE; // skipped pic

  1330.         v->p_frame_skipped = 1;

  1331.         return 0;

  1332.     }

  1333.     if(v->tfcntrflag)

  1334.         get_bits(gb, 8);

  1335.     if(v->broadcast) {

  1336.         if(!v->interlace || v->psf) {

  1337.             v->rptfrm = get_bits(gb, 2);

  1338.         } else {

  1339.             v->tff = get_bits1(gb);

  1340.             v->rptfrm = get_bits1(gb);

  1341.         }

  1342.     }

  1343.     if(v->panscanflag) {

  1344.         //...

  1345.     }

  1346.     v->rnd = get_bits1(gb);

  1347.     if(v->interlace)

  1348.         v->uvsamp = get_bits1(gb);

  1349.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1350.     if(v->s.pict_type == B_TYPE) {

  1351.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1352.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1353.         if(v->bfraction == 0) {

  1354.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1355.         }

  1356.     }

  1357.     pqindex = get_bits(gb, 5);

  1358.     v->pqindex = pqindex;

  1359.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1360.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1361.     else

  1362.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1363. 

  1364.     v->pquantizer = 1;

  1365.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1366.         v->pquantizer = pqindex < 9;

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

  1368.         v->pquantizer = 0;

  1369.     v->pqindex = pqindex;

  1370.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1371.     else v->halfpq = 0;

  1372.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1373.         v->pquantizer = get_bits(gb, 1);

  1374. 

  1375.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1376. 

  1377.     switch(v->s.pict_type) {

  1378.     case I_TYPE:

  1379.     case BI_TYPE:

  1380.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1381.         if (status < 0) return -1;

  1382.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1383.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1384.         v->condover = CONDOVER_NONE;

  1385.         if(v->overlap && v->pq <= 8) {

  1386.             v->condover = decode012(gb);

  1387.             if(v->condover == CONDOVER_SELECT) {

  1388.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1389.                 if (status < 0) return -1;

  1390.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1391.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1392.             }

  1393.         }

  1394.         break;

  1395.     case P_TYPE:

  1396.         if(v->postprocflag)

  1397.             v->postproc = get_bits1(gb);

  1398.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1399.         else v->mvrange = 0;

  1400.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1401.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1402.         v->range_x = 1 << (v->k_x - 1);

  1403.         v->range_y = 1 << (v->k_y - 1);

  1404. 

  1405.         if (v->pq < 5) v->tt_index = 0;

  1406.         else if(v->pq < 13) v->tt_index = 1;

  1407.         else v->tt_index = 2;

  1408. 

  1409.         lowquant = (v->pq > 12) ? 0 : 1;

  1410.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1411.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1412.         {

  1413.             int scale, shift, i;

  1414.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1415.             v->lumscale = get_bits(gb, 6);

  1416.             v->lumshift = get_bits(gb, 6);

  1417.             /* fill lookup tables for intensity compensation */

  1418.             if(!v->lumscale) {

  1419.                 scale = -64;

  1420.                 shift = (255 - v->lumshift * 2) << 6;

  1421.                 if(v->lumshift > 31)

  1422.                     shift += 128 << 6;

  1423.             } else {

  1424.                 scale = v->lumscale + 32;

  1425.                 if(v->lumshift > 31)

  1426.                     shift = (v->lumshift - 64) << 6;

  1427.                 else

  1428.                     shift = v->lumshift << 6;

  1429.             }

  1430.             for(i = 0; i < 256; i++) {

  1431.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1432.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1433.             }

  1434.             v->use_ic = 1;

  1435.         }

  1436.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1437.             v->s.quarter_sample = 0;

  1438.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1439.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1440.                 v->s.quarter_sample = 0;

  1441.             else

  1442.                 v->s.quarter_sample = 1;

  1443.         } else

  1444.             v->s.quarter_sample = 1;

  1445.         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));

  1446. 

  1447.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1448.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1449.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1450.         {

  1451.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1452.             if (status < 0) return -1;

  1453.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1454.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1455.         } else {

  1456.             v->mv_type_is_raw = 0;

  1457.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1458.         }

  1459.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1460.         if (status < 0) return -1;

  1461.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1462.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1463. 

  1464.         /* Hopefully this is correct for P frames */

  1465.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1466.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1467.         if (v->dquant)

  1468.         {

  1469.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1470.             vop_dquant_decoding(v);

  1471.         }

  1472. 

  1473.         v->ttfrm = 0; //FIXME Is that so ?

  1474.         if (v->vstransform)

  1475.         {

  1476.             v->ttmbf = get_bits(gb, 1);

  1477.             if (v->ttmbf)

  1478.             {

  1479.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1480.             }

  1481.         } else {

  1482.             v->ttmbf = 1;

  1483.             v->ttfrm = TT_8X8;

  1484.         }

  1485.         break;

  1486.     case B_TYPE:

  1487.         if(v->postprocflag)

  1488.             v->postproc = get_bits1(gb);

  1489.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1490.         else v->mvrange = 0;

  1491.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1492.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1493.         v->range_x = 1 << (v->k_x - 1);

  1494.         v->range_y = 1 << (v->k_y - 1);

  1495. 

  1496.         if (v->pq < 5) v->tt_index = 0;

  1497.         else if(v->pq < 13) v->tt_index = 1;

  1498.         else v->tt_index = 2;

  1499. 

  1500.         lowquant = (v->pq > 12) ? 0 : 1;

  1501.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1502.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1503.         v->s.mspel = v->s.quarter_sample;

  1504. 

  1505.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

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

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

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

  1509.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1510.         if (status < 0) return -1;

  1511.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1512.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1513. 

  1514.         v->s.mv_table_index = get_bits(gb, 2);

  1515.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1516. 

  1517.         if (v->dquant)

  1518.         {

  1519.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1520.             vop_dquant_decoding(v);

  1521.         }

  1522. 

  1523.         v->ttfrm = 0;

  1524.         if (v->vstransform)

  1525.         {

  1526.             v->ttmbf = get_bits(gb, 1);

  1527.             if (v->ttmbf)

  1528.             {

  1529.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1530.             }

  1531.         } else {

  1532.             v->ttmbf = 1;

  1533.             v->ttfrm = TT_8X8;

  1534.         }

  1535.         break;

  1536.     }

  1537. 

  1538.     /* AC Syntax */

  1539.     v->c_ac_table_index = decode012(gb);

  1540.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1541.     {

  1542.         v->y_ac_table_index = decode012(gb);

  1543.     }

  1544.     /* DC Syntax */

  1545.     v->s.dc_table_index = get_bits(gb, 1);

  1546.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1547.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1548.         vop_dquant_decoding(v);

  1549.     }

  1550. 

  1551.     v->bi_type = 0;

  1552.     if(v->s.pict_type == BI_TYPE) {

  1553.         v->s.pict_type = B_TYPE;

  1554.         v->bi_type = 1;

  1555.     }

  1556.     return 0;

  1557. }

  1558. 

  1559. /***********************************************************************/

  1560. /**

  1561.  * @defgroup block VC-1 Block-level functions

  1562.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1563.  * @{

  1564.  */

  1565. 

  1566. /**

  1567.  * @def GET_MQUANT

  1568.  * @brief Get macroblock-level quantizer scale

  1569.  */

  1570. #define GET_MQUANT()                                           \

  1571.   if (v->dquantfrm)                                            \

  1572.   {                                                            \

  1573.     int edges = 0;                                             \

  1574.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1575.     {                                                          \

  1576.       if (v->dqbilevel)                                        \

  1577.       {                                                        \

  1578.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1579.       }                                                        \

  1580.       else                                                     \

  1581.       {                                                        \

  1582.         mqdiff = get_bits(gb, 3);                              \

  1583.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1584.         else mquant = get_bits(gb, 5);                         \

  1585.       }                                                        \

  1586.     }                                                          \

  1587.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1588.         edges = 1 << v->dqsbedge;                              \

  1589.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1590.         edges = (3 << v->dqsbedge) % 15;                       \

  1591.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1592.         edges = 15;                                            \

  1593.     if((edges&1) && !s->mb_x)                                  \

  1594.         mquant = v->altpq;                                     \

  1595.     if((edges&2) && s->first_slice_line)                       \

  1596.         mquant = v->altpq;                                     \

  1597.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1598.         mquant = v->altpq;                                     \

  1599.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1600.         mquant = v->altpq;                                     \

  1601.   }

  1602. 

  1603. /**

  1604.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1605.  * @brief Get MV differentials

  1606.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1607.  * @param _dmv_x Horizontal differential for decoded MV

  1608.  * @param _dmv_y Vertical differential for decoded MV

  1609.  */

  1610. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1611.   index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table,\

  1612.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1613.   if (index > 36)                                                   \

  1614.   {                                                                 \

  1615.     mb_has_coeffs = 1;                                              \

  1616.     index -= 37;                                                    \

  1617.   }                                                                 \

  1618.   else mb_has_coeffs = 0;                                           \

  1619.   s->mb_intra = 0;                                                  \

  1620.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1621.   else if (index == 35)                                             \

  1622.   {                                                                 \

  1623.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1624.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1625.   }                                                                 \

  1626.   else if (index == 36)                                             \

  1627.   {                                                                 \

  1628.     _dmv_x = 0;                                                     \

  1629.     _dmv_y = 0;                                                     \

  1630.     s->mb_intra = 1;                                                \

  1631.   }                                                                 \

  1632.   else                                                              \

  1633.   {                                                                 \

  1634.     index1 = index%6;                                               \

  1635.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1636.     else                                   val = 0;                 \

  1637.     if(size_table[index1] - val > 0)                                \

  1638.         val = get_bits(gb, size_table[index1] - val);               \

  1639.     else                                   val = 0;                 \

  1640.     sign = 0 - (val&1);                                             \

  1641.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1642.                                                                     \

  1643.     index1 = index/6;                                               \

  1644.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1645.     else                                   val = 0;                 \

  1646.     if(size_table[index1] - val > 0)                                \

  1647.         val = get_bits(gb, size_table[index1] - val);               \

  1648.     else                                   val = 0;                 \

  1649.     sign = 0 - (val&1);                                             \

  1650.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1651.   }

  1652. 

  1653. /** Predict and set motion vector

  1654.  */

  1655. 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)

  1656. {

  1657.     int xy, wrap, off = 0;

  1658.     int16_t *A, *B, *C;

  1659.     int px, py;

  1660.     int sum;

  1661. 

  1662.     /* scale MV difference to be quad-pel */

  1663.     dmv_x <<= 1 - s->quarter_sample;

  1664.     dmv_y <<= 1 - s->quarter_sample;

  1665. 

  1666.     wrap = s->b8_stride;

  1667.     xy = s->block_index[n];

  1668. 

  1669.     if(s->mb_intra){

  1670.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

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

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

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

  1674.         if(mv1) { /* duplicate motion data for 1-MV block */

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

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

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

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

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

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

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

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

  1683.             s->current_picture.motion_val[1][xy + wrap][0] = 0;

  1684.             s->current_picture.motion_val[1][xy + wrap][1] = 0;

  1685.             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;

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

  1687.         }

  1688.         return;

  1689.     }

  1690. 

  1691.     C = s->current_picture.motion_val[0][xy - 1];

  1692.     A = s->current_picture.motion_val[0][xy - wrap];

  1693.     if(mv1)

  1694.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1695.     else {

  1696.         //in 4-MV mode different blocks have different B predictor position

  1697.         switch(n){

  1698.         case 0:

  1699.             off = (s->mb_x > 0) ? -1 : 1;

  1700.             break;

  1701.         case 1:

  1702.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1703.             break;

  1704.         case 2:

  1705.             off = 1;

  1706.             break;

  1707.         case 3:

  1708.             off = -1;

  1709.         }

  1710.     }

  1711.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1712. 

  1713.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1714.         if(s->mb_width == 1) {

  1715.             px = A[0];

  1716.             py = A[1];

  1717.         } else {

  1718.             px = mid_pred(A[0], B[0], C[0]);

  1719.             py = mid_pred(A[1], B[1], C[1]);

  1720.         }

  1721.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1722.         px = C[0];

  1723.         py = C[1];

  1724.     } else {

  1725.         px = py = 0;

  1726.     }

  1727.     /* Pullback MV as specified in 8.3.5.3.4 */

  1728.     {

  1729.         int qx, qy, X, Y;

  1730.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1731.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1732.         X = (s->mb_width << 6) - 4;

  1733.         Y = (s->mb_height << 6) - 4;

  1734.         if(mv1) {

  1735.             if(qx + px < -60) px = -60 - qx;

  1736.             if(qy + py < -60) py = -60 - qy;

  1737.         } else {

  1738.             if(qx + px < -28) px = -28 - qx;

  1739.             if(qy + py < -28) py = -28 - qy;

  1740.         }

  1741.         if(qx + px > X) px = X - qx;

  1742.         if(qy + py > Y) py = Y - qy;

  1743.     }

  1744.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1745.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1746.         if(is_intra[xy - wrap])

  1747.             sum = FFABS(px) + FFABS(py);

  1748.         else

  1749.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1750.         if(sum > 32) {

  1751.             if(get_bits1(&s->gb)) {

  1752.                 px = A[0];

  1753.                 py = A[1];

  1754.             } else {

  1755.                 px = C[0];

  1756.                 py = C[1];

  1757.             }

  1758.         } else {

  1759.             if(is_intra[xy - 1])

  1760.                 sum = FFABS(px) + FFABS(py);

  1761.             else

  1762.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1763.             if(sum > 32) {

  1764.                 if(get_bits1(&s->gb)) {

  1765.                     px = A[0];

  1766.                     py = A[1];

  1767.                 } else {

  1768.                     px = C[0];

  1769.                     py = C[1];

  1770.                 }

  1771.             }

  1772.         }

  1773.     }

  1774.     /* store MV using signed modulus of MV range defined in 4.11 */

  1775.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1776.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1777.     if(mv1) { /* duplicate motion data for 1-MV block */

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

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

  1780.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1781.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1782.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1783.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1784.     }

  1785. }

  1786. 

  1787. /** Motion compensation for direct or interpolated blocks in B-frames

  1788.  */

  1789. static void vc1_interp_mc(VC1Context *v)

  1790. {

  1791.     MpegEncContext *s = &v->s;

  1792.     DSPContext *dsp = &v->s.dsp;

  1793.     uint8_t *srcY, *srcU, *srcV;

  1794.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1795. 

  1796.     if(!v->s.next_picture.data[0])return;

  1797. 

  1798.     mx = s->mv[1][0][0];

  1799.     my = s->mv[1][0][1];

  1800.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1801.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1802.     if(v->fastuvmc) {

  1803.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  1804.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  1805.     }

  1806.     srcY = s->next_picture.data[0];

  1807.     srcU = s->next_picture.data[1];

  1808.     srcV = s->next_picture.data[2];

  1809. 

  1810.     src_x = s->mb_x * 16 + (mx >> 2);

  1811.     src_y = s->mb_y * 16 + (my >> 2);

  1812.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1813.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1814. 

  1815.     if(v->profile != PROFILE_ADVANCED){

  1816.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1817.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1818.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1819.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1820.     }else{

  1821.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1822.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1823.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1824.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1825.     }

  1826. 

  1827.     srcY += src_y * s->linesize + src_x;

  1828.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1829.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1830. 

  1831.     /* for grayscale we should not try to read from unknown area */

  1832.     if(s->flags & CODEC_FLAG_GRAY) {

  1833.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1834.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1835.     }

  1836. 

  1837.     if(v->rangeredfrm

  1838.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1839.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1840.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1841. 

  1842.         srcY -= s->mspel * (1 + s->linesize);

  1843.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  1844.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1845.         srcY = s->edge_emu_buffer;

  1846.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1847.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1848.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1849.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1850.         srcU = uvbuf;

  1851.         srcV = uvbuf + 16;

  1852.         /* if we deal with range reduction we need to scale source blocks */

  1853.         if(v->rangeredfrm) {

  1854.             int i, j;

  1855.             uint8_t *src, *src2;

  1856. 

  1857.             src = srcY;

  1858.             for(j = 0; j < 17 + s->mspel*2; j++) {

  1859.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1860.                 src += s->linesize;

  1861.             }

  1862.             src = srcU; src2 = srcV;

  1863.             for(j = 0; j < 9; j++) {

  1864.                 for(i = 0; i < 9; i++) {

  1865.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1866.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1867.                 }

  1868.                 src += s->uvlinesize;

  1869.                 src2 += s->uvlinesize;

  1870.             }

  1871.         }

  1872.         srcY += s->mspel * (1 + s->linesize);

  1873.     }

  1874. 

  1875.     mx >>= 1;

  1876.     my >>= 1;

  1877.     dxy = ((my & 1) << 1) | (mx & 1);

  1878. 

  1879.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1880. 

  1881.     if(s->flags & CODEC_FLAG_GRAY) return;

  1882.     /* Chroma MC always uses qpel blilinear */

  1883.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1884.     uvmx = (uvmx&3)<<1;

  1885.     uvmy = (uvmy&3)<<1;

  1886.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1887.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1888. }

  1889. 

  1890. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1891. {

  1892.     int n = bfrac;

  1893. 

  1894. #if B_FRACTION_DEN==256

  1895.     if(inv)

  1896.         n -= 256;

  1897.     if(!qs)

  1898.         return 2 * ((value * n + 255) >> 9);

  1899.     return (value * n + 128) >> 8;

  1900. #else

  1901.     if(inv)

  1902.         n -= B_FRACTION_DEN;

  1903.     if(!qs)

  1904.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1905.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1906. #endif

  1907. }

  1908. 

  1909. /** Reconstruct motion vector for B-frame and do motion compensation

  1910.  */

  1911. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1912. {

  1913.     if(v->use_ic) {

  1914.         v->mv_mode2 = v->mv_mode;

  1915.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  1916.     }

  1917.     if(direct) {

  1918.         vc1_mc_1mv(v, 0);

  1919.         vc1_interp_mc(v);

  1920.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1921.         return;

  1922.     }

  1923.     if(mode == BMV_TYPE_INTERPOLATED) {

  1924.         vc1_mc_1mv(v, 0);

  1925.         vc1_interp_mc(v);

  1926.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1927.         return;

  1928.     }

  1929. 

  1930.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  1931.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  1932.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  1933. }

  1934. 

  1935. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  1936. {

  1937.     MpegEncContext *s = &v->s;

  1938.     int xy, wrap, off = 0;

  1939.     int16_t *A, *B, *C;

  1940.     int px, py;

  1941.     int sum;

  1942.     int r_x, r_y;

  1943.     const uint8_t *is_intra = v->mb_type[0];

  1944. 

  1945.     r_x = v->range_x;

  1946.     r_y = v->range_y;

  1947.     /* scale MV difference to be quad-pel */

  1948.     dmv_x[0] <<= 1 - s->quarter_sample;

  1949.     dmv_y[0] <<= 1 - s->quarter_sample;

  1950.     dmv_x[1] <<= 1 - s->quarter_sample;

  1951.     dmv_y[1] <<= 1 - s->quarter_sample;

  1952. 

  1953.     wrap = s->b8_stride;

  1954.     xy = s->block_index[0];

  1955. 

  1956.     if(s->mb_intra) {

  1957.         s->current_picture.motion_val[0][xy][0] =

  1958.         s->current_picture.motion_val[0][xy][1] =

  1959.         s->current_picture.motion_val[1][xy][0] =

  1960.         s->current_picture.motion_val[1][xy][1] = 0;

  1961.         return;

  1962.     }

  1963.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  1964.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  1965.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  1966.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  1967. 

  1968.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  1969.     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));

  1970.     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));

  1971.     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));

  1972.     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));

  1973.     if(direct) {

  1974.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  1975.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  1976.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  1977.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  1978.         return;

  1979.     }

  1980. 

  1981.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  1982.         C = s->current_picture.motion_val[0][xy - 2];

  1983.         A = s->current_picture.motion_val[0][xy - wrap*2];

  1984.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1985.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  1986. 

  1987.         if(!s->mb_x) C[0] = C[1] = 0;

  1988.         if(!s->first_slice_line) { // predictor A is not out of bounds

  1989.             if(s->mb_width == 1) {

  1990.                 px = A[0];

  1991.                 py = A[1];

  1992.             } else {

  1993.                 px = mid_pred(A[0], B[0], C[0]);

  1994.                 py = mid_pred(A[1], B[1], C[1]);

  1995.             }

  1996.         } else if(s->mb_x) { // predictor C is not out of bounds

  1997.             px = C[0];

  1998.             py = C[1];

  1999.         } else {

  2000.             px = py = 0;

  2001.         }

  2002.         /* Pullback MV as specified in 8.3.5.3.4 */

  2003.         {

  2004.             int qx, qy, X, Y;

  2005.             if(v->profile < PROFILE_ADVANCED) {

  2006.                 qx = (s->mb_x << 5);

  2007.                 qy = (s->mb_y << 5);

  2008.                 X = (s->mb_width << 5) - 4;

  2009.                 Y = (s->mb_height << 5) - 4;

  2010.                 if(qx + px < -28) px = -28 - qx;

  2011.                 if(qy + py < -28) py = -28 - qy;

  2012.                 if(qx + px > X) px = X - qx;

  2013.                 if(qy + py > Y) py = Y - qy;

  2014.             } else {

  2015.                 qx = (s->mb_x << 6);

  2016.                 qy = (s->mb_y << 6);

  2017.                 X = (s->mb_width << 6) - 4;

  2018.                 Y = (s->mb_height << 6) - 4;

  2019.                 if(qx + px < -60) px = -60 - qx;

  2020.                 if(qy + py < -60) py = -60 - qy;

  2021.                 if(qx + px > X) px = X - qx;

  2022.                 if(qy + py > Y) py = Y - qy;

  2023.             }

  2024.         }

  2025.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2026.         if(0 && !s->first_slice_line && s->mb_x) {

  2027.             if(is_intra[xy - wrap])

  2028.                 sum = FFABS(px) + FFABS(py);

  2029.             else

  2030.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2031.             if(sum > 32) {

  2032.                 if(get_bits1(&s->gb)) {

  2033.                     px = A[0];

  2034.                     py = A[1];

  2035.                 } else {

  2036.                     px = C[0];

  2037.                     py = C[1];

  2038.                 }

  2039.             } else {

  2040.                 if(is_intra[xy - 2])

  2041.                     sum = FFABS(px) + FFABS(py);

  2042.                 else

  2043.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2044.                 if(sum > 32) {

  2045.                     if(get_bits1(&s->gb)) {

  2046.                         px = A[0];

  2047.                         py = A[1];

  2048.                     } else {

  2049.                         px = C[0];

  2050.                         py = C[1];

  2051.                     }

  2052.                 }

  2053.             }

  2054.         }

  2055.         /* store MV using signed modulus of MV range defined in 4.11 */

  2056.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2057.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2058.     }

  2059.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2060.         C = s->current_picture.motion_val[1][xy - 2];

  2061.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2062.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2063.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2064. 

  2065.         if(!s->mb_x) C[0] = C[1] = 0;

  2066.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2067.             if(s->mb_width == 1) {

  2068.                 px = A[0];

  2069.                 py = A[1];

  2070.             } else {

  2071.                 px = mid_pred(A[0], B[0], C[0]);

  2072.                 py = mid_pred(A[1], B[1], C[1]);

  2073.             }

  2074.         } else if(s->mb_x) { // predictor C is not out of bounds

  2075.             px = C[0];

  2076.             py = C[1];

  2077.         } else {

  2078.             px = py = 0;

  2079.         }

  2080.         /* Pullback MV as specified in 8.3.5.3.4 */

  2081.         {

  2082.             int qx, qy, X, Y;

  2083.             if(v->profile < PROFILE_ADVANCED) {

  2084.                 qx = (s->mb_x << 5);

  2085.                 qy = (s->mb_y << 5);

  2086.                 X = (s->mb_width << 5) - 4;

  2087.                 Y = (s->mb_height << 5) - 4;

  2088.                 if(qx + px < -28) px = -28 - qx;

  2089.                 if(qy + py < -28) py = -28 - qy;

  2090.                 if(qx + px > X) px = X - qx;

  2091.                 if(qy + py > Y) py = Y - qy;

  2092.             } else {

  2093.                 qx = (s->mb_x << 6);

  2094.                 qy = (s->mb_y << 6);

  2095.                 X = (s->mb_width << 6) - 4;

  2096.                 Y = (s->mb_height << 6) - 4;

  2097.                 if(qx + px < -60) px = -60 - qx;

  2098.                 if(qy + py < -60) py = -60 - qy;

  2099.                 if(qx + px > X) px = X - qx;

  2100.                 if(qy + py > Y) py = Y - qy;

  2101.             }

  2102.         }

  2103.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2104.         if(0 && !s->first_slice_line && s->mb_x) {

  2105.             if(is_intra[xy - wrap])

  2106.                 sum = FFABS(px) + FFABS(py);

  2107.             else

  2108.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2109.             if(sum > 32) {

  2110.                 if(get_bits1(&s->gb)) {

  2111.                     px = A[0];

  2112.                     py = A[1];

  2113.                 } else {

  2114.                     px = C[0];

  2115.                     py = C[1];

  2116.                 }

  2117.             } else {

  2118.                 if(is_intra[xy - 2])

  2119.                     sum = FFABS(px) + FFABS(py);

  2120.                 else

  2121.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2122.                 if(sum > 32) {

  2123.                     if(get_bits1(&s->gb)) {

  2124.                         px = A[0];

  2125.                         py = A[1];

  2126.                     } else {

  2127.                         px = C[0];

  2128.                         py = C[1];

  2129.                     }

  2130.                 }

  2131.             }

  2132.         }

  2133.         /* store MV using signed modulus of MV range defined in 4.11 */

  2134. 

  2135.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2136.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2137.     }

  2138.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2139.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2140.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2141.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2142. }

  2143. 

  2144. /** Get predicted DC value for I-frames only

  2145.  * prediction dir: left=0, top=1

  2146.  * @param s MpegEncContext

  2147.  * @param[in] n block index in the current MB

  2148.  * @param dc_val_ptr Pointer to DC predictor

  2149.  * @param dir_ptr Prediction direction for use in AC prediction

  2150.  */

  2151. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2152.                               int16_t **dc_val_ptr, int *dir_ptr)

  2153. {

  2154.     int a, b, c, wrap, pred, scale;

  2155.     int16_t *dc_val;

  2156.     static const uint16_t dcpred[32] = {

  2157.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2158.          114,  102,   93,   85,   79,   73,   68,   64,

  2159.           60,   57,   54,   51,   49,   47,   45,   43,

  2160.           41,   39,   38,   37,   35,   34,   33

  2161.     };

  2162. 

  2163.     /* find prediction - wmv3_dc_scale always used here in fact */

  2164.     if (n < 4)     scale = s->y_dc_scale;

  2165.     else           scale = s->c_dc_scale;

  2166. 

  2167.     wrap = s->block_wrap[n];

  2168.     dc_val= s->dc_val[0] + s->block_index[n];

  2169. 

  2170.     /* B A

  2171.      * C X

  2172.      */

  2173.     c = dc_val[ - 1];

  2174.     b = dc_val[ - 1 - wrap];

  2175.     a = dc_val[ - wrap];

  2176. 

  2177.     if (pq < 9 || !overlap)

  2178.     {

  2179.         /* Set outer values */

  2180.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2181.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2182.     }

  2183.     else

  2184.     {

  2185.         /* Set outer values */

  2186.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2187.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2188.     }

  2189. 

  2190.     if (abs(a - b) <= abs(b - c)) {

  2191.         pred = c;

  2192.         *dir_ptr = 1;//left

  2193.     } else {

  2194.         pred = a;

  2195.         *dir_ptr = 0;//top

  2196.     }

  2197. 

  2198.     /* update predictor */

  2199.     *dc_val_ptr = &dc_val[0];

  2200.     return pred;

  2201. }

  2202. 

  2203. 

  2204. /** Get predicted DC value

  2205.  * prediction dir: left=0, top=1

  2206.  * @param s MpegEncContext

  2207.  * @param[in] n block index in the current MB

  2208.  * @param dc_val_ptr Pointer to DC predictor

  2209.  * @param dir_ptr Prediction direction for use in AC prediction

  2210.  */

  2211. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2212.                               int a_avail, int c_avail,

  2213.                               int16_t **dc_val_ptr, int *dir_ptr)

  2214. {

  2215.     int a, b, c, wrap, pred, scale;

  2216.     int16_t *dc_val;

  2217.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2218.     int q1, q2 = 0;

  2219. 

  2220.     /* find prediction - wmv3_dc_scale always used here in fact */

  2221.     if (n < 4)     scale = s->y_dc_scale;

  2222.     else           scale = s->c_dc_scale;

  2223. 

  2224.     wrap = s->block_wrap[n];

  2225.     dc_val= s->dc_val[0] + s->block_index[n];

  2226. 

  2227.     /* B A

  2228.      * C X

  2229.      */

  2230.     c = dc_val[ - 1];

  2231.     b = dc_val[ - 1 - wrap];

  2232.     a = dc_val[ - wrap];

  2233.     /* scale predictors if needed */

  2234.     q1 = s->current_picture.qscale_table[mb_pos];

  2235.     if(c_avail && (n!= 1 && n!=3)) {

  2236.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2237.         if(q2 && q2 != q1)

  2238.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2239.     }

  2240.     if(a_avail && (n!= 2 && n!=3)) {

  2241.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2242.         if(q2 && q2 != q1)

  2243.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2244.     }

  2245.     if(a_avail && c_avail && (n!=3)) {

  2246.         int off = mb_pos;

  2247.         if(n != 1) off--;

  2248.         if(n != 2) off -= s->mb_stride;

  2249.         q2 = s->current_picture.qscale_table[off];

  2250.         if(q2 && q2 != q1)

  2251.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2252.     }

  2253. 

  2254.     if(a_avail && c_avail) {

  2255.         if(abs(a - b) <= abs(b - c)) {

  2256.             pred = c;

  2257.             *dir_ptr = 1;//left

  2258.         } else {

  2259.             pred = a;

  2260.             *dir_ptr = 0;//top

  2261.         }

  2262.     } else if(a_avail) {

  2263.         pred = a;

  2264.         *dir_ptr = 0;//top

  2265.     } else if(c_avail) {

  2266.         pred = c;

  2267.         *dir_ptr = 1;//left

  2268.     } else {

  2269.         pred = 0;

  2270.         *dir_ptr = 1;//left

  2271.     }

  2272. 

  2273.     /* update predictor */

  2274.     *dc_val_ptr = &dc_val[0];

  2275.     return pred;

  2276. }

  2277. 

  2278. 

  2279. /**

  2280.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2281.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2282.  * @{

  2283.  */

  2284. 

  2285. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2286. {

  2287.     int xy, wrap, pred, a, b, c;

  2288. 

  2289.     xy = s->block_index[n];

  2290.     wrap = s->b8_stride;

  2291. 

  2292.     /* B C

  2293.      * A X

  2294.      */

  2295.     a = s->coded_block[xy - 1       ];

  2296.     b = s->coded_block[xy - 1 - wrap];

  2297.     c = s->coded_block[xy     - wrap];

  2298. 

  2299.     if (b == c) {

  2300.         pred = a;

  2301.     } else {

  2302.         pred = c;

  2303.     }

  2304. 

  2305.     /* store value */

  2306.     *coded_block_ptr = &s->coded_block[xy];

  2307. 

  2308.     return pred;

  2309. }

  2310. 

  2311. /**

  2312.  * Decode one AC coefficient

  2313.  * @param v The VC1 context

  2314.  * @param last Last coefficient

  2315.  * @param skip How much zero coefficients to skip

  2316.  * @param value Decoded AC coefficient value

  2317.  * @see 8.1.3.4

  2318.  */

  2319. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2320. {

  2321.     GetBitContext *gb = &v->s.gb;

  2322.     int index, escape, run = 0, level = 0, lst = 0;

  2323. 

  2324.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2325.     if (index != vc1_ac_sizes[codingset] - 1) {

  2326.         run = vc1_index_decode_table[codingset][index][0];

  2327.         level = vc1_index_decode_table[codingset][index][1];

  2328.         lst = index >= vc1_last_decode_table[codingset];

  2329.         if(get_bits(gb, 1))

  2330.             level = -level;

  2331.     } else {

  2332.         escape = decode210(gb);

  2333.         if (escape != 2) {

  2334.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2335.             run = vc1_index_decode_table[codingset][index][0];

  2336.             level = vc1_index_decode_table[codingset][index][1];

  2337.             lst = index >= vc1_last_decode_table[codingset];

  2338.             if(escape == 0) {

  2339.                 if(lst)

  2340.                     level += vc1_last_delta_level_table[codingset][run];

  2341.                 else

  2342.                     level += vc1_delta_level_table[codingset][run];

  2343.             } else {

  2344.                 if(lst)

  2345.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2346.                 else

  2347.                     run += vc1_delta_run_table[codingset][level] + 1;

  2348.             }

  2349.             if(get_bits(gb, 1))

  2350.                 level = -level;

  2351.         } else {

  2352.             int sign;

  2353.             lst = get_bits(gb, 1);

  2354.             if(v->s.esc3_level_length == 0) {

  2355.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2356.                     v->s.esc3_level_length = get_bits(gb, 3);

  2357.                     if(!v->s.esc3_level_length)

  2358.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2359.                 } else { //table 60

  2360.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2361.                 }

  2362.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2363.             }

  2364.             run = get_bits(gb, v->s.esc3_run_length);

  2365.             sign = get_bits(gb, 1);

  2366.             level = get_bits(gb, v->s.esc3_level_length);

  2367.             if(sign)

  2368.                 level = -level;

  2369.         }

  2370.     }

  2371. 

  2372.     *last = lst;

  2373.     *skip = run;

  2374.     *value = level;

  2375. }

  2376. 

  2377. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2378.  * @param v VC1Context

  2379.  * @param block block to decode

  2380.  * @param coded are AC coeffs present or not

  2381.  * @param codingset set of VLC to decode data

  2382.  */

  2383. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2384. {

  2385.     GetBitContext *gb = &v->s.gb;

  2386.     MpegEncContext *s = &v->s;

  2387.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2388.     int run_diff, i;

  2389.     int16_t *dc_val;

  2390.     int16_t *ac_val, *ac_val2;

  2391.     int dcdiff;

  2392. 

  2393.     /* Get DC differential */

  2394.     if (n < 4) {

  2395.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2396.     } else {

  2397.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2398.     }

  2399.     if (dcdiff < 0){

  2400.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2401.         return -1;

  2402.     }

  2403.     if (dcdiff)

  2404.     {

  2405.         if (dcdiff == 119 /* ESC index value */)

  2406.         {

  2407.             /* TODO: Optimize */

  2408.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2409.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2410.             else dcdiff = get_bits(gb, 8);

  2411.         }

  2412.         else

  2413.         {

  2414.             if (v->pq == 1)

  2415.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2416.             else if (v->pq == 2)

  2417.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2418.         }

  2419.         if (get_bits(gb, 1))

  2420.             dcdiff = -dcdiff;

  2421.     }

  2422. 

  2423.     /* Prediction */

  2424.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2425.     *dc_val = dcdiff;

  2426. 

  2427.     /* Store the quantized DC coeff, used for prediction */

  2428.     if (n < 4) {

  2429.         block[0] = dcdiff * s->y_dc_scale;

  2430.     } else {

  2431.         block[0] = dcdiff * s->c_dc_scale;

  2432.     }

  2433.     /* Skip ? */

  2434.     run_diff = 0;

  2435.     i = 0;

  2436.     if (!coded) {

  2437.         goto not_coded;

  2438.     }

  2439. 

  2440.     //AC Decoding

  2441.     i = 1;

  2442. 

  2443.     {

  2444.         int last = 0, skip, value;

  2445.         const int8_t *zz_table;

  2446.         int scale;

  2447.         int k;

  2448. 

  2449.         scale = v->pq * 2 + v->halfpq;

  2450. 

  2451.         if(v->s.ac_pred) {

  2452.             if(!dc_pred_dir)

  2453.                 zz_table = ff_vc1_horizontal_zz;

  2454.             else

  2455.                 zz_table = ff_vc1_vertical_zz;

  2456.         } else

  2457.             zz_table = ff_vc1_normal_zz;

  2458. 

  2459.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2460.         ac_val2 = ac_val;

  2461.         if(dc_pred_dir) //left

  2462.             ac_val -= 16;

  2463.         else //top

  2464.             ac_val -= 16 * s->block_wrap[n];

  2465. 

  2466.         while (!last) {

  2467.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2468.             i += skip;

  2469.             if(i > 63)

  2470.                 break;

  2471.             block[zz_table[i++]] = value;

  2472.         }

  2473. 

  2474.         /* apply AC prediction if needed */

  2475.         if(s->ac_pred) {

  2476.             if(dc_pred_dir) { //left

  2477.                 for(k = 1; k < 8; k++)

  2478.                     block[k << 3] += ac_val[k];

  2479.             } else { //top

  2480.                 for(k = 1; k < 8; k++)

  2481.                     block[k] += ac_val[k + 8];

  2482.             }

  2483.         }

  2484.         /* save AC coeffs for further prediction */

  2485.         for(k = 1; k < 8; k++) {

  2486.             ac_val2[k] = block[k << 3];

  2487.             ac_val2[k + 8] = block[k];

  2488.         }

  2489. 

  2490.         /* scale AC coeffs */

  2491.         for(k = 1; k < 64; k++)

  2492.             if(block[k]) {

  2493.                 block[k] *= scale;

  2494.                 if(!v->pquantizer)

  2495.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2496.             }

  2497. 

  2498.         if(s->ac_pred) i = 63;

  2499.     }

  2500. 

  2501. not_coded:

  2502.     if(!coded) {

  2503.         int k, scale;

  2504.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2505.         ac_val2 = ac_val;

  2506. 

  2507.         scale = v->pq * 2 + v->halfpq;

  2508.         memset(ac_val2, 0, 16 * 2);

  2509.         if(dc_pred_dir) {//left

  2510.             ac_val -= 16;

  2511.             if(s->ac_pred)

  2512.                 memcpy(ac_val2, ac_val, 8 * 2);

  2513.         } else {//top

  2514.             ac_val -= 16 * s->block_wrap[n];

  2515.             if(s->ac_pred)

  2516.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2517.         }

  2518. 

  2519.         /* apply AC prediction if needed */

  2520.         if(s->ac_pred) {

  2521.             if(dc_pred_dir) { //left

  2522.                 for(k = 1; k < 8; k++) {

  2523.                     block[k << 3] = ac_val[k] * scale;

  2524.                     if(!v->pquantizer && block[k << 3])

  2525.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2526.                 }

  2527.             } else { //top

  2528.                 for(k = 1; k < 8; k++) {

  2529.                     block[k] = ac_val[k + 8] * scale;

  2530.                     if(!v->pquantizer && block[k])

  2531.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2532.                 }

  2533.             }

  2534.             i = 63;

  2535.         }

  2536.     }

  2537.     s->block_last_index[n] = i;

  2538. 

  2539.     return 0;

  2540. }

  2541. 

  2542. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2543.  * @param v VC1Context

  2544.  * @param block block to decode

  2545.  * @param coded are AC coeffs present or not

  2546.  * @param codingset set of VLC to decode data

  2547.  */

  2548. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2549. {

  2550.     GetBitContext *gb = &v->s.gb;

  2551.     MpegEncContext *s = &v->s;

  2552.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2553.     int run_diff, i;

  2554.     int16_t *dc_val;

  2555.     int16_t *ac_val, *ac_val2;

  2556.     int dcdiff;

  2557.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2558.     int use_pred = s->ac_pred;

  2559.     int scale;

  2560.     int q1, q2 = 0;

  2561.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2562. 

  2563.     /* Get DC differential */

  2564.     if (n < 4) {

  2565.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2566.     } else {

  2567.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2568.     }

  2569.     if (dcdiff < 0){

  2570.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2571.         return -1;

  2572.     }

  2573.     if (dcdiff)

  2574.     {

  2575.         if (dcdiff == 119 /* ESC index value */)

  2576.         {

  2577.             /* TODO: Optimize */

  2578.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2579.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2580.             else dcdiff = get_bits(gb, 8);

  2581.         }

  2582.         else

  2583.         {

  2584.             if (mquant == 1)

  2585.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2586.             else if (mquant == 2)

  2587.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2588.         }

  2589.         if (get_bits(gb, 1))

  2590.             dcdiff = -dcdiff;

  2591.     }

  2592. 

  2593.     /* Prediction */

  2594.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2595.     *dc_val = dcdiff;

  2596. 

  2597.     /* Store the quantized DC coeff, used for prediction */

  2598.     if (n < 4) {

  2599.         block[0] = dcdiff * s->y_dc_scale;

  2600.     } else {

  2601.         block[0] = dcdiff * s->c_dc_scale;

  2602.     }

  2603.     /* Skip ? */

  2604.     run_diff = 0;

  2605.     i = 0;

  2606. 

  2607.     //AC Decoding

  2608.     i = 1;

  2609. 

  2610.     /* check if AC is needed at all and adjust direction if needed */

  2611.     if(!a_avail) dc_pred_dir = 1;

  2612.     if(!c_avail) dc_pred_dir = 0;

  2613.     if(!a_avail && !c_avail) use_pred = 0;

  2614.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2615.     ac_val2 = ac_val;

  2616. 

  2617.     scale = mquant * 2 + v->halfpq;

  2618. 

  2619.     if(dc_pred_dir) //left

  2620.         ac_val -= 16;

  2621.     else //top

  2622.         ac_val -= 16 * s->block_wrap[n];

  2623. 

  2624.     q1 = s->current_picture.qscale_table[mb_pos];

  2625.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2626.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2627.     if(dc_pred_dir && n==1) q2 = q1;

  2628.     if(!dc_pred_dir && n==2) q2 = q1;

  2629.     if(n==3) q2 = q1;

  2630. 

  2631.     if(coded) {

  2632.         int last = 0, skip, value;

  2633.         const int8_t *zz_table;

  2634.         int k;

  2635. 

  2636.         if(v->s.ac_pred) {

  2637.             if(!dc_pred_dir)

  2638.                 zz_table = ff_vc1_horizontal_zz;

  2639.             else

  2640.                 zz_table = ff_vc1_vertical_zz;

  2641.         } else

  2642.             zz_table = ff_vc1_normal_zz;

  2643. 

  2644.         while (!last) {

  2645.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2646.             i += skip;

  2647.             if(i > 63)

  2648.                 break;

  2649.             block[zz_table[i++]] = value;

  2650.         }

  2651. 

  2652.         /* apply AC prediction if needed */

  2653.         if(use_pred) {

  2654.             /* scale predictors if needed*/

  2655.             if(q2 && q1!=q2) {

  2656.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2657.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2658. 

  2659.                 if(dc_pred_dir) { //left

  2660.                     for(k = 1; k < 8; k++)

  2661.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2662.                 } else { //top

  2663.                     for(k = 1; k < 8; k++)

  2664.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2665.                 }

  2666.             } else {

  2667.                 if(dc_pred_dir) { //left

  2668.                     for(k = 1; k < 8; k++)

  2669.                         block[k << 3] += ac_val[k];

  2670.                 } else { //top

  2671.                     for(k = 1; k < 8; k++)

  2672.                         block[k] += ac_val[k + 8];

  2673.                 }

  2674.             }

  2675.         }

  2676.         /* save AC coeffs for further prediction */

  2677.         for(k = 1; k < 8; k++) {

  2678.             ac_val2[k] = block[k << 3];

  2679.             ac_val2[k + 8] = block[k];

  2680.         }

  2681. 

  2682.         /* scale AC coeffs */

  2683.         for(k = 1; k < 64; k++)

  2684.             if(block[k]) {

  2685.                 block[k] *= scale;

  2686.                 if(!v->pquantizer)

  2687.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2688.             }

  2689. 

  2690.         if(use_pred) i = 63;

  2691.     } else { // no AC coeffs

  2692.         int k;

  2693. 

  2694.         memset(ac_val2, 0, 16 * 2);

  2695.         if(dc_pred_dir) {//left

  2696.             if(use_pred) {

  2697.                 memcpy(ac_val2, ac_val, 8 * 2);

  2698.                 if(q2 && q1!=q2) {

  2699.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2700.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2701.                     for(k = 1; k < 8; k++)

  2702.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2703.                 }

  2704.             }

  2705.         } else {//top

  2706.             if(use_pred) {

  2707.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2708.                 if(q2 && q1!=q2) {

  2709.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2710.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2711.                     for(k = 1; k < 8; k++)

  2712.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2713.                 }

  2714.             }

  2715.         }

  2716. 

  2717.         /* apply AC prediction if needed */

  2718.         if(use_pred) {

  2719.             if(dc_pred_dir) { //left

  2720.                 for(k = 1; k < 8; k++) {

  2721.                     block[k << 3] = ac_val2[k] * scale;

  2722.                     if(!v->pquantizer && block[k << 3])

  2723.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2724.                 }

  2725.             } else { //top

  2726.                 for(k = 1; k < 8; k++) {

  2727.                     block[k] = ac_val2[k + 8] * scale;

  2728.                     if(!v->pquantizer && block[k])

  2729.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2730.                 }

  2731.             }

  2732.             i = 63;

  2733.         }

  2734.     }

  2735.     s->block_last_index[n] = i;

  2736. 

  2737.     return 0;

  2738. }

  2739. 

  2740. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2741.  * @param v VC1Context

  2742.  * @param block block to decode

  2743.  * @param coded are AC coeffs present or not

  2744.  * @param mquant block quantizer

  2745.  * @param codingset set of VLC to decode data

  2746.  */

  2747. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2748. {

  2749.     GetBitContext *gb = &v->s.gb;

  2750.     MpegEncContext *s = &v->s;

  2751.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2752.     int run_diff, i;

  2753.     int16_t *dc_val;

  2754.     int16_t *ac_val, *ac_val2;

  2755.     int dcdiff;

  2756.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2757.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2758.     int use_pred = s->ac_pred;

  2759.     int scale;

  2760.     int q1, q2 = 0;

  2761. 

  2762.     /* XXX: Guard against dumb values of mquant */

  2763.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2764. 

  2765.     /* Set DC scale - y and c use the same */

  2766.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2767.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2768. 

  2769.     /* Get DC differential */

  2770.     if (n < 4) {

  2771.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2772.     } else {

  2773.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2774.     }

  2775.     if (dcdiff < 0){

  2776.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2777.         return -1;

  2778.     }

  2779.     if (dcdiff)

  2780.     {

  2781.         if (dcdiff == 119 /* ESC index value */)

  2782.         {

  2783.             /* TODO: Optimize */

  2784.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2785.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2786.             else dcdiff = get_bits(gb, 8);

  2787.         }

  2788.         else

  2789.         {

  2790.             if (mquant == 1)

  2791.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2792.             else if (mquant == 2)

  2793.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2794.         }

  2795.         if (get_bits(gb, 1))

  2796.             dcdiff = -dcdiff;

  2797.     }

  2798. 

  2799.     /* Prediction */

  2800.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2801.     *dc_val = dcdiff;

  2802. 

  2803.     /* Store the quantized DC coeff, used for prediction */

  2804. 

  2805.     if (n < 4) {

  2806.         block[0] = dcdiff * s->y_dc_scale;

  2807.     } else {

  2808.         block[0] = dcdiff * s->c_dc_scale;

  2809.     }

  2810.     /* Skip ? */

  2811.     run_diff = 0;

  2812.     i = 0;

  2813. 

  2814.     //AC Decoding

  2815.     i = 1;

  2816. 

  2817.     /* check if AC is needed at all and adjust direction if needed */

  2818.     if(!a_avail) dc_pred_dir = 1;

  2819.     if(!c_avail) dc_pred_dir = 0;

  2820.     if(!a_avail && !c_avail) use_pred = 0;

  2821.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2822.     ac_val2 = ac_val;

  2823. 

  2824.     scale = mquant * 2 + v->halfpq;

  2825. 

  2826.     if(dc_pred_dir) //left

  2827.         ac_val -= 16;

  2828.     else //top

  2829.         ac_val -= 16 * s->block_wrap[n];

  2830. 

  2831.     q1 = s->current_picture.qscale_table[mb_pos];

  2832.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2833.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2834.     if(dc_pred_dir && n==1) q2 = q1;

  2835.     if(!dc_pred_dir && n==2) q2 = q1;

  2836.     if(n==3) q2 = q1;

  2837. 

  2838.     if(coded) {

  2839.         int last = 0, skip, value;

  2840.         const int8_t *zz_table;

  2841.         int k;

  2842. 

  2843.         zz_table = ff_vc1_simple_progressive_8x8_zz;

  2844. 

  2845.         while (!last) {

  2846.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2847.             i += skip;

  2848.             if(i > 63)

  2849.                 break;

  2850.             block[zz_table[i++]] = value;

  2851.         }

  2852. 

  2853.         /* apply AC prediction if needed */

  2854.         if(use_pred) {

  2855.             /* scale predictors if needed*/

  2856.             if(q2 && q1!=q2) {

  2857.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2858.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2859. 

  2860.                 if(dc_pred_dir) { //left

  2861.                     for(k = 1; k < 8; k++)

  2862.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2863.                 } else { //top

  2864.                     for(k = 1; k < 8; k++)

  2865.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2866.                 }

  2867.             } else {

  2868.                 if(dc_pred_dir) { //left

  2869.                     for(k = 1; k < 8; k++)

  2870.                         block[k << 3] += ac_val[k];

  2871.                 } else { //top

  2872.                     for(k = 1; k < 8; k++)

  2873.                         block[k] += ac_val[k + 8];

  2874.                 }

  2875.             }

  2876.         }

  2877.         /* save AC coeffs for further prediction */

  2878.         for(k = 1; k < 8; k++) {

  2879.             ac_val2[k] = block[k << 3];

  2880.             ac_val2[k + 8] = block[k];

  2881.         }

  2882. 

  2883.         /* scale AC coeffs */

  2884.         for(k = 1; k < 64; k++)

  2885.             if(block[k]) {

  2886.                 block[k] *= scale;

  2887.                 if(!v->pquantizer)

  2888.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2889.             }

  2890. 

  2891.         if(use_pred) i = 63;

  2892.     } else { // no AC coeffs

  2893.         int k;

  2894. 

  2895.         memset(ac_val2, 0, 16 * 2);

  2896.         if(dc_pred_dir) {//left

  2897.             if(use_pred) {

  2898.                 memcpy(ac_val2, ac_val, 8 * 2);

  2899.                 if(q2 && q1!=q2) {

  2900.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2901.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2902.                     for(k = 1; k < 8; k++)

  2903.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2904.                 }

  2905.             }

  2906.         } else {//top

  2907.             if(use_pred) {

  2908.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2909.                 if(q2 && q1!=q2) {

  2910.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2911.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2912.                     for(k = 1; k < 8; k++)

  2913.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2914.                 }

  2915.             }

  2916.         }

  2917. 

  2918.         /* apply AC prediction if needed */

  2919.         if(use_pred) {

  2920.             if(dc_pred_dir) { //left

  2921.                 for(k = 1; k < 8; k++) {

  2922.                     block[k << 3] = ac_val2[k] * scale;

  2923.                     if(!v->pquantizer && block[k << 3])

  2924.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2925.                 }

  2926.             } else { //top

  2927.                 for(k = 1; k < 8; k++) {

  2928.                     block[k] = ac_val2[k + 8] * scale;

  2929.                     if(!v->pquantizer && block[k])

  2930.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2931.                 }

  2932.             }

  2933.             i = 63;

  2934.         }

  2935.     }

  2936.     s->block_last_index[n] = i;

  2937. 

  2938.     return 0;

  2939. }

  2940. 

  2941. /** Decode P block

  2942.  */

  2943. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2944. {

  2945.     MpegEncContext *s = &v->s;

  2946.     GetBitContext *gb = &s->gb;

  2947.     int i, j;

  2948.     int subblkpat = 0;

  2949.     int scale, off, idx, last, skip, value;

  2950.     int ttblk = ttmb & 7;

  2951. 

  2952.     if(ttmb == -1) {

  2953.         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)];

  2954.     }

  2955.     if(ttblk == TT_4X4) {

  2956.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2957.     }

  2958.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2959.         subblkpat = decode012(gb);

  2960.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2961.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2962.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2963.     }

  2964.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  2965. 

  2966.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2967.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2968.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2969.         ttblk = TT_8X4;

  2970.     }

  2971.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2972.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2973.         ttblk = TT_4X8;

  2974.     }

  2975.     switch(ttblk) {

  2976.     case TT_8X8:

  2977.         i = 0;

  2978.         last = 0;

  2979.         while (!last) {

  2980.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2981.             i += skip;

  2982.             if(i > 63)

  2983.                 break;

  2984.             idx = ff_vc1_simple_progressive_8x8_zz[i++];

  2985.             block[idx] = value * scale;

  2986.             if(!v->pquantizer)

  2987.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2988.         }

  2989.         s->dsp.vc1_inv_trans_8x8(block);

  2990.         break;

  2991.     case TT_4X4:

  2992.         for(j = 0; j < 4; j++) {

  2993.             last = subblkpat & (1 << (3 - j));

  2994.             i = 0;

  2995.             off = (j & 1) * 4 + (j & 2) * 16;

  2996.             while (!last) {

  2997.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2998.                 i += skip;

  2999.                 if(i > 15)

  3000.                     break;

  3001.                 idx = ff_vc1_simple_progressive_4x4_zz[i++];

  3002.                 block[idx + off] = value * scale;

  3003.                 if(!v->pquantizer)

  3004.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3005.             }

  3006.             if(!(subblkpat & (1 << (3 - j))))

  3007.                 s->dsp.vc1_inv_trans_4x4(block, j);

  3008.         }

  3009.         break;

  3010.     case TT_8X4:

  3011.         for(j = 0; j < 2; j++) {

  3012.             last = subblkpat & (1 << (1 - j));

  3013.             i = 0;

  3014.             off = j * 32;

  3015.             while (!last) {

  3016.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3017.                 i += skip;

  3018.                 if(i > 31)

  3019.                     break;

  3020.                 if(v->profile < PROFILE_ADVANCED)

  3021.                     idx = ff_vc1_simple_progressive_8x4_zz[i++];

  3022.                 else

  3023.                     idx = ff_vc1_adv_progressive_8x4_zz[i++];

  3024.                 block[idx + off] = value * scale;

  3025.                 if(!v->pquantizer)

  3026.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3027.             }

  3028.             if(!(subblkpat & (1 << (1 - j))))

  3029.                 s->dsp.vc1_inv_trans_8x4(block, j);

  3030.         }

  3031.         break;

  3032.     case TT_4X8:

  3033.         for(j = 0; j < 2; j++) {

  3034.             last = subblkpat & (1 << (1 - j));

  3035.             i = 0;

  3036.             off = j * 4;

  3037.             while (!last) {

  3038.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3039.                 i += skip;

  3040.                 if(i > 31)

  3041.                     break;

  3042.                 if(v->profile < PROFILE_ADVANCED)

  3043.                     idx = ff_vc1_simple_progressive_4x8_zz[i++];

  3044.                 else

  3045.                     idx = ff_vc1_adv_progressive_4x8_zz[i++];

  3046.                 block[idx + off] = value * scale;

  3047.                 if(!v->pquantizer)

  3048.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3049.             }

  3050.             if(!(subblkpat & (1 << (1 - j))))

  3051.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3052.         }

  3053.         break;

  3054.     }

  3055.     return 0;

  3056. }

  3057. 

  3058. 

  3059. /** Decode one P-frame MB (in Simple/Main profile)

  3060.  */

  3061. static int vc1_decode_p_mb(VC1Context *v)

  3062. {

  3063.     MpegEncContext *s = &v->s;

  3064.     GetBitContext *gb = &s->gb;

  3065.     int i, j;

  3066.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3067.     int cbp; /* cbp decoding stuff */

  3068.     int mqdiff, mquant; /* MB quantization */

  3069.     int ttmb = v->ttfrm; /* MB Transform type */

  3070.     int status;

  3071. 

  3072.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3073.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3074.     int mb_has_coeffs = 1; /* last_flag */

  3075.     int dmv_x, dmv_y; /* Differential MV components */

  3076.     int index, index1; /* LUT indices */

  3077.     int val, sign; /* temp values */

  3078.     int first_block = 1;

  3079.     int dst_idx, off;

  3080.     int skipped, fourmv;

  3081. 

  3082.     mquant = v->pq; /* Loosy initialization */

  3083. 

  3084.     if (v->mv_type_is_raw)

  3085.         fourmv = get_bits1(gb);

  3086.     else

  3087.         fourmv = v->mv_type_mb_plane[mb_pos];

  3088.     if (v->skip_is_raw)

  3089.         skipped = get_bits1(gb);

  3090.     else

  3091.         skipped = v->s.mbskip_table[mb_pos];

  3092. 

  3093.     s->dsp.clear_blocks(s->block[0]);

  3094. 

  3095.     if (!fourmv) /* 1MV mode */

  3096.     {

  3097.         if (!skipped)

  3098.         {

  3099.             GET_MVDATA(dmv_x, dmv_y);

  3100. 

  3101.             if (s->mb_intra) {

  3102.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3103.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3104.             }

  3105.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3106.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3107. 

  3108.             /* FIXME Set DC val for inter block ? */

  3109.             if (s->mb_intra && !mb_has_coeffs)

  3110.             {

  3111.                 GET_MQUANT();

  3112.                 s->ac_pred = get_bits(gb, 1);

  3113.                 cbp = 0;

  3114.             }

  3115.             else if (mb_has_coeffs)

  3116.             {

  3117.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  3118.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3119.                 GET_MQUANT();

  3120.             }

  3121.             else

  3122.             {

  3123.                 mquant = v->pq;

  3124.                 cbp = 0;

  3125.             }

  3126.             s->current_picture.qscale_table[mb_pos] = mquant;

  3127. 

  3128.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3129.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3130.                                 VC1_TTMB_VLC_BITS, 2);

  3131.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3132.             dst_idx = 0;

  3133.             for (i=0; i<6; i++)

  3134.             {

  3135.                 s->dc_val[0][s->block_index[i]] = 0;

  3136.                 dst_idx += i >> 2;

  3137.                 val = ((cbp >> (5 - i)) & 1);

  3138.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3139.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3140.                 if(s->mb_intra) {

  3141.                     /* check if prediction blocks A and C are available */

  3142.                     v->a_avail = v->c_avail = 0;

  3143.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3144.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3145.                     if(i == 1 || i == 3 || s->mb_x)

  3146.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3147. 

  3148.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3149.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3150.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3151.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3152.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3153.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3154.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3155.                     if(v->pq >= 9 && v->overlap) {

  3156.                         if(v->c_avail)

  3157.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3158.                         if(v->a_avail)

  3159.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3160.                     }

  3161.                 } else if(val) {

  3162.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3163.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3164.                     first_block = 0;

  3165.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3166.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3167.                 }

  3168.             }

  3169.         }

  3170.         else //Skipped

  3171.         {

  3172.             s->mb_intra = 0;

  3173.             for(i = 0; i < 6; i++) {

  3174.                 v->mb_type[0][s->block_index[i]] = 0;

  3175.                 s->dc_val[0][s->block_index[i]] = 0;

  3176.             }

  3177.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3178.             s->current_picture.qscale_table[mb_pos] = 0;

  3179.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3180.             vc1_mc_1mv(v, 0);

  3181.             return 0;

  3182.         }

  3183.     } //1MV mode

  3184.     else //4MV mode

  3185.     {

  3186.         if (!skipped /* unskipped MB */)

  3187.         {

  3188.             int intra_count = 0, coded_inter = 0;

  3189.             int is_intra[6], is_coded[6];

  3190.             /* Get CBPCY */

  3191.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3192.             for (i=0; i<6; i++)

  3193.             {

  3194.                 val = ((cbp >> (5 - i)) & 1);

  3195.                 s->dc_val[0][s->block_index[i]] = 0;

  3196.                 s->mb_intra = 0;

  3197.                 if(i < 4) {

  3198.                     dmv_x = dmv_y = 0;

  3199.                     s->mb_intra = 0;

  3200.                     mb_has_coeffs = 0;

  3201.                     if(val) {

  3202.                         GET_MVDATA(dmv_x, dmv_y);

  3203.                     }

  3204.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3205.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3206.                     intra_count += s->mb_intra;

  3207.                     is_intra[i] = s->mb_intra;

  3208.                     is_coded[i] = mb_has_coeffs;

  3209.                 }

  3210.                 if(i&4){

  3211.                     is_intra[i] = (intra_count >= 3);

  3212.                     is_coded[i] = val;

  3213.                 }

  3214.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3215.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3216.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3217.             }

  3218.             // if there are no coded blocks then don't do anything more

  3219.             if(!intra_count && !coded_inter) return 0;

  3220.             dst_idx = 0;

  3221.             GET_MQUANT();

  3222.             s->current_picture.qscale_table[mb_pos] = mquant;

  3223.             /* test if block is intra and has pred */

  3224.             {

  3225.                 int intrapred = 0;

  3226.                 for(i=0; i<6; i++)

  3227.                     if(is_intra[i]) {

  3228.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3229.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3230.                             intrapred = 1;

  3231.                             break;

  3232.                         }

  3233.                     }

  3234.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  3235.                 else s->ac_pred = 0;

  3236.             }

  3237.             if (!v->ttmbf && coded_inter)

  3238.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3239.             for (i=0; i<6; i++)

  3240.             {

  3241.                 dst_idx += i >> 2;

  3242.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3243.                 s->mb_intra = is_intra[i];

  3244.                 if (is_intra[i]) {

  3245.                     /* check if prediction blocks A and C are available */

  3246.                     v->a_avail = v->c_avail = 0;

  3247.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3248.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3249.                     if(i == 1 || i == 3 || s->mb_x)

  3250.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3251. 

  3252.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3253.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3254.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3255.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3256.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3257.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3258.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3259.                     if(v->pq >= 9 && v->overlap) {

  3260.                         if(v->c_avail)

  3261.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3262.                         if(v->a_avail)

  3263.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3264.                     }

  3265.                 } else if(is_coded[i]) {

  3266.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3267.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3268.                     first_block = 0;

  3269.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3270.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3271.                 }

  3272.             }

  3273.             return status;

  3274.         }

  3275.         else //Skipped MB

  3276.         {

  3277.             s->mb_intra = 0;

  3278.             s->current_picture.qscale_table[mb_pos] = 0;

  3279.             for (i=0; i<6; i++) {

  3280.                 v->mb_type[0][s->block_index[i]] = 0;

  3281.                 s->dc_val[0][s->block_index[i]] = 0;

  3282.             }

  3283.             for (i=0; i<4; i++)

  3284.             {

  3285.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3286.                 vc1_mc_4mv_luma(v, i);

  3287.             }

  3288.             vc1_mc_4mv_chroma(v);

  3289.             s->current_picture.qscale_table[mb_pos] = 0;

  3290.             return 0;

  3291.         }

  3292.     }

  3293. 

  3294.     /* Should never happen */

  3295.     return -1;

  3296. }

  3297. 

  3298. /** Decode one B-frame MB (in Main profile)

  3299.  */

  3300. static void vc1_decode_b_mb(VC1Context *v)

  3301. {

  3302.     MpegEncContext *s = &v->s;

  3303.     GetBitContext *gb = &s->gb;

  3304.     int i, j;

  3305.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3306.     int cbp = 0; /* cbp decoding stuff */

  3307.     int mqdiff, mquant; /* MB quantization */

  3308.     int ttmb = v->ttfrm; /* MB Transform type */

  3309. 

  3310.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3311.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3312.     int mb_has_coeffs = 0; /* last_flag */

  3313.     int index, index1; /* LUT indices */

  3314.     int val, sign; /* temp values */

  3315.     int first_block = 1;

  3316.     int dst_idx, off;

  3317.     int skipped, direct;

  3318.     int dmv_x[2], dmv_y[2];

  3319.     int bmvtype = BMV_TYPE_BACKWARD;

  3320. 

  3321.     mquant = v->pq; /* Loosy initialization */

  3322.     s->mb_intra = 0;

  3323. 

  3324.     if (v->dmb_is_raw)

  3325.         direct = get_bits1(gb);

  3326.     else

  3327.         direct = v->direct_mb_plane[mb_pos];

  3328.     if (v->skip_is_raw)

  3329.         skipped = get_bits1(gb);

  3330.     else

  3331.         skipped = v->s.mbskip_table[mb_pos];

  3332. 

  3333.     s->dsp.clear_blocks(s->block[0]);

  3334.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3335.     for(i = 0; i < 6; i++) {

  3336.         v->mb_type[0][s->block_index[i]] = 0;

  3337.         s->dc_val[0][s->block_index[i]] = 0;

  3338.     }

  3339.     s->current_picture.qscale_table[mb_pos] = 0;

  3340. 

  3341.     if (!direct) {

  3342.         if (!skipped) {

  3343.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3344.             dmv_x[1] = dmv_x[0];

  3345.             dmv_y[1] = dmv_y[0];

  3346.         }

  3347.         if(skipped || !s->mb_intra) {

  3348.             bmvtype = decode012(gb);

  3349.             switch(bmvtype) {

  3350.             case 0:

  3351.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3352.                 break;

  3353.             case 1:

  3354.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3355.                 break;

  3356.             case 2:

  3357.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3358.                 dmv_x[0] = dmv_y[0] = 0;

  3359.             }

  3360.         }

  3361.     }

  3362.     for(i = 0; i < 6; i++)

  3363.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3364. 

  3365.     if (skipped) {

  3366.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3367.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3368.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3369.         return;

  3370.     }

  3371.     if (direct) {

  3372.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3373.         GET_MQUANT();

  3374.         s->mb_intra = 0;

  3375.         mb_has_coeffs = 0;

  3376.         s->current_picture.qscale_table[mb_pos] = mquant;

  3377.         if(!v->ttmbf)

  3378.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3379.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3380.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3381.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3382.     } else {

  3383.         if(!mb_has_coeffs && !s->mb_intra) {

  3384.             /* no coded blocks - effectively skipped */

  3385.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3386.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3387.             return;

  3388.         }

  3389.         if(s->mb_intra && !mb_has_coeffs) {

  3390.             GET_MQUANT();

  3391.             s->current_picture.qscale_table[mb_pos] = mquant;

  3392.             s->ac_pred = get_bits1(gb);

  3393.             cbp = 0;

  3394.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3395.         } else {

  3396.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3397.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3398.                 if(!mb_has_coeffs) {

  3399.                     /* interpolated skipped block */

  3400.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3401.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3402.                     return;

  3403.                 }

  3404.             }

  3405.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3406.             if(!s->mb_intra) {

  3407.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3408.             }

  3409.             if(s->mb_intra)

  3410.                 s->ac_pred = get_bits1(gb);

  3411.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3412.             GET_MQUANT();

  3413.             s->current_picture.qscale_table[mb_pos] = mquant;

  3414.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3415.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3416.         }

  3417.     }

  3418.     dst_idx = 0;

  3419.     for (i=0; i<6; i++)

  3420.     {

  3421.         s->dc_val[0][s->block_index[i]] = 0;

  3422.         dst_idx += i >> 2;

  3423.         val = ((cbp >> (5 - i)) & 1);

  3424.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3425.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3426.         if(s->mb_intra) {

  3427.             /* check if prediction blocks A and C are available */

  3428.             v->a_avail = v->c_avail = 0;

  3429.             if(i == 2 || i == 3 || !s->first_slice_line)

  3430.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3431.             if(i == 1 || i == 3 || s->mb_x)

  3432.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3433. 

  3434.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3435.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3436.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3437.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3438.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3439.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3440.         } else if(val) {

  3441.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3442.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3443.             first_block = 0;

  3444.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3445.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3446.         }

  3447.     }

  3448. }

  3449. 

  3450. /** Decode blocks of I-frame

  3451.  */

  3452. static void vc1_decode_i_blocks(VC1Context *v)

  3453. {

  3454.     int k, j;

  3455.     MpegEncContext *s = &v->s;

  3456.     int cbp, val;

  3457.     uint8_t *coded_val;

  3458.     int mb_pos;

  3459. 

  3460.     /* select codingmode used for VLC tables selection */

  3461.     switch(v->y_ac_table_index){

  3462.     case 0:

  3463.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3464.         break;

  3465.     case 1:

  3466.         v->codingset = CS_HIGH_MOT_INTRA;

  3467.         break;

  3468.     case 2:

  3469.         v->codingset = CS_MID_RATE_INTRA;

  3470.         break;

  3471.     }

  3472. 

  3473.     switch(v->c_ac_table_index){

  3474.     case 0:

  3475.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3476.         break;

  3477.     case 1:

  3478.         v->codingset2 = CS_HIGH_MOT_INTER;

  3479.         break;

  3480.     case 2:

  3481.         v->codingset2 = CS_MID_RATE_INTER;

  3482.         break;

  3483.     }

  3484. 

  3485.     /* Set DC scale - y and c use the same */

  3486.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3487.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3488. 

  3489.     //do frame decode

  3490.     s->mb_x = s->mb_y = 0;

  3491.     s->mb_intra = 1;

  3492.     s->first_slice_line = 1;

  3493.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3494.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3495.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3496.             ff_init_block_index(s);

  3497.             ff_update_block_index(s);

  3498.             s->dsp.clear_blocks(s->block[0]);

  3499.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3500.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3501.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3502.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3503.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3504. 

  3505.             // do actual MB decoding and displaying

  3506.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3507.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  3508. 

  3509.             for(k = 0; k < 6; k++) {

  3510.                 val = ((cbp >> (5 - k)) & 1);

  3511. 

  3512.                 if (k < 4) {

  3513.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3514.                     val = val ^ pred;

  3515.                     *coded_val = val;

  3516.                 }

  3517.                 cbp |= val << (5 - k);

  3518. 

  3519.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3520. 

  3521.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3522.                 if(!v->res_fasttx && !v->res_x8) for(j = 0; j < 64; j++) s->block[k][j] -= 16;

  3523.                 if(v->pq >= 9 && v->overlap) {

  3524.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3525.                 }

  3526.             }

  3527. 

  3528.             vc1_put_block(v, s->block);

  3529.             if(v->pq >= 9 && v->overlap) {

  3530.                 if(s->mb_x) {

  3531.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3532.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3533.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3534.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3535.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3536.                     }

  3537.                 }

  3538.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3539.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3540.                 if(!s->first_slice_line) {

  3541.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3542.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3543.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3544.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3545.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3546.                     }

  3547.                 }

  3548.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3549.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3550.             }

  3551. 

  3552.             if(get_bits_count(&s->gb) > v->bits) {

  3553.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3554.                 return;

  3555.             }

  3556.         }

  3557.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3558.         s->first_slice_line = 0;

  3559.     }

  3560. }

  3561. 

  3562. /** Decode blocks of I-frame for advanced profile

  3563.  */

  3564. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3565. {

  3566.     int k, j;

  3567.     MpegEncContext *s = &v->s;

  3568.     int cbp, val;

  3569.     uint8_t *coded_val;

  3570.     int mb_pos;

  3571.     int mquant = v->pq;

  3572.     int mqdiff;

  3573.     int overlap;

  3574.     GetBitContext *gb = &s->gb;

  3575. 

  3576.     /* select codingmode used for VLC tables selection */

  3577.     switch(v->y_ac_table_index){

  3578.     case 0:

  3579.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3580.         break;

  3581.     case 1:

  3582.         v->codingset = CS_HIGH_MOT_INTRA;

  3583.         break;

  3584.     case 2:

  3585.         v->codingset = CS_MID_RATE_INTRA;

  3586.         break;

  3587.     }

  3588. 

  3589.     switch(v->c_ac_table_index){

  3590.     case 0:

  3591.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3592.         break;

  3593.     case 1:

  3594.         v->codingset2 = CS_HIGH_MOT_INTER;

  3595.         break;

  3596.     case 2:

  3597.         v->codingset2 = CS_MID_RATE_INTER;

  3598.         break;

  3599.     }

  3600. 

  3601.     //do frame decode

  3602.     s->mb_x = s->mb_y = 0;

  3603.     s->mb_intra = 1;

  3604.     s->first_slice_line = 1;

  3605.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3606.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3607.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3608.             ff_init_block_index(s);

  3609.             ff_update_block_index(s);

  3610.             s->dsp.clear_blocks(s->block[0]);

  3611.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3612.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3613.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3614.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3615. 

  3616.             // do actual MB decoding and displaying

  3617.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3618.             if(v->acpred_is_raw)

  3619.                 v->s.ac_pred = get_bits(&v->s.gb, 1);

  3620.             else

  3621.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3622. 

  3623.             if(v->condover == CONDOVER_SELECT) {

  3624.                 if(v->overflg_is_raw)

  3625.                     overlap = get_bits(&v->s.gb, 1);

  3626.                 else

  3627.                     overlap = v->over_flags_plane[mb_pos];

  3628.             } else

  3629.                 overlap = (v->condover == CONDOVER_ALL);

  3630. 

  3631.             GET_MQUANT();

  3632. 

  3633.             s->current_picture.qscale_table[mb_pos] = mquant;

  3634.             /* Set DC scale - y and c use the same */

  3635.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3636.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3637. 

  3638.             for(k = 0; k < 6; k++) {

  3639.                 val = ((cbp >> (5 - k)) & 1);

  3640. 

  3641.                 if (k < 4) {

  3642.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3643.                     val = val ^ pred;

  3644.                     *coded_val = val;

  3645.                 }

  3646.                 cbp |= val << (5 - k);

  3647. 

  3648.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3649.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3650. 

  3651.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3652. 

  3653.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3654.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3655.             }

  3656. 

  3657.             vc1_put_block(v, s->block);

  3658.             if(overlap) {

  3659.                 if(s->mb_x) {

  3660.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3661.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3662.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3663.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3664.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3665.                     }

  3666.                 }

  3667.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3668.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3669.                 if(!s->first_slice_line) {

  3670.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3671.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3672.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3673.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3674.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3675.                     }

  3676.                 }

  3677.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3678.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3679.             }

  3680. 

  3681.             if(get_bits_count(&s->gb) > v->bits) {

  3682.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3683.                 return;

  3684.             }

  3685.         }

  3686.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3687.         s->first_slice_line = 0;

  3688.     }

  3689. }

  3690. 

  3691. static void vc1_decode_p_blocks(VC1Context *v)

  3692. {

  3693.     MpegEncContext *s = &v->s;

  3694. 

  3695.     /* select codingmode used for VLC tables selection */

  3696.     switch(v->c_ac_table_index){

  3697.     case 0:

  3698.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3699.         break;

  3700.     case 1:

  3701.         v->codingset = CS_HIGH_MOT_INTRA;

  3702.         break;

  3703.     case 2:

  3704.         v->codingset = CS_MID_RATE_INTRA;

  3705.         break;

  3706.     }

  3707. 

  3708.     switch(v->c_ac_table_index){

  3709.     case 0:

  3710.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3711.         break;

  3712.     case 1:

  3713.         v->codingset2 = CS_HIGH_MOT_INTER;

  3714.         break;

  3715.     case 2:

  3716.         v->codingset2 = CS_MID_RATE_INTER;

  3717.         break;

  3718.     }

  3719. 

  3720.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3721.     s->first_slice_line = 1;

  3722.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3723.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3724.             ff_init_block_index(s);

  3725.             ff_update_block_index(s);

  3726.             s->dsp.clear_blocks(s->block[0]);

  3727. 

  3728.             vc1_decode_p_mb(v);

  3729.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3730.                 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);

  3731.                 return;

  3732.             }

  3733.         }

  3734.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3735.         s->first_slice_line = 0;

  3736.     }

  3737. }

  3738. 

  3739. static void vc1_decode_b_blocks(VC1Context *v)

  3740. {

  3741.     MpegEncContext *s = &v->s;

  3742. 

  3743.     /* select codingmode used for VLC tables selection */

  3744.     switch(v->c_ac_table_index){

  3745.     case 0:

  3746.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3747.         break;

  3748.     case 1:

  3749.         v->codingset = CS_HIGH_MOT_INTRA;

  3750.         break;

  3751.     case 2:

  3752.         v->codingset = CS_MID_RATE_INTRA;

  3753.         break;

  3754.     }

  3755. 

  3756.     switch(v->c_ac_table_index){

  3757.     case 0:

  3758.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3759.         break;

  3760.     case 1:

  3761.         v->codingset2 = CS_HIGH_MOT_INTER;

  3762.         break;

  3763.     case 2:

  3764.         v->codingset2 = CS_MID_RATE_INTER;

  3765.         break;

  3766.     }

  3767. 

  3768.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3769.     s->first_slice_line = 1;

  3770.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3771.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3772.             ff_init_block_index(s);

  3773.             ff_update_block_index(s);

  3774.             s->dsp.clear_blocks(s->block[0]);

  3775. 

  3776.             vc1_decode_b_mb(v);

  3777.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3778.                 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);

  3779.                 return;

  3780.             }

  3781.         }

  3782.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3783.         s->first_slice_line = 0;

  3784.     }

  3785. }

  3786. 

  3787. static void vc1_decode_skip_blocks(VC1Context *v)

  3788. {

  3789.     MpegEncContext *s = &v->s;

  3790. 

  3791.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3792.     s->first_slice_line = 1;

  3793.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3794.         s->mb_x = 0;

  3795.         ff_init_block_index(s);

  3796.         ff_update_block_index(s);

  3797.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  3798.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3799.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3800.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3801.         s->first_slice_line = 0;

  3802.     }

  3803.     s->pict_type = P_TYPE;

  3804. }

  3805. 

  3806. static void vc1_decode_blocks(VC1Context *v)

  3807. {

  3808. 

  3809.     v->s.esc3_level_length = 0;

  3810. 

  3811.     switch(v->s.pict_type) {

  3812.     case I_TYPE:

  3813.         if(v->profile == PROFILE_ADVANCED)

  3814.             vc1_decode_i_blocks_adv(v);

  3815.         else

  3816.             vc1_decode_i_blocks(v);

  3817.         break;

  3818.     case P_TYPE:

  3819.         if(v->p_frame_skipped)

  3820.             vc1_decode_skip_blocks(v);

  3821.         else

  3822.             vc1_decode_p_blocks(v);

  3823.         break;

  3824.     case B_TYPE:

  3825.         if(v->bi_type){

  3826.             if(v->profile == PROFILE_ADVANCED)

  3827.                 vc1_decode_i_blocks_adv(v);

  3828.             else

  3829.                 vc1_decode_i_blocks(v);

  3830.         }else

  3831.             vc1_decode_b_blocks(v);

  3832.         break;

  3833.     }

  3834. }

  3835. 

  3836. /** Find VC-1 marker in buffer

  3837.  * @return position where next marker starts or end of buffer if no marker found

  3838.  */

  3839. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  3840. {

  3841.     uint32_t mrk = 0xFFFFFFFF;

  3842. 

  3843.     if(end-src < 4) return end;

  3844.     while(src < end){

  3845.         mrk = (mrk << 8) | *src++;

  3846.         if(IS_MARKER(mrk))

  3847.             return src-4;

  3848.     }

  3849.     return end;

  3850. }

  3851. 

  3852. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  3853. {

  3854.     int dsize = 0, i;

  3855. 

  3856.     if(size < 4){

  3857.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  3858.         return size;

  3859.     }

  3860.     for(i = 0; i < size; i++, src++) {

  3861.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  3862.             dst[dsize++] = src[1];

  3863.             src++;

  3864.             i++;

  3865.         } else

  3866.             dst[dsize++] = *src;

  3867.     }

  3868.     return dsize;

  3869. }

  3870. 

  3871. /** Initialize a VC1/WMV3 decoder

  3872.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3873.  * @todo TODO: Decypher remaining bits in extra_data

  3874.  */

  3875. static int vc1_decode_init(AVCodecContext *avctx)

  3876. {

  3877.     VC1Context *v = avctx->priv_data;

  3878.     MpegEncContext *s = &v->s;

  3879.     GetBitContext gb;

  3880. 

  3881.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3882.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3883.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3884.     else

  3885.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3886.     v->s.avctx = avctx;

  3887.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3888.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3889. 

  3890.     if(ff_h263_decode_init(avctx) < 0)

  3891.         return -1;

  3892.     if (vc1_init_common(v) < 0) return -1;

  3893. 

  3894.     avctx->coded_width = avctx->width;

  3895.     avctx->coded_height = avctx->height;

  3896.     if (avctx->codec_id == CODEC_ID_WMV3)

  3897.     {

  3898.         int count = 0;

  3899. 

  3900.         // looks like WMV3 has a sequence header stored in the extradata

  3901.         // advanced sequence header may be before the first frame

  3902.         // the last byte of the extradata is a version number, 1 for the

  3903.         // samples we can decode

  3904. 

  3905.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3906. 

  3907.         if (decode_sequence_header(avctx, &gb) < 0)

  3908.           return -1;

  3909. 

  3910.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3911.         if (count>0)

  3912.         {

  3913.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3914.                    count, get_bits(&gb, count));

  3915.         }

  3916.         else if (count < 0)

  3917.         {

  3918.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3919.         }

  3920.     } else { // VC1/WVC1

  3921.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  3922.         uint8_t *next; int size, buf2_size;

  3923.         uint8_t *buf2 = NULL;

  3924.         int seq_inited = 0, ep_inited = 0;

  3925. 

  3926.         if(avctx->extradata_size < 16) {

  3927.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  3928.             return -1;

  3929.         }

  3930. 

  3931.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3932.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  3933.         next = start;

  3934.         for(; next < end; start = next){

  3935.             next = find_next_marker(start + 4, end);

  3936.             size = next - start - 4;

  3937.             if(size <= 0) continue;

  3938.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  3939.             init_get_bits(&gb, buf2, buf2_size * 8);

  3940.             switch(AV_RB32(start)){

  3941.             case VC1_CODE_SEQHDR:

  3942.                 if(decode_sequence_header(avctx, &gb) < 0){

  3943.                     av_free(buf2);

  3944.                     return -1;

  3945.                 }

  3946.                 seq_inited = 1;

  3947.                 break;

  3948.             case VC1_CODE_ENTRYPOINT:

  3949.                 if(decode_entry_point(avctx, &gb) < 0){

  3950.                     av_free(buf2);

  3951.                     return -1;

  3952.                 }

  3953.                 ep_inited = 1;

  3954.                 break;

  3955.             }

  3956.         }

  3957.         av_free(buf2);

  3958.         if(!seq_inited || !ep_inited){

  3959.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  3960.             return -1;

  3961.         }

  3962.     }

  3963.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3964.     s->low_delay = !avctx->has_b_frames;

  3965. 

  3966.     s->mb_width = (avctx->coded_width+15)>>4;

  3967.     s->mb_height = (avctx->coded_height+15)>>4;

  3968. 

  3969.     /* Allocate mb bitplanes */

  3970.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3971.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3972.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  3973.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  3974. 

  3975.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3976.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3977.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3978.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3979.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3980. 

  3981.     /* Init coded blocks info */

  3982.     if (v->profile == PROFILE_ADVANCED)

  3983.     {

  3984. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3985. //            return -1;

  3986. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3987. //            return -1;

  3988.     }

  3989. 

  3990.     return 0;

  3991. }

  3992. 

  3993. 

  3994. /** Decode a VC1/WMV3 frame

  3995.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3996.  */

  3997. static int vc1_decode_frame(AVCodecContext *avctx,

  3998.                             void *data, int *data_size,

  3999.                             uint8_t *buf, int buf_size)

  4000. {

  4001.     VC1Context *v = avctx->priv_data;

  4002.     MpegEncContext *s = &v->s;

  4003.     AVFrame *pict = data;

  4004.     uint8_t *buf2 = NULL;

  4005. 

  4006.     /* no supplementary picture */

  4007.     if (buf_size == 0) {

  4008.         /* special case for last picture */

  4009.         if (s->low_delay==0 && s->next_picture_ptr) {

  4010.             *pict= *(AVFrame*)s->next_picture_ptr;

  4011.             s->next_picture_ptr= NULL;

  4012. 

  4013.             *data_size = sizeof(AVFrame);

  4014.         }

  4015. 

  4016.         return 0;

  4017.     }

  4018. 

  4019.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  4020.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  4021.         int i= ff_find_unused_picture(s, 0);

  4022.         s->current_picture_ptr= &s->picture[i];

  4023.     }

  4024. 

  4025.     //for advanced profile we may need to parse and unescape data

  4026.     if (avctx->codec_id == CODEC_ID_VC1) {

  4027.         int buf_size2 = 0;

  4028.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4029. 

  4030.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  4031.             uint8_t *start, *end, *next;

  4032.             int size;

  4033. 

  4034.             next = buf;

  4035.             for(start = buf, end = buf + buf_size; next < end; start = next){

  4036.                 next = find_next_marker(start + 4, end);

  4037.                 size = next - start - 4;

  4038.                 if(size <= 0) continue;

  4039.                 switch(AV_RB32(start)){

  4040.                 case VC1_CODE_FRAME:

  4041.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4042.                     break;

  4043.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4044.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4045.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4046.                     decode_entry_point(avctx, &s->gb);

  4047.                     break;

  4048.                 case VC1_CODE_SLICE:

  4049.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4050.                     av_free(buf2);

  4051.                     return -1;

  4052.                 }

  4053.             }

  4054.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4055.             uint8_t *divider;

  4056. 

  4057.             divider = find_next_marker(buf, buf + buf_size);

  4058.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4059.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4060.                 return -1;

  4061.             }

  4062. 

  4063.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4064.             // TODO

  4065.             av_free(buf2);return -1;

  4066.         }else{

  4067.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4068.         }

  4069.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4070.     } else

  4071.         init_get_bits(&s->gb, buf, buf_size*8);

  4072.     // do parse frame header

  4073.     if(v->profile < PROFILE_ADVANCED) {

  4074.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4075.             av_free(buf2);

  4076.             return -1;

  4077.         }

  4078.     } else {

  4079.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4080.             av_free(buf2);

  4081.             return -1;

  4082.         }

  4083.     }

  4084. 

  4085.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4086.         av_free(buf2);

  4087.         return -1;

  4088.     }

  4089. 

  4090.     // for hurry_up==5

  4091.     s->current_picture.pict_type= s->pict_type;

  4092.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4093. 

  4094.     /* skip B-frames if we don't have reference frames */

  4095.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4096.         av_free(buf2);

  4097.         return -1;//buf_size;

  4098.     }

  4099.     /* skip b frames if we are in a hurry */

  4100.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4101.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4102.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4103.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4104.         av_free(buf2);

  4105.         return buf_size;

  4106.     }

  4107.     /* skip everything if we are in a hurry>=5 */

  4108.     if(avctx->hurry_up>=5) {

  4109.         av_free(buf2);

  4110.         return -1;//buf_size;

  4111.     }

  4112. 

  4113.     if(s->next_p_frame_damaged){

  4114.         if(s->pict_type==B_TYPE)

  4115.             return buf_size;

  4116.         else

  4117.             s->next_p_frame_damaged=0;

  4118.     }

  4119. 

  4120.     if(MPV_frame_start(s, avctx) < 0) {

  4121.         av_free(buf2);

  4122.         return -1;

  4123.     }

  4124. 

  4125.     ff_er_frame_start(s);

  4126. 

  4127.     v->bits = buf_size * 8;

  4128.     vc1_decode_blocks(v);

  4129. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4130. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4131. //      return -1;

  4132.     ff_er_frame_end(s);

  4133. 

  4134.     MPV_frame_end(s);

  4135. 

  4136. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4137. assert(s->current_picture.pict_type == s->pict_type);

  4138.     if (s->pict_type == B_TYPE || s->low_delay) {

  4139.         *pict= *(AVFrame*)s->current_picture_ptr;

  4140.     } else if (s->last_picture_ptr != NULL) {

  4141.         *pict= *(AVFrame*)s->last_picture_ptr;

  4142.     }

  4143. 

  4144.     if(s->last_picture_ptr || s->low_delay){

  4145.         *data_size = sizeof(AVFrame);

  4146.         ff_print_debug_info(s, pict);

  4147.     }

  4148. 

  4149.     /* Return the Picture timestamp as the frame number */

  4150.     /* we substract 1 because it is added on utils.c    */

  4151.     avctx->frame_number = s->picture_number - 1;

  4152. 

  4153.     av_free(buf2);

  4154.     return buf_size;

  4155. }

  4156. 

  4157. 

  4158. /** Close a VC1/WMV3 decoder

  4159.  * @warning Initial try at using MpegEncContext stuff

  4160.  */

  4161. static int vc1_decode_end(AVCodecContext *avctx)

  4162. {

  4163.     VC1Context *v = avctx->priv_data;

  4164. 

  4165.     av_freep(&v->hrd_rate);

  4166.     av_freep(&v->hrd_buffer);

  4167.     MPV_common_end(&v->s);

  4168.     av_freep(&v->mv_type_mb_plane);

  4169.     av_freep(&v->direct_mb_plane);

  4170.     av_freep(&v->acpred_plane);

  4171.     av_freep(&v->over_flags_plane);

  4172.     av_freep(&v->mb_type_base);

  4173.     return 0;

  4174. }

  4175. 

  4176. 

  4177. AVCodec vc1_decoder = {

  4178.     "vc1",

  4179.     CODEC_TYPE_VIDEO,

  4180.     CODEC_ID_VC1,

  4181.     sizeof(VC1Context),

  4182.     vc1_decode_init,

  4183.     NULL,

  4184.     vc1_decode_end,

  4185.     vc1_decode_frame,

  4186.     CODEC_CAP_DELAY,

  4187.     NULL

  4188. };

  4189. 

  4190. AVCodec wmv3_decoder = {

  4191.     "wmv3",

  4192.     CODEC_TYPE_VIDEO,

  4193.     CODEC_ID_WMV3,

  4194.     sizeof(VC1Context),

  4195.     vc1_decode_init,

  4196.     NULL,

  4197.     vc1_decode_end,

  4198.     vc1_decode_frame,

  4199.     CODEC_CAP_DELAY,

  4200.     NULL

  4201. };