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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 "common.h"

  30. #include "dsputil.h"

  31. #include "avcodec.h"

  32. #include "mpegvideo.h"

  33. #include "vc1data.h"

  34. #include "vc1acdata.h"

  35. #include "vc1.h"

  36. 

  37. #undef NDEBUG

  38. #include <assert.h>

  39. 

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

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

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

  43. #define MB_INTRA_VLC_BITS 9

  44. extern VLC ff_msmp4_mb_i_vlc;

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

  46. #define DC_VLC_BITS 9

  47. #define AC_VLC_BITS 9

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

  49. 

  50. 

  51. /**

  52.  * Get unary code of limited length

  53.  * @fixme FIXME Slow and ugly

  54.  * @param gb GetBitContext

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

  56.  * @param[in] len Maximum length

  57.  * @return Unary length/index

  58.  */

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

  60. {

  61. #if 1

  62.     int i;

  63. 

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

  65.     return i;

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

  67. 

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

  69.   {

  70.     tmp = get_bits(gb, 1);

  71.     i++;

  72.   }

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

  74.   return i;*/

  75. #else

  76.   unsigned int buf;

  77.   int log;

  78. 

  79.   OPEN_READER(re, gb);

  80.   UPDATE_CACHE(re, gb);

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

  82.   if (stop) buf = ~buf;

  83. 

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

  85.   if (log < limit){

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

  87.     CLOSE_READER(re, gb);

  88.     return log;

  89.   }

  90. 

  91.   LAST_SKIP_BITS(re, gb, limit);

  92.   CLOSE_READER(re, gb);

  93.   return limit;

  94. #endif

  95. }

  96. 

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

  98.     int n;

  99.     n = get_bits1(gb);

  100.     if (n == 1)

  101.         return 0;

  102.     else

  103.         return 2 - get_bits1(gb);

  104. }

  105. 

  106. /**

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

  108.  * @param v The VC1Context to initialize

  109.  * @return Status

  110.  */

  111. static int vc1_init_common(VC1Context *v)

  112. {

  113.     static int done = 0;

  114.     int i = 0;

  115. 

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

  117. 

  118.     /* VLC tables */

  119.     if(!done)

  120.     {

  121.         done = 1;

  122.         init_vlc(&vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  123.                  vc1_bfraction_bits, 1, 1,

  124.                  vc1_bfraction_codes, 1, 1, 1);

  125.         init_vlc(&vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  126.                  vc1_norm2_bits, 1, 1,

  127.                  vc1_norm2_codes, 1, 1, 1);

  128.         init_vlc(&vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  129.                  vc1_norm6_bits, 1, 1,

  130.                  vc1_norm6_codes, 2, 2, 1);

  131.         init_vlc(&vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  132.                  vc1_imode_bits, 1, 1,

  133.                  vc1_imode_codes, 1, 1, 1);

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

  135.         {

  136.             init_vlc(&vc1_ttmb_vlc[i], VC1_TTMB_VLC_BITS, 16,

  137.                      vc1_ttmb_bits[i], 1, 1,

  138.                      vc1_ttmb_codes[i], 2, 2, 1);

  139.             init_vlc(&vc1_ttblk_vlc[i], VC1_TTBLK_VLC_BITS, 8,

  140.                      vc1_ttblk_bits[i], 1, 1,

  141.                      vc1_ttblk_codes[i], 1, 1, 1);

  142.             init_vlc(&vc1_subblkpat_vlc[i], VC1_SUBBLKPAT_VLC_BITS, 15,

  143.                      vc1_subblkpat_bits[i], 1, 1,

  144.                      vc1_subblkpat_codes[i], 1, 1, 1);

  145.         }

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

  147.         {

  148.             init_vlc(&vc1_4mv_block_pattern_vlc[i], VC1_4MV_BLOCK_PATTERN_VLC_BITS, 16,

  149.                      vc1_4mv_block_pattern_bits[i], 1, 1,

  150.                      vc1_4mv_block_pattern_codes[i], 1, 1, 1);

  151.             init_vlc(&vc1_cbpcy_p_vlc[i], VC1_CBPCY_P_VLC_BITS, 64,

  152.                      vc1_cbpcy_p_bits[i], 1, 1,

  153.                      vc1_cbpcy_p_codes[i], 2, 2, 1);

  154.             init_vlc(&vc1_mv_diff_vlc[i], VC1_MV_DIFF_VLC_BITS, 73,

  155.                      vc1_mv_diff_bits[i], 1, 1,

  156.                      vc1_mv_diff_codes[i], 2, 2, 1);

  157.         }

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

  159.             init_vlc(&vc1_ac_coeff_table[i], AC_VLC_BITS, vc1_ac_sizes[i],

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

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

  162.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  165.     }

  166. 

  167.     /* Other defaults */

  168.     v->pq = -1;

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

  170. 

  171.     return 0;

  172. }

  173. 

  174. /***********************************************************************/

  175. /**

  176.  * @defgroup bitplane VC9 Bitplane decoding

  177.  * @see 8.7, p56

  178.  * @{

  179.  */

  180. 

  181. /** @addtogroup bitplane

  182.  * Imode types

  183.  * @{

  184.  */

  185. enum Imode {

  186.     IMODE_RAW,

  187.     IMODE_NORM2,

  188.     IMODE_DIFF2,

  189.     IMODE_NORM6,

  190.     IMODE_DIFF6,

  191.     IMODE_ROWSKIP,

  192.     IMODE_COLSKIP

  193. };

  194. /** @} */ //imode defines

  195. 

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

  197.  * @param plane Buffer to store decoded bits

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

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

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

  201.  */

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

  203.     int x, y;

  204. 

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

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

  207.             memset(plane, 0, width);

  208.         else

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

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

  211.         plane += stride;

  212.     }

  213. }

  214. 

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

  216.  * @param plane Buffer to store decoded bits

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

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

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

  220.  * @fixme FIXME: Optimize

  221.  */

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

  223.     int x, y;

  224. 

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

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

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

  228.                 plane[y*stride] = 0;

  229.         else

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

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

  232.         plane ++;

  233.     }

  234. }

  235. 

  236. /** Decode a bitplane's bits

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

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

  239.  * @return Status

  240.  * @fixme FIXME: Optimize

  241.  */

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

  243. {

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

  245. 

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

  247.     uint8_t invert, *planep = data;

  248.     int width, height, stride;

  249. 

  250.     width = v->s.mb_width;

  251.     height = v->s.mb_height;

  252.     stride = v->s.mb_stride;

  253.     invert = get_bits(gb, 1);

  254.     imode = get_vlc2(gb, vc1_imode_vlc.table, VC1_IMODE_VLC_BITS, 1);

  255. 

  256.     *raw_flag = 0;

  257.     switch (imode)

  258.     {

  259.     case IMODE_RAW:

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

  261.         *raw_flag = 1; //invert ignored

  262.         return invert;

  263.     case IMODE_DIFF2:

  264.     case IMODE_NORM2:

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

  266.         {

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

  268.             offset = 1;

  269.         }

  270.         else offset = 0;

  271.         // decode bitplane as one long line

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

  273.             code = get_vlc2(gb, vc1_norm2_vlc.table, VC1_NORM2_VLC_BITS, 1);

  274.             *planep++ = code & 1;

  275.             offset++;

  276.             if(offset == width) {

  277.                 offset = 0;

  278.                 planep += stride - width;

  279.             }

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

  281.             offset++;

  282.             if(offset == width) {

  283.                 offset = 0;

  284.                 planep += stride - width;

  285.             }

  286.         }

  287.         break;

  288.     case IMODE_DIFF6:

  289.     case IMODE_NORM6:

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

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

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

  293.                     code = get_vlc2(gb, vc1_norm6_vlc.table, VC1_NORM6_VLC_BITS, 2);

  294.                     if(code < 0){

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

  296.                         return -1;

  297.                     }

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

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

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

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

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

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

  304.                 }

  305.                 planep += stride * 3;

  306.             }

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

  308.         } else { // 3x2

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

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

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

  312.                     code = get_vlc2(gb, vc1_norm6_vlc.table, VC1_NORM6_VLC_BITS, 2);

  313.                     if(code < 0){

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

  315.                         return -1;

  316.                     }

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

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

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

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

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

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

  323.                 }

  324.                 planep += stride * 2;

  325.             }

  326.             x = width % 3;

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

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

  329.         }

  330.         break;

  331.     case IMODE_ROWSKIP:

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

  333.         break;

  334.     case IMODE_COLSKIP:

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

  336.         break;

  337.     default: break;

  338.     }

  339. 

  340.     /* Applying diff operator */

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

  342.     {

  343.         planep = data;

  344.         planep[0] ^= invert;

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

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

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

  348.         {

  349.             planep += stride;

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

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

  352.             {

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

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

  355.             }

  356.         }

  357.     }

  358.     else if (invert)

  359.     {

  360.         planep = data;

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

  362.     }

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

  364. }

  365. 

  366. /** @} */ //Bitplane group

  367. 

  368. /***********************************************************************/

  369. /** VOP Dquant decoding

  370.  * @param v VC-1 Context

  371.  */

  372. static int vop_dquant_decoding(VC1Context *v)

  373. {

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

  375.     int pqdiff;

  376. 

  377.     //variable size

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

  379.     {

  380.         pqdiff = get_bits(gb, 3);

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

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

  383.     }

  384.     else

  385.     {

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

  387.         if ( v->dquantfrm )

  388.         {

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

  390.             switch (v->dqprofile)

  391.             {

  392.             case DQPROFILE_SINGLE_EDGE:

  393.             case DQPROFILE_DOUBLE_EDGES:

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

  395.                 break;

  396.             case DQPROFILE_ALL_MBS:

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

  398.             default: break; //Forbidden ?

  399.             }

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

  401.             {

  402.                 pqdiff = get_bits(gb, 3);

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

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

  405.             }

  406.         }

  407.     }

  408.     return 0;

  409. }

  410. 

  411. /** Put block onto picture

  412.  */

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

  414. {

  415.     uint8_t *Y;

  416.     int ys, us, vs;

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

  418. 

  419.     if(v->rangeredfrm) {

  420.         int i, j, k;

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

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

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

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

  425. 

  426.     }

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

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

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

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

  431. 

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

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

  434.     Y += ys * 8;

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

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

  437. 

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

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

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

  441.     }

  442. }

  443. 

  444. /** Do motion compensation over 1 macroblock

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

  446.  */

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

  448. {

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

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

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

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

  453. 

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

  455. 

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

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

  458. 

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

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

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

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

  463.     }

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

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

  466.     if(v->fastuvmc) {

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

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

  469.     }

  470.     if(!dir) {

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

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

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

  474.     } else {

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

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

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

  478.     }

  479. 

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

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

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

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

  484. 

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

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

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

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

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

  490.     }else{

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

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

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

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

  495.     }

  496. 

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

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

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

  500. 

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

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

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

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

  505.     }

  506. 

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

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

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

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

  511. 

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

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

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

  515.         srcY = s->edge_emu_buffer;

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

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

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

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

  520.         srcU = uvbuf;

  521.         srcV = uvbuf + 16;

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

  523.         if(v->rangeredfrm) {

  524.             int i, j;

  525.             uint8_t *src, *src2;

  526. 

  527.             src = srcY;

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

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

  530.                 src += s->linesize;

  531.             }

  532.             src = srcU; src2 = srcV;

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

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

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

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

  537.                 }

  538.                 src += s->uvlinesize;

  539.                 src2 += s->uvlinesize;

  540.             }

  541.         }

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

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

  544.             int i, j;

  545.             uint8_t *src, *src2;

  546. 

  547.             src = srcY;

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

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

  550.                 src += s->linesize;

  551.             }

  552.             src = srcU; src2 = srcV;

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

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

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

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

  557.                 }

  558.                 src += s->uvlinesize;

  559.                 src2 += s->uvlinesize;

  560.             }

  561.         }

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

  563.     }

  564. 

  565.     if(s->mspel) {

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

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

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

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

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

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

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

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

  574. 

  575.         if(!v->rnd)

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

  577.         else

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

  579.     }

  580. 

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

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

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

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

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

  586.     if(!v->rnd){

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

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

  589.     }else{

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

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

  592.     }

  593. }

  594. 

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

  596.  */

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

  598. {

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

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

  601.     uint8_t *srcY;

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

  603.     int off;

  604. 

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

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

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

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

  609. 

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

  611. 

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

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

  614. 

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

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

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

  618.     }else{

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

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

  621.     }

  622. 

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

  624. 

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

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

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

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

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

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

  631.         srcY = s->edge_emu_buffer;

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

  633.         if(v->rangeredfrm) {

  634.             int i, j;

  635.             uint8_t *src;

  636. 

  637.             src = srcY;

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

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

  640.                 src += s->linesize;

  641.             }

  642.         }

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

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

  645.             int i, j;

  646.             uint8_t *src;

  647. 

  648.             src = srcY;

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

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

  651.                 src += s->linesize;

  652.             }

  653.         }

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

  655.     }

  656. 

  657.     if(s->mspel) {

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

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

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

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

  662.         if(!v->rnd)

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

  664.         else

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

  666.     }

  667. }

  668. 

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

  670. {

  671.     if(a < b) {

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

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

  674.     } else {

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

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

  677.     }

  678. }

  679. 

  680. 

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

  682.  */

  683. static void vc1_mc_4mv_chroma(VC1Context *v)

  684. {

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

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

  687.     uint8_t *srcU, *srcV;

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

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

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

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

  692. 

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

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

  695. 

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

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

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

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

  700.     }

  701. 

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

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

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

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

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

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

  708.         switch(idx) {

  709.         case 0x1:

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

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

  712.             break;

  713.         case 0x2:

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

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

  716.             break;

  717.         case 0x4:

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

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

  720.             break;

  721.         case 0x8:

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

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

  724.             break;

  725.         }

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

  727.         int t1 = 0, t2 = 0;

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

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

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

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

  732.     } else {

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

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

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

  736.     }

  737. 

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

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

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

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

  742.     if(v->fastuvmc) {

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

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

  745.     }

  746. 

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

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

  749. 

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

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

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

  753.     }else{

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

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

  756.     }

  757. 

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

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

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

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

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

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

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

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

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

  767.         srcU = s->edge_emu_buffer;

  768.         srcV = s->edge_emu_buffer + 16;

  769. 

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

  771.         if(v->rangeredfrm) {

  772.             int i, j;

  773.             uint8_t *src, *src2;

  774. 

  775.             src = srcU; src2 = srcV;

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

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

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

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

  780.                 }

  781.                 src += s->uvlinesize;

  782.                 src2 += s->uvlinesize;

  783.             }

  784.         }

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

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

  787.             int i, j;

  788.             uint8_t *src, *src2;

  789. 

  790.             src = srcU; src2 = srcV;

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

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

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

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

  795.                 }

  796.                 src += s->uvlinesize;

  797.                 src2 += s->uvlinesize;

  798.             }

  799.         }

  800.     }

  801. 

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

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

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

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

  806.     if(!v->rnd){

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

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

  809.     }else{

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

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

  812.     }

  813. }

  814. 

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

  816. 

  817. /**

  818.  * Decode Simple/Main Profiles sequence header

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

  820.  * @param avctx Codec context

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

  822.  * @return Status

  823.  */

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

  825. {

  826.     VC1Context *v = avctx->priv_data;

  827. 

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

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

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

  831.     {

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

  833.     }

  834. 

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

  836.     {

  837.         return decode_sequence_header_adv(v, gb);

  838.     }

  839.     else

  840.     {

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

  842.         if (v->res_sm)

  843.         {

  844.             av_log(avctx, AV_LOG_ERROR,

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

  846.             return -1;

  847.         }

  848.     }

  849. 

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

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

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

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

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

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

  856.     {

  857.         av_log(avctx, AV_LOG_ERROR,

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

  859.     }

  860. 

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

  862.     if (v->res_x8)

  863.     {

  864.         av_log(avctx, AV_LOG_ERROR,

  865.                "1 for reserved RES_X8 is forbidden\n");

  866.         //return -1;

  867.     }

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

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

  870.     if (!v->res_fasttx)

  871.     {

  872.         av_log(avctx, AV_LOG_ERROR,

  873.                "0 for reserved RES_FASTTX is forbidden\n");

  874.         //return -1;

  875.     }

  876. 

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

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

  879.     {

  880.         av_log(avctx, AV_LOG_ERROR,

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

  882.         return -1;

  883.     }

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

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

  886.     {

  887.         av_log(avctx, AV_LOG_ERROR,

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

  889.         return -1;

  890.     }

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

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

  893. 

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

  895.     if (v->res_transtab)

  896.     {

  897.         av_log(avctx, AV_LOG_ERROR,

  898.                "1 for reserved RES_TRANSTAB is forbidden\n");

  899.         return -1;

  900.     }

  901. 

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

  903. 

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

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

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

  907.     {

  908.         av_log(avctx, AV_LOG_INFO,

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

  910.     }

  911. 

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

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

  914. 

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

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

  917.     if (!v->res_rtm_flag)

  918.     {

  919. //            av_log(avctx, AV_LOG_ERROR,

  920. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  921.         av_log(avctx, AV_LOG_ERROR,

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

  923.         //return -1;

  924.     }

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

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

  927.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  936.                );

  937.     return 0;

  938. }

  939. 

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

  941. {

  942.     v->res_rtm_flag = 1;

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

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

  945.     {

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

  947.     }

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

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

  950.     {

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

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

  953.         return -1;

  954.     }

  955. 

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

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

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

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

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

  961. 

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

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

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

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

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

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

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

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

  970.     get_bits1(gb); // reserved

  971. 

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

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

  974. 

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

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

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

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

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

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

  981.                v->tfcntrflag, v->finterpflag

  982.                );

  983. 

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

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

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

  987.         return -1;

  988.     }

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

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

  991.         int w, h, ar = 0;

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

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

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

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

  996.         if(get_bits1(gb))

  997.             ar = get_bits(gb, 4);

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

  999.             v->s.avctx->sample_aspect_ratio = vc1_pixel_aspect[ar];

  1000.         }else if(ar == 15){

  1001.             w = get_bits(gb, 8);

  1002.             h = get_bits(gb, 8);

  1003.             v->s.avctx->sample_aspect_ratio = (AVRational){w, h};

  1004.         }

  1005. 

  1006.         if(get_bits1(gb)){ //framerate stuff

  1007.             if(get_bits1(gb)) {

  1008.                 v->s.avctx->time_base.num = 32;

  1009.                 v->s.avctx->time_base.den = get_bits(gb, 16) + 1;

  1010.             } else {

  1011.                 int nr, dr;

  1012.                 nr = get_bits(gb, 8);

  1013.                 dr = get_bits(gb, 4);

  1014.                 if(nr && nr < 8 && dr && dr < 3){

  1015.                     v->s.avctx->time_base.num = fps_dr[dr - 1];

  1016.                     v->s.avctx->time_base.den = fps_nr[nr - 1] * 1000;

  1017.                 }

  1018.             }

  1019.         }

  1020. 

  1021.         if(get_bits1(gb)){

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

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

  1024.             v->matrix_coef = get_bits(gb, 8);

  1025.         }

  1026.     }

  1027. 

  1028.     v->hrd_param_flag = get_bits1(gb);

  1029.     if(v->hrd_param_flag) {

  1030.         int i;

  1031.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  1032.         get_bits(gb, 4); //bitrate exponent

  1033.         get_bits(gb, 4); //buffer size exponent

  1034.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

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

  1036.             get_bits(gb, 16); //hrd_buffer[n]

  1037.         }

  1038.     }

  1039.     return 0;

  1040. }

  1041. 

  1042. static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)

  1043. {

  1044.     VC1Context *v = avctx->priv_data;

  1045.     int i, blink, clentry, refdist;

  1046. 

  1047.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  1048.     blink = get_bits1(gb); // broken link

  1049.     clentry = get_bits1(gb); // closed entry

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

  1051.     refdist = get_bits1(gb); // refdist flag

  1052.     v->s.loop_filter = get_bits1(gb);

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

  1054.     v->extended_mv = get_bits1(gb);

  1055.     v->dquant = get_bits(gb, 2);

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

  1057.     v->overlap = get_bits1(gb);

  1058.     v->quantizer_mode = get_bits(gb, 2);

  1059. 

  1060.     if(v->hrd_param_flag){

  1061.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1062.             get_bits(gb, 8); //hrd_full[n]

  1063.         }

  1064.     }

  1065. 

  1066.     if(get_bits1(gb)){

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

  1068.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1069.     }

  1070.     if(v->extended_mv)

  1071.         v->extended_dmv = get_bits1(gb);

  1072.     if(get_bits1(gb)) {

  1073.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1074.         skip_bits(gb, 3); // Y range, ignored for now

  1075.     }

  1076.     if(get_bits1(gb)) {

  1077.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1078.         skip_bits(gb, 3); // UV range, ignored for now

  1079.     }

  1080. 

  1081.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1082.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1083.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1084.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1085.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1086.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1087. 

  1088.     return 0;

  1089. }

  1090. 

  1091. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1092. {

  1093.     int pqindex, lowquant, status;

  1094. 

  1095.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1096.     skip_bits(gb, 2); //framecnt unused

  1097.     v->rangeredfrm = 0;

  1098.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1099.     v->s.pict_type = get_bits(gb, 1);

  1100.     if (v->s.avctx->max_b_frames) {

  1101.         if (!v->s.pict_type) {

  1102.             if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;

  1103.             else v->s.pict_type = B_TYPE;

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

  1105.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1106. 

  1107.     v->bi_type = 0;

  1108.     if(v->s.pict_type == B_TYPE) {

  1109.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1110.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1111.         if(v->bfraction == 0) {

  1112.             v->s.pict_type = BI_TYPE;

  1113.         }

  1114.     }

  1115.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1116.         get_bits(gb, 7); // skip buffer fullness

  1117. 

  1118.     /* calculate RND */

  1119.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1120.         v->rnd = 1;

  1121.     if(v->s.pict_type == P_TYPE)

  1122.         v->rnd ^= 1;

  1123. 

  1124.     /* Quantizer stuff */

  1125.     pqindex = get_bits(gb, 5);

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

  1127.         v->pq = pquant_table[0][pqindex];

  1128.     else

  1129.         v->pq = pquant_table[1][pqindex];

  1130. 

  1131.     v->pquantizer = 1;

  1132.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1133.         v->pquantizer = pqindex < 9;

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

  1135.         v->pquantizer = 0;

  1136.     v->pqindex = pqindex;

  1137.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1138.     else v->halfpq = 0;

  1139.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1140.         v->pquantizer = get_bits(gb, 1);

  1141.     v->dquantfrm = 0;

  1142.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1143.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1144.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1145.     v->range_x = 1 << (v->k_x - 1);

  1146.     v->range_y = 1 << (v->k_y - 1);

  1147.     if (v->profile == PROFILE_ADVANCED)

  1148.     {

  1149.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1150.     }

  1151.     else

  1152.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1153. 

  1154.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1155.         if(get_bits1(gb))return -1;

  1156.     }

  1157. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1158. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1159. 

  1160.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1161. 

  1162.     switch(v->s.pict_type) {

  1163.     case P_TYPE:

  1164.         if (v->pq < 5) v->tt_index = 0;

  1165.         else if(v->pq < 13) v->tt_index = 1;

  1166.         else v->tt_index = 2;

  1167. 

  1168.         lowquant = (v->pq > 12) ? 0 : 1;

  1169.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1170.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1171.         {

  1172.             int scale, shift, i;

  1173.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

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

  1175.             v->lumshift = get_bits(gb, 6);

  1176.             v->use_ic = 1;

  1177.             /* fill lookup tables for intensity compensation */

  1178.             if(!v->lumscale) {

  1179.                 scale = -64;

  1180.                 shift = (255 - v->lumshift * 2) << 6;

  1181.                 if(v->lumshift > 31)

  1182.                     shift += 128 << 6;

  1183.             } else {

  1184.                 scale = v->lumscale + 32;

  1185.                 if(v->lumshift > 31)

  1186.                     shift = (v->lumshift - 64) << 6;

  1187.                 else

  1188.                     shift = v->lumshift << 6;

  1189.             }

  1190.             for(i = 0; i < 256; i++) {

  1191.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1192.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1193.             }

  1194.         }

  1195.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1196.             v->s.quarter_sample = 0;

  1197.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1198.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1199.                 v->s.quarter_sample = 0;

  1200.             else

  1201.                 v->s.quarter_sample = 1;

  1202.         } else

  1203.             v->s.quarter_sample = 1;

  1204.         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));

  1205. 

  1206.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1207.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1208.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1209.         {

  1210.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1211.             if (status < 0) return -1;

  1212.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1213.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1214.         } else {

  1215.             v->mv_type_is_raw = 0;

  1216.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1217.         }

  1218.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1219.         if (status < 0) return -1;

  1220.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1221.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1222. 

  1223.         /* Hopefully this is correct for P frames */

  1224.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1225.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1226. 

  1227.         if (v->dquant)

  1228.         {

  1229.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1230.             vop_dquant_decoding(v);

  1231.         }

  1232. 

  1233.         v->ttfrm = 0; //FIXME Is that so ?

  1234.         if (v->vstransform)

  1235.         {

  1236.             v->ttmbf = get_bits(gb, 1);

  1237.             if (v->ttmbf)

  1238.             {

  1239.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1240.             }

  1241.         } else {

  1242.             v->ttmbf = 1;

  1243.             v->ttfrm = TT_8X8;

  1244.         }

  1245.         break;

  1246.     case B_TYPE:

  1247.         if (v->pq < 5) v->tt_index = 0;

  1248.         else if(v->pq < 13) v->tt_index = 1;

  1249.         else v->tt_index = 2;

  1250. 

  1251.         lowquant = (v->pq > 12) ? 0 : 1;

  1252.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1253.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1254.         v->s.mspel = v->s.quarter_sample;

  1255. 

  1256.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1257.         if (status < 0) return -1;

  1258.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1259.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1260.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1261.         if (status < 0) return -1;

  1262.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1263.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1264. 

  1265.         v->s.mv_table_index = get_bits(gb, 2);

  1266.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1267. 

  1268.         if (v->dquant)

  1269.         {

  1270.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1271.             vop_dquant_decoding(v);

  1272.         }

  1273. 

  1274.         v->ttfrm = 0;

  1275.         if (v->vstransform)

  1276.         {

  1277.             v->ttmbf = get_bits(gb, 1);

  1278.             if (v->ttmbf)

  1279.             {

  1280.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1281.             }

  1282.         } else {

  1283.             v->ttmbf = 1;

  1284.             v->ttfrm = TT_8X8;

  1285.         }

  1286.         break;

  1287.     }

  1288. 

  1289.     /* AC Syntax */

  1290.     v->c_ac_table_index = decode012(gb);

  1291.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1292.     {

  1293.         v->y_ac_table_index = decode012(gb);

  1294.     }

  1295.     /* DC Syntax */

  1296.     v->s.dc_table_index = get_bits(gb, 1);

  1297. 

  1298.     if(v->s.pict_type == BI_TYPE) {

  1299.         v->s.pict_type = B_TYPE;

  1300.         v->bi_type = 1;

  1301.     }

  1302.     return 0;

  1303. }

  1304. 

  1305. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1306. {

  1307.     int pqindex, lowquant;

  1308.     int status;

  1309. 

  1310.     v->p_frame_skipped = 0;

  1311. 

  1312.     if(v->interlace){

  1313.         v->fcm = decode012(gb);

  1314.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1315.     }

  1316.     switch(get_prefix(gb, 0, 4)) {

  1317.     case 0:

  1318.         v->s.pict_type = P_TYPE;

  1319.         break;

  1320.     case 1:

  1321.         v->s.pict_type = B_TYPE;

  1322.         break;

  1323.     case 2:

  1324.         v->s.pict_type = I_TYPE;

  1325.         break;

  1326.     case 3:

  1327.         v->s.pict_type = BI_TYPE;

  1328.         break;

  1329.     case 4:

  1330.         v->s.pict_type = P_TYPE; // skipped pic

  1331.         v->p_frame_skipped = 1;

  1332.         return 0;

  1333.     }

  1334.     if(v->tfcntrflag)

  1335.         get_bits(gb, 8);

  1336.     if(v->broadcast) {

  1337.         if(!v->interlace || v->psf) {

  1338.             v->rptfrm = get_bits(gb, 2);

  1339.         } else {

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

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

  1342.         }

  1343.     }

  1344.     if(v->panscanflag) {

  1345.         //...

  1346.     }

  1347.     v->rnd = get_bits1(gb);

  1348.     if(v->interlace)

  1349.         v->uvsamp = get_bits1(gb);

  1350.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1351.     if(v->s.pict_type == B_TYPE) {

  1352.         v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1353.         v->bfraction = vc1_bfraction_lut[v->bfraction];

  1354.         if(v->bfraction == 0) {

  1355.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1356.         }

  1357.     }

  1358.     pqindex = get_bits(gb, 5);

  1359.     v->pqindex = pqindex;

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

  1361.         v->pq = pquant_table[0][pqindex];

  1362.     else

  1363.         v->pq = pquant_table[1][pqindex];

  1364. 

  1365.     v->pquantizer = 1;

  1366.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1367.         v->pquantizer = pqindex < 9;

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

  1369.         v->pquantizer = 0;

  1370.     v->pqindex = pqindex;

  1371.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1372.     else v->halfpq = 0;

  1373.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1374.         v->pquantizer = get_bits(gb, 1);

  1375. 

  1376.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1377. 

  1378.     switch(v->s.pict_type) {

  1379.     case I_TYPE:

  1380.     case BI_TYPE:

  1381.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1382.         if (status < 0) return -1;

  1383.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1384.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1385.         v->condover = CONDOVER_NONE;

  1386.         if(v->overlap && v->pq <= 8) {

  1387.             v->condover = decode012(gb);

  1388.             if(v->condover == CONDOVER_SELECT) {

  1389.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1390.                 if (status < 0) return -1;

  1391.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1392.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1393.             }

  1394.         }

  1395.         break;

  1396.     case P_TYPE:

  1397.         if(v->postprocflag)

  1398.             v->postproc = get_bits1(gb);

  1399.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1400.         else v->mvrange = 0;

  1401.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1402.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1403.         v->range_x = 1 << (v->k_x - 1);

  1404.         v->range_y = 1 << (v->k_y - 1);

  1405. 

  1406.         if (v->pq < 5) v->tt_index = 0;

  1407.         else if(v->pq < 13) v->tt_index = 1;

  1408.         else v->tt_index = 2;

  1409. 

  1410.         lowquant = (v->pq > 12) ? 0 : 1;

  1411.         v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1412.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1413.         {

  1414.             int scale, shift, i;

  1415.             v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

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

  1417.             v->lumshift = get_bits(gb, 6);

  1418.             /* fill lookup tables for intensity compensation */

  1419.             if(!v->lumscale) {

  1420.                 scale = -64;

  1421.                 shift = (255 - v->lumshift * 2) << 6;

  1422.                 if(v->lumshift > 31)

  1423.                     shift += 128 << 6;

  1424.             } else {

  1425.                 scale = v->lumscale + 32;

  1426.                 if(v->lumshift > 31)

  1427.                     shift = (v->lumshift - 64) << 6;

  1428.                 else

  1429.                     shift = v->lumshift << 6;

  1430.             }

  1431.             for(i = 0; i < 256; i++) {

  1432.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1433.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1434.             }

  1435.             v->use_ic = 1;

  1436.         }

  1437.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1438.             v->s.quarter_sample = 0;

  1439.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1440.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1441.                 v->s.quarter_sample = 0;

  1442.             else

  1443.                 v->s.quarter_sample = 1;

  1444.         } else

  1445.             v->s.quarter_sample = 1;

  1446.         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));

  1447. 

  1448.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1449.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1450.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1451.         {

  1452.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1453.             if (status < 0) return -1;

  1454.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1455.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1456.         } else {

  1457.             v->mv_type_is_raw = 0;

  1458.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1459.         }

  1460.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1461.         if (status < 0) return -1;

  1462.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1463.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1464. 

  1465.         /* Hopefully this is correct for P frames */

  1466.         v->s.mv_table_index = get_bits(gb, 2); //but using vc1_ tables

  1467.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1468.         if (v->dquant)

  1469.         {

  1470.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1471.             vop_dquant_decoding(v);

  1472.         }

  1473. 

  1474.         v->ttfrm = 0; //FIXME Is that so ?

  1475.         if (v->vstransform)

  1476.         {

  1477.             v->ttmbf = get_bits(gb, 1);

  1478.             if (v->ttmbf)

  1479.             {

  1480.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1481.             }

  1482.         } else {

  1483.             v->ttmbf = 1;

  1484.             v->ttfrm = TT_8X8;

  1485.         }

  1486.         break;

  1487.     case B_TYPE:

  1488.         if(v->postprocflag)

  1489.             v->postproc = get_bits1(gb);

  1490.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1491.         else v->mvrange = 0;

  1492.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1493.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1494.         v->range_x = 1 << (v->k_x - 1);

  1495.         v->range_y = 1 << (v->k_y - 1);

  1496. 

  1497.         if (v->pq < 5) v->tt_index = 0;

  1498.         else if(v->pq < 13) v->tt_index = 1;

  1499.         else v->tt_index = 2;

  1500. 

  1501.         lowquant = (v->pq > 12) ? 0 : 1;

  1502.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1503.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1504.         v->s.mspel = v->s.quarter_sample;

  1505. 

  1506.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1507.         if (status < 0) return -1;

  1508.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1509.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1510.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1511.         if (status < 0) return -1;

  1512.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1513.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1514. 

  1515.         v->s.mv_table_index = get_bits(gb, 2);

  1516.         v->cbpcy_vlc = &vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1517. 

  1518.         if (v->dquant)

  1519.         {

  1520.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1521.             vop_dquant_decoding(v);

  1522.         }

  1523. 

  1524.         v->ttfrm = 0;

  1525.         if (v->vstransform)

  1526.         {

  1527.             v->ttmbf = get_bits(gb, 1);

  1528.             if (v->ttmbf)

  1529.             {

  1530.                 v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];

  1531.             }

  1532.         } else {

  1533.             v->ttmbf = 1;

  1534.             v->ttfrm = TT_8X8;

  1535.         }

  1536.         break;

  1537.     }

  1538. 

  1539.     /* AC Syntax */

  1540.     v->c_ac_table_index = decode012(gb);

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

  1542.     {

  1543.         v->y_ac_table_index = decode012(gb);

  1544.     }

  1545.     /* DC Syntax */

  1546.     v->s.dc_table_index = get_bits(gb, 1);

  1547.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1548.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1549.         vop_dquant_decoding(v);

  1550.     }

  1551. 

  1552.     v->bi_type = 0;

  1553.     if(v->s.pict_type == BI_TYPE) {

  1554.         v->s.pict_type = B_TYPE;

  1555.         v->bi_type = 1;

  1556.     }

  1557.     return 0;

  1558. }

  1559. 

  1560. /***********************************************************************/

  1561. /**

  1562.  * @defgroup block VC-1 Block-level functions

  1563.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1564.  * @{

  1565.  */

  1566. 

  1567. /**

  1568.  * @def GET_MQUANT

  1569.  * @brief Get macroblock-level quantizer scale

  1570.  */

  1571. #define GET_MQUANT()                                           \

  1572.   if (v->dquantfrm)                                            \

  1573.   {                                                            \

  1574.     int edges = 0;                                             \

  1575.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1576.     {                                                          \

  1577.       if (v->dqbilevel)                                        \

  1578.       {                                                        \

  1579.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1580.       }                                                        \

  1581.       else                                                     \

  1582.       {                                                        \

  1583.         mqdiff = get_bits(gb, 3);                              \

  1584.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1585.         else mquant = get_bits(gb, 5);                         \

  1586.       }                                                        \

  1587.     }                                                          \

  1588.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1589.         edges = 1 << v->dqsbedge;                              \

  1590.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1591.         edges = (3 << v->dqsbedge) % 15;                       \

  1592.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1593.         edges = 15;                                            \

  1594.     if((edges&1) && !s->mb_x)                                  \

  1595.         mquant = v->altpq;                                     \

  1596.     if((edges&2) && s->first_slice_line)                       \

  1597.         mquant = v->altpq;                                     \

  1598.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1599.         mquant = v->altpq;                                     \

  1600.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1601.         mquant = v->altpq;                                     \

  1602.   }

  1603. 

  1604. /**

  1605.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1606.  * @brief Get MV differentials

  1607.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1608.  * @param _dmv_x Horizontal differential for decoded MV

  1609.  * @param _dmv_y Vertical differential for decoded MV

  1610.  */

  1611. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1612.   index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\

  1613.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1614.   if (index > 36)                                                   \

  1615.   {                                                                 \

  1616.     mb_has_coeffs = 1;                                              \

  1617.     index -= 37;                                                    \

  1618.   }                                                                 \

  1619.   else mb_has_coeffs = 0;                                           \

  1620.   s->mb_intra = 0;                                                  \

  1621.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1622.   else if (index == 35)                                             \

  1623.   {                                                                 \

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

  1625.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1626.   }                                                                 \

  1627.   else if (index == 36)                                             \

  1628.   {                                                                 \

  1629.     _dmv_x = 0;                                                     \

  1630.     _dmv_y = 0;                                                     \

  1631.     s->mb_intra = 1;                                                \

  1632.   }                                                                 \

  1633.   else                                                              \

  1634.   {                                                                 \

  1635.     index1 = index%6;                                               \

  1636.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1637.     else                                   val = 0;                 \

  1638.     if(size_table[index1] - val > 0)                                \

  1639.         val = get_bits(gb, size_table[index1] - val);               \

  1640.     else                                   val = 0;                 \

  1641.     sign = 0 - (val&1);                                             \

  1642.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1643.                                                                     \

  1644.     index1 = index/6;                                               \

  1645.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1646.     else                                   val = 0;                 \

  1647.     if(size_table[index1] - val > 0)                                \

  1648.         val = get_bits(gb, size_table[index1] - val);               \

  1649.     else                                   val = 0;                 \

  1650.     sign = 0 - (val&1);                                             \

  1651.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1652.   }

  1653. 

  1654. /** Predict and set motion vector

  1655.  */

  1656. 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)

  1657. {

  1658.     int xy, wrap, off = 0;

  1659.     int16_t *A, *B, *C;

  1660.     int px, py;

  1661.     int sum;

  1662. 

  1663.     /* scale MV difference to be quad-pel */

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

  1665.     dmv_y <<= 1 - s->quarter_sample;

  1666. 

  1667.     wrap = s->b8_stride;

  1668.     xy = s->block_index[n];

  1669. 

  1670.     if(s->mb_intra){

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

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

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

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

  1675.         if(mv1) { /* duplicate motion data for 1-MV block */

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

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

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

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

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

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

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

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

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

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

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

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

  1688.         }

  1689.         return;

  1690.     }

  1691. 

  1692.     C = s->current_picture.motion_val[0][xy - 1];

  1693.     A = s->current_picture.motion_val[0][xy - wrap];

  1694.     if(mv1)

  1695.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1696.     else {

  1697.         //in 4-MV mode different blocks have different B predictor position

  1698.         switch(n){

  1699.         case 0:

  1700.             off = (s->mb_x > 0) ? -1 : 1;

  1701.             break;

  1702.         case 1:

  1703.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1704.             break;

  1705.         case 2:

  1706.             off = 1;

  1707.             break;

  1708.         case 3:

  1709.             off = -1;

  1710.         }

  1711.     }

  1712.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1713. 

  1714.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1715.         if(s->mb_width == 1) {

  1716.             px = A[0];

  1717.             py = A[1];

  1718.         } else {

  1719.             px = mid_pred(A[0], B[0], C[0]);

  1720.             py = mid_pred(A[1], B[1], C[1]);

  1721.         }

  1722.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1723.         px = C[0];

  1724.         py = C[1];

  1725.     } else {

  1726.         px = py = 0;

  1727.     }

  1728.     /* Pullback MV as specified in 8.3.5.3.4 */

  1729.     {

  1730.         int qx, qy, X, Y;

  1731.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1732.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1733.         X = (s->mb_width << 6) - 4;

  1734.         Y = (s->mb_height << 6) - 4;

  1735.         if(mv1) {

  1736.             if(qx + px < -60) px = -60 - qx;

  1737.             if(qy + py < -60) py = -60 - qy;

  1738.         } else {

  1739.             if(qx + px < -28) px = -28 - qx;

  1740.             if(qy + py < -28) py = -28 - qy;

  1741.         }

  1742.         if(qx + px > X) px = X - qx;

  1743.         if(qy + py > Y) py = Y - qy;

  1744.     }

  1745.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1746.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1747.         if(is_intra[xy - wrap])

  1748.             sum = FFABS(px) + FFABS(py);

  1749.         else

  1750.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1751.         if(sum > 32) {

  1752.             if(get_bits1(&s->gb)) {

  1753.                 px = A[0];

  1754.                 py = A[1];

  1755.             } else {

  1756.                 px = C[0];

  1757.                 py = C[1];

  1758.             }

  1759.         } else {

  1760.             if(is_intra[xy - 1])

  1761.                 sum = FFABS(px) + FFABS(py);

  1762.             else

  1763.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1764.             if(sum > 32) {

  1765.                 if(get_bits1(&s->gb)) {

  1766.                     px = A[0];

  1767.                     py = A[1];

  1768.                 } else {

  1769.                     px = C[0];

  1770.                     py = C[1];

  1771.                 }

  1772.             }

  1773.         }

  1774.     }

  1775.     /* store MV using signed modulus of MV range defined in 4.11 */

  1776.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1777.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1778.     if(mv1) { /* duplicate motion data for 1-MV block */

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

  1780.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

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

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

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

  1784.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1785.     }

  1786. }

  1787. 

  1788. /** Motion compensation for direct or interpolated blocks in B-frames

  1789.  */

  1790. static void vc1_interp_mc(VC1Context *v)

  1791. {

  1792.     MpegEncContext *s = &v->s;

  1793.     DSPContext *dsp = &v->s.dsp;

  1794.     uint8_t *srcY, *srcU, *srcV;

  1795.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1796. 

  1797.     if(!v->s.next_picture.data[0])return;

  1798. 

  1799.     mx = s->mv[1][0][0];

  1800.     my = s->mv[1][0][1];

  1801.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1802.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1803.     if(v->fastuvmc) {

  1804.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  1805.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  1806.     }

  1807.     srcY = s->next_picture.data[0];

  1808.     srcU = s->next_picture.data[1];

  1809.     srcV = s->next_picture.data[2];

  1810. 

  1811.     src_x = s->mb_x * 16 + (mx >> 2);

  1812.     src_y = s->mb_y * 16 + (my >> 2);

  1813.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1814.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1815. 

  1816.     if(v->profile != PROFILE_ADVANCED){

  1817.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1818.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1819.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1820.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1821.     }else{

  1822.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1823.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1824.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1825.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1826.     }

  1827. 

  1828.     srcY += src_y * s->linesize + src_x;

  1829.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1830.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1831. 

  1832.     /* for grayscale we should not try to read from unknown area */

  1833.     if(s->flags & CODEC_FLAG_GRAY) {

  1834.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1835.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1836.     }

  1837. 

  1838.     if(v->rangeredfrm

  1839.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1840.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1841.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1842. 

  1843.         srcY -= s->mspel * (1 + s->linesize);

  1844.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  1845.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1846.         srcY = s->edge_emu_buffer;

  1847.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1848.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1849.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1850.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1851.         srcU = uvbuf;

  1852.         srcV = uvbuf + 16;

  1853.         /* if we deal with range reduction we need to scale source blocks */

  1854.         if(v->rangeredfrm) {

  1855.             int i, j;

  1856.             uint8_t *src, *src2;

  1857. 

  1858.             src = srcY;

  1859.             for(j = 0; j < 17 + s->mspel*2; j++) {

  1860.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1861.                 src += s->linesize;

  1862.             }

  1863.             src = srcU; src2 = srcV;

  1864.             for(j = 0; j < 9; j++) {

  1865.                 for(i = 0; i < 9; i++) {

  1866.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1867.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1868.                 }

  1869.                 src += s->uvlinesize;

  1870.                 src2 += s->uvlinesize;

  1871.             }

  1872.         }

  1873.         srcY += s->mspel * (1 + s->linesize);

  1874.     }

  1875. 

  1876.     mx >>= 1;

  1877.     my >>= 1;

  1878.     dxy = ((my & 1) << 1) | (mx & 1);

  1879. 

  1880.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1881. 

  1882.     if(s->flags & CODEC_FLAG_GRAY) return;

  1883.     /* Chroma MC always uses qpel blilinear */

  1884.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1885.     uvmx = (uvmx&3)<<1;

  1886.     uvmy = (uvmy&3)<<1;

  1887.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1888.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1889. }

  1890. 

  1891. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1892. {

  1893.     int n = bfrac;

  1894. 

  1895. #if B_FRACTION_DEN==256

  1896.     if(inv)

  1897.         n -= 256;

  1898.     if(!qs)

  1899.         return 2 * ((value * n + 255) >> 9);

  1900.     return (value * n + 128) >> 8;

  1901. #else

  1902.     if(inv)

  1903.         n -= B_FRACTION_DEN;

  1904.     if(!qs)

  1905.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1906.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1907. #endif

  1908. }

  1909. 

  1910. /** Reconstruct motion vector for B-frame and do motion compensation

  1911.  */

  1912. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1913. {

  1914.     if(v->use_ic) {

  1915.         v->mv_mode2 = v->mv_mode;

  1916.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  1917.     }

  1918.     if(direct) {

  1919.         vc1_mc_1mv(v, 0);

  1920.         vc1_interp_mc(v);

  1921.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1922.         return;

  1923.     }

  1924.     if(mode == BMV_TYPE_INTERPOLATED) {

  1925.         vc1_mc_1mv(v, 0);

  1926.         vc1_interp_mc(v);

  1927.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1928.         return;

  1929.     }

  1930. 

  1931.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  1932.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  1933.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  1934. }

  1935. 

  1936. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  1937. {

  1938.     MpegEncContext *s = &v->s;

  1939.     int xy, wrap, off = 0;

  1940.     int16_t *A, *B, *C;

  1941.     int px, py;

  1942.     int sum;

  1943.     int r_x, r_y;

  1944.     const uint8_t *is_intra = v->mb_type[0];

  1945. 

  1946.     r_x = v->range_x;

  1947.     r_y = v->range_y;

  1948.     /* scale MV difference to be quad-pel */

  1949.     dmv_x[0] <<= 1 - s->quarter_sample;

  1950.     dmv_y[0] <<= 1 - s->quarter_sample;

  1951.     dmv_x[1] <<= 1 - s->quarter_sample;

  1952.     dmv_y[1] <<= 1 - s->quarter_sample;

  1953. 

  1954.     wrap = s->b8_stride;

  1955.     xy = s->block_index[0];

  1956. 

  1957.     if(s->mb_intra) {

  1958.         s->current_picture.motion_val[0][xy][0] =

  1959.         s->current_picture.motion_val[0][xy][1] =

  1960.         s->current_picture.motion_val[1][xy][0] =

  1961.         s->current_picture.motion_val[1][xy][1] = 0;

  1962.         return;

  1963.     }

  1964.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  1965.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  1966.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  1967.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  1968. 

  1969.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  1970.     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));

  1971.     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));

  1972.     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));

  1973.     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));

  1974.     if(direct) {

  1975.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  1976.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  1977.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  1978.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  1979.         return;

  1980.     }

  1981. 

  1982.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  1983.         C = s->current_picture.motion_val[0][xy - 2];

  1984.         A = s->current_picture.motion_val[0][xy - wrap*2];

  1985.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1986.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  1987. 

  1988.         if(!s->mb_x) C[0] = C[1] = 0;

  1989.         if(!s->first_slice_line) { // predictor A is not out of bounds

  1990.             if(s->mb_width == 1) {

  1991.                 px = A[0];

  1992.                 py = A[1];

  1993.             } else {

  1994.                 px = mid_pred(A[0], B[0], C[0]);

  1995.                 py = mid_pred(A[1], B[1], C[1]);

  1996.             }

  1997.         } else if(s->mb_x) { // predictor C is not out of bounds

  1998.             px = C[0];

  1999.             py = C[1];

  2000.         } else {

  2001.             px = py = 0;

  2002.         }

  2003.         /* Pullback MV as specified in 8.3.5.3.4 */

  2004.         {

  2005.             int qx, qy, X, Y;

  2006.             if(v->profile < PROFILE_ADVANCED) {

  2007.                 qx = (s->mb_x << 5);

  2008.                 qy = (s->mb_y << 5);

  2009.                 X = (s->mb_width << 5) - 4;

  2010.                 Y = (s->mb_height << 5) - 4;

  2011.                 if(qx + px < -28) px = -28 - qx;

  2012.                 if(qy + py < -28) py = -28 - qy;

  2013.                 if(qx + px > X) px = X - qx;

  2014.                 if(qy + py > Y) py = Y - qy;

  2015.             } else {

  2016.                 qx = (s->mb_x << 6);

  2017.                 qy = (s->mb_y << 6);

  2018.                 X = (s->mb_width << 6) - 4;

  2019.                 Y = (s->mb_height << 6) - 4;

  2020.                 if(qx + px < -60) px = -60 - qx;

  2021.                 if(qy + py < -60) py = -60 - qy;

  2022.                 if(qx + px > X) px = X - qx;

  2023.                 if(qy + py > Y) py = Y - qy;

  2024.             }

  2025.         }

  2026.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2027.         if(0 && !s->first_slice_line && s->mb_x) {

  2028.             if(is_intra[xy - wrap])

  2029.                 sum = FFABS(px) + FFABS(py);

  2030.             else

  2031.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2032.             if(sum > 32) {

  2033.                 if(get_bits1(&s->gb)) {

  2034.                     px = A[0];

  2035.                     py = A[1];

  2036.                 } else {

  2037.                     px = C[0];

  2038.                     py = C[1];

  2039.                 }

  2040.             } else {

  2041.                 if(is_intra[xy - 2])

  2042.                     sum = FFABS(px) + FFABS(py);

  2043.                 else

  2044.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2045.                 if(sum > 32) {

  2046.                     if(get_bits1(&s->gb)) {

  2047.                         px = A[0];

  2048.                         py = A[1];

  2049.                     } else {

  2050.                         px = C[0];

  2051.                         py = C[1];

  2052.                     }

  2053.                 }

  2054.             }

  2055.         }

  2056.         /* store MV using signed modulus of MV range defined in 4.11 */

  2057.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2058.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2059.     }

  2060.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2061.         C = s->current_picture.motion_val[1][xy - 2];

  2062.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2063.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2064.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2065. 

  2066.         if(!s->mb_x) C[0] = C[1] = 0;

  2067.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2068.             if(s->mb_width == 1) {

  2069.                 px = A[0];

  2070.                 py = A[1];

  2071.             } else {

  2072.                 px = mid_pred(A[0], B[0], C[0]);

  2073.                 py = mid_pred(A[1], B[1], C[1]);

  2074.             }

  2075.         } else if(s->mb_x) { // predictor C is not out of bounds

  2076.             px = C[0];

  2077.             py = C[1];

  2078.         } else {

  2079.             px = py = 0;

  2080.         }

  2081.         /* Pullback MV as specified in 8.3.5.3.4 */

  2082.         {

  2083.             int qx, qy, X, Y;

  2084.             if(v->profile < PROFILE_ADVANCED) {

  2085.                 qx = (s->mb_x << 5);

  2086.                 qy = (s->mb_y << 5);

  2087.                 X = (s->mb_width << 5) - 4;

  2088.                 Y = (s->mb_height << 5) - 4;

  2089.                 if(qx + px < -28) px = -28 - qx;

  2090.                 if(qy + py < -28) py = -28 - qy;

  2091.                 if(qx + px > X) px = X - qx;

  2092.                 if(qy + py > Y) py = Y - qy;

  2093.             } else {

  2094.                 qx = (s->mb_x << 6);

  2095.                 qy = (s->mb_y << 6);

  2096.                 X = (s->mb_width << 6) - 4;

  2097.                 Y = (s->mb_height << 6) - 4;

  2098.                 if(qx + px < -60) px = -60 - qx;

  2099.                 if(qy + py < -60) py = -60 - qy;

  2100.                 if(qx + px > X) px = X - qx;

  2101.                 if(qy + py > Y) py = Y - qy;

  2102.             }

  2103.         }

  2104.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2105.         if(0 && !s->first_slice_line && s->mb_x) {

  2106.             if(is_intra[xy - wrap])

  2107.                 sum = FFABS(px) + FFABS(py);

  2108.             else

  2109.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2110.             if(sum > 32) {

  2111.                 if(get_bits1(&s->gb)) {

  2112.                     px = A[0];

  2113.                     py = A[1];

  2114.                 } else {

  2115.                     px = C[0];

  2116.                     py = C[1];

  2117.                 }

  2118.             } else {

  2119.                 if(is_intra[xy - 2])

  2120.                     sum = FFABS(px) + FFABS(py);

  2121.                 else

  2122.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2123.                 if(sum > 32) {

  2124.                     if(get_bits1(&s->gb)) {

  2125.                         px = A[0];

  2126.                         py = A[1];

  2127.                     } else {

  2128.                         px = C[0];

  2129.                         py = C[1];

  2130.                     }

  2131.                 }

  2132.             }

  2133.         }

  2134.         /* store MV using signed modulus of MV range defined in 4.11 */

  2135. 

  2136.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2137.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2138.     }

  2139.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2140.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2141.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2142.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2143. }

  2144. 

  2145. /** Get predicted DC value for I-frames only

  2146.  * prediction dir: left=0, top=1

  2147.  * @param s MpegEncContext

  2148.  * @param[in] n block index in the current MB

  2149.  * @param dc_val_ptr Pointer to DC predictor

  2150.  * @param dir_ptr Prediction direction for use in AC prediction

  2151.  */

  2152. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2153.                               int16_t **dc_val_ptr, int *dir_ptr)

  2154. {

  2155.     int a, b, c, wrap, pred, scale;

  2156.     int16_t *dc_val;

  2157.     static const uint16_t dcpred[32] = {

  2158.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2159.          114,  102,   93,   85,   79,   73,   68,   64,

  2160.           60,   57,   54,   51,   49,   47,   45,   43,

  2161.           41,   39,   38,   37,   35,   34,   33

  2162.     };

  2163. 

  2164.     /* find prediction - wmv3_dc_scale always used here in fact */

  2165.     if (n < 4)     scale = s->y_dc_scale;

  2166.     else           scale = s->c_dc_scale;

  2167. 

  2168.     wrap = s->block_wrap[n];

  2169.     dc_val= s->dc_val[0] + s->block_index[n];

  2170. 

  2171.     /* B A

  2172.      * C X

  2173.      */

  2174.     c = dc_val[ - 1];

  2175.     b = dc_val[ - 1 - wrap];

  2176.     a = dc_val[ - wrap];

  2177. 

  2178.     if (pq < 9 || !overlap)

  2179.     {

  2180.         /* Set outer values */

  2181.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2182.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2183.     }

  2184.     else

  2185.     {

  2186.         /* Set outer values */

  2187.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2188.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2189.     }

  2190. 

  2191.     if (abs(a - b) <= abs(b - c)) {

  2192.         pred = c;

  2193.         *dir_ptr = 1;//left

  2194.     } else {

  2195.         pred = a;

  2196.         *dir_ptr = 0;//top

  2197.     }

  2198. 

  2199.     /* update predictor */

  2200.     *dc_val_ptr = &dc_val[0];

  2201.     return pred;

  2202. }

  2203. 

  2204. 

  2205. /** Get predicted DC value

  2206.  * prediction dir: left=0, top=1

  2207.  * @param s MpegEncContext

  2208.  * @param[in] n block index in the current MB

  2209.  * @param dc_val_ptr Pointer to DC predictor

  2210.  * @param dir_ptr Prediction direction for use in AC prediction

  2211.  */

  2212. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2213.                               int a_avail, int c_avail,

  2214.                               int16_t **dc_val_ptr, int *dir_ptr)

  2215. {

  2216.     int a, b, c, wrap, pred, scale;

  2217.     int16_t *dc_val;

  2218.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2219.     int q1, q2 = 0;

  2220. 

  2221.     /* find prediction - wmv3_dc_scale always used here in fact */

  2222.     if (n < 4)     scale = s->y_dc_scale;

  2223.     else           scale = s->c_dc_scale;

  2224. 

  2225.     wrap = s->block_wrap[n];

  2226.     dc_val= s->dc_val[0] + s->block_index[n];

  2227. 

  2228.     /* B A

  2229.      * C X

  2230.      */

  2231.     c = dc_val[ - 1];

  2232.     b = dc_val[ - 1 - wrap];

  2233.     a = dc_val[ - wrap];

  2234.     /* scale predictors if needed */

  2235.     q1 = s->current_picture.qscale_table[mb_pos];

  2236.     if(c_avail && (n!= 1 && n!=3)) {

  2237.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2238.         if(q2 && q2 != q1)

  2239.             c = (c * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2240.     }

  2241.     if(a_avail && (n!= 2 && n!=3)) {

  2242.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2243.         if(q2 && q2 != q1)

  2244.             a = (a * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2245.     }

  2246.     if(a_avail && c_avail && (n!=3)) {

  2247.         int off = mb_pos;

  2248.         if(n != 1) off--;

  2249.         if(n != 2) off -= s->mb_stride;

  2250.         q2 = s->current_picture.qscale_table[off];

  2251.         if(q2 && q2 != q1)

  2252.             b = (b * s->y_dc_scale_table[q2] * vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2253.     }

  2254. 

  2255.     if(a_avail && c_avail) {

  2256.         if(abs(a - b) <= abs(b - c)) {

  2257.             pred = c;

  2258.             *dir_ptr = 1;//left

  2259.         } else {

  2260.             pred = a;

  2261.             *dir_ptr = 0;//top

  2262.         }

  2263.     } else if(a_avail) {

  2264.         pred = a;

  2265.         *dir_ptr = 0;//top

  2266.     } else if(c_avail) {

  2267.         pred = c;

  2268.         *dir_ptr = 1;//left

  2269.     } else {

  2270.         pred = 0;

  2271.         *dir_ptr = 1;//left

  2272.     }

  2273. 

  2274.     /* update predictor */

  2275.     *dc_val_ptr = &dc_val[0];

  2276.     return pred;

  2277. }

  2278. 

  2279. 

  2280. /**

  2281.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2282.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2283.  * @{

  2284.  */

  2285. 

  2286. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2287. {

  2288.     int xy, wrap, pred, a, b, c;

  2289. 

  2290.     xy = s->block_index[n];

  2291.     wrap = s->b8_stride;

  2292. 

  2293.     /* B C

  2294.      * A X

  2295.      */

  2296.     a = s->coded_block[xy - 1       ];

  2297.     b = s->coded_block[xy - 1 - wrap];

  2298.     c = s->coded_block[xy     - wrap];

  2299. 

  2300.     if (b == c) {

  2301.         pred = a;

  2302.     } else {

  2303.         pred = c;

  2304.     }

  2305. 

  2306.     /* store value */

  2307.     *coded_block_ptr = &s->coded_block[xy];

  2308. 

  2309.     return pred;

  2310. }

  2311. 

  2312. /**

  2313.  * Decode one AC coefficient

  2314.  * @param v The VC1 context

  2315.  * @param last Last coefficient

  2316.  * @param skip How much zero coefficients to skip

  2317.  * @param value Decoded AC coefficient value

  2318.  * @see 8.1.3.4

  2319.  */

  2320. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2321. {

  2322.     GetBitContext *gb = &v->s.gb;

  2323.     int index, escape, run = 0, level = 0, lst = 0;

  2324. 

  2325.     index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2326.     if (index != vc1_ac_sizes[codingset] - 1) {

  2327.         run = vc1_index_decode_table[codingset][index][0];

  2328.         level = vc1_index_decode_table[codingset][index][1];

  2329.         lst = index >= vc1_last_decode_table[codingset];

  2330.         if(get_bits(gb, 1))

  2331.             level = -level;

  2332.     } else {

  2333.         escape = decode210(gb);

  2334.         if (escape != 2) {

  2335.             index = get_vlc2(gb, vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2336.             run = vc1_index_decode_table[codingset][index][0];

  2337.             level = vc1_index_decode_table[codingset][index][1];

  2338.             lst = index >= vc1_last_decode_table[codingset];

  2339.             if(escape == 0) {

  2340.                 if(lst)

  2341.                     level += vc1_last_delta_level_table[codingset][run];

  2342.                 else

  2343.                     level += vc1_delta_level_table[codingset][run];

  2344.             } else {

  2345.                 if(lst)

  2346.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2347.                 else

  2348.                     run += vc1_delta_run_table[codingset][level] + 1;

  2349.             }

  2350.             if(get_bits(gb, 1))

  2351.                 level = -level;

  2352.         } else {

  2353.             int sign;

  2354.             lst = get_bits(gb, 1);

  2355.             if(v->s.esc3_level_length == 0) {

  2356.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2357.                     v->s.esc3_level_length = get_bits(gb, 3);

  2358.                     if(!v->s.esc3_level_length)

  2359.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2360.                 } else { //table 60

  2361.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2362.                 }

  2363.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2364.             }

  2365.             run = get_bits(gb, v->s.esc3_run_length);

  2366.             sign = get_bits(gb, 1);

  2367.             level = get_bits(gb, v->s.esc3_level_length);

  2368.             if(sign)

  2369.                 level = -level;

  2370.         }

  2371.     }

  2372. 

  2373.     *last = lst;

  2374.     *skip = run;

  2375.     *value = level;

  2376. }

  2377. 

  2378. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2379.  * @param v VC1Context

  2380.  * @param block block to decode

  2381.  * @param coded are AC coeffs present or not

  2382.  * @param codingset set of VLC to decode data

  2383.  */

  2384. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2385. {

  2386.     GetBitContext *gb = &v->s.gb;

  2387.     MpegEncContext *s = &v->s;

  2388.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2389.     int run_diff, i;

  2390.     int16_t *dc_val;

  2391.     int16_t *ac_val, *ac_val2;

  2392.     int dcdiff;

  2393. 

  2394.     /* Get DC differential */

  2395.     if (n < 4) {

  2396.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2397.     } else {

  2398.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2399.     }

  2400.     if (dcdiff < 0){

  2401.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2402.         return -1;

  2403.     }

  2404.     if (dcdiff)

  2405.     {

  2406.         if (dcdiff == 119 /* ESC index value */)

  2407.         {

  2408.             /* TODO: Optimize */

  2409.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2410.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2411.             else dcdiff = get_bits(gb, 8);

  2412.         }

  2413.         else

  2414.         {

  2415.             if (v->pq == 1)

  2416.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2417.             else if (v->pq == 2)

  2418.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2419.         }

  2420.         if (get_bits(gb, 1))

  2421.             dcdiff = -dcdiff;

  2422.     }

  2423. 

  2424.     /* Prediction */

  2425.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2426.     *dc_val = dcdiff;

  2427. 

  2428.     /* Store the quantized DC coeff, used for prediction */

  2429.     if (n < 4) {

  2430.         block[0] = dcdiff * s->y_dc_scale;

  2431.     } else {

  2432.         block[0] = dcdiff * s->c_dc_scale;

  2433.     }

  2434.     /* Skip ? */

  2435.     run_diff = 0;

  2436.     i = 0;

  2437.     if (!coded) {

  2438.         goto not_coded;

  2439.     }

  2440. 

  2441.     //AC Decoding

  2442.     i = 1;

  2443. 

  2444.     {

  2445.         int last = 0, skip, value;

  2446.         const int8_t *zz_table;

  2447.         int scale;

  2448.         int k;

  2449. 

  2450.         scale = v->pq * 2 + v->halfpq;

  2451. 

  2452.         if(v->s.ac_pred) {

  2453.             if(!dc_pred_dir)

  2454.                 zz_table = vc1_horizontal_zz;

  2455.             else

  2456.                 zz_table = vc1_vertical_zz;

  2457.         } else

  2458.             zz_table = vc1_normal_zz;

  2459. 

  2460.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2461.         ac_val2 = ac_val;

  2462.         if(dc_pred_dir) //left

  2463.             ac_val -= 16;

  2464.         else //top

  2465.             ac_val -= 16 * s->block_wrap[n];

  2466. 

  2467.         while (!last) {

  2468.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2469.             i += skip;

  2470.             if(i > 63)

  2471.                 break;

  2472.             block[zz_table[i++]] = value;

  2473.         }

  2474. 

  2475.         /* apply AC prediction if needed */

  2476.         if(s->ac_pred) {

  2477.             if(dc_pred_dir) { //left

  2478.                 for(k = 1; k < 8; k++)

  2479.                     block[k << 3] += ac_val[k];

  2480.             } else { //top

  2481.                 for(k = 1; k < 8; k++)

  2482.                     block[k] += ac_val[k + 8];

  2483.             }

  2484.         }

  2485.         /* save AC coeffs for further prediction */

  2486.         for(k = 1; k < 8; k++) {

  2487.             ac_val2[k] = block[k << 3];

  2488.             ac_val2[k + 8] = block[k];

  2489.         }

  2490. 

  2491.         /* scale AC coeffs */

  2492.         for(k = 1; k < 64; k++)

  2493.             if(block[k]) {

  2494.                 block[k] *= scale;

  2495.                 if(!v->pquantizer)

  2496.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2497.             }

  2498. 

  2499.         if(s->ac_pred) i = 63;

  2500.     }

  2501. 

  2502. not_coded:

  2503.     if(!coded) {

  2504.         int k, scale;

  2505.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2506.         ac_val2 = ac_val;

  2507. 

  2508.         scale = v->pq * 2 + v->halfpq;

  2509.         memset(ac_val2, 0, 16 * 2);

  2510.         if(dc_pred_dir) {//left

  2511.             ac_val -= 16;

  2512.             if(s->ac_pred)

  2513.                 memcpy(ac_val2, ac_val, 8 * 2);

  2514.         } else {//top

  2515.             ac_val -= 16 * s->block_wrap[n];

  2516.             if(s->ac_pred)

  2517.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2518.         }

  2519. 

  2520.         /* apply AC prediction if needed */

  2521.         if(s->ac_pred) {

  2522.             if(dc_pred_dir) { //left

  2523.                 for(k = 1; k < 8; k++) {

  2524.                     block[k << 3] = ac_val[k] * scale;

  2525.                     if(!v->pquantizer && block[k << 3])

  2526.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2527.                 }

  2528.             } else { //top

  2529.                 for(k = 1; k < 8; k++) {

  2530.                     block[k] = ac_val[k + 8] * scale;

  2531.                     if(!v->pquantizer && block[k])

  2532.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2533.                 }

  2534.             }

  2535.             i = 63;

  2536.         }

  2537.     }

  2538.     s->block_last_index[n] = i;

  2539. 

  2540.     return 0;

  2541. }

  2542. 

  2543. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2544.  * @param v VC1Context

  2545.  * @param block block to decode

  2546.  * @param coded are AC coeffs present or not

  2547.  * @param codingset set of VLC to decode data

  2548.  */

  2549. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2550. {

  2551.     GetBitContext *gb = &v->s.gb;

  2552.     MpegEncContext *s = &v->s;

  2553.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2554.     int run_diff, i;

  2555.     int16_t *dc_val;

  2556.     int16_t *ac_val, *ac_val2;

  2557.     int dcdiff;

  2558.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2559.     int use_pred = s->ac_pred;

  2560.     int scale;

  2561.     int q1, q2 = 0;

  2562.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2563. 

  2564.     /* Get DC differential */

  2565.     if (n < 4) {

  2566.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2567.     } else {

  2568.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2569.     }

  2570.     if (dcdiff < 0){

  2571.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2572.         return -1;

  2573.     }

  2574.     if (dcdiff)

  2575.     {

  2576.         if (dcdiff == 119 /* ESC index value */)

  2577.         {

  2578.             /* TODO: Optimize */

  2579.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2580.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2581.             else dcdiff = get_bits(gb, 8);

  2582.         }

  2583.         else

  2584.         {

  2585.             if (mquant == 1)

  2586.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2587.             else if (mquant == 2)

  2588.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2589.         }

  2590.         if (get_bits(gb, 1))

  2591.             dcdiff = -dcdiff;

  2592.     }

  2593. 

  2594.     /* Prediction */

  2595.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2596.     *dc_val = dcdiff;

  2597. 

  2598.     /* Store the quantized DC coeff, used for prediction */

  2599.     if (n < 4) {

  2600.         block[0] = dcdiff * s->y_dc_scale;

  2601.     } else {

  2602.         block[0] = dcdiff * s->c_dc_scale;

  2603.     }

  2604.     /* Skip ? */

  2605.     run_diff = 0;

  2606.     i = 0;

  2607. 

  2608.     //AC Decoding

  2609.     i = 1;

  2610. 

  2611.     /* check if AC is needed at all and adjust direction if needed */

  2612.     if(!a_avail) dc_pred_dir = 1;

  2613.     if(!c_avail) dc_pred_dir = 0;

  2614.     if(!a_avail && !c_avail) use_pred = 0;

  2615.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2616.     ac_val2 = ac_val;

  2617. 

  2618.     scale = mquant * 2 + v->halfpq;

  2619. 

  2620.     if(dc_pred_dir) //left

  2621.         ac_val -= 16;

  2622.     else //top

  2623.         ac_val -= 16 * s->block_wrap[n];

  2624. 

  2625.     q1 = s->current_picture.qscale_table[mb_pos];

  2626.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2627.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2628.     if(dc_pred_dir && n==1) q2 = q1;

  2629.     if(!dc_pred_dir && n==2) q2 = q1;

  2630.     if(n==3) q2 = q1;

  2631. 

  2632.     if(coded) {

  2633.         int last = 0, skip, value;

  2634.         const int8_t *zz_table;

  2635.         int k;

  2636. 

  2637.         if(v->s.ac_pred) {

  2638.             if(!dc_pred_dir)

  2639.                 zz_table = vc1_horizontal_zz;

  2640.             else

  2641.                 zz_table = vc1_vertical_zz;

  2642.         } else

  2643.             zz_table = vc1_normal_zz;

  2644. 

  2645.         while (!last) {

  2646.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2647.             i += skip;

  2648.             if(i > 63)

  2649.                 break;

  2650.             block[zz_table[i++]] = value;

  2651.         }

  2652. 

  2653.         /* apply AC prediction if needed */

  2654.         if(use_pred) {

  2655.             /* scale predictors if needed*/

  2656.             if(q2 && q1!=q2) {

  2657.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2658.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2659. 

  2660.                 if(dc_pred_dir) { //left

  2661.                     for(k = 1; k < 8; k++)

  2662.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2663.                 } else { //top

  2664.                     for(k = 1; k < 8; k++)

  2665.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2666.                 }

  2667.             } else {

  2668.                 if(dc_pred_dir) { //left

  2669.                     for(k = 1; k < 8; k++)

  2670.                         block[k << 3] += ac_val[k];

  2671.                 } else { //top

  2672.                     for(k = 1; k < 8; k++)

  2673.                         block[k] += ac_val[k + 8];

  2674.                 }

  2675.             }

  2676.         }

  2677.         /* save AC coeffs for further prediction */

  2678.         for(k = 1; k < 8; k++) {

  2679.             ac_val2[k] = block[k << 3];

  2680.             ac_val2[k + 8] = block[k];

  2681.         }

  2682. 

  2683.         /* scale AC coeffs */

  2684.         for(k = 1; k < 64; k++)

  2685.             if(block[k]) {

  2686.                 block[k] *= scale;

  2687.                 if(!v->pquantizer)

  2688.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2689.             }

  2690. 

  2691.         if(use_pred) i = 63;

  2692.     } else { // no AC coeffs

  2693.         int k;

  2694. 

  2695.         memset(ac_val2, 0, 16 * 2);

  2696.         if(dc_pred_dir) {//left

  2697.             if(use_pred) {

  2698.                 memcpy(ac_val2, ac_val, 8 * 2);

  2699.                 if(q2 && q1!=q2) {

  2700.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2701.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2702.                     for(k = 1; k < 8; k++)

  2703.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2704.                 }

  2705.             }

  2706.         } else {//top

  2707.             if(use_pred) {

  2708.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2709.                 if(q2 && q1!=q2) {

  2710.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2711.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2712.                     for(k = 1; k < 8; k++)

  2713.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2714.                 }

  2715.             }

  2716.         }

  2717. 

  2718.         /* apply AC prediction if needed */

  2719.         if(use_pred) {

  2720.             if(dc_pred_dir) { //left

  2721.                 for(k = 1; k < 8; k++) {

  2722.                     block[k << 3] = ac_val2[k] * scale;

  2723.                     if(!v->pquantizer && block[k << 3])

  2724.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2725.                 }

  2726.             } else { //top

  2727.                 for(k = 1; k < 8; k++) {

  2728.                     block[k] = ac_val2[k + 8] * scale;

  2729.                     if(!v->pquantizer && block[k])

  2730.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2731.                 }

  2732.             }

  2733.             i = 63;

  2734.         }

  2735.     }

  2736.     s->block_last_index[n] = i;

  2737. 

  2738.     return 0;

  2739. }

  2740. 

  2741. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2742.  * @param v VC1Context

  2743.  * @param block block to decode

  2744.  * @param coded are AC coeffs present or not

  2745.  * @param mquant block quantizer

  2746.  * @param codingset set of VLC to decode data

  2747.  */

  2748. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2749. {

  2750.     GetBitContext *gb = &v->s.gb;

  2751.     MpegEncContext *s = &v->s;

  2752.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2753.     int run_diff, i;

  2754.     int16_t *dc_val;

  2755.     int16_t *ac_val, *ac_val2;

  2756.     int dcdiff;

  2757.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2758.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2759.     int use_pred = s->ac_pred;

  2760.     int scale;

  2761.     int q1, q2 = 0;

  2762. 

  2763.     /* XXX: Guard against dumb values of mquant */

  2764.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2765. 

  2766.     /* Set DC scale - y and c use the same */

  2767.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2768.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2769. 

  2770.     /* Get DC differential */

  2771.     if (n < 4) {

  2772.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2773.     } else {

  2774.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2775.     }

  2776.     if (dcdiff < 0){

  2777.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2778.         return -1;

  2779.     }

  2780.     if (dcdiff)

  2781.     {

  2782.         if (dcdiff == 119 /* ESC index value */)

  2783.         {

  2784.             /* TODO: Optimize */

  2785.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2786.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2787.             else dcdiff = get_bits(gb, 8);

  2788.         }

  2789.         else

  2790.         {

  2791.             if (mquant == 1)

  2792.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2793.             else if (mquant == 2)

  2794.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2795.         }

  2796.         if (get_bits(gb, 1))

  2797.             dcdiff = -dcdiff;

  2798.     }

  2799. 

  2800.     /* Prediction */

  2801.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2802.     *dc_val = dcdiff;

  2803. 

  2804.     /* Store the quantized DC coeff, used for prediction */

  2805. 

  2806.     if (n < 4) {

  2807.         block[0] = dcdiff * s->y_dc_scale;

  2808.     } else {

  2809.         block[0] = dcdiff * s->c_dc_scale;

  2810.     }

  2811.     /* Skip ? */

  2812.     run_diff = 0;

  2813.     i = 0;

  2814. 

  2815.     //AC Decoding

  2816.     i = 1;

  2817. 

  2818.     /* check if AC is needed at all and adjust direction if needed */

  2819.     if(!a_avail) dc_pred_dir = 1;

  2820.     if(!c_avail) dc_pred_dir = 0;

  2821.     if(!a_avail && !c_avail) use_pred = 0;

  2822.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2823.     ac_val2 = ac_val;

  2824. 

  2825.     scale = mquant * 2 + v->halfpq;

  2826. 

  2827.     if(dc_pred_dir) //left

  2828.         ac_val -= 16;

  2829.     else //top

  2830.         ac_val -= 16 * s->block_wrap[n];

  2831. 

  2832.     q1 = s->current_picture.qscale_table[mb_pos];

  2833.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2834.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2835.     if(dc_pred_dir && n==1) q2 = q1;

  2836.     if(!dc_pred_dir && n==2) q2 = q1;

  2837.     if(n==3) q2 = q1;

  2838. 

  2839.     if(coded) {

  2840.         int last = 0, skip, value;

  2841.         const int8_t *zz_table;

  2842.         int k;

  2843. 

  2844.         zz_table = vc1_simple_progressive_8x8_zz;

  2845. 

  2846.         while (!last) {

  2847.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2848.             i += skip;

  2849.             if(i > 63)

  2850.                 break;

  2851.             block[zz_table[i++]] = value;

  2852.         }

  2853. 

  2854.         /* apply AC prediction if needed */

  2855.         if(use_pred) {

  2856.             /* scale predictors if needed*/

  2857.             if(q2 && q1!=q2) {

  2858.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2859.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2860. 

  2861.                 if(dc_pred_dir) { //left

  2862.                     for(k = 1; k < 8; k++)

  2863.                         block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2864.                 } else { //top

  2865.                     for(k = 1; k < 8; k++)

  2866.                         block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2867.                 }

  2868.             } else {

  2869.                 if(dc_pred_dir) { //left

  2870.                     for(k = 1; k < 8; k++)

  2871.                         block[k << 3] += ac_val[k];

  2872.                 } else { //top

  2873.                     for(k = 1; k < 8; k++)

  2874.                         block[k] += ac_val[k + 8];

  2875.                 }

  2876.             }

  2877.         }

  2878.         /* save AC coeffs for further prediction */

  2879.         for(k = 1; k < 8; k++) {

  2880.             ac_val2[k] = block[k << 3];

  2881.             ac_val2[k + 8] = block[k];

  2882.         }

  2883. 

  2884.         /* scale AC coeffs */

  2885.         for(k = 1; k < 64; k++)

  2886.             if(block[k]) {

  2887.                 block[k] *= scale;

  2888.                 if(!v->pquantizer)

  2889.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2890.             }

  2891. 

  2892.         if(use_pred) i = 63;

  2893.     } else { // no AC coeffs

  2894.         int k;

  2895. 

  2896.         memset(ac_val2, 0, 16 * 2);

  2897.         if(dc_pred_dir) {//left

  2898.             if(use_pred) {

  2899.                 memcpy(ac_val2, ac_val, 8 * 2);

  2900.                 if(q2 && q1!=q2) {

  2901.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2902.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2903.                     for(k = 1; k < 8; k++)

  2904.                         ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2905.                 }

  2906.             }

  2907.         } else {//top

  2908.             if(use_pred) {

  2909.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2910.                 if(q2 && q1!=q2) {

  2911.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2912.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2913.                     for(k = 1; k < 8; k++)

  2914.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2915.                 }

  2916.             }

  2917.         }

  2918. 

  2919.         /* apply AC prediction if needed */

  2920.         if(use_pred) {

  2921.             if(dc_pred_dir) { //left

  2922.                 for(k = 1; k < 8; k++) {

  2923.                     block[k << 3] = ac_val2[k] * scale;

  2924.                     if(!v->pquantizer && block[k << 3])

  2925.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2926.                 }

  2927.             } else { //top

  2928.                 for(k = 1; k < 8; k++) {

  2929.                     block[k] = ac_val2[k + 8] * scale;

  2930.                     if(!v->pquantizer && block[k])

  2931.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2932.                 }

  2933.             }

  2934.             i = 63;

  2935.         }

  2936.     }

  2937.     s->block_last_index[n] = i;

  2938. 

  2939.     return 0;

  2940. }

  2941. 

  2942. /** Decode P block

  2943.  */

  2944. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2945. {

  2946.     MpegEncContext *s = &v->s;

  2947.     GetBitContext *gb = &s->gb;

  2948.     int i, j;

  2949.     int subblkpat = 0;

  2950.     int scale, off, idx, last, skip, value;

  2951.     int ttblk = ttmb & 7;

  2952. 

  2953.     if(ttmb == -1) {

  2954.         ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2955.     }

  2956.     if(ttblk == TT_4X4) {

  2957.         subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2958.     }

  2959.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2960.         subblkpat = decode012(gb);

  2961.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2962.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2963.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2964.     }

  2965.     scale = 2 * mquant + v->halfpq;

  2966. 

  2967.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2968.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2969.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2970.         ttblk = TT_8X4;

  2971.     }

  2972.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2973.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2974.         ttblk = TT_4X8;

  2975.     }

  2976.     switch(ttblk) {

  2977.     case TT_8X8:

  2978.         i = 0;

  2979.         last = 0;

  2980.         while (!last) {

  2981.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2982.             i += skip;

  2983.             if(i > 63)

  2984.                 break;

  2985.             idx = vc1_simple_progressive_8x8_zz[i++];

  2986.             block[idx] = value * scale;

  2987.             if(!v->pquantizer)

  2988.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2989.         }

  2990.         s->dsp.vc1_inv_trans_8x8(block);

  2991.         break;

  2992.     case TT_4X4:

  2993.         for(j = 0; j < 4; j++) {

  2994.             last = subblkpat & (1 << (3 - j));

  2995.             i = 0;

  2996.             off = (j & 1) * 4 + (j & 2) * 16;

  2997.             while (!last) {

  2998.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2999.                 i += skip;

  3000.                 if(i > 15)

  3001.                     break;

  3002.                 idx = vc1_simple_progressive_4x4_zz[i++];

  3003.                 block[idx + off] = value * scale;

  3004.                 if(!v->pquantizer)

  3005.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3006.             }

  3007.             if(!(subblkpat & (1 << (3 - j))))

  3008.                 s->dsp.vc1_inv_trans_4x4(block, j);

  3009.         }

  3010.         break;

  3011.     case TT_8X4:

  3012.         for(j = 0; j < 2; j++) {

  3013.             last = subblkpat & (1 << (1 - j));

  3014.             i = 0;

  3015.             off = j * 32;

  3016.             while (!last) {

  3017.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3018.                 i += skip;

  3019.                 if(i > 31)

  3020.                     break;

  3021.                 if(v->profile < PROFILE_ADVANCED)

  3022.                     idx = vc1_simple_progressive_8x4_zz[i++];

  3023.                 else

  3024.                     idx = vc1_adv_progressive_8x4_zz[i++];

  3025.                 block[idx + off] = value * scale;

  3026.                 if(!v->pquantizer)

  3027.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3028.             }

  3029.             if(!(subblkpat & (1 << (1 - j))))

  3030.                 s->dsp.vc1_inv_trans_8x4(block, j);

  3031.         }

  3032.         break;

  3033.     case TT_4X8:

  3034.         for(j = 0; j < 2; j++) {

  3035.             last = subblkpat & (1 << (1 - j));

  3036.             i = 0;

  3037.             off = j * 4;

  3038.             while (!last) {

  3039.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3040.                 i += skip;

  3041.                 if(i > 31)

  3042.                     break;

  3043.                 if(v->profile < PROFILE_ADVANCED)

  3044.                     idx = vc1_simple_progressive_4x8_zz[i++];

  3045.                 else

  3046.                     idx = vc1_adv_progressive_4x8_zz[i++];

  3047.                 block[idx + off] = value * scale;

  3048.                 if(!v->pquantizer)

  3049.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3050.             }

  3051.             if(!(subblkpat & (1 << (1 - j))))

  3052.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3053.         }

  3054.         break;

  3055.     }

  3056.     return 0;

  3057. }

  3058. 

  3059. 

  3060. /** Decode one P-frame MB (in Simple/Main profile)

  3061.  */

  3062. static int vc1_decode_p_mb(VC1Context *v)

  3063. {

  3064.     MpegEncContext *s = &v->s;

  3065.     GetBitContext *gb = &s->gb;

  3066.     int i, j;

  3067.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3068.     int cbp; /* cbp decoding stuff */

  3069.     int mqdiff, mquant; /* MB quantization */

  3070.     int ttmb = v->ttfrm; /* MB Transform type */

  3071.     int status;

  3072. 

  3073.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3074.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3075.     int mb_has_coeffs = 1; /* last_flag */

  3076.     int dmv_x, dmv_y; /* Differential MV components */

  3077.     int index, index1; /* LUT indices */

  3078.     int val, sign; /* temp values */

  3079.     int first_block = 1;

  3080.     int dst_idx, off;

  3081.     int skipped, fourmv;

  3082. 

  3083.     mquant = v->pq; /* Loosy initialization */

  3084. 

  3085.     if (v->mv_type_is_raw)

  3086.         fourmv = get_bits1(gb);

  3087.     else

  3088.         fourmv = v->mv_type_mb_plane[mb_pos];

  3089.     if (v->skip_is_raw)

  3090.         skipped = get_bits1(gb);

  3091.     else

  3092.         skipped = v->s.mbskip_table[mb_pos];

  3093. 

  3094.     s->dsp.clear_blocks(s->block[0]);

  3095. 

  3096.     if (!fourmv) /* 1MV mode */

  3097.     {

  3098.         if (!skipped)

  3099.         {

  3100.             GET_MVDATA(dmv_x, dmv_y);

  3101. 

  3102.             if (s->mb_intra) {

  3103.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3104.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3105.             }

  3106.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3107.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3108. 

  3109.             /* FIXME Set DC val for inter block ? */

  3110.             if (s->mb_intra && !mb_has_coeffs)

  3111.             {

  3112.                 GET_MQUANT();

  3113.                 s->ac_pred = get_bits(gb, 1);

  3114.                 cbp = 0;

  3115.             }

  3116.             else if (mb_has_coeffs)

  3117.             {

  3118.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  3119.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3120.                 GET_MQUANT();

  3121.             }

  3122.             else

  3123.             {

  3124.                 mquant = v->pq;

  3125.                 cbp = 0;

  3126.             }

  3127.             s->current_picture.qscale_table[mb_pos] = mquant;

  3128. 

  3129.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3130.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,

  3131.                                 VC1_TTMB_VLC_BITS, 2);

  3132.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3133.             dst_idx = 0;

  3134.             for (i=0; i<6; i++)

  3135.             {

  3136.                 s->dc_val[0][s->block_index[i]] = 0;

  3137.                 dst_idx += i >> 2;

  3138.                 val = ((cbp >> (5 - i)) & 1);

  3139.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3140.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3141.                 if(s->mb_intra) {

  3142.                     /* check if prediction blocks A and C are available */

  3143.                     v->a_avail = v->c_avail = 0;

  3144.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3145.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3146.                     if(i == 1 || i == 3 || s->mb_x)

  3147.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3148. 

  3149.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3150.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3151.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3152.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3153.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3154.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3155.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3156.                     if(v->pq >= 9 && v->overlap) {

  3157.                         if(v->c_avail)

  3158.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3159.                         if(v->a_avail)

  3160.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3161.                     }

  3162.                 } else if(val) {

  3163.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3164.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3165.                     first_block = 0;

  3166.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3167.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3168.                 }

  3169.             }

  3170.         }

  3171.         else //Skipped

  3172.         {

  3173.             s->mb_intra = 0;

  3174.             for(i = 0; i < 6; i++) {

  3175.                 v->mb_type[0][s->block_index[i]] = 0;

  3176.                 s->dc_val[0][s->block_index[i]] = 0;

  3177.             }

  3178.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3179.             s->current_picture.qscale_table[mb_pos] = 0;

  3180.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3181.             vc1_mc_1mv(v, 0);

  3182.             return 0;

  3183.         }

  3184.     } //1MV mode

  3185.     else //4MV mode

  3186.     {

  3187.         if (!skipped /* unskipped MB */)

  3188.         {

  3189.             int intra_count = 0, coded_inter = 0;

  3190.             int is_intra[6], is_coded[6];

  3191.             /* Get CBPCY */

  3192.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3193.             for (i=0; i<6; i++)

  3194.             {

  3195.                 val = ((cbp >> (5 - i)) & 1);

  3196.                 s->dc_val[0][s->block_index[i]] = 0;

  3197.                 s->mb_intra = 0;

  3198.                 if(i < 4) {

  3199.                     dmv_x = dmv_y = 0;

  3200.                     s->mb_intra = 0;

  3201.                     mb_has_coeffs = 0;

  3202.                     if(val) {

  3203.                         GET_MVDATA(dmv_x, dmv_y);

  3204.                     }

  3205.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3206.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3207.                     intra_count += s->mb_intra;

  3208.                     is_intra[i] = s->mb_intra;

  3209.                     is_coded[i] = mb_has_coeffs;

  3210.                 }

  3211.                 if(i&4){

  3212.                     is_intra[i] = (intra_count >= 3);

  3213.                     is_coded[i] = val;

  3214.                 }

  3215.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3216.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3217.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3218.             }

  3219.             // if there are no coded blocks then don't do anything more

  3220.             if(!intra_count && !coded_inter) return 0;

  3221.             dst_idx = 0;

  3222.             GET_MQUANT();

  3223.             s->current_picture.qscale_table[mb_pos] = mquant;

  3224.             /* test if block is intra and has pred */

  3225.             {

  3226.                 int intrapred = 0;

  3227.                 for(i=0; i<6; i++)

  3228.                     if(is_intra[i]) {

  3229.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3230.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3231.                             intrapred = 1;

  3232.                             break;

  3233.                         }

  3234.                     }

  3235.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  3236.                 else s->ac_pred = 0;

  3237.             }

  3238.             if (!v->ttmbf && coded_inter)

  3239.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3240.             for (i=0; i<6; i++)

  3241.             {

  3242.                 dst_idx += i >> 2;

  3243.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3244.                 s->mb_intra = is_intra[i];

  3245.                 if (is_intra[i]) {

  3246.                     /* check if prediction blocks A and C are available */

  3247.                     v->a_avail = v->c_avail = 0;

  3248.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3249.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3250.                     if(i == 1 || i == 3 || s->mb_x)

  3251.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3252. 

  3253.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3254.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3255.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3256.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3257.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3258.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3259.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3260.                     if(v->pq >= 9 && v->overlap) {

  3261.                         if(v->c_avail)

  3262.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3263.                         if(v->a_avail)

  3264.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3265.                     }

  3266.                 } else if(is_coded[i]) {

  3267.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3268.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3269.                     first_block = 0;

  3270.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3271.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3272.                 }

  3273.             }

  3274.             return status;

  3275.         }

  3276.         else //Skipped MB

  3277.         {

  3278.             s->mb_intra = 0;

  3279.             s->current_picture.qscale_table[mb_pos] = 0;

  3280.             for (i=0; i<6; i++) {

  3281.                 v->mb_type[0][s->block_index[i]] = 0;

  3282.                 s->dc_val[0][s->block_index[i]] = 0;

  3283.             }

  3284.             for (i=0; i<4; i++)

  3285.             {

  3286.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3287.                 vc1_mc_4mv_luma(v, i);

  3288.             }

  3289.             vc1_mc_4mv_chroma(v);

  3290.             s->current_picture.qscale_table[mb_pos] = 0;

  3291.             return 0;

  3292.         }

  3293.     }

  3294. 

  3295.     /* Should never happen */

  3296.     return -1;

  3297. }

  3298. 

  3299. /** Decode one B-frame MB (in Main profile)

  3300.  */

  3301. static void vc1_decode_b_mb(VC1Context *v)

  3302. {

  3303.     MpegEncContext *s = &v->s;

  3304.     GetBitContext *gb = &s->gb;

  3305.     int i, j;

  3306.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3307.     int cbp = 0; /* cbp decoding stuff */

  3308.     int mqdiff, mquant; /* MB quantization */

  3309.     int ttmb = v->ttfrm; /* MB Transform type */

  3310. 

  3311.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3312.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3313.     int mb_has_coeffs = 0; /* last_flag */

  3314.     int index, index1; /* LUT indices */

  3315.     int val, sign; /* temp values */

  3316.     int first_block = 1;

  3317.     int dst_idx, off;

  3318.     int skipped, direct;

  3319.     int dmv_x[2], dmv_y[2];

  3320.     int bmvtype = BMV_TYPE_BACKWARD;

  3321. 

  3322.     mquant = v->pq; /* Loosy initialization */

  3323.     s->mb_intra = 0;

  3324. 

  3325.     if (v->dmb_is_raw)

  3326.         direct = get_bits1(gb);

  3327.     else

  3328.         direct = v->direct_mb_plane[mb_pos];

  3329.     if (v->skip_is_raw)

  3330.         skipped = get_bits1(gb);

  3331.     else

  3332.         skipped = v->s.mbskip_table[mb_pos];

  3333. 

  3334.     s->dsp.clear_blocks(s->block[0]);

  3335.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3336.     for(i = 0; i < 6; i++) {

  3337.         v->mb_type[0][s->block_index[i]] = 0;

  3338.         s->dc_val[0][s->block_index[i]] = 0;

  3339.     }

  3340.     s->current_picture.qscale_table[mb_pos] = 0;

  3341. 

  3342.     if (!direct) {

  3343.         if (!skipped) {

  3344.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3345.             dmv_x[1] = dmv_x[0];

  3346.             dmv_y[1] = dmv_y[0];

  3347.         }

  3348.         if(skipped || !s->mb_intra) {

  3349.             bmvtype = decode012(gb);

  3350.             switch(bmvtype) {

  3351.             case 0:

  3352.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3353.                 break;

  3354.             case 1:

  3355.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3356.                 break;

  3357.             case 2:

  3358.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3359.                 dmv_x[0] = dmv_y[0] = 0;

  3360.             }

  3361.         }

  3362.     }

  3363.     for(i = 0; i < 6; i++)

  3364.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3365. 

  3366.     if (skipped) {

  3367.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3368.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3369.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3370.         return;

  3371.     }

  3372.     if (direct) {

  3373.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3374.         GET_MQUANT();

  3375.         s->mb_intra = 0;

  3376.         mb_has_coeffs = 0;

  3377.         s->current_picture.qscale_table[mb_pos] = mquant;

  3378.         if(!v->ttmbf)

  3379.             ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3380.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3381.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3382.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3383.     } else {

  3384.         if(!mb_has_coeffs && !s->mb_intra) {

  3385.             /* no coded blocks - effectively skipped */

  3386.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3387.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3388.             return;

  3389.         }

  3390.         if(s->mb_intra && !mb_has_coeffs) {

  3391.             GET_MQUANT();

  3392.             s->current_picture.qscale_table[mb_pos] = mquant;

  3393.             s->ac_pred = get_bits1(gb);

  3394.             cbp = 0;

  3395.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3396.         } else {

  3397.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3398.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3399.                 if(!mb_has_coeffs) {

  3400.                     /* interpolated skipped block */

  3401.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3402.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3403.                     return;

  3404.                 }

  3405.             }

  3406.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3407.             if(!s->mb_intra) {

  3408.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3409.             }

  3410.             if(s->mb_intra)

  3411.                 s->ac_pred = get_bits1(gb);

  3412.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3413.             GET_MQUANT();

  3414.             s->current_picture.qscale_table[mb_pos] = mquant;

  3415.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3416.                 ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3417.         }

  3418.     }

  3419.     dst_idx = 0;

  3420.     for (i=0; i<6; i++)

  3421.     {

  3422.         s->dc_val[0][s->block_index[i]] = 0;

  3423.         dst_idx += i >> 2;

  3424.         val = ((cbp >> (5 - i)) & 1);

  3425.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3426.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3427.         if(s->mb_intra) {

  3428.             /* check if prediction blocks A and C are available */

  3429.             v->a_avail = v->c_avail = 0;

  3430.             if(i == 2 || i == 3 || !s->first_slice_line)

  3431.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3432.             if(i == 1 || i == 3 || s->mb_x)

  3433.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3434. 

  3435.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3436.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3437.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3438.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3439.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3440.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3441.         } else if(val) {

  3442.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3443.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3444.             first_block = 0;

  3445.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3446.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3447.         }

  3448.     }

  3449. }

  3450. 

  3451. /** Decode blocks of I-frame

  3452.  */

  3453. static void vc1_decode_i_blocks(VC1Context *v)

  3454. {

  3455.     int k, j;

  3456.     MpegEncContext *s = &v->s;

  3457.     int cbp, val;

  3458.     uint8_t *coded_val;

  3459.     int mb_pos;

  3460. 

  3461.     /* select codingmode used for VLC tables selection */

  3462.     switch(v->y_ac_table_index){

  3463.     case 0:

  3464.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3465.         break;

  3466.     case 1:

  3467.         v->codingset = CS_HIGH_MOT_INTRA;

  3468.         break;

  3469.     case 2:

  3470.         v->codingset = CS_MID_RATE_INTRA;

  3471.         break;

  3472.     }

  3473. 

  3474.     switch(v->c_ac_table_index){

  3475.     case 0:

  3476.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3477.         break;

  3478.     case 1:

  3479.         v->codingset2 = CS_HIGH_MOT_INTER;

  3480.         break;

  3481.     case 2:

  3482.         v->codingset2 = CS_MID_RATE_INTER;

  3483.         break;

  3484.     }

  3485. 

  3486.     /* Set DC scale - y and c use the same */

  3487.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3488.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3489. 

  3490.     //do frame decode

  3491.     s->mb_x = s->mb_y = 0;

  3492.     s->mb_intra = 1;

  3493.     s->first_slice_line = 1;

  3494.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3495.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3496.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3497.             ff_init_block_index(s);

  3498.             ff_update_block_index(s);

  3499.             s->dsp.clear_blocks(s->block[0]);

  3500.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3501.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3502.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3503.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3504.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3505. 

  3506.             // do actual MB decoding and displaying

  3507.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3508.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  3509. 

  3510.             for(k = 0; k < 6; k++) {

  3511.                 val = ((cbp >> (5 - k)) & 1);

  3512. 

  3513.                 if (k < 4) {

  3514.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3515.                     val = val ^ pred;

  3516.                     *coded_val = val;

  3517.                 }

  3518.                 cbp |= val << (5 - k);

  3519. 

  3520.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3521. 

  3522.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3523.                 if(!v->res_fasttx && !v->res_x8) for(j = 0; j < 64; j++) s->block[k][j] -= 16;

  3524.                 if(v->pq >= 9 && v->overlap) {

  3525.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3526.                 }

  3527.             }

  3528. 

  3529.             vc1_put_block(v, s->block);

  3530.             if(v->pq >= 9 && v->overlap) {

  3531.                 if(s->mb_x) {

  3532.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3533.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3534.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3535.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3536.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3537.                     }

  3538.                 }

  3539.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3540.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3541.                 if(!s->first_slice_line) {

  3542.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3543.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3544.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3545.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3546.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3547.                     }

  3548.                 }

  3549.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3550.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3551.             }

  3552. 

  3553.             if(get_bits_count(&s->gb) > v->bits) {

  3554.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3555.                 return;

  3556.             }

  3557.         }

  3558.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3559.         s->first_slice_line = 0;

  3560.     }

  3561. }

  3562. 

  3563. /** Decode blocks of I-frame for advanced profile

  3564.  */

  3565. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3566. {

  3567.     int k, j;

  3568.     MpegEncContext *s = &v->s;

  3569.     int cbp, val;

  3570.     uint8_t *coded_val;

  3571.     int mb_pos;

  3572.     int mquant = v->pq;

  3573.     int mqdiff;

  3574.     int overlap;

  3575.     GetBitContext *gb = &s->gb;

  3576. 

  3577.     /* select codingmode used for VLC tables selection */

  3578.     switch(v->y_ac_table_index){

  3579.     case 0:

  3580.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3581.         break;

  3582.     case 1:

  3583.         v->codingset = CS_HIGH_MOT_INTRA;

  3584.         break;

  3585.     case 2:

  3586.         v->codingset = CS_MID_RATE_INTRA;

  3587.         break;

  3588.     }

  3589. 

  3590.     switch(v->c_ac_table_index){

  3591.     case 0:

  3592.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3593.         break;

  3594.     case 1:

  3595.         v->codingset2 = CS_HIGH_MOT_INTER;

  3596.         break;

  3597.     case 2:

  3598.         v->codingset2 = CS_MID_RATE_INTER;

  3599.         break;

  3600.     }

  3601. 

  3602.     //do frame decode

  3603.     s->mb_x = s->mb_y = 0;

  3604.     s->mb_intra = 1;

  3605.     s->first_slice_line = 1;

  3606.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3607.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3608.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3609.             ff_init_block_index(s);

  3610.             ff_update_block_index(s);

  3611.             s->dsp.clear_blocks(s->block[0]);

  3612.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3613.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3614.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3615.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3616. 

  3617.             // do actual MB decoding and displaying

  3618.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3619.             if(v->acpred_is_raw)

  3620.                 v->s.ac_pred = get_bits(&v->s.gb, 1);

  3621.             else

  3622.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3623. 

  3624.             if(v->condover == CONDOVER_SELECT) {

  3625.                 if(v->overflg_is_raw)

  3626.                     overlap = get_bits(&v->s.gb, 1);

  3627.                 else

  3628.                     overlap = v->over_flags_plane[mb_pos];

  3629.             } else

  3630.                 overlap = (v->condover == CONDOVER_ALL);

  3631. 

  3632.             GET_MQUANT();

  3633. 

  3634.             s->current_picture.qscale_table[mb_pos] = mquant;

  3635.             /* Set DC scale - y and c use the same */

  3636.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3637.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3638. 

  3639.             for(k = 0; k < 6; k++) {

  3640.                 val = ((cbp >> (5 - k)) & 1);

  3641. 

  3642.                 if (k < 4) {

  3643.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3644.                     val = val ^ pred;

  3645.                     *coded_val = val;

  3646.                 }

  3647.                 cbp |= val << (5 - k);

  3648. 

  3649.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3650.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3651. 

  3652.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3653. 

  3654.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3655.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3656.             }

  3657. 

  3658.             vc1_put_block(v, s->block);

  3659.             if(overlap) {

  3660.                 if(s->mb_x) {

  3661.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3662.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3663.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3664.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3665.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3666.                     }

  3667.                 }

  3668.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3669.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3670.                 if(!s->first_slice_line) {

  3671.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3672.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3673.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3674.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3675.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3676.                     }

  3677.                 }

  3678.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3679.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3680.             }

  3681. 

  3682.             if(get_bits_count(&s->gb) > v->bits) {

  3683.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3684.                 return;

  3685.             }

  3686.         }

  3687.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3688.         s->first_slice_line = 0;

  3689.     }

  3690. }

  3691. 

  3692. static void vc1_decode_p_blocks(VC1Context *v)

  3693. {

  3694.     MpegEncContext *s = &v->s;

  3695. 

  3696.     /* select codingmode used for VLC tables selection */

  3697.     switch(v->c_ac_table_index){

  3698.     case 0:

  3699.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3700.         break;

  3701.     case 1:

  3702.         v->codingset = CS_HIGH_MOT_INTRA;

  3703.         break;

  3704.     case 2:

  3705.         v->codingset = CS_MID_RATE_INTRA;

  3706.         break;

  3707.     }

  3708. 

  3709.     switch(v->c_ac_table_index){

  3710.     case 0:

  3711.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3712.         break;

  3713.     case 1:

  3714.         v->codingset2 = CS_HIGH_MOT_INTER;

  3715.         break;

  3716.     case 2:

  3717.         v->codingset2 = CS_MID_RATE_INTER;

  3718.         break;

  3719.     }

  3720. 

  3721.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3722.     s->first_slice_line = 1;

  3723.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3724.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3725.             ff_init_block_index(s);

  3726.             ff_update_block_index(s);

  3727.             s->dsp.clear_blocks(s->block[0]);

  3728. 

  3729.             vc1_decode_p_mb(v);

  3730.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3731.                 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);

  3732.                 return;

  3733.             }

  3734.         }

  3735.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3736.         s->first_slice_line = 0;

  3737.     }

  3738. }

  3739. 

  3740. static void vc1_decode_b_blocks(VC1Context *v)

  3741. {

  3742.     MpegEncContext *s = &v->s;

  3743. 

  3744.     /* select codingmode used for VLC tables selection */

  3745.     switch(v->c_ac_table_index){

  3746.     case 0:

  3747.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3748.         break;

  3749.     case 1:

  3750.         v->codingset = CS_HIGH_MOT_INTRA;

  3751.         break;

  3752.     case 2:

  3753.         v->codingset = CS_MID_RATE_INTRA;

  3754.         break;

  3755.     }

  3756. 

  3757.     switch(v->c_ac_table_index){

  3758.     case 0:

  3759.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3760.         break;

  3761.     case 1:

  3762.         v->codingset2 = CS_HIGH_MOT_INTER;

  3763.         break;

  3764.     case 2:

  3765.         v->codingset2 = CS_MID_RATE_INTER;

  3766.         break;

  3767.     }

  3768. 

  3769.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3770.     s->first_slice_line = 1;

  3771.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3772.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3773.             ff_init_block_index(s);

  3774.             ff_update_block_index(s);

  3775.             s->dsp.clear_blocks(s->block[0]);

  3776. 

  3777.             vc1_decode_b_mb(v);

  3778.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3779.                 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);

  3780.                 return;

  3781.             }

  3782.         }

  3783.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3784.         s->first_slice_line = 0;

  3785.     }

  3786. }

  3787. 

  3788. static void vc1_decode_skip_blocks(VC1Context *v)

  3789. {

  3790.     MpegEncContext *s = &v->s;

  3791. 

  3792.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3793.     s->first_slice_line = 1;

  3794.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3795.         s->mb_x = 0;

  3796.         ff_init_block_index(s);

  3797.         ff_update_block_index(s);

  3798.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  3799.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3800.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3801.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3802.         s->first_slice_line = 0;

  3803.     }

  3804.     s->pict_type = P_TYPE;

  3805. }

  3806. 

  3807. static void vc1_decode_blocks(VC1Context *v)

  3808. {

  3809. 

  3810.     v->s.esc3_level_length = 0;

  3811. 

  3812.     switch(v->s.pict_type) {

  3813.     case I_TYPE:

  3814.         if(v->profile == PROFILE_ADVANCED)

  3815.             vc1_decode_i_blocks_adv(v);

  3816.         else

  3817.             vc1_decode_i_blocks(v);

  3818.         break;

  3819.     case P_TYPE:

  3820.         if(v->p_frame_skipped)

  3821.             vc1_decode_skip_blocks(v);

  3822.         else

  3823.             vc1_decode_p_blocks(v);

  3824.         break;

  3825.     case B_TYPE:

  3826.         if(v->bi_type){

  3827.             if(v->profile == PROFILE_ADVANCED)

  3828.                 vc1_decode_i_blocks_adv(v);

  3829.             else

  3830.                 vc1_decode_i_blocks(v);

  3831.         }else

  3832.             vc1_decode_b_blocks(v);

  3833.         break;

  3834.     }

  3835. }

  3836. 

  3837. /** Find VC-1 marker in buffer

  3838.  * @return position where next marker starts or end of buffer if no marker found

  3839.  */

  3840. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  3841. {

  3842.     uint32_t mrk = 0xFFFFFFFF;

  3843. 

  3844.     if(end-src < 4) return end;

  3845.     while(src < end){

  3846.         mrk = (mrk << 8) | *src++;

  3847.         if(IS_MARKER(mrk))

  3848.             return src-4;

  3849.     }

  3850.     return end;

  3851. }

  3852. 

  3853. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  3854. {

  3855.     int dsize = 0, i;

  3856. 

  3857.     if(size < 4){

  3858.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  3859.         return size;

  3860.     }

  3861.     for(i = 0; i < size; i++, src++) {

  3862.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  3863.             dst[dsize++] = src[1];

  3864.             src++;

  3865.             i++;

  3866.         } else

  3867.             dst[dsize++] = *src;

  3868.     }

  3869.     return dsize;

  3870. }

  3871. 

  3872. /** Initialize a VC1/WMV3 decoder

  3873.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3874.  * @todo TODO: Decypher remaining bits in extra_data

  3875.  */

  3876. static int vc1_decode_init(AVCodecContext *avctx)

  3877. {

  3878.     VC1Context *v = avctx->priv_data;

  3879.     MpegEncContext *s = &v->s;

  3880.     GetBitContext gb;

  3881. 

  3882.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3883.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3884.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3885.     else

  3886.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3887.     v->s.avctx = avctx;

  3888.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3889.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3890. 

  3891.     if(ff_h263_decode_init(avctx) < 0)

  3892.         return -1;

  3893.     if (vc1_init_common(v) < 0) return -1;

  3894. 

  3895.     avctx->coded_width = avctx->width;

  3896.     avctx->coded_height = avctx->height;

  3897.     if (avctx->codec_id == CODEC_ID_WMV3)

  3898.     {

  3899.         int count = 0;

  3900. 

  3901.         // looks like WMV3 has a sequence header stored in the extradata

  3902.         // advanced sequence header may be before the first frame

  3903.         // the last byte of the extradata is a version number, 1 for the

  3904.         // samples we can decode

  3905. 

  3906.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3907. 

  3908.         if (decode_sequence_header(avctx, &gb) < 0)

  3909.           return -1;

  3910. 

  3911.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3912.         if (count>0)

  3913.         {

  3914.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3915.                    count, get_bits(&gb, count));

  3916.         }

  3917.         else if (count < 0)

  3918.         {

  3919.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3920.         }

  3921.     } else { // VC1/WVC1

  3922.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  3923.         uint8_t *next; int size, buf2_size;

  3924.         uint8_t *buf2 = NULL;

  3925.         int seq_inited = 0, ep_inited = 0;

  3926. 

  3927.         if(avctx->extradata_size < 16) {

  3928.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  3929.             return -1;

  3930.         }

  3931. 

  3932.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3933.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  3934.         next = start;

  3935.         for(; next < end; start = next){

  3936.             next = find_next_marker(start + 4, end);

  3937.             size = next - start - 4;

  3938.             if(size <= 0) continue;

  3939.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  3940.             init_get_bits(&gb, buf2, buf2_size * 8);

  3941.             switch(AV_RB32(start)){

  3942.             case VC1_CODE_SEQHDR:

  3943.                 if(decode_sequence_header(avctx, &gb) < 0){

  3944.                     av_free(buf2);

  3945.                     return -1;

  3946.                 }

  3947.                 seq_inited = 1;

  3948.                 break;

  3949.             case VC1_CODE_ENTRYPOINT:

  3950.                 if(decode_entry_point(avctx, &gb) < 0){

  3951.                     av_free(buf2);

  3952.                     return -1;

  3953.                 }

  3954.                 ep_inited = 1;

  3955.                 break;

  3956.             }

  3957.         }

  3958.         av_free(buf2);

  3959.         if(!seq_inited || !ep_inited){

  3960.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  3961.             return -1;

  3962.         }

  3963.     }

  3964.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3965.     s->low_delay = !avctx->has_b_frames;

  3966. 

  3967.     s->mb_width = (avctx->coded_width+15)>>4;

  3968.     s->mb_height = (avctx->coded_height+15)>>4;

  3969. 

  3970.     /* Allocate mb bitplanes */

  3971.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3972.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3973.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  3974.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  3975. 

  3976.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3977.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3978.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3979.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3980.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3981. 

  3982.     /* Init coded blocks info */

  3983.     if (v->profile == PROFILE_ADVANCED)

  3984.     {

  3985. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3986. //            return -1;

  3987. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3988. //            return -1;

  3989.     }

  3990. 

  3991.     return 0;

  3992. }

  3993. 

  3994. 

  3995. /** Decode a VC1/WMV3 frame

  3996.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3997.  */

  3998. static int vc1_decode_frame(AVCodecContext *avctx,

  3999.                             void *data, int *data_size,

  4000.                             uint8_t *buf, int buf_size)

  4001. {

  4002.     VC1Context *v = avctx->priv_data;

  4003.     MpegEncContext *s = &v->s;

  4004.     AVFrame *pict = data;

  4005.     uint8_t *buf2 = NULL;

  4006. 

  4007.     /* no supplementary picture */

  4008.     if (buf_size == 0) {

  4009.         /* special case for last picture */

  4010.         if (s->low_delay==0 && s->next_picture_ptr) {

  4011.             *pict= *(AVFrame*)s->next_picture_ptr;

  4012.             s->next_picture_ptr= NULL;

  4013. 

  4014.             *data_size = sizeof(AVFrame);

  4015.         }

  4016. 

  4017.         return 0;

  4018.     }

  4019. 

  4020.     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there

  4021.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  4022.         int i= ff_find_unused_picture(s, 0);

  4023.         s->current_picture_ptr= &s->picture[i];

  4024.     }

  4025. 

  4026.     //for advanced profile we may need to parse and unescape data

  4027.     if (avctx->codec_id == CODEC_ID_VC1) {

  4028.         int buf_size2 = 0;

  4029.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4030. 

  4031.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  4032.             uint8_t *start, *end, *next;

  4033.             int size;

  4034. 

  4035.             next = buf;

  4036.             for(start = buf, end = buf + buf_size; next < end; start = next){

  4037.                 next = find_next_marker(start + 4, end);

  4038.                 size = next - start - 4;

  4039.                 if(size <= 0) continue;

  4040.                 switch(AV_RB32(start)){

  4041.                 case VC1_CODE_FRAME:

  4042.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4043.                     break;

  4044.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4045.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4046.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4047.                     decode_entry_point(avctx, &s->gb);

  4048.                     break;

  4049.                 case VC1_CODE_SLICE:

  4050.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4051.                     av_free(buf2);

  4052.                     return -1;

  4053.                 }

  4054.             }

  4055.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4056.             uint8_t *divider;

  4057. 

  4058.             divider = find_next_marker(buf, buf + buf_size);

  4059.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4060.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4061.                 return -1;

  4062.             }

  4063. 

  4064.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4065.             // TODO

  4066.             av_free(buf2);return -1;

  4067.         }else{

  4068.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4069.         }

  4070.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4071.     } else

  4072.         init_get_bits(&s->gb, buf, buf_size*8);

  4073.     // do parse frame header

  4074.     if(v->profile < PROFILE_ADVANCED) {

  4075.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4076.             av_free(buf2);

  4077.             return -1;

  4078.         }

  4079.     } else {

  4080.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4081.             av_free(buf2);

  4082.             return -1;

  4083.         }

  4084.     }

  4085. 

  4086.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4087.         av_free(buf2);

  4088.         return -1;

  4089.     }

  4090. 

  4091.     // for hurry_up==5

  4092.     s->current_picture.pict_type= s->pict_type;

  4093.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4094. 

  4095.     /* skip B-frames if we don't have reference frames */

  4096.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4097.         av_free(buf2);

  4098.         return -1;//buf_size;

  4099.     }

  4100.     /* skip b frames if we are in a hurry */

  4101.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4102.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4103.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4104.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4105.         av_free(buf2);

  4106.         return buf_size;

  4107.     }

  4108.     /* skip everything if we are in a hurry>=5 */

  4109.     if(avctx->hurry_up>=5) {

  4110.         av_free(buf2);

  4111.         return -1;//buf_size;

  4112.     }

  4113. 

  4114.     if(s->next_p_frame_damaged){

  4115.         if(s->pict_type==B_TYPE)

  4116.             return buf_size;

  4117.         else

  4118.             s->next_p_frame_damaged=0;

  4119.     }

  4120. 

  4121.     if(MPV_frame_start(s, avctx) < 0) {

  4122.         av_free(buf2);

  4123.         return -1;

  4124.     }

  4125. 

  4126.     ff_er_frame_start(s);

  4127. 

  4128.     v->bits = buf_size * 8;

  4129.     vc1_decode_blocks(v);

  4130. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4131. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4132. //      return -1;

  4133.     ff_er_frame_end(s);

  4134. 

  4135.     MPV_frame_end(s);

  4136. 

  4137. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4138. assert(s->current_picture.pict_type == s->pict_type);

  4139.     if (s->pict_type == B_TYPE || s->low_delay) {

  4140.         *pict= *(AVFrame*)s->current_picture_ptr;

  4141.     } else if (s->last_picture_ptr != NULL) {

  4142.         *pict= *(AVFrame*)s->last_picture_ptr;

  4143.     }

  4144. 

  4145.     if(s->last_picture_ptr || s->low_delay){

  4146.         *data_size = sizeof(AVFrame);

  4147.         ff_print_debug_info(s, pict);

  4148.     }

  4149. 

  4150.     /* Return the Picture timestamp as the frame number */

  4151.     /* we substract 1 because it is added on utils.c    */

  4152.     avctx->frame_number = s->picture_number - 1;

  4153. 

  4154.     av_free(buf2);

  4155.     return buf_size;

  4156. }

  4157. 

  4158. 

  4159. /** Close a VC1/WMV3 decoder

  4160.  * @warning Initial try at using MpegEncContext stuff

  4161.  */

  4162. static int vc1_decode_end(AVCodecContext *avctx)

  4163. {

  4164.     VC1Context *v = avctx->priv_data;

  4165. 

  4166.     av_freep(&v->hrd_rate);

  4167.     av_freep(&v->hrd_buffer);

  4168.     MPV_common_end(&v->s);

  4169.     av_freep(&v->mv_type_mb_plane);

  4170.     av_freep(&v->direct_mb_plane);

  4171.     av_freep(&v->acpred_plane);

  4172.     av_freep(&v->over_flags_plane);

  4173.     av_freep(&v->mb_type_base);

  4174.     return 0;

  4175. }

  4176. 

  4177. 

  4178. AVCodec vc1_decoder = {

  4179.     "vc1",

  4180.     CODEC_TYPE_VIDEO,

  4181.     CODEC_ID_VC1,

  4182.     sizeof(VC1Context),

  4183.     vc1_decode_init,

  4184.     NULL,

  4185.     vc1_decode_end,

  4186.     vc1_decode_frame,

  4187.     CODEC_CAP_DELAY,

  4188.     NULL

  4189. };

  4190. 

  4191. AVCodec wmv3_decoder = {

  4192.     "wmv3",

  4193.     CODEC_TYPE_VIDEO,

  4194.     CODEC_ID_WMV3,

  4195.     sizeof(VC1Context),

  4196.     vc1_decode_init,

  4197.     NULL,

  4198.     vc1_decode_end,

  4199.     vc1_decode_frame,

  4200.     CODEC_CAP_DELAY,

  4201.     NULL

  4202. };