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FFmpeg/libavcodec/vc1.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

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

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

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file vc1.c

  25.  * VC-1 and WMV3 decoder

  26.  *

  27.  */

  28. #include "dsputil.h"

  29. #include "avcodec.h"

  30. #include "mpegvideo.h"

  31. #include "vc1.h"

  32. #include "vc1data.h"

  33. #include "vc1acdata.h"

  34. #include "msmpeg4data.h"

  35. #include "unary.h"

  36. #include "simple_idct.h"

  37. 

  38. #undef NDEBUG

  39. #include <assert.h>

  40. 

  41. #define MB_INTRA_VLC_BITS 9

  42. #define DC_VLC_BITS 9

  43. #define AC_VLC_BITS 9

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

  45. 

  46. 

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

  48.     if (get_bits1(gb))

  49.         return 0;

  50.     else

  51.         return 2 - get_bits1(gb);

  52. }

  53. 

  54. /**

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

  56.  * @param v The VC1Context to initialize

  57.  * @return Status

  58.  */

  59. static int vc1_init_common(VC1Context *v)

  60. {

  61.     static int done = 0;

  62.     int i = 0;

  63. 

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

  65. 

  66.     /* VLC tables */

  67.     if(!done)

  68.     {

  69.         done = 1;

  70.         init_vlc(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,

  71.                  ff_vc1_bfraction_bits, 1, 1,

  72.                  ff_vc1_bfraction_codes, 1, 1, 1);

  73.         init_vlc(&ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,

  74.                  ff_vc1_norm2_bits, 1, 1,

  75.                  ff_vc1_norm2_codes, 1, 1, 1);

  76.         init_vlc(&ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,

  77.                  ff_vc1_norm6_bits, 1, 1,

  78.                  ff_vc1_norm6_codes, 2, 2, 1);

  79.         init_vlc(&ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,

  80.                  ff_vc1_imode_bits, 1, 1,

  81.                  ff_vc1_imode_codes, 1, 1, 1);

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

  83.         {

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

  85.                      ff_vc1_ttmb_bits[i], 1, 1,

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

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

  88.                      ff_vc1_ttblk_bits[i], 1, 1,

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

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

  91.                      ff_vc1_subblkpat_bits[i], 1, 1,

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

  93.         }

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

  95.         {

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

  97.                      ff_vc1_4mv_block_pattern_bits[i], 1, 1,

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

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

  100.                      ff_vc1_cbpcy_p_bits[i], 1, 1,

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

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

  103.                      ff_vc1_mv_diff_bits[i], 1, 1,

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

  105.         }

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

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

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

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

  110.         init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  113.     }

  114. 

  115.     /* Other defaults */

  116.     v->pq = -1;

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

  118. 

  119.     return 0;

  120. }

  121. 

  122. /***********************************************************************/

  123. /**

  124.  * @defgroup bitplane VC9 Bitplane decoding

  125.  * @see 8.7, p56

  126.  * @{

  127.  */

  128. 

  129. /** @addtogroup bitplane

  130.  * Imode types

  131.  * @{

  132.  */

  133. enum Imode {

  134.     IMODE_RAW,

  135.     IMODE_NORM2,

  136.     IMODE_DIFF2,

  137.     IMODE_NORM6,

  138.     IMODE_DIFF6,

  139.     IMODE_ROWSKIP,

  140.     IMODE_COLSKIP

  141. };

  142. /** @} */ //imode defines

  143. 

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

  145.  * @param plane Buffer to store decoded bits

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

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

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

  149.  */

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

  151.     int x, y;

  152. 

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

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

  155.             memset(plane, 0, width);

  156.         else

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

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

  159.         plane += stride;

  160.     }

  161. }

  162. 

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

  164.  * @param plane Buffer to store decoded bits

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

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

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

  168.  * @todo FIXME: Optimize

  169.  */

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

  171.     int x, y;

  172. 

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

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

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

  176.                 plane[y*stride] = 0;

  177.         else

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

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

  180.         plane ++;

  181.     }

  182. }

  183. 

  184. /** Decode a bitplane's bits

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

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

  187.  * @return Status

  188.  * @todo FIXME: Optimize

  189.  */

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

  191. {

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

  193. 

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

  195.     uint8_t invert, *planep = data;

  196.     int width, height, stride;

  197. 

  198.     width = v->s.mb_width;

  199.     height = v->s.mb_height;

  200.     stride = v->s.mb_stride;

  201.     invert = get_bits1(gb);

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

  203. 

  204.     *raw_flag = 0;

  205.     switch (imode)

  206.     {

  207.     case IMODE_RAW:

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

  209.         *raw_flag = 1; //invert ignored

  210.         return invert;

  211.     case IMODE_DIFF2:

  212.     case IMODE_NORM2:

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

  214.         {

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

  216.             offset = 1;

  217.         }

  218.         else offset = 0;

  219.         // decode bitplane as one long line

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

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

  222.             *planep++ = code & 1;

  223.             offset++;

  224.             if(offset == width) {

  225.                 offset = 0;

  226.                 planep += stride - width;

  227.             }

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

  229.             offset++;

  230.             if(offset == width) {

  231.                 offset = 0;

  232.                 planep += stride - width;

  233.             }

  234.         }

  235.         break;

  236.     case IMODE_DIFF6:

  237.     case IMODE_NORM6:

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

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

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

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

  242.                     if(code < 0){

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

  244.                         return -1;

  245.                     }

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

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

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

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

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

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

  252.                 }

  253.                 planep += stride * 3;

  254.             }

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

  256.         } else { // 3x2

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

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

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

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

  261.                     if(code < 0){

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

  263.                         return -1;

  264.                     }

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

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

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

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

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

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

  271.                 }

  272.                 planep += stride * 2;

  273.             }

  274.             x = width % 3;

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

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

  277.         }

  278.         break;

  279.     case IMODE_ROWSKIP:

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

  281.         break;

  282.     case IMODE_COLSKIP:

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

  284.         break;

  285.     default: break;

  286.     }

  287. 

  288.     /* Applying diff operator */

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

  290.     {

  291.         planep = data;

  292.         planep[0] ^= invert;

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

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

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

  296.         {

  297.             planep += stride;

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

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

  300.             {

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

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

  303.             }

  304.         }

  305.     }

  306.     else if (invert)

  307.     {

  308.         planep = data;

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

  310.     }

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

  312. }

  313. 

  314. /** @} */ //Bitplane group

  315. 

  316. /***********************************************************************/

  317. /** VOP Dquant decoding

  318.  * @param v VC-1 Context

  319.  */

  320. static int vop_dquant_decoding(VC1Context *v)

  321. {

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

  323.     int pqdiff;

  324. 

  325.     //variable size

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

  327.     {

  328.         pqdiff = get_bits(gb, 3);

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

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

  331.     }

  332.     else

  333.     {

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

  335.         if ( v->dquantfrm )

  336.         {

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

  338.             switch (v->dqprofile)

  339.             {

  340.             case DQPROFILE_SINGLE_EDGE:

  341.             case DQPROFILE_DOUBLE_EDGES:

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

  343.                 break;

  344.             case DQPROFILE_ALL_MBS:

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

  346.                 if(!v->dqbilevel)

  347.                     v->halfpq = 0;

  348.             default: break; //Forbidden ?

  349.             }

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

  351.             {

  352.                 pqdiff = get_bits(gb, 3);

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

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

  355.             }

  356.         }

  357.     }

  358.     return 0;

  359. }

  360. 

  361. /** Put block onto picture

  362.  */

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

  364. {

  365.     uint8_t *Y;

  366.     int ys, us, vs;

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

  368. 

  369.     if(v->rangeredfrm) {

  370.         int i, j, k;

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

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

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

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

  375. 

  376.     }

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

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

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

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

  381. 

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

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

  384.     Y += ys * 8;

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

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

  387. 

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

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

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

  391.     }

  392. }

  393. 

  394. /** Do motion compensation over 1 macroblock

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

  396.  */

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

  398. {

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

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

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

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

  403. 

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

  405. 

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

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

  408. 

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

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

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

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

  413.     }

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

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

  416.     if(v->fastuvmc) {

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

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

  419.     }

  420.     if(!dir) {

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

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

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

  424.     } else {

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

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

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

  428.     }

  429. 

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

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

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

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

  434. 

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

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

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

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

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

  440.     }else{

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

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

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

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

  445.     }

  446. 

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

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

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

  450. 

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

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

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

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

  455.     }

  456. 

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

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

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

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

  461. 

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

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

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

  465.         srcY = s->edge_emu_buffer;

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

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

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

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

  470.         srcU = uvbuf;

  471.         srcV = uvbuf + 16;

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

  473.         if(v->rangeredfrm) {

  474.             int i, j;

  475.             uint8_t *src, *src2;

  476. 

  477.             src = srcY;

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

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

  480.                 src += s->linesize;

  481.             }

  482.             src = srcU; src2 = srcV;

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

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

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

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

  487.                 }

  488.                 src += s->uvlinesize;

  489.                 src2 += s->uvlinesize;

  490.             }

  491.         }

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

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

  494.             int i, j;

  495.             uint8_t *src, *src2;

  496. 

  497.             src = srcY;

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

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

  500.                 src += s->linesize;

  501.             }

  502.             src = srcU; src2 = srcV;

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

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

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

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

  507.                 }

  508.                 src += s->uvlinesize;

  509.                 src2 += s->uvlinesize;

  510.             }

  511.         }

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

  513.     }

  514. 

  515.     if(s->mspel) {

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

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

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

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

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

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

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

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

  524. 

  525.         if(!v->rnd)

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

  527.         else

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

  529.     }

  530. 

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

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

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

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

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

  536.     if(!v->rnd){

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

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

  539.     }else{

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

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

  542.     }

  543. }

  544. 

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

  546.  */

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

  548. {

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

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

  551.     uint8_t *srcY;

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

  553.     int off;

  554. 

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

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

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

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

  559. 

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

  561. 

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

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

  564. 

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

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

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

  568.     }else{

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

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

  571.     }

  572. 

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

  574. 

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

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

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

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

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

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

  581.         srcY = s->edge_emu_buffer;

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

  583.         if(v->rangeredfrm) {

  584.             int i, j;

  585.             uint8_t *src;

  586. 

  587.             src = srcY;

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

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

  590.                 src += s->linesize;

  591.             }

  592.         }

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

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

  595.             int i, j;

  596.             uint8_t *src;

  597. 

  598.             src = srcY;

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

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

  601.                 src += s->linesize;

  602.             }

  603.         }

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

  605.     }

  606. 

  607.     if(s->mspel) {

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

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

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

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

  612.         if(!v->rnd)

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

  614.         else

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

  616.     }

  617. }

  618. 

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

  620. {

  621.     if(a < b) {

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

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

  624.     } else {

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

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

  627.     }

  628. }

  629. 

  630. 

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

  632.  */

  633. static void vc1_mc_4mv_chroma(VC1Context *v)

  634. {

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

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

  637.     uint8_t *srcU, *srcV;

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

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

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

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

  642. 

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

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

  645. 

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

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

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

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

  650.     }

  651. 

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

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

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

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

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

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

  658.         switch(idx) {

  659.         case 0x1:

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

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

  662.             break;

  663.         case 0x2:

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

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

  666.             break;

  667.         case 0x4:

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

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

  670.             break;

  671.         case 0x8:

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

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

  674.             break;

  675.         }

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

  677.         int t1 = 0, t2 = 0;

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

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

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

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

  682.     } else {

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

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

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

  686.     }

  687. 

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

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

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

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

  692.     if(v->fastuvmc) {

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

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

  695.     }

  696. 

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

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

  699. 

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

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

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

  703.     }else{

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

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

  706.     }

  707. 

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

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

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

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

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

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

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

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

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

  717.         srcU = s->edge_emu_buffer;

  718.         srcV = s->edge_emu_buffer + 16;

  719. 

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

  721.         if(v->rangeredfrm) {

  722.             int i, j;

  723.             uint8_t *src, *src2;

  724. 

  725.             src = srcU; src2 = srcV;

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

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

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

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

  730.                 }

  731.                 src += s->uvlinesize;

  732.                 src2 += s->uvlinesize;

  733.             }

  734.         }

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

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

  737.             int i, j;

  738.             uint8_t *src, *src2;

  739. 

  740.             src = srcU; src2 = srcV;

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

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

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

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

  745.                 }

  746.                 src += s->uvlinesize;

  747.                 src2 += s->uvlinesize;

  748.             }

  749.         }

  750.     }

  751. 

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

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

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

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

  756.     if(!v->rnd){

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

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

  759.     }else{

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

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

  762.     }

  763. }

  764. 

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

  766. 

  767. /**

  768.  * Decode Simple/Main Profiles sequence header

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

  770.  * @param avctx Codec context

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

  772.  * @return Status

  773.  */

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

  775. {

  776.     VC1Context *v = avctx->priv_data;

  777. 

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

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

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

  781.     {

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

  783.     }

  784. 

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

  786.     {

  787.         return decode_sequence_header_adv(v, gb);

  788.     }

  789.     else

  790.     {

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

  792.         if (v->res_sm)

  793.         {

  794.             av_log(avctx, AV_LOG_ERROR,

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

  796.             return -1;

  797.         }

  798.     }

  799. 

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

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

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

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

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

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

  806.     {

  807.         av_log(avctx, AV_LOG_ERROR,

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

  809.     }

  810. 

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

  812.     if (v->res_x8)

  813.     {

  814.         av_log(avctx, AV_LOG_ERROR,

  815.                "1 for reserved RES_X8 is forbidden\n");

  816.         //return -1;

  817.     }

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

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

  820.     if (!v->res_fasttx)

  821.     {

  822.         v->s.dsp.vc1_inv_trans_8x8 = simple_idct;

  823.     }

  824. 

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

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

  827.     {

  828.         av_log(avctx, AV_LOG_ERROR,

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

  830.         return -1;

  831.     }

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

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

  834.     {

  835.         av_log(avctx, AV_LOG_ERROR,

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

  837.         return -1;

  838.     }

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

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

  841. 

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

  843.     if (v->res_transtab)

  844.     {

  845.         av_log(avctx, AV_LOG_ERROR,

  846.                "1 for reserved RES_TRANSTAB is forbidden\n");

  847.         return -1;

  848.     }

  849. 

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

  851. 

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

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

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

  855.     {

  856.         av_log(avctx, AV_LOG_INFO,

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

  858.     }

  859. 

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

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

  862. 

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

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

  865.     if (!v->res_rtm_flag)

  866.     {

  867. //            av_log(avctx, AV_LOG_ERROR,

  868. //                   "0 for reserved RES_RTM_FLAG is forbidden\n");

  869.         av_log(avctx, AV_LOG_ERROR,

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

  871.         //return -1;

  872.     }

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

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

  875.     av_log(avctx, AV_LOG_DEBUG,

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

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

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

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

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

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

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

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

  884.                );

  885.     return 0;

  886. }

  887. 

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

  889. {

  890.     v->res_rtm_flag = 1;

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

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

  893.     {

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

  895.     }

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

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

  898.     {

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

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

  901.         return -1;

  902.     }

  903. 

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

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

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

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

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

  909. 

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

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

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

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

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

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

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

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

  918.     skip_bits1(gb); // reserved

  919. 

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

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

  922. 

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

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

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

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

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

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

  929.                v->tfcntrflag, v->finterpflag

  930.                );

  931. 

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

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

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

  935.         return -1;

  936.     }

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

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

  939.         int w, h, ar = 0;

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

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

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

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

  944.         if(get_bits1(gb))

  945.             ar = get_bits(gb, 4);

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

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

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

  949.             w = get_bits(gb, 8);

  950.             h = get_bits(gb, 8);

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

  952.         }

  953. 

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

  955.             if(get_bits1(gb)) {

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

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

  958.             } else {

  959.                 int nr, dr;

  960.                 nr = get_bits(gb, 8);

  961.                 dr = get_bits(gb, 4);

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

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

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

  965.                 }

  966.             }

  967.         }

  968. 

  969.         if(get_bits1(gb)){

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

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

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

  973.         }

  974.     }

  975. 

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

  977.     if(v->hrd_param_flag) {

  978.         int i;

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

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

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

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

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

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

  985.         }

  986.     }

  987.     return 0;

  988. }

  989. 

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

  991. {

  992.     VC1Context *v = avctx->priv_data;

  993.     int i, blink, clentry, refdist;

  994. 

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

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

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

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

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

  1000.     v->s.loop_filter = get_bits1(gb);

  1001.     v->fastuvmc = get_bits1(gb);

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

  1003.     v->dquant = get_bits(gb, 2);

  1004.     v->vstransform = get_bits1(gb);

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

  1006.     v->quantizer_mode = get_bits(gb, 2);

  1007. 

  1008.     if(v->hrd_param_flag){

  1009.         for(i = 0; i < v->hrd_num_leaky_buckets; i++) {

  1010.             skip_bits(gb, 8); //hrd_full[n]

  1011.         }

  1012.     }

  1013. 

  1014.     if(get_bits1(gb)){

  1015.         avctx->coded_width = (get_bits(gb, 12)+1)<<1;

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

  1017.     }

  1018.     if(v->extended_mv)

  1019.         v->extended_dmv = get_bits1(gb);

  1020.     if(get_bits1(gb)) {

  1021.         av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");

  1022.         skip_bits(gb, 3); // Y range, ignored for now

  1023.     }

  1024.     if(get_bits1(gb)) {

  1025.         av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");

  1026.         skip_bits(gb, 3); // UV range, ignored for now

  1027.     }

  1028. 

  1029.     av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"

  1030.         "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"

  1031.         "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"

  1032.         "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",

  1033.         blink, clentry, v->panscanflag, refdist, v->s.loop_filter,

  1034.         v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

  1035. 

  1036.     return 0;

  1037. }

  1038. 

  1039. static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

  1040. {

  1041.     int pqindex, lowquant, status;

  1042. 

  1043.     if(v->finterpflag) v->interpfrm = get_bits1(gb);

  1044.     skip_bits(gb, 2); //framecnt unused

  1045.     v->rangeredfrm = 0;

  1046.     if (v->rangered) v->rangeredfrm = get_bits1(gb);

  1047.     v->s.pict_type = get_bits1(gb);

  1048.     if (v->s.avctx->max_b_frames) {

  1049.         if (!v->s.pict_type) {

  1050.             if (get_bits1(gb)) v->s.pict_type = I_TYPE;

  1051.             else v->s.pict_type = B_TYPE;

  1052.         } else v->s.pict_type = P_TYPE;

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

  1054. 

  1055.     v->bi_type = 0;

  1056.     if(v->s.pict_type == B_TYPE) {

  1057.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1058.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1059.         if(v->bfraction == 0) {

  1060.             v->s.pict_type = BI_TYPE;

  1061.         }

  1062.     }

  1063.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1064.         skip_bits(gb, 7); // skip buffer fullness

  1065. 

  1066.     /* calculate RND */

  1067.     if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1068.         v->rnd = 1;

  1069.     if(v->s.pict_type == P_TYPE)

  1070.         v->rnd ^= 1;

  1071. 

  1072.     /* Quantizer stuff */

  1073.     pqindex = get_bits(gb, 5);

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

  1075.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1076.     else

  1077.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1078. 

  1079.     v->pquantizer = 1;

  1080.     if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)

  1081.         v->pquantizer = pqindex < 9;

  1082.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1083.         v->pquantizer = 0;

  1084.     v->pqindex = pqindex;

  1085.     if (pqindex < 9) v->halfpq = get_bits1(gb);

  1086.     else v->halfpq = 0;

  1087.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1088.         v->pquantizer = get_bits1(gb);

  1089.     v->dquantfrm = 0;

  1090.     if (v->extended_mv == 1) v->mvrange = get_unary(gb, 0, 3);

  1091.     v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1092.     v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1093.     v->range_x = 1 << (v->k_x - 1);

  1094.     v->range_y = 1 << (v->k_y - 1);

  1095.     if (v->profile == PROFILE_ADVANCED)

  1096.     {

  1097.         if (v->postprocflag) v->postproc = get_bits1(gb);

  1098.     }

  1099.     else

  1100.         if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

  1101. 

  1102.     if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){

  1103.         v->x8_type = get_bits1(gb);

  1104.     }else v->x8_type = 0;

  1105. //av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",

  1106. //        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

  1107. 

  1108.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1109. 

  1110.     switch(v->s.pict_type) {

  1111.     case P_TYPE:

  1112.         if (v->pq < 5) v->tt_index = 0;

  1113.         else if(v->pq < 13) v->tt_index = 1;

  1114.         else v->tt_index = 2;

  1115. 

  1116.         lowquant = (v->pq > 12) ? 0 : 1;

  1117.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];

  1118.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1119.         {

  1120.             int scale, shift, i;

  1121.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];

  1122.             v->lumscale = get_bits(gb, 6);

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

  1124.             v->use_ic = 1;

  1125.             /* fill lookup tables for intensity compensation */

  1126.             if(!v->lumscale) {

  1127.                 scale = -64;

  1128.                 shift = (255 - v->lumshift * 2) << 6;

  1129.                 if(v->lumshift > 31)

  1130.                     shift += 128 << 6;

  1131.             } else {

  1132.                 scale = v->lumscale + 32;

  1133.                 if(v->lumshift > 31)

  1134.                     shift = (v->lumshift - 64) << 6;

  1135.                 else

  1136.                     shift = v->lumshift << 6;

  1137.             }

  1138.             for(i = 0; i < 256; i++) {

  1139.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1140.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1141.             }

  1142.         }

  1143.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1144.             v->s.quarter_sample = 0;

  1145.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1146.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1147.                 v->s.quarter_sample = 0;

  1148.             else

  1149.                 v->s.quarter_sample = 1;

  1150.         } else

  1151.             v->s.quarter_sample = 1;

  1152.         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));

  1153. 

  1154.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1155.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1156.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1157.         {

  1158.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1159.             if (status < 0) return -1;

  1160.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1161.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1162.         } else {

  1163.             v->mv_type_is_raw = 0;

  1164.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1165.         }

  1166.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1167.         if (status < 0) return -1;

  1168.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1169.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1170. 

  1171.         /* Hopefully this is correct for P frames */

  1172.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1173.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1174. 

  1175.         if (v->dquant)

  1176.         {

  1177.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1178.             vop_dquant_decoding(v);

  1179.         }

  1180. 

  1181.         v->ttfrm = 0; //FIXME Is that so ?

  1182.         if (v->vstransform)

  1183.         {

  1184.             v->ttmbf = get_bits1(gb);

  1185.             if (v->ttmbf)

  1186.             {

  1187.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1188.             }

  1189.         } else {

  1190.             v->ttmbf = 1;

  1191.             v->ttfrm = TT_8X8;

  1192.         }

  1193.         break;

  1194.     case B_TYPE:

  1195.         if (v->pq < 5) v->tt_index = 0;

  1196.         else if(v->pq < 13) v->tt_index = 1;

  1197.         else v->tt_index = 2;

  1198. 

  1199.         lowquant = (v->pq > 12) ? 0 : 1;

  1200.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1201.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1202.         v->s.mspel = v->s.quarter_sample;

  1203. 

  1204.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1205.         if (status < 0) return -1;

  1206.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1207.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1208.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1209.         if (status < 0) return -1;

  1210.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1211.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1212. 

  1213.         v->s.mv_table_index = get_bits(gb, 2);

  1214.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1215. 

  1216.         if (v->dquant)

  1217.         {

  1218.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1219.             vop_dquant_decoding(v);

  1220.         }

  1221. 

  1222.         v->ttfrm = 0;

  1223.         if (v->vstransform)

  1224.         {

  1225.             v->ttmbf = get_bits1(gb);

  1226.             if (v->ttmbf)

  1227.             {

  1228.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1229.             }

  1230.         } else {

  1231.             v->ttmbf = 1;

  1232.             v->ttfrm = TT_8X8;

  1233.         }

  1234.         break;

  1235.     }

  1236. 

  1237.   if(!v->x8_type)

  1238.   {

  1239.     /* AC Syntax */

  1240.     v->c_ac_table_index = decode012(gb);

  1241.     if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)

  1242.     {

  1243.         v->y_ac_table_index = decode012(gb);

  1244.     }

  1245.     /* DC Syntax */

  1246.     v->s.dc_table_index = get_bits1(gb);

  1247.   }

  1248. 

  1249.     if(v->s.pict_type == BI_TYPE) {

  1250.         v->s.pict_type = B_TYPE;

  1251.         v->bi_type = 1;

  1252.     }

  1253.     return 0;

  1254. }

  1255. 

  1256. static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)

  1257. {

  1258.     int pqindex, lowquant;

  1259.     int status;

  1260. 

  1261.     v->p_frame_skipped = 0;

  1262. 

  1263.     if(v->interlace){

  1264.         v->fcm = decode012(gb);

  1265.         if(v->fcm) return -1; // interlaced frames/fields are not implemented

  1266.     }

  1267.     switch(get_unary(gb, 0, 4)) {

  1268.     case 0:

  1269.         v->s.pict_type = P_TYPE;

  1270.         break;

  1271.     case 1:

  1272.         v->s.pict_type = B_TYPE;

  1273.         break;

  1274.     case 2:

  1275.         v->s.pict_type = I_TYPE;

  1276.         break;

  1277.     case 3:

  1278.         v->s.pict_type = BI_TYPE;

  1279.         break;

  1280.     case 4:

  1281.         v->s.pict_type = P_TYPE; // skipped pic

  1282.         v->p_frame_skipped = 1;

  1283.         return 0;

  1284.     }

  1285.     if(v->tfcntrflag)

  1286.         skip_bits(gb, 8);

  1287.     if(v->broadcast) {

  1288.         if(!v->interlace || v->psf) {

  1289.             v->rptfrm = get_bits(gb, 2);

  1290.         } else {

  1291.             v->tff = get_bits1(gb);

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

  1293.         }

  1294.     }

  1295.     if(v->panscanflag) {

  1296.         //...

  1297.     }

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

  1299.     if(v->interlace)

  1300.         v->uvsamp = get_bits1(gb);

  1301.     if(v->finterpflag) v->interpfrm = get_bits1(gb);

  1302.     if(v->s.pict_type == B_TYPE) {

  1303.         v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);

  1304.         v->bfraction = ff_vc1_bfraction_lut[v->bfraction];

  1305.         if(v->bfraction == 0) {

  1306.             v->s.pict_type = BI_TYPE; /* XXX: should not happen here */

  1307.         }

  1308.     }

  1309.     pqindex = get_bits(gb, 5);

  1310.     v->pqindex = pqindex;

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

  1312.         v->pq = ff_vc1_pquant_table[0][pqindex];

  1313.     else

  1314.         v->pq = ff_vc1_pquant_table[1][pqindex];

  1315. 

  1316.     v->pquantizer = 1;

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

  1318.         v->pquantizer = pqindex < 9;

  1319.     if (v->quantizer_mode == QUANT_NON_UNIFORM)

  1320.         v->pquantizer = 0;

  1321.     v->pqindex = pqindex;

  1322.     if (pqindex < 9) v->halfpq = get_bits1(gb);

  1323.     else v->halfpq = 0;

  1324.     if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)

  1325.         v->pquantizer = get_bits1(gb);

  1326. 

  1327.     if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

  1328. 

  1329.     switch(v->s.pict_type) {

  1330.     case I_TYPE:

  1331.     case BI_TYPE:

  1332.         status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);

  1333.         if (status < 0) return -1;

  1334.         av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "

  1335.                 "Imode: %i, Invert: %i\n", status>>1, status&1);

  1336.         v->condover = CONDOVER_NONE;

  1337.         if(v->overlap && v->pq <= 8) {

  1338.             v->condover = decode012(gb);

  1339.             if(v->condover == CONDOVER_SELECT) {

  1340.                 status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);

  1341.                 if (status < 0) return -1;

  1342.                 av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "

  1343.                         "Imode: %i, Invert: %i\n", status>>1, status&1);

  1344.             }

  1345.         }

  1346.         break;

  1347.     case P_TYPE:

  1348.         if(v->postprocflag)

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

  1350.         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);

  1351.         else v->mvrange = 0;

  1352.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1353.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1354.         v->range_x = 1 << (v->k_x - 1);

  1355.         v->range_y = 1 << (v->k_y - 1);

  1356. 

  1357.         if (v->pq < 5) v->tt_index = 0;

  1358.         else if(v->pq < 13) v->tt_index = 1;

  1359.         else v->tt_index = 2;

  1360. 

  1361.         lowquant = (v->pq > 12) ? 0 : 1;

  1362.         v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];

  1363.         if (v->mv_mode == MV_PMODE_INTENSITY_COMP)

  1364.         {

  1365.             int scale, shift, i;

  1366.             v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];

  1367.             v->lumscale = get_bits(gb, 6);

  1368.             v->lumshift = get_bits(gb, 6);

  1369.             /* fill lookup tables for intensity compensation */

  1370.             if(!v->lumscale) {

  1371.                 scale = -64;

  1372.                 shift = (255 - v->lumshift * 2) << 6;

  1373.                 if(v->lumshift > 31)

  1374.                     shift += 128 << 6;

  1375.             } else {

  1376.                 scale = v->lumscale + 32;

  1377.                 if(v->lumshift > 31)

  1378.                     shift = (v->lumshift - 64) << 6;

  1379.                 else

  1380.                     shift = v->lumshift << 6;

  1381.             }

  1382.             for(i = 0; i < 256; i++) {

  1383.                 v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);

  1384.                 v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);

  1385.             }

  1386.             v->use_ic = 1;

  1387.         }

  1388.         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)

  1389.             v->s.quarter_sample = 0;

  1390.         else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {

  1391.             if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)

  1392.                 v->s.quarter_sample = 0;

  1393.             else

  1394.                 v->s.quarter_sample = 1;

  1395.         } else

  1396.             v->s.quarter_sample = 1;

  1397.         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));

  1398. 

  1399.         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&

  1400.                  v->mv_mode2 == MV_PMODE_MIXED_MV)

  1401.                 || v->mv_mode == MV_PMODE_MIXED_MV)

  1402.         {

  1403.             status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);

  1404.             if (status < 0) return -1;

  1405.             av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "

  1406.                    "Imode: %i, Invert: %i\n", status>>1, status&1);

  1407.         } else {

  1408.             v->mv_type_is_raw = 0;

  1409.             memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);

  1410.         }

  1411.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1412.         if (status < 0) return -1;

  1413.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1414.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1415. 

  1416.         /* Hopefully this is correct for P frames */

  1417.         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables

  1418.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1419.         if (v->dquant)

  1420.         {

  1421.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1422.             vop_dquant_decoding(v);

  1423.         }

  1424. 

  1425.         v->ttfrm = 0; //FIXME Is that so ?

  1426.         if (v->vstransform)

  1427.         {

  1428.             v->ttmbf = get_bits1(gb);

  1429.             if (v->ttmbf)

  1430.             {

  1431.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1432.             }

  1433.         } else {

  1434.             v->ttmbf = 1;

  1435.             v->ttfrm = TT_8X8;

  1436.         }

  1437.         break;

  1438.     case B_TYPE:

  1439.         if(v->postprocflag)

  1440.             v->postproc = get_bits1(gb);

  1441.         if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);

  1442.         else v->mvrange = 0;

  1443.         v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13

  1444.         v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11

  1445.         v->range_x = 1 << (v->k_x - 1);

  1446.         v->range_y = 1 << (v->k_y - 1);

  1447. 

  1448.         if (v->pq < 5) v->tt_index = 0;

  1449.         else if(v->pq < 13) v->tt_index = 1;

  1450.         else v->tt_index = 2;

  1451. 

  1452.         lowquant = (v->pq > 12) ? 0 : 1;

  1453.         v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;

  1454.         v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);

  1455.         v->s.mspel = v->s.quarter_sample;

  1456. 

  1457.         status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);

  1458.         if (status < 0) return -1;

  1459.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "

  1460.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1461.         status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);

  1462.         if (status < 0) return -1;

  1463.         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "

  1464.                "Imode: %i, Invert: %i\n", status>>1, status&1);

  1465. 

  1466.         v->s.mv_table_index = get_bits(gb, 2);

  1467.         v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];

  1468. 

  1469.         if (v->dquant)

  1470.         {

  1471.             av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1472.             vop_dquant_decoding(v);

  1473.         }

  1474. 

  1475.         v->ttfrm = 0;

  1476.         if (v->vstransform)

  1477.         {

  1478.             v->ttmbf = get_bits1(gb);

  1479.             if (v->ttmbf)

  1480.             {

  1481.                 v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];

  1482.             }

  1483.         } else {

  1484.             v->ttmbf = 1;

  1485.             v->ttfrm = TT_8X8;

  1486.         }

  1487.         break;

  1488.     }

  1489. 

  1490.     /* AC Syntax */

  1491.     v->c_ac_table_index = decode012(gb);

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

  1493.     {

  1494.         v->y_ac_table_index = decode012(gb);

  1495.     }

  1496.     /* DC Syntax */

  1497.     v->s.dc_table_index = get_bits1(gb);

  1498.     if ((v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE) && v->dquant) {

  1499.         av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");

  1500.         vop_dquant_decoding(v);

  1501.     }

  1502. 

  1503.     v->bi_type = 0;

  1504.     if(v->s.pict_type == BI_TYPE) {

  1505.         v->s.pict_type = B_TYPE;

  1506.         v->bi_type = 1;

  1507.     }

  1508.     return 0;

  1509. }

  1510. 

  1511. /***********************************************************************/

  1512. /**

  1513.  * @defgroup block VC-1 Block-level functions

  1514.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  1515.  * @{

  1516.  */

  1517. 

  1518. /**

  1519.  * @def GET_MQUANT

  1520.  * @brief Get macroblock-level quantizer scale

  1521.  */

  1522. #define GET_MQUANT()                                           \

  1523.   if (v->dquantfrm)                                            \

  1524.   {                                                            \

  1525.     int edges = 0;                                             \

  1526.     if (v->dqprofile == DQPROFILE_ALL_MBS)                     \

  1527.     {                                                          \

  1528.       if (v->dqbilevel)                                        \

  1529.       {                                                        \

  1530.         mquant = (get_bits1(gb)) ? v->altpq : v->pq;           \

  1531.       }                                                        \

  1532.       else                                                     \

  1533.       {                                                        \

  1534.         mqdiff = get_bits(gb, 3);                              \

  1535.         if (mqdiff != 7) mquant = v->pq + mqdiff;              \

  1536.         else mquant = get_bits(gb, 5);                         \

  1537.       }                                                        \

  1538.     }                                                          \

  1539.     if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \

  1540.         edges = 1 << v->dqsbedge;                              \

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

  1542.         edges = (3 << v->dqsbedge) % 15;                       \

  1543.     else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \

  1544.         edges = 15;                                            \

  1545.     if((edges&1) && !s->mb_x)                                  \

  1546.         mquant = v->altpq;                                     \

  1547.     if((edges&2) && s->first_slice_line)                       \

  1548.         mquant = v->altpq;                                     \

  1549.     if((edges&4) && s->mb_x == (s->mb_width - 1))              \

  1550.         mquant = v->altpq;                                     \

  1551.     if((edges&8) && s->mb_y == (s->mb_height - 1))             \

  1552.         mquant = v->altpq;                                     \

  1553.   }

  1554. 

  1555. /**

  1556.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  1557.  * @brief Get MV differentials

  1558.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  1559.  * @param _dmv_x Horizontal differential for decoded MV

  1560.  * @param _dmv_y Vertical differential for decoded MV

  1561.  */

  1562. #define GET_MVDATA(_dmv_x, _dmv_y)                                  \

  1563.   index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table,\

  1564.                        VC1_MV_DIFF_VLC_BITS, 2);                    \

  1565.   if (index > 36)                                                   \

  1566.   {                                                                 \

  1567.     mb_has_coeffs = 1;                                              \

  1568.     index -= 37;                                                    \

  1569.   }                                                                 \

  1570.   else mb_has_coeffs = 0;                                           \

  1571.   s->mb_intra = 0;                                                  \

  1572.   if (!index) { _dmv_x = _dmv_y = 0; }                              \

  1573.   else if (index == 35)                                             \

  1574.   {                                                                 \

  1575.     _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  1576.     _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  1577.   }                                                                 \

  1578.   else if (index == 36)                                             \

  1579.   {                                                                 \

  1580.     _dmv_x = 0;                                                     \

  1581.     _dmv_y = 0;                                                     \

  1582.     s->mb_intra = 1;                                                \

  1583.   }                                                                 \

  1584.   else                                                              \

  1585.   {                                                                 \

  1586.     index1 = index%6;                                               \

  1587.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1588.     else                                   val = 0;                 \

  1589.     if(size_table[index1] - val > 0)                                \

  1590.         val = get_bits(gb, size_table[index1] - val);               \

  1591.     else                                   val = 0;                 \

  1592.     sign = 0 - (val&1);                                             \

  1593.     _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1594.                                                                     \

  1595.     index1 = index/6;                                               \

  1596.     if (!s->quarter_sample && index1 == 5) val = 1;                 \

  1597.     else                                   val = 0;                 \

  1598.     if(size_table[index1] - val > 0)                                \

  1599.         val = get_bits(gb, size_table[index1] - val);               \

  1600.     else                                   val = 0;                 \

  1601.     sign = 0 - (val&1);                                             \

  1602.     _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \

  1603.   }

  1604. 

  1605. /** Predict and set motion vector

  1606.  */

  1607. 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)

  1608. {

  1609.     int xy, wrap, off = 0;

  1610.     int16_t *A, *B, *C;

  1611.     int px, py;

  1612.     int sum;

  1613. 

  1614.     /* scale MV difference to be quad-pel */

  1615.     dmv_x <<= 1 - s->quarter_sample;

  1616.     dmv_y <<= 1 - s->quarter_sample;

  1617. 

  1618.     wrap = s->b8_stride;

  1619.     xy = s->block_index[n];

  1620. 

  1621.     if(s->mb_intra){

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

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

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

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

  1626.         if(mv1) { /* duplicate motion data for 1-MV block */

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

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

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

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

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

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

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

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

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

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

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

  1638.             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

  1639.         }

  1640.         return;

  1641.     }

  1642. 

  1643.     C = s->current_picture.motion_val[0][xy - 1];

  1644.     A = s->current_picture.motion_val[0][xy - wrap];

  1645.     if(mv1)

  1646.         off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;

  1647.     else {

  1648.         //in 4-MV mode different blocks have different B predictor position

  1649.         switch(n){

  1650.         case 0:

  1651.             off = (s->mb_x > 0) ? -1 : 1;

  1652.             break;

  1653.         case 1:

  1654.             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;

  1655.             break;

  1656.         case 2:

  1657.             off = 1;

  1658.             break;

  1659.         case 3:

  1660.             off = -1;

  1661.         }

  1662.     }

  1663.     B = s->current_picture.motion_val[0][xy - wrap + off];

  1664. 

  1665.     if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds

  1666.         if(s->mb_width == 1) {

  1667.             px = A[0];

  1668.             py = A[1];

  1669.         } else {

  1670.             px = mid_pred(A[0], B[0], C[0]);

  1671.             py = mid_pred(A[1], B[1], C[1]);

  1672.         }

  1673.     } else if(s->mb_x || (n==1 || n==3)) { // predictor C is not out of bounds

  1674.         px = C[0];

  1675.         py = C[1];

  1676.     } else {

  1677.         px = py = 0;

  1678.     }

  1679.     /* Pullback MV as specified in 8.3.5.3.4 */

  1680.     {

  1681.         int qx, qy, X, Y;

  1682.         qx = (s->mb_x << 6) + ((n==1 || n==3) ? 32 : 0);

  1683.         qy = (s->mb_y << 6) + ((n==2 || n==3) ? 32 : 0);

  1684.         X = (s->mb_width << 6) - 4;

  1685.         Y = (s->mb_height << 6) - 4;

  1686.         if(mv1) {

  1687.             if(qx + px < -60) px = -60 - qx;

  1688.             if(qy + py < -60) py = -60 - qy;

  1689.         } else {

  1690.             if(qx + px < -28) px = -28 - qx;

  1691.             if(qy + py < -28) py = -28 - qy;

  1692.         }

  1693.         if(qx + px > X) px = X - qx;

  1694.         if(qy + py > Y) py = Y - qy;

  1695.     }

  1696.     /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1697.     if((!s->first_slice_line || (n==2 || n==3)) && (s->mb_x || (n==1 || n==3))) {

  1698.         if(is_intra[xy - wrap])

  1699.             sum = FFABS(px) + FFABS(py);

  1700.         else

  1701.             sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1702.         if(sum > 32) {

  1703.             if(get_bits1(&s->gb)) {

  1704.                 px = A[0];

  1705.                 py = A[1];

  1706.             } else {

  1707.                 px = C[0];

  1708.                 py = C[1];

  1709.             }

  1710.         } else {

  1711.             if(is_intra[xy - 1])

  1712.                 sum = FFABS(px) + FFABS(py);

  1713.             else

  1714.                 sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1715.             if(sum > 32) {

  1716.                 if(get_bits1(&s->gb)) {

  1717.                     px = A[0];

  1718.                     py = A[1];

  1719.                 } else {

  1720.                     px = C[0];

  1721.                     py = C[1];

  1722.                 }

  1723.             }

  1724.         }

  1725.     }

  1726.     /* store MV using signed modulus of MV range defined in 4.11 */

  1727.     s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;

  1728.     s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

  1729.     if(mv1) { /* duplicate motion data for 1-MV block */

  1730.         s->current_picture.motion_val[0][xy + 1][0] = s->current_picture.motion_val[0][xy][0];

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

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

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

  1734.         s->current_picture.motion_val[0][xy + wrap + 1][0] = s->current_picture.motion_val[0][xy][0];

  1735.         s->current_picture.motion_val[0][xy + wrap + 1][1] = s->current_picture.motion_val[0][xy][1];

  1736.     }

  1737. }

  1738. 

  1739. /** Motion compensation for direct or interpolated blocks in B-frames

  1740.  */

  1741. static void vc1_interp_mc(VC1Context *v)

  1742. {

  1743.     MpegEncContext *s = &v->s;

  1744.     DSPContext *dsp = &v->s.dsp;

  1745.     uint8_t *srcY, *srcU, *srcV;

  1746.     int dxy, uvdxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  1747. 

  1748.     if(!v->s.next_picture.data[0])return;

  1749. 

  1750.     mx = s->mv[1][0][0];

  1751.     my = s->mv[1][0][1];

  1752.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  1753.     uvmy = (my + ((my & 3) == 3)) >> 1;

  1754.     if(v->fastuvmc) {

  1755.         uvmx = uvmx + ((uvmx<0)?-(uvmx&1):(uvmx&1));

  1756.         uvmy = uvmy + ((uvmy<0)?-(uvmy&1):(uvmy&1));

  1757.     }

  1758.     srcY = s->next_picture.data[0];

  1759.     srcU = s->next_picture.data[1];

  1760.     srcV = s->next_picture.data[2];

  1761. 

  1762.     src_x = s->mb_x * 16 + (mx >> 2);

  1763.     src_y = s->mb_y * 16 + (my >> 2);

  1764.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  1765.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  1766. 

  1767.     if(v->profile != PROFILE_ADVANCED){

  1768.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  1769.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  1770.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  1771.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  1772.     }else{

  1773.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  1774.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  1775.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  1776.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  1777.     }

  1778. 

  1779.     srcY += src_y * s->linesize + src_x;

  1780.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  1781.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  1782. 

  1783.     /* for grayscale we should not try to read from unknown area */

  1784.     if(s->flags & CODEC_FLAG_GRAY) {

  1785.         srcU = s->edge_emu_buffer + 18 * s->linesize;

  1786.         srcV = s->edge_emu_buffer + 18 * s->linesize;

  1787.     }

  1788. 

  1789.     if(v->rangeredfrm

  1790.        || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16

  1791.        || (unsigned)src_y > s->v_edge_pos - (my&3) - 16){

  1792.         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

  1793. 

  1794.         srcY -= s->mspel * (1 + s->linesize);

  1795.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, 17+s->mspel*2, 17+s->mspel*2,

  1796.                             src_x - s->mspel, src_y - s->mspel, s->h_edge_pos, s->v_edge_pos);

  1797.         srcY = s->edge_emu_buffer;

  1798.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,

  1799.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1800.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, 8+1, 8+1,

  1801.                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  1802.         srcU = uvbuf;

  1803.         srcV = uvbuf + 16;

  1804.         /* if we deal with range reduction we need to scale source blocks */

  1805.         if(v->rangeredfrm) {

  1806.             int i, j;

  1807.             uint8_t *src, *src2;

  1808. 

  1809.             src = srcY;

  1810.             for(j = 0; j < 17 + s->mspel*2; j++) {

  1811.                 for(i = 0; i < 17 + s->mspel*2; i++) src[i] = ((src[i] - 128) >> 1) + 128;

  1812.                 src += s->linesize;

  1813.             }

  1814.             src = srcU; src2 = srcV;

  1815.             for(j = 0; j < 9; j++) {

  1816.                 for(i = 0; i < 9; i++) {

  1817.                     src[i] = ((src[i] - 128) >> 1) + 128;

  1818.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  1819.                 }

  1820.                 src += s->uvlinesize;

  1821.                 src2 += s->uvlinesize;

  1822.             }

  1823.         }

  1824.         srcY += s->mspel * (1 + s->linesize);

  1825.     }

  1826. 

  1827.     mx >>= 1;

  1828.     my >>= 1;

  1829.     dxy = ((my & 1) << 1) | (mx & 1);

  1830. 

  1831.     dsp->avg_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  1832. 

  1833.     if(s->flags & CODEC_FLAG_GRAY) return;

  1834.     /* Chroma MC always uses qpel blilinear */

  1835.     uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);

  1836.     uvmx = (uvmx&3)<<1;

  1837.     uvmy = (uvmy&3)<<1;

  1838.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  1839.     dsp->avg_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  1840. }

  1841. 

  1842. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)

  1843. {

  1844.     int n = bfrac;

  1845. 

  1846. #if B_FRACTION_DEN==256

  1847.     if(inv)

  1848.         n -= 256;

  1849.     if(!qs)

  1850.         return 2 * ((value * n + 255) >> 9);

  1851.     return (value * n + 128) >> 8;

  1852. #else

  1853.     if(inv)

  1854.         n -= B_FRACTION_DEN;

  1855.     if(!qs)

  1856.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));

  1857.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;

  1858. #endif

  1859. }

  1860. 

  1861. /** Reconstruct motion vector for B-frame and do motion compensation

  1862.  */

  1863. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

  1864. {

  1865.     if(v->use_ic) {

  1866.         v->mv_mode2 = v->mv_mode;

  1867.         v->mv_mode = MV_PMODE_INTENSITY_COMP;

  1868.     }

  1869.     if(direct) {

  1870.         vc1_mc_1mv(v, 0);

  1871.         vc1_interp_mc(v);

  1872.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1873.         return;

  1874.     }

  1875.     if(mode == BMV_TYPE_INTERPOLATED) {

  1876.         vc1_mc_1mv(v, 0);

  1877.         vc1_interp_mc(v);

  1878.         if(v->use_ic) v->mv_mode = v->mv_mode2;

  1879.         return;

  1880.     }

  1881. 

  1882.     if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;

  1883.     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  1884.     if(v->use_ic) v->mv_mode = v->mv_mode2;

  1885. }

  1886. 

  1887. static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

  1888. {

  1889.     MpegEncContext *s = &v->s;

  1890.     int xy, wrap, off = 0;

  1891.     int16_t *A, *B, *C;

  1892.     int px, py;

  1893.     int sum;

  1894.     int r_x, r_y;

  1895.     const uint8_t *is_intra = v->mb_type[0];

  1896. 

  1897.     r_x = v->range_x;

  1898.     r_y = v->range_y;

  1899.     /* scale MV difference to be quad-pel */

  1900.     dmv_x[0] <<= 1 - s->quarter_sample;

  1901.     dmv_y[0] <<= 1 - s->quarter_sample;

  1902.     dmv_x[1] <<= 1 - s->quarter_sample;

  1903.     dmv_y[1] <<= 1 - s->quarter_sample;

  1904. 

  1905.     wrap = s->b8_stride;

  1906.     xy = s->block_index[0];

  1907. 

  1908.     if(s->mb_intra) {

  1909.         s->current_picture.motion_val[0][xy][0] =

  1910.         s->current_picture.motion_val[0][xy][1] =

  1911.         s->current_picture.motion_val[1][xy][0] =

  1912.         s->current_picture.motion_val[1][xy][1] = 0;

  1913.         return;

  1914.     }

  1915.     s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);

  1916.     s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);

  1917.     s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);

  1918.     s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

  1919. 

  1920.     /* Pullback predicted motion vectors as specified in 8.4.5.4 */

  1921.     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));

  1922.     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));

  1923.     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));

  1924.     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));

  1925.     if(direct) {

  1926.         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  1927.         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  1928.         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  1929.         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  1930.         return;

  1931.     }

  1932. 

  1933.     if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  1934.         C = s->current_picture.motion_val[0][xy - 2];

  1935.         A = s->current_picture.motion_val[0][xy - wrap*2];

  1936.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  1937.         B = s->current_picture.motion_val[0][xy - wrap*2 + off];

  1938. 

  1939.         if(!s->mb_x) C[0] = C[1] = 0;

  1940.         if(!s->first_slice_line) { // predictor A is not out of bounds

  1941.             if(s->mb_width == 1) {

  1942.                 px = A[0];

  1943.                 py = A[1];

  1944.             } else {

  1945.                 px = mid_pred(A[0], B[0], C[0]);

  1946.                 py = mid_pred(A[1], B[1], C[1]);

  1947.             }

  1948.         } else if(s->mb_x) { // predictor C is not out of bounds

  1949.             px = C[0];

  1950.             py = C[1];

  1951.         } else {

  1952.             px = py = 0;

  1953.         }

  1954.         /* Pullback MV as specified in 8.3.5.3.4 */

  1955.         {

  1956.             int qx, qy, X, Y;

  1957.             if(v->profile < PROFILE_ADVANCED) {

  1958.                 qx = (s->mb_x << 5);

  1959.                 qy = (s->mb_y << 5);

  1960.                 X = (s->mb_width << 5) - 4;

  1961.                 Y = (s->mb_height << 5) - 4;

  1962.                 if(qx + px < -28) px = -28 - qx;

  1963.                 if(qy + py < -28) py = -28 - qy;

  1964.                 if(qx + px > X) px = X - qx;

  1965.                 if(qy + py > Y) py = Y - qy;

  1966.             } else {

  1967.                 qx = (s->mb_x << 6);

  1968.                 qy = (s->mb_y << 6);

  1969.                 X = (s->mb_width << 6) - 4;

  1970.                 Y = (s->mb_height << 6) - 4;

  1971.                 if(qx + px < -60) px = -60 - qx;

  1972.                 if(qy + py < -60) py = -60 - qy;

  1973.                 if(qx + px > X) px = X - qx;

  1974.                 if(qy + py > Y) py = Y - qy;

  1975.             }

  1976.         }

  1977.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  1978.         if(0 && !s->first_slice_line && s->mb_x) {

  1979.             if(is_intra[xy - wrap])

  1980.                 sum = FFABS(px) + FFABS(py);

  1981.             else

  1982.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  1983.             if(sum > 32) {

  1984.                 if(get_bits1(&s->gb)) {

  1985.                     px = A[0];

  1986.                     py = A[1];

  1987.                 } else {

  1988.                     px = C[0];

  1989.                     py = C[1];

  1990.                 }

  1991.             } else {

  1992.                 if(is_intra[xy - 2])

  1993.                     sum = FFABS(px) + FFABS(py);

  1994.                 else

  1995.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  1996.                 if(sum > 32) {

  1997.                     if(get_bits1(&s->gb)) {

  1998.                         px = A[0];

  1999.                         py = A[1];

  2000.                     } else {

  2001.                         px = C[0];

  2002.                         py = C[1];

  2003.                     }

  2004.                 }

  2005.             }

  2006.         }

  2007.         /* store MV using signed modulus of MV range defined in 4.11 */

  2008.         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;

  2009.         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;

  2010.     }

  2011.     if((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

  2012.         C = s->current_picture.motion_val[1][xy - 2];

  2013.         A = s->current_picture.motion_val[1][xy - wrap*2];

  2014.         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

  2015.         B = s->current_picture.motion_val[1][xy - wrap*2 + off];

  2016. 

  2017.         if(!s->mb_x) C[0] = C[1] = 0;

  2018.         if(!s->first_slice_line) { // predictor A is not out of bounds

  2019.             if(s->mb_width == 1) {

  2020.                 px = A[0];

  2021.                 py = A[1];

  2022.             } else {

  2023.                 px = mid_pred(A[0], B[0], C[0]);

  2024.                 py = mid_pred(A[1], B[1], C[1]);

  2025.             }

  2026.         } else if(s->mb_x) { // predictor C is not out of bounds

  2027.             px = C[0];

  2028.             py = C[1];

  2029.         } else {

  2030.             px = py = 0;

  2031.         }

  2032.         /* Pullback MV as specified in 8.3.5.3.4 */

  2033.         {

  2034.             int qx, qy, X, Y;

  2035.             if(v->profile < PROFILE_ADVANCED) {

  2036.                 qx = (s->mb_x << 5);

  2037.                 qy = (s->mb_y << 5);

  2038.                 X = (s->mb_width << 5) - 4;

  2039.                 Y = (s->mb_height << 5) - 4;

  2040.                 if(qx + px < -28) px = -28 - qx;

  2041.                 if(qy + py < -28) py = -28 - qy;

  2042.                 if(qx + px > X) px = X - qx;

  2043.                 if(qy + py > Y) py = Y - qy;

  2044.             } else {

  2045.                 qx = (s->mb_x << 6);

  2046.                 qy = (s->mb_y << 6);

  2047.                 X = (s->mb_width << 6) - 4;

  2048.                 Y = (s->mb_height << 6) - 4;

  2049.                 if(qx + px < -60) px = -60 - qx;

  2050.                 if(qy + py < -60) py = -60 - qy;

  2051.                 if(qx + px > X) px = X - qx;

  2052.                 if(qy + py > Y) py = Y - qy;

  2053.             }

  2054.         }

  2055.         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

  2056.         if(0 && !s->first_slice_line && s->mb_x) {

  2057.             if(is_intra[xy - wrap])

  2058.                 sum = FFABS(px) + FFABS(py);

  2059.             else

  2060.                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

  2061.             if(sum > 32) {

  2062.                 if(get_bits1(&s->gb)) {

  2063.                     px = A[0];

  2064.                     py = A[1];

  2065.                 } else {

  2066.                     px = C[0];

  2067.                     py = C[1];

  2068.                 }

  2069.             } else {

  2070.                 if(is_intra[xy - 2])

  2071.                     sum = FFABS(px) + FFABS(py);

  2072.                 else

  2073.                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

  2074.                 if(sum > 32) {

  2075.                     if(get_bits1(&s->gb)) {

  2076.                         px = A[0];

  2077.                         py = A[1];

  2078.                     } else {

  2079.                         px = C[0];

  2080.                         py = C[1];

  2081.                     }

  2082.                 }

  2083.             }

  2084.         }

  2085.         /* store MV using signed modulus of MV range defined in 4.11 */

  2086. 

  2087.         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;

  2088.         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;

  2089.     }

  2090.     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];

  2091.     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];

  2092.     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];

  2093.     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

  2094. }

  2095. 

  2096. /** Get predicted DC value for I-frames only

  2097.  * prediction dir: left=0, top=1

  2098.  * @param s MpegEncContext

  2099.  * @param[in] n block index in the current MB

  2100.  * @param dc_val_ptr Pointer to DC predictor

  2101.  * @param dir_ptr Prediction direction for use in AC prediction

  2102.  */

  2103. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2104.                               int16_t **dc_val_ptr, int *dir_ptr)

  2105. {

  2106.     int a, b, c, wrap, pred, scale;

  2107.     int16_t *dc_val;

  2108.     static const uint16_t dcpred[32] = {

  2109.     -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  2110.          114,  102,   93,   85,   79,   73,   68,   64,

  2111.           60,   57,   54,   51,   49,   47,   45,   43,

  2112.           41,   39,   38,   37,   35,   34,   33

  2113.     };

  2114. 

  2115.     /* find prediction - wmv3_dc_scale always used here in fact */

  2116.     if (n < 4)     scale = s->y_dc_scale;

  2117.     else           scale = s->c_dc_scale;

  2118. 

  2119.     wrap = s->block_wrap[n];

  2120.     dc_val= s->dc_val[0] + s->block_index[n];

  2121. 

  2122.     /* B A

  2123.      * C X

  2124.      */

  2125.     c = dc_val[ - 1];

  2126.     b = dc_val[ - 1 - wrap];

  2127.     a = dc_val[ - wrap];

  2128. 

  2129.     if (pq < 9 || !overlap)

  2130.     {

  2131.         /* Set outer values */

  2132.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=dcpred[scale];

  2133.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=dcpred[scale];

  2134.     }

  2135.     else

  2136.     {

  2137.         /* Set outer values */

  2138.         if (s->first_slice_line && (n!=2 && n!=3)) b=a=0;

  2139.         if (s->mb_x == 0 && (n!=1 && n!=3)) b=c=0;

  2140.     }

  2141. 

  2142.     if (abs(a - b) <= abs(b - c)) {

  2143.         pred = c;

  2144.         *dir_ptr = 1;//left

  2145.     } else {

  2146.         pred = a;

  2147.         *dir_ptr = 0;//top

  2148.     }

  2149. 

  2150.     /* update predictor */

  2151.     *dc_val_ptr = &dc_val[0];

  2152.     return pred;

  2153. }

  2154. 

  2155. 

  2156. /** Get predicted DC value

  2157.  * prediction dir: left=0, top=1

  2158.  * @param s MpegEncContext

  2159.  * @param[in] n block index in the current MB

  2160.  * @param dc_val_ptr Pointer to DC predictor

  2161.  * @param dir_ptr Prediction direction for use in AC prediction

  2162.  */

  2163. static inline int vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  2164.                               int a_avail, int c_avail,

  2165.                               int16_t **dc_val_ptr, int *dir_ptr)

  2166. {

  2167.     int a, b, c, wrap, pred, scale;

  2168.     int16_t *dc_val;

  2169.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2170.     int q1, q2 = 0;

  2171. 

  2172.     /* find prediction - wmv3_dc_scale always used here in fact */

  2173.     if (n < 4)     scale = s->y_dc_scale;

  2174.     else           scale = s->c_dc_scale;

  2175. 

  2176.     wrap = s->block_wrap[n];

  2177.     dc_val= s->dc_val[0] + s->block_index[n];

  2178. 

  2179.     /* B A

  2180.      * C X

  2181.      */

  2182.     c = dc_val[ - 1];

  2183.     b = dc_val[ - 1 - wrap];

  2184.     a = dc_val[ - wrap];

  2185.     /* scale predictors if needed */

  2186.     q1 = s->current_picture.qscale_table[mb_pos];

  2187.     if(c_avail && (n!= 1 && n!=3)) {

  2188.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  2189.         if(q2 && q2 != q1)

  2190.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2191.     }

  2192.     if(a_avail && (n!= 2 && n!=3)) {

  2193.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2194.         if(q2 && q2 != q1)

  2195.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2196.     }

  2197.     if(a_avail && c_avail && (n!=3)) {

  2198.         int off = mb_pos;

  2199.         if(n != 1) off--;

  2200.         if(n != 2) off -= s->mb_stride;

  2201.         q2 = s->current_picture.qscale_table[off];

  2202.         if(q2 && q2 != q1)

  2203.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;

  2204.     }

  2205. 

  2206.     if(a_avail && c_avail) {

  2207.         if(abs(a - b) <= abs(b - c)) {

  2208.             pred = c;

  2209.             *dir_ptr = 1;//left

  2210.         } else {

  2211.             pred = a;

  2212.             *dir_ptr = 0;//top

  2213.         }

  2214.     } else if(a_avail) {

  2215.         pred = a;

  2216.         *dir_ptr = 0;//top

  2217.     } else if(c_avail) {

  2218.         pred = c;

  2219.         *dir_ptr = 1;//left

  2220.     } else {

  2221.         pred = 0;

  2222.         *dir_ptr = 1;//left

  2223.     }

  2224. 

  2225.     /* update predictor */

  2226.     *dc_val_ptr = &dc_val[0];

  2227.     return pred;

  2228. }

  2229. 

  2230. 

  2231. /**

  2232.  * @defgroup std_mb VC1 Macroblock-level functions in Simple/Main Profiles

  2233.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  2234.  * @{

  2235.  */

  2236. 

  2237. static inline int vc1_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)

  2238. {

  2239.     int xy, wrap, pred, a, b, c;

  2240. 

  2241.     xy = s->block_index[n];

  2242.     wrap = s->b8_stride;

  2243. 

  2244.     /* B C

  2245.      * A X

  2246.      */

  2247.     a = s->coded_block[xy - 1       ];

  2248.     b = s->coded_block[xy - 1 - wrap];

  2249.     c = s->coded_block[xy     - wrap];

  2250. 

  2251.     if (b == c) {

  2252.         pred = a;

  2253.     } else {

  2254.         pred = c;

  2255.     }

  2256. 

  2257.     /* store value */

  2258.     *coded_block_ptr = &s->coded_block[xy];

  2259. 

  2260.     return pred;

  2261. }

  2262. 

  2263. /**

  2264.  * Decode one AC coefficient

  2265.  * @param v The VC1 context

  2266.  * @param last Last coefficient

  2267.  * @param skip How much zero coefficients to skip

  2268.  * @param value Decoded AC coefficient value

  2269.  * @see 8.1.3.4

  2270.  */

  2271. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value, int codingset)

  2272. {

  2273.     GetBitContext *gb = &v->s.gb;

  2274.     int index, escape, run = 0, level = 0, lst = 0;

  2275. 

  2276.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2277.     if (index != vc1_ac_sizes[codingset] - 1) {

  2278.         run = vc1_index_decode_table[codingset][index][0];

  2279.         level = vc1_index_decode_table[codingset][index][1];

  2280.         lst = index >= vc1_last_decode_table[codingset];

  2281.         if(get_bits1(gb))

  2282.             level = -level;

  2283.     } else {

  2284.         escape = decode210(gb);

  2285.         if (escape != 2) {

  2286.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  2287.             run = vc1_index_decode_table[codingset][index][0];

  2288.             level = vc1_index_decode_table[codingset][index][1];

  2289.             lst = index >= vc1_last_decode_table[codingset];

  2290.             if(escape == 0) {

  2291.                 if(lst)

  2292.                     level += vc1_last_delta_level_table[codingset][run];

  2293.                 else

  2294.                     level += vc1_delta_level_table[codingset][run];

  2295.             } else {

  2296.                 if(lst)

  2297.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  2298.                 else

  2299.                     run += vc1_delta_run_table[codingset][level] + 1;

  2300.             }

  2301.             if(get_bits1(gb))

  2302.                 level = -level;

  2303.         } else {

  2304.             int sign;

  2305.             lst = get_bits1(gb);

  2306.             if(v->s.esc3_level_length == 0) {

  2307.                 if(v->pq < 8 || v->dquantfrm) { // table 59

  2308.                     v->s.esc3_level_length = get_bits(gb, 3);

  2309.                     if(!v->s.esc3_level_length)

  2310.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  2311.                 } else { //table 60

  2312.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  2313.                 }

  2314.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  2315.             }

  2316.             run = get_bits(gb, v->s.esc3_run_length);

  2317.             sign = get_bits1(gb);

  2318.             level = get_bits(gb, v->s.esc3_level_length);

  2319.             if(sign)

  2320.                 level = -level;

  2321.         }

  2322.     }

  2323. 

  2324.     *last = lst;

  2325.     *skip = run;

  2326.     *value = level;

  2327. }

  2328. 

  2329. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2330.  * @param v VC1Context

  2331.  * @param block block to decode

  2332.  * @param coded are AC coeffs present or not

  2333.  * @param codingset set of VLC to decode data

  2334.  */

  2335. static int vc1_decode_i_block(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

  2336. {

  2337.     GetBitContext *gb = &v->s.gb;

  2338.     MpegEncContext *s = &v->s;

  2339.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2340.     int run_diff, i;

  2341.     int16_t *dc_val;

  2342.     int16_t *ac_val, *ac_val2;

  2343.     int dcdiff;

  2344. 

  2345.     /* Get DC differential */

  2346.     if (n < 4) {

  2347.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2348.     } else {

  2349.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2350.     }

  2351.     if (dcdiff < 0){

  2352.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2353.         return -1;

  2354.     }

  2355.     if (dcdiff)

  2356.     {

  2357.         if (dcdiff == 119 /* ESC index value */)

  2358.         {

  2359.             /* TODO: Optimize */

  2360.             if (v->pq == 1) dcdiff = get_bits(gb, 10);

  2361.             else if (v->pq == 2) dcdiff = get_bits(gb, 9);

  2362.             else dcdiff = get_bits(gb, 8);

  2363.         }

  2364.         else

  2365.         {

  2366.             if (v->pq == 1)

  2367.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2368.             else if (v->pq == 2)

  2369.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2370.         }

  2371.         if (get_bits1(gb))

  2372.             dcdiff = -dcdiff;

  2373.     }

  2374. 

  2375.     /* Prediction */

  2376.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  2377.     *dc_val = dcdiff;

  2378. 

  2379.     /* Store the quantized DC coeff, used for prediction */

  2380.     if (n < 4) {

  2381.         block[0] = dcdiff * s->y_dc_scale;

  2382.     } else {

  2383.         block[0] = dcdiff * s->c_dc_scale;

  2384.     }

  2385.     /* Skip ? */

  2386.     run_diff = 0;

  2387.     i = 0;

  2388.     if (!coded) {

  2389.         goto not_coded;

  2390.     }

  2391. 

  2392.     //AC Decoding

  2393.     i = 1;

  2394. 

  2395.     {

  2396.         int last = 0, skip, value;

  2397.         const int8_t *zz_table;

  2398.         int scale;

  2399.         int k;

  2400. 

  2401.         scale = v->pq * 2 + v->halfpq;

  2402. 

  2403.         if(v->s.ac_pred) {

  2404.             if(!dc_pred_dir)

  2405.                 zz_table = ff_vc1_horizontal_zz;

  2406.             else

  2407.                 zz_table = ff_vc1_vertical_zz;

  2408.         } else

  2409.             zz_table = ff_vc1_normal_zz;

  2410. 

  2411.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2412.         ac_val2 = ac_val;

  2413.         if(dc_pred_dir) //left

  2414.             ac_val -= 16;

  2415.         else //top

  2416.             ac_val -= 16 * s->block_wrap[n];

  2417. 

  2418.         while (!last) {

  2419.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2420.             i += skip;

  2421.             if(i > 63)

  2422.                 break;

  2423.             block[zz_table[i++]] = value;

  2424.         }

  2425. 

  2426.         /* apply AC prediction if needed */

  2427.         if(s->ac_pred) {

  2428.             if(dc_pred_dir) { //left

  2429.                 for(k = 1; k < 8; k++)

  2430.                     block[k << 3] += ac_val[k];

  2431.             } else { //top

  2432.                 for(k = 1; k < 8; k++)

  2433.                     block[k] += ac_val[k + 8];

  2434.             }

  2435.         }

  2436.         /* save AC coeffs for further prediction */

  2437.         for(k = 1; k < 8; k++) {

  2438.             ac_val2[k] = block[k << 3];

  2439.             ac_val2[k + 8] = block[k];

  2440.         }

  2441. 

  2442.         /* scale AC coeffs */

  2443.         for(k = 1; k < 64; k++)

  2444.             if(block[k]) {

  2445.                 block[k] *= scale;

  2446.                 if(!v->pquantizer)

  2447.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2448.             }

  2449. 

  2450.         if(s->ac_pred) i = 63;

  2451.     }

  2452. 

  2453. not_coded:

  2454.     if(!coded) {

  2455.         int k, scale;

  2456.         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2457.         ac_val2 = ac_val;

  2458. 

  2459.         scale = v->pq * 2 + v->halfpq;

  2460.         memset(ac_val2, 0, 16 * 2);

  2461.         if(dc_pred_dir) {//left

  2462.             ac_val -= 16;

  2463.             if(s->ac_pred)

  2464.                 memcpy(ac_val2, ac_val, 8 * 2);

  2465.         } else {//top

  2466.             ac_val -= 16 * s->block_wrap[n];

  2467.             if(s->ac_pred)

  2468.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2469.         }

  2470. 

  2471.         /* apply AC prediction if needed */

  2472.         if(s->ac_pred) {

  2473.             if(dc_pred_dir) { //left

  2474.                 for(k = 1; k < 8; k++) {

  2475.                     block[k << 3] = ac_val[k] * scale;

  2476.                     if(!v->pquantizer && block[k << 3])

  2477.                         block[k << 3] += (block[k << 3] < 0) ? -v->pq : v->pq;

  2478.                 }

  2479.             } else { //top

  2480.                 for(k = 1; k < 8; k++) {

  2481.                     block[k] = ac_val[k + 8] * scale;

  2482.                     if(!v->pquantizer && block[k])

  2483.                         block[k] += (block[k] < 0) ? -v->pq : v->pq;

  2484.                 }

  2485.             }

  2486.             i = 63;

  2487.         }

  2488.     }

  2489.     s->block_last_index[n] = i;

  2490. 

  2491.     return 0;

  2492. }

  2493. 

  2494. /** Decode intra block in intra frames - should be faster than decode_intra_block

  2495.  * @param v VC1Context

  2496.  * @param block block to decode

  2497.  * @param coded are AC coeffs present or not

  2498.  * @param codingset set of VLC to decode data

  2499.  */

  2500. static int vc1_decode_i_block_adv(VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

  2501. {

  2502.     GetBitContext *gb = &v->s.gb;

  2503.     MpegEncContext *s = &v->s;

  2504.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2505.     int run_diff, i;

  2506.     int16_t *dc_val;

  2507.     int16_t *ac_val, *ac_val2;

  2508.     int dcdiff;

  2509.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2510.     int use_pred = s->ac_pred;

  2511.     int scale;

  2512.     int q1, q2 = 0;

  2513.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2514. 

  2515.     /* Get DC differential */

  2516.     if (n < 4) {

  2517.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2518.     } else {

  2519.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2520.     }

  2521.     if (dcdiff < 0){

  2522.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2523.         return -1;

  2524.     }

  2525.     if (dcdiff)

  2526.     {

  2527.         if (dcdiff == 119 /* ESC index value */)

  2528.         {

  2529.             /* TODO: Optimize */

  2530.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2531.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2532.             else dcdiff = get_bits(gb, 8);

  2533.         }

  2534.         else

  2535.         {

  2536.             if (mquant == 1)

  2537.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2538.             else if (mquant == 2)

  2539.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2540.         }

  2541.         if (get_bits1(gb))

  2542.             dcdiff = -dcdiff;

  2543.     }

  2544. 

  2545.     /* Prediction */

  2546.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  2547.     *dc_val = dcdiff;

  2548. 

  2549.     /* Store the quantized DC coeff, used for prediction */

  2550.     if (n < 4) {

  2551.         block[0] = dcdiff * s->y_dc_scale;

  2552.     } else {

  2553.         block[0] = dcdiff * s->c_dc_scale;

  2554.     }

  2555.     /* Skip ? */

  2556.     run_diff = 0;

  2557.     i = 0;

  2558. 

  2559.     //AC Decoding

  2560.     i = 1;

  2561. 

  2562.     /* check if AC is needed at all */

  2563.     if(!a_avail && !c_avail) use_pred = 0;

  2564.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2565.     ac_val2 = ac_val;

  2566. 

  2567.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  2568. 

  2569.     if(dc_pred_dir) //left

  2570.         ac_val -= 16;

  2571.     else //top

  2572.         ac_val -= 16 * s->block_wrap[n];

  2573. 

  2574.     q1 = s->current_picture.qscale_table[mb_pos];

  2575.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2576.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2577.     if(dc_pred_dir && n==1) q2 = q1;

  2578.     if(!dc_pred_dir && n==2) q2 = q1;

  2579.     if(n==3) q2 = q1;

  2580. 

  2581.     if(coded) {

  2582.         int last = 0, skip, value;

  2583.         const int8_t *zz_table;

  2584.         int k;

  2585. 

  2586.         if(v->s.ac_pred) {

  2587.             if(!dc_pred_dir)

  2588.                 zz_table = ff_vc1_horizontal_zz;

  2589.             else

  2590.                 zz_table = ff_vc1_vertical_zz;

  2591.         } else

  2592.             zz_table = ff_vc1_normal_zz;

  2593. 

  2594.         while (!last) {

  2595.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2596.             i += skip;

  2597.             if(i > 63)

  2598.                 break;

  2599.             block[zz_table[i++]] = value;

  2600.         }

  2601. 

  2602.         /* apply AC prediction if needed */

  2603.         if(use_pred) {

  2604.             /* scale predictors if needed*/

  2605.             if(q2 && q1!=q2) {

  2606.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2607.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2608. 

  2609.                 if(dc_pred_dir) { //left

  2610.                     for(k = 1; k < 8; k++)

  2611.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2612.                 } else { //top

  2613.                     for(k = 1; k < 8; k++)

  2614.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2615.                 }

  2616.             } else {

  2617.                 if(dc_pred_dir) { //left

  2618.                     for(k = 1; k < 8; k++)

  2619.                         block[k << 3] += ac_val[k];

  2620.                 } else { //top

  2621.                     for(k = 1; k < 8; k++)

  2622.                         block[k] += ac_val[k + 8];

  2623.                 }

  2624.             }

  2625.         }

  2626.         /* save AC coeffs for further prediction */

  2627.         for(k = 1; k < 8; k++) {

  2628.             ac_val2[k] = block[k << 3];

  2629.             ac_val2[k + 8] = block[k];

  2630.         }

  2631. 

  2632.         /* scale AC coeffs */

  2633.         for(k = 1; k < 64; k++)

  2634.             if(block[k]) {

  2635.                 block[k] *= scale;

  2636.                 if(!v->pquantizer)

  2637.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2638.             }

  2639. 

  2640.         if(use_pred) i = 63;

  2641.     } else { // no AC coeffs

  2642.         int k;

  2643. 

  2644.         memset(ac_val2, 0, 16 * 2);

  2645.         if(dc_pred_dir) {//left

  2646.             if(use_pred) {

  2647.                 memcpy(ac_val2, ac_val, 8 * 2);

  2648.                 if(q2 && q1!=q2) {

  2649.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2650.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2651.                     for(k = 1; k < 8; k++)

  2652.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2653.                 }

  2654.             }

  2655.         } else {//top

  2656.             if(use_pred) {

  2657.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2658.                 if(q2 && q1!=q2) {

  2659.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2660.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2661.                     for(k = 1; k < 8; k++)

  2662.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2663.                 }

  2664.             }

  2665.         }

  2666. 

  2667.         /* apply AC prediction if needed */

  2668.         if(use_pred) {

  2669.             if(dc_pred_dir) { //left

  2670.                 for(k = 1; k < 8; k++) {

  2671.                     block[k << 3] = ac_val2[k] * scale;

  2672.                     if(!v->pquantizer && block[k << 3])

  2673.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2674.                 }

  2675.             } else { //top

  2676.                 for(k = 1; k < 8; k++) {

  2677.                     block[k] = ac_val2[k + 8] * scale;

  2678.                     if(!v->pquantizer && block[k])

  2679.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2680.                 }

  2681.             }

  2682.             i = 63;

  2683.         }

  2684.     }

  2685.     s->block_last_index[n] = i;

  2686. 

  2687.     return 0;

  2688. }

  2689. 

  2690. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  2691.  * @param v VC1Context

  2692.  * @param block block to decode

  2693.  * @param coded are AC coeffs present or not

  2694.  * @param mquant block quantizer

  2695.  * @param codingset set of VLC to decode data

  2696.  */

  2697. static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

  2698. {

  2699.     GetBitContext *gb = &v->s.gb;

  2700.     MpegEncContext *s = &v->s;

  2701.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  2702.     int run_diff, i;

  2703.     int16_t *dc_val;

  2704.     int16_t *ac_val, *ac_val2;

  2705.     int dcdiff;

  2706.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2707.     int a_avail = v->a_avail, c_avail = v->c_avail;

  2708.     int use_pred = s->ac_pred;

  2709.     int scale;

  2710.     int q1, q2 = 0;

  2711. 

  2712.     /* XXX: Guard against dumb values of mquant */

  2713.     mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

  2714. 

  2715.     /* Set DC scale - y and c use the same */

  2716.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  2717.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  2718. 

  2719.     /* Get DC differential */

  2720.     if (n < 4) {

  2721.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2722.     } else {

  2723.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  2724.     }

  2725.     if (dcdiff < 0){

  2726.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  2727.         return -1;

  2728.     }

  2729.     if (dcdiff)

  2730.     {

  2731.         if (dcdiff == 119 /* ESC index value */)

  2732.         {

  2733.             /* TODO: Optimize */

  2734.             if (mquant == 1) dcdiff = get_bits(gb, 10);

  2735.             else if (mquant == 2) dcdiff = get_bits(gb, 9);

  2736.             else dcdiff = get_bits(gb, 8);

  2737.         }

  2738.         else

  2739.         {

  2740.             if (mquant == 1)

  2741.                 dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;

  2742.             else if (mquant == 2)

  2743.                 dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;

  2744.         }

  2745.         if (get_bits1(gb))

  2746.             dcdiff = -dcdiff;

  2747.     }

  2748. 

  2749.     /* Prediction */

  2750.     dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  2751.     *dc_val = dcdiff;

  2752. 

  2753.     /* Store the quantized DC coeff, used for prediction */

  2754. 

  2755.     if (n < 4) {

  2756.         block[0] = dcdiff * s->y_dc_scale;

  2757.     } else {

  2758.         block[0] = dcdiff * s->c_dc_scale;

  2759.     }

  2760.     /* Skip ? */

  2761.     run_diff = 0;

  2762.     i = 0;

  2763. 

  2764.     //AC Decoding

  2765.     i = 1;

  2766. 

  2767.     /* check if AC is needed at all and adjust direction if needed */

  2768.     if(!a_avail) dc_pred_dir = 1;

  2769.     if(!c_avail) dc_pred_dir = 0;

  2770.     if(!a_avail && !c_avail) use_pred = 0;

  2771.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  2772.     ac_val2 = ac_val;

  2773. 

  2774.     scale = mquant * 2 + v->halfpq;

  2775. 

  2776.     if(dc_pred_dir) //left

  2777.         ac_val -= 16;

  2778.     else //top

  2779.         ac_val -= 16 * s->block_wrap[n];

  2780. 

  2781.     q1 = s->current_picture.qscale_table[mb_pos];

  2782.     if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];

  2783.     if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  2784.     if(dc_pred_dir && n==1) q2 = q1;

  2785.     if(!dc_pred_dir && n==2) q2 = q1;

  2786.     if(n==3) q2 = q1;

  2787. 

  2788.     if(coded) {

  2789.         int last = 0, skip, value;

  2790.         const int8_t *zz_table;

  2791.         int k;

  2792. 

  2793.         zz_table = ff_vc1_simple_progressive_8x8_zz;

  2794. 

  2795.         while (!last) {

  2796.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  2797.             i += skip;

  2798.             if(i > 63)

  2799.                 break;

  2800.             block[zz_table[i++]] = value;

  2801.         }

  2802. 

  2803.         /* apply AC prediction if needed */

  2804.         if(use_pred) {

  2805.             /* scale predictors if needed*/

  2806.             if(q2 && q1!=q2) {

  2807.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2808.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2809. 

  2810.                 if(dc_pred_dir) { //left

  2811.                     for(k = 1; k < 8; k++)

  2812.                         block[k << 3] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2813.                 } else { //top

  2814.                     for(k = 1; k < 8; k++)

  2815.                         block[k] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2816.                 }

  2817.             } else {

  2818.                 if(dc_pred_dir) { //left

  2819.                     for(k = 1; k < 8; k++)

  2820.                         block[k << 3] += ac_val[k];

  2821.                 } else { //top

  2822.                     for(k = 1; k < 8; k++)

  2823.                         block[k] += ac_val[k + 8];

  2824.                 }

  2825.             }

  2826.         }

  2827.         /* save AC coeffs for further prediction */

  2828.         for(k = 1; k < 8; k++) {

  2829.             ac_val2[k] = block[k << 3];

  2830.             ac_val2[k + 8] = block[k];

  2831.         }

  2832. 

  2833.         /* scale AC coeffs */

  2834.         for(k = 1; k < 64; k++)

  2835.             if(block[k]) {

  2836.                 block[k] *= scale;

  2837.                 if(!v->pquantizer)

  2838.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  2839.             }

  2840. 

  2841.         if(use_pred) i = 63;

  2842.     } else { // no AC coeffs

  2843.         int k;

  2844. 

  2845.         memset(ac_val2, 0, 16 * 2);

  2846.         if(dc_pred_dir) {//left

  2847.             if(use_pred) {

  2848.                 memcpy(ac_val2, ac_val, 8 * 2);

  2849.                 if(q2 && q1!=q2) {

  2850.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2851.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2852.                     for(k = 1; k < 8; k++)

  2853.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2854.                 }

  2855.             }

  2856.         } else {//top

  2857.             if(use_pred) {

  2858.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  2859.                 if(q2 && q1!=q2) {

  2860.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  2861.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  2862.                     for(k = 1; k < 8; k++)

  2863.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  2864.                 }

  2865.             }

  2866.         }

  2867. 

  2868.         /* apply AC prediction if needed */

  2869.         if(use_pred) {

  2870.             if(dc_pred_dir) { //left

  2871.                 for(k = 1; k < 8; k++) {

  2872.                     block[k << 3] = ac_val2[k] * scale;

  2873.                     if(!v->pquantizer && block[k << 3])

  2874.                         block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;

  2875.                 }

  2876.             } else { //top

  2877.                 for(k = 1; k < 8; k++) {

  2878.                     block[k] = ac_val2[k + 8] * scale;

  2879.                     if(!v->pquantizer && block[k])

  2880.                         block[k] += (block[k] < 0) ? -mquant : mquant;

  2881.                 }

  2882.             }

  2883.             i = 63;

  2884.         }

  2885.     }

  2886.     s->block_last_index[n] = i;

  2887. 

  2888.     return 0;

  2889. }

  2890. 

  2891. /** Decode P block

  2892.  */

  2893. static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)

  2894. {

  2895.     MpegEncContext *s = &v->s;

  2896.     GetBitContext *gb = &s->gb;

  2897.     int i, j;

  2898.     int subblkpat = 0;

  2899.     int scale, off, idx, last, skip, value;

  2900.     int ttblk = ttmb & 7;

  2901. 

  2902.     if(ttmb == -1) {

  2903.         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)];

  2904.     }

  2905.     if(ttblk == TT_4X4) {

  2906.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  2907.     }

  2908.     if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {

  2909.         subblkpat = decode012(gb);

  2910.         if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits

  2911.         if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;

  2912.         if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;

  2913.     }

  2914.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  2915. 

  2916.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  2917.     if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  2918.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  2919.         ttblk = TT_8X4;

  2920.     }

  2921.     if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  2922.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  2923.         ttblk = TT_4X8;

  2924.     }

  2925.     switch(ttblk) {

  2926.     case TT_8X8:

  2927.         i = 0;

  2928.         last = 0;

  2929.         while (!last) {

  2930.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2931.             i += skip;

  2932.             if(i > 63)

  2933.                 break;

  2934.             idx = ff_vc1_simple_progressive_8x8_zz[i++];

  2935.             block[idx] = value * scale;

  2936.             if(!v->pquantizer)

  2937.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  2938.         }

  2939.         s->dsp.vc1_inv_trans_8x8(block);

  2940.         break;

  2941.     case TT_4X4:

  2942.         for(j = 0; j < 4; j++) {

  2943.             last = subblkpat & (1 << (3 - j));

  2944.             i = 0;

  2945.             off = (j & 1) * 4 + (j & 2) * 16;

  2946.             while (!last) {

  2947.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2948.                 i += skip;

  2949.                 if(i > 15)

  2950.                     break;

  2951.                 idx = ff_vc1_simple_progressive_4x4_zz[i++];

  2952.                 block[idx + off] = value * scale;

  2953.                 if(!v->pquantizer)

  2954.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2955.             }

  2956.             if(!(subblkpat & (1 << (3 - j))))

  2957.                 s->dsp.vc1_inv_trans_4x4(block, j);

  2958.         }

  2959.         break;

  2960.     case TT_8X4:

  2961.         for(j = 0; j < 2; j++) {

  2962.             last = subblkpat & (1 << (1 - j));

  2963.             i = 0;

  2964.             off = j * 32;

  2965.             while (!last) {

  2966.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2967.                 i += skip;

  2968.                 if(i > 31)

  2969.                     break;

  2970.                 if(v->profile < PROFILE_ADVANCED)

  2971.                     idx = ff_vc1_simple_progressive_8x4_zz[i++];

  2972.                 else

  2973.                     idx = ff_vc1_adv_progressive_8x4_zz[i++];

  2974.                 block[idx + off] = value * scale;

  2975.                 if(!v->pquantizer)

  2976.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2977.             }

  2978.             if(!(subblkpat & (1 << (1 - j))))

  2979.                 s->dsp.vc1_inv_trans_8x4(block, j);

  2980.         }

  2981.         break;

  2982.     case TT_4X8:

  2983.         for(j = 0; j < 2; j++) {

  2984.             last = subblkpat & (1 << (1 - j));

  2985.             i = 0;

  2986.             off = j * 4;

  2987.             while (!last) {

  2988.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  2989.                 i += skip;

  2990.                 if(i > 31)

  2991.                     break;

  2992.                 if(v->profile < PROFILE_ADVANCED)

  2993.                     idx = ff_vc1_simple_progressive_4x8_zz[i++];

  2994.                 else

  2995.                     idx = ff_vc1_adv_progressive_4x8_zz[i++];

  2996.                 block[idx + off] = value * scale;

  2997.                 if(!v->pquantizer)

  2998.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  2999.             }

  3000.             if(!(subblkpat & (1 << (1 - j))))

  3001.                 s->dsp.vc1_inv_trans_4x8(block, j);

  3002.         }

  3003.         break;

  3004.     }

  3005.     return 0;

  3006. }

  3007. 

  3008. 

  3009. /** Decode one P-frame MB (in Simple/Main profile)

  3010.  */

  3011. static int vc1_decode_p_mb(VC1Context *v)

  3012. {

  3013.     MpegEncContext *s = &v->s;

  3014.     GetBitContext *gb = &s->gb;

  3015.     int i, j;

  3016.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3017.     int cbp; /* cbp decoding stuff */

  3018.     int mqdiff, mquant; /* MB quantization */

  3019.     int ttmb = v->ttfrm; /* MB Transform type */

  3020.     int status;

  3021. 

  3022.     static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },

  3023.       offset_table[6] = { 0, 1, 3, 7, 15, 31 };

  3024.     int mb_has_coeffs = 1; /* last_flag */

  3025.     int dmv_x, dmv_y; /* Differential MV components */

  3026.     int index, index1; /* LUT indices */

  3027.     int val, sign; /* temp values */

  3028.     int first_block = 1;

  3029.     int dst_idx, off;

  3030.     int skipped, fourmv;

  3031. 

  3032.     mquant = v->pq; /* Loosy initialization */

  3033. 

  3034.     if (v->mv_type_is_raw)

  3035.         fourmv = get_bits1(gb);

  3036.     else

  3037.         fourmv = v->mv_type_mb_plane[mb_pos];

  3038.     if (v->skip_is_raw)

  3039.         skipped = get_bits1(gb);

  3040.     else

  3041.         skipped = v->s.mbskip_table[mb_pos];

  3042. 

  3043.     s->dsp.clear_blocks(s->block[0]);

  3044. 

  3045.     if (!fourmv) /* 1MV mode */

  3046.     {

  3047.         if (!skipped)

  3048.         {

  3049.             GET_MVDATA(dmv_x, dmv_y);

  3050. 

  3051.             if (s->mb_intra) {

  3052.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3053.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3054.             }

  3055.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  3056.             vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

  3057. 

  3058.             /* FIXME Set DC val for inter block ? */

  3059.             if (s->mb_intra && !mb_has_coeffs)

  3060.             {

  3061.                 GET_MQUANT();

  3062.                 s->ac_pred = get_bits1(gb);

  3063.                 cbp = 0;

  3064.             }

  3065.             else if (mb_has_coeffs)

  3066.             {

  3067.                 if (s->mb_intra) s->ac_pred = get_bits1(gb);

  3068.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3069.                 GET_MQUANT();

  3070.             }

  3071.             else

  3072.             {

  3073.                 mquant = v->pq;

  3074.                 cbp = 0;

  3075.             }

  3076.             s->current_picture.qscale_table[mb_pos] = mquant;

  3077. 

  3078.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  3079.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  3080.                                 VC1_TTMB_VLC_BITS, 2);

  3081.             if(!s->mb_intra) vc1_mc_1mv(v, 0);

  3082.             dst_idx = 0;

  3083.             for (i=0; i<6; i++)

  3084.             {

  3085.                 s->dc_val[0][s->block_index[i]] = 0;

  3086.                 dst_idx += i >> 2;

  3087.                 val = ((cbp >> (5 - i)) & 1);

  3088.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3089.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  3090.                 if(s->mb_intra) {

  3091.                     /* check if prediction blocks A and C are available */

  3092.                     v->a_avail = v->c_avail = 0;

  3093.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3094.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3095.                     if(i == 1 || i == 3 || s->mb_x)

  3096.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3097. 

  3098.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);

  3099.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3100.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3101.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3102.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  3103.                     s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3104.                     if(v->pq >= 9 && v->overlap) {

  3105.                         if(v->c_avail)

  3106.                             s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3107.                         if(v->a_avail)

  3108.                             s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));

  3109.                     }

  3110.                 } else if(val) {

  3111.                     vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);

  3112.                     if(!v->ttmbf && ttmb < 8) ttmb = -1;

  3113.                     first_block = 0;

  3114.                     if((i<4) || !(s->flags & CODEC_FLAG_GRAY))

  3115.                         s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);

  3116.                 }

  3117.             }

  3118.         }

  3119.         else //Skipped

  3120.         {

  3121.             s->mb_intra = 0;

  3122.             for(i = 0; i < 6; i++) {

  3123.                 v->mb_type[0][s->block_index[i]] = 0;

  3124.                 s->dc_val[0][s->block_index[i]] = 0;

  3125.             }

  3126.             s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;

  3127.             s->current_picture.qscale_table[mb_pos] = 0;

  3128.             vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);

  3129.             vc1_mc_1mv(v, 0);

  3130.             return 0;

  3131.         }

  3132.     } //1MV mode

  3133.     else //4MV mode

  3134.     {

  3135.         if (!skipped /* unskipped MB */)

  3136.         {

  3137.             int intra_count = 0, coded_inter = 0;

  3138.             int is_intra[6], is_coded[6];

  3139.             /* Get CBPCY */

  3140.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  3141.             for (i=0; i<6; i++)

  3142.             {

  3143.                 val = ((cbp >> (5 - i)) & 1);

  3144.                 s->dc_val[0][s->block_index[i]] = 0;

  3145.                 s->mb_intra = 0;

  3146.                 if(i < 4) {

  3147.                     dmv_x = dmv_y = 0;

  3148.                     s->mb_intra = 0;

  3149.                     mb_has_coeffs = 0;

  3150.                     if(val) {

  3151.                         GET_MVDATA(dmv_x, dmv_y);

  3152.                     }

  3153.                     vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);

  3154.                     if(!s->mb_intra) vc1_mc_4mv_luma(v, i);

  3155.                     intra_count += s->mb_intra;

  3156.                     is_intra[i] = s->mb_intra;

  3157.                     is_coded[i] = mb_has_coeffs;

  3158.                 }

  3159.                 if(i&4){

  3160.                     is_intra[i] = (intra_count >= 3);

  3161.                     is_coded[i] = val;

  3162.                 }

  3163.                 if(i == 4) vc1_mc_4mv_chroma(v);

  3164.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  3165.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];

  3166.             }

  3167.             // if there are no coded blocks then don't do anything more

  3168.             if(!intra_count && !coded_inter) return 0;

  3169.             dst_idx = 0;

  3170.             GET_MQUANT();

  3171.             s->current_picture.qscale_table[mb_pos] = mquant;

  3172.             /* test if block is intra and has pred */

  3173.             {

  3174.                 int intrapred = 0;

  3175.                 for(i=0; i<6; i++)

  3176.                     if(is_intra[i]) {

  3177.                         if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  3178.                             || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {

  3179.                             intrapred = 1;

  3180.                             break;

  3181.                         }

  3182.                     }

  3183.                 if(intrapred)s->ac_pred = get_bits1(gb);

  3184.                 else s->ac_pred = 0;

  3185.             }

  3186.             if (!v->ttmbf && coded_inter)

  3187.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  3188.             for (i=0; i<6; i++)

  3189.             {

  3190.                 dst_idx += i >> 2;

  3191.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  3192.                 s->mb_intra = is_intra[i];

  3193.                 if (is_intra[i]) {

  3194.                     /* check if prediction blocks A and C are available */

  3195.                     v->a_avail = v->c_avail = 0;

  3196.                     if(i == 2 || i == 3 || !s->first_slice_line)

  3197.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  3198.                     if(i == 1 || i == 3 || s->mb_x)

  3199.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  3200. 

  3201.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);

  3202.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  3203.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);

  3204.                     if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;

  3205.                     for(j = 0; j < 64; j++) s->block[i][j] += 128;

  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->pq >= 9 && v->overlap) {

  3470.                     for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3471.                 }

  3472.             }

  3473. 

  3474.             vc1_put_block(v, s->block);

  3475.             if(v->pq >= 9 && v->overlap) {

  3476.                 if(s->mb_x) {

  3477.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3478.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3479.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3480.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3481.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3482.                     }

  3483.                 }

  3484.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3485.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3486.                 if(!s->first_slice_line) {

  3487.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3488.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3489.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3490.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3491.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3492.                     }

  3493.                 }

  3494.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3495.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3496.             }

  3497. 

  3498.             if(get_bits_count(&s->gb) > v->bits) {

  3499.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3500.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3501.                 return;

  3502.             }

  3503.         }

  3504.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3505.         s->first_slice_line = 0;

  3506.     }

  3507.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3508. }

  3509. 

  3510. /** Decode blocks of I-frame for advanced profile

  3511.  */

  3512. static void vc1_decode_i_blocks_adv(VC1Context *v)

  3513. {

  3514.     int k, j;

  3515.     MpegEncContext *s = &v->s;

  3516.     int cbp, val;

  3517.     uint8_t *coded_val;

  3518.     int mb_pos;

  3519.     int mquant = v->pq;

  3520.     int mqdiff;

  3521.     int overlap;

  3522.     GetBitContext *gb = &s->gb;

  3523. 

  3524.     /* select codingmode used for VLC tables selection */

  3525.     switch(v->y_ac_table_index){

  3526.     case 0:

  3527.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3528.         break;

  3529.     case 1:

  3530.         v->codingset = CS_HIGH_MOT_INTRA;

  3531.         break;

  3532.     case 2:

  3533.         v->codingset = CS_MID_RATE_INTRA;

  3534.         break;

  3535.     }

  3536. 

  3537.     switch(v->c_ac_table_index){

  3538.     case 0:

  3539.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3540.         break;

  3541.     case 1:

  3542.         v->codingset2 = CS_HIGH_MOT_INTER;

  3543.         break;

  3544.     case 2:

  3545.         v->codingset2 = CS_MID_RATE_INTER;

  3546.         break;

  3547.     }

  3548. 

  3549.     //do frame decode

  3550.     s->mb_x = s->mb_y = 0;

  3551.     s->mb_intra = 1;

  3552.     s->first_slice_line = 1;

  3553.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3554.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3555.             ff_init_block_index(s);

  3556.             ff_update_block_index(s);

  3557.             s->dsp.clear_blocks(s->block[0]);

  3558.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  3559.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  3560.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  3561.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  3562. 

  3563.             // do actual MB decoding and displaying

  3564.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  3565.             if(v->acpred_is_raw)

  3566.                 v->s.ac_pred = get_bits1(&v->s.gb);

  3567.             else

  3568.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  3569. 

  3570.             if(v->condover == CONDOVER_SELECT) {

  3571.                 if(v->overflg_is_raw)

  3572.                     overlap = get_bits1(&v->s.gb);

  3573.                 else

  3574.                     overlap = v->over_flags_plane[mb_pos];

  3575.             } else

  3576.                 overlap = (v->condover == CONDOVER_ALL);

  3577. 

  3578.             GET_MQUANT();

  3579. 

  3580.             s->current_picture.qscale_table[mb_pos] = mquant;

  3581.             /* Set DC scale - y and c use the same */

  3582.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  3583.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  3584. 

  3585.             for(k = 0; k < 6; k++) {

  3586.                 val = ((cbp >> (5 - k)) & 1);

  3587. 

  3588.                 if (k < 4) {

  3589.                     int pred = vc1_coded_block_pred(&v->s, k, &coded_val);

  3590.                     val = val ^ pred;

  3591.                     *coded_val = val;

  3592.                 }

  3593.                 cbp |= val << (5 - k);

  3594. 

  3595.                 v->a_avail = !s->first_slice_line || (k==2 || k==3);

  3596.                 v->c_avail = !!s->mb_x || (k==1 || k==3);

  3597. 

  3598.                 vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

  3599. 

  3600.                 s->dsp.vc1_inv_trans_8x8(s->block[k]);

  3601.                 for(j = 0; j < 64; j++) s->block[k][j] += 128;

  3602.             }

  3603. 

  3604.             vc1_put_block(v, s->block);

  3605.             if(overlap) {

  3606.                 if(s->mb_x) {

  3607.                     s->dsp.vc1_h_overlap(s->dest[0], s->linesize);

  3608.                     s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3609.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3610.                         s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  3611.                         s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  3612.                     }

  3613.                 }

  3614.                 s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  3615.                 s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3616.                 if(!s->first_slice_line) {

  3617.                     s->dsp.vc1_v_overlap(s->dest[0], s->linesize);

  3618.                     s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  3619.                     if(!(s->flags & CODEC_FLAG_GRAY)) {

  3620.                         s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  3621.                         s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  3622.                     }

  3623.                 }

  3624.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  3625.                 s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  3626.             }

  3627. 

  3628.             if(get_bits_count(&s->gb) > v->bits) {

  3629.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3630.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);

  3631.                 return;

  3632.             }

  3633.         }

  3634.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3635.         s->first_slice_line = 0;

  3636.     }

  3637.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3638. }

  3639. 

  3640. static void vc1_decode_p_blocks(VC1Context *v)

  3641. {

  3642.     MpegEncContext *s = &v->s;

  3643. 

  3644.     /* select codingmode used for VLC tables selection */

  3645.     switch(v->c_ac_table_index){

  3646.     case 0:

  3647.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3648.         break;

  3649.     case 1:

  3650.         v->codingset = CS_HIGH_MOT_INTRA;

  3651.         break;

  3652.     case 2:

  3653.         v->codingset = CS_MID_RATE_INTRA;

  3654.         break;

  3655.     }

  3656. 

  3657.     switch(v->c_ac_table_index){

  3658.     case 0:

  3659.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3660.         break;

  3661.     case 1:

  3662.         v->codingset2 = CS_HIGH_MOT_INTER;

  3663.         break;

  3664.     case 2:

  3665.         v->codingset2 = CS_MID_RATE_INTER;

  3666.         break;

  3667.     }

  3668. 

  3669.     s->first_slice_line = 1;

  3670.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3671.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3672.             ff_init_block_index(s);

  3673.             ff_update_block_index(s);

  3674.             s->dsp.clear_blocks(s->block[0]);

  3675. 

  3676.             vc1_decode_p_mb(v);

  3677.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3678.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3679.                 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);

  3680.                 return;

  3681.             }

  3682.         }

  3683.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3684.         s->first_slice_line = 0;

  3685.     }

  3686.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3687. }

  3688. 

  3689. static void vc1_decode_b_blocks(VC1Context *v)

  3690. {

  3691.     MpegEncContext *s = &v->s;

  3692. 

  3693.     /* select codingmode used for VLC tables selection */

  3694.     switch(v->c_ac_table_index){

  3695.     case 0:

  3696.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  3697.         break;

  3698.     case 1:

  3699.         v->codingset = CS_HIGH_MOT_INTRA;

  3700.         break;

  3701.     case 2:

  3702.         v->codingset = CS_MID_RATE_INTRA;

  3703.         break;

  3704.     }

  3705. 

  3706.     switch(v->c_ac_table_index){

  3707.     case 0:

  3708.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  3709.         break;

  3710.     case 1:

  3711.         v->codingset2 = CS_HIGH_MOT_INTER;

  3712.         break;

  3713.     case 2:

  3714.         v->codingset2 = CS_MID_RATE_INTER;

  3715.         break;

  3716.     }

  3717. 

  3718.     s->first_slice_line = 1;

  3719.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3720.         for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  3721.             ff_init_block_index(s);

  3722.             ff_update_block_index(s);

  3723.             s->dsp.clear_blocks(s->block[0]);

  3724. 

  3725.             vc1_decode_b_mb(v);

  3726.             if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  3727.                 ff_er_add_slice(s, 0, 0, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END));

  3728.                 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);

  3729.                 return;

  3730.             }

  3731.         }

  3732.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3733.         s->first_slice_line = 0;

  3734.     }

  3735.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3736. }

  3737. 

  3738. static void vc1_decode_skip_blocks(VC1Context *v)

  3739. {

  3740.     MpegEncContext *s = &v->s;

  3741. 

  3742.     ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));

  3743.     s->first_slice_line = 1;

  3744.     for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  3745.         s->mb_x = 0;

  3746.         ff_init_block_index(s);

  3747.         ff_update_block_index(s);

  3748.         memcpy(s->dest[0], s->last_picture.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);

  3749.         memcpy(s->dest[1], s->last_picture.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3750.         memcpy(s->dest[2], s->last_picture.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);

  3751.         ff_draw_horiz_band(s, s->mb_y * 16, 16);

  3752.         s->first_slice_line = 0;

  3753.     }

  3754.     s->pict_type = P_TYPE;

  3755. }

  3756. 

  3757. static void vc1_decode_blocks(VC1Context *v)

  3758. {

  3759. 

  3760.     v->s.esc3_level_length = 0;

  3761.     if(v->x8_type){

  3762.         ff_intrax8_decode_picture(&v->x8, 2*v->pq+v->halfpq, v->pq*(!v->pquantizer) );

  3763.     }else

  3764. 

  3765.     switch(v->s.pict_type) {

  3766.     case I_TYPE:

  3767.         if(v->profile == PROFILE_ADVANCED)

  3768.             vc1_decode_i_blocks_adv(v);

  3769.         else

  3770.             vc1_decode_i_blocks(v);

  3771.         break;

  3772.     case P_TYPE:

  3773.         if(v->p_frame_skipped)

  3774.             vc1_decode_skip_blocks(v);

  3775.         else

  3776.             vc1_decode_p_blocks(v);

  3777.         break;

  3778.     case B_TYPE:

  3779.         if(v->bi_type){

  3780.             if(v->profile == PROFILE_ADVANCED)

  3781.                 vc1_decode_i_blocks_adv(v);

  3782.             else

  3783.                 vc1_decode_i_blocks(v);

  3784.         }else

  3785.             vc1_decode_b_blocks(v);

  3786.         break;

  3787.     }

  3788. }

  3789. 

  3790. /** Find VC-1 marker in buffer

  3791.  * @return position where next marker starts or end of buffer if no marker found

  3792.  */

  3793. static av_always_inline uint8_t* find_next_marker(uint8_t *src, uint8_t *end)

  3794. {

  3795.     uint32_t mrk = 0xFFFFFFFF;

  3796. 

  3797.     if(end-src < 4) return end;

  3798.     while(src < end){

  3799.         mrk = (mrk << 8) | *src++;

  3800.         if(IS_MARKER(mrk))

  3801.             return src-4;

  3802.     }

  3803.     return end;

  3804. }

  3805. 

  3806. static av_always_inline int vc1_unescape_buffer(uint8_t *src, int size, uint8_t *dst)

  3807. {

  3808.     int dsize = 0, i;

  3809. 

  3810.     if(size < 4){

  3811.         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;

  3812.         return size;

  3813.     }

  3814.     for(i = 0; i < size; i++, src++) {

  3815.         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {

  3816.             dst[dsize++] = src[1];

  3817.             src++;

  3818.             i++;

  3819.         } else

  3820.             dst[dsize++] = *src;

  3821.     }

  3822.     return dsize;

  3823. }

  3824. 

  3825. /** Initialize a VC1/WMV3 decoder

  3826.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3827.  * @todo TODO: Decypher remaining bits in extra_data

  3828.  */

  3829. static int vc1_decode_init(AVCodecContext *avctx)

  3830. {

  3831.     VC1Context *v = avctx->priv_data;

  3832.     MpegEncContext *s = &v->s;

  3833.     GetBitContext gb;

  3834. 

  3835.     if (!avctx->extradata_size || !avctx->extradata) return -1;

  3836.     if (!(avctx->flags & CODEC_FLAG_GRAY))

  3837.         avctx->pix_fmt = PIX_FMT_YUV420P;

  3838.     else

  3839.         avctx->pix_fmt = PIX_FMT_GRAY8;

  3840.     v->s.avctx = avctx;

  3841.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  3842.     v->s.flags |= CODEC_FLAG_EMU_EDGE;

  3843. 

  3844.     if(avctx->idct_algo==FF_IDCT_AUTO){

  3845.         avctx->idct_algo=FF_IDCT_WMV2;

  3846.     }

  3847. 

  3848.     if(ff_h263_decode_init(avctx) < 0)

  3849.         return -1;

  3850.     if (vc1_init_common(v) < 0) return -1;

  3851. 

  3852.     avctx->coded_width = avctx->width;

  3853.     avctx->coded_height = avctx->height;

  3854.     if (avctx->codec_id == CODEC_ID_WMV3)

  3855.     {

  3856.         int count = 0;

  3857. 

  3858.         // looks like WMV3 has a sequence header stored in the extradata

  3859.         // advanced sequence header may be before the first frame

  3860.         // the last byte of the extradata is a version number, 1 for the

  3861.         // samples we can decode

  3862. 

  3863.         init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);

  3864. 

  3865.         if (decode_sequence_header(avctx, &gb) < 0)

  3866.           return -1;

  3867. 

  3868.         count = avctx->extradata_size*8 - get_bits_count(&gb);

  3869.         if (count>0)

  3870.         {

  3871.             av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",

  3872.                    count, get_bits(&gb, count));

  3873.         }

  3874.         else if (count < 0)

  3875.         {

  3876.             av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);

  3877.         }

  3878.     } else { // VC1/WVC1

  3879.         uint8_t *start = avctx->extradata, *end = avctx->extradata + avctx->extradata_size;

  3880.         uint8_t *next; int size, buf2_size;

  3881.         uint8_t *buf2 = NULL;

  3882.         int seq_inited = 0, ep_inited = 0;

  3883. 

  3884.         if(avctx->extradata_size < 16) {

  3885.             av_log(avctx, AV_LOG_ERROR, "Extradata size too small: %i\n", avctx->extradata_size);

  3886.             return -1;

  3887.         }

  3888. 

  3889.         buf2 = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3890.         if(start[0]) start++; // in WVC1 extradata first byte is its size

  3891.         next = start;

  3892.         for(; next < end; start = next){

  3893.             next = find_next_marker(start + 4, end);

  3894.             size = next - start - 4;

  3895.             if(size <= 0) continue;

  3896.             buf2_size = vc1_unescape_buffer(start + 4, size, buf2);

  3897.             init_get_bits(&gb, buf2, buf2_size * 8);

  3898.             switch(AV_RB32(start)){

  3899.             case VC1_CODE_SEQHDR:

  3900.                 if(decode_sequence_header(avctx, &gb) < 0){

  3901.                     av_free(buf2);

  3902.                     return -1;

  3903.                 }

  3904.                 seq_inited = 1;

  3905.                 break;

  3906.             case VC1_CODE_ENTRYPOINT:

  3907.                 if(decode_entry_point(avctx, &gb) < 0){

  3908.                     av_free(buf2);

  3909.                     return -1;

  3910.                 }

  3911.                 ep_inited = 1;

  3912.                 break;

  3913.             }

  3914.         }

  3915.         av_free(buf2);

  3916.         if(!seq_inited || !ep_inited){

  3917.             av_log(avctx, AV_LOG_ERROR, "Incomplete extradata\n");

  3918.             return -1;

  3919.         }

  3920.     }

  3921.     avctx->has_b_frames= !!(avctx->max_b_frames);

  3922.     s->low_delay = !avctx->has_b_frames;

  3923. 

  3924.     s->mb_width = (avctx->coded_width+15)>>4;

  3925.     s->mb_height = (avctx->coded_height+15)>>4;

  3926. 

  3927.     /* Allocate mb bitplanes */

  3928.     v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3929.     v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);

  3930.     v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);

  3931.     v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);

  3932. 

  3933.     /* allocate block type info in that way so it could be used with s->block_index[] */

  3934.     v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);

  3935.     v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;

  3936.     v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;

  3937.     v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);

  3938. 

  3939.     /* Init coded blocks info */

  3940.     if (v->profile == PROFILE_ADVANCED)

  3941.     {

  3942. //        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)

  3943. //            return -1;

  3944. //        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)

  3945. //            return -1;

  3946.     }

  3947. 

  3948.     ff_intrax8_common_init(&v->x8,s);

  3949.     return 0;

  3950. }

  3951. 

  3952. 

  3953. /** Decode a VC1/WMV3 frame

  3954.  * @todo TODO: Handle VC-1 IDUs (Transport level?)

  3955.  */

  3956. static int vc1_decode_frame(AVCodecContext *avctx,

  3957.                             void *data, int *data_size,

  3958.                             uint8_t *buf, int buf_size)

  3959. {

  3960.     VC1Context *v = avctx->priv_data;

  3961.     MpegEncContext *s = &v->s;

  3962.     AVFrame *pict = data;

  3963.     uint8_t *buf2 = NULL;

  3964. 

  3965.     /* no supplementary picture */

  3966.     if (buf_size == 0) {

  3967.         /* special case for last picture */

  3968.         if (s->low_delay==0 && s->next_picture_ptr) {

  3969.             *pict= *(AVFrame*)s->next_picture_ptr;

  3970.             s->next_picture_ptr= NULL;

  3971. 

  3972.             *data_size = sizeof(AVFrame);

  3973.         }

  3974. 

  3975.         return 0;

  3976.     }

  3977. 

  3978.     /* We need to set current_picture_ptr before reading the header,

  3979.      * otherwise we cannot store anything in there. */

  3980.     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){

  3981.         int i= ff_find_unused_picture(s, 0);

  3982.         s->current_picture_ptr= &s->picture[i];

  3983.     }

  3984. 

  3985.     //for advanced profile we may need to parse and unescape data

  3986.     if (avctx->codec_id == CODEC_ID_VC1) {

  3987.         int buf_size2 = 0;

  3988.         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  3989. 

  3990.         if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */

  3991.             uint8_t *start, *end, *next;

  3992.             int size;

  3993. 

  3994.             next = buf;

  3995.             for(start = buf, end = buf + buf_size; next < end; start = next){

  3996.                 next = find_next_marker(start + 4, end);

  3997.                 size = next - start - 4;

  3998.                 if(size <= 0) continue;

  3999.                 switch(AV_RB32(start)){

  4000.                 case VC1_CODE_FRAME:

  4001.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4002.                     break;

  4003.                 case VC1_CODE_ENTRYPOINT: /* it should be before frame data */

  4004.                     buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);

  4005.                     init_get_bits(&s->gb, buf2, buf_size2*8);

  4006.                     decode_entry_point(avctx, &s->gb);

  4007.                     break;

  4008.                 case VC1_CODE_SLICE:

  4009.                     av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");

  4010.                     av_free(buf2);

  4011.                     return -1;

  4012.                 }

  4013.             }

  4014.         }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */

  4015.             uint8_t *divider;

  4016. 

  4017.             divider = find_next_marker(buf, buf + buf_size);

  4018.             if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){

  4019.                 av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");

  4020.                 return -1;

  4021.             }

  4022. 

  4023.             buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);

  4024.             // TODO

  4025.             av_free(buf2);return -1;

  4026.         }else{

  4027.             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);

  4028.         }

  4029.         init_get_bits(&s->gb, buf2, buf_size2*8);

  4030.     } else

  4031.         init_get_bits(&s->gb, buf, buf_size*8);

  4032.     // do parse frame header

  4033.     if(v->profile < PROFILE_ADVANCED) {

  4034.         if(vc1_parse_frame_header(v, &s->gb) == -1) {

  4035.             av_free(buf2);

  4036.             return -1;

  4037.         }

  4038.     } else {

  4039.         if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {

  4040.             av_free(buf2);

  4041.             return -1;

  4042.         }

  4043.     }

  4044. 

  4045.     if(s->pict_type != I_TYPE && !v->res_rtm_flag){

  4046.         av_free(buf2);

  4047.         return -1;

  4048.     }

  4049. 

  4050.     // for hurry_up==5

  4051.     s->current_picture.pict_type= s->pict_type;

  4052.     s->current_picture.key_frame= s->pict_type == I_TYPE;

  4053. 

  4054.     /* skip B-frames if we don't have reference frames */

  4055.     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){

  4056.         av_free(buf2);

  4057.         return -1;//buf_size;

  4058.     }

  4059.     /* skip b frames if we are in a hurry */

  4060.     if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;

  4061.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  4062.        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  4063.        ||  avctx->skip_frame >= AVDISCARD_ALL) {

  4064.         av_free(buf2);

  4065.         return buf_size;

  4066.     }

  4067.     /* skip everything if we are in a hurry>=5 */

  4068.     if(avctx->hurry_up>=5) {

  4069.         av_free(buf2);

  4070.         return -1;//buf_size;

  4071.     }

  4072. 

  4073.     if(s->next_p_frame_damaged){

  4074.         if(s->pict_type==B_TYPE)

  4075.             return buf_size;

  4076.         else

  4077.             s->next_p_frame_damaged=0;

  4078.     }

  4079. 

  4080.     if(MPV_frame_start(s, avctx) < 0) {

  4081.         av_free(buf2);

  4082.         return -1;

  4083.     }

  4084. 

  4085.     s->me.qpel_put= s->dsp.put_qpel_pixels_tab;

  4086.     s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;

  4087. 

  4088.     ff_er_frame_start(s);

  4089. 

  4090.     v->bits = buf_size * 8;

  4091.     vc1_decode_blocks(v);

  4092. //av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);

  4093. //  if(get_bits_count(&s->gb) > buf_size * 8)

  4094. //      return -1;

  4095.     ff_er_frame_end(s);

  4096. 

  4097.     MPV_frame_end(s);

  4098. 

  4099. assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);

  4100. assert(s->current_picture.pict_type == s->pict_type);

  4101.     if (s->pict_type == B_TYPE || s->low_delay) {

  4102.         *pict= *(AVFrame*)s->current_picture_ptr;

  4103.     } else if (s->last_picture_ptr != NULL) {

  4104.         *pict= *(AVFrame*)s->last_picture_ptr;

  4105.     }

  4106. 

  4107.     if(s->last_picture_ptr || s->low_delay){

  4108.         *data_size = sizeof(AVFrame);

  4109.         ff_print_debug_info(s, pict);

  4110.     }

  4111. 

  4112.     /* Return the Picture timestamp as the frame number */

  4113.     /* we substract 1 because it is added on utils.c    */

  4114.     avctx->frame_number = s->picture_number - 1;

  4115. 

  4116.     av_free(buf2);

  4117.     return buf_size;

  4118. }

  4119. 

  4120. 

  4121. /** Close a VC1/WMV3 decoder

  4122.  * @warning Initial try at using MpegEncContext stuff

  4123.  */

  4124. static int vc1_decode_end(AVCodecContext *avctx)

  4125. {

  4126.     VC1Context *v = avctx->priv_data;

  4127. 

  4128.     av_freep(&v->hrd_rate);

  4129.     av_freep(&v->hrd_buffer);

  4130.     MPV_common_end(&v->s);

  4131.     av_freep(&v->mv_type_mb_plane);

  4132.     av_freep(&v->direct_mb_plane);

  4133.     av_freep(&v->acpred_plane);

  4134.     av_freep(&v->over_flags_plane);

  4135.     av_freep(&v->mb_type_base);

  4136.     return 0;

  4137. }

  4138. 

  4139. 

  4140. AVCodec vc1_decoder = {

  4141.     "vc1",

  4142.     CODEC_TYPE_VIDEO,

  4143.     CODEC_ID_VC1,

  4144.     sizeof(VC1Context),

  4145.     vc1_decode_init,

  4146.     NULL,

  4147.     vc1_decode_end,

  4148.     vc1_decode_frame,

  4149.     CODEC_CAP_DELAY,

  4150.     NULL

  4151. };

  4152. 

  4153. AVCodec wmv3_decoder = {

  4154.     "wmv3",

  4155.     CODEC_TYPE_VIDEO,

  4156.     CODEC_ID_WMV3,

  4157.     sizeof(VC1Context),

  4158.     vc1_decode_init,

  4159.     NULL,

  4160.     vc1_decode_end,

  4161.     vc1_decode_frame,

  4162.     CODEC_CAP_DELAY,

  4163.     NULL

  4164. };