falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
10458 Commits
32 Branches
850MB
Tree: ec5dc2c1af
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'ec5dc2c1af'
${ noResults }
FFmpeg/libavcodec/vc1.c

4194 lines
144KB
Raw Blame History 

  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2006-2007 Konstantin Shishkov

  4.  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file vc1.c

  25.  * VC-1 and WMV3 decoder

  26.  *

  27.  */

  28. #include "dsputil.h"

  29. #include "avcodec.h"

  30. #include "mpegvideo.h"

  31. #include "vc1.h"

  32. #include "vc1data.h"

  33. #include "vc1acdata.h"

  34. #include "msmpeg4data.h"

  35. 

  36. #undef NDEBUG

  37. #include <assert.h>

  38. 

  39. #define MB_INTRA_VLC_BITS 9

  40. #define DC_VLC_BITS 9

  41. #define AC_VLC_BITS 9

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

  43. 

  44. 

  45. /**

  46.  * Get unary code of limited length

  47.  * @todo FIXME Slow and ugly

  48.  * @param gb GetBitContext

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

  50.  * @param[in] len Maximum length

  51.  * @return Unary length/index

  52.  */

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

  54. {

  55. #if 1

  56.     int i;

  57. 

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

  59.     return i;

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

  61. 

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

  63.   {

  64.     tmp = get_bits(gb, 1);

  65.     i++;

  66.   }

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

  68.   return i;*/

  69. #else

  70.   unsigned int buf;

  71.   int log;

  72. 

  73.   OPEN_READER(re, gb);

  74.   UPDATE_CACHE(re, gb);

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

  76.   if (stop) buf = ~buf;

  77. 

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

  79.   if (log < limit){

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

  81.     CLOSE_READER(re, gb);

  82.     return log;

  83.   }

  84. 

  85.   LAST_SKIP_BITS(re, gb, limit);

  86.   CLOSE_READER(re, gb);

  87.   return limit;

  88. #endif

  89. }

  90. 

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

  92.     if (get_bits1(gb))

  93.         return 0;

  94.     else

  95.         return 2 - get_bits1(gb);

  96. }

  97. 

  98. /**

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

  100.  * @param v The VC1Context to initialize

  101.  * @return Status

  102.  */

  103. static int vc1_init_common(VC1Context *v)

  104. {

  105.     static int done = 0;

  106.     int i = 0;

  107. 

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

  109. 

  110.     /* VLC tables */

  111.     if(!done)

  112.     {

  113.         done = 1;

  114.         init_vlc(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  115.                  ff_vc1_bfraction_bits, 1, 1,

  116.                  ff_vc1_bfraction_codes, 1, 1, 1);

  117.         init_vlc(&ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  118.                  ff_vc1_norm2_bits, 1, 1,

  119.                  ff_vc1_norm2_codes, 1, 1, 1);

  120.         init_vlc(&ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  121.                  ff_vc1_norm6_bits, 1, 1,

  122.                  ff_vc1_norm6_codes, 2, 2, 1);

  123.         init_vlc(&ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  124.                  ff_vc1_imode_bits, 1, 1,

  125.                  ff_vc1_imode_codes, 1, 1, 1);

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

  127.         {

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

  129.                      ff_vc1_ttmb_bits[i], 1, 1,

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

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

  132.                      ff_vc1_ttblk_bits[i], 1, 1,

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

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

  135.                      ff_vc1_subblkpat_bits[i], 1, 1,

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

  137.         }

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

  139.         {

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

  141.                      ff_vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  144.                      ff_vc1_cbpcy_p_bits[i], 1, 1,

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

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

  147.                      ff_vc1_mv_diff_bits[i], 1, 1,

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

  149.         }

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

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

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

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

  154.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  157.     }

  158. 

  159.     /* Other defaults */

  160.     v->pq = -1;

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

  162. 

  163.     return 0;

  164. }

  165. 

  166. /***********************************************************************/

  167. /**

  168.  * @defgroup bitplane VC9 Bitplane decoding

  169.  * @see 8.7, p56

  170.  * @{

  171.  */

  172. 

  173. /** @addtogroup bitplane

  174.  * Imode types

  175.  * @{

  176.  */

  177. enum Imode {

  178.     IMODE_RAW,

  179.     IMODE_NORM2,

  180.     IMODE_DIFF2,

  181.     IMODE_NORM6,

  182.     IMODE_DIFF6,

  183.     IMODE_ROWSKIP,

  184.     IMODE_COLSKIP

  185. };

  186. /** @} */ //imode defines

  187. 

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

  189.  * @param plane Buffer to store decoded bits

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

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

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

  193.  */

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

  195.     int x, y;

  196. 

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

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

  199.             memset(plane, 0, width);

  200.         else

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

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

  203.         plane += stride;

  204.     }

  205. }

  206. 

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

  208.  * @param plane Buffer to store decoded bits

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

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

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

  212.  * @todo FIXME: Optimize

  213.  */

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

  215.     int x, y;

  216. 

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

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

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

  220.                 plane[y*stride] = 0;

  221.         else

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

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

  224.         plane ++;

  225.     }

  226. }

  227. 

  228. /** Decode a bitplane's bits

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

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

  231.  * @return Status

  232.  * @todo FIXME: Optimize

  233.  */

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

  235. {

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

  237. 

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

  239.     uint8_t invert, *planep = data;

  240.     int width, height, stride;

  241. 

  242.     width = v->s.mb_width;

  243.     height = v->s.mb_height;

  244.     stride = v->s.mb_stride;

  245.     invert = get_bits(gb, 1);

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

  247. 

  248.     *raw_flag = 0;

  249.     switch (imode)

  250.     {

  251.     case IMODE_RAW:

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

  253.         *raw_flag = 1; //invert ignored

  254.         return invert;

  255.     case IMODE_DIFF2:

  256.     case IMODE_NORM2:

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

  258.         {

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

  260.             offset = 1;

  261.         }

  262.         else offset = 0;

  263.         // decode bitplane as one long line

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

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

  266.             *planep++ = code & 1;

  267.             offset++;

  268.             if(offset == width) {

  269.                 offset = 0;

  270.                 planep += stride - width;

  271.             }

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

  273.             offset++;

  274.             if(offset == width) {

  275.                 offset = 0;

  276.                 planep += stride - width;

  277.             }

  278.         }

  279.         break;

  280.     case IMODE_DIFF6:

  281.     case IMODE_NORM6:

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

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

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

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

  286.                     if(code < 0){

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

  288.                         return -1;

  289.                     }

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

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

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

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

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

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

  296.                 }

  297.                 planep += stride * 3;

  298.             }

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

  300.         } else { // 3x2

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

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

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

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

  305.                     if(code < 0){

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

  307.                         return -1;

  308.                     }

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

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

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

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

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

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

  315.                 }

  316.                 planep += stride * 2;

  317.             }

  318.             x = width % 3;

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

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

  321.         }

  322.         break;

  323.     case IMODE_ROWSKIP:

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

  325.         break;

  326.     case IMODE_COLSKIP:

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

  328.         break;

  329.     default: break;

  330.     }

  331. 

  332.     /* Applying diff operator */

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

  334.     {

  335.         planep = data;

  336.         planep[0] ^= invert;

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

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

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

  340.         {

  341.             planep += stride;

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

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

  344.             {

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

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

  347.             }

  348.         }

  349.     }

  350.     else if (invert)

  351.     {

  352.         planep = data;

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

  354.     }

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

  356. }

  357. 

  358. /** @} */ //Bitplane group

  359. 

  360. /***********************************************************************/

  361. /** VOP Dquant decoding

  362.  * @param v VC-1 Context

  363.  */

  364. static int vop_dquant_decoding(VC1Context *v)

  365. {

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

  367.     int pqdiff;

  368. 

  369.     //variable size

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

  371.     {

  372.         pqdiff = get_bits(gb, 3);

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

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

  375.     }

  376.     else

  377.     {

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

  379.         if ( v->dquantfrm )

  380.         {

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

  382.             switch (v->dqprofile)

  383.             {

  384.             case DQPROFILE_SINGLE_EDGE:

  385.             case DQPROFILE_DOUBLE_EDGES:

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

  387.                 break;

  388.             case DQPROFILE_ALL_MBS:

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

  390.             default: break; //Forbidden ?

  391.             }

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

  393.             {

  394.                 pqdiff = get_bits(gb, 3);

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

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

  397.             }

  398.         }

  399.     }

  400.     return 0;

  401. }

  402. 

  403. /** Put block onto picture

  404.  */

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

  406. {

  407.     uint8_t *Y;

  408.     int ys, us, vs;

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

  410. 

  411.     if(v->rangeredfrm) {

  412.         int i, j, k;

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

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

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

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

  417. 

  418.     }

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

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

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

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

  423. 

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

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

  426.     Y += ys * 8;

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

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

  429. 

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

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

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

  433.     }

  434. }

  435. 

  436. /** Do motion compensation over 1 macroblock

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

  438.  */

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

  440. {

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

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

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

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

  445. 

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

  447. 

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

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

  450. 

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

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

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

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

  455.     }

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

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

  458.     if(v->fastuvmc) {

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

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

  461.     }

  462.     if(!dir) {

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

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

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

  466.     } else {

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

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

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

  470.     }

  471. 

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

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

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

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

  476. 

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

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

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

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

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

  482.     }else{

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

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

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

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

  487.     }

  488. 

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

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

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

  492. 

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

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

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

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

  497.     }

  498. 

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

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

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

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

  503. 

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

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

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

  507.         srcY = s->edge_emu_buffer;

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

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

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

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

  512.         srcU = uvbuf;

  513.         srcV = uvbuf + 16;

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

  515.         if(v->rangeredfrm) {

  516.             int i, j;

  517.             uint8_t *src, *src2;

  518. 

  519.             src = srcY;

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

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

  522.                 src += s->linesize;

  523.             }

  524.             src = srcU; src2 = srcV;

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

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

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

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

  529.                 }

  530.                 src += s->uvlinesize;

  531.                 src2 += s->uvlinesize;

  532.             }

  533.         }

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

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

  536.             int i, j;

  537.             uint8_t *src, *src2;

  538. 

  539.             src = srcY;

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

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

  542.                 src += s->linesize;

  543.             }

  544.             src = srcU; src2 = srcV;

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

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

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

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

  549.                 }

  550.                 src += s->uvlinesize;

  551.                 src2 += s->uvlinesize;

  552.             }

  553.         }

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

  555.     }

  556. 

  557.     if(s->mspel) {

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

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

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

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

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

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

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

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

  566. 

  567.         if(!v->rnd)

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

  569.         else

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

  571.     }

  572. 

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

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

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

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

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

  578.     if(!v->rnd){

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

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

  581.     }else{

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

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

  584.     }

  585. }

  586. 

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

  588.  */

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

  590. {

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

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

  593.     uint8_t *srcY;

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

  595.     int off;

  596. 

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

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

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

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

  601. 

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

  603. 

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

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

  606. 

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

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

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

  610.     }else{

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

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

  613.     }

  614. 

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

  616. 

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

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

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

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

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

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

  623.         srcY = s->edge_emu_buffer;

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

  625.         if(v->rangeredfrm) {

  626.             int i, j;

  627.             uint8_t *src;

  628. 

  629.             src = srcY;

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

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

  632.                 src += s->linesize;

  633.             }

  634.         }

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

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

  637.             int i, j;

  638.             uint8_t *src;

  639. 

  640.             src = srcY;

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

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

  643.                 src += s->linesize;

  644.             }

  645.         }

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

  647.     }

  648. 

  649.     if(s->mspel) {

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

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

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

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

  654.         if(!v->rnd)

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

  656.         else

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

  658.     }

  659. }

  660. 

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

  662. {

  663.     if(a < b) {

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

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

  666.     } else {

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

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

  669.     }

  670. }

  671. 

  672. 

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

  674.  */

  675. static void vc1_mc_4mv_chroma(VC1Context *v)

  676. {

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

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

  679.     uint8_t *srcU, *srcV;

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

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

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

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

  684. 

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

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

  687. 

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

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

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

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

  692.     }

  693. 

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

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

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

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

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

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

  700.         switch(idx) {

  701.         case 0x1:

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

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

  704.             break;

  705.         case 0x2:

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

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

  708.             break;

  709.         case 0x4:

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

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

  712.             break;

  713.         case 0x8:

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

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

  716.             break;

  717.         }

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

  719.         int t1 = 0, t2 = 0;

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

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

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

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

  724.     } else {

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

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

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

  728.     }

  729. 

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

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

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

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

  734.     if(v->fastuvmc) {

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

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

  737.     }

  738. 

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

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

  741. 

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

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

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

  745.     }else{

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

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

  748.     }

  749. 

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

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

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

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

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

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

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

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

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

  759.         srcU = s->edge_emu_buffer;

  760.         srcV = s->edge_emu_buffer + 16;

  761. 

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

  763.         if(v->rangeredfrm) {

  764.             int i, j;

  765.             uint8_t *src, *src2;

  766. 

  767.             src = srcU; src2 = srcV;

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

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

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

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

  772.                 }

  773.                 src += s->uvlinesize;

  774.                 src2 += s->uvlinesize;

  775.             }

  776.         }

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

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

  779.             int i, j;

  780.             uint8_t *src, *src2;

  781. 

  782.             src = srcU; src2 = srcV;

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

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

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

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

  787.                 }

  788.                 src += s->uvlinesize;

  789.                 src2 += s->uvlinesize;

  790.             }

  791.         }

  792.     }

  793. 

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

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

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

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

  798.     if(!v->rnd){

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

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

  801.     }else{

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

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

  804.     }

  805. }

  806. 

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

  808. 

  809. /**

  810.  * Decode Simple/Main Profiles sequence header

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

  812.  * @param avctx Codec context

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

  814.  * @return Status

  815.  */

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

  817. {

  818.     VC1Context *v = avctx->priv_data;

  819. 

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

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

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

  823.     {

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

  825.     }

  826. 

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

  828.     {

  829.         return decode_sequence_header_adv(v, gb);

  830.     }

  831.     else

  832.     {

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

  834.         if (v->res_sm)

  835.         {

  836.             av_log(avctx, AV_LOG_ERROR,

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

  838.             return -1;

  839.         }

  840.     }

  841. 

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

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

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

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

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

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

  848.     {

  849.         av_log(avctx, AV_LOG_ERROR,

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

  851.     }

  852. 

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

  854.     if (v->res_x8)

  855.     {

  856.         av_log(avctx, AV_LOG_ERROR,

  857.                "1 for reserved RES_X8 is forbidden\n");

  858.         //return -1;

  859.     }

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

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

  862.     if (!v->res_fasttx)

  863.     {

  864.         av_log(avctx, AV_LOG_ERROR,

  865.                "0 for reserved RES_FASTTX is forbidden\n");

  866.         //return -1;

  867.     }

  868. 

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

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

  871.     {

  872.         av_log(avctx, AV_LOG_ERROR,

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

  874.         return -1;

  875.     }

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

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

  878.     {

  879.         av_log(avctx, AV_LOG_ERROR,

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

  881.         return -1;

  882.     }

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

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

  885. 

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

  887.     if (v->res_transtab)

  888.     {

  889.         av_log(avctx, AV_LOG_ERROR,

  890.                "1 for reserved RES_TRANSTAB is forbidden\n");

  891.         return -1;

  892.     }

  893. 

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

  895. 

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

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

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

  899.     {

  900.         av_log(avctx, AV_LOG_INFO,

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

  902.     }

  903. 

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

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

  906. 

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

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

  909.     if (!v->res_rtm_flag)

  910.     {

  911. //            av_log(avctx, AV_LOG_ERROR,

  912. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  913.         av_log(avctx, AV_LOG_ERROR,

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

  915.         //return -1;

  916.     }

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

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

  919.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  928.                );

  929.     return 0;

  930. }

  931. 

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

  933. {

  934.     v->res_rtm_flag = 1;

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

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

  937.     {

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

  939.     }

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

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

  942.     {

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

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

  945.         return -1;

  946.     }

  947. 

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

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

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

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

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

  953. 

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

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

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

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

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

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

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

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

  962.     get_bits1(gb); // reserved

  963. 

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

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

  966. 

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

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

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

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

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

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

  973.                v->tfcntrflag, v->finterpflag

  974.                );

  975. 

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

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

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

  979.         return -1;

  980.     }

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

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

  983.         int w, h, ar = 0;

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

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

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

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

  988.         if(get_bits1(gb))

  989.             ar = get_bits(gb, 4);

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

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

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

  993.             w = get_bits(gb, 8);

  994.             h = get_bits(gb, 8);

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

  996.         }

  997. 

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

  999.             if(get_bits1(gb)) {

  1000.                 v->s.avctx->time_base.num = 32;

  1001.                 v->s.avctx->time_base.den = get_bits(gb, 16) + 1;

  1002.             } else {

  1003.                 int nr, dr;

  1004.                 nr = get_bits(gb, 8);

  1005.                 dr = get_bits(gb, 4);

  1006.                 if(nr && nr < 8 && dr && dr < 3){

  1007.                     v->s.avctx->time_base.num = ff_vc1_fps_dr[dr - 1];

  1008.                     v->s.avctx->time_base.den = ff_vc1_fps_nr[nr - 1] * 1000;

  1009.                 }

  1010.             }

  1011.         }

  1012. 

  1013.         if(get_bits1(gb)){

  1014.             v->color_prim = get_bits(gb, 8);

  1015.             v->transfer_char = get_bits(gb, 8);

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

  1017.         }

  1018.     }

  1019. 

  1020.     v->hrd_param_flag = get_bits1(gb);

  1021.     if(v->hrd_param_flag) {

  1022.         int i;

  1023.         v->hrd_num_leaky_buckets = get_bits(gb, 5);

  1024.         get_bits(gb, 4); //bitrate exponent

  1025.         get_bits(gb, 4); //buffer size exponent

  1026.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1027.             get_bits(gb, 16); //hrd_rate[n]

  1028.             get_bits(gb, 16); //hrd_buffer[n]

  1029.         }

  1030.     }

  1031.     return 0;

  1032. }

  1033. 

  1034. static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)

  1035. {

  1036.     VC1Context *v = avctx->priv_data;

  1037.     int i, blink, clentry, refdist;

  1038. 

  1039.     av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));

  1040.     blink = get_bits1(gb); // broken link

  1041.     clentry = get_bits1(gb); // closed entry

  1042.     v->panscanflag = get_bits1(gb);

  1043.     refdist = get_bits1(gb); // refdist flag

  1044.     v->s.loop_filter = get_bits1(gb);

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

  1046.     v->extended_mv = get_bits1(gb);

  1047.     v->dquant = get_bits(gb, 2);

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

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

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

  1051. 

  1052.     if(v->hrd_param_flag){

  1053.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1054.             get_bits(gb, 8); //hrd_full[n]

  1055.         }

  1056.     }

  1057. 

  1058.     if(get_bits1(gb)){

  1059.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

  1060.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1061.     }

  1062.     if(v->extended_mv)

  1063.         v->extended_dmv = get_bits1(gb);

  1064.     if(get_bits1(gb)) {

  1065.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1066.         skip_bits(gb, 3); // Y range, ignored for now

  1067.     }

  1068.     if(get_bits1(gb)) {

  1069.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1070.         skip_bits(gb, 3); // UV range, ignored for now

  1071.     }

  1072. 

  1073.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1074.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1075.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1076.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1077.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1078.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1079. 

  1080.     return 0;

  1081. }

  1082. 

  1083. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1084. {

  1085.     int pqindex, lowquant, status;

  1086. 

  1087.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1088.     skip_bits(gb, 2); //framecnt unused

  1089.     v->rangeredfrm = 0;

  1090.     if (v->rangered) v->rangeredfrm = get_bits(gb, 1);

  1091.     v->s.pict_type = get_bits(gb, 1);

  1092.     if (v->s.avctx->max_b_frames) {

  1093.         if (!v->s.pict_type) {

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

  1095.             else v->s.pict_type = B_TYPE;

  1096.         } else v->s.pict_type = P_TYPE;

  1097.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1098. 

  1099.     v->bi_type = 0;

  1100.     if(v->s.pict_type == B_TYPE) {

  1101.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1102.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1103.         if(v->bfraction == 0) {

  1104.             v->s.pict_type = BI_TYPE;

  1105.         }

  1106.     }

  1107.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1108.         get_bits(gb, 7); // skip buffer fullness

  1109. 

  1110.     /* calculate RND */

  1111.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1112.         v->rnd = 1;

  1113.     if(v->s.pict_type == P_TYPE)

  1114.         v->rnd ^= 1;

  1115. 

  1116.     /* Quantizer stuff */

  1117.     pqindex = get_bits(gb, 5);

  1118.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1119.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1120.     else

  1121.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1122. 

  1123.     v->pquantizer = 1;

  1124.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1125.         v->pquantizer = pqindex < 9;

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

  1127.         v->pquantizer = 0;

  1128.     v->pqindex = pqindex;

  1129.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1130.     else v->halfpq = 0;

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

  1132.         v->pquantizer = get_bits(gb, 1);

  1133.     v->dquantfrm = 0;

  1134.     if (v->extended_mv == 1) v->mvrange = get_prefix(gb, 0, 3);

  1135.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1136.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1137.     v->range_x = 1 << (v->k_x - 1);

  1138.     v->range_y = 1 << (v->k_y - 1);

  1139.     if (v->profile == PROFILE_ADVANCED)

  1140.     {

  1141.         if (v->postprocflag) v->postproc = get_bits(gb, 1);

  1142.     }

  1143.     else

  1144.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1145. 

  1146.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1147.         if(get_bits1(gb))return -1;

  1148.     }

  1149. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1150. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1151. 

  1152.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1153. 

  1154.     switch(v->s.pict_type) {

  1155.     case P_TYPE:

  1156.         if (v->pq < 5) v->tt_index = 0;

  1157.         else if(v->pq < 13) v->tt_index = 1;

  1158.         else v->tt_index = 2;

  1159. 

  1160.         lowquant = (v->pq > 12) ? 0 : 1;

  1161.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1162.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1163.         {

  1164.             int scale, shift, i;

  1165.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1166.             v->lumscale = get_bits(gb, 6);

  1167.             v->lumshift = get_bits(gb, 6);

  1168.             v->use_ic = 1;

  1169.             /* fill lookup tables for intensity compensation */

  1170.             if(!v->lumscale) {

  1171.                 scale = -64;

  1172.                 shift = (255 - v->lumshift * 2) << 6;

  1173.                 if(v->lumshift > 31)

  1174.                     shift += 128 << 6;

  1175.             } else {

  1176.                 scale = v->lumscale + 32;

  1177.                 if(v->lumshift > 31)

  1178.                     shift = (v->lumshift - 64) << 6;

  1179.                 else

  1180.                     shift = v->lumshift << 6;

  1181.             }

  1182.             for(i = 0; i < 256; i++) {

  1183.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1184.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1185.             }

  1186.         }

  1187.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1188.             v->s.quarter_sample = 0;

  1189.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1190.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1191.                 v->s.quarter_sample = 0;

  1192.             else

  1193.                 v->s.quarter_sample = 1;

  1194.         } else

  1195.             v->s.quarter_sample = 1;

  1196.         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));

  1197. 

  1198.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1199.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1200.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1201.         {

  1202.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1203.             if (status < 0) return -1;

  1204.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1205.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1206.         } else {

  1207.             v->mv_type_is_raw = 0;

  1208.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1209.         }

  1210.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

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

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

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

  1214. 

  1215.         /* Hopefully this is correct for P frames */

  1216.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1217.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1218. 

  1219.         if (v->dquant)

  1220.         {

  1221.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1222.             vop_dquant_decoding(v);

  1223.         }

  1224. 

  1225.         v->ttfrm = 0; //FIXME Is that so ?

  1226.         if (v->vstransform)

  1227.         {

  1228.             v->ttmbf = get_bits(gb, 1);

  1229.             if (v->ttmbf)

  1230.             {

  1231.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1232.             }

  1233.         } else {

  1234.             v->ttmbf = 1;

  1235.             v->ttfrm = TT_8X8;

  1236.         }

  1237.         break;

  1238.     case B_TYPE:

  1239.         if (v->pq < 5) v->tt_index = 0;

  1240.         else if(v->pq < 13) v->tt_index = 1;

  1241.         else v->tt_index = 2;

  1242. 

  1243.         lowquant = (v->pq > 12) ? 0 : 1;

  1244.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1245.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1246.         v->s.mspel = v->s.quarter_sample;

  1247. 

  1248.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1249.         if (status < 0) return -1;

  1250.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1251.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1252.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1253.         if (status < 0) return -1;

  1254.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1255.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1256. 

  1257.         v->s.mv_table_index = get_bits(gb, 2);

  1258.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1259. 

  1260.         if (v->dquant)

  1261.         {

  1262.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1263.             vop_dquant_decoding(v);

  1264.         }

  1265. 

  1266.         v->ttfrm = 0;

  1267.         if (v->vstransform)

  1268.         {

  1269.             v->ttmbf = get_bits(gb, 1);

  1270.             if (v->ttmbf)

  1271.             {

  1272.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1273.             }

  1274.         } else {

  1275.             v->ttmbf = 1;

  1276.             v->ttfrm = TT_8X8;

  1277.         }

  1278.         break;

  1279.     }

  1280. 

  1281.     /* AC Syntax */

  1282.     v->c_ac_table_index = decode012(gb);

  1283.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1284.     {

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

  1286.     }

  1287.     /* DC Syntax */

  1288.     v->s.dc_table_index = get_bits(gb, 1);

  1289. 

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

  1291.         v->s.pict_type = B_TYPE;

  1292.         v->bi_type = 1;

  1293.     }

  1294.     return 0;

  1295. }

  1296. 

  1297. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1298. {

  1299.     int pqindex, lowquant;

  1300.     int status;

  1301. 

  1302.     v->p_frame_skipped = 0;

  1303. 

  1304.     if(v->interlace){

  1305.         v->fcm = decode012(gb);

  1306.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1307.     }

  1308.     switch(get_prefix(gb, 0, 4)) {

  1309.     case 0:

  1310.         v->s.pict_type = P_TYPE;

  1311.         break;

  1312.     case 1:

  1313.         v->s.pict_type = B_TYPE;

  1314.         break;

  1315.     case 2:

  1316.         v->s.pict_type = I_TYPE;

  1317.         break;

  1318.     case 3:

  1319.         v->s.pict_type = BI_TYPE;

  1320.         break;

  1321.     case 4:

  1322.         v->s.pict_type = P_TYPE; // skipped pic

  1323.         v->p_frame_skipped = 1;

  1324.         return 0;

  1325.     }

  1326.     if(v->tfcntrflag)

  1327.         get_bits(gb, 8);

  1328.     if(v->broadcast) {

  1329.         if(!v->interlace || v->psf) {

  1330.             v->rptfrm = get_bits(gb, 2);

  1331.         } else {

  1332.             v->tff = get_bits1(gb);

  1333.             v->rptfrm = get_bits1(gb);

  1334.         }

  1335.     }

  1336.     if(v->panscanflag) {

  1337.         //...

  1338.     }

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

  1340.     if(v->interlace)

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

  1342.     if(v->finterpflag) v->interpfrm = get_bits(gb, 1);

  1343.     if(v->s.pict_type == B_TYPE) {

  1344.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1345.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1346.         if(v->bfraction == 0) {

  1347.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1348.         }

  1349.     }

  1350.     pqindex = get_bits(gb, 5);

  1351.     v->pqindex = pqindex;

  1352.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1353.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1354.     else

  1355.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1356. 

  1357.     v->pquantizer = 1;

  1358.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1359.         v->pquantizer = pqindex < 9;

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

  1361.         v->pquantizer = 0;

  1362.     v->pqindex = pqindex;

  1363.     if (pqindex < 9) v->halfpq = get_bits(gb, 1);

  1364.     else v->halfpq = 0;

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

  1366.         v->pquantizer = get_bits(gb, 1);

  1367. 

  1368.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1369. 

  1370.     switch(v->s.pict_type) {

  1371.     case I_TYPE:

  1372.     case BI_TYPE:

  1373.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1374.         if (status < 0) return -1;

  1375.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1376.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1377.         v->condover = CONDOVER_NONE;

  1378.         if(v->overlap && v->pq <= 8) {

  1379.             v->condover = decode012(gb);

  1380.             if(v->condover == CONDOVER_SELECT) {

  1381.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

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

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

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

  1385.             }

  1386.         }

  1387.         break;

  1388.     case P_TYPE:

  1389.         if(v->postprocflag)

  1390.             v->postproc = get_bits1(gb);

  1391.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1392.         else v->mvrange = 0;

  1393.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1394.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1395.         v->range_x = 1 << (v->k_x - 1);

  1396.         v->range_y = 1 << (v->k_y - 1);

  1397. 

  1398.         if (v->pq < 5) v->tt_index = 0;

  1399.         else if(v->pq < 13) v->tt_index = 1;

  1400.         else v->tt_index = 2;

  1401. 

  1402.         lowquant = (v->pq > 12) ? 0 : 1;

  1403.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];

  1404.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1405.         {

  1406.             int scale, shift, i;

  1407.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];

  1408.             v->lumscale = get_bits(gb, 6);

  1409.             v->lumshift = get_bits(gb, 6);

  1410.             /* fill lookup tables for intensity compensation */

  1411.             if(!v->lumscale) {

  1412.                 scale = -64;

  1413.                 shift = (255 - v->lumshift * 2) << 6;

  1414.                 if(v->lumshift > 31)

  1415.                     shift += 128 << 6;

  1416.             } else {

  1417.                 scale = v->lumscale + 32;

  1418.                 if(v->lumshift > 31)

  1419.                     shift = (v->lumshift - 64) << 6;

  1420.                 else

  1421.                     shift = v->lumshift << 6;

  1422.             }

  1423.             for(i = 0; i < 256; i++) {

  1424.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1425.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1426.             }

  1427.             v->use_ic = 1;

  1428.         }

  1429.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1430.             v->s.quarter_sample = 0;

  1431.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1432.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1433.                 v->s.quarter_sample = 0;

  1434.             else

  1435.                 v->s.quarter_sample = 1;

  1436.         } else

  1437.             v->s.quarter_sample = 1;

  1438.         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));

  1439. 

  1440.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1441.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1442.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1443.         {

  1444.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1445.             if (status < 0) return -1;

  1446.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1447.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1448.         } else {

  1449.             v->mv_type_is_raw = 0;

  1450.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1451.         }

  1452.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

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

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

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

  1456. 

  1457.         /* Hopefully this is correct for P frames */

  1458.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1459.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1460.         if (v->dquant)

  1461.         {

  1462.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1463.             vop_dquant_decoding(v);

  1464.         }

  1465. 

  1466.         v->ttfrm = 0; //FIXME Is that so ?

  1467.         if (v->vstransform)

  1468.         {

  1469.             v->ttmbf = get_bits(gb, 1);

  1470.             if (v->ttmbf)

  1471.             {

  1472.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1473.             }

  1474.         } else {

  1475.             v->ttmbf = 1;

  1476.             v->ttfrm = TT_8X8;

  1477.         }

  1478.         break;

  1479.     case B_TYPE:

  1480.         if(v->postprocflag)

  1481.             v->postproc = get_bits1(gb);

  1482.         if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);

  1483.         else v->mvrange = 0;

  1484.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1485.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1486.         v->range_x = 1 << (v->k_x - 1);

  1487.         v->range_y = 1 << (v->k_y - 1);

  1488. 

  1489.         if (v->pq < 5) v->tt_index = 0;

  1490.         else if(v->pq < 13) v->tt_index = 1;

  1491.         else v->tt_index = 2;

  1492. 

  1493.         lowquant = (v->pq > 12) ? 0 : 1;

  1494.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1495.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1496.         v->s.mspel = v->s.quarter_sample;

  1497. 

  1498.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1499.         if (status < 0) return -1;

  1500.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1501.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1502.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1503.         if (status < 0) return -1;

  1504.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1505.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1506. 

  1507.         v->s.mv_table_index = get_bits(gb, 2);

  1508.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1509. 

  1510.         if (v->dquant)

  1511.         {

  1512.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1513.             vop_dquant_decoding(v);

  1514.         }

  1515. 

  1516.         v->ttfrm = 0;

  1517.         if (v->vstransform)

  1518.         {

  1519.             v->ttmbf = get_bits(gb, 1);

  1520.             if (v->ttmbf)

  1521.             {

  1522.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1523.             }

  1524.         } else {

  1525.             v->ttmbf = 1;

  1526.             v->ttfrm = TT_8X8;

  1527.         }

  1528.         break;

  1529.     }

  1530. 

  1531.     /* AC Syntax */

  1532.     v->c_ac_table_index = decode012(gb);

  1533.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1534.     {

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

  1536.     }

  1537.     /* DC Syntax */

  1538.     v->s.dc_table_index = get_bits(gb, 1);

  1539.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1540.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1541.         vop_dquant_decoding(v);

  1542.     }

  1543. 

  1544.     v->bi_type = 0;

  1545.     if(v->s.pict_type == BI_TYPE) {

  1546.         v->s.pict_type = B_TYPE;

  1547.         v->bi_type = 1;

  1548.     }

  1549.     return 0;

  1550. }

  1551. 

  1552. /***********************************************************************/

  1553. /**

  1554.  * @defgroup block VC-1 Block-level functions

  1555.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1556.  * @{

  1557.  */

  1558. 

  1559. /**

  1560.  * @def GET_MQUANT

  1561.  * @brief Get macroblock-level quantizer scale

  1562.  */

  1563. #define GET_MQUANT()                                           \

  1564.   if (v->dquantfrm)                                            \

  1565.   {                                                            \

  1566.     int edges = 0;                                             \

  1567.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1568.     {                                                          \

  1569.       if (v->dqbilevel)                                        \

  1570.       {                                                        \

  1571.         mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \

  1572.       }                                                        \

  1573.       else                                                     \

  1574.       {                                                        \

  1575.         mqdiff = get_bits(gb, 3);                              \

  1576.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1577.         else mquant = get_bits(gb, 5);                         \

  1578.       }                                                        \

  1579.     }                                                          \

  1580.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1581.         edges = 1 << v->dqsbedge;                              \

  1582.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1583.         edges = (3 << v->dqsbedge) % 15;                       \

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

  1585.         edges = 15;                                            \

  1586.     if((edges&1) && !s->mb_x)                                  \

  1587.         mquant = v->altpq;                                     \

  1588.     if((edges&2) && s->first_slice_line)                       \

  1589.         mquant = v->altpq;                                     \

  1590.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1591.         mquant = v->altpq;                                     \

  1592.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1593.         mquant = v->altpq;                                     \

  1594.   }

  1595. 

  1596. /**

  1597.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1598.  * @brief Get MV differentials

  1599.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1600.  * @param _dmv_x Horizontal differential for decoded MV

  1601.  * @param _dmv_y Vertical differential for decoded MV

  1602.  */

  1603. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1604.   index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table,\

  1605.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1606.   if (index > 36)                                                   \

  1607.   {                                                                 \

  1608.     mb_has_coeffs = 1;                                              \

  1609.     index -= 37;                                                    \

  1610.   }                                                                 \

  1611.   else mb_has_coeffs = 0;                                           \

  1612.   s->mb_intra = 0;                                                  \

  1613.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1614.   else if (index == 35)                                             \

  1615.   {                                                                 \

  1616.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1617.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1618.   }                                                                 \

  1619.   else if (index == 36)                                             \

  1620.   {                                                                 \

  1621.     _dmv_x = 0;                                                     \

  1622.     _dmv_y = 0;                                                     \

  1623.     s->mb_intra = 1;                                                \

  1624.   }                                                                 \

  1625.   else                                                              \

  1626.   {                                                                 \

  1627.     index1 = index%6;                                               \

  1628.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1629.     else                                   val = 0;                 \

  1630.     if(size_table[index1] - val > 0)                                \

  1631.         val = get_bits(gb, size_table[index1] - val);               \

  1632.     else                                   val = 0;                 \

  1633.     sign = 0 - (val&1);                                             \

  1634.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1635.                                                                     \

  1636.     index1 = index/6;                                               \

  1637.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1638.     else                                   val = 0;                 \

  1639.     if(size_table[index1] - val > 0)                                \

  1640.         val = get_bits(gb, size_table[index1] - val);               \

  1641.     else                                   val = 0;                 \

  1642.     sign = 0 - (val&1);                                             \

  1643.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1644.   }

  1645. 

  1646. /** Predict and set motion vector

  1647.  */

  1648. 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)

  1649. {

  1650.     int xy, wrap, off = 0;

  1651.     int16_t *A, *B, *C;

  1652.     int px, py;

  1653.     int sum;

  1654. 

  1655.     /* scale MV difference to be quad-pel */

  1656.     dmv_x <<= 1 - s->quarter_sample;

  1657.     dmv_y <<= 1 - s->quarter_sample;

  1658. 

  1659.     wrap = s->b8_stride;

  1660.     xy = s->block_index[n];

  1661. 

  1662.     if(s->mb_intra){

  1663.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1664.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1665.         s->current_picture.motion_val[1][xy][0] = 0;

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

  1667.         if(mv1) { /* duplicate motion data for 1-MV block */

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

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

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

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

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

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

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

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

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

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

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

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

  1680.         }

  1681.         return;

  1682.     }

  1683. 

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

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

  1686.     if(mv1)

  1687.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1688.     else {

  1689.         //in 4-MV mode different blocks have different B predictor position

  1690.         switch(n){

  1691.         case 0:

  1692.             off = (s->mb_x > 0) ? -1 : 1;

  1693.             break;

  1694.         case 1:

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

  1696.             break;

  1697.         case 2:

  1698.             off = 1;

  1699.             break;

  1700.         case 3:

  1701.             off = -1;

  1702.         }

  1703.     }

  1704.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1705. 

  1706.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1707.         if(s->mb_width == 1) {

  1708.             px = A[0];

  1709.             py = A[1];

  1710.         } else {

  1711.             px = mid_pred(A[0], B[0], C[0]);

  1712.             py = mid_pred(A[1], B[1], C[1]);

  1713.         }

  1714.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1715.         px = C[0];

  1716.         py = C[1];

  1717.     } else {

  1718.         px = py = 0;

  1719.     }

  1720.     /* Pullback MV as specified in 8.3.5.3.4 */

  1721.     {

  1722.         int qx, qy, X, Y;

  1723.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1724.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1725.         X = (s->mb_width << 6) - 4;

  1726.         Y = (s->mb_height << 6) - 4;

  1727.         if(mv1) {

  1728.             if(qx + px < -60) px = -60 - qx;

  1729.             if(qy + py < -60) py = -60 - qy;

  1730.         } else {

  1731.             if(qx + px < -28) px = -28 - qx;

  1732.             if(qy + py < -28) py = -28 - qy;

  1733.         }

  1734.         if(qx + px > X) px = X - qx;

  1735.         if(qy + py > Y) py = Y - qy;

  1736.     }

  1737.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1738.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1739.         if(is_intra[xy - wrap])

  1740.             sum = FFABS(px) + FFABS(py);

  1741.         else

  1742.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1743.         if(sum > 32) {

  1744.             if(get_bits1(&s->gb)) {

  1745.                 px = A[0];

  1746.                 py = A[1];

  1747.             } else {

  1748.                 px = C[0];

  1749.                 py = C[1];

  1750.             }

  1751.         } else {

  1752.             if(is_intra[xy - 1])

  1753.                 sum = FFABS(px) + FFABS(py);

  1754.             else

  1755.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1756.             if(sum > 32) {

  1757.                 if(get_bits1(&s->gb)) {

  1758.                     px = A[0];

  1759.                     py = A[1];

  1760.                 } else {

  1761.                     px = C[0];

  1762.                     py = C[1];

  1763.                 }

  1764.             }

  1765.         }

  1766.     }

  1767.     /* store MV using signed modulus of MV range defined in 4.11 */

  1768.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1769.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1770.     if(mv1) { /* duplicate motion data for 1-MV block */

  1771.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1772.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

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

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

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

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

  1777.     }

  1778. }

  1779. 

  1780. /** Motion compensation for direct or interpolated blocks in B-frames

  1781.  */

  1782. static void vc1_interp_mc(VC1Context *v)

  1783. {

  1784.     MpegEncContext *s = &v->s;

  1785.     DSPContext *dsp = &v->s.dsp;

  1786.     uint8_t *srcY, *srcU, *srcV;

  1787.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1788. 

  1789.     if(!v->s.next_picture.data[0])return;

  1790. 

  1791.     mx = s->mv[1][0][0];

  1792.     my = s->mv[1][0][1];

  1793.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1794.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1795.     if(v->fastuvmc) {

  1796.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  1797.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  1798.     }

  1799.     srcY = s->next_picture.data[0];

  1800.     srcU = s->next_picture.data[1];

  1801.     srcV = s->next_picture.data[2];

  1802. 

  1803.     src_x = s->mb_x * 16 + (mx >> 2);

  1804.     src_y = s->mb_y * 16 + (my >> 2);

  1805.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1806.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1807. 

  1808.     if(v->profile != PROFILE_ADVANCED){

  1809.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1810.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1811.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1812.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1813.     }else{

  1814.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1815.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1816.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1817.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1818.     }

  1819. 

  1820.     srcY += src_y * s->linesize + src_x;

  1821.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1822.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1823. 

  1824.     /* for grayscale we should not try to read from unknown area */

  1825.     if(s->flags & CODEC_FLAG_GRAY) {

  1826.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1827.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1828.     }

  1829. 

  1830.     if(v->rangeredfrm

  1831.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1832.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1833.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1834. 

  1835.         srcY -= s->mspel * (1 + s->linesize);

  1836.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  1837.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1838.         srcY = s->edge_emu_buffer;

  1839.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1840.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1841.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1842.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1843.         srcU = uvbuf;

  1844.         srcV = uvbuf + 16;

  1845.         /* if we deal with range reduction we need to scale source blocks */

  1846.         if(v->rangeredfrm) {

  1847.             int i, j;

  1848.             uint8_t *src, *src2;

  1849. 

  1850.             src = srcY;

  1851.             for(j = 0; j < 17 + s->mspel*2; j++) {

  1852.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1853.                 src += s->linesize;

  1854.             }

  1855.             src = srcU; src2 = srcV;

  1856.             for(j = 0; j < 9; j++) {

  1857.                 for(i = 0; i < 9; i++) {

  1858.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1859.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1860.                 }

  1861.                 src += s->uvlinesize;

  1862.                 src2 += s->uvlinesize;

  1863.             }

  1864.         }

  1865.         srcY += s->mspel * (1 + s->linesize);

  1866.     }

  1867. 

  1868.     mx >>= 1;

  1869.     my >>= 1;

  1870.     dxy = ((my & 1) << 1) | (mx & 1);

  1871. 

  1872.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1873. 

  1874.     if(s->flags & CODEC_FLAG_GRAY) return;

  1875.     /* Chroma MC always uses qpel blilinear */

  1876.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1877.     uvmx = (uvmx&3)<<1;

  1878.     uvmy = (uvmy&3)<<1;

  1879.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1880.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1881. }

  1882. 

  1883. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1884. {

  1885.     int n = bfrac;

  1886. 

  1887. #if B_FRACTION_DEN==256

  1888.     if(inv)

  1889.         n -= 256;

  1890.     if(!qs)

  1891.         return 2 * ((value * n + 255) >> 9);

  1892.     return (value * n + 128) >> 8;

  1893. #else

  1894.     if(inv)

  1895.         n -= B_FRACTION_DEN;

  1896.     if(!qs)

  1897.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1898.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1899. #endif

  1900. }

  1901. 

  1902. /** Reconstruct motion vector for B-frame and do motion compensation

  1903.  */

  1904. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1905. {

  1906.     if(v->use_ic) {

  1907.         v->mv_mode2 = v->mv_mode;

  1908.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  1909.     }

  1910.     if(direct) {

  1911.         vc1_mc_1mv(v, 0);

  1912.         vc1_interp_mc(v);

  1913.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1914.         return;

  1915.     }

  1916.     if(mode == BMV_TYPE_INTERPOLATED) {

  1917.         vc1_mc_1mv(v, 0);

  1918.         vc1_interp_mc(v);

  1919.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1920.         return;

  1921.     }

  1922. 

  1923.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  1924.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  1925.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  1926. }

  1927. 

  1928. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  1929. {

  1930.     MpegEncContext *s = &v->s;

  1931.     int xy, wrap, off = 0;

  1932.     int16_t *A, *B, *C;

  1933.     int px, py;

  1934.     int sum;

  1935.     int r_x, r_y;

  1936.     const uint8_t *is_intra = v->mb_type[0];

  1937. 

  1938.     r_x = v->range_x;

  1939.     r_y = v->range_y;

  1940.     /* scale MV difference to be quad-pel */

  1941.     dmv_x[0] <<= 1 - s->quarter_sample;

  1942.     dmv_y[0] <<= 1 - s->quarter_sample;

  1943.     dmv_x[1] <<= 1 - s->quarter_sample;

  1944.     dmv_y[1] <<= 1 - s->quarter_sample;

  1945. 

  1946.     wrap = s->b8_stride;

  1947.     xy = s->block_index[0];

  1948. 

  1949.     if(s->mb_intra) {

  1950.         s->current_picture.motion_val[0][xy][0] =

  1951.         s->current_picture.motion_val[0][xy][1] =

  1952.         s->current_picture.motion_val[1][xy][0] =

  1953.         s->current_picture.motion_val[1][xy][1] = 0;

  1954.         return;

  1955.     }

  1956.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  1957.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  1958.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  1959.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  1960. 

  1961.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  1962.     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));

  1963.     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));

  1964.     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));

  1965.     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));

  1966.     if(direct) {

  1967.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  1968.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  1969.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  1970.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  1971.         return;

  1972.     }

  1973. 

  1974.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  1975.         C = s->current_picture.motion_val[0][xy - 2];

  1976.         A = s->current_picture.motion_val[0][xy - wrap*2];

  1977.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1978.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  1979. 

  1980.         if(!s->mb_x) C[0] = C[1] = 0;

  1981.         if(!s->first_slice_line) { // predictor A is not out of bounds

  1982.             if(s->mb_width == 1) {

  1983.                 px = A[0];

  1984.                 py = A[1];

  1985.             } else {

  1986.                 px = mid_pred(A[0], B[0], C[0]);

  1987.                 py = mid_pred(A[1], B[1], C[1]);

  1988.             }

  1989.         } else if(s->mb_x) { // predictor C is not out of bounds

  1990.             px = C[0];

  1991.             py = C[1];

  1992.         } else {

  1993.             px = py = 0;

  1994.         }

  1995.         /* Pullback MV as specified in 8.3.5.3.4 */

  1996.         {

  1997.             int qx, qy, X, Y;

  1998.             if(v->profile < PROFILE_ADVANCED) {

  1999.                 qx = (s->mb_x << 5);

  2000.                 qy = (s->mb_y << 5);

  2001.                 X = (s->mb_width << 5) - 4;

  2002.                 Y = (s->mb_height << 5) - 4;

  2003.                 if(qx + px < -28) px = -28 - qx;

  2004.                 if(qy + py < -28) py = -28 - qy;

  2005.                 if(qx + px > X) px = X - qx;

  2006.                 if(qy + py > Y) py = Y - qy;

  2007.             } else {

  2008.                 qx = (s->mb_x << 6);

  2009.                 qy = (s->mb_y << 6);

  2010.                 X = (s->mb_width << 6) - 4;

  2011.                 Y = (s->mb_height << 6) - 4;

  2012.                 if(qx + px < -60) px = -60 - qx;

  2013.                 if(qy + py < -60) py = -60 - qy;

  2014.                 if(qx + px > X) px = X - qx;

  2015.                 if(qy + py > Y) py = Y - qy;

  2016.             }

  2017.         }

  2018.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2019.         if(0 && !s->first_slice_line && s->mb_x) {

  2020.             if(is_intra[xy - wrap])

  2021.                 sum = FFABS(px) + FFABS(py);

  2022.             else

  2023.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2024.             if(sum > 32) {

  2025.                 if(get_bits1(&s->gb)) {

  2026.                     px = A[0];

  2027.                     py = A[1];

  2028.                 } else {

  2029.                     px = C[0];

  2030.                     py = C[1];

  2031.                 }

  2032.             } else {

  2033.                 if(is_intra[xy - 2])

  2034.                     sum = FFABS(px) + FFABS(py);

  2035.                 else

  2036.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2037.                 if(sum > 32) {

  2038.                     if(get_bits1(&s->gb)) {

  2039.                         px = A[0];

  2040.                         py = A[1];

  2041.                     } else {

  2042.                         px = C[0];

  2043.                         py = C[1];

  2044.                     }

  2045.                 }

  2046.             }

  2047.         }

  2048.         /* store MV using signed modulus of MV range defined in 4.11 */

  2049.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2050.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2051.     }

  2052.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2053.         C = s->current_picture.motion_val[1][xy - 2];

  2054.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2055.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2056.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2057. 

  2058.         if(!s->mb_x) C[0] = C[1] = 0;

  2059.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2060.             if(s->mb_width == 1) {

  2061.                 px = A[0];

  2062.                 py = A[1];

  2063.             } else {

  2064.                 px = mid_pred(A[0], B[0], C[0]);

  2065.                 py = mid_pred(A[1], B[1], C[1]);

  2066.             }

  2067.         } else if(s->mb_x) { // predictor C is not out of bounds

  2068.             px = C[0];

  2069.             py = C[1];

  2070.         } else {

  2071.             px = py = 0;

  2072.         }

  2073.         /* Pullback MV as specified in 8.3.5.3.4 */

  2074.         {

  2075.             int qx, qy, X, Y;

  2076.             if(v->profile < PROFILE_ADVANCED) {

  2077.                 qx = (s->mb_x << 5);

  2078.                 qy = (s->mb_y << 5);

  2079.                 X = (s->mb_width << 5) - 4;

  2080.                 Y = (s->mb_height << 5) - 4;

  2081.                 if(qx + px < -28) px = -28 - qx;

  2082.                 if(qy + py < -28) py = -28 - qy;

  2083.                 if(qx + px > X) px = X - qx;

  2084.                 if(qy + py > Y) py = Y - qy;

  2085.             } else {

  2086.                 qx = (s->mb_x << 6);

  2087.                 qy = (s->mb_y << 6);

  2088.                 X = (s->mb_width << 6) - 4;

  2089.                 Y = (s->mb_height << 6) - 4;

  2090.                 if(qx + px < -60) px = -60 - qx;

  2091.                 if(qy + py < -60) py = -60 - qy;

  2092.                 if(qx + px > X) px = X - qx;

  2093.                 if(qy + py > Y) py = Y - qy;

  2094.             }

  2095.         }

  2096.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2097.         if(0 && !s->first_slice_line && s->mb_x) {

  2098.             if(is_intra[xy - wrap])

  2099.                 sum = FFABS(px) + FFABS(py);

  2100.             else

  2101.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2102.             if(sum > 32) {

  2103.                 if(get_bits1(&s->gb)) {

  2104.                     px = A[0];

  2105.                     py = A[1];

  2106.                 } else {

  2107.                     px = C[0];

  2108.                     py = C[1];

  2109.                 }

  2110.             } else {

  2111.                 if(is_intra[xy - 2])

  2112.                     sum = FFABS(px) + FFABS(py);

  2113.                 else

  2114.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2115.                 if(sum > 32) {

  2116.                     if(get_bits1(&s->gb)) {

  2117.                         px = A[0];

  2118.                         py = A[1];

  2119.                     } else {

  2120.                         px = C[0];

  2121.                         py = C[1];

  2122.                     }

  2123.                 }

  2124.             }

  2125.         }

  2126.         /* store MV using signed modulus of MV range defined in 4.11 */

  2127. 

  2128.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2129.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2130.     }

  2131.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2132.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2133.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2134.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2135. }

  2136. 

  2137. /** Get predicted DC value for I-frames only

  2138.  * prediction dir: left=0, top=1

  2139.  * @param s MpegEncContext

  2140.  * @param[in] n block index in the current MB

  2141.  * @param dc_val_ptr Pointer to DC predictor

  2142.  * @param dir_ptr Prediction direction for use in AC prediction

  2143.  */

  2144. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2145.                               int16_t **dc_val_ptr, int *dir_ptr)

  2146. {

  2147.     int a, b, c, wrap, pred, scale;

  2148.     int16_t *dc_val;

  2149.     static const uint16_t dcpred[32] = {

  2150.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2151.          114,  102,   93,   85,   79,   73,   68,   64,

  2152.           60,   57,   54,   51,   49,   47,   45,   43,

  2153.           41,   39,   38,   37,   35,   34,   33

  2154.     };

  2155. 

  2156.     /* find prediction - wmv3_dc_scale always used here in fact */

  2157.     if (n < 4)     scale = s->y_dc_scale;

  2158.     else           scale = s->c_dc_scale;

  2159. 

  2160.     wrap = s->block_wrap[n];

  2161.     dc_val= s->dc_val[0] + s->block_index[n];

  2162. 

  2163.     /* B A

  2164.      * C X

  2165.      */

  2166.     c = dc_val[ - 1];

  2167.     b = dc_val[ - 1 - wrap];

  2168.     a = dc_val[ - wrap];

  2169. 

  2170.     if (pq < 9 || !overlap)

  2171.     {

  2172.         /* Set outer values */

  2173.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2174.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2175.     }

  2176.     else

  2177.     {

  2178.         /* Set outer values */

  2179.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2180.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2181.     }

  2182. 

  2183.     if (abs(a - b) <= abs(b - c)) {

  2184.         pred = c;

  2185.         *dir_ptr = 1;//left

  2186.     } else {

  2187.         pred = a;

  2188.         *dir_ptr = 0;//top

  2189.     }

  2190. 

  2191.     /* update predictor */

  2192.     *dc_val_ptr = &dc_val[0];

  2193.     return pred;

  2194. }

  2195. 

  2196. 

  2197. /** Get predicted DC value

  2198.  * prediction dir: left=0, top=1

  2199.  * @param s MpegEncContext

  2200.  * @param[in] n block index in the current MB

  2201.  * @param dc_val_ptr Pointer to DC predictor

  2202.  * @param dir_ptr Prediction direction for use in AC prediction

  2203.  */

  2204. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2205.                               int a_avail, int c_avail,

  2206.                               int16_t **dc_val_ptr, int *dir_ptr)

  2207. {

  2208.     int a, b, c, wrap, pred, scale;

  2209.     int16_t *dc_val;

  2210.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2211.     int q1, q2 = 0;

  2212. 

  2213.     /* find prediction - wmv3_dc_scale always used here in fact */

  2214.     if (n < 4)     scale = s->y_dc_scale;

  2215.     else           scale = s->c_dc_scale;

  2216. 

  2217.     wrap = s->block_wrap[n];

  2218.     dc_val= s->dc_val[0] + s->block_index[n];

  2219. 

  2220.     /* B A

  2221.      * C X

  2222.      */

  2223.     c = dc_val[ - 1];

  2224.     b = dc_val[ - 1 - wrap];

  2225.     a = dc_val[ - wrap];

  2226.     /* scale predictors if needed */

  2227.     q1 = s->current_picture.qscale_table[mb_pos];

  2228.     if(c_avail && (n!= 1 && n!=3)) {

  2229.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2230.         if(q2 && q2 != q1)

  2231.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2232.     }

  2233.     if(a_avail && (n!= 2 && n!=3)) {

  2234.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2235.         if(q2 && q2 != q1)

  2236.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2237.     }

  2238.     if(a_avail && c_avail && (n!=3)) {

  2239.         int off = mb_pos;

  2240.         if(n != 1) off--;

  2241.         if(n != 2) off -= s->mb_stride;

  2242.         q2 = s->current_picture.qscale_table[off];

  2243.         if(q2 && q2 != q1)

  2244.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2245.     }

  2246. 

  2247.     if(a_avail && c_avail) {

  2248.         if(abs(a - b) <= abs(b - c)) {

  2249.             pred = c;

  2250.             *dir_ptr = 1;//left

  2251.         } else {

  2252.             pred = a;

  2253.             *dir_ptr = 0;//top

  2254.         }

  2255.     } else if(a_avail) {

  2256.         pred = a;

  2257.         *dir_ptr = 0;//top

  2258.     } else if(c_avail) {

  2259.         pred = c;

  2260.         *dir_ptr = 1;//left

  2261.     } else {

  2262.         pred = 0;

  2263.         *dir_ptr = 1;//left

  2264.     }

  2265. 

  2266.     /* update predictor */

  2267.     *dc_val_ptr = &dc_val[0];

  2268.     return pred;

  2269. }

  2270. 

  2271. 

  2272. /**

  2273.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2274.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2275.  * @{

  2276.  */

  2277. 

  2278. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2279. {

  2280.     int xy, wrap, pred, a, b, c;

  2281. 

  2282.     xy = s->block_index[n];

  2283.     wrap = s->b8_stride;

  2284. 

  2285.     /* B C

  2286.      * A X

  2287.      */

  2288.     a = s->coded_block[xy - 1       ];

  2289.     b = s->coded_block[xy - 1 - wrap];

  2290.     c = s->coded_block[xy     - wrap];

  2291. 

  2292.     if (b == c) {

  2293.         pred = a;

  2294.     } else {

  2295.         pred = c;

  2296.     }

  2297. 

  2298.     /* store value */

  2299.     *coded_block_ptr = &s->coded_block[xy];

  2300. 

  2301.     return pred;

  2302. }

  2303. 

  2304. /**

  2305.  * Decode one AC coefficient

  2306.  * @param v The VC1 context

  2307.  * @param last Last coefficient

  2308.  * @param skip How much zero coefficients to skip

  2309.  * @param value Decoded AC coefficient value

  2310.  * @see 8.1.3.4

  2311.  */

  2312. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2313. {

  2314.     GetBitContext *gb = &v->s.gb;

  2315.     int index, escape, run = 0, level = 0, lst = 0;

  2316. 

  2317.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2318.     if (index != vc1_ac_sizes[codingset] - 1) {

  2319.         run = vc1_index_decode_table[codingset][index][0];

  2320.         level = vc1_index_decode_table[codingset][index][1];

  2321.         lst = index >= vc1_last_decode_table[codingset];

  2322.         if(get_bits(gb, 1))

  2323.             level = -level;

  2324.     } else {

  2325.         escape = decode210(gb);

  2326.         if (escape != 2) {

  2327.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2328.             run = vc1_index_decode_table[codingset][index][0];

  2329.             level = vc1_index_decode_table[codingset][index][1];

  2330.             lst = index >= vc1_last_decode_table[codingset];

  2331.             if(escape == 0) {

  2332.                 if(lst)

  2333.                     level += vc1_last_delta_level_table[codingset][run];

  2334.                 else

  2335.                     level += vc1_delta_level_table[codingset][run];

  2336.             } else {

  2337.                 if(lst)

  2338.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2339.                 else

  2340.                     run += vc1_delta_run_table[codingset][level] + 1;

  2341.             }

  2342.             if(get_bits(gb, 1))

  2343.                 level = -level;

  2344.         } else {

  2345.             int sign;

  2346.             lst = get_bits(gb, 1);

  2347.             if(v->s.esc3_level_length == 0) {

  2348.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2349.                     v->s.esc3_level_length = get_bits(gb, 3);

  2350.                     if(!v->s.esc3_level_length)

  2351.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2352.                 } else { //table 60

  2353.                     v->s.esc3_level_length = get_prefix(gb, 1, 6) + 2;

  2354.                 }

  2355.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2356.             }

  2357.             run = get_bits(gb, v->s.esc3_run_length);

  2358.             sign = get_bits(gb, 1);

  2359.             level = get_bits(gb, v->s.esc3_level_length);

  2360.             if(sign)

  2361.                 level = -level;

  2362.         }

  2363.     }

  2364. 

  2365.     *last = lst;

  2366.     *skip = run;

  2367.     *value = level;

  2368. }

  2369. 

  2370. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2371.  * @param v VC1Context

  2372.  * @param block block to decode

  2373.  * @param coded are AC coeffs present or not

  2374.  * @param codingset set of VLC to decode data

  2375.  */

  2376. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2377. {

  2378.     GetBitContext *gb = &v->s.gb;

  2379.     MpegEncContext *s = &v->s;

  2380.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2381.     int run_diff, i;

  2382.     int16_t *dc_val;

  2383.     int16_t *ac_val, *ac_val2;

  2384.     int dcdiff;

  2385. 

  2386.     /* Get DC differential */

  2387.     if (n < 4) {

  2388.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2389.     } else {

  2390.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2391.     }

  2392.     if (dcdiff < 0){

  2393.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2394.         return -1;

  2395.     }

  2396.     if (dcdiff)

  2397.     {

  2398.         if (dcdiff == 119 /* ESC index value */)

  2399.         {

  2400.             /* TODO: Optimize */

  2401.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2402.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2403.             else dcdiff = get_bits(gb, 8);

  2404.         }

  2405.         else

  2406.         {

  2407.             if (v->pq == 1)

  2408.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2409.             else if (v->pq == 2)

  2410.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2411.         }

  2412.         if (get_bits(gb, 1))

  2413.             dcdiff = -dcdiff;

  2414.     }

  2415. 

  2416.     /* Prediction */

  2417.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2418.     *dc_val = dcdiff;

  2419. 

  2420.     /* Store the quantized DC coeff, used for prediction */

  2421.     if (n < 4) {

  2422.         block[0] = dcdiff * s->y_dc_scale;

  2423.     } else {

  2424.         block[0] = dcdiff * s->c_dc_scale;

  2425.     }

  2426.     /* Skip ? */

  2427.     run_diff = 0;

  2428.     i = 0;

  2429.     if (!coded) {

  2430.         goto not_coded;

  2431.     }

  2432. 

  2433.     //AC Decoding

  2434.     i = 1;

  2435. 

  2436.     {

  2437.         int last = 0, skip, value;

  2438.         const int8_t *zz_table;

  2439.         int scale;

  2440.         int k;

  2441. 

  2442.         scale = v->pq * 2 + v->halfpq;

  2443. 

  2444.         if(v->s.ac_pred) {

  2445.             if(!dc_pred_dir)

  2446.                 zz_table = ff_vc1_horizontal_zz;

  2447.             else

  2448.                 zz_table = ff_vc1_vertical_zz;

  2449.         } else

  2450.             zz_table = ff_vc1_normal_zz;

  2451. 

  2452.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2453.         ac_val2 = ac_val;

  2454.         if(dc_pred_dir) //left

  2455.             ac_val -= 16;

  2456.         else //top

  2457.             ac_val -= 16 * s->block_wrap[n];

  2458. 

  2459.         while (!last) {

  2460.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2461.             i += skip;

  2462.             if(i > 63)

  2463.                 break;

  2464.             block[zz_table[i++]] = value;

  2465.         }

  2466. 

  2467.         /* apply AC prediction if needed */

  2468.         if(s->ac_pred) {

  2469.             if(dc_pred_dir) { //left

  2470.                 for(k = 1; k < 8; k++)

  2471.                     block[k << 3] += ac_val[k];

  2472.             } else { //top

  2473.                 for(k = 1; k < 8; k++)

  2474.                     block[k] += ac_val[k + 8];

  2475.             }

  2476.         }

  2477.         /* save AC coeffs for further prediction */

  2478.         for(k = 1; k < 8; k++) {

  2479.             ac_val2[k] = block[k << 3];

  2480.             ac_val2[k + 8] = block[k];

  2481.         }

  2482. 

  2483.         /* scale AC coeffs */

  2484.         for(k = 1; k < 64; k++)

  2485.             if(block[k]) {

  2486.                 block[k] *= scale;

  2487.                 if(!v->pquantizer)

  2488.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2489.             }

  2490. 

  2491.         if(s->ac_pred) i = 63;

  2492.     }

  2493. 

  2494. not_coded:

  2495.     if(!coded) {

  2496.         int k, scale;

  2497.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2498.         ac_val2 = ac_val;

  2499. 

  2500.         scale = v->pq * 2 + v->halfpq;

  2501.         memset(ac_val2, 0, 16 * 2);

  2502.         if(dc_pred_dir) {//left

  2503.             ac_val -= 16;

  2504.             if(s->ac_pred)

  2505.                 memcpy(ac_val2, ac_val, 8 * 2);

  2506.         } else {//top

  2507.             ac_val -= 16 * s->block_wrap[n];

  2508.             if(s->ac_pred)

  2509.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2510.         }

  2511. 

  2512.         /* apply AC prediction if needed */

  2513.         if(s->ac_pred) {

  2514.             if(dc_pred_dir) { //left

  2515.                 for(k = 1; k < 8; k++) {

  2516.                     block[k << 3] = ac_val[k] * scale;

  2517.                     if(!v->pquantizer && block[k << 3])

  2518.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2519.                 }

  2520.             } else { //top

  2521.                 for(k = 1; k < 8; k++) {

  2522.                     block[k] = ac_val[k + 8] * scale;

  2523.                     if(!v->pquantizer && block[k])

  2524.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2525.                 }

  2526.             }

  2527.             i = 63;

  2528.         }

  2529.     }

  2530.     s->block_last_index[n] = i;

  2531. 

  2532.     return 0;

  2533. }

  2534. 

  2535. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2536.  * @param v VC1Context

  2537.  * @param block block to decode

  2538.  * @param coded are AC coeffs present or not

  2539.  * @param codingset set of VLC to decode data

  2540.  */

  2541. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2542. {

  2543.     GetBitContext *gb = &v->s.gb;

  2544.     MpegEncContext *s = &v->s;

  2545.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2546.     int run_diff, i;

  2547.     int16_t *dc_val;

  2548.     int16_t *ac_val, *ac_val2;

  2549.     int dcdiff;

  2550.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2551.     int use_pred = s->ac_pred;

  2552.     int scale;

  2553.     int q1, q2 = 0;

  2554.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2555. 

  2556.     /* Get DC differential */

  2557.     if (n < 4) {

  2558.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2559.     } else {

  2560.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2561.     }

  2562.     if (dcdiff < 0){

  2563.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2564.         return -1;

  2565.     }

  2566.     if (dcdiff)

  2567.     {

  2568.         if (dcdiff == 119 /* ESC index value */)

  2569.         {

  2570.             /* TODO: Optimize */

  2571.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2572.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2573.             else dcdiff = get_bits(gb, 8);

  2574.         }

  2575.         else

  2576.         {

  2577.             if (mquant == 1)

  2578.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2579.             else if (mquant == 2)

  2580.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2581.         }

  2582.         if (get_bits(gb, 1))

  2583.             dcdiff = -dcdiff;

  2584.     }

  2585. 

  2586.     /* Prediction */

  2587.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2588.     *dc_val = dcdiff;

  2589. 

  2590.     /* Store the quantized DC coeff, used for prediction */

  2591.     if (n < 4) {

  2592.         block[0] = dcdiff * s->y_dc_scale;

  2593.     } else {

  2594.         block[0] = dcdiff * s->c_dc_scale;

  2595.     }

  2596.     /* Skip ? */

  2597.     run_diff = 0;

  2598.     i = 0;

  2599. 

  2600.     //AC Decoding

  2601.     i = 1;

  2602. 

  2603.     /* check if AC is needed at all */

  2604.     if(!a_avail && !c_avail) use_pred = 0;

  2605.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2606.     ac_val2 = ac_val;

  2607. 

  2608.     scale = mquant * 2 + v->halfpq;

  2609. 

  2610.     if(dc_pred_dir) //left

  2611.         ac_val -= 16;

  2612.     else //top

  2613.         ac_val -= 16 * s->block_wrap[n];

  2614. 

  2615.     q1 = s->current_picture.qscale_table[mb_pos];

  2616.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2617.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2618.     if(dc_pred_dir && n==1) q2 = q1;

  2619.     if(!dc_pred_dir && n==2) q2 = q1;

  2620.     if(n==3) q2 = q1;

  2621. 

  2622.     if(coded) {

  2623.         int last = 0, skip, value;

  2624.         const int8_t *zz_table;

  2625.         int k;

  2626. 

  2627.         if(v->s.ac_pred) {

  2628.             if(!dc_pred_dir)

  2629.                 zz_table = ff_vc1_horizontal_zz;

  2630.             else

  2631.                 zz_table = ff_vc1_vertical_zz;

  2632.         } else

  2633.             zz_table = ff_vc1_normal_zz;

  2634. 

  2635.         while (!last) {

  2636.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2637.             i += skip;

  2638.             if(i > 63)

  2639.                 break;

  2640.             block[zz_table[i++]] = value;

  2641.         }

  2642. 

  2643.         /* apply AC prediction if needed */

  2644.         if(use_pred) {

  2645.             /* scale predictors if needed*/

  2646.             if(q2 && q1!=q2) {

  2647.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2648.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2649. 

  2650.                 if(dc_pred_dir) { //left

  2651.                     for(k = 1; k < 8; k++)

  2652.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2653.                 } else { //top

  2654.                     for(k = 1; k < 8; k++)

  2655.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2656.                 }

  2657.             } else {

  2658.                 if(dc_pred_dir) { //left

  2659.                     for(k = 1; k < 8; k++)

  2660.                         block[k << 3] += ac_val[k];

  2661.                 } else { //top

  2662.                     for(k = 1; k < 8; k++)

  2663.                         block[k] += ac_val[k + 8];

  2664.                 }

  2665.             }

  2666.         }

  2667.         /* save AC coeffs for further prediction */

  2668.         for(k = 1; k < 8; k++) {

  2669.             ac_val2[k] = block[k << 3];

  2670.             ac_val2[k + 8] = block[k];

  2671.         }

  2672. 

  2673.         /* scale AC coeffs */

  2674.         for(k = 1; k < 64; k++)

  2675.             if(block[k]) {

  2676.                 block[k] *= scale;

  2677.                 if(!v->pquantizer)

  2678.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2679.             }

  2680. 

  2681.         if(use_pred) i = 63;

  2682.     } else { // no AC coeffs

  2683.         int k;

  2684. 

  2685.         memset(ac_val2, 0, 16 * 2);

  2686.         if(dc_pred_dir) {//left

  2687.             if(use_pred) {

  2688.                 memcpy(ac_val2, ac_val, 8 * 2);

  2689.                 if(q2 && q1!=q2) {

  2690.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2691.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2692.                     for(k = 1; k < 8; k++)

  2693.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2694.                 }

  2695.             }

  2696.         } else {//top

  2697.             if(use_pred) {

  2698.                 memcpy(ac_val2 + 8, ac_val + 8, 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 + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2704.                 }

  2705.             }

  2706.         }

  2707. 

  2708.         /* apply AC prediction if needed */

  2709.         if(use_pred) {

  2710.             if(dc_pred_dir) { //left

  2711.                 for(k = 1; k < 8; k++) {

  2712.                     block[k << 3] = ac_val2[k] * scale;

  2713.                     if(!v->pquantizer && block[k << 3])

  2714.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2715.                 }

  2716.             } else { //top

  2717.                 for(k = 1; k < 8; k++) {

  2718.                     block[k] = ac_val2[k + 8] * scale;

  2719.                     if(!v->pquantizer && block[k])

  2720.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2721.                 }

  2722.             }

  2723.             i = 63;

  2724.         }

  2725.     }

  2726.     s->block_last_index[n] = i;

  2727. 

  2728.     return 0;

  2729. }

  2730. 

  2731. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2732.  * @param v VC1Context

  2733.  * @param block block to decode

  2734.  * @param coded are AC coeffs present or not

  2735.  * @param mquant block quantizer

  2736.  * @param codingset set of VLC to decode data

  2737.  */

  2738. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2739. {

  2740.     GetBitContext *gb = &v->s.gb;

  2741.     MpegEncContext *s = &v->s;

  2742.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2743.     int run_diff, i;

  2744.     int16_t *dc_val;

  2745.     int16_t *ac_val, *ac_val2;

  2746.     int dcdiff;

  2747.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2748.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2749.     int use_pred = s->ac_pred;

  2750.     int scale;

  2751.     int q1, q2 = 0;

  2752. 

  2753.     /* XXX: Guard against dumb values of mquant */

  2754.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2755. 

  2756.     /* Set DC scale - y and c use the same */

  2757.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2758.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2759. 

  2760.     /* Get DC differential */

  2761.     if (n < 4) {

  2762.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2763.     } else {

  2764.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2765.     }

  2766.     if (dcdiff < 0){

  2767.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2768.         return -1;

  2769.     }

  2770.     if (dcdiff)

  2771.     {

  2772.         if (dcdiff == 119 /* ESC index value */)

  2773.         {

  2774.             /* TODO: Optimize */

  2775.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2776.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2777.             else dcdiff = get_bits(gb, 8);

  2778.         }

  2779.         else

  2780.         {

  2781.             if (mquant == 1)

  2782.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2783.             else if (mquant == 2)

  2784.                 dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;

  2785.         }

  2786.         if (get_bits(gb, 1))

  2787.             dcdiff = -dcdiff;

  2788.     }

  2789. 

  2790.     /* Prediction */

  2791.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2792.     *dc_val = dcdiff;

  2793. 

  2794.     /* Store the quantized DC coeff, used for prediction */

  2795. 

  2796.     if (n < 4) {

  2797.         block[0] = dcdiff * s->y_dc_scale;

  2798.     } else {

  2799.         block[0] = dcdiff * s->c_dc_scale;

  2800.     }

  2801.     /* Skip ? */

  2802.     run_diff = 0;

  2803.     i = 0;

  2804. 

  2805.     //AC Decoding

  2806.     i = 1;

  2807. 

  2808.     /* check if AC is needed at all and adjust direction if needed */

  2809.     if(!a_avail) dc_pred_dir = 1;

  2810.     if(!c_avail) dc_pred_dir = 0;

  2811.     if(!a_avail && !c_avail) use_pred = 0;

  2812.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2813.     ac_val2 = ac_val;

  2814. 

  2815.     scale = mquant * 2 + v->halfpq;

  2816. 

  2817.     if(dc_pred_dir) //left

  2818.         ac_val -= 16;

  2819.     else //top

  2820.         ac_val -= 16 * s->block_wrap[n];

  2821. 

  2822.     q1 = s->current_picture.qscale_table[mb_pos];

  2823.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2824.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2825.     if(dc_pred_dir && n==1) q2 = q1;

  2826.     if(!dc_pred_dir && n==2) q2 = q1;

  2827.     if(n==3) q2 = q1;

  2828. 

  2829.     if(coded) {

  2830.         int last = 0, skip, value;

  2831.         const int8_t *zz_table;

  2832.         int k;

  2833. 

  2834.         zz_table = ff_vc1_simple_progressive_8x8_zz;

  2835. 

  2836.         while (!last) {

  2837.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2838.             i += skip;

  2839.             if(i > 63)

  2840.                 break;

  2841.             block[zz_table[i++]] = value;

  2842.         }

  2843. 

  2844.         /* apply AC prediction if needed */

  2845.         if(use_pred) {

  2846.             /* scale predictors if needed*/

  2847.             if(q2 && q1!=q2) {

  2848.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2849.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2850. 

  2851.                 if(dc_pred_dir) { //left

  2852.                     for(k = 1; k < 8; k++)

  2853.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2854.                 } else { //top

  2855.                     for(k = 1; k < 8; k++)

  2856.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2857.                 }

  2858.             } else {

  2859.                 if(dc_pred_dir) { //left

  2860.                     for(k = 1; k < 8; k++)

  2861.                         block[k << 3] += ac_val[k];

  2862.                 } else { //top

  2863.                     for(k = 1; k < 8; k++)

  2864.                         block[k] += ac_val[k + 8];

  2865.                 }

  2866.             }

  2867.         }

  2868.         /* save AC coeffs for further prediction */

  2869.         for(k = 1; k < 8; k++) {

  2870.             ac_val2[k] = block[k << 3];

  2871.             ac_val2[k + 8] = block[k];

  2872.         }

  2873. 

  2874.         /* scale AC coeffs */

  2875.         for(k = 1; k < 64; k++)

  2876.             if(block[k]) {

  2877.                 block[k] *= scale;

  2878.                 if(!v->pquantizer)

  2879.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2880.             }

  2881. 

  2882.         if(use_pred) i = 63;

  2883.     } else { // no AC coeffs

  2884.         int k;

  2885. 

  2886.         memset(ac_val2, 0, 16 * 2);

  2887.         if(dc_pred_dir) {//left

  2888.             if(use_pred) {

  2889.                 memcpy(ac_val2, ac_val, 8 * 2);

  2890.                 if(q2 && q1!=q2) {

  2891.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2892.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2893.                     for(k = 1; k < 8; k++)

  2894.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2895.                 }

  2896.             }

  2897.         } else {//top

  2898.             if(use_pred) {

  2899.                 memcpy(ac_val2 + 8, ac_val + 8, 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 + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2905.                 }

  2906.             }

  2907.         }

  2908. 

  2909.         /* apply AC prediction if needed */

  2910.         if(use_pred) {

  2911.             if(dc_pred_dir) { //left

  2912.                 for(k = 1; k < 8; k++) {

  2913.                     block[k << 3] = ac_val2[k] * scale;

  2914.                     if(!v->pquantizer && block[k << 3])

  2915.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2916.                 }

  2917.             } else { //top

  2918.                 for(k = 1; k < 8; k++) {

  2919.                     block[k] = ac_val2[k + 8] * scale;

  2920.                     if(!v->pquantizer && block[k])

  2921.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2922.                 }

  2923.             }

  2924.             i = 63;

  2925.         }

  2926.     }

  2927.     s->block_last_index[n] = i;

  2928. 

  2929.     return 0;

  2930. }

  2931. 

  2932. /** Decode P block

  2933.  */

  2934. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2935. {

  2936.     MpegEncContext *s = &v->s;

  2937.     GetBitContext *gb = &s->gb;

  2938.     int i, j;

  2939.     int subblkpat = 0;

  2940.     int scale, off, idx, last, skip, value;

  2941.     int ttblk = ttmb & 7;

  2942. 

  2943.     if(ttmb == -1) {

  2944.         ttblk = ff_vc1_ttblk_to_tt[v->tt_index][get_vlc2(gb, ff_vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  2945.     }

  2946.     if(ttblk == TT_4X4) {

  2947.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2948.     }

  2949.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2950.         subblkpat = decode012(gb);

  2951.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2952.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2953.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2954.     }

  2955.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  2956. 

  2957.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2958.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2959.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2960.         ttblk = TT_8X4;

  2961.     }

  2962.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2963.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2964.         ttblk = TT_4X8;

  2965.     }

  2966.     switch(ttblk) {

  2967.     case TT_8X8:

  2968.         i = 0;

  2969.         last = 0;

  2970.         while (!last) {

  2971.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2972.             i += skip;

  2973.             if(i > 63)

  2974.                 break;

  2975.             idx = ff_vc1_simple_progressive_8x8_zz[i++];

  2976.             block[idx] = value * scale;

  2977.             if(!v->pquantizer)

  2978.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2979.         }

  2980.         s->dsp.vc1_inv_trans_8x8(block);

  2981.         break;

  2982.     case TT_4X4:

  2983.         for(j = 0; j < 4; j++) {

  2984.             last = subblkpat & (1 << (3 - j));

  2985.             i = 0;

  2986.             off = (j & 1) * 4 + (j & 2) * 16;

  2987.             while (!last) {

  2988.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2989.                 i += skip;

  2990.                 if(i > 15)

  2991.                     break;

  2992.                 idx = ff_vc1_simple_progressive_4x4_zz[i++];

  2993.                 block[idx + off] = value * scale;

  2994.                 if(!v->pquantizer)

  2995.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2996.             }

  2997.             if(!(subblkpat & (1 << (3 - j))))

  2998.                 s->dsp.vc1_inv_trans_4x4(block, j);

  2999.         }

  3000.         break;

  3001.     case TT_8X4:

  3002.         for(j = 0; j < 2; j++) {

  3003.             last = subblkpat & (1 << (1 - j));

  3004.             i = 0;

  3005.             off = j * 32;

  3006.             while (!last) {

  3007.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3008.                 i += skip;

  3009.                 if(i > 31)

  3010.                     break;

  3011.                 if(v->profile < PROFILE_ADVANCED)

  3012.                     idx = ff_vc1_simple_progressive_8x4_zz[i++];

  3013.                 else

  3014.                     idx = ff_vc1_adv_progressive_8x4_zz[i++];

  3015.                 block[idx + off] = value * scale;

  3016.                 if(!v->pquantizer)

  3017.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3018.             }

  3019.             if(!(subblkpat & (1 << (1 - j))))

  3020.                 s->dsp.vc1_inv_trans_8x4(block, j);

  3021.         }

  3022.         break;

  3023.     case TT_4X8:

  3024.         for(j = 0; j < 2; j++) {

  3025.             last = subblkpat & (1 << (1 - j));

  3026.             i = 0;

  3027.             off = j * 4;

  3028.             while (!last) {

  3029.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  3030.                 i += skip;

  3031.                 if(i > 31)

  3032.                     break;

  3033.                 if(v->profile < PROFILE_ADVANCED)

  3034.                     idx = ff_vc1_simple_progressive_4x8_zz[i++];

  3035.                 else

  3036.                     idx = ff_vc1_adv_progressive_4x8_zz[i++];

  3037.                 block[idx + off] = value * scale;

  3038.                 if(!v->pquantizer)

  3039.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  3040.             }

  3041.             if(!(subblkpat & (1 << (1 - j))))

  3042.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3043.         }

  3044.         break;

  3045.     }

  3046.     return 0;

  3047. }

  3048. 

  3049. 

  3050. /** Decode one P-frame MB (in Simple/Main profile)

  3051.  */

  3052. static int vc1_decode_p_mb(VC1Context *v)

  3053. {

  3054.     MpegEncContext *s = &v->s;

  3055.     GetBitContext *gb = &s->gb;

  3056.     int i, j;

  3057.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3058.     int cbp; /* cbp decoding stuff */

  3059.     int mqdiff, mquant; /* MB quantization */

  3060.     int ttmb = v->ttfrm; /* MB Transform type */

  3061.     int status;

  3062. 

  3063.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3064.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3065.     int mb_has_coeffs = 1; /* last_flag */

  3066.     int dmv_x, dmv_y; /* Differential MV components */

  3067.     int index, index1; /* LUT indices */

  3068.     int val, sign; /* temp values */

  3069.     int first_block = 1;

  3070.     int dst_idx, off;

  3071.     int skipped, fourmv;

  3072. 

  3073.     mquant = v->pq; /* Loosy initialization */

  3074. 

  3075.     if (v->mv_type_is_raw)

  3076.         fourmv = get_bits1(gb);

  3077.     else

  3078.         fourmv = v->mv_type_mb_plane[mb_pos];

  3079.     if (v->skip_is_raw)

  3080.         skipped = get_bits1(gb);

  3081.     else

  3082.         skipped = v->s.mbskip_table[mb_pos];

  3083. 

  3084.     s->dsp.clear_blocks(s->block[0]);

  3085. 

  3086.     if (!fourmv) /* 1MV mode */

  3087.     {

  3088.         if (!skipped)

  3089.         {

  3090.             GET_MVDATA(dmv_x, dmv_y);

  3091. 

  3092.             if (s->mb_intra) {

  3093.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3094.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3095.             }

  3096.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3097.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3098. 

  3099.             /* FIXME Set DC val for inter block ? */

  3100.             if (s->mb_intra && !mb_has_coeffs)

  3101.             {

  3102.                 GET_MQUANT();

  3103.                 s->ac_pred = get_bits(gb, 1);

  3104.                 cbp = 0;

  3105.             }

  3106.             else if (mb_has_coeffs)

  3107.             {

  3108.                 if (s->mb_intra) s->ac_pred = get_bits(gb, 1);

  3109.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3110.                 GET_MQUANT();

  3111.             }

  3112.             else

  3113.             {

  3114.                 mquant = v->pq;

  3115.                 cbp = 0;

  3116.             }

  3117.             s->current_picture.qscale_table[mb_pos] = mquant;

  3118. 

  3119.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3120.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3121.                                 VC1_TTMB_VLC_BITS, 2);

  3122.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3123.             dst_idx = 0;

  3124.             for (i=0; i<6; i++)

  3125.             {

  3126.                 s->dc_val[0][s->block_index[i]] = 0;

  3127.                 dst_idx += i >> 2;

  3128.                 val = ((cbp >> (5 - i)) & 1);

  3129.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3130.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3131.                 if(s->mb_intra) {

  3132.                     /* check if prediction blocks A and C are available */

  3133.                     v->a_avail = v->c_avail = 0;

  3134.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3135.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3136.                     if(i == 1 || i == 3 || s->mb_x)

  3137.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3138. 

  3139.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3140.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3141.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3142.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3143.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3144.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3145.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3146.                     if(v->pq >= 9 && v->overlap) {

  3147.                         if(v->c_avail)

  3148.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3149.                         if(v->a_avail)

  3150.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3151.                     }

  3152.                 } else if(val) {

  3153.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3154.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3155.                     first_block = 0;

  3156.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3157.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3158.                 }

  3159.             }

  3160.         }

  3161.         else //Skipped

  3162.         {

  3163.             s->mb_intra = 0;

  3164.             for(i = 0; i < 6; i++) {

  3165.                 v->mb_type[0][s->block_index[i]] = 0;

  3166.                 s->dc_val[0][s->block_index[i]] = 0;

  3167.             }

  3168.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3169.             s->current_picture.qscale_table[mb_pos] = 0;

  3170.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3171.             vc1_mc_1mv(v, 0);

  3172.             return 0;

  3173.         }

  3174.     } //1MV mode

  3175.     else //4MV mode

  3176.     {

  3177.         if (!skipped /* unskipped MB */)

  3178.         {

  3179.             int intra_count = 0, coded_inter = 0;

  3180.             int is_intra[6], is_coded[6];

  3181.             /* Get CBPCY */

  3182.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3183.             for (i=0; i<6; i++)

  3184.             {

  3185.                 val = ((cbp >> (5 - i)) & 1);

  3186.                 s->dc_val[0][s->block_index[i]] = 0;

  3187.                 s->mb_intra = 0;

  3188.                 if(i < 4) {

  3189.                     dmv_x = dmv_y = 0;

  3190.                     s->mb_intra = 0;

  3191.                     mb_has_coeffs = 0;

  3192.                     if(val) {

  3193.                         GET_MVDATA(dmv_x, dmv_y);

  3194.                     }

  3195.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3196.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3197.                     intra_count += s->mb_intra;

  3198.                     is_intra[i] = s->mb_intra;

  3199.                     is_coded[i] = mb_has_coeffs;

  3200.                 }

  3201.                 if(i&4){

  3202.                     is_intra[i] = (intra_count >= 3);

  3203.                     is_coded[i] = val;

  3204.                 }

  3205.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3206.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3207.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3208.             }

  3209.             // if there are no coded blocks then don't do anything more

  3210.             if(!intra_count && !coded_inter) return 0;

  3211.             dst_idx = 0;

  3212.             GET_MQUANT();

  3213.             s->current_picture.qscale_table[mb_pos] = mquant;

  3214.             /* test if block is intra and has pred */

  3215.             {

  3216.                 int intrapred = 0;

  3217.                 for(i=0; i<6; i++)

  3218.                     if(is_intra[i]) {

  3219.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3220.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3221.                             intrapred = 1;

  3222.                             break;

  3223.                         }

  3224.                     }

  3225.                 if(intrapred)s->ac_pred = get_bits(gb, 1);

  3226.                 else s->ac_pred = 0;

  3227.             }

  3228.             if (!v->ttmbf && coded_inter)

  3229.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3230.             for (i=0; i<6; i++)

  3231.             {

  3232.                 dst_idx += i >> 2;

  3233.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3234.                 s->mb_intra = is_intra[i];

  3235.                 if (is_intra[i]) {

  3236.                     /* check if prediction blocks A and C are available */

  3237.                     v->a_avail = v->c_avail = 0;

  3238.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3239.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3240.                     if(i == 1 || i == 3 || s->mb_x)

  3241.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3242. 

  3243.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3244.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3245.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3246.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3247.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3248.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3249.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3250.                     if(v->pq >= 9 && v->overlap) {

  3251.                         if(v->c_avail)

  3252.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3253.                         if(v->a_avail)

  3254.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3255.                     }

  3256.                 } else if(is_coded[i]) {

  3257.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3258.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3259.                     first_block = 0;

  3260.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3261.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3262.                 }

  3263.             }

  3264.             return status;

  3265.         }

  3266.         else //Skipped MB

  3267.         {

  3268.             s->mb_intra = 0;

  3269.             s->current_picture.qscale_table[mb_pos] = 0;

  3270.             for (i=0; i<6; i++) {

  3271.                 v->mb_type[0][s->block_index[i]] = 0;

  3272.                 s->dc_val[0][s->block_index[i]] = 0;

  3273.             }

  3274.             for (i=0; i<4; i++)

  3275.             {

  3276.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3277.                 vc1_mc_4mv_luma(v, i);

  3278.             }

  3279.             vc1_mc_4mv_chroma(v);

  3280.             s->current_picture.qscale_table[mb_pos] = 0;

  3281.             return 0;

  3282.         }

  3283.     }

  3284. 

  3285.     /* Should never happen */

  3286.     return -1;

  3287. }

  3288. 

  3289. /** Decode one B-frame MB (in Main profile)

  3290.  */

  3291. static void vc1_decode_b_mb(VC1Context *v)

  3292. {

  3293.     MpegEncContext *s = &v->s;

  3294.     GetBitContext *gb = &s->gb;

  3295.     int i, j;

  3296.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3297.     int cbp = 0; /* cbp decoding stuff */

  3298.     int mqdiff, mquant; /* MB quantization */

  3299.     int ttmb = v->ttfrm; /* MB Transform type */

  3300. 

  3301.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3302.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3303.     int mb_has_coeffs = 0; /* last_flag */

  3304.     int index, index1; /* LUT indices */

  3305.     int val, sign; /* temp values */

  3306.     int first_block = 1;

  3307.     int dst_idx, off;

  3308.     int skipped, direct;

  3309.     int dmv_x[2], dmv_y[2];

  3310.     int bmvtype = BMV_TYPE_BACKWARD;

  3311. 

  3312.     mquant = v->pq; /* Loosy initialization */

  3313.     s->mb_intra = 0;

  3314. 

  3315.     if (v->dmb_is_raw)

  3316.         direct = get_bits1(gb);

  3317.     else

  3318.         direct = v->direct_mb_plane[mb_pos];

  3319.     if (v->skip_is_raw)

  3320.         skipped = get_bits1(gb);

  3321.     else

  3322.         skipped = v->s.mbskip_table[mb_pos];

  3323. 

  3324.     s->dsp.clear_blocks(s->block[0]);

  3325.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3326.     for(i = 0; i < 6; i++) {

  3327.         v->mb_type[0][s->block_index[i]] = 0;

  3328.         s->dc_val[0][s->block_index[i]] = 0;

  3329.     }

  3330.     s->current_picture.qscale_table[mb_pos] = 0;

  3331. 

  3332.     if (!direct) {

  3333.         if (!skipped) {

  3334.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3335.             dmv_x[1] = dmv_x[0];

  3336.             dmv_y[1] = dmv_y[0];

  3337.         }

  3338.         if(skipped || !s->mb_intra) {

  3339.             bmvtype = decode012(gb);

  3340.             switch(bmvtype) {

  3341.             case 0:

  3342.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3343.                 break;

  3344.             case 1:

  3345.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3346.                 break;

  3347.             case 2:

  3348.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3349.                 dmv_x[0] = dmv_y[0] = 0;

  3350.             }

  3351.         }

  3352.     }

  3353.     for(i = 0; i < 6; i++)

  3354.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3355. 

  3356.     if (skipped) {

  3357.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3358.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3359.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3360.         return;

  3361.     }

  3362.     if (direct) {

  3363.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3364.         GET_MQUANT();

  3365.         s->mb_intra = 0;

  3366.         mb_has_coeffs = 0;

  3367.         s->current_picture.qscale_table[mb_pos] = mquant;

  3368.         if(!v->ttmbf)

  3369.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3370.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3371.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3372.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3373.     } else {

  3374.         if(!mb_has_coeffs && !s->mb_intra) {

  3375.             /* no coded blocks - effectively skipped */

  3376.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3377.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3378.             return;

  3379.         }

  3380.         if(s->mb_intra && !mb_has_coeffs) {

  3381.             GET_MQUANT();

  3382.             s->current_picture.qscale_table[mb_pos] = mquant;

  3383.             s->ac_pred = get_bits1(gb);

  3384.             cbp = 0;

  3385.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3386.         } else {

  3387.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3388.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3389.                 if(!mb_has_coeffs) {

  3390.                     /* interpolated skipped block */

  3391.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3392.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3393.                     return;

  3394.                 }

  3395.             }

  3396.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3397.             if(!s->mb_intra) {

  3398.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3399.             }

  3400.             if(s->mb_intra)

  3401.                 s->ac_pred = get_bits1(gb);

  3402.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3403.             GET_MQUANT();

  3404.             s->current_picture.qscale_table[mb_pos] = mquant;

  3405.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3406.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3407.         }

  3408.     }

  3409.     dst_idx = 0;

  3410.     for (i=0; i<6; i++)

  3411.     {

  3412.         s->dc_val[0][s->block_index[i]] = 0;

  3413.         dst_idx += i >> 2;

  3414.         val = ((cbp >> (5 - i)) & 1);

  3415.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3416.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3417.         if(s->mb_intra) {

  3418.             /* check if prediction blocks A and C are available */

  3419.             v->a_avail = v->c_avail = 0;

  3420.             if(i == 2 || i == 3 || !s->first_slice_line)

  3421.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3422.             if(i == 1 || i == 3 || s->mb_x)

  3423.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3424. 

  3425.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3426.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3427.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3428.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3429.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3430.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3431.         } else if(val) {

  3432.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3433.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3434.             first_block = 0;

  3435.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3436.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3437.         }

  3438.     }

  3439. }

  3440. 

  3441. /** Decode blocks of I-frame

  3442.  */

  3443. static void vc1_decode_i_blocks(VC1Context *v)

  3444. {

  3445.     int k, j;

  3446.     MpegEncContext *s = &v->s;

  3447.     int cbp, val;

  3448.     uint8_t *coded_val;

  3449.     int mb_pos;

  3450. 

  3451.     /* select codingmode used for VLC tables selection */

  3452.     switch(v->y_ac_table_index){

  3453.     case 0:

  3454.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3455.         break;

  3456.     case 1:

  3457.         v->codingset = CS_HIGH_MOT_INTRA;

  3458.         break;

  3459.     case 2:

  3460.         v->codingset = CS_MID_RATE_INTRA;

  3461.         break;

  3462.     }

  3463. 

  3464.     switch(v->c_ac_table_index){

  3465.     case 0:

  3466.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3467.         break;

  3468.     case 1:

  3469.         v->codingset2 = CS_HIGH_MOT_INTER;

  3470.         break;

  3471.     case 2:

  3472.         v->codingset2 = CS_MID_RATE_INTER;

  3473.         break;

  3474.     }

  3475. 

  3476.     /* Set DC scale - y and c use the same */

  3477.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3478.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3479. 

  3480.     //do frame decode

  3481.     s->mb_x = s->mb_y = 0;

  3482.     s->mb_intra = 1;

  3483.     s->first_slice_line = 1;

  3484.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3485.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3486.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3487.             ff_init_block_index(s);

  3488.             ff_update_block_index(s);

  3489.             s->dsp.clear_blocks(s->block[0]);

  3490.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3491.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3492.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3493.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3494.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3495. 

  3496.             // do actual MB decoding and displaying

  3497.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3498.             v->s.ac_pred = get_bits(&v->s.gb, 1);

  3499. 

  3500.             for(k = 0; k < 6; k++) {

  3501.                 val = ((cbp >> (5 - k)) & 1);

  3502. 

  3503.                 if (k < 4) {

  3504.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3505.                     val = val ^ pred;

  3506.                     *coded_val = val;

  3507.                 }

  3508.                 cbp |= val << (5 - k);

  3509. 

  3510.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3511. 

  3512.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3513.                 if(!v->res_fasttx && !v->res_x8) for(j = 0; j < 64; j++) s->block[k][j] -= 16;

  3514.                 if(v->pq >= 9 && v->overlap) {

  3515.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3516.                 }

  3517.             }

  3518. 

  3519.             vc1_put_block(v, s->block);

  3520.             if(v->pq >= 9 && v->overlap) {

  3521.                 if(s->mb_x) {

  3522.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3523.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3524.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3525.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3526.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3527.                     }

  3528.                 }

  3529.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3530.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3531.                 if(!s->first_slice_line) {

  3532.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3533.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3534.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3535.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3536.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3537.                     }

  3538.                 }

  3539.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3540.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3541.             }

  3542. 

  3543.             if(get_bits_count(&s->gb) > v->bits) {

  3544.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3545.                 return;

  3546.             }

  3547.         }

  3548.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3549.         s->first_slice_line = 0;

  3550.     }

  3551. }

  3552. 

  3553. /** Decode blocks of I-frame for advanced profile

  3554.  */

  3555. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3556. {

  3557.     int k, j;

  3558.     MpegEncContext *s = &v->s;

  3559.     int cbp, val;

  3560.     uint8_t *coded_val;

  3561.     int mb_pos;

  3562.     int mquant = v->pq;

  3563.     int mqdiff;

  3564.     int overlap;

  3565.     GetBitContext *gb = &s->gb;

  3566. 

  3567.     /* select codingmode used for VLC tables selection */

  3568.     switch(v->y_ac_table_index){

  3569.     case 0:

  3570.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3571.         break;

  3572.     case 1:

  3573.         v->codingset = CS_HIGH_MOT_INTRA;

  3574.         break;

  3575.     case 2:

  3576.         v->codingset = CS_MID_RATE_INTRA;

  3577.         break;

  3578.     }

  3579. 

  3580.     switch(v->c_ac_table_index){

  3581.     case 0:

  3582.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3583.         break;

  3584.     case 1:

  3585.         v->codingset2 = CS_HIGH_MOT_INTER;

  3586.         break;

  3587.     case 2:

  3588.         v->codingset2 = CS_MID_RATE_INTER;

  3589.         break;

  3590.     }

  3591. 

  3592.     //do frame decode

  3593.     s->mb_x = s->mb_y = 0;

  3594.     s->mb_intra = 1;

  3595.     s->first_slice_line = 1;

  3596.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3597.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3598.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3599.             ff_init_block_index(s);

  3600.             ff_update_block_index(s);

  3601.             s->dsp.clear_blocks(s->block[0]);

  3602.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3603.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3604.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3605.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3606. 

  3607.             // do actual MB decoding and displaying

  3608.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3609.             if(v->acpred_is_raw)

  3610.                 v->s.ac_pred = get_bits(&v->s.gb, 1);

  3611.             else

  3612.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3613. 

  3614.             if(v->condover == CONDOVER_SELECT) {

  3615.                 if(v->overflg_is_raw)

  3616.                     overlap = get_bits(&v->s.gb, 1);

  3617.                 else

  3618.                     overlap = v->over_flags_plane[mb_pos];

  3619.             } else

  3620.                 overlap = (v->condover == CONDOVER_ALL);

  3621. 

  3622.             GET_MQUANT();

  3623. 

  3624.             s->current_picture.qscale_table[mb_pos] = mquant;

  3625.             /* Set DC scale - y and c use the same */

  3626.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3627.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3628. 

  3629.             for(k = 0; k < 6; k++) {

  3630.                 val = ((cbp >> (5 - k)) & 1);

  3631. 

  3632.                 if (k < 4) {

  3633.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3634.                     val = val ^ pred;

  3635.                     *coded_val = val;

  3636.                 }

  3637.                 cbp |= val << (5 - k);

  3638. 

  3639.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3640.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3641. 

  3642.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3643. 

  3644.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3645.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3646.             }

  3647. 

  3648.             vc1_put_block(v, s->block);

  3649.             if(overlap) {

  3650.                 if(s->mb_x) {

  3651.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3652.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3653.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3654.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3655.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3656.                     }

  3657.                 }

  3658.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3659.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3660.                 if(!s->first_slice_line) {

  3661.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3662.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3663.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3664.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3665.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3666.                     }

  3667.                 }

  3668.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3669.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3670.             }

  3671. 

  3672.             if(get_bits_count(&s->gb) > v->bits) {

  3673.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3674.                 return;

  3675.             }

  3676.         }

  3677.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3678.         s->first_slice_line = 0;

  3679.     }

  3680. }

  3681. 

  3682. static void vc1_decode_p_blocks(VC1Context *v)

  3683. {

  3684.     MpegEncContext *s = &v->s;

  3685. 

  3686.     /* select codingmode used for VLC tables selection */

  3687.     switch(v->c_ac_table_index){

  3688.     case 0:

  3689.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3690.         break;

  3691.     case 1:

  3692.         v->codingset = CS_HIGH_MOT_INTRA;

  3693.         break;

  3694.     case 2:

  3695.         v->codingset = CS_MID_RATE_INTRA;

  3696.         break;

  3697.     }

  3698. 

  3699.     switch(v->c_ac_table_index){

  3700.     case 0:

  3701.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3702.         break;

  3703.     case 1:

  3704.         v->codingset2 = CS_HIGH_MOT_INTER;

  3705.         break;

  3706.     case 2:

  3707.         v->codingset2 = CS_MID_RATE_INTER;

  3708.         break;

  3709.     }

  3710. 

  3711.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3712.     s->first_slice_line = 1;

  3713.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3714.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3715.             ff_init_block_index(s);

  3716.             ff_update_block_index(s);

  3717.             s->dsp.clear_blocks(s->block[0]);

  3718. 

  3719.             vc1_decode_p_mb(v);

  3720.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3721.                 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);

  3722.                 return;

  3723.             }

  3724.         }

  3725.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3726.         s->first_slice_line = 0;

  3727.     }

  3728. }

  3729. 

  3730. static void vc1_decode_b_blocks(VC1Context *v)

  3731. {

  3732.     MpegEncContext *s = &v->s;

  3733. 

  3734.     /* select codingmode used for VLC tables selection */

  3735.     switch(v->c_ac_table_index){

  3736.     case 0:

  3737.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3738.         break;

  3739.     case 1:

  3740.         v->codingset = CS_HIGH_MOT_INTRA;

  3741.         break;

  3742.     case 2:

  3743.         v->codingset = CS_MID_RATE_INTRA;

  3744.         break;

  3745.     }

  3746. 

  3747.     switch(v->c_ac_table_index){

  3748.     case 0:

  3749.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3750.         break;

  3751.     case 1:

  3752.         v->codingset2 = CS_HIGH_MOT_INTER;

  3753.         break;

  3754.     case 2:

  3755.         v->codingset2 = CS_MID_RATE_INTER;

  3756.         break;

  3757.     }

  3758. 

  3759.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3760.     s->first_slice_line = 1;

  3761.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3762.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3763.             ff_init_block_index(s);

  3764.             ff_update_block_index(s);

  3765.             s->dsp.clear_blocks(s->block[0]);

  3766. 

  3767.             vc1_decode_b_mb(v);

  3768.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3769.                 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);

  3770.                 return;

  3771.             }

  3772.         }

  3773.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3774.         s->first_slice_line = 0;

  3775.     }

  3776. }

  3777. 

  3778. static void vc1_decode_skip_blocks(VC1Context *v)

  3779. {

  3780.     MpegEncContext *s = &v->s;

  3781. 

  3782.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3783.     s->first_slice_line = 1;

  3784.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3785.         s->mb_x = 0;

  3786.         ff_init_block_index(s);

  3787.         ff_update_block_index(s);

  3788.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  3789.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3790.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3791.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3792.         s->first_slice_line = 0;

  3793.     }

  3794.     s->pict_type = P_TYPE;

  3795. }

  3796. 

  3797. static void vc1_decode_blocks(VC1Context *v)

  3798. {

  3799. 

  3800.     v->s.esc3_level_length = 0;

  3801. 

  3802.     switch(v->s.pict_type) {

  3803.     case I_TYPE:

  3804.         if(v->profile == PROFILE_ADVANCED)

  3805.             vc1_decode_i_blocks_adv(v);

  3806.         else

  3807.             vc1_decode_i_blocks(v);

  3808.         break;

  3809.     case P_TYPE:

  3810.         if(v->p_frame_skipped)

  3811.             vc1_decode_skip_blocks(v);

  3812.         else

  3813.             vc1_decode_p_blocks(v);

  3814.         break;

  3815.     case B_TYPE:

  3816.         if(v->bi_type){

  3817.             if(v->profile == PROFILE_ADVANCED)

  3818.                 vc1_decode_i_blocks_adv(v);

  3819.             else

  3820.                 vc1_decode_i_blocks(v);

  3821.         }else

  3822.             vc1_decode_b_blocks(v);

  3823.         break;

  3824.     }

  3825. }

  3826. 

  3827. /** Find VC-1 marker in buffer

  3828.  * @return position where next marker starts or end of buffer if no marker found

  3829.  */

  3830. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  3831. {

  3832.     uint32_t mrk = 0xFFFFFFFF;

  3833. 

  3834.     if(end-src < 4) return end;

  3835.     while(src < end){

  3836.         mrk = (mrk << 8) | *src++;

  3837.         if(IS_MARKER(mrk))

  3838.             return src-4;

  3839.     }

  3840.     return end;

  3841. }

  3842. 

  3843. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  3844. {

  3845.     int dsize = 0, i;

  3846. 

  3847.     if(size < 4){

  3848.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  3849.         return size;

  3850.     }

  3851.     for(i = 0; i < size; i++, src++) {

  3852.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  3853.             dst[dsize++] = src[1];

  3854.             src++;

  3855.             i++;

  3856.         } else

  3857.             dst[dsize++] = *src;

  3858.     }

  3859.     return dsize;

  3860. }

  3861. 

  3862. /** Initialize a VC1/WMV3 decoder

  3863.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3864.  * @todo TODO: Decypher remaining bits in extra_data

  3865.  */

  3866. static int vc1_decode_init(AVCodecContext *avctx)

  3867. {

  3868.     VC1Context *v = avctx->priv_data;

  3869.     MpegEncContext *s = &v->s;

  3870.     GetBitContext gb;

  3871. 

  3872.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3873.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3874.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3875.     else

  3876.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3877.     v->s.avctx = avctx;

  3878.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3879.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3880. 

  3881.     if(ff_h263_decode_init(avctx) < 0)

  3882.         return -1;

  3883.     if (vc1_init_common(v) < 0) return -1;

  3884. 

  3885.     avctx->coded_width = avctx->width;

  3886.     avctx->coded_height = avctx->height;

  3887.     if (avctx->codec_id == CODEC_ID_WMV3)

  3888.     {

  3889.         int count = 0;

  3890. 

  3891.         // looks like WMV3 has a sequence header stored in the extradata

  3892.         // advanced sequence header may be before the first frame

  3893.         // the last byte of the extradata is a version number, 1 for the

  3894.         // samples we can decode

  3895. 

  3896.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3897. 

  3898.         if (decode_sequence_header(avctx, &gb) < 0)

  3899.           return -1;

  3900. 

  3901.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3902.         if (count>0)

  3903.         {

  3904.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3905.                    count, get_bits(&gb, count));

  3906.         }

  3907.         else if (count < 0)

  3908.         {

  3909.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3910.         }

  3911.     } else { // VC1/WVC1

  3912.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  3913.         uint8_t *next; int size, buf2_size;

  3914.         uint8_t *buf2 = NULL;

  3915.         int seq_inited = 0, ep_inited = 0;

  3916. 

  3917.         if(avctx->extradata_size < 16) {

  3918.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  3919.             return -1;

  3920.         }

  3921. 

  3922.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3923.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  3924.         next = start;

  3925.         for(; next < end; start = next){

  3926.             next = find_next_marker(start + 4, end);

  3927.             size = next - start - 4;

  3928.             if(size <= 0) continue;

  3929.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  3930.             init_get_bits(&gb, buf2, buf2_size * 8);

  3931.             switch(AV_RB32(start)){

  3932.             case VC1_CODE_SEQHDR:

  3933.                 if(decode_sequence_header(avctx, &gb) < 0){

  3934.                     av_free(buf2);

  3935.                     return -1;

  3936.                 }

  3937.                 seq_inited = 1;

  3938.                 break;

  3939.             case VC1_CODE_ENTRYPOINT:

  3940.                 if(decode_entry_point(avctx, &gb) < 0){

  3941.                     av_free(buf2);

  3942.                     return -1;

  3943.                 }

  3944.                 ep_inited = 1;

  3945.                 break;

  3946.             }

  3947.         }

  3948.         av_free(buf2);

  3949.         if(!seq_inited || !ep_inited){

  3950.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  3951.             return -1;

  3952.         }

  3953.     }

  3954.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3955.     s->low_delay = !avctx->has_b_frames;

  3956. 

  3957.     s->mb_width = (avctx->coded_width+15)>>4;

  3958.     s->mb_height = (avctx->coded_height+15)>>4;

  3959. 

  3960.     /* Allocate mb bitplanes */

  3961.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3962.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3963.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  3964.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  3965. 

  3966.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3967.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3968.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3969.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3970.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3971. 

  3972.     /* Init coded blocks info */

  3973.     if (v->profile == PROFILE_ADVANCED)

  3974.     {

  3975. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3976. //            return -1;

  3977. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3978. //            return -1;

  3979.     }

  3980. 

  3981.     return 0;

  3982. }

  3983. 

  3984. 

  3985. /** Decode a VC1/WMV3 frame

  3986.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3987.  */

  3988. static int vc1_decode_frame(AVCodecContext *avctx,

  3989.                             void *data, int *data_size,

  3990.                             uint8_t *buf, int buf_size)

  3991. {

  3992.     VC1Context *v = avctx->priv_data;

  3993.     MpegEncContext *s = &v->s;

  3994.     AVFrame *pict = data;

  3995.     uint8_t *buf2 = NULL;

  3996. 

  3997.     /* no supplementary picture */

  3998.     if (buf_size == 0) {

  3999.         /* special case for last picture */

  4000.         if (s->low_delay==0 && s->next_picture_ptr) {

  4001.             *pict= *(AVFrame*)s->next_picture_ptr;

  4002.             s->next_picture_ptr= NULL;

  4003. 

  4004.             *data_size = sizeof(AVFrame);

  4005.         }

  4006. 

  4007.         return 0;

  4008.     }

  4009. 

  4010.     /* We need to set current_picture_ptr before reading the header,

  4011.      * otherwise we cannot store anything in there. */

  4012.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  4013.         int i= ff_find_unused_picture(s, 0);

  4014.         s->current_picture_ptr= &s->picture[i];

  4015.     }

  4016. 

  4017.     //for advanced profile we may need to parse and unescape data

  4018.     if (avctx->codec_id == CODEC_ID_VC1) {

  4019.         int buf_size2 = 0;

  4020.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  4021. 

  4022.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  4023.             uint8_t *start, *end, *next;

  4024.             int size;

  4025. 

  4026.             next = buf;

  4027.             for(start = buf, end = buf + buf_size; next < end; start = next){

  4028.                 next = find_next_marker(start + 4, end);

  4029.                 size = next - start - 4;

  4030.                 if(size <= 0) continue;

  4031.                 switch(AV_RB32(start)){

  4032.                 case VC1_CODE_FRAME:

  4033.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4034.                     break;

  4035.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4036.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4037.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4038.                     decode_entry_point(avctx, &s->gb);

  4039.                     break;

  4040.                 case VC1_CODE_SLICE:

  4041.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4042.                     av_free(buf2);

  4043.                     return -1;

  4044.                 }

  4045.             }

  4046.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4047.             uint8_t *divider;

  4048. 

  4049.             divider = find_next_marker(buf, buf + buf_size);

  4050.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4051.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4052.                 return -1;

  4053.             }

  4054. 

  4055.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4056.             // TODO

  4057.             av_free(buf2);return -1;

  4058.         }else{

  4059.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4060.         }

  4061.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4062.     } else

  4063.         init_get_bits(&s->gb, buf, buf_size*8);

  4064.     // do parse frame header

  4065.     if(v->profile < PROFILE_ADVANCED) {

  4066.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4067.             av_free(buf2);

  4068.             return -1;

  4069.         }

  4070.     } else {

  4071.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4072.             av_free(buf2);

  4073.             return -1;

  4074.         }

  4075.     }

  4076. 

  4077.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4078.         av_free(buf2);

  4079.         return -1;

  4080.     }

  4081. 

  4082.     // for hurry_up==5

  4083.     s->current_picture.pict_type= s->pict_type;

  4084.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4085. 

  4086.     /* skip B-frames if we don't have reference frames */

  4087.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4088.         av_free(buf2);

  4089.         return -1;//buf_size;

  4090.     }

  4091.     /* skip b frames if we are in a hurry */

  4092.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4093.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4094.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4095.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4096.         av_free(buf2);

  4097.         return buf_size;

  4098.     }

  4099.     /* skip everything if we are in a hurry>=5 */

  4100.     if(avctx->hurry_up>=5) {

  4101.         av_free(buf2);

  4102.         return -1;//buf_size;

  4103.     }

  4104. 

  4105.     if(s->next_p_frame_damaged){

  4106.         if(s->pict_type==B_TYPE)

  4107.             return buf_size;

  4108.         else

  4109.             s->next_p_frame_damaged=0;

  4110.     }

  4111. 

  4112.     if(MPV_frame_start(s, avctx) < 0) {

  4113.         av_free(buf2);

  4114.         return -1;

  4115.     }

  4116. 

  4117.     ff_er_frame_start(s);

  4118. 

  4119.     v->bits = buf_size * 8;

  4120.     vc1_decode_blocks(v);

  4121. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4122. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4123. //      return -1;

  4124.     ff_er_frame_end(s);

  4125. 

  4126.     MPV_frame_end(s);

  4127. 

  4128. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4129. assert(s->current_picture.pict_type == s->pict_type);

  4130.     if (s->pict_type == B_TYPE || s->low_delay) {

  4131.         *pict= *(AVFrame*)s->current_picture_ptr;

  4132.     } else if (s->last_picture_ptr != NULL) {

  4133.         *pict= *(AVFrame*)s->last_picture_ptr;

  4134.     }

  4135. 

  4136.     if(s->last_picture_ptr || s->low_delay){

  4137.         *data_size = sizeof(AVFrame);

  4138.         ff_print_debug_info(s, pict);

  4139.     }

  4140. 

  4141.     /* Return the Picture timestamp as the frame number */

  4142.     /* we substract 1 because it is added on utils.c    */

  4143.     avctx->frame_number = s->picture_number - 1;

  4144. 

  4145.     av_free(buf2);

  4146.     return buf_size;

  4147. }

  4148. 

  4149. 

  4150. /** Close a VC1/WMV3 decoder

  4151.  * @warning Initial try at using MpegEncContext stuff

  4152.  */

  4153. static int vc1_decode_end(AVCodecContext *avctx)

  4154. {

  4155.     VC1Context *v = avctx->priv_data;

  4156. 

  4157.     av_freep(&v->hrd_rate);

  4158.     av_freep(&v->hrd_buffer);

  4159.     MPV_common_end(&v->s);

  4160.     av_freep(&v->mv_type_mb_plane);

  4161.     av_freep(&v->direct_mb_plane);

  4162.     av_freep(&v->acpred_plane);

  4163.     av_freep(&v->over_flags_plane);

  4164.     av_freep(&v->mb_type_base);

  4165.     return 0;

  4166. }

  4167. 

  4168. 

  4169. AVCodec vc1_decoder = {

  4170.     "vc1",

  4171.     CODEC_TYPE_VIDEO,

  4172.     CODEC_ID_VC1,

  4173.     sizeof(VC1Context),

  4174.     vc1_decode_init,

  4175.     NULL,

  4176.     vc1_decode_end,

  4177.     vc1_decode_frame,

  4178.     CODEC_CAP_DELAY,

  4179.     NULL

  4180. };

  4181. 

  4182. AVCodec wmv3_decoder = {

  4183.     "wmv3",

  4184.     CODEC_TYPE_VIDEO,

  4185.     CODEC_ID_WMV3,

  4186.     sizeof(VC1Context),

  4187.     vc1_decode_init,

  4188.     NULL,

  4189.     vc1_decode_end,

  4190.     vc1_decode_frame,

  4191.     CODEC_CAP_DELAY,

  4192.     NULL

  4193. };