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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. 

  37. #undef NDEBUG

  38. #include <assert.h>

  39. 

  40. #define MB_INTRA_VLC_BITS 9

  41. #define DC_VLC_BITS 9

  42. #define AC_VLC_BITS 9

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

  44. 

  45. 

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

  47.     if (get_bits1(gb))

  48.         return 0;

  49.     else

  50.         return 2 - get_bits1(gb);

  51. }

  52. 

  53. /**

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

  55.  * @param v The VC1Context to initialize

  56.  * @return Status

  57.  */

  58. static int vc1_init_common(VC1Context *v)

  59. {

  60.     static int done = 0;

  61.     int i = 0;

  62. 

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

  64. 

  65.     /* VLC tables */

  66.     if(!done)

  67.     {

  68.         done = 1;

  69.         init_vlc(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  70.                  ff_vc1_bfraction_bits, 1, 1,

  71.                  ff_vc1_bfraction_codes, 1, 1, 1);

  72.         init_vlc(&ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  73.                  ff_vc1_norm2_bits, 1, 1,

  74.                  ff_vc1_norm2_codes, 1, 1, 1);

  75.         init_vlc(&ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  76.                  ff_vc1_norm6_bits, 1, 1,

  77.                  ff_vc1_norm6_codes, 2, 2, 1);

  78.         init_vlc(&ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  79.                  ff_vc1_imode_bits, 1, 1,

  80.                  ff_vc1_imode_codes, 1, 1, 1);

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

  82.         {

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

  84.                      ff_vc1_ttmb_bits[i], 1, 1,

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

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

  87.                      ff_vc1_ttblk_bits[i], 1, 1,

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

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

  90.                      ff_vc1_subblkpat_bits[i], 1, 1,

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

  92.         }

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

  94.         {

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

  96.                      ff_vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  99.                      ff_vc1_cbpcy_p_bits[i], 1, 1,

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

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

  102.                      ff_vc1_mv_diff_bits[i], 1, 1,

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

  104.         }

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

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

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

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

  109.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  112.     }

  113. 

  114.     /* Other defaults */

  115.     v->pq = -1;

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

  117. 

  118.     return 0;

  119. }

  120. 

  121. /***********************************************************************/

  122. /**

  123.  * @defgroup bitplane VC9 Bitplane decoding

  124.  * @see 8.7, p56

  125.  * @{

  126.  */

  127. 

  128. /** @addtogroup bitplane

  129.  * Imode types

  130.  * @{

  131.  */

  132. enum Imode {

  133.     IMODE_RAW,

  134.     IMODE_NORM2,

  135.     IMODE_DIFF2,

  136.     IMODE_NORM6,

  137.     IMODE_DIFF6,

  138.     IMODE_ROWSKIP,

  139.     IMODE_COLSKIP

  140. };

  141. /** @} */ //imode defines

  142. 

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

  144.  * @param plane Buffer to store decoded bits

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

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

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

  148.  */

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

  150.     int x, y;

  151. 

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

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

  154.             memset(plane, 0, width);

  155.         else

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

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

  158.         plane += stride;

  159.     }

  160. }

  161. 

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

  163.  * @param plane Buffer to store decoded bits

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

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

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

  167.  * @todo FIXME: Optimize

  168.  */

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

  170.     int x, y;

  171. 

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

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

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

  175.                 plane[y*stride] = 0;

  176.         else

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

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

  179.         plane ++;

  180.     }

  181. }

  182. 

  183. /** Decode a bitplane's bits

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

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

  186.  * @return Status

  187.  * @todo FIXME: Optimize

  188.  */

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

  190. {

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

  192. 

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

  194.     uint8_t invert, *planep = data;

  195.     int width, height, stride;

  196. 

  197.     width = v->s.mb_width;

  198.     height = v->s.mb_height;

  199.     stride = v->s.mb_stride;

  200.     invert = get_bits1(gb);

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

  202. 

  203.     *raw_flag = 0;

  204.     switch (imode)

  205.     {

  206.     case IMODE_RAW:

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

  208.         *raw_flag = 1; //invert ignored

  209.         return invert;

  210.     case IMODE_DIFF2:

  211.     case IMODE_NORM2:

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

  213.         {

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

  215.             offset = 1;

  216.         }

  217.         else offset = 0;

  218.         // decode bitplane as one long line

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

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

  221.             *planep++ = code & 1;

  222.             offset++;

  223.             if(offset == width) {

  224.                 offset = 0;

  225.                 planep += stride - width;

  226.             }

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

  228.             offset++;

  229.             if(offset == width) {

  230.                 offset = 0;

  231.                 planep += stride - width;

  232.             }

  233.         }

  234.         break;

  235.     case IMODE_DIFF6:

  236.     case IMODE_NORM6:

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

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

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

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

  241.                     if(code < 0){

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

  243.                         return -1;

  244.                     }

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

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

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

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

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

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

  251.                 }

  252.                 planep += stride * 3;

  253.             }

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

  255.         } else { // 3x2

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

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

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

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

  260.                     if(code < 0){

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

  262.                         return -1;

  263.                     }

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

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

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

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

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

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

  270.                 }

  271.                 planep += stride * 2;

  272.             }

  273.             x = width % 3;

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

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

  276.         }

  277.         break;

  278.     case IMODE_ROWSKIP:

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

  280.         break;

  281.     case IMODE_COLSKIP:

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

  283.         break;

  284.     default: break;

  285.     }

  286. 

  287.     /* Applying diff operator */

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

  289.     {

  290.         planep = data;

  291.         planep[0] ^= invert;

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

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

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

  295.         {

  296.             planep += stride;

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

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

  299.             {

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

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

  302.             }

  303.         }

  304.     }

  305.     else if (invert)

  306.     {

  307.         planep = data;

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

  309.     }

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

  311. }

  312. 

  313. /** @} */ //Bitplane group

  314. 

  315. /***********************************************************************/

  316. /** VOP Dquant decoding

  317.  * @param v VC-1 Context

  318.  */

  319. static int vop_dquant_decoding(VC1Context *v)

  320. {

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

  322.     int pqdiff;

  323. 

  324.     //variable size

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

  326.     {

  327.         pqdiff = get_bits(gb, 3);

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

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

  330.     }

  331.     else

  332.     {

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

  334.         if ( v->dquantfrm )

  335.         {

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

  337.             switch (v->dqprofile)

  338.             {

  339.             case DQPROFILE_SINGLE_EDGE:

  340.             case DQPROFILE_DOUBLE_EDGES:

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

  342.                 break;

  343.             case DQPROFILE_ALL_MBS:

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

  345.                 if(!v->dqbilevel)

  346.                     v->halfpq = 0;

  347.             default: break; //Forbidden ?

  348.             }

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

  350.             {

  351.                 pqdiff = get_bits(gb, 3);

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

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

  354.             }

  355.         }

  356.     }

  357.     return 0;

  358. }

  359. 

  360. /** Put block onto picture

  361.  */

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

  363. {

  364.     uint8_t *Y;

  365.     int ys, us, vs;

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

  367. 

  368.     if(v->rangeredfrm) {

  369.         int i, j, k;

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

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

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

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

  374. 

  375.     }

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

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

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

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

  380. 

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

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

  383.     Y += ys * 8;

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

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

  386. 

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

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

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

  390.     }

  391. }

  392. 

  393. /** Do motion compensation over 1 macroblock

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

  395.  */

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

  397. {

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

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

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

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

  402. 

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

  404. 

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

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

  407. 

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

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

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

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

  412.     }

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

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

  415.     if(v->fastuvmc) {

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

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

  418.     }

  419.     if(!dir) {

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

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

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

  423.     } else {

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

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

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

  427.     }

  428. 

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

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

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

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

  433. 

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

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

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

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

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

  439.     }else{

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

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

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

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

  444.     }

  445. 

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

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

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

  449. 

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

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

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

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

  454.     }

  455. 

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

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

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

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

  460. 

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

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

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

  464.         srcY = s->edge_emu_buffer;

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

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

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

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

  469.         srcU = uvbuf;

  470.         srcV = uvbuf + 16;

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

  472.         if(v->rangeredfrm) {

  473.             int i, j;

  474.             uint8_t *src, *src2;

  475. 

  476.             src = srcY;

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

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

  479.                 src += s->linesize;

  480.             }

  481.             src = srcU; src2 = srcV;

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

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

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

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

  486.                 }

  487.                 src += s->uvlinesize;

  488.                 src2 += s->uvlinesize;

  489.             }

  490.         }

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

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

  493.             int i, j;

  494.             uint8_t *src, *src2;

  495. 

  496.             src = srcY;

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

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

  499.                 src += s->linesize;

  500.             }

  501.             src = srcU; src2 = srcV;

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

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

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

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

  506.                 }

  507.                 src += s->uvlinesize;

  508.                 src2 += s->uvlinesize;

  509.             }

  510.         }

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

  512.     }

  513. 

  514.     if(s->mspel) {

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

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

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

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

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

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

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

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

  523. 

  524.         if(!v->rnd)

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

  526.         else

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

  528.     }

  529. 

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

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

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

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

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

  535.     if(!v->rnd){

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

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

  538.     }else{

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

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

  541.     }

  542. }

  543. 

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

  545.  */

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

  547. {

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

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

  550.     uint8_t *srcY;

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

  552.     int off;

  553. 

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

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

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

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

  558. 

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

  560. 

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

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

  563. 

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

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

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

  567.     }else{

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

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

  570.     }

  571. 

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

  573. 

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

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

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

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

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

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

  580.         srcY = s->edge_emu_buffer;

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

  582.         if(v->rangeredfrm) {

  583.             int i, j;

  584.             uint8_t *src;

  585. 

  586.             src = srcY;

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

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

  589.                 src += s->linesize;

  590.             }

  591.         }

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

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

  594.             int i, j;

  595.             uint8_t *src;

  596. 

  597.             src = srcY;

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

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

  600.                 src += s->linesize;

  601.             }

  602.         }

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

  604.     }

  605. 

  606.     if(s->mspel) {

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

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

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

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

  611.         if(!v->rnd)

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

  613.         else

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

  615.     }

  616. }

  617. 

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

  619. {

  620.     if(a < b) {

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

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

  623.     } else {

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

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

  626.     }

  627. }

  628. 

  629. 

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

  631.  */

  632. static void vc1_mc_4mv_chroma(VC1Context *v)

  633. {

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

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

  636.     uint8_t *srcU, *srcV;

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

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

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

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

  641. 

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

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

  644. 

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

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

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

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

  649.     }

  650. 

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

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

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

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

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

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

  657.         switch(idx) {

  658.         case 0x1:

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

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

  661.             break;

  662.         case 0x2:

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

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

  665.             break;

  666.         case 0x4:

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

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

  669.             break;

  670.         case 0x8:

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

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

  673.             break;

  674.         }

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

  676.         int t1 = 0, t2 = 0;

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

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

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

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

  681.     } else {

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

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

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

  685.     }

  686. 

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

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

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

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

  691.     if(v->fastuvmc) {

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

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

  694.     }

  695. 

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

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

  698. 

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

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

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

  702.     }else{

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

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

  705.     }

  706. 

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

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

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

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

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

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

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

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

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

  716.         srcU = s->edge_emu_buffer;

  717.         srcV = s->edge_emu_buffer + 16;

  718. 

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

  720.         if(v->rangeredfrm) {

  721.             int i, j;

  722.             uint8_t *src, *src2;

  723. 

  724.             src = srcU; src2 = srcV;

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

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

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

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

  729.                 }

  730.                 src += s->uvlinesize;

  731.                 src2 += s->uvlinesize;

  732.             }

  733.         }

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

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

  736.             int i, j;

  737.             uint8_t *src, *src2;

  738. 

  739.             src = srcU; src2 = srcV;

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

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

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

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

  744.                 }

  745.                 src += s->uvlinesize;

  746.                 src2 += s->uvlinesize;

  747.             }

  748.         }

  749.     }

  750. 

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

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

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

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

  755.     if(!v->rnd){

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

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

  758.     }else{

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

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

  761.     }

  762. }

  763. 

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

  765. 

  766. /**

  767.  * Decode Simple/Main Profiles sequence header

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

  769.  * @param avctx Codec context

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

  771.  * @return Status

  772.  */

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

  774. {

  775.     VC1Context *v = avctx->priv_data;

  776. 

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

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

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

  780.     {

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

  782.     }

  783. 

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

  785.     {

  786.         return decode_sequence_header_adv(v, gb);

  787.     }

  788.     else

  789.     {

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

  791.         if (v->res_sm)

  792.         {

  793.             av_log(avctx, AV_LOG_ERROR,

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

  795.             return -1;

  796.         }

  797.     }

  798. 

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

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

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

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

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

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

  805.     {

  806.         av_log(avctx, AV_LOG_ERROR,

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

  808.     }

  809. 

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

  811.     if (v->res_x8)

  812.     {

  813.         av_log(avctx, AV_LOG_ERROR,

  814.                "1 for reserved RES_X8 is forbidden\n");

  815.         //return -1;

  816.     }

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

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

  819.     if (!v->res_fasttx)

  820.     {

  821.         av_log(avctx, AV_LOG_ERROR,

  822.                "0 for reserved RES_FASTTX is forbidden\n");

  823.         //return -1;

  824.     }

  825. 

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

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

  828.     {

  829.         av_log(avctx, AV_LOG_ERROR,

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

  831.         return -1;

  832.     }

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

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

  835.     {

  836.         av_log(avctx, AV_LOG_ERROR,

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

  838.         return -1;

  839.     }

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

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

  842. 

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

  844.     if (v->res_transtab)

  845.     {

  846.         av_log(avctx, AV_LOG_ERROR,

  847.                "1 for reserved RES_TRANSTAB is forbidden\n");

  848.         return -1;

  849.     }

  850. 

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

  852. 

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

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

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

  856.     {

  857.         av_log(avctx, AV_LOG_INFO,

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

  859.     }

  860. 

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

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

  863. 

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

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

  866.     if (!v->res_rtm_flag)

  867.     {

  868. //            av_log(avctx, AV_LOG_ERROR,

  869. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  870.         av_log(avctx, AV_LOG_ERROR,

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

  872.         //return -1;

  873.     }

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

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

  876.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  885.                );

  886.     return 0;

  887. }

  888. 

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

  890. {

  891.     v->res_rtm_flag = 1;

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

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

  894.     {

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

  896.     }

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

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

  899.     {

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

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

  902.         return -1;

  903.     }

  904. 

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

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

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

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

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

  910. 

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

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

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

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

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

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

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

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

  919.     skip_bits1(gb); // reserved

  920. 

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

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

  923. 

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

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

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

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

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

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

  930.                v->tfcntrflag, v->finterpflag

  931.                );

  932. 

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

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

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

  936.         return -1;

  937.     }

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

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

  940.         int w, h, ar = 0;

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

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

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

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

  945.         if(get_bits1(gb))

  946.             ar = get_bits(gb, 4);

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

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

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

  950.             w = get_bits(gb, 8);

  951.             h = get_bits(gb, 8);

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

  953.         }

  954. 

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

  956.             if(get_bits1(gb)) {

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

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

  959.             } else {

  960.                 int nr, dr;

  961.                 nr = get_bits(gb, 8);

  962.                 dr = get_bits(gb, 4);

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

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

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

  966.                 }

  967.             }

  968.         }

  969. 

  970.         if(get_bits1(gb)){

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

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

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

  974.         }

  975.     }

  976. 

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

  978.     if(v->hrd_param_flag) {

  979.         int i;

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

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

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

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

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

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

  986.         }

  987.     }

  988.     return 0;

  989. }

  990. 

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

  992. {

  993.     VC1Context *v = avctx->priv_data;

  994.     int i, blink, clentry, refdist;

  995. 

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

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

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

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

  1000.     refdist = get_bits1(gb); // refdist flag

  1001.     v->s.loop_filter = get_bits1(gb);

  1002.     v->fastuvmc = get_bits1(gb);

  1003.     v->extended_mv = get_bits1(gb);

  1004.     v->dquant = get_bits(gb, 2);

  1005.     v->vstransform = get_bits1(gb);

  1006.     v->overlap = get_bits1(gb);

  1007.     v->quantizer_mode = get_bits(gb, 2);

  1008. 

  1009.     if(v->hrd_param_flag){

  1010.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1011.             skip_bits(gb, 8); //hrd_full[n]

  1012.         }

  1013.     }

  1014. 

  1015.     if(get_bits1(gb)){

  1016.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

  1017.         avctx->coded_height = (get_bits(gb, 12)+1)<<1;

  1018.     }

  1019.     if(v->extended_mv)

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

  1021.     if(get_bits1(gb)) {

  1022.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1023.         skip_bits(gb, 3); // Y range, ignored for now

  1024.     }

  1025.     if(get_bits1(gb)) {

  1026.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1027.         skip_bits(gb, 3); // UV range, ignored for now

  1028.     }

  1029. 

  1030.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1031.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1032.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1033.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1034.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1035.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1036. 

  1037.     return 0;

  1038. }

  1039. 

  1040. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1041. {

  1042.     int pqindex, lowquant, status;

  1043. 

  1044.     if(v->finterpflag) v->interpfrm = get_bits1(gb);

  1045.     skip_bits(gb, 2); //framecnt unused

  1046.     v->rangeredfrm = 0;

  1047.     if (v->rangered) v->rangeredfrm = get_bits1(gb);

  1048.     v->s.pict_type = get_bits1(gb);

  1049.     if (v->s.avctx->max_b_frames) {

  1050.         if (!v->s.pict_type) {

  1051.             if (get_bits1(gb)) v->s.pict_type = I_TYPE;

  1052.             else v->s.pict_type = B_TYPE;

  1053.         } else v->s.pict_type = P_TYPE;

  1054.     } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

  1055. 

  1056.     v->bi_type = 0;

  1057.     if(v->s.pict_type == B_TYPE) {

  1058.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1059.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1060.         if(v->bfraction == 0) {

  1061.             v->s.pict_type = BI_TYPE;

  1062.         }

  1063.     }

  1064.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1065.         skip_bits(gb, 7); // skip buffer fullness

  1066. 

  1067.     /* calculate RND */

  1068.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1069.         v->rnd = 1;

  1070.     if(v->s.pict_type == P_TYPE)

  1071.         v->rnd ^= 1;

  1072. 

  1073.     /* Quantizer stuff */

  1074.     pqindex = get_bits(gb, 5);

  1075.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1076.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1077.     else

  1078.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1079. 

  1080.     v->pquantizer = 1;

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

  1082.         v->pquantizer = pqindex < 9;

  1083.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1084.         v->pquantizer = 0;

  1085.     v->pqindex = pqindex;

  1086.     if (pqindex < 9) v->halfpq = get_bits1(gb);

  1087.     else v->halfpq = 0;

  1088.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1089.         v->pquantizer = get_bits1(gb);

  1090.     v->dquantfrm = 0;

  1091.     if (v->extended_mv == 1) v->mvrange = get_unary(gb, 0, 3);

  1092.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1093.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1094.     v->range_x = 1 << (v->k_x - 1);

  1095.     v->range_y = 1 << (v->k_y - 1);

  1096.     if (v->profile == PROFILE_ADVANCED)

  1097.     {

  1098.         if (v->postprocflag) v->postproc = get_bits1(gb);

  1099.     }

  1100.     else

  1101.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1102. 

  1103.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1104.         if(get_bits1(gb))return -1;

  1105.     }

  1106. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1107. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1108. 

  1109.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1110. 

  1111.     switch(v->s.pict_type) {

  1112.     case P_TYPE:

  1113.         if (v->pq < 5) v->tt_index = 0;

  1114.         else if(v->pq < 13) v->tt_index = 1;

  1115.         else v->tt_index = 2;

  1116. 

  1117.         lowquant = (v->pq > 12) ? 0 : 1;

  1118.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];

  1119.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1120.         {

  1121.             int scale, shift, i;

  1122.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];

  1123.             v->lumscale = get_bits(gb, 6);

  1124.             v->lumshift = get_bits(gb, 6);

  1125.             v->use_ic = 1;

  1126.             /* fill lookup tables for intensity compensation */

  1127.             if(!v->lumscale) {

  1128.                 scale = -64;

  1129.                 shift = (255 - v->lumshift * 2) << 6;

  1130.                 if(v->lumshift > 31)

  1131.                     shift += 128 << 6;

  1132.             } else {

  1133.                 scale = v->lumscale + 32;

  1134.                 if(v->lumshift > 31)

  1135.                     shift = (v->lumshift - 64) << 6;

  1136.                 else

  1137.                     shift = v->lumshift << 6;

  1138.             }

  1139.             for(i = 0; i < 256; i++) {

  1140.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1141.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1142.             }

  1143.         }

  1144.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1145.             v->s.quarter_sample = 0;

  1146.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1147.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1148.                 v->s.quarter_sample = 0;

  1149.             else

  1150.                 v->s.quarter_sample = 1;

  1151.         } else

  1152.             v->s.quarter_sample = 1;

  1153.         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));

  1154. 

  1155.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1156.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1157.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1158.         {

  1159.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1160.             if (status < 0) return -1;

  1161.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1162.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1163.         } else {

  1164.             v->mv_type_is_raw = 0;

  1165.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1166.         }

  1167.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1168.         if (status < 0) return -1;

  1169.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1170.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1171. 

  1172.         /* Hopefully this is correct for P frames */

  1173.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1174.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1175. 

  1176.         if (v->dquant)

  1177.         {

  1178.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1179.             vop_dquant_decoding(v);

  1180.         }

  1181. 

  1182.         v->ttfrm = 0; //FIXME Is that so ?

  1183.         if (v->vstransform)

  1184.         {

  1185.             v->ttmbf = get_bits1(gb);

  1186.             if (v->ttmbf)

  1187.             {

  1188.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1189.             }

  1190.         } else {

  1191.             v->ttmbf = 1;

  1192.             v->ttfrm = TT_8X8;

  1193.         }

  1194.         break;

  1195.     case B_TYPE:

  1196.         if (v->pq < 5) v->tt_index = 0;

  1197.         else if(v->pq < 13) v->tt_index = 1;

  1198.         else v->tt_index = 2;

  1199. 

  1200.         lowquant = (v->pq > 12) ? 0 : 1;

  1201.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1202.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1203.         v->s.mspel = v->s.quarter_sample;

  1204. 

  1205.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

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

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

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

  1209.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

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

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

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

  1213. 

  1214.         v->s.mv_table_index = get_bits(gb, 2);

  1215.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1216. 

  1217.         if (v->dquant)

  1218.         {

  1219.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1220.             vop_dquant_decoding(v);

  1221.         }

  1222. 

  1223.         v->ttfrm = 0;

  1224.         if (v->vstransform)

  1225.         {

  1226.             v->ttmbf = get_bits1(gb);

  1227.             if (v->ttmbf)

  1228.             {

  1229.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1230.             }

  1231.         } else {

  1232.             v->ttmbf = 1;

  1233.             v->ttfrm = TT_8X8;

  1234.         }

  1235.         break;

  1236.     }

  1237. 

  1238.     /* AC Syntax */

  1239.     v->c_ac_table_index = decode012(gb);

  1240.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1241.     {

  1242.         v->y_ac_table_index = decode012(gb);

  1243.     }

  1244.     /* DC Syntax */

  1245.     v->s.dc_table_index = get_bits1(gb);

  1246. 

  1247.     if(v->s.pict_type == BI_TYPE) {

  1248.         v->s.pict_type = B_TYPE;

  1249.         v->bi_type = 1;

  1250.     }

  1251.     return 0;

  1252. }

  1253. 

  1254. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1255. {

  1256.     int pqindex, lowquant;

  1257.     int status;

  1258. 

  1259.     v->p_frame_skipped = 0;

  1260. 

  1261.     if(v->interlace){

  1262.         v->fcm = decode012(gb);

  1263.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1264.     }

  1265.     switch(get_unary(gb, 0, 4)) {

  1266.     case 0:

  1267.         v->s.pict_type = P_TYPE;

  1268.         break;

  1269.     case 1:

  1270.         v->s.pict_type = B_TYPE;

  1271.         break;

  1272.     case 2:

  1273.         v->s.pict_type = I_TYPE;

  1274.         break;

  1275.     case 3:

  1276.         v->s.pict_type = BI_TYPE;

  1277.         break;

  1278.     case 4:

  1279.         v->s.pict_type = P_TYPE; // skipped pic

  1280.         v->p_frame_skipped = 1;

  1281.         return 0;

  1282.     }

  1283.     if(v->tfcntrflag)

  1284.         skip_bits(gb, 8);

  1285.     if(v->broadcast) {

  1286.         if(!v->interlace || v->psf) {

  1287.             v->rptfrm = get_bits(gb, 2);

  1288.         } else {

  1289.             v->tff = get_bits1(gb);

  1290.             v->rptfrm = get_bits1(gb);

  1291.         }

  1292.     }

  1293.     if(v->panscanflag) {

  1294.         //...

  1295.     }

  1296.     v->rnd = get_bits1(gb);

  1297.     if(v->interlace)

  1298.         v->uvsamp = get_bits1(gb);

  1299.     if(v->finterpflag) v->interpfrm = get_bits1(gb);

  1300.     if(v->s.pict_type == B_TYPE) {

  1301.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1302.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1303.         if(v->bfraction == 0) {

  1304.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1305.         }

  1306.     }

  1307.     pqindex = get_bits(gb, 5);

  1308.     v->pqindex = pqindex;

  1309.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1310.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1311.     else

  1312.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1313. 

  1314.     v->pquantizer = 1;

  1315.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1316.         v->pquantizer = pqindex < 9;

  1317.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1318.         v->pquantizer = 0;

  1319.     v->pqindex = pqindex;

  1320.     if (pqindex < 9) v->halfpq = get_bits1(gb);

  1321.     else v->halfpq = 0;

  1322.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1323.         v->pquantizer = get_bits1(gb);

  1324. 

  1325.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1326. 

  1327.     switch(v->s.pict_type) {

  1328.     case I_TYPE:

  1329.     case BI_TYPE:

  1330.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1331.         if (status < 0) return -1;

  1332.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1333.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1334.         v->condover = CONDOVER_NONE;

  1335.         if(v->overlap && v->pq <= 8) {

  1336.             v->condover = decode012(gb);

  1337.             if(v->condover == CONDOVER_SELECT) {

  1338.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1339.                 if (status < 0) return -1;

  1340.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1341.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1342.             }

  1343.         }

  1344.         break;

  1345.     case P_TYPE:

  1346.         if(v->postprocflag)

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

  1348.         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);

  1349.         else v->mvrange = 0;

  1350.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1351.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1352.         v->range_x = 1 << (v->k_x - 1);

  1353.         v->range_y = 1 << (v->k_y - 1);

  1354. 

  1355.         if (v->pq < 5) v->tt_index = 0;

  1356.         else if(v->pq < 13) v->tt_index = 1;

  1357.         else v->tt_index = 2;

  1358. 

  1359.         lowquant = (v->pq > 12) ? 0 : 1;

  1360.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];

  1361.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1362.         {

  1363.             int scale, shift, i;

  1364.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];

  1365.             v->lumscale = get_bits(gb, 6);

  1366.             v->lumshift = get_bits(gb, 6);

  1367.             /* fill lookup tables for intensity compensation */

  1368.             if(!v->lumscale) {

  1369.                 scale = -64;

  1370.                 shift = (255 - v->lumshift * 2) << 6;

  1371.                 if(v->lumshift > 31)

  1372.                     shift += 128 << 6;

  1373.             } else {

  1374.                 scale = v->lumscale + 32;

  1375.                 if(v->lumshift > 31)

  1376.                     shift = (v->lumshift - 64) << 6;

  1377.                 else

  1378.                     shift = v->lumshift << 6;

  1379.             }

  1380.             for(i = 0; i < 256; i++) {

  1381.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1382.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1383.             }

  1384.             v->use_ic = 1;

  1385.         }

  1386.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1387.             v->s.quarter_sample = 0;

  1388.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1389.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1390.                 v->s.quarter_sample = 0;

  1391.             else

  1392.                 v->s.quarter_sample = 1;

  1393.         } else

  1394.             v->s.quarter_sample = 1;

  1395.         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));

  1396. 

  1397.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1398.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1399.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1400.         {

  1401.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1402.             if (status < 0) return -1;

  1403.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1404.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1405.         } else {

  1406.             v->mv_type_is_raw = 0;

  1407.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1408.         }

  1409.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1410.         if (status < 0) return -1;

  1411.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1412.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1413. 

  1414.         /* Hopefully this is correct for P frames */

  1415.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1416.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1417.         if (v->dquant)

  1418.         {

  1419.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1420.             vop_dquant_decoding(v);

  1421.         }

  1422. 

  1423.         v->ttfrm = 0; //FIXME Is that so ?

  1424.         if (v->vstransform)

  1425.         {

  1426.             v->ttmbf = get_bits1(gb);

  1427.             if (v->ttmbf)

  1428.             {

  1429.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1430.             }

  1431.         } else {

  1432.             v->ttmbf = 1;

  1433.             v->ttfrm = TT_8X8;

  1434.         }

  1435.         break;

  1436.     case B_TYPE:

  1437.         if(v->postprocflag)

  1438.             v->postproc = get_bits1(gb);

  1439.         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);

  1440.         else v->mvrange = 0;

  1441.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1442.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1443.         v->range_x = 1 << (v->k_x - 1);

  1444.         v->range_y = 1 << (v->k_y - 1);

  1445. 

  1446.         if (v->pq < 5) v->tt_index = 0;

  1447.         else if(v->pq < 13) v->tt_index = 1;

  1448.         else v->tt_index = 2;

  1449. 

  1450.         lowquant = (v->pq > 12) ? 0 : 1;

  1451.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1452.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1453.         v->s.mspel = v->s.quarter_sample;

  1454. 

  1455.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

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

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

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

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

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

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

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

  1463. 

  1464.         v->s.mv_table_index = get_bits(gb, 2);

  1465.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1466. 

  1467.         if (v->dquant)

  1468.         {

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

  1470.             vop_dquant_decoding(v);

  1471.         }

  1472. 

  1473.         v->ttfrm = 0;

  1474.         if (v->vstransform)

  1475.         {

  1476.             v->ttmbf = get_bits1(gb);

  1477.             if (v->ttmbf)

  1478.             {

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

  1480.             }

  1481.         } else {

  1482.             v->ttmbf = 1;

  1483.             v->ttfrm = TT_8X8;

  1484.         }

  1485.         break;

  1486.     }

  1487. 

  1488.     /* AC Syntax */

  1489.     v->c_ac_table_index = decode012(gb);

  1490.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1491.     {

  1492.         v->y_ac_table_index = decode012(gb);

  1493.     }

  1494.     /* DC Syntax */

  1495.     v->s.dc_table_index = get_bits1(gb);

  1496.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1497.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1498.         vop_dquant_decoding(v);

  1499.     }

  1500. 

  1501.     v->bi_type = 0;

  1502.     if(v->s.pict_type == BI_TYPE) {

  1503.         v->s.pict_type = B_TYPE;

  1504.         v->bi_type = 1;

  1505.     }

  1506.     return 0;

  1507. }

  1508. 

  1509. /***********************************************************************/

  1510. /**

  1511.  * @defgroup block VC-1 Block-level functions

  1512.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1513.  * @{

  1514.  */

  1515. 

  1516. /**

  1517.  * @def GET_MQUANT

  1518.  * @brief Get macroblock-level quantizer scale

  1519.  */

  1520. #define GET_MQUANT()                                           \

  1521.   if (v->dquantfrm)                                            \

  1522.   {                                                            \

  1523.     int edges = 0;                                             \

  1524.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1525.     {                                                          \

  1526.       if (v->dqbilevel)                                        \

  1527.       {                                                        \

  1528.         mquant = (get_bits1(gb)) ? v->altpq : v->pq;           \

  1529.       }                                                        \

  1530.       else                                                     \

  1531.       {                                                        \

  1532.         mqdiff = get_bits(gb, 3);                              \

  1533.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1534.         else mquant = get_bits(gb, 5);                         \

  1535.       }                                                        \

  1536.     }                                                          \

  1537.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1538.         edges = 1 << v->dqsbedge;                              \

  1539.     else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \

  1540.         edges = (3 << v->dqsbedge) % 15;                       \

  1541.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1542.         edges = 15;                                            \

  1543.     if((edges&1) && !s->mb_x)                                  \

  1544.         mquant = v->altpq;                                     \

  1545.     if((edges&2) && s->first_slice_line)                       \

  1546.         mquant = v->altpq;                                     \

  1547.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1548.         mquant = v->altpq;                                     \

  1549.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1550.         mquant = v->altpq;                                     \

  1551.   }

  1552. 

  1553. /**

  1554.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1555.  * @brief Get MV differentials

  1556.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1557.  * @param _dmv_x Horizontal differential for decoded MV

  1558.  * @param _dmv_y Vertical differential for decoded MV

  1559.  */

  1560. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1561.   index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table,\

  1562.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1563.   if (index > 36)                                                   \

  1564.   {                                                                 \

  1565.     mb_has_coeffs = 1;                                              \

  1566.     index -= 37;                                                    \

  1567.   }                                                                 \

  1568.   else mb_has_coeffs = 0;                                           \

  1569.   s->mb_intra = 0;                                                  \

  1570.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1571.   else if (index == 35)                                             \

  1572.   {                                                                 \

  1573.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1574.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1575.   }                                                                 \

  1576.   else if (index == 36)                                             \

  1577.   {                                                                 \

  1578.     _dmv_x = 0;                                                     \

  1579.     _dmv_y = 0;                                                     \

  1580.     s->mb_intra = 1;                                                \

  1581.   }                                                                 \

  1582.   else                                                              \

  1583.   {                                                                 \

  1584.     index1 = index%6;                                               \

  1585.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1586.     else                                   val = 0;                 \

  1587.     if(size_table[index1] - val > 0)                                \

  1588.         val = get_bits(gb, size_table[index1] - val);               \

  1589.     else                                   val = 0;                 \

  1590.     sign = 0 - (val&1);                                             \

  1591.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1592.                                                                     \

  1593.     index1 = index/6;                                               \

  1594.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1595.     else                                   val = 0;                 \

  1596.     if(size_table[index1] - val > 0)                                \

  1597.         val = get_bits(gb, size_table[index1] - val);               \

  1598.     else                                   val = 0;                 \

  1599.     sign = 0 - (val&1);                                             \

  1600.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1601.   }

  1602. 

  1603. /** Predict and set motion vector

  1604.  */

  1605. 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)

  1606. {

  1607.     int xy, wrap, off = 0;

  1608.     int16_t *A, *B, *C;

  1609.     int px, py;

  1610.     int sum;

  1611. 

  1612.     /* scale MV difference to be quad-pel */

  1613.     dmv_x <<= 1 - s->quarter_sample;

  1614.     dmv_y <<= 1 - s->quarter_sample;

  1615. 

  1616.     wrap = s->b8_stride;

  1617.     xy = s->block_index[n];

  1618. 

  1619.     if(s->mb_intra){

  1620.         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;

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

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

  1623.         s->current_picture.motion_val[1][xy][1] = 0;

  1624.         if(mv1) { /* duplicate motion data for 1-MV block */

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

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

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

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

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

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

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

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

  1633.             s->current_picture.motion_val[1][xy + wrap][0] = 0;

  1634.             s->current_picture.motion_val[1][xy + wrap][1] = 0;

  1635.             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;

  1636.             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

  1637.         }

  1638.         return;

  1639.     }

  1640. 

  1641.     C = s->current_picture.motion_val[0][xy - 1];

  1642.     A = s->current_picture.motion_val[0][xy - wrap];

  1643.     if(mv1)

  1644.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1645.     else {

  1646.         //in 4-MV mode different blocks have different B predictor position

  1647.         switch(n){

  1648.         case 0:

  1649.             off = (s->mb_x > 0) ? -1 : 1;

  1650.             break;

  1651.         case 1:

  1652.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1653.             break;

  1654.         case 2:

  1655.             off = 1;

  1656.             break;

  1657.         case 3:

  1658.             off = -1;

  1659.         }

  1660.     }

  1661.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1662. 

  1663.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1664.         if(s->mb_width == 1) {

  1665.             px = A[0];

  1666.             py = A[1];

  1667.         } else {

  1668.             px = mid_pred(A[0], B[0], C[0]);

  1669.             py = mid_pred(A[1], B[1], C[1]);

  1670.         }

  1671.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1672.         px = C[0];

  1673.         py = C[1];

  1674.     } else {

  1675.         px = py = 0;

  1676.     }

  1677.     /* Pullback MV as specified in 8.3.5.3.4 */

  1678.     {

  1679.         int qx, qy, X, Y;

  1680.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1681.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1682.         X = (s->mb_width << 6) - 4;

  1683.         Y = (s->mb_height << 6) - 4;

  1684.         if(mv1) {

  1685.             if(qx + px < -60) px = -60 - qx;

  1686.             if(qy + py < -60) py = -60 - qy;

  1687.         } else {

  1688.             if(qx + px < -28) px = -28 - qx;

  1689.             if(qy + py < -28) py = -28 - qy;

  1690.         }

  1691.         if(qx + px > X) px = X - qx;

  1692.         if(qy + py > Y) py = Y - qy;

  1693.     }

  1694.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1695.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1696.         if(is_intra[xy - wrap])

  1697.             sum = FFABS(px) + FFABS(py);

  1698.         else

  1699.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1700.         if(sum > 32) {

  1701.             if(get_bits1(&s->gb)) {

  1702.                 px = A[0];

  1703.                 py = A[1];

  1704.             } else {

  1705.                 px = C[0];

  1706.                 py = C[1];

  1707.             }

  1708.         } else {

  1709.             if(is_intra[xy - 1])

  1710.                 sum = FFABS(px) + FFABS(py);

  1711.             else

  1712.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1713.             if(sum > 32) {

  1714.                 if(get_bits1(&s->gb)) {

  1715.                     px = A[0];

  1716.                     py = A[1];

  1717.                 } else {

  1718.                     px = C[0];

  1719.                     py = C[1];

  1720.                 }

  1721.             }

  1722.         }

  1723.     }

  1724.     /* store MV using signed modulus of MV range defined in 4.11 */

  1725.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1726.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1727.     if(mv1) { /* duplicate motion data for 1-MV block */

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

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

  1730.         s->current_picture.motion_val[0][xy + wrap][0] = s->current_picture.motion_val[0][xy][0];

  1731.         s->current_picture.motion_val[0][xy + wrap][1] = s->current_picture.motion_val[0][xy][1];

  1732.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1733.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1734.     }

  1735. }

  1736. 

  1737. /** Motion compensation for direct or interpolated blocks in B-frames

  1738.  */

  1739. static void vc1_interp_mc(VC1Context *v)

  1740. {

  1741.     MpegEncContext *s = &v->s;

  1742.     DSPContext *dsp = &v->s.dsp;

  1743.     uint8_t *srcY, *srcU, *srcV;

  1744.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1745. 

  1746.     if(!v->s.next_picture.data[0])return;

  1747. 

  1748.     mx = s->mv[1][0][0];

  1749.     my = s->mv[1][0][1];

  1750.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1751.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1752.     if(v->fastuvmc) {

  1753.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  1754.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  1755.     }

  1756.     srcY = s->next_picture.data[0];

  1757.     srcU = s->next_picture.data[1];

  1758.     srcV = s->next_picture.data[2];

  1759. 

  1760.     src_x = s->mb_x * 16 + (mx >> 2);

  1761.     src_y = s->mb_y * 16 + (my >> 2);

  1762.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1763.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1764. 

  1765.     if(v->profile != PROFILE_ADVANCED){

  1766.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1767.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1768.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1769.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1770.     }else{

  1771.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1772.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1773.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1774.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1775.     }

  1776. 

  1777.     srcY += src_y * s->linesize + src_x;

  1778.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1779.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1780. 

  1781.     /* for grayscale we should not try to read from unknown area */

  1782.     if(s->flags & CODEC_FLAG_GRAY) {

  1783.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1784.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1785.     }

  1786. 

  1787.     if(v->rangeredfrm

  1788.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1789.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1790.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1791. 

  1792.         srcY -= s->mspel * (1 + s->linesize);

  1793.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  1794.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1795.         srcY = s->edge_emu_buffer;

  1796.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1797.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1798.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1799.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1800.         srcU = uvbuf;

  1801.         srcV = uvbuf + 16;

  1802.         /* if we deal with range reduction we need to scale source blocks */

  1803.         if(v->rangeredfrm) {

  1804.             int i, j;

  1805.             uint8_t *src, *src2;

  1806. 

  1807.             src = srcY;

  1808.             for(j = 0; j < 17 + s->mspel*2; j++) {

  1809.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1810.                 src += s->linesize;

  1811.             }

  1812.             src = srcU; src2 = srcV;

  1813.             for(j = 0; j < 9; j++) {

  1814.                 for(i = 0; i < 9; i++) {

  1815.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1816.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1817.                 }

  1818.                 src += s->uvlinesize;

  1819.                 src2 += s->uvlinesize;

  1820.             }

  1821.         }

  1822.         srcY += s->mspel * (1 + s->linesize);

  1823.     }

  1824. 

  1825.     mx >>= 1;

  1826.     my >>= 1;

  1827.     dxy = ((my & 1) << 1) | (mx & 1);

  1828. 

  1829.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1830. 

  1831.     if(s->flags & CODEC_FLAG_GRAY) return;

  1832.     /* Chroma MC always uses qpel blilinear */

  1833.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1834.     uvmx = (uvmx&3)<<1;

  1835.     uvmy = (uvmy&3)<<1;

  1836.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1837.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1838. }

  1839. 

  1840. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1841. {

  1842.     int n = bfrac;

  1843. 

  1844. #if B_FRACTION_DEN==256

  1845.     if(inv)

  1846.         n -= 256;

  1847.     if(!qs)

  1848.         return 2 * ((value * n + 255) >> 9);

  1849.     return (value * n + 128) >> 8;

  1850. #else

  1851.     if(inv)

  1852.         n -= B_FRACTION_DEN;

  1853.     if(!qs)

  1854.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1855.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1856. #endif

  1857. }

  1858. 

  1859. /** Reconstruct motion vector for B-frame and do motion compensation

  1860.  */

  1861. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1862. {

  1863.     if(v->use_ic) {

  1864.         v->mv_mode2 = v->mv_mode;

  1865.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  1866.     }

  1867.     if(direct) {

  1868.         vc1_mc_1mv(v, 0);

  1869.         vc1_interp_mc(v);

  1870.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1871.         return;

  1872.     }

  1873.     if(mode == BMV_TYPE_INTERPOLATED) {

  1874.         vc1_mc_1mv(v, 0);

  1875.         vc1_interp_mc(v);

  1876.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1877.         return;

  1878.     }

  1879. 

  1880.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  1881.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  1882.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  1883. }

  1884. 

  1885. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  1886. {

  1887.     MpegEncContext *s = &v->s;

  1888.     int xy, wrap, off = 0;

  1889.     int16_t *A, *B, *C;

  1890.     int px, py;

  1891.     int sum;

  1892.     int r_x, r_y;

  1893.     const uint8_t *is_intra = v->mb_type[0];

  1894. 

  1895.     r_x = v->range_x;

  1896.     r_y = v->range_y;

  1897.     /* scale MV difference to be quad-pel */

  1898.     dmv_x[0] <<= 1 - s->quarter_sample;

  1899.     dmv_y[0] <<= 1 - s->quarter_sample;

  1900.     dmv_x[1] <<= 1 - s->quarter_sample;

  1901.     dmv_y[1] <<= 1 - s->quarter_sample;

  1902. 

  1903.     wrap = s->b8_stride;

  1904.     xy = s->block_index[0];

  1905. 

  1906.     if(s->mb_intra) {

  1907.         s->current_picture.motion_val[0][xy][0] =

  1908.         s->current_picture.motion_val[0][xy][1] =

  1909.         s->current_picture.motion_val[1][xy][0] =

  1910.         s->current_picture.motion_val[1][xy][1] = 0;

  1911.         return;

  1912.     }

  1913.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  1914.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  1915.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  1916.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  1917. 

  1918.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  1919.     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));

  1920.     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));

  1921.     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));

  1922.     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));

  1923.     if(direct) {

  1924.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  1925.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  1926.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  1927.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  1928.         return;

  1929.     }

  1930. 

  1931.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  1932.         C = s->current_picture.motion_val[0][xy - 2];

  1933.         A = s->current_picture.motion_val[0][xy - wrap*2];

  1934.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1935.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  1936. 

  1937.         if(!s->mb_x) C[0] = C[1] = 0;

  1938.         if(!s->first_slice_line) { // predictor A is not out of bounds

  1939.             if(s->mb_width == 1) {

  1940.                 px = A[0];

  1941.                 py = A[1];

  1942.             } else {

  1943.                 px = mid_pred(A[0], B[0], C[0]);

  1944.                 py = mid_pred(A[1], B[1], C[1]);

  1945.             }

  1946.         } else if(s->mb_x) { // predictor C is not out of bounds

  1947.             px = C[0];

  1948.             py = C[1];

  1949.         } else {

  1950.             px = py = 0;

  1951.         }

  1952.         /* Pullback MV as specified in 8.3.5.3.4 */

  1953.         {

  1954.             int qx, qy, X, Y;

  1955.             if(v->profile < PROFILE_ADVANCED) {

  1956.                 qx = (s->mb_x << 5);

  1957.                 qy = (s->mb_y << 5);

  1958.                 X = (s->mb_width << 5) - 4;

  1959.                 Y = (s->mb_height << 5) - 4;

  1960.                 if(qx + px < -28) px = -28 - qx;

  1961.                 if(qy + py < -28) py = -28 - qy;

  1962.                 if(qx + px > X) px = X - qx;

  1963.                 if(qy + py > Y) py = Y - qy;

  1964.             } else {

  1965.                 qx = (s->mb_x << 6);

  1966.                 qy = (s->mb_y << 6);

  1967.                 X = (s->mb_width << 6) - 4;

  1968.                 Y = (s->mb_height << 6) - 4;

  1969.                 if(qx + px < -60) px = -60 - qx;

  1970.                 if(qy + py < -60) py = -60 - qy;

  1971.                 if(qx + px > X) px = X - qx;

  1972.                 if(qy + py > Y) py = Y - qy;

  1973.             }

  1974.         }

  1975.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1976.         if(0 && !s->first_slice_line && s->mb_x) {

  1977.             if(is_intra[xy - wrap])

  1978.                 sum = FFABS(px) + FFABS(py);

  1979.             else

  1980.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1981.             if(sum > 32) {

  1982.                 if(get_bits1(&s->gb)) {

  1983.                     px = A[0];

  1984.                     py = A[1];

  1985.                 } else {

  1986.                     px = C[0];

  1987.                     py = C[1];

  1988.                 }

  1989.             } else {

  1990.                 if(is_intra[xy - 2])

  1991.                     sum = FFABS(px) + FFABS(py);

  1992.                 else

  1993.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1994.                 if(sum > 32) {

  1995.                     if(get_bits1(&s->gb)) {

  1996.                         px = A[0];

  1997.                         py = A[1];

  1998.                     } else {

  1999.                         px = C[0];

  2000.                         py = C[1];

  2001.                     }

  2002.                 }

  2003.             }

  2004.         }

  2005.         /* store MV using signed modulus of MV range defined in 4.11 */

  2006.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2007.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2008.     }

  2009.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2010.         C = s->current_picture.motion_val[1][xy - 2];

  2011.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2012.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2013.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2014. 

  2015.         if(!s->mb_x) C[0] = C[1] = 0;

  2016.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2017.             if(s->mb_width == 1) {

  2018.                 px = A[0];

  2019.                 py = A[1];

  2020.             } else {

  2021.                 px = mid_pred(A[0], B[0], C[0]);

  2022.                 py = mid_pred(A[1], B[1], C[1]);

  2023.             }

  2024.         } else if(s->mb_x) { // predictor C is not out of bounds

  2025.             px = C[0];

  2026.             py = C[1];

  2027.         } else {

  2028.             px = py = 0;

  2029.         }

  2030.         /* Pullback MV as specified in 8.3.5.3.4 */

  2031.         {

  2032.             int qx, qy, X, Y;

  2033.             if(v->profile < PROFILE_ADVANCED) {

  2034.                 qx = (s->mb_x << 5);

  2035.                 qy = (s->mb_y << 5);

  2036.                 X = (s->mb_width << 5) - 4;

  2037.                 Y = (s->mb_height << 5) - 4;

  2038.                 if(qx + px < -28) px = -28 - qx;

  2039.                 if(qy + py < -28) py = -28 - qy;

  2040.                 if(qx + px > X) px = X - qx;

  2041.                 if(qy + py > Y) py = Y - qy;

  2042.             } else {

  2043.                 qx = (s->mb_x << 6);

  2044.                 qy = (s->mb_y << 6);

  2045.                 X = (s->mb_width << 6) - 4;

  2046.                 Y = (s->mb_height << 6) - 4;

  2047.                 if(qx + px < -60) px = -60 - qx;

  2048.                 if(qy + py < -60) py = -60 - qy;

  2049.                 if(qx + px > X) px = X - qx;

  2050.                 if(qy + py > Y) py = Y - qy;

  2051.             }

  2052.         }

  2053.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2054.         if(0 && !s->first_slice_line && s->mb_x) {

  2055.             if(is_intra[xy - wrap])

  2056.                 sum = FFABS(px) + FFABS(py);

  2057.             else

  2058.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2059.             if(sum > 32) {

  2060.                 if(get_bits1(&s->gb)) {

  2061.                     px = A[0];

  2062.                     py = A[1];

  2063.                 } else {

  2064.                     px = C[0];

  2065.                     py = C[1];

  2066.                 }

  2067.             } else {

  2068.                 if(is_intra[xy - 2])

  2069.                     sum = FFABS(px) + FFABS(py);

  2070.                 else

  2071.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2072.                 if(sum > 32) {

  2073.                     if(get_bits1(&s->gb)) {

  2074.                         px = A[0];

  2075.                         py = A[1];

  2076.                     } else {

  2077.                         px = C[0];

  2078.                         py = C[1];

  2079.                     }

  2080.                 }

  2081.             }

  2082.         }

  2083.         /* store MV using signed modulus of MV range defined in 4.11 */

  2084. 

  2085.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2086.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2087.     }

  2088.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2089.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2090.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2091.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2092. }

  2093. 

  2094. /** Get predicted DC value for I-frames only

  2095.  * prediction dir: left=0, top=1

  2096.  * @param s MpegEncContext

  2097.  * @param[in] n block index in the current MB

  2098.  * @param dc_val_ptr Pointer to DC predictor

  2099.  * @param dir_ptr Prediction direction for use in AC prediction

  2100.  */

  2101. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2102.                               int16_t **dc_val_ptr, int *dir_ptr)

  2103. {

  2104.     int a, b, c, wrap, pred, scale;

  2105.     int16_t *dc_val;

  2106.     static const uint16_t dcpred[32] = {

  2107.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2108.          114,  102,   93,   85,   79,   73,   68,   64,

  2109.           60,   57,   54,   51,   49,   47,   45,   43,

  2110.           41,   39,   38,   37,   35,   34,   33

  2111.     };

  2112. 

  2113.     /* find prediction - wmv3_dc_scale always used here in fact */

  2114.     if (n < 4)     scale = s->y_dc_scale;

  2115.     else           scale = s->c_dc_scale;

  2116. 

  2117.     wrap = s->block_wrap[n];

  2118.     dc_val= s->dc_val[0] + s->block_index[n];

  2119. 

  2120.     /* B A

  2121.      * C X

  2122.      */

  2123.     c = dc_val[ - 1];

  2124.     b = dc_val[ - 1 - wrap];

  2125.     a = dc_val[ - wrap];

  2126. 

  2127.     if (pq < 9 || !overlap)

  2128.     {

  2129.         /* Set outer values */

  2130.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2131.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2132.     }

  2133.     else

  2134.     {

  2135.         /* Set outer values */

  2136.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2137.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2138.     }

  2139. 

  2140.     if (abs(a - b) <= abs(b - c)) {

  2141.         pred = c;

  2142.         *dir_ptr = 1;//left

  2143.     } else {

  2144.         pred = a;

  2145.         *dir_ptr = 0;//top

  2146.     }

  2147. 

  2148.     /* update predictor */

  2149.     *dc_val_ptr = &dc_val[0];

  2150.     return pred;

  2151. }

  2152. 

  2153. 

  2154. /** Get predicted DC value

  2155.  * prediction dir: left=0, top=1

  2156.  * @param s MpegEncContext

  2157.  * @param[in] n block index in the current MB

  2158.  * @param dc_val_ptr Pointer to DC predictor

  2159.  * @param dir_ptr Prediction direction for use in AC prediction

  2160.  */

  2161. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2162.                               int a_avail, int c_avail,

  2163.                               int16_t **dc_val_ptr, int *dir_ptr)

  2164. {

  2165.     int a, b, c, wrap, pred, scale;

  2166.     int16_t *dc_val;

  2167.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2168.     int q1, q2 = 0;

  2169. 

  2170.     /* find prediction - wmv3_dc_scale always used here in fact */

  2171.     if (n < 4)     scale = s->y_dc_scale;

  2172.     else           scale = s->c_dc_scale;

  2173. 

  2174.     wrap = s->block_wrap[n];

  2175.     dc_val= s->dc_val[0] + s->block_index[n];

  2176. 

  2177.     /* B A

  2178.      * C X

  2179.      */

  2180.     c = dc_val[ - 1];

  2181.     b = dc_val[ - 1 - wrap];

  2182.     a = dc_val[ - wrap];

  2183.     /* scale predictors if needed */

  2184.     q1 = s->current_picture.qscale_table[mb_pos];

  2185.     if(c_avail && (n!= 1 && n!=3)) {

  2186.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2187.         if(q2 && q2 != q1)

  2188.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2189.     }

  2190.     if(a_avail && (n!= 2 && n!=3)) {

  2191.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2192.         if(q2 && q2 != q1)

  2193.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2194.     }

  2195.     if(a_avail && c_avail && (n!=3)) {

  2196.         int off = mb_pos;

  2197.         if(n != 1) off--;

  2198.         if(n != 2) off -= s->mb_stride;

  2199.         q2 = s->current_picture.qscale_table[off];

  2200.         if(q2 && q2 != q1)

  2201.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2202.     }

  2203. 

  2204.     if(a_avail && c_avail) {

  2205.         if(abs(a - b) <= abs(b - c)) {

  2206.             pred = c;

  2207.             *dir_ptr = 1;//left

  2208.         } else {

  2209.             pred = a;

  2210.             *dir_ptr = 0;//top

  2211.         }

  2212.     } else if(a_avail) {

  2213.         pred = a;

  2214.         *dir_ptr = 0;//top

  2215.     } else if(c_avail) {

  2216.         pred = c;

  2217.         *dir_ptr = 1;//left

  2218.     } else {

  2219.         pred = 0;

  2220.         *dir_ptr = 1;//left

  2221.     }

  2222. 

  2223.     /* update predictor */

  2224.     *dc_val_ptr = &dc_val[0];

  2225.     return pred;

  2226. }

  2227. 

  2228. 

  2229. /**

  2230.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2231.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2232.  * @{

  2233.  */

  2234. 

  2235. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2236. {

  2237.     int xy, wrap, pred, a, b, c;

  2238. 

  2239.     xy = s->block_index[n];

  2240.     wrap = s->b8_stride;

  2241. 

  2242.     /* B C

  2243.      * A X

  2244.      */

  2245.     a = s->coded_block[xy - 1       ];

  2246.     b = s->coded_block[xy - 1 - wrap];

  2247.     c = s->coded_block[xy     - wrap];

  2248. 

  2249.     if (b == c) {

  2250.         pred = a;

  2251.     } else {

  2252.         pred = c;

  2253.     }

  2254. 

  2255.     /* store value */

  2256.     *coded_block_ptr = &s->coded_block[xy];

  2257. 

  2258.     return pred;

  2259. }

  2260. 

  2261. /**

  2262.  * Decode one AC coefficient

  2263.  * @param v The VC1 context

  2264.  * @param last Last coefficient

  2265.  * @param skip How much zero coefficients to skip

  2266.  * @param value Decoded AC coefficient value

  2267.  * @see 8.1.3.4

  2268.  */

  2269. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2270. {

  2271.     GetBitContext *gb = &v->s.gb;

  2272.     int index, escape, run = 0, level = 0, lst = 0;

  2273. 

  2274.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2275.     if (index != vc1_ac_sizes[codingset] - 1) {

  2276.         run = vc1_index_decode_table[codingset][index][0];

  2277.         level = vc1_index_decode_table[codingset][index][1];

  2278.         lst = index >= vc1_last_decode_table[codingset];

  2279.         if(get_bits1(gb))

  2280.             level = -level;

  2281.     } else {

  2282.         escape = decode210(gb);

  2283.         if (escape != 2) {

  2284.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2285.             run = vc1_index_decode_table[codingset][index][0];

  2286.             level = vc1_index_decode_table[codingset][index][1];

  2287.             lst = index >= vc1_last_decode_table[codingset];

  2288.             if(escape == 0) {

  2289.                 if(lst)

  2290.                     level += vc1_last_delta_level_table[codingset][run];

  2291.                 else

  2292.                     level += vc1_delta_level_table[codingset][run];

  2293.             } else {

  2294.                 if(lst)

  2295.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2296.                 else

  2297.                     run += vc1_delta_run_table[codingset][level] + 1;

  2298.             }

  2299.             if(get_bits1(gb))

  2300.                 level = -level;

  2301.         } else {

  2302.             int sign;

  2303.             lst = get_bits1(gb);

  2304.             if(v->s.esc3_level_length == 0) {

  2305.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2306.                     v->s.esc3_level_length = get_bits(gb, 3);

  2307.                     if(!v->s.esc3_level_length)

  2308.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2309.                 } else { //table 60

  2310.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  2311.                 }

  2312.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2313.             }

  2314.             run = get_bits(gb, v->s.esc3_run_length);

  2315.             sign = get_bits1(gb);

  2316.             level = get_bits(gb, v->s.esc3_level_length);

  2317.             if(sign)

  2318.                 level = -level;

  2319.         }

  2320.     }

  2321. 

  2322.     *last = lst;

  2323.     *skip = run;

  2324.     *value = level;

  2325. }

  2326. 

  2327. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2328.  * @param v VC1Context

  2329.  * @param block block to decode

  2330.  * @param coded are AC coeffs present or not

  2331.  * @param codingset set of VLC to decode data

  2332.  */

  2333. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2334. {

  2335.     GetBitContext *gb = &v->s.gb;

  2336.     MpegEncContext *s = &v->s;

  2337.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2338.     int run_diff, i;

  2339.     int16_t *dc_val;

  2340.     int16_t *ac_val, *ac_val2;

  2341.     int dcdiff;

  2342. 

  2343.     /* Get DC differential */

  2344.     if (n < 4) {

  2345.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2346.     } else {

  2347.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2348.     }

  2349.     if (dcdiff < 0){

  2350.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2351.         return -1;

  2352.     }

  2353.     if (dcdiff)

  2354.     {

  2355.         if (dcdiff == 119 /* ESC index value */)

  2356.         {

  2357.             /* TODO: Optimize */

  2358.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2359.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2360.             else dcdiff = get_bits(gb, 8);

  2361.         }

  2362.         else

  2363.         {

  2364.             if (v->pq == 1)

  2365.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2366.             else if (v->pq == 2)

  2367.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2368.         }

  2369.         if (get_bits1(gb))

  2370.             dcdiff = -dcdiff;

  2371.     }

  2372. 

  2373.     /* Prediction */

  2374.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2375.     *dc_val = dcdiff;

  2376. 

  2377.     /* Store the quantized DC coeff, used for prediction */

  2378.     if (n < 4) {

  2379.         block[0] = dcdiff * s->y_dc_scale;

  2380.     } else {

  2381.         block[0] = dcdiff * s->c_dc_scale;

  2382.     }

  2383.     /* Skip ? */

  2384.     run_diff = 0;

  2385.     i = 0;

  2386.     if (!coded) {

  2387.         goto not_coded;

  2388.     }

  2389. 

  2390.     //AC Decoding

  2391.     i = 1;

  2392. 

  2393.     {

  2394.         int last = 0, skip, value;

  2395.         const int8_t *zz_table;

  2396.         int scale;

  2397.         int k;

  2398. 

  2399.         scale = v->pq * 2 + v->halfpq;

  2400. 

  2401.         if(v->s.ac_pred) {

  2402.             if(!dc_pred_dir)

  2403.                 zz_table = ff_vc1_horizontal_zz;

  2404.             else

  2405.                 zz_table = ff_vc1_vertical_zz;

  2406.         } else

  2407.             zz_table = ff_vc1_normal_zz;

  2408. 

  2409.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2410.         ac_val2 = ac_val;

  2411.         if(dc_pred_dir) //left

  2412.             ac_val -= 16;

  2413.         else //top

  2414.             ac_val -= 16 * s->block_wrap[n];

  2415. 

  2416.         while (!last) {

  2417.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2418.             i += skip;

  2419.             if(i > 63)

  2420.                 break;

  2421.             block[zz_table[i++]] = value;

  2422.         }

  2423. 

  2424.         /* apply AC prediction if needed */

  2425.         if(s->ac_pred) {

  2426.             if(dc_pred_dir) { //left

  2427.                 for(k = 1; k < 8; k++)

  2428.                     block[k << 3] += ac_val[k];

  2429.             } else { //top

  2430.                 for(k = 1; k < 8; k++)

  2431.                     block[k] += ac_val[k + 8];

  2432.             }

  2433.         }

  2434.         /* save AC coeffs for further prediction */

  2435.         for(k = 1; k < 8; k++) {

  2436.             ac_val2[k] = block[k << 3];

  2437.             ac_val2[k + 8] = block[k];

  2438.         }

  2439. 

  2440.         /* scale AC coeffs */

  2441.         for(k = 1; k < 64; k++)

  2442.             if(block[k]) {

  2443.                 block[k] *= scale;

  2444.                 if(!v->pquantizer)

  2445.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2446.             }

  2447. 

  2448.         if(s->ac_pred) i = 63;

  2449.     }

  2450. 

  2451. not_coded:

  2452.     if(!coded) {

  2453.         int k, scale;

  2454.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2455.         ac_val2 = ac_val;

  2456. 

  2457.         scale = v->pq * 2 + v->halfpq;

  2458.         memset(ac_val2, 0, 16 * 2);

  2459.         if(dc_pred_dir) {//left

  2460.             ac_val -= 16;

  2461.             if(s->ac_pred)

  2462.                 memcpy(ac_val2, ac_val, 8 * 2);

  2463.         } else {//top

  2464.             ac_val -= 16 * s->block_wrap[n];

  2465.             if(s->ac_pred)

  2466.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2467.         }

  2468. 

  2469.         /* apply AC prediction if needed */

  2470.         if(s->ac_pred) {

  2471.             if(dc_pred_dir) { //left

  2472.                 for(k = 1; k < 8; k++) {

  2473.                     block[k << 3] = ac_val[k] * scale;

  2474.                     if(!v->pquantizer && block[k << 3])

  2475.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2476.                 }

  2477.             } else { //top

  2478.                 for(k = 1; k < 8; k++) {

  2479.                     block[k] = ac_val[k + 8] * scale;

  2480.                     if(!v->pquantizer && block[k])

  2481.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2482.                 }

  2483.             }

  2484.             i = 63;

  2485.         }

  2486.     }

  2487.     s->block_last_index[n] = i;

  2488. 

  2489.     return 0;

  2490. }

  2491. 

  2492. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2493.  * @param v VC1Context

  2494.  * @param block block to decode

  2495.  * @param coded are AC coeffs present or not

  2496.  * @param codingset set of VLC to decode data

  2497.  */

  2498. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2499. {

  2500.     GetBitContext *gb = &v->s.gb;

  2501.     MpegEncContext *s = &v->s;

  2502.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2503.     int run_diff, i;

  2504.     int16_t *dc_val;

  2505.     int16_t *ac_val, *ac_val2;

  2506.     int dcdiff;

  2507.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2508.     int use_pred = s->ac_pred;

  2509.     int scale;

  2510.     int q1, q2 = 0;

  2511.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2512. 

  2513.     /* Get DC differential */

  2514.     if (n < 4) {

  2515.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2516.     } else {

  2517.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2518.     }

  2519.     if (dcdiff < 0){

  2520.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2521.         return -1;

  2522.     }

  2523.     if (dcdiff)

  2524.     {

  2525.         if (dcdiff == 119 /* ESC index value */)

  2526.         {

  2527.             /* TODO: Optimize */

  2528.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2529.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2530.             else dcdiff = get_bits(gb, 8);

  2531.         }

  2532.         else

  2533.         {

  2534.             if (mquant == 1)

  2535.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2536.             else if (mquant == 2)

  2537.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2538.         }

  2539.         if (get_bits1(gb))

  2540.             dcdiff = -dcdiff;

  2541.     }

  2542. 

  2543.     /* Prediction */

  2544.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2545.     *dc_val = dcdiff;

  2546. 

  2547.     /* Store the quantized DC coeff, used for prediction */

  2548.     if (n < 4) {

  2549.         block[0] = dcdiff * s->y_dc_scale;

  2550.     } else {

  2551.         block[0] = dcdiff * s->c_dc_scale;

  2552.     }

  2553.     /* Skip ? */

  2554.     run_diff = 0;

  2555.     i = 0;

  2556. 

  2557.     //AC Decoding

  2558.     i = 1;

  2559. 

  2560.     /* check if AC is needed at all */

  2561.     if(!a_avail && !c_avail) use_pred = 0;

  2562.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2563.     ac_val2 = ac_val;

  2564. 

  2565.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  2566. 

  2567.     if(dc_pred_dir) //left

  2568.         ac_val -= 16;

  2569.     else //top

  2570.         ac_val -= 16 * s->block_wrap[n];

  2571. 

  2572.     q1 = s->current_picture.qscale_table[mb_pos];

  2573.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2574.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2575.     if(dc_pred_dir && n==1) q2 = q1;

  2576.     if(!dc_pred_dir && n==2) q2 = q1;

  2577.     if(n==3) q2 = q1;

  2578. 

  2579.     if(coded) {

  2580.         int last = 0, skip, value;

  2581.         const int8_t *zz_table;

  2582.         int k;

  2583. 

  2584.         if(v->s.ac_pred) {

  2585.             if(!dc_pred_dir)

  2586.                 zz_table = ff_vc1_horizontal_zz;

  2587.             else

  2588.                 zz_table = ff_vc1_vertical_zz;

  2589.         } else

  2590.             zz_table = ff_vc1_normal_zz;

  2591. 

  2592.         while (!last) {

  2593.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2594.             i += skip;

  2595.             if(i > 63)

  2596.                 break;

  2597.             block[zz_table[i++]] = value;

  2598.         }

  2599. 

  2600.         /* apply AC prediction if needed */

  2601.         if(use_pred) {

  2602.             /* scale predictors if needed*/

  2603.             if(q2 && q1!=q2) {

  2604.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2605.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2606. 

  2607.                 if(dc_pred_dir) { //left

  2608.                     for(k = 1; k < 8; k++)

  2609.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2610.                 } else { //top

  2611.                     for(k = 1; k < 8; k++)

  2612.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2613.                 }

  2614.             } else {

  2615.                 if(dc_pred_dir) { //left

  2616.                     for(k = 1; k < 8; k++)

  2617.                         block[k << 3] += ac_val[k];

  2618.                 } else { //top

  2619.                     for(k = 1; k < 8; k++)

  2620.                         block[k] += ac_val[k + 8];

  2621.                 }

  2622.             }

  2623.         }

  2624.         /* save AC coeffs for further prediction */

  2625.         for(k = 1; k < 8; k++) {

  2626.             ac_val2[k] = block[k << 3];

  2627.             ac_val2[k + 8] = block[k];

  2628.         }

  2629. 

  2630.         /* scale AC coeffs */

  2631.         for(k = 1; k < 64; k++)

  2632.             if(block[k]) {

  2633.                 block[k] *= scale;

  2634.                 if(!v->pquantizer)

  2635.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2636.             }

  2637. 

  2638.         if(use_pred) i = 63;

  2639.     } else { // no AC coeffs

  2640.         int k;

  2641. 

  2642.         memset(ac_val2, 0, 16 * 2);

  2643.         if(dc_pred_dir) {//left

  2644.             if(use_pred) {

  2645.                 memcpy(ac_val2, ac_val, 8 * 2);

  2646.                 if(q2 && q1!=q2) {

  2647.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2648.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2649.                     for(k = 1; k < 8; k++)

  2650.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2651.                 }

  2652.             }

  2653.         } else {//top

  2654.             if(use_pred) {

  2655.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2656.                 if(q2 && q1!=q2) {

  2657.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2658.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2659.                     for(k = 1; k < 8; k++)

  2660.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2661.                 }

  2662.             }

  2663.         }

  2664. 

  2665.         /* apply AC prediction if needed */

  2666.         if(use_pred) {

  2667.             if(dc_pred_dir) { //left

  2668.                 for(k = 1; k < 8; k++) {

  2669.                     block[k << 3] = ac_val2[k] * scale;

  2670.                     if(!v->pquantizer && block[k << 3])

  2671.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2672.                 }

  2673.             } else { //top

  2674.                 for(k = 1; k < 8; k++) {

  2675.                     block[k] = ac_val2[k + 8] * scale;

  2676.                     if(!v->pquantizer && block[k])

  2677.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2678.                 }

  2679.             }

  2680.             i = 63;

  2681.         }

  2682.     }

  2683.     s->block_last_index[n] = i;

  2684. 

  2685.     return 0;

  2686. }

  2687. 

  2688. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2689.  * @param v VC1Context

  2690.  * @param block block to decode

  2691.  * @param coded are AC coeffs present or not

  2692.  * @param mquant block quantizer

  2693.  * @param codingset set of VLC to decode data

  2694.  */

  2695. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2696. {

  2697.     GetBitContext *gb = &v->s.gb;

  2698.     MpegEncContext *s = &v->s;

  2699.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2700.     int run_diff, i;

  2701.     int16_t *dc_val;

  2702.     int16_t *ac_val, *ac_val2;

  2703.     int dcdiff;

  2704.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2705.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2706.     int use_pred = s->ac_pred;

  2707.     int scale;

  2708.     int q1, q2 = 0;

  2709. 

  2710.     /* XXX: Guard against dumb values of mquant */

  2711.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2712. 

  2713.     /* Set DC scale - y and c use the same */

  2714.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2715.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2716. 

  2717.     /* Get DC differential */

  2718.     if (n < 4) {

  2719.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2720.     } else {

  2721.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2722.     }

  2723.     if (dcdiff < 0){

  2724.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2725.         return -1;

  2726.     }

  2727.     if (dcdiff)

  2728.     {

  2729.         if (dcdiff == 119 /* ESC index value */)

  2730.         {

  2731.             /* TODO: Optimize */

  2732.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2733.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2734.             else dcdiff = get_bits(gb, 8);

  2735.         }

  2736.         else

  2737.         {

  2738.             if (mquant == 1)

  2739.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2740.             else if (mquant == 2)

  2741.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2742.         }

  2743.         if (get_bits1(gb))

  2744.             dcdiff = -dcdiff;

  2745.     }

  2746. 

  2747.     /* Prediction */

  2748.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2749.     *dc_val = dcdiff;

  2750. 

  2751.     /* Store the quantized DC coeff, used for prediction */

  2752. 

  2753.     if (n < 4) {

  2754.         block[0] = dcdiff * s->y_dc_scale;

  2755.     } else {

  2756.         block[0] = dcdiff * s->c_dc_scale;

  2757.     }

  2758.     /* Skip ? */

  2759.     run_diff = 0;

  2760.     i = 0;

  2761. 

  2762.     //AC Decoding

  2763.     i = 1;

  2764. 

  2765.     /* check if AC is needed at all and adjust direction if needed */

  2766.     if(!a_avail) dc_pred_dir = 1;

  2767.     if(!c_avail) dc_pred_dir = 0;

  2768.     if(!a_avail && !c_avail) use_pred = 0;

  2769.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2770.     ac_val2 = ac_val;

  2771. 

  2772.     scale = mquant * 2 + v->halfpq;

  2773. 

  2774.     if(dc_pred_dir) //left

  2775.         ac_val -= 16;

  2776.     else //top

  2777.         ac_val -= 16 * s->block_wrap[n];

  2778. 

  2779.     q1 = s->current_picture.qscale_table[mb_pos];

  2780.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2781.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2782.     if(dc_pred_dir && n==1) q2 = q1;

  2783.     if(!dc_pred_dir && n==2) q2 = q1;

  2784.     if(n==3) q2 = q1;

  2785. 

  2786.     if(coded) {

  2787.         int last = 0, skip, value;

  2788.         const int8_t *zz_table;

  2789.         int k;

  2790. 

  2791.         zz_table = ff_vc1_simple_progressive_8x8_zz;

  2792. 

  2793.         while (!last) {

  2794.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2795.             i += skip;

  2796.             if(i > 63)

  2797.                 break;

  2798.             block[zz_table[i++]] = value;

  2799.         }

  2800. 

  2801.         /* apply AC prediction if needed */

  2802.         if(use_pred) {

  2803.             /* scale predictors if needed*/

  2804.             if(q2 && q1!=q2) {

  2805.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2806.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2807. 

  2808.                 if(dc_pred_dir) { //left

  2809.                     for(k = 1; k < 8; k++)

  2810.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2811.                 } else { //top

  2812.                     for(k = 1; k < 8; k++)

  2813.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2814.                 }

  2815.             } else {

  2816.                 if(dc_pred_dir) { //left

  2817.                     for(k = 1; k < 8; k++)

  2818.                         block[k << 3] += ac_val[k];

  2819.                 } else { //top

  2820.                     for(k = 1; k < 8; k++)

  2821.                         block[k] += ac_val[k + 8];

  2822.                 }

  2823.             }

  2824.         }

  2825.         /* save AC coeffs for further prediction */

  2826.         for(k = 1; k < 8; k++) {

  2827.             ac_val2[k] = block[k << 3];

  2828.             ac_val2[k + 8] = block[k];

  2829.         }

  2830. 

  2831.         /* scale AC coeffs */

  2832.         for(k = 1; k < 64; k++)

  2833.             if(block[k]) {

  2834.                 block[k] *= scale;

  2835.                 if(!v->pquantizer)

  2836.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2837.             }

  2838. 

  2839.         if(use_pred) i = 63;

  2840.     } else { // no AC coeffs

  2841.         int k;

  2842. 

  2843.         memset(ac_val2, 0, 16 * 2);

  2844.         if(dc_pred_dir) {//left

  2845.             if(use_pred) {

  2846.                 memcpy(ac_val2, ac_val, 8 * 2);

  2847.                 if(q2 && q1!=q2) {

  2848.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2849.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2850.                     for(k = 1; k < 8; k++)

  2851.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2852.                 }

  2853.             }

  2854.         } else {//top

  2855.             if(use_pred) {

  2856.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2857.                 if(q2 && q1!=q2) {

  2858.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2859.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2860.                     for(k = 1; k < 8; k++)

  2861.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2862.                 }

  2863.             }

  2864.         }

  2865. 

  2866.         /* apply AC prediction if needed */

  2867.         if(use_pred) {

  2868.             if(dc_pred_dir) { //left

  2869.                 for(k = 1; k < 8; k++) {

  2870.                     block[k << 3] = ac_val2[k] * scale;

  2871.                     if(!v->pquantizer && block[k << 3])

  2872.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2873.                 }

  2874.             } else { //top

  2875.                 for(k = 1; k < 8; k++) {

  2876.                     block[k] = ac_val2[k + 8] * scale;

  2877.                     if(!v->pquantizer && block[k])

  2878.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2879.                 }

  2880.             }

  2881.             i = 63;

  2882.         }

  2883.     }

  2884.     s->block_last_index[n] = i;

  2885. 

  2886.     return 0;

  2887. }

  2888. 

  2889. /** Decode P block

  2890.  */

  2891. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2892. {

  2893.     MpegEncContext *s = &v->s;

  2894.     GetBitContext *gb = &s->gb;

  2895.     int i, j;

  2896.     int subblkpat = 0;

  2897.     int scale, off, idx, last, skip, value;

  2898.     int ttblk = ttmb & 7;

  2899. 

  2900.     if(ttmb == -1) {

  2901.         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)];

  2902.     }

  2903.     if(ttblk == TT_4X4) {

  2904.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2905.     }

  2906.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2907.         subblkpat = decode012(gb);

  2908.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2909.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2910.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2911.     }

  2912.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  2913. 

  2914.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2915.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2916.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2917.         ttblk = TT_8X4;

  2918.     }

  2919.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2920.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2921.         ttblk = TT_4X8;

  2922.     }

  2923.     switch(ttblk) {

  2924.     case TT_8X8:

  2925.         i = 0;

  2926.         last = 0;

  2927.         while (!last) {

  2928.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2929.             i += skip;

  2930.             if(i > 63)

  2931.                 break;

  2932.             idx = ff_vc1_simple_progressive_8x8_zz[i++];

  2933.             block[idx] = value * scale;

  2934.             if(!v->pquantizer)

  2935.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2936.         }

  2937.         s->dsp.vc1_inv_trans_8x8(block);

  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))))

  2955.                 s->dsp.vc1_inv_trans_4x4(block, j);

  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.                 if(v->profile < PROFILE_ADVANCED)

  2969.                     idx = ff_vc1_simple_progressive_8x4_zz[i++];

  2970.                 else

  2971.                     idx = ff_vc1_adv_progressive_8x4_zz[i++];

  2972.                 block[idx + off] = value * scale;

  2973.                 if(!v->pquantizer)

  2974.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2975.             }

  2976.             if(!(subblkpat & (1 << (1 - j))))

  2977.                 s->dsp.vc1_inv_trans_8x4(block, j);

  2978.         }

  2979.         break;

  2980.     case TT_4X8:

  2981.         for(j = 0; j < 2; j++) {

  2982.             last = subblkpat & (1 << (1 - j));

  2983.             i = 0;

  2984.             off = j * 4;

  2985.             while (!last) {

  2986.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2987.                 i += skip;

  2988.                 if(i > 31)

  2989.                     break;

  2990.                 if(v->profile < PROFILE_ADVANCED)

  2991.                     idx = ff_vc1_simple_progressive_4x8_zz[i++];

  2992.                 else

  2993.                     idx = ff_vc1_adv_progressive_4x8_zz[i++];

  2994.                 block[idx + off] = value * scale;

  2995.                 if(!v->pquantizer)

  2996.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2997.             }

  2998.             if(!(subblkpat & (1 << (1 - j))))

  2999.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3000.         }

  3001.         break;

  3002.     }

  3003.     return 0;

  3004. }

  3005. 

  3006. 

  3007. /** Decode one P-frame MB (in Simple/Main profile)

  3008.  */

  3009. static int vc1_decode_p_mb(VC1Context *v)

  3010. {

  3011.     MpegEncContext *s = &v->s;

  3012.     GetBitContext *gb = &s->gb;

  3013.     int i, j;

  3014.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3015.     int cbp; /* cbp decoding stuff */

  3016.     int mqdiff, mquant; /* MB quantization */

  3017.     int ttmb = v->ttfrm; /* MB Transform type */

  3018.     int status;

  3019. 

  3020.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3021.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3022.     int mb_has_coeffs = 1; /* last_flag */

  3023.     int dmv_x, dmv_y; /* Differential MV components */

  3024.     int index, index1; /* LUT indices */

  3025.     int val, sign; /* temp values */

  3026.     int first_block = 1;

  3027.     int dst_idx, off;

  3028.     int skipped, fourmv;

  3029. 

  3030.     mquant = v->pq; /* Loosy initialization */

  3031. 

  3032.     if (v->mv_type_is_raw)

  3033.         fourmv = get_bits1(gb);

  3034.     else

  3035.         fourmv = v->mv_type_mb_plane[mb_pos];

  3036.     if (v->skip_is_raw)

  3037.         skipped = get_bits1(gb);

  3038.     else

  3039.         skipped = v->s.mbskip_table[mb_pos];

  3040. 

  3041.     s->dsp.clear_blocks(s->block[0]);

  3042. 

  3043.     if (!fourmv) /* 1MV mode */

  3044.     {

  3045.         if (!skipped)

  3046.         {

  3047.             GET_MVDATA(dmv_x, dmv_y);

  3048. 

  3049.             if (s->mb_intra) {

  3050.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3051.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3052.             }

  3053.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3054.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3055. 

  3056.             /* FIXME Set DC val for inter block ? */

  3057.             if (s->mb_intra && !mb_has_coeffs)

  3058.             {

  3059.                 GET_MQUANT();

  3060.                 s->ac_pred = get_bits1(gb);

  3061.                 cbp = 0;

  3062.             }

  3063.             else if (mb_has_coeffs)

  3064.             {

  3065.                 if (s->mb_intra) s->ac_pred = get_bits1(gb);

  3066.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3067.                 GET_MQUANT();

  3068.             }

  3069.             else

  3070.             {

  3071.                 mquant = v->pq;

  3072.                 cbp = 0;

  3073.             }

  3074.             s->current_picture.qscale_table[mb_pos] = mquant;

  3075. 

  3076.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3077.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3078.                                 VC1_TTMB_VLC_BITS, 2);

  3079.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3080.             dst_idx = 0;

  3081.             for (i=0; i<6; i++)

  3082.             {

  3083.                 s->dc_val[0][s->block_index[i]] = 0;

  3084.                 dst_idx += i >> 2;

  3085.                 val = ((cbp >> (5 - i)) & 1);

  3086.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3087.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3088.                 if(s->mb_intra) {

  3089.                     /* check if prediction blocks A and C are available */

  3090.                     v->a_avail = v->c_avail = 0;

  3091.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3092.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3093.                     if(i == 1 || i == 3 || s->mb_x)

  3094.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3095. 

  3096.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3097.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3098.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3099.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3100.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3101.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3102.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3103.                     if(v->pq >= 9 && v->overlap) {

  3104.                         if(v->c_avail)

  3105.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3106.                         if(v->a_avail)

  3107.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3108.                     }

  3109.                 } else if(val) {

  3110.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3111.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3112.                     first_block = 0;

  3113.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3114.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3115.                 }

  3116.             }

  3117.         }

  3118.         else //Skipped

  3119.         {

  3120.             s->mb_intra = 0;

  3121.             for(i = 0; i < 6; i++) {

  3122.                 v->mb_type[0][s->block_index[i]] = 0;

  3123.                 s->dc_val[0][s->block_index[i]] = 0;

  3124.             }

  3125.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3126.             s->current_picture.qscale_table[mb_pos] = 0;

  3127.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3128.             vc1_mc_1mv(v, 0);

  3129.             return 0;

  3130.         }

  3131.     } //1MV mode

  3132.     else //4MV mode

  3133.     {

  3134.         if (!skipped /* unskipped MB */)

  3135.         {

  3136.             int intra_count = 0, coded_inter = 0;

  3137.             int is_intra[6], is_coded[6];

  3138.             /* Get CBPCY */

  3139.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3140.             for (i=0; i<6; i++)

  3141.             {

  3142.                 val = ((cbp >> (5 - i)) & 1);

  3143.                 s->dc_val[0][s->block_index[i]] = 0;

  3144.                 s->mb_intra = 0;

  3145.                 if(i < 4) {

  3146.                     dmv_x = dmv_y = 0;

  3147.                     s->mb_intra = 0;

  3148.                     mb_has_coeffs = 0;

  3149.                     if(val) {

  3150.                         GET_MVDATA(dmv_x, dmv_y);

  3151.                     }

  3152.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3153.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3154.                     intra_count += s->mb_intra;

  3155.                     is_intra[i] = s->mb_intra;

  3156.                     is_coded[i] = mb_has_coeffs;

  3157.                 }

  3158.                 if(i&4){

  3159.                     is_intra[i] = (intra_count >= 3);

  3160.                     is_coded[i] = val;

  3161.                 }

  3162.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3163.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3164.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3165.             }

  3166.             // if there are no coded blocks then don't do anything more

  3167.             if(!intra_count && !coded_inter) return 0;

  3168.             dst_idx = 0;

  3169.             GET_MQUANT();

  3170.             s->current_picture.qscale_table[mb_pos] = mquant;

  3171.             /* test if block is intra and has pred */

  3172.             {

  3173.                 int intrapred = 0;

  3174.                 for(i=0; i<6; i++)

  3175.                     if(is_intra[i]) {

  3176.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3177.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3178.                             intrapred = 1;

  3179.                             break;

  3180.                         }

  3181.                     }

  3182.                 if(intrapred)s->ac_pred = get_bits1(gb);

  3183.                 else s->ac_pred = 0;

  3184.             }

  3185.             if (!v->ttmbf && coded_inter)

  3186.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3187.             for (i=0; i<6; i++)

  3188.             {

  3189.                 dst_idx += i >> 2;

  3190.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3191.                 s->mb_intra = is_intra[i];

  3192.                 if (is_intra[i]) {

  3193.                     /* check if prediction blocks A and C are available */

  3194.                     v->a_avail = v->c_avail = 0;

  3195.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3196.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3197.                     if(i == 1 || i == 3 || s->mb_x)

  3198.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3199. 

  3200.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3201.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3202.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3203.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3204.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3205.                     if(!v->res_fasttx && v->res_x8) for(j = 0; j < 64; j++) s->block[i][j] += 16;

  3206.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3207.                     if(v->pq >= 9 && v->overlap) {

  3208.                         if(v->c_avail)

  3209.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3210.                         if(v->a_avail)

  3211.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3212.                     }

  3213.                 } else if(is_coded[i]) {

  3214.                     status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3215.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3216.                     first_block = 0;

  3217.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3218.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3219.                 }

  3220.             }

  3221.             return status;

  3222.         }

  3223.         else //Skipped MB

  3224.         {

  3225.             s->mb_intra = 0;

  3226.             s->current_picture.qscale_table[mb_pos] = 0;

  3227.             for (i=0; i<6; i++) {

  3228.                 v->mb_type[0][s->block_index[i]] = 0;

  3229.                 s->dc_val[0][s->block_index[i]] = 0;

  3230.             }

  3231.             for (i=0; i<4; i++)

  3232.             {

  3233.                 vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);

  3234.                 vc1_mc_4mv_luma(v, i);

  3235.             }

  3236.             vc1_mc_4mv_chroma(v);

  3237.             s->current_picture.qscale_table[mb_pos] = 0;

  3238.             return 0;

  3239.         }

  3240.     }

  3241. 

  3242.     /* Should never happen */

  3243.     return -1;

  3244. }

  3245. 

  3246. /** Decode one B-frame MB (in Main profile)

  3247.  */

  3248. static void vc1_decode_b_mb(VC1Context *v)

  3249. {

  3250.     MpegEncContext *s = &v->s;

  3251.     GetBitContext *gb = &s->gb;

  3252.     int i, j;

  3253.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3254.     int cbp = 0; /* cbp decoding stuff */

  3255.     int mqdiff, mquant; /* MB quantization */

  3256.     int ttmb = v->ttfrm; /* MB Transform type */

  3257. 

  3258.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3259.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3260.     int mb_has_coeffs = 0; /* last_flag */

  3261.     int index, index1; /* LUT indices */

  3262.     int val, sign; /* temp values */

  3263.     int first_block = 1;

  3264.     int dst_idx, off;

  3265.     int skipped, direct;

  3266.     int dmv_x[2], dmv_y[2];

  3267.     int bmvtype = BMV_TYPE_BACKWARD;

  3268. 

  3269.     mquant = v->pq; /* Loosy initialization */

  3270.     s->mb_intra = 0;

  3271. 

  3272.     if (v->dmb_is_raw)

  3273.         direct = get_bits1(gb);

  3274.     else

  3275.         direct = v->direct_mb_plane[mb_pos];

  3276.     if (v->skip_is_raw)

  3277.         skipped = get_bits1(gb);

  3278.     else

  3279.         skipped = v->s.mbskip_table[mb_pos];

  3280. 

  3281.     s->dsp.clear_blocks(s->block[0]);

  3282.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  3283.     for(i = 0; i < 6; i++) {

  3284.         v->mb_type[0][s->block_index[i]] = 0;

  3285.         s->dc_val[0][s->block_index[i]] = 0;

  3286.     }

  3287.     s->current_picture.qscale_table[mb_pos] = 0;

  3288. 

  3289.     if (!direct) {

  3290.         if (!skipped) {

  3291.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  3292.             dmv_x[1] = dmv_x[0];

  3293.             dmv_y[1] = dmv_y[0];

  3294.         }

  3295.         if(skipped || !s->mb_intra) {

  3296.             bmvtype = decode012(gb);

  3297.             switch(bmvtype) {

  3298.             case 0:

  3299.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  3300.                 break;

  3301.             case 1:

  3302.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  3303.                 break;

  3304.             case 2:

  3305.                 bmvtype = BMV_TYPE_INTERPOLATED;

  3306.                 dmv_x[0] = dmv_y[0] = 0;

  3307.             }

  3308.         }

  3309.     }

  3310.     for(i = 0; i < 6; i++)

  3311.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3312. 

  3313.     if (skipped) {

  3314.         if(direct) bmvtype = BMV_TYPE_INTERPOLATED;

  3315.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3316.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3317.         return;

  3318.     }

  3319.     if (direct) {

  3320.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3321.         GET_MQUANT();

  3322.         s->mb_intra = 0;

  3323.         mb_has_coeffs = 0;

  3324.         s->current_picture.qscale_table[mb_pos] = mquant;

  3325.         if(!v->ttmbf)

  3326.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3327.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  3328.         vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3329.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3330.     } else {

  3331.         if(!mb_has_coeffs && !s->mb_intra) {

  3332.             /* no coded blocks - effectively skipped */

  3333.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3334.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3335.             return;

  3336.         }

  3337.         if(s->mb_intra && !mb_has_coeffs) {

  3338.             GET_MQUANT();

  3339.             s->current_picture.qscale_table[mb_pos] = mquant;

  3340.             s->ac_pred = get_bits1(gb);

  3341.             cbp = 0;

  3342.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3343.         } else {

  3344.             if(bmvtype == BMV_TYPE_INTERPOLATED) {

  3345.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  3346.                 if(!mb_has_coeffs) {

  3347.                     /* interpolated skipped block */

  3348.                     vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3349.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3350.                     return;

  3351.                 }

  3352.             }

  3353.             vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  3354.             if(!s->mb_intra) {

  3355.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  3356.             }

  3357.             if(s->mb_intra)

  3358.                 s->ac_pred = get_bits1(gb);

  3359.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3360.             GET_MQUANT();

  3361.             s->current_picture.qscale_table[mb_pos] = mquant;

  3362.             if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3363.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3364.         }

  3365.     }

  3366.     dst_idx = 0;

  3367.     for (i=0; i<6; i++)

  3368.     {

  3369.         s->dc_val[0][s->block_index[i]] = 0;

  3370.         dst_idx += i >> 2;

  3371.         val = ((cbp >> (5 - i)) & 1);

  3372.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3373.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3374.         if(s->mb_intra) {

  3375.             /* check if prediction blocks A and C are available */

  3376.             v->a_avail = v->c_avail = 0;

  3377.             if(i == 2 || i == 3 || !s->first_slice_line)

  3378.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3379.             if(i == 1 || i == 3 || s->mb_x)

  3380.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3381. 

  3382.             vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3383.             if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3384.             s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3385.             if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3386.             for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3387.             s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3388.         } else if(val) {

  3389.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3390.             if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3391.             first_block = 0;

  3392.             if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3393.                 s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3394.         }

  3395.     }

  3396. }

  3397. 

  3398. /** Decode blocks of I-frame

  3399.  */

  3400. static void vc1_decode_i_blocks(VC1Context *v)

  3401. {

  3402.     int k, j;

  3403.     MpegEncContext *s = &v->s;

  3404.     int cbp, val;

  3405.     uint8_t *coded_val;

  3406.     int mb_pos;

  3407. 

  3408.     /* select codingmode used for VLC tables selection */

  3409.     switch(v->y_ac_table_index){

  3410.     case 0:

  3411.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3412.         break;

  3413.     case 1:

  3414.         v->codingset = CS_HIGH_MOT_INTRA;

  3415.         break;

  3416.     case 2:

  3417.         v->codingset = CS_MID_RATE_INTRA;

  3418.         break;

  3419.     }

  3420. 

  3421.     switch(v->c_ac_table_index){

  3422.     case 0:

  3423.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3424.         break;

  3425.     case 1:

  3426.         v->codingset2 = CS_HIGH_MOT_INTER;

  3427.         break;

  3428.     case 2:

  3429.         v->codingset2 = CS_MID_RATE_INTER;

  3430.         break;

  3431.     }

  3432. 

  3433.     /* Set DC scale - y and c use the same */

  3434.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  3435.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  3436. 

  3437.     //do frame decode

  3438.     s->mb_x = s->mb_y = 0;

  3439.     s->mb_intra = 1;

  3440.     s->first_slice_line = 1;

  3441.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3442.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3443.             ff_init_block_index(s);

  3444.             ff_update_block_index(s);

  3445.             s->dsp.clear_blocks(s->block[0]);

  3446.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  3447.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3448.             s->current_picture.qscale_table[mb_pos] = v->pq;

  3449.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3450.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3451. 

  3452.             // do actual MB decoding and displaying

  3453.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3454.             v->s.ac_pred = get_bits1(&v->s.gb);

  3455. 

  3456.             for(k = 0; k < 6; k++) {

  3457.                 val = ((cbp >> (5 - k)) & 1);

  3458. 

  3459.                 if (k < 4) {

  3460.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3461.                     val = val ^ pred;

  3462.                     *coded_val = val;

  3463.                 }

  3464.                 cbp |= val << (5 - k);

  3465. 

  3466.                 vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

  3467. 

  3468.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3469.                 if(!v->res_fasttx && !v->res_x8) for(j = 0; j < 64; j++) s->block[k][j] -= 16;

  3470.                 if(v->pq >= 9 && v->overlap) {

  3471.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3472.                 }

  3473.             }

  3474. 

  3475.             vc1_put_block(v, s->block);

  3476.             if(v->pq >= 9 && v->overlap) {

  3477.                 if(s->mb_x) {

  3478.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3479.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3480.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3481.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3482.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3483.                     }

  3484.                 }

  3485.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3486.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3487.                 if(!s->first_slice_line) {

  3488.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3489.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3490.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3491.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3492.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3493.                     }

  3494.                 }

  3495.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3496.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3497.             }

  3498. 

  3499.             if(get_bits_count(&s->gb) > v->bits) {

  3500.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3501.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3502.                 return;

  3503.             }

  3504.         }

  3505.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3506.         s->first_slice_line = 0;

  3507.     }

  3508.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3509. }

  3510. 

  3511. /** Decode blocks of I-frame for advanced profile

  3512.  */

  3513. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3514. {

  3515.     int k, j;

  3516.     MpegEncContext *s = &v->s;

  3517.     int cbp, val;

  3518.     uint8_t *coded_val;

  3519.     int mb_pos;

  3520.     int mquant = v->pq;

  3521.     int mqdiff;

  3522.     int overlap;

  3523.     GetBitContext *gb = &s->gb;

  3524. 

  3525.     /* select codingmode used for VLC tables selection */

  3526.     switch(v->y_ac_table_index){

  3527.     case 0:

  3528.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3529.         break;

  3530.     case 1:

  3531.         v->codingset = CS_HIGH_MOT_INTRA;

  3532.         break;

  3533.     case 2:

  3534.         v->codingset = CS_MID_RATE_INTRA;

  3535.         break;

  3536.     }

  3537. 

  3538.     switch(v->c_ac_table_index){

  3539.     case 0:

  3540.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3541.         break;

  3542.     case 1:

  3543.         v->codingset2 = CS_HIGH_MOT_INTER;

  3544.         break;

  3545.     case 2:

  3546.         v->codingset2 = CS_MID_RATE_INTER;

  3547.         break;

  3548.     }

  3549. 

  3550.     //do frame decode

  3551.     s->mb_x = s->mb_y = 0;

  3552.     s->mb_intra = 1;

  3553.     s->first_slice_line = 1;

  3554.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3555.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3556.             ff_init_block_index(s);

  3557.             ff_update_block_index(s);

  3558.             s->dsp.clear_blocks(s->block[0]);

  3559.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3560.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3561.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3562.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3563. 

  3564.             // do actual MB decoding and displaying

  3565.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3566.             if(v->acpred_is_raw)

  3567.                 v->s.ac_pred = get_bits1(&v->s.gb);

  3568.             else

  3569.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3570. 

  3571.             if(v->condover == CONDOVER_SELECT) {

  3572.                 if(v->overflg_is_raw)

  3573.                     overlap = get_bits1(&v->s.gb);

  3574.                 else

  3575.                     overlap = v->over_flags_plane[mb_pos];

  3576.             } else

  3577.                 overlap = (v->condover == CONDOVER_ALL);

  3578. 

  3579.             GET_MQUANT();

  3580. 

  3581.             s->current_picture.qscale_table[mb_pos] = mquant;

  3582.             /* Set DC scale - y and c use the same */

  3583.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3584.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3585. 

  3586.             for(k = 0; k < 6; k++) {

  3587.                 val = ((cbp >> (5 - k)) & 1);

  3588. 

  3589.                 if (k < 4) {

  3590.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3591.                     val = val ^ pred;

  3592.                     *coded_val = val;

  3593.                 }

  3594.                 cbp |= val << (5 - k);

  3595. 

  3596.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3597.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3598. 

  3599.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3600. 

  3601.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3602.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3603.             }

  3604. 

  3605.             vc1_put_block(v, s->block);

  3606.             if(overlap) {

  3607.                 if(s->mb_x) {

  3608.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3609.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3610.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3611.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3612.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3613.                     }

  3614.                 }

  3615.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3616.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3617.                 if(!s->first_slice_line) {

  3618.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3619.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3620.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3621.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3622.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3623.                     }

  3624.                 }

  3625.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3626.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3627.             }

  3628. 

  3629.             if(get_bits_count(&s->gb) > v->bits) {

  3630.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3631.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3632.                 return;

  3633.             }

  3634.         }

  3635.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3636.         s->first_slice_line = 0;

  3637.     }

  3638.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3639. }

  3640. 

  3641. static void vc1_decode_p_blocks(VC1Context *v)

  3642. {

  3643.     MpegEncContext *s = &v->s;

  3644. 

  3645.     /* select codingmode used for VLC tables selection */

  3646.     switch(v->c_ac_table_index){

  3647.     case 0:

  3648.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3649.         break;

  3650.     case 1:

  3651.         v->codingset = CS_HIGH_MOT_INTRA;

  3652.         break;

  3653.     case 2:

  3654.         v->codingset = CS_MID_RATE_INTRA;

  3655.         break;

  3656.     }

  3657. 

  3658.     switch(v->c_ac_table_index){

  3659.     case 0:

  3660.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3661.         break;

  3662.     case 1:

  3663.         v->codingset2 = CS_HIGH_MOT_INTER;

  3664.         break;

  3665.     case 2:

  3666.         v->codingset2 = CS_MID_RATE_INTER;

  3667.         break;

  3668.     }

  3669. 

  3670.     s->first_slice_line = 1;

  3671.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3672.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3673.             ff_init_block_index(s);

  3674.             ff_update_block_index(s);

  3675.             s->dsp.clear_blocks(s->block[0]);

  3676. 

  3677.             vc1_decode_p_mb(v);

  3678.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3679.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3680.                 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);

  3681.                 return;

  3682.             }

  3683.         }

  3684.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3685.         s->first_slice_line = 0;

  3686.     }

  3687.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3688. }

  3689. 

  3690. static void vc1_decode_b_blocks(VC1Context *v)

  3691. {

  3692.     MpegEncContext *s = &v->s;

  3693. 

  3694.     /* select codingmode used for VLC tables selection */

  3695.     switch(v->c_ac_table_index){

  3696.     case 0:

  3697.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3698.         break;

  3699.     case 1:

  3700.         v->codingset = CS_HIGH_MOT_INTRA;

  3701.         break;

  3702.     case 2:

  3703.         v->codingset = CS_MID_RATE_INTRA;

  3704.         break;

  3705.     }

  3706. 

  3707.     switch(v->c_ac_table_index){

  3708.     case 0:

  3709.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3710.         break;

  3711.     case 1:

  3712.         v->codingset2 = CS_HIGH_MOT_INTER;

  3713.         break;

  3714.     case 2:

  3715.         v->codingset2 = CS_MID_RATE_INTER;

  3716.         break;

  3717.     }

  3718. 

  3719.     s->first_slice_line = 1;

  3720.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3721.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3722.             ff_init_block_index(s);

  3723.             ff_update_block_index(s);

  3724.             s->dsp.clear_blocks(s->block[0]);

  3725. 

  3726.             vc1_decode_b_mb(v);

  3727.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3728.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3729.                 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);

  3730.                 return;

  3731.             }

  3732.         }

  3733.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3734.         s->first_slice_line = 0;

  3735.     }

  3736.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3737. }

  3738. 

  3739. static void vc1_decode_skip_blocks(VC1Context *v)

  3740. {

  3741.     MpegEncContext *s = &v->s;

  3742. 

  3743.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3744.     s->first_slice_line = 1;

  3745.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3746.         s->mb_x = 0;

  3747.         ff_init_block_index(s);

  3748.         ff_update_block_index(s);

  3749.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  3750.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3751.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3752.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3753.         s->first_slice_line = 0;

  3754.     }

  3755.     s->pict_type = P_TYPE;

  3756. }

  3757. 

  3758. static void vc1_decode_blocks(VC1Context *v)

  3759. {

  3760. 

  3761.     v->s.esc3_level_length = 0;

  3762. 

  3763.     switch(v->s.pict_type) {

  3764.     case I_TYPE:

  3765.         if(v->profile == PROFILE_ADVANCED)

  3766.             vc1_decode_i_blocks_adv(v);

  3767.         else

  3768.             vc1_decode_i_blocks(v);

  3769.         break;

  3770.     case P_TYPE:

  3771.         if(v->p_frame_skipped)

  3772.             vc1_decode_skip_blocks(v);

  3773.         else

  3774.             vc1_decode_p_blocks(v);

  3775.         break;

  3776.     case B_TYPE:

  3777.         if(v->bi_type){

  3778.             if(v->profile == PROFILE_ADVANCED)

  3779.                 vc1_decode_i_blocks_adv(v);

  3780.             else

  3781.                 vc1_decode_i_blocks(v);

  3782.         }else

  3783.             vc1_decode_b_blocks(v);

  3784.         break;

  3785.     }

  3786. }

  3787. 

  3788. /** Find VC-1 marker in buffer

  3789.  * @return position where next marker starts or end of buffer if no marker found

  3790.  */

  3791. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  3792. {

  3793.     uint32_t mrk = 0xFFFFFFFF;

  3794. 

  3795.     if(end-src < 4) return end;

  3796.     while(src < end){

  3797.         mrk = (mrk << 8) | *src++;

  3798.         if(IS_MARKER(mrk))

  3799.             return src-4;

  3800.     }

  3801.     return end;

  3802. }

  3803. 

  3804. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  3805. {

  3806.     int dsize = 0, i;

  3807. 

  3808.     if(size < 4){

  3809.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  3810.         return size;

  3811.     }

  3812.     for(i = 0; i < size; i++, src++) {

  3813.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  3814.             dst[dsize++] = src[1];

  3815.             src++;

  3816.             i++;

  3817.         } else

  3818.             dst[dsize++] = *src;

  3819.     }

  3820.     return dsize;

  3821. }

  3822. 

  3823. /** Initialize a VC1/WMV3 decoder

  3824.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3825.  * @todo TODO: Decypher remaining bits in extra_data

  3826.  */

  3827. static int vc1_decode_init(AVCodecContext *avctx)

  3828. {

  3829.     VC1Context *v = avctx->priv_data;

  3830.     MpegEncContext *s = &v->s;

  3831.     GetBitContext gb;

  3832. 

  3833.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3834.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3835.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3836.     else

  3837.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3838.     v->s.avctx = avctx;

  3839.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3840.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3841. 

  3842.     if(ff_h263_decode_init(avctx) < 0)

  3843.         return -1;

  3844.     if (vc1_init_common(v) < 0) return -1;

  3845. 

  3846.     avctx->coded_width = avctx->width;

  3847.     avctx->coded_height = avctx->height;

  3848.     if (avctx->codec_id == CODEC_ID_WMV3)

  3849.     {

  3850.         int count = 0;

  3851. 

  3852.         // looks like WMV3 has a sequence header stored in the extradata

  3853.         // advanced sequence header may be before the first frame

  3854.         // the last byte of the extradata is a version number, 1 for the

  3855.         // samples we can decode

  3856. 

  3857.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3858. 

  3859.         if (decode_sequence_header(avctx, &gb) < 0)

  3860.           return -1;

  3861. 

  3862.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3863.         if (count>0)

  3864.         {

  3865.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3866.                    count, get_bits(&gb, count));

  3867.         }

  3868.         else if (count < 0)

  3869.         {

  3870.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3871.         }

  3872.     } else { // VC1/WVC1

  3873.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  3874.         uint8_t *next; int size, buf2_size;

  3875.         uint8_t *buf2 = NULL;

  3876.         int seq_inited = 0, ep_inited = 0;

  3877. 

  3878.         if(avctx->extradata_size < 16) {

  3879.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  3880.             return -1;

  3881.         }

  3882. 

  3883.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3884.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  3885.         next = start;

  3886.         for(; next < end; start = next){

  3887.             next = find_next_marker(start + 4, end);

  3888.             size = next - start - 4;

  3889.             if(size <= 0) continue;

  3890.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  3891.             init_get_bits(&gb, buf2, buf2_size * 8);

  3892.             switch(AV_RB32(start)){

  3893.             case VC1_CODE_SEQHDR:

  3894.                 if(decode_sequence_header(avctx, &gb) < 0){

  3895.                     av_free(buf2);

  3896.                     return -1;

  3897.                 }

  3898.                 seq_inited = 1;

  3899.                 break;

  3900.             case VC1_CODE_ENTRYPOINT:

  3901.                 if(decode_entry_point(avctx, &gb) < 0){

  3902.                     av_free(buf2);

  3903.                     return -1;

  3904.                 }

  3905.                 ep_inited = 1;

  3906.                 break;

  3907.             }

  3908.         }

  3909.         av_free(buf2);

  3910.         if(!seq_inited || !ep_inited){

  3911.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  3912.             return -1;

  3913.         }

  3914.     }

  3915.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3916.     s->low_delay = !avctx->has_b_frames;

  3917. 

  3918.     s->mb_width = (avctx->coded_width+15)>>4;

  3919.     s->mb_height = (avctx->coded_height+15)>>4;

  3920. 

  3921.     /* Allocate mb bitplanes */

  3922.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3923.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3924.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  3925.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  3926. 

  3927.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3928.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3929.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3930.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3931.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3932. 

  3933.     /* Init coded blocks info */

  3934.     if (v->profile == PROFILE_ADVANCED)

  3935.     {

  3936. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3937. //            return -1;

  3938. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3939. //            return -1;

  3940.     }

  3941. 

  3942.     return 0;

  3943. }

  3944. 

  3945. 

  3946. /** Decode a VC1/WMV3 frame

  3947.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3948.  */

  3949. static int vc1_decode_frame(AVCodecContext *avctx,

  3950.                             void *data, int *data_size,

  3951.                             uint8_t *buf, int buf_size)

  3952. {

  3953.     VC1Context *v = avctx->priv_data;

  3954.     MpegEncContext *s = &v->s;

  3955.     AVFrame *pict = data;

  3956.     uint8_t *buf2 = NULL;

  3957. 

  3958.     /* no supplementary picture */

  3959.     if (buf_size == 0) {

  3960.         /* special case for last picture */

  3961.         if (s->low_delay==0 && s->next_picture_ptr) {

  3962.             *pict= *(AVFrame*)s->next_picture_ptr;

  3963.             s->next_picture_ptr= NULL;

  3964. 

  3965.             *data_size = sizeof(AVFrame);

  3966.         }

  3967. 

  3968.         return 0;

  3969.     }

  3970. 

  3971.     /* We need to set current_picture_ptr before reading the header,

  3972.      * otherwise we cannot store anything in there. */

  3973.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  3974.         int i= ff_find_unused_picture(s, 0);

  3975.         s->current_picture_ptr= &s->picture[i];

  3976.     }

  3977. 

  3978.     //for advanced profile we may need to parse and unescape data

  3979.     if (avctx->codec_id == CODEC_ID_VC1) {

  3980.         int buf_size2 = 0;

  3981.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3982. 

  3983.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  3984.             uint8_t *start, *end, *next;

  3985.             int size;

  3986. 

  3987.             next = buf;

  3988.             for(start = buf, end = buf + buf_size; next < end; start = next){

  3989.                 next = find_next_marker(start + 4, end);

  3990.                 size = next - start - 4;

  3991.                 if(size <= 0) continue;

  3992.                 switch(AV_RB32(start)){

  3993.                 case VC1_CODE_FRAME:

  3994.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  3995.                     break;

  3996.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  3997.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  3998.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  3999.                     decode_entry_point(avctx, &s->gb);

  4000.                     break;

  4001.                 case VC1_CODE_SLICE:

  4002.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4003.                     av_free(buf2);

  4004.                     return -1;

  4005.                 }

  4006.             }

  4007.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4008.             uint8_t *divider;

  4009. 

  4010.             divider = find_next_marker(buf, buf + buf_size);

  4011.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4012.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4013.                 return -1;

  4014.             }

  4015. 

  4016.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4017.             // TODO

  4018.             av_free(buf2);return -1;

  4019.         }else{

  4020.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4021.         }

  4022.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4023.     } else

  4024.         init_get_bits(&s->gb, buf, buf_size*8);

  4025.     // do parse frame header

  4026.     if(v->profile < PROFILE_ADVANCED) {

  4027.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4028.             av_free(buf2);

  4029.             return -1;

  4030.         }

  4031.     } else {

  4032.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4033.             av_free(buf2);

  4034.             return -1;

  4035.         }

  4036.     }

  4037. 

  4038.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4039.         av_free(buf2);

  4040.         return -1;

  4041.     }

  4042. 

  4043.     // for hurry_up==5

  4044.     s->current_picture.pict_type= s->pict_type;

  4045.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4046. 

  4047.     /* skip B-frames if we don't have reference frames */

  4048.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4049.         av_free(buf2);

  4050.         return -1;//buf_size;

  4051.     }

  4052.     /* skip b frames if we are in a hurry */

  4053.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4054.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4055.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4056.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4057.         av_free(buf2);

  4058.         return buf_size;

  4059.     }

  4060.     /* skip everything if we are in a hurry>=5 */

  4061.     if(avctx->hurry_up>=5) {

  4062.         av_free(buf2);

  4063.         return -1;//buf_size;

  4064.     }

  4065. 

  4066.     if(s->next_p_frame_damaged){

  4067.         if(s->pict_type==B_TYPE)

  4068.             return buf_size;

  4069.         else

  4070.             s->next_p_frame_damaged=0;

  4071.     }

  4072. 

  4073.     if(MPV_frame_start(s, avctx) < 0) {

  4074.         av_free(buf2);

  4075.         return -1;

  4076.     }

  4077. 

  4078.     s->me.qpel_put= s->dsp.put_qpel_pixels_tab;

  4079.     s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;

  4080. 

  4081.     ff_er_frame_start(s);

  4082. 

  4083.     v->bits = buf_size * 8;

  4084.     vc1_decode_blocks(v);

  4085. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4086. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4087. //      return -1;

  4088.     ff_er_frame_end(s);

  4089. 

  4090.     MPV_frame_end(s);

  4091. 

  4092. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4093. assert(s->current_picture.pict_type == s->pict_type);

  4094.     if (s->pict_type == B_TYPE || s->low_delay) {

  4095.         *pict= *(AVFrame*)s->current_picture_ptr;

  4096.     } else if (s->last_picture_ptr != NULL) {

  4097.         *pict= *(AVFrame*)s->last_picture_ptr;

  4098.     }

  4099. 

  4100.     if(s->last_picture_ptr || s->low_delay){

  4101.         *data_size = sizeof(AVFrame);

  4102.         ff_print_debug_info(s, pict);

  4103.     }

  4104. 

  4105.     /* Return the Picture timestamp as the frame number */

  4106.     /* we substract 1 because it is added on utils.c    */

  4107.     avctx->frame_number = s->picture_number - 1;

  4108. 

  4109.     av_free(buf2);

  4110.     return buf_size;

  4111. }

  4112. 

  4113. 

  4114. /** Close a VC1/WMV3 decoder

  4115.  * @warning Initial try at using MpegEncContext stuff

  4116.  */

  4117. static int vc1_decode_end(AVCodecContext *avctx)

  4118. {

  4119.     VC1Context *v = avctx->priv_data;

  4120. 

  4121.     av_freep(&v->hrd_rate);

  4122.     av_freep(&v->hrd_buffer);

  4123.     MPV_common_end(&v->s);

  4124.     av_freep(&v->mv_type_mb_plane);

  4125.     av_freep(&v->direct_mb_plane);

  4126.     av_freep(&v->acpred_plane);

  4127.     av_freep(&v->over_flags_plane);

  4128.     av_freep(&v->mb_type_base);

  4129.     return 0;

  4130. }

  4131. 

  4132. 

  4133. AVCodec vc1_decoder = {

  4134.     "vc1",

  4135.     CODEC_TYPE_VIDEO,

  4136.     CODEC_ID_VC1,

  4137.     sizeof(VC1Context),

  4138.     vc1_decode_init,

  4139.     NULL,

  4140.     vc1_decode_end,

  4141.     vc1_decode_frame,

  4142.     CODEC_CAP_DELAY,

  4143.     NULL

  4144. };

  4145. 

  4146. AVCodec wmv3_decoder = {

  4147.     "wmv3",

  4148.     CODEC_TYPE_VIDEO,

  4149.     CODEC_ID_WMV3,

  4150.     sizeof(VC1Context),

  4151.     vc1_decode_init,

  4152.     NULL,

  4153.     vc1_decode_end,

  4154.     vc1_decode_frame,

  4155.     CODEC_CAP_DELAY,

  4156.     NULL

  4157. };