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FFmpeg/libavcodec/vc1.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

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

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

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file vc1.c

  25.  * VC-1 and WMV3 decoder

  26.  *

  27.  */

  28. #include "dsputil.h"

  29. #include "avcodec.h"

  30. #include "mpegvideo.h"

  31. #include "vc1.h"

  32. #include "vc1data.h"

  33. #include "vc1acdata.h"

  34. #include "msmpeg4data.h"

  35. #include "unary.h"

  36. #include "simple_idct.h"

  37. 

  38. #undef NDEBUG

  39. #include <assert.h>

  40. 

  41. #define MB_INTRA_VLC_BITS 9

  42. #define DC_VLC_BITS 9

  43. #define AC_VLC_BITS 9

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

  45. 

  46. 

  47. /**

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

  49.  * @param v The VC1Context to initialize

  50.  * @return Status

  51.  */

  52. static int vc1_init_common(VC1Context *v)

  53. {

  54.     static int done = 0;

  55.     int i = 0;

  56. 

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

  58. 

  59.     /* VLC tables */

  60.     if(!done)

  61.     {

  62.         done = 1;

  63.         init_vlc(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  64.                  ff_vc1_bfraction_bits, 1, 1,

  65.                  ff_vc1_bfraction_codes, 1, 1, 1);

  66.         init_vlc(&ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  67.                  ff_vc1_norm2_bits, 1, 1,

  68.                  ff_vc1_norm2_codes, 1, 1, 1);

  69.         init_vlc(&ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  70.                  ff_vc1_norm6_bits, 1, 1,

  71.                  ff_vc1_norm6_codes, 2, 2, 1);

  72.         init_vlc(&ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  73.                  ff_vc1_imode_bits, 1, 1,

  74.                  ff_vc1_imode_codes, 1, 1, 1);

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

  76.         {

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

  78.                      ff_vc1_ttmb_bits[i], 1, 1,

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

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

  81.                      ff_vc1_ttblk_bits[i], 1, 1,

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

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

  84.                      ff_vc1_subblkpat_bits[i], 1, 1,

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

  86.         }

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

  88.         {

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

  90.                      ff_vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  93.                      ff_vc1_cbpcy_p_bits[i], 1, 1,

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

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

  96.                      ff_vc1_mv_diff_bits[i], 1, 1,

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

  98.         }

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

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

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

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

  103.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  106.     }

  107. 

  108.     /* Other defaults */

  109.     v->pq = -1;

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

  111. 

  112.     return 0;

  113. }

  114. 

  115. /***********************************************************************/

  116. /**

  117.  * @defgroup bitplane VC9 Bitplane decoding

  118.  * @see 8.7, p56

  119.  * @{

  120.  */

  121. 

  122. /** @addtogroup bitplane

  123.  * Imode types

  124.  * @{

  125.  */

  126. enum Imode {

  127.     IMODE_RAW,

  128.     IMODE_NORM2,

  129.     IMODE_DIFF2,

  130.     IMODE_NORM6,

  131.     IMODE_DIFF6,

  132.     IMODE_ROWSKIP,

  133.     IMODE_COLSKIP

  134. };

  135. /** @} */ //imode defines

  136. 

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

  138.  * @param plane Buffer to store decoded bits

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

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

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

  142.  */

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

  144.     int x, y;

  145. 

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

  147.         if (!get_bits1(gb)) //rowskip

  148.             memset(plane, 0, width);

  149.         else

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

  151.                 plane[x] = get_bits1(gb);

  152.         plane += stride;

  153.     }

  154. }

  155. 

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

  157.  * @param plane Buffer to store decoded bits

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

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

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

  161.  * @todo FIXME: Optimize

  162.  */

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

  164.     int x, y;

  165. 

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

  167.         if (!get_bits1(gb)) //colskip

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

  169.                 plane[y*stride] = 0;

  170.         else

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

  172.                 plane[y*stride] = get_bits1(gb);

  173.         plane ++;

  174.     }

  175. }

  176. 

  177. /** Decode a bitplane's bits

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

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

  180.  * @return Status

  181.  * @todo FIXME: Optimize

  182.  */

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

  184. {

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

  186. 

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

  188.     uint8_t invert, *planep = data;

  189.     int width, height, stride;

  190. 

  191.     width = v->s.mb_width;

  192.     height = v->s.mb_height;

  193.     stride = v->s.mb_stride;

  194.     invert = get_bits1(gb);

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

  196. 

  197.     *raw_flag = 0;

  198.     switch (imode)

  199.     {

  200.     case IMODE_RAW:

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

  202.         *raw_flag = 1; //invert ignored

  203.         return invert;

  204.     case IMODE_DIFF2:

  205.     case IMODE_NORM2:

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

  207.         {

  208.             *planep++ = get_bits1(gb);

  209.             offset = 1;

  210.         }

  211.         else offset = 0;

  212.         // decode bitplane as one long line

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

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

  215.             *planep++ = code & 1;

  216.             offset++;

  217.             if(offset == width) {

  218.                 offset = 0;

  219.                 planep += stride - width;

  220.             }

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

  222.             offset++;

  223.             if(offset == width) {

  224.                 offset = 0;

  225.                 planep += stride - width;

  226.             }

  227.         }

  228.         break;

  229.     case IMODE_DIFF6:

  230.     case IMODE_NORM6:

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

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

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

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

  235.                     if(code < 0){

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

  237.                         return -1;

  238.                     }

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

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

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

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

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

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

  245.                 }

  246.                 planep += stride * 3;

  247.             }

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

  249.         } else { // 3x2

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

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

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

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

  254.                     if(code < 0){

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

  256.                         return -1;

  257.                     }

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

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

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

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

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

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

  264.                 }

  265.                 planep += stride * 2;

  266.             }

  267.             x = width % 3;

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

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

  270.         }

  271.         break;

  272.     case IMODE_ROWSKIP:

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

  274.         break;

  275.     case IMODE_COLSKIP:

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

  277.         break;

  278.     default: break;

  279.     }

  280. 

  281.     /* Applying diff operator */

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

  283.     {

  284.         planep = data;

  285.         planep[0] ^= invert;

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

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

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

  289.         {

  290.             planep += stride;

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

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

  293.             {

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

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

  296.             }

  297.         }

  298.     }

  299.     else if (invert)

  300.     {

  301.         planep = data;

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

  303.     }

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

  305. }

  306. 

  307. /** @} */ //Bitplane group

  308. 

  309. /***********************************************************************/

  310. /** VOP Dquant decoding

  311.  * @param v VC-1 Context

  312.  */

  313. static int vop_dquant_decoding(VC1Context *v)

  314. {

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

  316.     int pqdiff;

  317. 

  318.     //variable size

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

  320.     {

  321.         pqdiff = get_bits(gb, 3);

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

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

  324.     }

  325.     else

  326.     {

  327.         v->dquantfrm = get_bits1(gb);

  328.         if ( v->dquantfrm )

  329.         {

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

  331.             switch (v->dqprofile)

  332.             {

  333.             case DQPROFILE_SINGLE_EDGE:

  334.             case DQPROFILE_DOUBLE_EDGES:

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

  336.                 break;

  337.             case DQPROFILE_ALL_MBS:

  338.                 v->dqbilevel = get_bits1(gb);

  339.                 if(!v->dqbilevel)

  340.                     v->halfpq = 0;

  341.             default: break; //Forbidden ?

  342.             }

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

  344.             {

  345.                 pqdiff = get_bits(gb, 3);

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

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

  348.             }

  349.         }

  350.     }

  351.     return 0;

  352. }

  353. 

  354. /** Put block onto picture

  355.  */

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

  357. {

  358.     uint8_t *Y;

  359.     int ys, us, vs;

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

  361. 

  362.     if(v->rangeredfrm) {

  363.         int i, j, k;

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

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

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

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

  368. 

  369.     }

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

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

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

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

  374. 

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

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

  377.     Y += ys * 8;

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

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

  380. 

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

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

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

  384.     }

  385. }

  386. 

  387. /** Do motion compensation over 1 macroblock

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

  389.  */

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

  391. {

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

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

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

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

  396. 

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

  398. 

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

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

  401. 

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

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

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

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

  406.     }

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

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

  409.     if(v->fastuvmc) {

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

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

  412.     }

  413.     if(!dir) {

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

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

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

  417.     } else {

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

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

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

  421.     }

  422. 

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

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

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

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

  427. 

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

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

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

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

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

  433.     }else{

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

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

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

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

  438.     }

  439. 

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

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

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

  443. 

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

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

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

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

  448.     }

  449. 

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

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

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

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

  454. 

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

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

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

  458.         srcY = s->edge_emu_buffer;

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

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

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

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

  463.         srcU = uvbuf;

  464.         srcV = uvbuf + 16;

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

  466.         if(v->rangeredfrm) {

  467.             int i, j;

  468.             uint8_t *src, *src2;

  469. 

  470.             src = srcY;

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

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

  473.                 src += s->linesize;

  474.             }

  475.             src = srcU; src2 = srcV;

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

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

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

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

  480.                 }

  481.                 src += s->uvlinesize;

  482.                 src2 += s->uvlinesize;

  483.             }

  484.         }

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

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

  487.             int i, j;

  488.             uint8_t *src, *src2;

  489. 

  490.             src = srcY;

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

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

  493.                 src += s->linesize;

  494.             }

  495.             src = srcU; src2 = srcV;

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

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

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

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

  500.                 }

  501.                 src += s->uvlinesize;

  502.                 src2 += s->uvlinesize;

  503.             }

  504.         }

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

  506.     }

  507. 

  508.     if(s->mspel) {

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

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

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

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

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

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

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

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

  517. 

  518.         if(!v->rnd)

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

  520.         else

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

  522.     }

  523. 

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

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

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

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

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

  529.     if(!v->rnd){

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

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

  532.     }else{

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

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

  535.     }

  536. }

  537. 

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

  539.  */

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

  541. {

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

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

  544.     uint8_t *srcY;

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

  546.     int off;

  547. 

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

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

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

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

  552. 

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

  554. 

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

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

  557. 

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

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

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

  561.     }else{

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

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

  564.     }

  565. 

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

  567. 

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

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

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

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

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

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

  574.         srcY = s->edge_emu_buffer;

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

  576.         if(v->rangeredfrm) {

  577.             int i, j;

  578.             uint8_t *src;

  579. 

  580.             src = srcY;

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

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

  583.                 src += s->linesize;

  584.             }

  585.         }

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

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

  588.             int i, j;

  589.             uint8_t *src;

  590. 

  591.             src = srcY;

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

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

  594.                 src += s->linesize;

  595.             }

  596.         }

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

  598.     }

  599. 

  600.     if(s->mspel) {

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

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

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

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

  605.         if(!v->rnd)

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

  607.         else

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

  609.     }

  610. }

  611. 

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

  613. {

  614.     if(a < b) {

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

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

  617.     } else {

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

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

  620.     }

  621. }

  622. 

  623. 

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

  625.  */

  626. static void vc1_mc_4mv_chroma(VC1Context *v)

  627. {

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

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

  630.     uint8_t *srcU, *srcV;

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

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

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

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

  635. 

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

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

  638. 

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

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

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

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

  643.     }

  644. 

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

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

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

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

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

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

  651.         switch(idx) {

  652.         case 0x1:

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

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

  655.             break;

  656.         case 0x2:

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

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

  659.             break;

  660.         case 0x4:

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

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

  663.             break;

  664.         case 0x8:

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

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

  667.             break;

  668.         }

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

  670.         int t1 = 0, t2 = 0;

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

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

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

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

  675.     } else {

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

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

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

  679.     }

  680. 

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

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

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

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

  685.     if(v->fastuvmc) {

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

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

  688.     }

  689. 

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

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

  692. 

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

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

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

  696.     }else{

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

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

  699.     }

  700. 

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

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

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

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

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

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

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

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

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

  710.         srcU = s->edge_emu_buffer;

  711.         srcV = s->edge_emu_buffer + 16;

  712. 

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

  714.         if(v->rangeredfrm) {

  715.             int i, j;

  716.             uint8_t *src, *src2;

  717. 

  718.             src = srcU; src2 = srcV;

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

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

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

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

  723.                 }

  724.                 src += s->uvlinesize;

  725.                 src2 += s->uvlinesize;

  726.             }

  727.         }

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

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

  730.             int i, j;

  731.             uint8_t *src, *src2;

  732. 

  733.             src = srcU; src2 = srcV;

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

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

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

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

  738.                 }

  739.                 src += s->uvlinesize;

  740.                 src2 += s->uvlinesize;

  741.             }

  742.         }

  743.     }

  744. 

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

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

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

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

  749.     if(!v->rnd){

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

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

  752.     }else{

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

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

  755.     }

  756. }

  757. 

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

  759. 

  760. /**

  761.  * Decode Simple/Main Profiles sequence header

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

  763.  * @param avctx Codec context

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

  765.  * @return Status

  766.  */

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

  768. {

  769.     VC1Context *v = avctx->priv_data;

  770. 

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

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

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

  774.     {

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

  776.     }

  777. 

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

  779.     {

  780.         v->zz_8x4 = ff_vc1_adv_progressive_8x4_zz;

  781.         v->zz_4x8 = ff_vc1_adv_progressive_4x8_zz;

  782.         return decode_sequence_header_adv(v, gb);

  783.     }

  784.     else

  785.     {

  786.         v->zz_8x4 = ff_vc1_simple_progressive_8x4_zz;

  787.         v->zz_4x8 = ff_vc1_simple_progressive_4x8_zz;

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

  789.         if (v->res_sm)

  790.         {

  791.             av_log(avctx, AV_LOG_ERROR,

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

  793.             return -1;

  794.         }

  795.     }

  796. 

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

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

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

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

  801.     v->s.loop_filter = get_bits1(gb); //common

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

  803.     {

  804.         av_log(avctx, AV_LOG_ERROR,

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

  806.     }

  807. 

  808.     v->res_x8 = get_bits1(gb); //reserved

  809.     v->multires = get_bits1(gb);

  810.     v->res_fasttx = get_bits1(gb);

  811.     if (!v->res_fasttx)

  812.     {

  813.         v->s.dsp.vc1_inv_trans_8x8 = ff_simple_idct;

  814.         v->s.dsp.vc1_inv_trans_8x4 = ff_simple_idct84_add;

  815.         v->s.dsp.vc1_inv_trans_4x8 = ff_simple_idct48_add;

  816.         v->s.dsp.vc1_inv_trans_4x4 = ff_simple_idct44_add;

  817.     }

  818. 

  819.     v->fastuvmc =  get_bits1(gb); //common

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

  821.     {

  822.         av_log(avctx, AV_LOG_ERROR,

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

  824.         return -1;

  825.     }

  826.     v->extended_mv =  get_bits1(gb); //common

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

  828.     {

  829.         av_log(avctx, AV_LOG_ERROR,

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

  831.         return -1;

  832.     }

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

  834.     v->vstransform =  get_bits1(gb); //common

  835. 

  836.     v->res_transtab = get_bits1(gb);

  837.     if (v->res_transtab)

  838.     {

  839.         av_log(avctx, AV_LOG_ERROR,

  840.                "1 for reserved RES_TRANSTAB is forbidden\n");

  841.         return -1;

  842.     }

  843. 

  844.     v->overlap = get_bits1(gb); //common

  845. 

  846.     v->s.resync_marker = get_bits1(gb);

  847.     v->rangered = get_bits1(gb);

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

  849.     {

  850.         av_log(avctx, AV_LOG_INFO,

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

  852.     }

  853. 

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

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

  856. 

  857.     v->finterpflag = get_bits1(gb); //common

  858.     v->res_rtm_flag = get_bits1(gb); //reserved

  859.     if (!v->res_rtm_flag)

  860.     {

  861. //            av_log(avctx, AV_LOG_ERROR,

  862. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  863.         av_log(avctx, AV_LOG_ERROR,

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

  865.         //return -1;

  866.     }

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

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

  869.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  878.                );

  879.     return 0;

  880. }

  881. 

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

  883. {

  884.     v->res_rtm_flag = 1;

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

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

  887.     {

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

  889.     }

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

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

  892.     {

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

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

  895.         return -1;

  896.     }

  897. 

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

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

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

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

  902.     v->postprocflag = get_bits1(gb); //common

  903. 

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

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

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

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

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

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

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

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

  912.     skip_bits1(gb); // reserved

  913. 

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

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

  916. 

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

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

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

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

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

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

  923.                v->tfcntrflag, v->finterpflag

  924.                );

  925. 

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

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

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

  929.         return -1;

  930.     }

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

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

  933.         int w, h, ar = 0;

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

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

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

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

  938.         if(get_bits1(gb))

  939.             ar = get_bits(gb, 4);

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

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

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

  943.             w = get_bits(gb, 8);

  944.             h = get_bits(gb, 8);

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

  946.         }

  947. 

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

  949.             if(get_bits1(gb)) {

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

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

  952.             } else {

  953.                 int nr, dr;

  954.                 nr = get_bits(gb, 8);

  955.                 dr = get_bits(gb, 4);

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

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

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

  959.                 }

  960.             }

  961.         }

  962. 

  963.         if(get_bits1(gb)){

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

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

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

  967.         }

  968.     }

  969. 

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

  971.     if(v->hrd_param_flag) {

  972.         int i;

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

  974.         skip_bits(gb, 4); //bitrate exponent

  975.         skip_bits(gb, 4); //buffer size exponent

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

  977.             skip_bits(gb, 16); //hrd_rate[n]

  978.             skip_bits(gb, 16); //hrd_buffer[n]

  979.         }

  980.     }

  981.     return 0;

  982. }

  983. 

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

  985. {

  986.     VC1Context *v = avctx->priv_data;

  987.     int i, blink, clentry, refdist;

  988. 

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

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

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

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

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

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

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

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

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

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

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

  1000.     v->quantizer_mode = get_bits(gb, 2);

  1001. 

  1002.     if(v->hrd_param_flag){

  1003.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1004.             skip_bits(gb, 8); //hrd_full[n]

  1005.         }

  1006.     }

  1007. 

  1008.     if(get_bits1(gb)){

  1009.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

  1010.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1011.     }

  1012.     if(v->extended_mv)

  1013.         v->extended_dmv = get_bits1(gb);

  1014.     if(get_bits1(gb)) {

  1015.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1016.         skip_bits(gb, 3); // Y range, ignored for now

  1017.     }

  1018.     if(get_bits1(gb)) {

  1019.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1020.         skip_bits(gb, 3); // UV range, ignored for now

  1021.     }

  1022. 

  1023.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1024.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1025.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1026.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1027.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1028.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1029. 

  1030.     return 0;

  1031. }

  1032. 

  1033. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1034. {

  1035.     int pqindex, lowquant, status;

  1036. 

  1037.     if(v->finterpflag) v->interpfrm = get_bits1(gb);

  1038.     skip_bits(gb, 2); //framecnt unused

  1039.     v->rangeredfrm = 0;

  1040.     if (v->rangered) v->rangeredfrm = get_bits1(gb);

  1041.     v->s.pict_type = get_bits1(gb);

  1042.     if (v->s.avctx->max_b_frames) {

  1043.         if (!v->s.pict_type) {

  1044.             if (get_bits1(gb)) v->s.pict_type = I_TYPE;

  1045.             else v->s.pict_type = B_TYPE;

  1046.         } else v->s.pict_type = P_TYPE;

  1047.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1048. 

  1049.     v->bi_type = 0;

  1050.     if(v->s.pict_type == B_TYPE) {

  1051.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1052.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1053.         if(v->bfraction == 0) {

  1054.             v->s.pict_type = BI_TYPE;

  1055.         }

  1056.     }

  1057.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1058.         skip_bits(gb, 7); // skip buffer fullness

  1059. 

  1060.     /* calculate RND */

  1061.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1062.         v->rnd = 1;

  1063.     if(v->s.pict_type == P_TYPE)

  1064.         v->rnd ^= 1;

  1065. 

  1066.     /* Quantizer stuff */

  1067.     pqindex = get_bits(gb, 5);

  1068.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1069.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1070.     else

  1071.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1072. 

  1073.     v->pquantizer = 1;

  1074.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1075.         v->pquantizer = pqindex < 9;

  1076.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1077.         v->pquantizer = 0;

  1078.     v->pqindex = pqindex;

  1079.     if (pqindex < 9) v->halfpq = get_bits1(gb);

  1080.     else v->halfpq = 0;

  1081.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1082.         v->pquantizer = get_bits1(gb);

  1083.     v->dquantfrm = 0;

  1084.     if (v->extended_mv == 1) v->mvrange = get_unary(gb, 0, 3);

  1085.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1086.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1087.     v->range_x = 1 << (v->k_x - 1);

  1088.     v->range_y = 1 << (v->k_y - 1);

  1089.     if (v->profile == PROFILE_ADVANCED)

  1090.     {

  1091.         if (v->postprocflag) v->postproc = get_bits1(gb);

  1092.     }

  1093.     else

  1094.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1095. 

  1096.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1097.         v->x8_type = get_bits1(gb);

  1098.     }else v->x8_type = 0;

  1099. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1100. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1101. 

  1102.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1103. 

  1104.     switch(v->s.pict_type) {

  1105.     case P_TYPE:

  1106.         if (v->pq < 5) v->tt_index = 0;

  1107.         else if(v->pq < 13) v->tt_index = 1;

  1108.         else v->tt_index = 2;

  1109. 

  1110.         lowquant = (v->pq > 12) ? 0 : 1;

  1111.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];

  1112.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1113.         {

  1114.             int scale, shift, i;

  1115.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];

  1116.             v->lumscale = get_bits(gb, 6);

  1117.             v->lumshift = get_bits(gb, 6);

  1118.             v->use_ic = 1;

  1119.             /* fill lookup tables for intensity compensation */

  1120.             if(!v->lumscale) {

  1121.                 scale = -64;

  1122.                 shift = (255 - v->lumshift * 2) << 6;

  1123.                 if(v->lumshift > 31)

  1124.                     shift += 128 << 6;

  1125.             } else {

  1126.                 scale = v->lumscale + 32;

  1127.                 if(v->lumshift > 31)

  1128.                     shift = (v->lumshift - 64) << 6;

  1129.                 else

  1130.                     shift = v->lumshift << 6;

  1131.             }

  1132.             for(i = 0; i < 256; i++) {

  1133.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1134.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1135.             }

  1136.         }

  1137.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1138.             v->s.quarter_sample = 0;

  1139.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1140.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1141.                 v->s.quarter_sample = 0;

  1142.             else

  1143.                 v->s.quarter_sample = 1;

  1144.         } else

  1145.             v->s.quarter_sample = 1;

  1146.         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));

  1147. 

  1148.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1149.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1150.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1151.         {

  1152.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1153.             if (status < 0) return -1;

  1154.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1155.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1156.         } else {

  1157.             v->mv_type_is_raw = 0;

  1158.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1159.         }

  1160.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1161.         if (status < 0) return -1;

  1162.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1163.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1164. 

  1165.         /* Hopefully this is correct for P frames */

  1166.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1167.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1168. 

  1169.         if (v->dquant)

  1170.         {

  1171.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1172.             vop_dquant_decoding(v);

  1173.         }

  1174. 

  1175.         v->ttfrm = 0; //FIXME Is that so ?

  1176.         if (v->vstransform)

  1177.         {

  1178.             v->ttmbf = get_bits1(gb);

  1179.             if (v->ttmbf)

  1180.             {

  1181.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1182.             }

  1183.         } else {

  1184.             v->ttmbf = 1;

  1185.             v->ttfrm = TT_8X8;

  1186.         }

  1187.         break;

  1188.     case B_TYPE:

  1189.         if (v->pq < 5) v->tt_index = 0;

  1190.         else if(v->pq < 13) v->tt_index = 1;

  1191.         else v->tt_index = 2;

  1192. 

  1193.         lowquant = (v->pq > 12) ? 0 : 1;

  1194.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1195.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1196.         v->s.mspel = v->s.quarter_sample;

  1197. 

  1198.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1199.         if (status < 0) return -1;

  1200.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1201.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1202.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

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

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

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

  1206. 

  1207.         v->s.mv_table_index = get_bits(gb, 2);

  1208.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1209. 

  1210.         if (v->dquant)

  1211.         {

  1212.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1213.             vop_dquant_decoding(v);

  1214.         }

  1215. 

  1216.         v->ttfrm = 0;

  1217.         if (v->vstransform)

  1218.         {

  1219.             v->ttmbf = get_bits1(gb);

  1220.             if (v->ttmbf)

  1221.             {

  1222.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1223.             }

  1224.         } else {

  1225.             v->ttmbf = 1;

  1226.             v->ttfrm = TT_8X8;

  1227.         }

  1228.         break;

  1229.     }

  1230. 

  1231.     if(!v->x8_type)

  1232.     {

  1233.         /* AC Syntax */

  1234.         v->c_ac_table_index = decode012(gb);

  1235.         if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1236.         {

  1237.             v->y_ac_table_index = decode012(gb);

  1238.         }

  1239.         /* DC Syntax */

  1240.         v->s.dc_table_index = get_bits1(gb);

  1241.     }

  1242. 

  1243.     if(v->s.pict_type == BI_TYPE) {

  1244.         v->s.pict_type = B_TYPE;

  1245.         v->bi_type = 1;

  1246.     }

  1247.     return 0;

  1248. }

  1249. 

  1250. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1251. {

  1252.     int pqindex, lowquant;

  1253.     int status;

  1254. 

  1255.     v->p_frame_skipped = 0;

  1256. 

  1257.     if(v->interlace){

  1258.         v->fcm = decode012(gb);

  1259.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1260.     }

  1261.     switch(get_unary(gb, 0, 4)) {

  1262.     case 0:

  1263.         v->s.pict_type = P_TYPE;

  1264.         break;

  1265.     case 1:

  1266.         v->s.pict_type = B_TYPE;

  1267.         break;

  1268.     case 2:

  1269.         v->s.pict_type = I_TYPE;

  1270.         break;

  1271.     case 3:

  1272.         v->s.pict_type = BI_TYPE;

  1273.         break;

  1274.     case 4:

  1275.         v->s.pict_type = P_TYPE; // skipped pic

  1276.         v->p_frame_skipped = 1;

  1277.         return 0;

  1278.     }

  1279.     if(v->tfcntrflag)

  1280.         skip_bits(gb, 8);

  1281.     if(v->broadcast) {

  1282.         if(!v->interlace || v->psf) {

  1283.             v->rptfrm = get_bits(gb, 2);

  1284.         } else {

  1285.             v->tff = get_bits1(gb);

  1286.             v->rptfrm = get_bits1(gb);

  1287.         }

  1288.     }

  1289.     if(v->panscanflag) {

  1290.         //...

  1291.     }

  1292.     v->rnd = get_bits1(gb);

  1293.     if(v->interlace)

  1294.         v->uvsamp = get_bits1(gb);

  1295.     if(v->finterpflag) v->interpfrm = get_bits1(gb);

  1296.     if(v->s.pict_type == B_TYPE) {

  1297.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1298.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1299.         if(v->bfraction == 0) {

  1300.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1301.         }

  1302.     }

  1303.     pqindex = get_bits(gb, 5);

  1304.     v->pqindex = pqindex;

  1305.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1306.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1307.     else

  1308.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1309. 

  1310.     v->pquantizer = 1;

  1311.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1312.         v->pquantizer = pqindex < 9;

  1313.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1314.         v->pquantizer = 0;

  1315.     v->pqindex = pqindex;

  1316.     if (pqindex < 9) v->halfpq = get_bits1(gb);

  1317.     else v->halfpq = 0;

  1318.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1319.         v->pquantizer = get_bits1(gb);

  1320. 

  1321.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1322. 

  1323.     switch(v->s.pict_type) {

  1324.     case I_TYPE:

  1325.     case BI_TYPE:

  1326.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1327.         if (status < 0) return -1;

  1328.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1329.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1330.         v->condover = CONDOVER_NONE;

  1331.         if(v->overlap && v->pq <= 8) {

  1332.             v->condover = decode012(gb);

  1333.             if(v->condover == CONDOVER_SELECT) {

  1334.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1335.                 if (status < 0) return -1;

  1336.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1337.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1338.             }

  1339.         }

  1340.         break;

  1341.     case P_TYPE:

  1342.         if(v->postprocflag)

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

  1344.         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);

  1345.         else v->mvrange = 0;

  1346.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1347.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1348.         v->range_x = 1 << (v->k_x - 1);

  1349.         v->range_y = 1 << (v->k_y - 1);

  1350. 

  1351.         if (v->pq < 5) v->tt_index = 0;

  1352.         else if(v->pq < 13) v->tt_index = 1;

  1353.         else v->tt_index = 2;

  1354. 

  1355.         lowquant = (v->pq > 12) ? 0 : 1;

  1356.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];

  1357.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1358.         {

  1359.             int scale, shift, i;

  1360.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];

  1361.             v->lumscale = get_bits(gb, 6);

  1362.             v->lumshift = get_bits(gb, 6);

  1363.             /* fill lookup tables for intensity compensation */

  1364.             if(!v->lumscale) {

  1365.                 scale = -64;

  1366.                 shift = (255 - v->lumshift * 2) << 6;

  1367.                 if(v->lumshift > 31)

  1368.                     shift += 128 << 6;

  1369.             } else {

  1370.                 scale = v->lumscale + 32;

  1371.                 if(v->lumshift > 31)

  1372.                     shift = (v->lumshift - 64) << 6;

  1373.                 else

  1374.                     shift = v->lumshift << 6;

  1375.             }

  1376.             for(i = 0; i < 256; i++) {

  1377.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1378.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1379.             }

  1380.             v->use_ic = 1;

  1381.         }

  1382.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1383.             v->s.quarter_sample = 0;

  1384.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1385.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1386.                 v->s.quarter_sample = 0;

  1387.             else

  1388.                 v->s.quarter_sample = 1;

  1389.         } else

  1390.             v->s.quarter_sample = 1;

  1391.         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));

  1392. 

  1393.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1394.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1395.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1396.         {

  1397.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1398.             if (status < 0) return -1;

  1399.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1400.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1401.         } else {

  1402.             v->mv_type_is_raw = 0;

  1403.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1404.         }

  1405.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1406.         if (status < 0) return -1;

  1407.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1408.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1409. 

  1410.         /* Hopefully this is correct for P frames */

  1411.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1412.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1413.         if (v->dquant)

  1414.         {

  1415.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1416.             vop_dquant_decoding(v);

  1417.         }

  1418. 

  1419.         v->ttfrm = 0; //FIXME Is that so ?

  1420.         if (v->vstransform)

  1421.         {

  1422.             v->ttmbf = get_bits1(gb);

  1423.             if (v->ttmbf)

  1424.             {

  1425.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1426.             }

  1427.         } else {

  1428.             v->ttmbf = 1;

  1429.             v->ttfrm = TT_8X8;

  1430.         }

  1431.         break;

  1432.     case B_TYPE:

  1433.         if(v->postprocflag)

  1434.             v->postproc = get_bits1(gb);

  1435.         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);

  1436.         else v->mvrange = 0;

  1437.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1438.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1439.         v->range_x = 1 << (v->k_x - 1);

  1440.         v->range_y = 1 << (v->k_y - 1);

  1441. 

  1442.         if (v->pq < 5) v->tt_index = 0;

  1443.         else if(v->pq < 13) v->tt_index = 1;

  1444.         else v->tt_index = 2;

  1445. 

  1446.         lowquant = (v->pq > 12) ? 0 : 1;

  1447.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1448.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1449.         v->s.mspel = v->s.quarter_sample;

  1450. 

  1451.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

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

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

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

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

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

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

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

  1459. 

  1460.         v->s.mv_table_index = get_bits(gb, 2);

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

  1462. 

  1463.         if (v->dquant)

  1464.         {

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

  1466.             vop_dquant_decoding(v);

  1467.         }

  1468. 

  1469.         v->ttfrm = 0;

  1470.         if (v->vstransform)

  1471.         {

  1472.             v->ttmbf = get_bits1(gb);

  1473.             if (v->ttmbf)

  1474.             {

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

  1476.             }

  1477.         } else {

  1478.             v->ttmbf = 1;

  1479.             v->ttfrm = TT_8X8;

  1480.         }

  1481.         break;

  1482.     }

  1483. 

  1484.     /* AC Syntax */

  1485.     v->c_ac_table_index = decode012(gb);

  1486.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1487.     {

  1488.         v->y_ac_table_index = decode012(gb);

  1489.     }

  1490.     /* DC Syntax */

  1491.     v->s.dc_table_index = get_bits1(gb);

  1492.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1493.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1494.         vop_dquant_decoding(v);

  1495.     }

  1496. 

  1497.     v->bi_type = 0;

  1498.     if(v->s.pict_type == BI_TYPE) {

  1499.         v->s.pict_type = B_TYPE;

  1500.         v->bi_type = 1;

  1501.     }

  1502.     return 0;

  1503. }

  1504. 

  1505. /***********************************************************************/

  1506. /**

  1507.  * @defgroup block VC-1 Block-level functions

  1508.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1509.  * @{

  1510.  */

  1511. 

  1512. /**

  1513.  * @def GET_MQUANT

  1514.  * @brief Get macroblock-level quantizer scale

  1515.  */

  1516. #define GET_MQUANT()                                           \

  1517.   if (v->dquantfrm)                                            \

  1518.   {                                                            \

  1519.     int edges = 0;                                             \

  1520.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1521.     {                                                          \

  1522.       if (v->dqbilevel)                                        \

  1523.       {                                                        \

  1524.         mquant = (get_bits1(gb)) ? v->altpq : v->pq;           \

  1525.       }                                                        \

  1526.       else                                                     \

  1527.       {                                                        \

  1528.         mqdiff = get_bits(gb, 3);                              \

  1529.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1530.         else mquant = get_bits(gb, 5);                         \

  1531.       }                                                        \

  1532.     }                                                          \

  1533.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1534.         edges = 1 << v->dqsbedge;                              \

  1535.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1536.         edges = (3 << v->dqsbedge) % 15;                       \

  1537.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1538.         edges = 15;                                            \

  1539.     if((edges&1) && !s->mb_x)                                  \

  1540.         mquant = v->altpq;                                     \

  1541.     if((edges&2) && s->first_slice_line)                       \

  1542.         mquant = v->altpq;                                     \

  1543.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1544.         mquant = v->altpq;                                     \

  1545.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1546.         mquant = v->altpq;                                     \

  1547.   }

  1548. 

  1549. /**

  1550.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1551.  * @brief Get MV differentials

  1552.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1553.  * @param _dmv_x Horizontal differential for decoded MV

  1554.  * @param _dmv_y Vertical differential for decoded MV

  1555.  */

  1556. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1557.   index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table,\

  1558.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1559.   if (index > 36)                                                   \

  1560.   {                                                                 \

  1561.     mb_has_coeffs = 1;                                              \

  1562.     index -= 37;                                                    \

  1563.   }                                                                 \

  1564.   else mb_has_coeffs = 0;                                           \

  1565.   s->mb_intra = 0;                                                  \

  1566.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1567.   else if (index == 35)                                             \

  1568.   {                                                                 \

  1569.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1570.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1571.   }                                                                 \

  1572.   else if (index == 36)                                             \

  1573.   {                                                                 \

  1574.     _dmv_x = 0;                                                     \

  1575.     _dmv_y = 0;                                                     \

  1576.     s->mb_intra = 1;                                                \

  1577.   }                                                                 \

  1578.   else                                                              \

  1579.   {                                                                 \

  1580.     index1 = index%6;                                               \

  1581.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1582.     else                                   val = 0;                 \

  1583.     if(size_table[index1] - val > 0)                                \

  1584.         val = get_bits(gb, size_table[index1] - val);               \

  1585.     else                                   val = 0;                 \

  1586.     sign = 0 - (val&1);                                             \

  1587.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1588.                                                                     \

  1589.     index1 = index/6;                                               \

  1590.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1591.     else                                   val = 0;                 \

  1592.     if(size_table[index1] - val > 0)                                \

  1593.         val = get_bits(gb, size_table[index1] - val);               \

  1594.     else                                   val = 0;                 \

  1595.     sign = 0 - (val&1);                                             \

  1596.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1597.   }

  1598. 

  1599. /** Predict and set motion vector

  1600.  */

  1601. 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)

  1602. {

  1603.     int xy, wrap, off = 0;

  1604.     int16_t *A, *B, *C;

  1605.     int px, py;

  1606.     int sum;

  1607. 

  1608.     /* scale MV difference to be quad-pel */

  1609.     dmv_x <<= 1 - s->quarter_sample;

  1610.     dmv_y <<= 1 - s->quarter_sample;

  1611. 

  1612.     wrap = s->b8_stride;

  1613.     xy = s->block_index[n];

  1614. 

  1615.     if(s->mb_intra){

  1616.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

  1617.         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;

  1618.         s->current_picture.motion_val[1][xy][0] = 0;

  1619.         s->current_picture.motion_val[1][xy][1] = 0;

  1620.         if(mv1) { /* duplicate motion data for 1-MV block */

  1621.             s->current_picture.motion_val[0][xy + 1][0] = 0;

  1622.             s->current_picture.motion_val[0][xy + 1][1] = 0;

  1623.             s->current_picture.motion_val[0][xy + wrap][0] = 0;

  1624.             s->current_picture.motion_val[0][xy + wrap][1] = 0;

  1625.             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;

  1626.             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

  1627.             s->current_picture.motion_val[1][xy + 1][0] = 0;

  1628.             s->current_picture.motion_val[1][xy + 1][1] = 0;

  1629.             s->current_picture.motion_val[1][xy + wrap][0] = 0;

  1630.             s->current_picture.motion_val[1][xy + wrap][1] = 0;

  1631.             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;

  1632.             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

  1633.         }

  1634.         return;

  1635.     }

  1636. 

  1637.     C = s->current_picture.motion_val[0][xy - 1];

  1638.     A = s->current_picture.motion_val[0][xy - wrap];

  1639.     if(mv1)

  1640.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1641.     else {

  1642.         //in 4-MV mode different blocks have different B predictor position

  1643.         switch(n){

  1644.         case 0:

  1645.             off = (s->mb_x > 0) ? -1 : 1;

  1646.             break;

  1647.         case 1:

  1648.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1649.             break;

  1650.         case 2:

  1651.             off = 1;

  1652.             break;

  1653.         case 3:

  1654.             off = -1;

  1655.         }

  1656.     }

  1657.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1658. 

  1659.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1660.         if(s->mb_width == 1) {

  1661.             px = A[0];

  1662.             py = A[1];

  1663.         } else {

  1664.             px = mid_pred(A[0], B[0], C[0]);

  1665.             py = mid_pred(A[1], B[1], C[1]);

  1666.         }

  1667.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1668.         px = C[0];

  1669.         py = C[1];

  1670.     } else {

  1671.         px = py = 0;

  1672.     }

  1673.     /* Pullback MV as specified in 8.3.5.3.4 */

  1674.     {

  1675.         int qx, qy, X, Y;

  1676.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1677.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1678.         X = (s->mb_width << 6) - 4;

  1679.         Y = (s->mb_height << 6) - 4;

  1680.         if(mv1) {

  1681.             if(qx + px < -60) px = -60 - qx;

  1682.             if(qy + py < -60) py = -60 - qy;

  1683.         } else {

  1684.             if(qx + px < -28) px = -28 - qx;

  1685.             if(qy + py < -28) py = -28 - qy;

  1686.         }

  1687.         if(qx + px > X) px = X - qx;

  1688.         if(qy + py > Y) py = Y - qy;

  1689.     }

  1690.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1691.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1692.         if(is_intra[xy - wrap])

  1693.             sum = FFABS(px) + FFABS(py);

  1694.         else

  1695.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1696.         if(sum > 32) {

  1697.             if(get_bits1(&s->gb)) {

  1698.                 px = A[0];

  1699.                 py = A[1];

  1700.             } else {

  1701.                 px = C[0];

  1702.                 py = C[1];

  1703.             }

  1704.         } else {

  1705.             if(is_intra[xy - 1])

  1706.                 sum = FFABS(px) + FFABS(py);

  1707.             else

  1708.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1709.             if(sum > 32) {

  1710.                 if(get_bits1(&s->gb)) {

  1711.                     px = A[0];

  1712.                     py = A[1];

  1713.                 } else {

  1714.                     px = C[0];

  1715.                     py = C[1];

  1716.                 }

  1717.             }

  1718.         }

  1719.     }

  1720.     /* store MV using signed modulus of MV range defined in 4.11 */

  1721.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1722.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1723.     if(mv1) { /* duplicate motion data for 1-MV block */

  1724.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

  1725.         s->current_picture.motion_val[0][xy + 1][1] = s->current_picture.motion_val[0][xy][1];

  1726.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1727.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1728.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1729.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1730.     }

  1731. }

  1732. 

  1733. /** Motion compensation for direct or interpolated blocks in B-frames

  1734.  */

  1735. static void vc1_interp_mc(VC1Context *v)

  1736. {

  1737.     MpegEncContext *s = &v->s;

  1738.     DSPContext *dsp = &v->s.dsp;

  1739.     uint8_t *srcY, *srcU, *srcV;

  1740.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1741. 

  1742.     if(!v->s.next_picture.data[0])return;

  1743. 

  1744.     mx = s->mv[1][0][0];

  1745.     my = s->mv[1][0][1];

  1746.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1747.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1748.     if(v->fastuvmc) {

  1749.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  1750.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  1751.     }

  1752.     srcY = s->next_picture.data[0];

  1753.     srcU = s->next_picture.data[1];

  1754.     srcV = s->next_picture.data[2];

  1755. 

  1756.     src_x = s->mb_x * 16 + (mx >> 2);

  1757.     src_y = s->mb_y * 16 + (my >> 2);

  1758.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1759.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1760. 

  1761.     if(v->profile != PROFILE_ADVANCED){

  1762.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1763.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1764.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1765.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1766.     }else{

  1767.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1768.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1769.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1770.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1771.     }

  1772. 

  1773.     srcY += src_y * s->linesize + src_x;

  1774.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1775.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1776. 

  1777.     /* for grayscale we should not try to read from unknown area */

  1778.     if(s->flags & CODEC_FLAG_GRAY) {

  1779.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1780.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1781.     }

  1782. 

  1783.     if(v->rangeredfrm

  1784.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1785.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1786.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1787. 

  1788.         srcY -= s->mspel * (1 + s->linesize);

  1789.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  1790.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1791.         srcY = s->edge_emu_buffer;

  1792.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1793.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1794.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1795.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1796.         srcU = uvbuf;

  1797.         srcV = uvbuf + 16;

  1798.         /* if we deal with range reduction we need to scale source blocks */

  1799.         if(v->rangeredfrm) {

  1800.             int i, j;

  1801.             uint8_t *src, *src2;

  1802. 

  1803.             src = srcY;

  1804.             for(j = 0; j < 17 + s->mspel*2; j++) {

  1805.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1806.                 src += s->linesize;

  1807.             }

  1808.             src = srcU; src2 = srcV;

  1809.             for(j = 0; j < 9; j++) {

  1810.                 for(i = 0; i < 9; i++) {

  1811.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1812.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1813.                 }

  1814.                 src += s->uvlinesize;

  1815.                 src2 += s->uvlinesize;

  1816.             }

  1817.         }

  1818.         srcY += s->mspel * (1 + s->linesize);

  1819.     }

  1820. 

  1821.     mx >>= 1;

  1822.     my >>= 1;

  1823.     dxy = ((my & 1) << 1) | (mx & 1);

  1824. 

  1825.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1826. 

  1827.     if(s->flags & CODEC_FLAG_GRAY) return;

  1828.     /* Chroma MC always uses qpel blilinear */

  1829.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1830.     uvmx = (uvmx&3)<<1;

  1831.     uvmy = (uvmy&3)<<1;

  1832.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1833.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1834. }

  1835. 

  1836. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1837. {

  1838.     int n = bfrac;

  1839. 

  1840. #if B_FRACTION_DEN==256

  1841.     if(inv)

  1842.         n -= 256;

  1843.     if(!qs)

  1844.         return 2 * ((value * n + 255) >> 9);

  1845.     return (value * n + 128) >> 8;

  1846. #else

  1847.     if(inv)

  1848.         n -= B_FRACTION_DEN;

  1849.     if(!qs)

  1850.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1851.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1852. #endif

  1853. }

  1854. 

  1855. /** Reconstruct motion vector for B-frame and do motion compensation

  1856.  */

  1857. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1858. {

  1859.     if(v->use_ic) {

  1860.         v->mv_mode2 = v->mv_mode;

  1861.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  1862.     }

  1863.     if(direct) {

  1864.         vc1_mc_1mv(v, 0);

  1865.         vc1_interp_mc(v);

  1866.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1867.         return;

  1868.     }

  1869.     if(mode == BMV_TYPE_INTERPOLATED) {

  1870.         vc1_mc_1mv(v, 0);

  1871.         vc1_interp_mc(v);

  1872.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1873.         return;

  1874.     }

  1875. 

  1876.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  1877.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  1878.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  1879. }

  1880. 

  1881. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  1882. {

  1883.     MpegEncContext *s = &v->s;

  1884.     int xy, wrap, off = 0;

  1885.     int16_t *A, *B, *C;

  1886.     int px, py;

  1887.     int sum;

  1888.     int r_x, r_y;

  1889.     const uint8_t *is_intra = v->mb_type[0];

  1890. 

  1891.     r_x = v->range_x;

  1892.     r_y = v->range_y;

  1893.     /* scale MV difference to be quad-pel */

  1894.     dmv_x[0] <<= 1 - s->quarter_sample;

  1895.     dmv_y[0] <<= 1 - s->quarter_sample;

  1896.     dmv_x[1] <<= 1 - s->quarter_sample;

  1897.     dmv_y[1] <<= 1 - s->quarter_sample;

  1898. 

  1899.     wrap = s->b8_stride;

  1900.     xy = s->block_index[0];

  1901. 

  1902.     if(s->mb_intra) {

  1903.         s->current_picture.motion_val[0][xy][0] =

  1904.         s->current_picture.motion_val[0][xy][1] =

  1905.         s->current_picture.motion_val[1][xy][0] =

  1906.         s->current_picture.motion_val[1][xy][1] = 0;

  1907.         return;

  1908.     }

  1909.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  1910.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  1911.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  1912.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  1913. 

  1914.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  1915.     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));

  1916.     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));

  1917.     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));

  1918.     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));

  1919.     if(direct) {

  1920.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  1921.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  1922.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  1923.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  1924.         return;

  1925.     }

  1926. 

  1927.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  1928.         C = s->current_picture.motion_val[0][xy - 2];

  1929.         A = s->current_picture.motion_val[0][xy - wrap*2];

  1930.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1931.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  1932. 

  1933.         if(!s->mb_x) C[0] = C[1] = 0;

  1934.         if(!s->first_slice_line) { // predictor A is not out of bounds

  1935.             if(s->mb_width == 1) {

  1936.                 px = A[0];

  1937.                 py = A[1];

  1938.             } else {

  1939.                 px = mid_pred(A[0], B[0], C[0]);

  1940.                 py = mid_pred(A[1], B[1], C[1]);

  1941.             }

  1942.         } else if(s->mb_x) { // predictor C is not out of bounds

  1943.             px = C[0];

  1944.             py = C[1];

  1945.         } else {

  1946.             px = py = 0;

  1947.         }

  1948.         /* Pullback MV as specified in 8.3.5.3.4 */

  1949.         {

  1950.             int qx, qy, X, Y;

  1951.             if(v->profile < PROFILE_ADVANCED) {

  1952.                 qx = (s->mb_x << 5);

  1953.                 qy = (s->mb_y << 5);

  1954.                 X = (s->mb_width << 5) - 4;

  1955.                 Y = (s->mb_height << 5) - 4;

  1956.                 if(qx + px < -28) px = -28 - qx;

  1957.                 if(qy + py < -28) py = -28 - qy;

  1958.                 if(qx + px > X) px = X - qx;

  1959.                 if(qy + py > Y) py = Y - qy;

  1960.             } else {

  1961.                 qx = (s->mb_x << 6);

  1962.                 qy = (s->mb_y << 6);

  1963.                 X = (s->mb_width << 6) - 4;

  1964.                 Y = (s->mb_height << 6) - 4;

  1965.                 if(qx + px < -60) px = -60 - qx;

  1966.                 if(qy + py < -60) py = -60 - qy;

  1967.                 if(qx + px > X) px = X - qx;

  1968.                 if(qy + py > Y) py = Y - qy;

  1969.             }

  1970.         }

  1971.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1972.         if(0 && !s->first_slice_line && s->mb_x) {

  1973.             if(is_intra[xy - wrap])

  1974.                 sum = FFABS(px) + FFABS(py);

  1975.             else

  1976.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1977.             if(sum > 32) {

  1978.                 if(get_bits1(&s->gb)) {

  1979.                     px = A[0];

  1980.                     py = A[1];

  1981.                 } else {

  1982.                     px = C[0];

  1983.                     py = C[1];

  1984.                 }

  1985.             } else {

  1986.                 if(is_intra[xy - 2])

  1987.                     sum = FFABS(px) + FFABS(py);

  1988.                 else

  1989.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1990.                 if(sum > 32) {

  1991.                     if(get_bits1(&s->gb)) {

  1992.                         px = A[0];

  1993.                         py = A[1];

  1994.                     } else {

  1995.                         px = C[0];

  1996.                         py = C[1];

  1997.                     }

  1998.                 }

  1999.             }

  2000.         }

  2001.         /* store MV using signed modulus of MV range defined in 4.11 */

  2002.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2003.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2004.     }

  2005.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2006.         C = s->current_picture.motion_val[1][xy - 2];

  2007.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2008.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2009.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2010. 

  2011.         if(!s->mb_x) C[0] = C[1] = 0;

  2012.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2013.             if(s->mb_width == 1) {

  2014.                 px = A[0];

  2015.                 py = A[1];

  2016.             } else {

  2017.                 px = mid_pred(A[0], B[0], C[0]);

  2018.                 py = mid_pred(A[1], B[1], C[1]);

  2019.             }

  2020.         } else if(s->mb_x) { // predictor C is not out of bounds

  2021.             px = C[0];

  2022.             py = C[1];

  2023.         } else {

  2024.             px = py = 0;

  2025.         }

  2026.         /* Pullback MV as specified in 8.3.5.3.4 */

  2027.         {

  2028.             int qx, qy, X, Y;

  2029.             if(v->profile < PROFILE_ADVANCED) {

  2030.                 qx = (s->mb_x << 5);

  2031.                 qy = (s->mb_y << 5);

  2032.                 X = (s->mb_width << 5) - 4;

  2033.                 Y = (s->mb_height << 5) - 4;

  2034.                 if(qx + px < -28) px = -28 - qx;

  2035.                 if(qy + py < -28) py = -28 - qy;

  2036.                 if(qx + px > X) px = X - qx;

  2037.                 if(qy + py > Y) py = Y - qy;

  2038.             } else {

  2039.                 qx = (s->mb_x << 6);

  2040.                 qy = (s->mb_y << 6);

  2041.                 X = (s->mb_width << 6) - 4;

  2042.                 Y = (s->mb_height << 6) - 4;

  2043.                 if(qx + px < -60) px = -60 - qx;

  2044.                 if(qy + py < -60) py = -60 - qy;

  2045.                 if(qx + px > X) px = X - qx;

  2046.                 if(qy + py > Y) py = Y - qy;

  2047.             }

  2048.         }

  2049.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2050.         if(0 && !s->first_slice_line && s->mb_x) {

  2051.             if(is_intra[xy - wrap])

  2052.                 sum = FFABS(px) + FFABS(py);

  2053.             else

  2054.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2055.             if(sum > 32) {

  2056.                 if(get_bits1(&s->gb)) {

  2057.                     px = A[0];

  2058.                     py = A[1];

  2059.                 } else {

  2060.                     px = C[0];

  2061.                     py = C[1];

  2062.                 }

  2063.             } else {

  2064.                 if(is_intra[xy - 2])

  2065.                     sum = FFABS(px) + FFABS(py);

  2066.                 else

  2067.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2068.                 if(sum > 32) {

  2069.                     if(get_bits1(&s->gb)) {

  2070.                         px = A[0];

  2071.                         py = A[1];

  2072.                     } else {

  2073.                         px = C[0];

  2074.                         py = C[1];

  2075.                     }

  2076.                 }

  2077.             }

  2078.         }

  2079.         /* store MV using signed modulus of MV range defined in 4.11 */

  2080. 

  2081.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2082.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2083.     }

  2084.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2085.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2086.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2087.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2088. }

  2089. 

  2090. /** Get predicted DC value for I-frames only

  2091.  * prediction dir: left=0, top=1

  2092.  * @param s MpegEncContext

  2093.  * @param[in] n block index in the current MB

  2094.  * @param dc_val_ptr Pointer to DC predictor

  2095.  * @param dir_ptr Prediction direction for use in AC prediction

  2096.  */

  2097. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2098.                               int16_t **dc_val_ptr, int *dir_ptr)

  2099. {

  2100.     int a, b, c, wrap, pred, scale;

  2101.     int16_t *dc_val;

  2102.     static const uint16_t dcpred[32] = {

  2103.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2104.          114,  102,   93,   85,   79,   73,   68,   64,

  2105.           60,   57,   54,   51,   49,   47,   45,   43,

  2106.           41,   39,   38,   37,   35,   34,   33

  2107.     };

  2108. 

  2109.     /* find prediction - wmv3_dc_scale always used here in fact */

  2110.     if (n < 4)     scale = s->y_dc_scale;

  2111.     else           scale = s->c_dc_scale;

  2112. 

  2113.     wrap = s->block_wrap[n];

  2114.     dc_val= s->dc_val[0] + s->block_index[n];

  2115. 

  2116.     /* B A

  2117.      * C X

  2118.      */

  2119.     c = dc_val[ - 1];

  2120.     b = dc_val[ - 1 - wrap];

  2121.     a = dc_val[ - wrap];

  2122. 

  2123.     if (pq < 9 || !overlap)

  2124.     {

  2125.         /* Set outer values */

  2126.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2127.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2128.     }

  2129.     else

  2130.     {

  2131.         /* Set outer values */

  2132.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2133.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2134.     }

  2135. 

  2136.     if (abs(a - b) <= abs(b - c)) {

  2137.         pred = c;

  2138.         *dir_ptr = 1;//left

  2139.     } else {

  2140.         pred = a;

  2141.         *dir_ptr = 0;//top

  2142.     }

  2143. 

  2144.     /* update predictor */

  2145.     *dc_val_ptr = &dc_val[0];

  2146.     return pred;

  2147. }

  2148. 

  2149. 

  2150. /** Get predicted DC value

  2151.  * prediction dir: left=0, top=1

  2152.  * @param s MpegEncContext

  2153.  * @param[in] n block index in the current MB

  2154.  * @param dc_val_ptr Pointer to DC predictor

  2155.  * @param dir_ptr Prediction direction for use in AC prediction

  2156.  */

  2157. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2158.                               int a_avail, int c_avail,

  2159.                               int16_t **dc_val_ptr, int *dir_ptr)

  2160. {

  2161.     int a, b, c, wrap, pred, scale;

  2162.     int16_t *dc_val;

  2163.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2164.     int q1, q2 = 0;

  2165. 

  2166.     /* find prediction - wmv3_dc_scale always used here in fact */

  2167.     if (n < 4)     scale = s->y_dc_scale;

  2168.     else           scale = s->c_dc_scale;

  2169. 

  2170.     wrap = s->block_wrap[n];

  2171.     dc_val= s->dc_val[0] + s->block_index[n];

  2172. 

  2173.     /* B A

  2174.      * C X

  2175.      */

  2176.     c = dc_val[ - 1];

  2177.     b = dc_val[ - 1 - wrap];

  2178.     a = dc_val[ - wrap];

  2179.     /* scale predictors if needed */

  2180.     q1 = s->current_picture.qscale_table[mb_pos];

  2181.     if(c_avail && (n!= 1 && n!=3)) {

  2182.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2183.         if(q2 && q2 != q1)

  2184.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2185.     }

  2186.     if(a_avail && (n!= 2 && n!=3)) {

  2187.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2188.         if(q2 && q2 != q1)

  2189.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2190.     }

  2191.     if(a_avail && c_avail && (n!=3)) {

  2192.         int off = mb_pos;

  2193.         if(n != 1) off--;

  2194.         if(n != 2) off -= s->mb_stride;

  2195.         q2 = s->current_picture.qscale_table[off];

  2196.         if(q2 && q2 != q1)

  2197.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2198.     }

  2199. 

  2200.     if(a_avail && c_avail) {

  2201.         if(abs(a - b) <= abs(b - c)) {

  2202.             pred = c;

  2203.             *dir_ptr = 1;//left

  2204.         } else {

  2205.             pred = a;

  2206.             *dir_ptr = 0;//top

  2207.         }

  2208.     } else if(a_avail) {

  2209.         pred = a;

  2210.         *dir_ptr = 0;//top

  2211.     } else if(c_avail) {

  2212.         pred = c;

  2213.         *dir_ptr = 1;//left

  2214.     } else {

  2215.         pred = 0;

  2216.         *dir_ptr = 1;//left

  2217.     }

  2218. 

  2219.     /* update predictor */

  2220.     *dc_val_ptr = &dc_val[0];

  2221.     return pred;

  2222. }

  2223. 

  2224. 

  2225. /**

  2226.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2227.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2228.  * @{

  2229.  */

  2230. 

  2231. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2232. {

  2233.     int xy, wrap, pred, a, b, c;

  2234. 

  2235.     xy = s->block_index[n];

  2236.     wrap = s->b8_stride;

  2237. 

  2238.     /* B C

  2239.      * A X

  2240.      */

  2241.     a = s->coded_block[xy - 1       ];

  2242.     b = s->coded_block[xy - 1 - wrap];

  2243.     c = s->coded_block[xy     - wrap];

  2244. 

  2245.     if (b == c) {

  2246.         pred = a;

  2247.     } else {

  2248.         pred = c;

  2249.     }

  2250. 

  2251.     /* store value */

  2252.     *coded_block_ptr = &s->coded_block[xy];

  2253. 

  2254.     return pred;

  2255. }

  2256. 

  2257. /**

  2258.  * Decode one AC coefficient

  2259.  * @param v The VC1 context

  2260.  * @param last Last coefficient

  2261.  * @param skip How much zero coefficients to skip

  2262.  * @param value Decoded AC coefficient value

  2263.  * @see 8.1.3.4

  2264.  */

  2265. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2266. {

  2267.     GetBitContext *gb = &v->s.gb;

  2268.     int index, escape, run = 0, level = 0, lst = 0;

  2269. 

  2270.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2271.     if (index != vc1_ac_sizes[codingset] - 1) {

  2272.         run = vc1_index_decode_table[codingset][index][0];

  2273.         level = vc1_index_decode_table[codingset][index][1];

  2274.         lst = index >= vc1_last_decode_table[codingset];

  2275.         if(get_bits1(gb))

  2276.             level = -level;

  2277.     } else {

  2278.         escape = decode210(gb);

  2279.         if (escape != 2) {

  2280.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2281.             run = vc1_index_decode_table[codingset][index][0];

  2282.             level = vc1_index_decode_table[codingset][index][1];

  2283.             lst = index >= vc1_last_decode_table[codingset];

  2284.             if(escape == 0) {

  2285.                 if(lst)

  2286.                     level += vc1_last_delta_level_table[codingset][run];

  2287.                 else

  2288.                     level += vc1_delta_level_table[codingset][run];

  2289.             } else {

  2290.                 if(lst)

  2291.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2292.                 else

  2293.                     run += vc1_delta_run_table[codingset][level] + 1;

  2294.             }

  2295.             if(get_bits1(gb))

  2296.                 level = -level;

  2297.         } else {

  2298.             int sign;

  2299.             lst = get_bits1(gb);

  2300.             if(v->s.esc3_level_length == 0) {

  2301.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2302.                     v->s.esc3_level_length = get_bits(gb, 3);

  2303.                     if(!v->s.esc3_level_length)

  2304.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2305.                 } else { //table 60

  2306.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  2307.                 }

  2308.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2309.             }

  2310.             run = get_bits(gb, v->s.esc3_run_length);

  2311.             sign = get_bits1(gb);

  2312.             level = get_bits(gb, v->s.esc3_level_length);

  2313.             if(sign)

  2314.                 level = -level;

  2315.         }

  2316.     }

  2317. 

  2318.     *last = lst;

  2319.     *skip = run;

  2320.     *value = level;

  2321. }

  2322. 

  2323. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2324.  * @param v VC1Context

  2325.  * @param block block to decode

  2326.  * @param coded are AC coeffs present or not

  2327.  * @param codingset set of VLC to decode data

  2328.  */

  2329. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2330. {

  2331.     GetBitContext *gb = &v->s.gb;

  2332.     MpegEncContext *s = &v->s;

  2333.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2334.     int run_diff, i;

  2335.     int16_t *dc_val;

  2336.     int16_t *ac_val, *ac_val2;

  2337.     int dcdiff;

  2338. 

  2339.     /* Get DC differential */

  2340.     if (n < 4) {

  2341.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2342.     } else {

  2343.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2344.     }

  2345.     if (dcdiff < 0){

  2346.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2347.         return -1;

  2348.     }

  2349.     if (dcdiff)

  2350.     {

  2351.         if (dcdiff == 119 /* ESC index value */)

  2352.         {

  2353.             /* TODO: Optimize */

  2354.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2355.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2356.             else dcdiff = get_bits(gb, 8);

  2357.         }

  2358.         else

  2359.         {

  2360.             if (v->pq == 1)

  2361.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2362.             else if (v->pq == 2)

  2363.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2364.         }

  2365.         if (get_bits1(gb))

  2366.             dcdiff = -dcdiff;

  2367.     }

  2368. 

  2369.     /* Prediction */

  2370.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2371.     *dc_val = dcdiff;

  2372. 

  2373.     /* Store the quantized DC coeff, used for prediction */

  2374.     if (n < 4) {

  2375.         block[0] = dcdiff * s->y_dc_scale;

  2376.     } else {

  2377.         block[0] = dcdiff * s->c_dc_scale;

  2378.     }

  2379.     /* Skip ? */

  2380.     run_diff = 0;

  2381.     i = 0;

  2382.     if (!coded) {

  2383.         goto not_coded;

  2384.     }

  2385. 

  2386.     //AC Decoding

  2387.     i = 1;

  2388. 

  2389.     {

  2390.         int last = 0, skip, value;

  2391.         const int8_t *zz_table;

  2392.         int scale;

  2393.         int k;

  2394. 

  2395.         scale = v->pq * 2 + v->halfpq;

  2396. 

  2397.         if(v->s.ac_pred) {

  2398.             if(!dc_pred_dir)

  2399.                 zz_table = ff_vc1_horizontal_zz;

  2400.             else

  2401.                 zz_table = ff_vc1_vertical_zz;

  2402.         } else

  2403.             zz_table = ff_vc1_normal_zz;

  2404. 

  2405.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2406.         ac_val2 = ac_val;

  2407.         if(dc_pred_dir) //left

  2408.             ac_val -= 16;

  2409.         else //top

  2410.             ac_val -= 16 * s->block_wrap[n];

  2411. 

  2412.         while (!last) {

  2413.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2414.             i += skip;

  2415.             if(i > 63)

  2416.                 break;

  2417.             block[zz_table[i++]] = value;

  2418.         }

  2419. 

  2420.         /* apply AC prediction if needed */

  2421.         if(s->ac_pred) {

  2422.             if(dc_pred_dir) { //left

  2423.                 for(k = 1; k < 8; k++)

  2424.                     block[k << 3] += ac_val[k];

  2425.             } else { //top

  2426.                 for(k = 1; k < 8; k++)

  2427.                     block[k] += ac_val[k + 8];

  2428.             }

  2429.         }

  2430.         /* save AC coeffs for further prediction */

  2431.         for(k = 1; k < 8; k++) {

  2432.             ac_val2[k] = block[k << 3];

  2433.             ac_val2[k + 8] = block[k];

  2434.         }

  2435. 

  2436.         /* scale AC coeffs */

  2437.         for(k = 1; k < 64; k++)

  2438.             if(block[k]) {

  2439.                 block[k] *= scale;

  2440.                 if(!v->pquantizer)

  2441.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2442.             }

  2443. 

  2444.         if(s->ac_pred) i = 63;

  2445.     }

  2446. 

  2447. not_coded:

  2448.     if(!coded) {

  2449.         int k, scale;

  2450.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2451.         ac_val2 = ac_val;

  2452. 

  2453.         scale = v->pq * 2 + v->halfpq;

  2454.         memset(ac_val2, 0, 16 * 2);

  2455.         if(dc_pred_dir) {//left

  2456.             ac_val -= 16;

  2457.             if(s->ac_pred)

  2458.                 memcpy(ac_val2, ac_val, 8 * 2);

  2459.         } else {//top

  2460.             ac_val -= 16 * s->block_wrap[n];

  2461.             if(s->ac_pred)

  2462.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2463.         }

  2464. 

  2465.         /* apply AC prediction if needed */

  2466.         if(s->ac_pred) {

  2467.             if(dc_pred_dir) { //left

  2468.                 for(k = 1; k < 8; k++) {

  2469.                     block[k << 3] = ac_val[k] * scale;

  2470.                     if(!v->pquantizer && block[k << 3])

  2471.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2472.                 }

  2473.             } else { //top

  2474.                 for(k = 1; k < 8; k++) {

  2475.                     block[k] = ac_val[k + 8] * scale;

  2476.                     if(!v->pquantizer && block[k])

  2477.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2478.                 }

  2479.             }

  2480.             i = 63;

  2481.         }

  2482.     }

  2483.     s->block_last_index[n] = i;

  2484. 

  2485.     return 0;

  2486. }

  2487. 

  2488. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2489.  * @param v VC1Context

  2490.  * @param block block to decode

  2491.  * @param coded are AC coeffs present or not

  2492.  * @param codingset set of VLC to decode data

  2493.  */

  2494. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2495. {

  2496.     GetBitContext *gb = &v->s.gb;

  2497.     MpegEncContext *s = &v->s;

  2498.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2499.     int run_diff, i;

  2500.     int16_t *dc_val;

  2501.     int16_t *ac_val, *ac_val2;

  2502.     int dcdiff;

  2503.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2504.     int use_pred = s->ac_pred;

  2505.     int scale;

  2506.     int q1, q2 = 0;

  2507.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2508. 

  2509.     /* Get DC differential */

  2510.     if (n < 4) {

  2511.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2512.     } else {

  2513.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2514.     }

  2515.     if (dcdiff < 0){

  2516.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2517.         return -1;

  2518.     }

  2519.     if (dcdiff)

  2520.     {

  2521.         if (dcdiff == 119 /* ESC index value */)

  2522.         {

  2523.             /* TODO: Optimize */

  2524.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2525.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2526.             else dcdiff = get_bits(gb, 8);

  2527.         }

  2528.         else

  2529.         {

  2530.             if (mquant == 1)

  2531.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2532.             else if (mquant == 2)

  2533.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2534.         }

  2535.         if (get_bits1(gb))

  2536.             dcdiff = -dcdiff;

  2537.     }

  2538. 

  2539.     /* Prediction */

  2540.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2541.     *dc_val = dcdiff;

  2542. 

  2543.     /* Store the quantized DC coeff, used for prediction */

  2544.     if (n < 4) {

  2545.         block[0] = dcdiff * s->y_dc_scale;

  2546.     } else {

  2547.         block[0] = dcdiff * s->c_dc_scale;

  2548.     }

  2549.     /* Skip ? */

  2550.     run_diff = 0;

  2551.     i = 0;

  2552. 

  2553.     //AC Decoding

  2554.     i = 1;

  2555. 

  2556.     /* check if AC is needed at all */

  2557.     if(!a_avail && !c_avail) use_pred = 0;

  2558.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2559.     ac_val2 = ac_val;

  2560. 

  2561.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  2562. 

  2563.     if(dc_pred_dir) //left

  2564.         ac_val -= 16;

  2565.     else //top

  2566.         ac_val -= 16 * s->block_wrap[n];

  2567. 

  2568.     q1 = s->current_picture.qscale_table[mb_pos];

  2569.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2570.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2571.     if(dc_pred_dir && n==1) q2 = q1;

  2572.     if(!dc_pred_dir && n==2) q2 = q1;

  2573.     if(n==3) q2 = q1;

  2574. 

  2575.     if(coded) {

  2576.         int last = 0, skip, value;

  2577.         const int8_t *zz_table;

  2578.         int k;

  2579. 

  2580.         if(v->s.ac_pred) {

  2581.             if(!dc_pred_dir)

  2582.                 zz_table = ff_vc1_horizontal_zz;

  2583.             else

  2584.                 zz_table = ff_vc1_vertical_zz;

  2585.         } else

  2586.             zz_table = ff_vc1_normal_zz;

  2587. 

  2588.         while (!last) {

  2589.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2590.             i += skip;

  2591.             if(i > 63)

  2592.                 break;

  2593.             block[zz_table[i++]] = value;

  2594.         }

  2595. 

  2596.         /* apply AC prediction if needed */

  2597.         if(use_pred) {

  2598.             /* scale predictors if needed*/

  2599.             if(q2 && q1!=q2) {

  2600.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2601.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2602. 

  2603.                 if(dc_pred_dir) { //left

  2604.                     for(k = 1; k < 8; k++)

  2605.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2606.                 } else { //top

  2607.                     for(k = 1; k < 8; k++)

  2608.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2609.                 }

  2610.             } else {

  2611.                 if(dc_pred_dir) { //left

  2612.                     for(k = 1; k < 8; k++)

  2613.                         block[k << 3] += ac_val[k];

  2614.                 } else { //top

  2615.                     for(k = 1; k < 8; k++)

  2616.                         block[k] += ac_val[k + 8];

  2617.                 }

  2618.             }

  2619.         }

  2620.         /* save AC coeffs for further prediction */

  2621.         for(k = 1; k < 8; k++) {

  2622.             ac_val2[k] = block[k << 3];

  2623.             ac_val2[k + 8] = block[k];

  2624.         }

  2625. 

  2626.         /* scale AC coeffs */

  2627.         for(k = 1; k < 64; k++)

  2628.             if(block[k]) {

  2629.                 block[k] *= scale;

  2630.                 if(!v->pquantizer)

  2631.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2632.             }

  2633. 

  2634.         if(use_pred) i = 63;

  2635.     } else { // no AC coeffs

  2636.         int k;

  2637. 

  2638.         memset(ac_val2, 0, 16 * 2);

  2639.         if(dc_pred_dir) {//left

  2640.             if(use_pred) {

  2641.                 memcpy(ac_val2, ac_val, 8 * 2);

  2642.                 if(q2 && q1!=q2) {

  2643.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2644.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2645.                     for(k = 1; k < 8; k++)

  2646.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2647.                 }

  2648.             }

  2649.         } else {//top

  2650.             if(use_pred) {

  2651.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2652.                 if(q2 && q1!=q2) {

  2653.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2654.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2655.                     for(k = 1; k < 8; k++)

  2656.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2657.                 }

  2658.             }

  2659.         }

  2660. 

  2661.         /* apply AC prediction if needed */

  2662.         if(use_pred) {

  2663.             if(dc_pred_dir) { //left

  2664.                 for(k = 1; k < 8; k++) {

  2665.                     block[k << 3] = ac_val2[k] * scale;

  2666.                     if(!v->pquantizer && block[k << 3])

  2667.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2668.                 }

  2669.             } else { //top

  2670.                 for(k = 1; k < 8; k++) {

  2671.                     block[k] = ac_val2[k + 8] * scale;

  2672.                     if(!v->pquantizer && block[k])

  2673.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2674.                 }

  2675.             }

  2676.             i = 63;

  2677.         }

  2678.     }

  2679.     s->block_last_index[n] = i;

  2680. 

  2681.     return 0;

  2682. }

  2683. 

  2684. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2685.  * @param v VC1Context

  2686.  * @param block block to decode

  2687.  * @param coded are AC coeffs present or not

  2688.  * @param mquant block quantizer

  2689.  * @param codingset set of VLC to decode data

  2690.  */

  2691. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2692. {

  2693.     GetBitContext *gb = &v->s.gb;

  2694.     MpegEncContext *s = &v->s;

  2695.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2696.     int run_diff, i;

  2697.     int16_t *dc_val;

  2698.     int16_t *ac_val, *ac_val2;

  2699.     int dcdiff;

  2700.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2701.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2702.     int use_pred = s->ac_pred;

  2703.     int scale;

  2704.     int q1, q2 = 0;

  2705. 

  2706.     /* XXX: Guard against dumb values of mquant */

  2707.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2708. 

  2709.     /* Set DC scale - y and c use the same */

  2710.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2711.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2712. 

  2713.     /* Get DC differential */

  2714.     if (n < 4) {

  2715.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2716.     } else {

  2717.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2718.     }

  2719.     if (dcdiff < 0){

  2720.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2721.         return -1;

  2722.     }

  2723.     if (dcdiff)

  2724.     {

  2725.         if (dcdiff == 119 /* ESC index value */)

  2726.         {

  2727.             /* TODO: Optimize */

  2728.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2729.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2730.             else dcdiff = get_bits(gb, 8);

  2731.         }

  2732.         else

  2733.         {

  2734.             if (mquant == 1)

  2735.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2736.             else if (mquant == 2)

  2737.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2738.         }

  2739.         if (get_bits1(gb))

  2740.             dcdiff = -dcdiff;

  2741.     }

  2742. 

  2743.     /* Prediction */

  2744.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2745.     *dc_val = dcdiff;

  2746. 

  2747.     /* Store the quantized DC coeff, used for prediction */

  2748. 

  2749.     if (n < 4) {

  2750.         block[0] = dcdiff * s->y_dc_scale;

  2751.     } else {

  2752.         block[0] = dcdiff * s->c_dc_scale;

  2753.     }

  2754.     /* Skip ? */

  2755.     run_diff = 0;

  2756.     i = 0;

  2757. 

  2758.     //AC Decoding

  2759.     i = 1;

  2760. 

  2761.     /* check if AC is needed at all and adjust direction if needed */

  2762.     if(!a_avail) dc_pred_dir = 1;

  2763.     if(!c_avail) dc_pred_dir = 0;

  2764.     if(!a_avail && !c_avail) use_pred = 0;

  2765.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2766.     ac_val2 = ac_val;

  2767. 

  2768.     scale = mquant * 2 + v->halfpq;

  2769. 

  2770.     if(dc_pred_dir) //left

  2771.         ac_val -= 16;

  2772.     else //top

  2773.         ac_val -= 16 * s->block_wrap[n];

  2774. 

  2775.     q1 = s->current_picture.qscale_table[mb_pos];

  2776.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2777.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2778.     if(dc_pred_dir && n==1) q2 = q1;

  2779.     if(!dc_pred_dir && n==2) q2 = q1;

  2780.     if(n==3) q2 = q1;

  2781. 

  2782.     if(coded) {

  2783.         int last = 0, skip, value;

  2784.         const int8_t *zz_table;

  2785.         int k;

  2786. 

  2787.         zz_table = ff_vc1_simple_progressive_8x8_zz;

  2788. 

  2789.         while (!last) {

  2790.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2791.             i += skip;

  2792.             if(i > 63)

  2793.                 break;

  2794.             block[zz_table[i++]] = value;

  2795.         }

  2796. 

  2797.         /* apply AC prediction if needed */

  2798.         if(use_pred) {

  2799.             /* scale predictors if needed*/

  2800.             if(q2 && q1!=q2) {

  2801.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2802.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2803. 

  2804.                 if(dc_pred_dir) { //left

  2805.                     for(k = 1; k < 8; k++)

  2806.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2807.                 } else { //top

  2808.                     for(k = 1; k < 8; k++)

  2809.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2810.                 }

  2811.             } else {

  2812.                 if(dc_pred_dir) { //left

  2813.                     for(k = 1; k < 8; k++)

  2814.                         block[k << 3] += ac_val[k];

  2815.                 } else { //top

  2816.                     for(k = 1; k < 8; k++)

  2817.                         block[k] += ac_val[k + 8];

  2818.                 }

  2819.             }

  2820.         }

  2821.         /* save AC coeffs for further prediction */

  2822.         for(k = 1; k < 8; k++) {

  2823.             ac_val2[k] = block[k << 3];

  2824.             ac_val2[k + 8] = block[k];

  2825.         }

  2826. 

  2827.         /* scale AC coeffs */

  2828.         for(k = 1; k < 64; k++)

  2829.             if(block[k]) {

  2830.                 block[k] *= scale;

  2831.                 if(!v->pquantizer)

  2832.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2833.             }

  2834. 

  2835.         if(use_pred) i = 63;

  2836.     } else { // no AC coeffs

  2837.         int k;

  2838. 

  2839.         memset(ac_val2, 0, 16 * 2);

  2840.         if(dc_pred_dir) {//left

  2841.             if(use_pred) {

  2842.                 memcpy(ac_val2, ac_val, 8 * 2);

  2843.                 if(q2 && q1!=q2) {

  2844.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2845.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2846.                     for(k = 1; k < 8; k++)

  2847.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2848.                 }

  2849.             }

  2850.         } else {//top

  2851.             if(use_pred) {

  2852.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2853.                 if(q2 && q1!=q2) {

  2854.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2855.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2856.                     for(k = 1; k < 8; k++)

  2857.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2858.                 }

  2859.             }

  2860.         }

  2861. 

  2862.         /* apply AC prediction if needed */

  2863.         if(use_pred) {

  2864.             if(dc_pred_dir) { //left

  2865.                 for(k = 1; k < 8; k++) {

  2866.                     block[k << 3] = ac_val2[k] * scale;

  2867.                     if(!v->pquantizer && block[k << 3])

  2868.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2869.                 }

  2870.             } else { //top

  2871.                 for(k = 1; k < 8; k++) {

  2872.                     block[k] = ac_val2[k + 8] * scale;

  2873.                     if(!v->pquantizer && block[k])

  2874.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2875.                 }

  2876.             }

  2877.             i = 63;

  2878.         }

  2879.     }

  2880.     s->block_last_index[n] = i;

  2881. 

  2882.     return 0;

  2883. }

  2884. 

  2885. /** Decode P block

  2886.  */

  2887. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block,

  2888.                               uint8_t *dst, int linesize, int skip_block)

  2889. {

  2890.     MpegEncContext *s = &v->s;

  2891.     GetBitContext *gb = &s->gb;

  2892.     int i, j;

  2893.     int subblkpat = 0;

  2894.     int scale, off, idx, last, skip, value;

  2895.     int ttblk = ttmb & 7;

  2896. 

  2897.     if(ttmb == -1) {

  2898.         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)];

  2899.     }

  2900.     if(ttblk == TT_4X4) {

  2901.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2902.     }

  2903.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2904.         subblkpat = decode012(gb);

  2905.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2906.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2907.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2908.     }

  2909.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  2910. 

  2911.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2912.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2913.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2914.         ttblk = TT_8X4;

  2915.     }

  2916.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2917.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2918.         ttblk = TT_4X8;

  2919.     }

  2920.     switch(ttblk) {

  2921.     case TT_8X8:

  2922.         i = 0;

  2923.         last = 0;

  2924.         while (!last) {

  2925.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2926.             i += skip;

  2927.             if(i > 63)

  2928.                 break;

  2929.             idx = ff_vc1_simple_progressive_8x8_zz[i++];

  2930.             block[idx] = value * scale;

  2931.             if(!v->pquantizer)

  2932.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2933.         }

  2934.         if(!skip_block){

  2935.             s->dsp.vc1_inv_trans_8x8(block);

  2936.             s->dsp.add_pixels_clamped(block, dst, linesize);

  2937.         }

  2938.         break;

  2939.     case TT_4X4:

  2940.         for(j = 0; j < 4; j++) {

  2941.             last = subblkpat & (1 << (3 - j));

  2942.             i = 0;

  2943.             off = (j & 1) * 4 + (j & 2) * 16;

  2944.             while (!last) {

  2945.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2946.                 i += skip;

  2947.                 if(i > 15)

  2948.                     break;

  2949.                 idx = ff_vc1_simple_progressive_4x4_zz[i++];

  2950.                 block[idx + off] = value * scale;

  2951.                 if(!v->pquantizer)

  2952.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2953.             }

  2954.             if(!(subblkpat & (1 << (3 - j))) && !skip_block)

  2955.                 s->dsp.vc1_inv_trans_4x4(dst + (j&1)*4 + (j&2)*2*linesize, linesize, block + off);

  2956.         }

  2957.         break;

  2958.     case TT_8X4:

  2959.         for(j = 0; j < 2; j++) {

  2960.             last = subblkpat & (1 << (1 - j));

  2961.             i = 0;

  2962.             off = j * 32;

  2963.             while (!last) {

  2964.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2965.                 i += skip;

  2966.                 if(i > 31)

  2967.                     break;

  2968.                 idx = v->zz_8x4[i++]+off;

  2969.                 block[idx] = value * scale;

  2970.                 if(!v->pquantizer)

  2971.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2972.             }

  2973.             if(!(subblkpat & (1 << (1 - j))) && !skip_block)

  2974.                 s->dsp.vc1_inv_trans_8x4(dst + j*4*linesize, linesize, block + off);

  2975.         }

  2976.         break;

  2977.     case TT_4X8:

  2978.         for(j = 0; j < 2; j++) {

  2979.             last = subblkpat & (1 << (1 - j));

  2980.             i = 0;

  2981.             off = j * 4;

  2982.             while (!last) {

  2983.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2984.                 i += skip;

  2985.                 if(i > 31)

  2986.                     break;

  2987.                 idx = v->zz_4x8[i++]+off;

  2988.                 block[idx] = value * scale;

  2989.                 if(!v->pquantizer)

  2990.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2991.             }

  2992.             if(!(subblkpat & (1 << (1 - j))) && !skip_block)

  2993.                 s->dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  2994.         }

  2995.         break;

  2996.     }

  2997.     return 0;

  2998. }

  2999. 

  3000. 

  3001. /** Decode one P-frame MB (in Simple/Main profile)

  3002.  */

  3003. static int vc1_decode_p_mb(VC1Context *v)

  3004. {

  3005.     MpegEncContext *s = &v->s;

  3006.     GetBitContext *gb = &s->gb;

  3007.     int i, j;

  3008.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3009.     int cbp; /* cbp decoding stuff */

  3010.     int mqdiff, mquant; /* MB quantization */

  3011.     int ttmb = v->ttfrm; /* MB Transform type */

  3012.     int status;

  3013. 

  3014.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3015.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3016.     int mb_has_coeffs = 1; /* last_flag */

  3017.     int dmv_x, dmv_y; /* Differential MV components */

  3018.     int index, index1; /* LUT indices */

  3019.     int val, sign; /* temp values */

  3020.     int first_block = 1;

  3021.     int dst_idx, off;

  3022.     int skipped, fourmv;

  3023. 

  3024.     mquant = v->pq; /* Loosy initialization */

  3025. 

  3026.     if (v->mv_type_is_raw)

  3027.         fourmv = get_bits1(gb);

  3028.     else

  3029.         fourmv = v->mv_type_mb_plane[mb_pos];

  3030.     if (v->skip_is_raw)

  3031.         skipped = get_bits1(gb);

  3032.     else

  3033.         skipped = v->s.mbskip_table[mb_pos];

  3034. 

  3035.     s->dsp.clear_blocks(s->block[0]);

  3036. 

  3037.     if (!fourmv) /* 1MV mode */

  3038.     {

  3039.         if (!skipped)

  3040.         {

  3041.             GET_MVDATA(dmv_x, dmv_y);

  3042. 

  3043.             if (s->mb_intra) {

  3044.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3045.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3046.             }

  3047.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3048.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3049. 

  3050.             /* FIXME Set DC val for inter block ? */

  3051.             if (s->mb_intra && !mb_has_coeffs)

  3052.             {

  3053.                 GET_MQUANT();

  3054.                 s->ac_pred = get_bits1(gb);

  3055.                 cbp = 0;

  3056.             }

  3057.             else if (mb_has_coeffs)

  3058.             {

  3059.                 if (s->mb_intra) s->ac_pred = get_bits1(gb);

  3060.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3061.                 GET_MQUANT();

  3062.             }

  3063.             else

  3064.             {

  3065.                 mquant = v->pq;

  3066.                 cbp = 0;

  3067.             }

  3068.             s->current_picture.qscale_table[mb_pos] = mquant;

  3069. 

  3070.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3071.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3072.                                 VC1_TTMB_VLC_BITS, 2);

  3073.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3074.             dst_idx = 0;

  3075.             for (i=0; i<6; i++)

  3076.             {

  3077.                 s->dc_val[0][s->block_index[i]] = 0;

  3078.                 dst_idx += i >> 2;

  3079.                 val = ((cbp >> (5 - i)) & 1);

  3080.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3081.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3082.                 if(s->mb_intra) {

  3083.                     /* check if prediction blocks A and C are available */

  3084.                     v->a_avail = v->c_avail = 0;

  3085.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3086.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3087.                     if(i == 1 || i == 3 || s->mb_x)

  3088.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3089. 

  3090.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3091.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3092.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3093.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3094.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3095.                     if(v->pq >= 9 && v->overlap) {

  3096.                         if(v->c_avail)

  3097.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3098.                         if(v->a_avail)

  3099.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3100.                     }

  3101.                 } else if(val) {

  3102.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY));

  3103.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3104.                     first_block = 0;

  3105.                 }

  3106.             }

  3107.         }

  3108.         else //Skipped

  3109.         {

  3110.             s->mb_intra = 0;

  3111.             for(i = 0; i < 6; i++) {

  3112.                 v->mb_type[0][s->block_index[i]] = 0;

  3113.                 s->dc_val[0][s->block_index[i]] = 0;

  3114.             }

  3115.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3116.             s->current_picture.qscale_table[mb_pos] = 0;

  3117.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3118.             vc1_mc_1mv(v, 0);

  3119.             return 0;

  3120.         }

  3121.     } //1MV mode

  3122.     else //4MV mode

  3123.     {

  3124.         if (!skipped /* unskipped MB */)

  3125.         {

  3126.             int intra_count = 0, coded_inter = 0;

  3127.             int is_intra[6], is_coded[6];

  3128.             /* Get CBPCY */

  3129.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3130.             for (i=0; i<6; i++)

  3131.             {

  3132.                 val = ((cbp >> (5 - i)) & 1);

  3133.                 s->dc_val[0][s->block_index[i]] = 0;

  3134.                 s->mb_intra = 0;

  3135.                 if(i < 4) {

  3136.                     dmv_x = dmv_y = 0;

  3137.                     s->mb_intra = 0;

  3138.                     mb_has_coeffs = 0;

  3139.                     if(val) {

  3140.                         GET_MVDATA(dmv_x, dmv_y);

  3141.                     }

  3142.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3143.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3144.                     intra_count += s->mb_intra;

  3145.                     is_intra[i] = s->mb_intra;

  3146.                     is_coded[i] = mb_has_coeffs;

  3147.                 }

  3148.                 if(i&4){

  3149.                     is_intra[i] = (intra_count >= 3);

  3150.                     is_coded[i] = val;

  3151.                 }

  3152.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3153.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3154.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3155.             }

  3156.             // if there are no coded blocks then don't do anything more

  3157.             if(!intra_count && !coded_inter) return 0;

  3158.             dst_idx = 0;

  3159.             GET_MQUANT();

  3160.             s->current_picture.qscale_table[mb_pos] = mquant;

  3161.             /* test if block is intra and has pred */

  3162.             {

  3163.                 int intrapred = 0;

  3164.                 for(i=0; i<6; i++)

  3165.                     if(is_intra[i]) {

  3166.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3167.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3168.                             intrapred = 1;

  3169.                             break;

  3170.                         }

  3171.                     }

  3172.                 if(intrapred)s->ac_pred = get_bits1(gb);

  3173.                 else s->ac_pred = 0;

  3174.             }

  3175.             if (!v->ttmbf && coded_inter)

  3176.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3177.             for (i=0; i<6; i++)

  3178.             {

  3179.                 dst_idx += i >> 2;

  3180.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3181.                 s->mb_intra = is_intra[i];

  3182.                 if (is_intra[i]) {

  3183.                     /* check if prediction blocks A and C are available */

  3184.                     v->a_avail = v->c_avail = 0;

  3185.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3186.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3187.                     if(i == 1 || i == 3 || s->mb_x)

  3188.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3189. 

  3190.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3191.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3192.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3193.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3194.                     s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3195.                     if(v->pq >= 9 && v->overlap) {

  3196.                         if(v->c_avail)

  3197.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3198.                         if(v->a_avail)

  3199.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3200.                     }

  3201.                 } else if(is_coded[i]) {

  3202.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY));

  3203.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3204.                     first_block = 0;

  3205.                 }

  3206.             }

  3207.             return status;

  3208.         }

  3209.         else //Skipped MB

  3210.         {

  3211.             s->mb_intra = 0;

  3212.             s->current_picture.qscale_table[mb_pos] = 0;

  3213.             for (i=0; i<6; i++) {

  3214.                 v->mb_type[0][s->block_index[i]] = 0;

  3215.                 s->dc_val[0][s->block_index[i]] = 0;

  3216.             }

  3217.             for (i=0; i<4; i++)

  3218.             {

  3219.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3220.                 vc1_mc_4mv_luma(v, i);

  3221.             }

  3222.             vc1_mc_4mv_chroma(v);

  3223.             s->current_picture.qscale_table[mb_pos] = 0;

  3224.             return 0;

  3225.         }

  3226.     }

  3227. 

  3228.     /* Should never happen */

  3229.     return -1;

  3230. }

  3231. 

  3232. /** Decode one B-frame MB (in Main profile)

  3233.  */

  3234. static void vc1_decode_b_mb(VC1Context *v)

  3235. {

  3236.     MpegEncContext *s = &v->s;

  3237.     GetBitContext *gb = &s->gb;

  3238.     int i, j;

  3239.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3240.     int cbp = 0; /* cbp decoding stuff */

  3241.     int mqdiff, mquant; /* MB quantization */

  3242.     int ttmb = v->ttfrm; /* MB Transform type */

  3243. 

  3244.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3245.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3246.     int mb_has_coeffs = 0; /* last_flag */

  3247.     int index, index1; /* LUT indices */

  3248.     int val, sign; /* temp values */

  3249.     int first_block = 1;

  3250.     int dst_idx, off;

  3251.     int skipped, direct;

  3252.     int dmv_x[2], dmv_y[2];

  3253.     int bmvtype = BMV_TYPE_BACKWARD;

  3254. 

  3255.     mquant = v->pq; /* Loosy initialization */

  3256.     s->mb_intra = 0;

  3257. 

  3258.     if (v->dmb_is_raw)

  3259.         direct = get_bits1(gb);

  3260.     else

  3261.         direct = v->direct_mb_plane[mb_pos];

  3262.     if (v->skip_is_raw)

  3263.         skipped = get_bits1(gb);

  3264.     else

  3265.         skipped = v->s.mbskip_table[mb_pos];

  3266. 

  3267.     s->dsp.clear_blocks(s->block[0]);

  3268.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3269.     for(i = 0; i < 6; i++) {

  3270.         v->mb_type[0][s->block_index[i]] = 0;

  3271.         s->dc_val[0][s->block_index[i]] = 0;

  3272.     }

  3273.     s->current_picture.qscale_table[mb_pos] = 0;

  3274. 

  3275.     if (!direct) {

  3276.         if (!skipped) {

  3277.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3278.             dmv_x[1] = dmv_x[0];

  3279.             dmv_y[1] = dmv_y[0];

  3280.         }

  3281.         if(skipped || !s->mb_intra) {

  3282.             bmvtype = decode012(gb);

  3283.             switch(bmvtype) {

  3284.             case 0:

  3285.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3286.                 break;

  3287.             case 1:

  3288.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3289.                 break;

  3290.             case 2:

  3291.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3292.                 dmv_x[0] = dmv_y[0] = 0;

  3293.             }

  3294.         }

  3295.     }

  3296.     for(i = 0; i < 6; i++)

  3297.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3298. 

  3299.     if (skipped) {

  3300.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3301.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3302.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3303.         return;

  3304.     }

  3305.     if (direct) {

  3306.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3307.         GET_MQUANT();

  3308.         s->mb_intra = 0;

  3309.         mb_has_coeffs = 0;

  3310.         s->current_picture.qscale_table[mb_pos] = mquant;

  3311.         if(!v->ttmbf)

  3312.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3313.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3314.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3315.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3316.     } else {

  3317.         if(!mb_has_coeffs && !s->mb_intra) {

  3318.             /* no coded blocks - effectively skipped */

  3319.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3320.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3321.             return;

  3322.         }

  3323.         if(s->mb_intra && !mb_has_coeffs) {

  3324.             GET_MQUANT();

  3325.             s->current_picture.qscale_table[mb_pos] = mquant;

  3326.             s->ac_pred = get_bits1(gb);

  3327.             cbp = 0;

  3328.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3329.         } else {

  3330.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3331.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3332.                 if(!mb_has_coeffs) {

  3333.                     /* interpolated skipped block */

  3334.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3335.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3336.                     return;

  3337.                 }

  3338.             }

  3339.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3340.             if(!s->mb_intra) {

  3341.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3342.             }

  3343.             if(s->mb_intra)

  3344.                 s->ac_pred = get_bits1(gb);

  3345.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3346.             GET_MQUANT();

  3347.             s->current_picture.qscale_table[mb_pos] = mquant;

  3348.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3349.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3350.         }

  3351.     }

  3352.     dst_idx = 0;

  3353.     for (i=0; i<6; i++)

  3354.     {

  3355.         s->dc_val[0][s->block_index[i]] = 0;

  3356.         dst_idx += i >> 2;

  3357.         val = ((cbp >> (5 - i)) & 1);

  3358.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3359.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3360.         if(s->mb_intra) {

  3361.             /* check if prediction blocks A and C are available */

  3362.             v->a_avail = v->c_avail = 0;

  3363.             if(i == 2 || i == 3 || !s->first_slice_line)

  3364.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3365.             if(i == 1 || i == 3 || s->mb_x)

  3366.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3367. 

  3368.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3369.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3370.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3371.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3372.             s->dsp.put_signed_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3373.         } else if(val) {

  3374.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block, s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize, (i&4) && (s->flags & CODEC_FLAG_GRAY));

  3375.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3376.             first_block = 0;

  3377.         }

  3378.     }

  3379. }

  3380. 

  3381. /** Decode blocks of I-frame

  3382.  */

  3383. static void vc1_decode_i_blocks(VC1Context *v)

  3384. {

  3385.     int k, j;

  3386.     MpegEncContext *s = &v->s;

  3387.     int cbp, val;

  3388.     uint8_t *coded_val;

  3389.     int mb_pos;

  3390. 

  3391.     /* select codingmode used for VLC tables selection */

  3392.     switch(v->y_ac_table_index){

  3393.     case 0:

  3394.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3395.         break;

  3396.     case 1:

  3397.         v->codingset = CS_HIGH_MOT_INTRA;

  3398.         break;

  3399.     case 2:

  3400.         v->codingset = CS_MID_RATE_INTRA;

  3401.         break;

  3402.     }

  3403. 

  3404.     switch(v->c_ac_table_index){

  3405.     case 0:

  3406.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3407.         break;

  3408.     case 1:

  3409.         v->codingset2 = CS_HIGH_MOT_INTER;

  3410.         break;

  3411.     case 2:

  3412.         v->codingset2 = CS_MID_RATE_INTER;

  3413.         break;

  3414.     }

  3415. 

  3416.     /* Set DC scale - y and c use the same */

  3417.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3418.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3419. 

  3420.     //do frame decode

  3421.     s->mb_x = s->mb_y = 0;

  3422.     s->mb_intra = 1;

  3423.     s->first_slice_line = 1;

  3424.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3425.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3426.             ff_init_block_index(s);

  3427.             ff_update_block_index(s);

  3428.             s->dsp.clear_blocks(s->block[0]);

  3429.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3430.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3431.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3432.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3433.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3434. 

  3435.             // do actual MB decoding and displaying

  3436.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3437.             v->s.ac_pred = get_bits1(&v->s.gb);

  3438. 

  3439.             for(k = 0; k < 6; k++) {

  3440.                 val = ((cbp >> (5 - k)) & 1);

  3441. 

  3442.                 if (k < 4) {

  3443.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3444.                     val = val ^ pred;

  3445.                     *coded_val = val;

  3446.                 }

  3447.                 cbp |= val << (5 - k);

  3448. 

  3449.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3450. 

  3451.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3452.                 if(v->pq >= 9 && v->overlap) {

  3453.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3454.                 }

  3455.             }

  3456. 

  3457.             vc1_put_block(v, s->block);

  3458.             if(v->pq >= 9 && v->overlap) {

  3459.                 if(s->mb_x) {

  3460.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3461.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3462.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3463.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3464.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3465.                     }

  3466.                 }

  3467.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3468.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3469.                 if(!s->first_slice_line) {

  3470.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3471.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3472.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3473.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3474.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3475.                     }

  3476.                 }

  3477.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3478.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3479.             }

  3480. 

  3481.             if(get_bits_count(&s->gb) > v->bits) {

  3482.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3483.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3484.                 return;

  3485.             }

  3486.         }

  3487.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3488.         s->first_slice_line = 0;

  3489.     }

  3490.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3491. }

  3492. 

  3493. /** Decode blocks of I-frame for advanced profile

  3494.  */

  3495. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3496. {

  3497.     int k, j;

  3498.     MpegEncContext *s = &v->s;

  3499.     int cbp, val;

  3500.     uint8_t *coded_val;

  3501.     int mb_pos;

  3502.     int mquant = v->pq;

  3503.     int mqdiff;

  3504.     int overlap;

  3505.     GetBitContext *gb = &s->gb;

  3506. 

  3507.     /* select codingmode used for VLC tables selection */

  3508.     switch(v->y_ac_table_index){

  3509.     case 0:

  3510.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3511.         break;

  3512.     case 1:

  3513.         v->codingset = CS_HIGH_MOT_INTRA;

  3514.         break;

  3515.     case 2:

  3516.         v->codingset = CS_MID_RATE_INTRA;

  3517.         break;

  3518.     }

  3519. 

  3520.     switch(v->c_ac_table_index){

  3521.     case 0:

  3522.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3523.         break;

  3524.     case 1:

  3525.         v->codingset2 = CS_HIGH_MOT_INTER;

  3526.         break;

  3527.     case 2:

  3528.         v->codingset2 = CS_MID_RATE_INTER;

  3529.         break;

  3530.     }

  3531. 

  3532.     //do frame decode

  3533.     s->mb_x = s->mb_y = 0;

  3534.     s->mb_intra = 1;

  3535.     s->first_slice_line = 1;

  3536.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3537.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3538.             ff_init_block_index(s);

  3539.             ff_update_block_index(s);

  3540.             s->dsp.clear_blocks(s->block[0]);

  3541.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3542.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3543.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3544.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3545. 

  3546.             // do actual MB decoding and displaying

  3547.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3548.             if(v->acpred_is_raw)

  3549.                 v->s.ac_pred = get_bits1(&v->s.gb);

  3550.             else

  3551.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3552. 

  3553.             if(v->condover == CONDOVER_SELECT) {

  3554.                 if(v->overflg_is_raw)

  3555.                     overlap = get_bits1(&v->s.gb);

  3556.                 else

  3557.                     overlap = v->over_flags_plane[mb_pos];

  3558.             } else

  3559.                 overlap = (v->condover == CONDOVER_ALL);

  3560. 

  3561.             GET_MQUANT();

  3562. 

  3563.             s->current_picture.qscale_table[mb_pos] = mquant;

  3564.             /* Set DC scale - y and c use the same */

  3565.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3566.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3567. 

  3568.             for(k = 0; k < 6; k++) {

  3569.                 val = ((cbp >> (5 - k)) & 1);

  3570. 

  3571.                 if (k < 4) {

  3572.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3573.                     val = val ^ pred;

  3574.                     *coded_val = val;

  3575.                 }

  3576.                 cbp |= val << (5 - k);

  3577. 

  3578.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3579.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3580. 

  3581.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3582. 

  3583.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3584.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3585.             }

  3586. 

  3587.             vc1_put_block(v, s->block);

  3588.             if(overlap) {

  3589.                 if(s->mb_x) {

  3590.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3591.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3592.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3593.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3594.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3595.                     }

  3596.                 }

  3597.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3598.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3599.                 if(!s->first_slice_line) {

  3600.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3601.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3602.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3603.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3604.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3605.                     }

  3606.                 }

  3607.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3608.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3609.             }

  3610. 

  3611.             if(get_bits_count(&s->gb) > v->bits) {

  3612.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3613.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3614.                 return;

  3615.             }

  3616.         }

  3617.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3618.         s->first_slice_line = 0;

  3619.     }

  3620.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3621. }

  3622. 

  3623. static void vc1_decode_p_blocks(VC1Context *v)

  3624. {

  3625.     MpegEncContext *s = &v->s;

  3626. 

  3627.     /* select codingmode used for VLC tables selection */

  3628.     switch(v->c_ac_table_index){

  3629.     case 0:

  3630.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3631.         break;

  3632.     case 1:

  3633.         v->codingset = CS_HIGH_MOT_INTRA;

  3634.         break;

  3635.     case 2:

  3636.         v->codingset = CS_MID_RATE_INTRA;

  3637.         break;

  3638.     }

  3639. 

  3640.     switch(v->c_ac_table_index){

  3641.     case 0:

  3642.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3643.         break;

  3644.     case 1:

  3645.         v->codingset2 = CS_HIGH_MOT_INTER;

  3646.         break;

  3647.     case 2:

  3648.         v->codingset2 = CS_MID_RATE_INTER;

  3649.         break;

  3650.     }

  3651. 

  3652.     s->first_slice_line = 1;

  3653.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3654.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3655.             ff_init_block_index(s);

  3656.             ff_update_block_index(s);

  3657.             s->dsp.clear_blocks(s->block[0]);

  3658. 

  3659.             vc1_decode_p_mb(v);

  3660.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3661.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3662.                 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);

  3663.                 return;

  3664.             }

  3665.         }

  3666.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3667.         s->first_slice_line = 0;

  3668.     }

  3669.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3670. }

  3671. 

  3672. static void vc1_decode_b_blocks(VC1Context *v)

  3673. {

  3674.     MpegEncContext *s = &v->s;

  3675. 

  3676.     /* select codingmode used for VLC tables selection */

  3677.     switch(v->c_ac_table_index){

  3678.     case 0:

  3679.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3680.         break;

  3681.     case 1:

  3682.         v->codingset = CS_HIGH_MOT_INTRA;

  3683.         break;

  3684.     case 2:

  3685.         v->codingset = CS_MID_RATE_INTRA;

  3686.         break;

  3687.     }

  3688. 

  3689.     switch(v->c_ac_table_index){

  3690.     case 0:

  3691.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3692.         break;

  3693.     case 1:

  3694.         v->codingset2 = CS_HIGH_MOT_INTER;

  3695.         break;

  3696.     case 2:

  3697.         v->codingset2 = CS_MID_RATE_INTER;

  3698.         break;

  3699.     }

  3700. 

  3701.     s->first_slice_line = 1;

  3702.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3703.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3704.             ff_init_block_index(s);

  3705.             ff_update_block_index(s);

  3706.             s->dsp.clear_blocks(s->block[0]);

  3707. 

  3708.             vc1_decode_b_mb(v);

  3709.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3710.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3711.                 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);

  3712.                 return;

  3713.             }

  3714.         }

  3715.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3716.         s->first_slice_line = 0;

  3717.     }

  3718.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3719. }

  3720. 

  3721. static void vc1_decode_skip_blocks(VC1Context *v)

  3722. {

  3723.     MpegEncContext *s = &v->s;

  3724. 

  3725.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3726.     s->first_slice_line = 1;

  3727.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3728.         s->mb_x = 0;

  3729.         ff_init_block_index(s);

  3730.         ff_update_block_index(s);

  3731.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  3732.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3733.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3734.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3735.         s->first_slice_line = 0;

  3736.     }

  3737.     s->pict_type = P_TYPE;

  3738. }

  3739. 

  3740. static void vc1_decode_blocks(VC1Context *v)

  3741. {

  3742. 

  3743.     v->s.esc3_level_length = 0;

  3744.     if(v->x8_type){

  3745.         ff_intrax8_decode_picture(&v->x8, 2*v->pq+v->halfpq, v->pq*(!v->pquantizer) );

  3746.     }else{

  3747. 

  3748.         switch(v->s.pict_type) {

  3749.         case I_TYPE:

  3750.             if(v->profile == PROFILE_ADVANCED)

  3751.                 vc1_decode_i_blocks_adv(v);

  3752.             else

  3753.                 vc1_decode_i_blocks(v);

  3754.             break;

  3755.         case P_TYPE:

  3756.             if(v->p_frame_skipped)

  3757.                 vc1_decode_skip_blocks(v);

  3758.             else

  3759.                 vc1_decode_p_blocks(v);

  3760.             break;

  3761.         case B_TYPE:

  3762.             if(v->bi_type){

  3763.                 if(v->profile == PROFILE_ADVANCED)

  3764.                     vc1_decode_i_blocks_adv(v);

  3765.                 else

  3766.                     vc1_decode_i_blocks(v);

  3767.             }else

  3768.                 vc1_decode_b_blocks(v);

  3769.             break;

  3770.         }

  3771.     }

  3772. }

  3773. 

  3774. /** Find VC-1 marker in buffer

  3775.  * @return position where next marker starts or end of buffer if no marker found

  3776.  */

  3777. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  3778. {

  3779.     uint32_t mrk = 0xFFFFFFFF;

  3780. 

  3781.     if(end-src < 4) return end;

  3782.     while(src < end){

  3783.         mrk = (mrk << 8) | *src++;

  3784.         if(IS_MARKER(mrk))

  3785.             return src-4;

  3786.     }

  3787.     return end;

  3788. }

  3789. 

  3790. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  3791. {

  3792.     int dsize = 0, i;

  3793. 

  3794.     if(size < 4){

  3795.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  3796.         return size;

  3797.     }

  3798.     for(i = 0; i < size; i++, src++) {

  3799.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  3800.             dst[dsize++] = src[1];

  3801.             src++;

  3802.             i++;

  3803.         } else

  3804.             dst[dsize++] = *src;

  3805.     }

  3806.     return dsize;

  3807. }

  3808. 

  3809. /** Initialize a VC1/WMV3 decoder

  3810.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3811.  * @todo TODO: Decypher remaining bits in extra_data

  3812.  */

  3813. static int vc1_decode_init(AVCodecContext *avctx)

  3814. {

  3815.     VC1Context *v = avctx->priv_data;

  3816.     MpegEncContext *s = &v->s;

  3817.     GetBitContext gb;

  3818. 

  3819.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3820.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3821.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3822.     else

  3823.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3824.     v->s.avctx = avctx;

  3825.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3826.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3827. 

  3828.     if(avctx->idct_algo==FF_IDCT_AUTO){

  3829.         avctx->idct_algo=FF_IDCT_WMV2;

  3830.     }

  3831. 

  3832.     if(ff_h263_decode_init(avctx) < 0)

  3833.         return -1;

  3834.     if (vc1_init_common(v) < 0) return -1;

  3835. 

  3836.     avctx->coded_width = avctx->width;

  3837.     avctx->coded_height = avctx->height;

  3838.     if (avctx->codec_id == CODEC_ID_WMV3)

  3839.     {

  3840.         int count = 0;

  3841. 

  3842.         // looks like WMV3 has a sequence header stored in the extradata

  3843.         // advanced sequence header may be before the first frame

  3844.         // the last byte of the extradata is a version number, 1 for the

  3845.         // samples we can decode

  3846. 

  3847.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3848. 

  3849.         if (decode_sequence_header(avctx, &gb) < 0)

  3850.           return -1;

  3851. 

  3852.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3853.         if (count>0)

  3854.         {

  3855.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3856.                    count, get_bits(&gb, count));

  3857.         }

  3858.         else if (count < 0)

  3859.         {

  3860.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3861.         }

  3862.     } else { // VC1/WVC1

  3863.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  3864.         uint8_t *next; int size, buf2_size;

  3865.         uint8_t *buf2 = NULL;

  3866.         int seq_inited = 0, ep_inited = 0;

  3867. 

  3868.         if(avctx->extradata_size < 16) {

  3869.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  3870.             return -1;

  3871.         }

  3872. 

  3873.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3874.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  3875.         next = start;

  3876.         for(; next < end; start = next){

  3877.             next = find_next_marker(start + 4, end);

  3878.             size = next - start - 4;

  3879.             if(size <= 0) continue;

  3880.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  3881.             init_get_bits(&gb, buf2, buf2_size * 8);

  3882.             switch(AV_RB32(start)){

  3883.             case VC1_CODE_SEQHDR:

  3884.                 if(decode_sequence_header(avctx, &gb) < 0){

  3885.                     av_free(buf2);

  3886.                     return -1;

  3887.                 }

  3888.                 seq_inited = 1;

  3889.                 break;

  3890.             case VC1_CODE_ENTRYPOINT:

  3891.                 if(decode_entry_point(avctx, &gb) < 0){

  3892.                     av_free(buf2);

  3893.                     return -1;

  3894.                 }

  3895.                 ep_inited = 1;

  3896.                 break;

  3897.             }

  3898.         }

  3899.         av_free(buf2);

  3900.         if(!seq_inited || !ep_inited){

  3901.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  3902.             return -1;

  3903.         }

  3904.     }

  3905.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3906.     s->low_delay = !avctx->has_b_frames;

  3907. 

  3908.     s->mb_width = (avctx->coded_width+15)>>4;

  3909.     s->mb_height = (avctx->coded_height+15)>>4;

  3910. 

  3911.     /* Allocate mb bitplanes */

  3912.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3913.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3914.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  3915.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  3916. 

  3917.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3918.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3919.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3920.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3921.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3922. 

  3923.     /* Init coded blocks info */

  3924.     if (v->profile == PROFILE_ADVANCED)

  3925.     {

  3926. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3927. //            return -1;

  3928. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3929. //            return -1;

  3930.     }

  3931. 

  3932.     ff_intrax8_common_init(&v->x8,s);

  3933.     return 0;

  3934. }

  3935. 

  3936. 

  3937. /** Decode a VC1/WMV3 frame

  3938.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3939.  */

  3940. static int vc1_decode_frame(AVCodecContext *avctx,

  3941.                             void *data, int *data_size,

  3942.                             uint8_t *buf, int buf_size)

  3943. {

  3944.     VC1Context *v = avctx->priv_data;

  3945.     MpegEncContext *s = &v->s;

  3946.     AVFrame *pict = data;

  3947.     uint8_t *buf2 = NULL;

  3948. 

  3949.     /* no supplementary picture */

  3950.     if (buf_size == 0) {

  3951.         /* special case for last picture */

  3952.         if (s->low_delay==0 && s->next_picture_ptr) {

  3953.             *pict= *(AVFrame*)s->next_picture_ptr;

  3954.             s->next_picture_ptr= NULL;

  3955. 

  3956.             *data_size = sizeof(AVFrame);

  3957.         }

  3958. 

  3959.         return 0;

  3960.     }

  3961. 

  3962.     /* We need to set current_picture_ptr before reading the header,

  3963.      * otherwise we cannot store anything in there. */

  3964.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  3965.         int i= ff_find_unused_picture(s, 0);

  3966.         s->current_picture_ptr= &s->picture[i];

  3967.     }

  3968. 

  3969.     //for advanced profile we may need to parse and unescape data

  3970.     if (avctx->codec_id == CODEC_ID_VC1) {

  3971.         int buf_size2 = 0;

  3972.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3973. 

  3974.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  3975.             uint8_t *start, *end, *next;

  3976.             int size;

  3977. 

  3978.             next = buf;

  3979.             for(start = buf, end = buf + buf_size; next < end; start = next){

  3980.                 next = find_next_marker(start + 4, end);

  3981.                 size = next - start - 4;

  3982.                 if(size <= 0) continue;

  3983.                 switch(AV_RB32(start)){

  3984.                 case VC1_CODE_FRAME:

  3985.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  3986.                     break;

  3987.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  3988.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  3989.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  3990.                     decode_entry_point(avctx, &s->gb);

  3991.                     break;

  3992.                 case VC1_CODE_SLICE:

  3993.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  3994.                     av_free(buf2);

  3995.                     return -1;

  3996.                 }

  3997.             }

  3998.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  3999.             uint8_t *divider;

  4000. 

  4001.             divider = find_next_marker(buf, buf + buf_size);

  4002.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4003.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4004.                 return -1;

  4005.             }

  4006. 

  4007.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4008.             // TODO

  4009.             av_free(buf2);return -1;

  4010.         }else{

  4011.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4012.         }

  4013.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4014.     } else

  4015.         init_get_bits(&s->gb, buf, buf_size*8);

  4016.     // do parse frame header

  4017.     if(v->profile < PROFILE_ADVANCED) {

  4018.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4019.             av_free(buf2);

  4020.             return -1;

  4021.         }

  4022.     } else {

  4023.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4024.             av_free(buf2);

  4025.             return -1;

  4026.         }

  4027.     }

  4028. 

  4029.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4030.         av_free(buf2);

  4031.         return -1;

  4032.     }

  4033. 

  4034.     // for hurry_up==5

  4035.     s->current_picture.pict_type= s->pict_type;

  4036.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4037. 

  4038.     /* skip B-frames if we don't have reference frames */

  4039.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4040.         av_free(buf2);

  4041.         return -1;//buf_size;

  4042.     }

  4043.     /* skip b frames if we are in a hurry */

  4044.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4045.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4046.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4047.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4048.         av_free(buf2);

  4049.         return buf_size;

  4050.     }

  4051.     /* skip everything if we are in a hurry>=5 */

  4052.     if(avctx->hurry_up>=5) {

  4053.         av_free(buf2);

  4054.         return -1;//buf_size;

  4055.     }

  4056. 

  4057.     if(s->next_p_frame_damaged){

  4058.         if(s->pict_type==B_TYPE)

  4059.             return buf_size;

  4060.         else

  4061.             s->next_p_frame_damaged=0;

  4062.     }

  4063. 

  4064.     if(MPV_frame_start(s, avctx) < 0) {

  4065.         av_free(buf2);

  4066.         return -1;

  4067.     }

  4068. 

  4069.     s->me.qpel_put= s->dsp.put_qpel_pixels_tab;

  4070.     s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;

  4071. 

  4072.     ff_er_frame_start(s);

  4073. 

  4074.     v->bits = buf_size * 8;

  4075.     vc1_decode_blocks(v);

  4076. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4077. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4078. //      return -1;

  4079.     ff_er_frame_end(s);

  4080. 

  4081.     MPV_frame_end(s);

  4082. 

  4083. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4084. assert(s->current_picture.pict_type == s->pict_type);

  4085.     if (s->pict_type == B_TYPE || s->low_delay) {

  4086.         *pict= *(AVFrame*)s->current_picture_ptr;

  4087.     } else if (s->last_picture_ptr != NULL) {

  4088.         *pict= *(AVFrame*)s->last_picture_ptr;

  4089.     }

  4090. 

  4091.     if(s->last_picture_ptr || s->low_delay){

  4092.         *data_size = sizeof(AVFrame);

  4093.         ff_print_debug_info(s, pict);

  4094.     }

  4095. 

  4096.     /* Return the Picture timestamp as the frame number */

  4097.     /* we subtract 1 because it is added on utils.c     */

  4098.     avctx->frame_number = s->picture_number - 1;

  4099. 

  4100.     av_free(buf2);

  4101.     return buf_size;

  4102. }

  4103. 

  4104. 

  4105. /** Close a VC1/WMV3 decoder

  4106.  * @warning Initial try at using MpegEncContext stuff

  4107.  */

  4108. static int vc1_decode_end(AVCodecContext *avctx)

  4109. {

  4110.     VC1Context *v = avctx->priv_data;

  4111. 

  4112.     av_freep(&v->hrd_rate);

  4113.     av_freep(&v->hrd_buffer);

  4114.     MPV_common_end(&v->s);

  4115.     av_freep(&v->mv_type_mb_plane);

  4116.     av_freep(&v->direct_mb_plane);

  4117.     av_freep(&v->acpred_plane);

  4118.     av_freep(&v->over_flags_plane);

  4119.     av_freep(&v->mb_type_base);

  4120.     return 0;

  4121. }

  4122. 

  4123. 

  4124. AVCodec vc1_decoder = {

  4125.     "vc1",

  4126.     CODEC_TYPE_VIDEO,

  4127.     CODEC_ID_VC1,

  4128.     sizeof(VC1Context),

  4129.     vc1_decode_init,

  4130.     NULL,

  4131.     vc1_decode_end,

  4132.     vc1_decode_frame,

  4133.     CODEC_CAP_DELAY,

  4134.     NULL

  4135. };

  4136. 

  4137. AVCodec wmv3_decoder = {

  4138.     "wmv3",

  4139.     CODEC_TYPE_VIDEO,

  4140.     CODEC_ID_WMV3,

  4141.     sizeof(VC1Context),

  4142.     vc1_decode_init,

  4143.     NULL,

  4144.     vc1_decode_end,

  4145.     vc1_decode_frame,

  4146.     CODEC_CAP_DELAY,

  4147.     NULL

  4148. };