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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The FFmpeg Project.

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

  23.  * SVQ3 data is transported within Apple Quicktime files. Quicktime files

  24.  * have stsd atoms to describe media trak properties. A stsd atom for a

  25.  * video trak contains 1 or more ImageDescription atoms. These atoms begin

  26.  * with the 4-byte length of the atom followed by the codec fourcc. Some

  27.  * decoders need information in this atom to operate correctly. Such

  28.  * is the case with SVQ3. In order to get the best use out of this decoder,

  29.  * the calling app must make the SVQ3 ImageDescription atom available

  30.  * via the AVCodecContext's extradata[_size] field:

  31.  *

  32.  * AVCodecContext.extradata = pointer to ImageDescription, first characters

  33.  * are expected to be 'S', 'V', 'Q', and '3', NOT the 4-byte atom length

  34.  * AVCodecContext.extradata_size = size of ImageDescription atom memory

  35.  * buffer (which will be the same as the ImageDescription atom size field

  36.  * from the QT file, minus 4 bytes since the length is missing)

  37.  *

  38.  * You will know you have these parameters passed correctly when the decoder

  39.  * correctly decodes this file:

  40.  *  ftp://ftp.mplayerhq.hu/MPlayer/samples/V-codecs/SVQ3/Vertical400kbit.sorenson3.mov

  41.  */

  42. 

  43. /**

  44.  * @file svq3.c

  45.  * svq3 decoder.

  46.  */

  47. 

  48. #define FULLPEL_MODE  1

  49. #define HALFPEL_MODE  2

  50. #define THIRDPEL_MODE 3

  51. #define PREDICT_MODE  4

  52. 

  53. /* dual scan (from some older h264 draft)

  54.  o-->o-->o   o

  55.          |  /|

  56.  o   o   o / o

  57.  | / |   |/  |

  58.  o   o   o   o

  59.    /

  60.  o-->o-->o-->o

  61. */

  62. static const uint8_t svq3_scan[16]={

  63.  0+0*4, 1+0*4, 2+0*4, 2+1*4,

  64.  2+2*4, 3+0*4, 3+1*4, 3+2*4,

  65.  0+1*4, 0+2*4, 1+1*4, 1+2*4,

  66.  0+3*4, 1+3*4, 2+3*4, 3+3*4,

  67. };

  68. 

  69. static const uint8_t svq3_pred_0[25][2] = {

  70.   { 0, 0 },

  71.   { 1, 0 }, { 0, 1 },

  72.   { 0, 2 }, { 1, 1 }, { 2, 0 },

  73.   { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  74.   { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  75.   { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  76.   { 2, 4 }, { 3, 3 }, { 4, 2 },

  77.   { 4, 3 }, { 3, 4 },

  78.   { 4, 4 }

  79. };

  80. 

  81. static const int8_t svq3_pred_1[6][6][5] = {

  82.   { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  83.     { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

  84.   { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 4, 3 }, { 0, 1, 2, 4, 3 },

  85.     { 0, 2, 1, 4, 3 }, { 2, 0, 1, 3, 4 }, { 0, 4, 2, 1, 3 } },

  86.   { { 2, 0,-1,-1,-1 }, { 2, 1, 0, 4, 3 }, { 1, 2, 4, 0, 3 },

  87.     { 2, 1, 0, 4, 3 }, { 2, 1, 4, 3, 0 }, { 1, 2, 4, 0, 3 } },

  88.   { { 2, 0,-1,-1,-1 }, { 2, 0, 1, 4, 3 }, { 1, 2, 0, 4, 3 },

  89.     { 2, 1, 0, 4, 3 }, { 2, 1, 3, 4, 0 }, { 2, 4, 1, 0, 3 } },

  90.   { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 3, 4 }, { 1, 2, 3, 0, 4 },

  91.     { 2, 0, 1, 3, 4 }, { 2, 1, 3, 0, 4 }, { 2, 0, 4, 3, 1 } },

  92.   { { 0, 2,-1,-1,-1 }, { 0, 2, 4, 1, 3 }, { 1, 4, 2, 0, 3 },

  93.     { 4, 2, 0, 1, 3 }, { 2, 0, 1, 4, 3 }, { 4, 2, 1, 0, 3 } },

  94. };

  95. 

  96. static const struct { uint8_t run; uint8_t level; } svq3_dct_tables[2][16] = {

  97.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  98.     { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  99.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  100.     { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  101. };

  102. 

  103. static const uint32_t svq3_dequant_coeff[32] = {

  104.    3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  105.    9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  106.   24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  107.   61694, 68745, 77615, 89113,100253,109366,126635,141533

  108. };

  109. 

  110. 

  111. static void svq3_luma_dc_dequant_idct_c(DCTELEM *block, int qp){

  112.     const int qmul= svq3_dequant_coeff[qp];

  113. #define stride 16

  114.     int i;

  115.     int temp[16];

  116.     static const int x_offset[4]={0, 1*stride, 4* stride,  5*stride};

  117.     static const int y_offset[4]={0, 2*stride, 8* stride, 10*stride};

  118. 

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

  120.         const int offset= y_offset[i];

  121.         const int z0= 13*(block[offset+stride*0] +    block[offset+stride*4]);

  122.         const int z1= 13*(block[offset+stride*0] -    block[offset+stride*4]);

  123.         const int z2=  7* block[offset+stride*1] - 17*block[offset+stride*5];

  124.         const int z3= 17* block[offset+stride*1] +  7*block[offset+stride*5];

  125. 

  126.         temp[4*i+0]= z0+z3;

  127.         temp[4*i+1]= z1+z2;

  128.         temp[4*i+2]= z1-z2;

  129.         temp[4*i+3]= z0-z3;

  130.     }

  131. 

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

  133.         const int offset= x_offset[i];

  134.         const int z0= 13*(temp[4*0+i] +    temp[4*2+i]);

  135.         const int z1= 13*(temp[4*0+i] -    temp[4*2+i]);

  136.         const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];

  137.         const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];

  138. 

  139.         block[stride*0 +offset]= ((z0 + z3)*qmul + 0x80000)>>20;

  140.         block[stride*2 +offset]= ((z1 + z2)*qmul + 0x80000)>>20;

  141.         block[stride*8 +offset]= ((z1 - z2)*qmul + 0x80000)>>20;

  142.         block[stride*10+offset]= ((z0 - z3)*qmul + 0x80000)>>20;

  143.     }

  144. }

  145. #undef stride

  146. 

  147. static void svq3_add_idct_c (uint8_t *dst, DCTELEM *block, int stride, int qp, int dc){

  148.     const int qmul= svq3_dequant_coeff[qp];

  149.     int i;

  150.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  151. 

  152.     if (dc) {

  153.         dc = 13*13*((dc == 1) ? 1538*block[0] : ((qmul*(block[0] >> 3)) / 2));

  154.         block[0] = 0;

  155.     }

  156. 

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

  158.         const int z0= 13*(block[0 + 4*i] +    block[2 + 4*i]);

  159.         const int z1= 13*(block[0 + 4*i] -    block[2 + 4*i]);

  160.         const int z2=  7* block[1 + 4*i] - 17*block[3 + 4*i];

  161.         const int z3= 17* block[1 + 4*i] +  7*block[3 + 4*i];

  162. 

  163.         block[0 + 4*i]= z0 + z3;

  164.         block[1 + 4*i]= z1 + z2;

  165.         block[2 + 4*i]= z1 - z2;

  166.         block[3 + 4*i]= z0 - z3;

  167.     }

  168. 

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

  170.         const int z0= 13*(block[i + 4*0] +    block[i + 4*2]);

  171.         const int z1= 13*(block[i + 4*0] -    block[i + 4*2]);

  172.         const int z2=  7* block[i + 4*1] - 17*block[i + 4*3];

  173.         const int z3= 17* block[i + 4*1] +  7*block[i + 4*3];

  174.         const int rr= (dc + 0x80000);

  175. 

  176.         dst[i + stride*0]= cm[ dst[i + stride*0] + (((z0 + z3)*qmul + rr) >> 20) ];

  177.         dst[i + stride*1]= cm[ dst[i + stride*1] + (((z1 + z2)*qmul + rr) >> 20) ];

  178.         dst[i + stride*2]= cm[ dst[i + stride*2] + (((z1 - z2)*qmul + rr) >> 20) ];

  179.         dst[i + stride*3]= cm[ dst[i + stride*3] + (((z0 - z3)*qmul + rr) >> 20) ];

  180.     }

  181. }

  182. 

  183. static inline int svq3_decode_block (GetBitContext *gb, DCTELEM *block,

  184.                                      int index, const int type) {

  185. 

  186.   static const uint8_t *const scan_patterns[4] =

  187.   { luma_dc_zigzag_scan, zigzag_scan, svq3_scan, chroma_dc_scan };

  188. 

  189.   int run, level, sign, vlc, limit;

  190.   const int intra = (3 * type) >> 2;

  191.   const uint8_t *const scan = scan_patterns[type];

  192. 

  193.   for (limit=(16 >> intra); index < 16; index=limit, limit+=8) {

  194.     for (; (vlc = svq3_get_ue_golomb (gb)) != 0; index++) {

  195. 

  196.       if (vlc == INVALID_VLC)

  197.         return -1;

  198. 

  199.       sign = (vlc & 0x1) - 1;

  200.       vlc  = (vlc + 1) >> 1;

  201. 

  202.       if (type == 3) {

  203.         if (vlc < 3) {

  204.           run   = 0;

  205.           level = vlc;

  206.         } else if (vlc < 4) {

  207.           run   = 1;

  208.           level = 1;

  209.         } else {

  210.           run   = (vlc & 0x3);

  211.           level = ((vlc + 9) >> 2) - run;

  212.         }

  213.       } else {

  214.         if (vlc < 16) {

  215.           run   = svq3_dct_tables[intra][vlc].run;

  216.           level = svq3_dct_tables[intra][vlc].level;

  217.         } else if (intra) {

  218.           run   = (vlc & 0x7);

  219.           level = (vlc >> 3) + ((run == 0) ? 8 : ((run < 2) ? 2 : ((run < 5) ? 0 : -1)));

  220.         } else {

  221.           run   = (vlc & 0xF);

  222.           level = (vlc >> 4) + ((run == 0) ? 4 : ((run < 3) ? 2 : ((run < 10) ? 1 : 0)));

  223.         }

  224.       }

  225. 

  226.       if ((index += run) >= limit)

  227.         return -1;

  228. 

  229.       block[scan[index]] = (level ^ sign) - sign;

  230.     }

  231. 

  232.     if (type != 2) {

  233.       break;

  234.     }

  235.   }

  236. 

  237.   return 0;

  238. }

  239. 

  240. static inline void svq3_mc_dir_part (MpegEncContext *s,

  241.                                      int x, int y, int width, int height,

  242.                                      int mx, int my, int dxy,

  243.                                      int thirdpel, int dir, int avg) {

  244. 

  245.   const Picture *pic = (dir == 0) ? &s->last_picture : &s->next_picture;

  246.   uint8_t *src, *dest;

  247.   int i, emu = 0;

  248.   int blocksize= 2 - (width>>3); //16->0, 8->1, 4->2

  249. 

  250.   mx += x;

  251.   my += y;

  252. 

  253.   if (mx < 0 || mx >= (s->h_edge_pos - width  - 1) ||

  254.       my < 0 || my >= (s->v_edge_pos - height - 1)) {

  255. 

  256.     if ((s->flags & CODEC_FLAG_EMU_EDGE)) {

  257.       emu = 1;

  258.     }

  259. 

  260.     mx = av_clip (mx, -16, (s->h_edge_pos - width  + 15));

  261.     my = av_clip (my, -16, (s->v_edge_pos - height + 15));

  262.   }

  263. 

  264.   /* form component predictions */

  265.   dest = s->current_picture.data[0] + x + y*s->linesize;

  266.   src  = pic->data[0] + mx + my*s->linesize;

  267. 

  268.   if (emu) {

  269.     ff_emulated_edge_mc (s->edge_emu_buffer, src, s->linesize, (width + 1), (height + 1),

  270.                          mx, my, s->h_edge_pos, s->v_edge_pos);

  271.     src = s->edge_emu_buffer;

  272.   }

  273.   if(thirdpel)

  274.     (avg ? s->dsp.avg_tpel_pixels_tab : s->dsp.put_tpel_pixels_tab)[dxy](dest, src, s->linesize, width, height);

  275.   else

  276.     (avg ? s->dsp.avg_pixels_tab : s->dsp.put_pixels_tab)[blocksize][dxy](dest, src, s->linesize, height);

  277. 

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

  279.     mx     = (mx + (mx < (int) x)) >> 1;

  280.     my     = (my + (my < (int) y)) >> 1;

  281.     width  = (width  >> 1);

  282.     height = (height >> 1);

  283.     blocksize++;

  284. 

  285.     for (i=1; i < 3; i++) {

  286.       dest = s->current_picture.data[i] + (x >> 1) + (y >> 1)*s->uvlinesize;

  287.       src  = pic->data[i] + mx + my*s->uvlinesize;

  288. 

  289.       if (emu) {

  290.         ff_emulated_edge_mc (s->edge_emu_buffer, src, s->uvlinesize, (width + 1), (height + 1),

  291.                              mx, my, (s->h_edge_pos >> 1), (s->v_edge_pos >> 1));

  292.         src = s->edge_emu_buffer;

  293.       }

  294.       if(thirdpel)

  295.         (avg ? s->dsp.avg_tpel_pixels_tab : s->dsp.put_tpel_pixels_tab)[dxy](dest, src, s->uvlinesize, width, height);

  296.       else

  297.         (avg ? s->dsp.avg_pixels_tab : s->dsp.put_pixels_tab)[blocksize][dxy](dest, src, s->uvlinesize, height);

  298.     }

  299.   }

  300. }

  301. 

  302. static inline int svq3_mc_dir (H264Context *h, int size, int mode, int dir, int avg) {

  303. 

  304.   int i, j, k, mx, my, dx, dy, x, y;

  305.   MpegEncContext *const s = (MpegEncContext *) h;

  306.   const int part_width  = ((size & 5) == 4) ? 4 : 16 >> (size & 1);

  307.   const int part_height = 16 >> ((unsigned) (size + 1) / 3);

  308.   const int extra_width = (mode == PREDICT_MODE) ? -16*6 : 0;

  309.   const int h_edge_pos  = 6*(s->h_edge_pos - part_width ) - extra_width;

  310.   const int v_edge_pos  = 6*(s->v_edge_pos - part_height) - extra_width;

  311. 

  312.   for (i=0; i < 16; i+=part_height) {

  313.     for (j=0; j < 16; j+=part_width) {

  314.       const int b_xy = (4*s->mb_x+(j>>2)) + (4*s->mb_y+(i>>2))*h->b_stride;

  315.       int dxy;

  316.       x = 16*s->mb_x + j;

  317.       y = 16*s->mb_y + i;

  318.       k = ((j>>2)&1) + ((i>>1)&2) + ((j>>1)&4) + (i&8);

  319. 

  320.       if (mode != PREDICT_MODE) {

  321.         pred_motion (h, k, (part_width >> 2), dir, 1, &mx, &my);

  322.       } else {

  323.         mx = s->next_picture.motion_val[0][b_xy][0]<<1;

  324.         my = s->next_picture.motion_val[0][b_xy][1]<<1;

  325. 

  326.         if (dir == 0) {

  327.           mx = ((mx * h->frame_num_offset) / h->prev_frame_num_offset + 1)>>1;

  328.           my = ((my * h->frame_num_offset) / h->prev_frame_num_offset + 1)>>1;

  329.         } else {

  330.           mx = ((mx * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset + 1)>>1;

  331.           my = ((my * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset + 1)>>1;

  332.         }

  333.       }

  334. 

  335.       /* clip motion vector prediction to frame border */

  336.       mx = av_clip (mx, extra_width - 6*x, h_edge_pos - 6*x);

  337.       my = av_clip (my, extra_width - 6*y, v_edge_pos - 6*y);

  338. 

  339.       /* get (optional) motion vector differential */

  340.       if (mode == PREDICT_MODE) {

  341.         dx = dy = 0;

  342.       } else {

  343.         dy = svq3_get_se_golomb (&s->gb);

  344.         dx = svq3_get_se_golomb (&s->gb);

  345. 

  346.         if (dx == INVALID_VLC || dy == INVALID_VLC) {

  347.           av_log(h->s.avctx, AV_LOG_ERROR, "invalid MV vlc\n");

  348.           return -1;

  349.         }

  350.       }

  351. 

  352.       /* compute motion vector */

  353.       if (mode == THIRDPEL_MODE) {

  354.         int fx, fy;

  355.         mx = ((mx + 1)>>1) + dx;

  356.         my = ((my + 1)>>1) + dy;

  357.         fx= ((unsigned)(mx + 0x3000))/3 - 0x1000;

  358.         fy= ((unsigned)(my + 0x3000))/3 - 0x1000;

  359.         dxy= (mx - 3*fx) + 4*(my - 3*fy);

  360. 

  361.         svq3_mc_dir_part (s, x, y, part_width, part_height, fx, fy, dxy, 1, dir, avg);

  362.         mx += mx;

  363.         my += my;

  364.       } else if (mode == HALFPEL_MODE || mode == PREDICT_MODE) {

  365.         mx = ((unsigned)(mx + 1 + 0x3000))/3 + dx - 0x1000;

  366.         my = ((unsigned)(my + 1 + 0x3000))/3 + dy - 0x1000;

  367.         dxy= (mx&1) + 2*(my&1);

  368. 

  369.         svq3_mc_dir_part (s, x, y, part_width, part_height, mx>>1, my>>1, dxy, 0, dir, avg);

  370.         mx *= 3;

  371.         my *= 3;

  372.       } else {

  373.         mx = ((unsigned)(mx + 3 + 0x6000))/6 + dx - 0x1000;

  374.         my = ((unsigned)(my + 3 + 0x6000))/6 + dy - 0x1000;

  375. 

  376.         svq3_mc_dir_part (s, x, y, part_width, part_height, mx, my, 0, 0, dir, avg);

  377.         mx *= 6;

  378.         my *= 6;

  379.       }

  380. 

  381.       /* update mv_cache */

  382.       if (mode != PREDICT_MODE) {

  383.         int32_t mv = pack16to32(mx,my);

  384. 

  385.         if (part_height == 8 && i < 8) {

  386.           *(int32_t *) h->mv_cache[dir][scan8[k] + 1*8] = mv;

  387. 

  388.           if (part_width == 8 && j < 8) {

  389.             *(int32_t *) h->mv_cache[dir][scan8[k] + 1 + 1*8] = mv;

  390.           }

  391.         }

  392.         if (part_width == 8 && j < 8) {

  393.           *(int32_t *) h->mv_cache[dir][scan8[k] + 1] = mv;

  394.         }

  395.         if (part_width == 4 || part_height == 4) {

  396.           *(int32_t *) h->mv_cache[dir][scan8[k]] = mv;

  397.         }

  398.       }

  399. 

  400.       /* write back motion vectors */

  401.       fill_rectangle(s->current_picture.motion_val[dir][b_xy], part_width>>2, part_height>>2, h->b_stride, pack16to32(mx,my), 4);

  402.     }

  403.   }

  404. 

  405.   return 0;

  406. }

  407. 

  408. static int svq3_decode_mb (H264Context *h, unsigned int mb_type) {

  409.   int i, j, k, m, dir, mode;

  410.   int cbp = 0;

  411.   uint32_t vlc;

  412.   int8_t *top, *left;

  413.   MpegEncContext *const s = (MpegEncContext *) h;

  414.   const int mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  415.   const int b_xy = 4*s->mb_x + 4*s->mb_y*h->b_stride;

  416. 

  417.   h->top_samples_available        = (s->mb_y == 0) ? 0x33FF : 0xFFFF;

  418.   h->left_samples_available        = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;

  419.   h->topright_samples_available        = 0xFFFF;

  420. 

  421.   if (mb_type == 0) {           /* SKIP */

  422.     if (s->pict_type == P_TYPE || s->next_picture.mb_type[mb_xy] == -1) {

  423.       svq3_mc_dir_part (s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0, 0, 0, 0);

  424. 

  425.       if (s->pict_type == B_TYPE) {

  426.         svq3_mc_dir_part (s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0, 0, 1, 1);

  427.       }

  428. 

  429.       mb_type = MB_TYPE_SKIP;

  430.     } else {

  431.       mb_type= FFMIN(s->next_picture.mb_type[mb_xy], 6);

  432.       if(svq3_mc_dir (h, mb_type, PREDICT_MODE, 0, 0) < 0)

  433.         return -1;

  434.       if(svq3_mc_dir (h, mb_type, PREDICT_MODE, 1, 1) < 0)

  435.         return -1;

  436. 

  437.       mb_type = MB_TYPE_16x16;

  438.     }

  439.   } else if (mb_type < 8) {     /* INTER */

  440.     if (h->thirdpel_flag && h->halfpel_flag == !get_bits1 (&s->gb)) {

  441.       mode = THIRDPEL_MODE;

  442.     } else if (h->halfpel_flag && h->thirdpel_flag == !get_bits1 (&s->gb)) {

  443.       mode = HALFPEL_MODE;

  444.     } else {

  445.       mode = FULLPEL_MODE;

  446.     }

  447. 

  448.     /* fill caches */

  449.     /* note ref_cache should contain here:

  450.         ????????

  451.         ???11111

  452.         N??11111

  453.         N??11111

  454.         N??11111

  455.     */

  456. 

  457.     for (m=0; m < 2; m++) {

  458.       if (s->mb_x > 0 && h->intra4x4_pred_mode[mb_xy - 1][0] != -1) {

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

  460.           *(uint32_t *) h->mv_cache[m][scan8[0] - 1 + i*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - 1 + i*h->b_stride];

  461.         }

  462.       } else {

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

  464.           *(uint32_t *) h->mv_cache[m][scan8[0] - 1 + i*8] = 0;

  465.         }

  466.       }

  467.       if (s->mb_y > 0) {

  468.         memcpy (h->mv_cache[m][scan8[0] - 1*8], s->current_picture.motion_val[m][b_xy - h->b_stride], 4*2*sizeof(int16_t));

  469.         memset (&h->ref_cache[m][scan8[0] - 1*8], (h->intra4x4_pred_mode[mb_xy - s->mb_stride][4] == -1) ? PART_NOT_AVAILABLE : 1, 4);

  470. 

  471.         if (s->mb_x < (s->mb_width - 1)) {

  472.           *(uint32_t *) h->mv_cache[m][scan8[0] + 4 - 1*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - h->b_stride + 4];

  473.           h->ref_cache[m][scan8[0] + 4 - 1*8] =

  474.                   (h->intra4x4_pred_mode[mb_xy - s->mb_stride + 1][0] == -1 ||

  475.                    h->intra4x4_pred_mode[mb_xy - s->mb_stride][4] == -1) ? PART_NOT_AVAILABLE : 1;

  476.         }else

  477.           h->ref_cache[m][scan8[0] + 4 - 1*8] = PART_NOT_AVAILABLE;

  478.         if (s->mb_x > 0) {

  479.           *(uint32_t *) h->mv_cache[m][scan8[0] - 1 - 1*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - h->b_stride - 1];

  480.           h->ref_cache[m][scan8[0] - 1 - 1*8] = (h->intra4x4_pred_mode[mb_xy - s->mb_stride - 1][3] == -1) ? PART_NOT_AVAILABLE : 1;

  481.         }else

  482.           h->ref_cache[m][scan8[0] - 1 - 1*8] = PART_NOT_AVAILABLE;

  483.       }else

  484.         memset (&h->ref_cache[m][scan8[0] - 1*8 - 1], PART_NOT_AVAILABLE, 8);

  485. 

  486.       if (s->pict_type != B_TYPE)

  487.         break;

  488.     }

  489. 

  490.     /* decode motion vector(s) and form prediction(s) */

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

  492.       if(svq3_mc_dir (h, (mb_type - 1), mode, 0, 0) < 0)

  493.         return -1;

  494.     } else {        /* B_TYPE */

  495.       if (mb_type != 2) {

  496.         if(svq3_mc_dir (h, 0, mode, 0, 0) < 0)

  497.           return -1;

  498.       } else {

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

  500.           memset (s->current_picture.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  501.         }

  502.       }

  503.       if (mb_type != 1) {

  504.         if(svq3_mc_dir (h, 0, mode, 1, (mb_type == 3)) < 0)

  505.           return -1;

  506.       } else {

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

  508.           memset (s->current_picture.motion_val[1][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  509.         }

  510.       }

  511.     }

  512. 

  513.     mb_type = MB_TYPE_16x16;

  514.   } else if (mb_type == 8 || mb_type == 33) {   /* INTRA4x4 */

  515.     memset (h->intra4x4_pred_mode_cache, -1, 8*5*sizeof(int8_t));

  516. 

  517.     if (mb_type == 8) {

  518.       if (s->mb_x > 0) {

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

  520.           h->intra4x4_pred_mode_cache[scan8[0] - 1 + i*8] = h->intra4x4_pred_mode[mb_xy - 1][i];

  521.         }

  522.         if (h->intra4x4_pred_mode_cache[scan8[0] - 1] == -1) {

  523.           h->left_samples_available = 0x5F5F;

  524.         }

  525.       }

  526.       if (s->mb_y > 0) {

  527.         h->intra4x4_pred_mode_cache[4+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][4];

  528.         h->intra4x4_pred_mode_cache[5+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][5];

  529.         h->intra4x4_pred_mode_cache[6+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][6];

  530.         h->intra4x4_pred_mode_cache[7+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][3];

  531. 

  532.         if (h->intra4x4_pred_mode_cache[4+8*0] == -1) {

  533.           h->top_samples_available = 0x33FF;

  534.         }

  535.       }

  536. 

  537.       /* decode prediction codes for luma blocks */

  538.       for (i=0; i < 16; i+=2) {

  539.         vlc = svq3_get_ue_golomb (&s->gb);

  540. 

  541.         if (vlc >= 25){

  542.           av_log(h->s.avctx, AV_LOG_ERROR, "luma prediction:%d\n", vlc);

  543.           return -1;

  544.         }

  545. 

  546.         left    = &h->intra4x4_pred_mode_cache[scan8[i] - 1];

  547.         top     = &h->intra4x4_pred_mode_cache[scan8[i] - 8];

  548. 

  549.         left[1] = svq3_pred_1[top[0] + 1][left[0] + 1][svq3_pred_0[vlc][0]];

  550.         left[2] = svq3_pred_1[top[1] + 1][left[1] + 1][svq3_pred_0[vlc][1]];

  551. 

  552.         if (left[1] == -1 || left[2] == -1){

  553.           av_log(h->s.avctx, AV_LOG_ERROR, "weird prediction\n");

  554.           return -1;

  555.         }

  556.       }

  557.     } else {    /* mb_type == 33, DC_128_PRED block type */

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

  559.         memset (&h->intra4x4_pred_mode_cache[scan8[0] + 8*i], DC_PRED, 4);

  560.       }

  561.     }

  562. 

  563.     write_back_intra_pred_mode (h);

  564. 

  565.     if (mb_type == 8) {

  566.       check_intra4x4_pred_mode (h);

  567. 

  568.       h->top_samples_available  = (s->mb_y == 0) ? 0x33FF : 0xFFFF;

  569.       h->left_samples_available = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;

  570.     } else {

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

  572.         memset (&h->intra4x4_pred_mode_cache[scan8[0] + 8*i], DC_128_PRED, 4);

  573.       }

  574. 

  575.       h->top_samples_available  = 0x33FF;

  576.       h->left_samples_available = 0x5F5F;

  577.     }

  578. 

  579.     mb_type = MB_TYPE_INTRA4x4;

  580.   } else {                      /* INTRA16x16 */

  581.     dir = i_mb_type_info[mb_type - 8].pred_mode;

  582.     dir = (dir >> 1) ^ 3*(dir & 1) ^ 1;

  583. 

  584.     if ((h->intra16x16_pred_mode = check_intra_pred_mode (h, dir)) == -1){

  585.       av_log(h->s.avctx, AV_LOG_ERROR, "check_intra_pred_mode = -1\n");

  586.       return -1;

  587.     }

  588. 

  589.     cbp = i_mb_type_info[mb_type - 8].cbp;

  590.     mb_type = MB_TYPE_INTRA16x16;

  591.   }

  592. 

  593.   if (!IS_INTER(mb_type) && s->pict_type != I_TYPE) {

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

  595.       memset (s->current_picture.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  596.     }

  597.     if (s->pict_type == B_TYPE) {

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

  599.         memset (s->current_picture.motion_val[1][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  600.       }

  601.     }

  602.   }

  603.   if (!IS_INTRA4x4(mb_type)) {

  604.     memset (h->intra4x4_pred_mode[mb_xy], DC_PRED, 8);

  605.   }

  606.   if (!IS_SKIP(mb_type) || s->pict_type == B_TYPE) {

  607.     memset (h->non_zero_count_cache + 8, 0, 4*9*sizeof(uint8_t));

  608.     s->dsp.clear_blocks(h->mb);

  609.   }

  610. 

  611.   if (!IS_INTRA16x16(mb_type) && (!IS_SKIP(mb_type) || s->pict_type == B_TYPE)) {

  612.     if ((vlc = svq3_get_ue_golomb (&s->gb)) >= 48){

  613.       av_log(h->s.avctx, AV_LOG_ERROR, "cbp_vlc=%d\n", vlc);

  614.       return -1;

  615.     }

  616. 

  617.     cbp = IS_INTRA(mb_type) ? golomb_to_intra4x4_cbp[vlc] : golomb_to_inter_cbp[vlc];

  618.   }

  619.   if (IS_INTRA16x16(mb_type) || (s->pict_type != I_TYPE && s->adaptive_quant && cbp)) {

  620.     s->qscale += svq3_get_se_golomb (&s->gb);

  621. 

  622.     if (s->qscale > 31){

  623.       av_log(h->s.avctx, AV_LOG_ERROR, "qscale:%d\n", s->qscale);

  624.       return -1;

  625.     }

  626.   }

  627.   if (IS_INTRA16x16(mb_type)) {

  628.     if (svq3_decode_block (&s->gb, h->mb, 0, 0)){

  629.       av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding intra luma dc\n");

  630.       return -1;

  631.     }

  632.   }

  633. 

  634.   if (cbp) {

  635.     const int index = IS_INTRA16x16(mb_type) ? 1 : 0;

  636.     const int type = ((s->qscale < 24 && IS_INTRA4x4(mb_type)) ? 2 : 1);

  637. 

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

  639.       if ((cbp & (1 << i))) {

  640.         for (j=0; j < 4; j++) {

  641.           k = index ? ((j&1) + 2*(i&1) + 2*(j&2) + 4*(i&2)) : (4*i + j);

  642.           h->non_zero_count_cache[ scan8[k] ] = 1;

  643. 

  644.           if (svq3_decode_block (&s->gb, &h->mb[16*k], index, type)){

  645.             av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding block\n");

  646.             return -1;

  647.           }

  648.         }

  649.       }

  650.     }

  651. 

  652.     if ((cbp & 0x30)) {

  653.       for (i=0; i < 2; ++i) {

  654.         if (svq3_decode_block (&s->gb, &h->mb[16*(16 + 4*i)], 0, 3)){

  655.           av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding chroma dc block\n");

  656.           return -1;

  657.         }

  658.       }

  659. 

  660.       if ((cbp & 0x20)) {

  661.         for (i=0; i < 8; i++) {

  662.           h->non_zero_count_cache[ scan8[16+i] ] = 1;

  663. 

  664.           if (svq3_decode_block (&s->gb, &h->mb[16*(16 + i)], 1, 1)){

  665.             av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding chroma ac block\n");

  666.             return -1;

  667.           }

  668.         }

  669.       }

  670.     }

  671.   }

  672. 

  673.   s->current_picture.mb_type[mb_xy] = mb_type;

  674. 

  675.   if (IS_INTRA(mb_type)) {

  676.     h->chroma_pred_mode = check_intra_pred_mode (h, DC_PRED8x8);

  677.   }

  678. 

  679.   return 0;

  680. }

  681. 

  682. static int svq3_decode_slice_header (H264Context *h) {

  683.   MpegEncContext *const s = (MpegEncContext *) h;

  684.   const int mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  685.   int i, header;

  686. 

  687.   header = get_bits (&s->gb, 8);

  688. 

  689.   if (((header & 0x9F) != 1 && (header & 0x9F) != 2) || (header & 0x60) == 0) {

  690.     /* TODO: what? */

  691.     av_log(h->s.avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);

  692.     return -1;

  693.   } else {

  694.     int length = (header >> 5) & 3;

  695. 

  696.     h->next_slice_index = get_bits_count(&s->gb) + 8*show_bits (&s->gb, 8*length) + 8*length;

  697. 

  698.     if (h->next_slice_index > s->gb.size_in_bits){

  699.       av_log(h->s.avctx, AV_LOG_ERROR, "slice after bitstream end\n");

  700.       return -1;

  701.     }

  702. 

  703.     s->gb.size_in_bits = h->next_slice_index - 8*(length - 1);

  704.     skip_bits(&s->gb, 8);

  705. 

  706.     if (length > 0) {

  707.       memcpy ((uint8_t *) &s->gb.buffer[get_bits_count(&s->gb) >> 3],

  708.              &s->gb.buffer[s->gb.size_in_bits >> 3], (length - 1));

  709.     }

  710.   }

  711. 

  712.   if ((i = svq3_get_ue_golomb (&s->gb)) == INVALID_VLC || i >= 3){

  713.     av_log(h->s.avctx, AV_LOG_ERROR, "illegal slice type %d \n", i);

  714.     return -1;

  715.   }

  716. 

  717.   h->slice_type = golomb_to_pict_type[i];

  718. 

  719.   if ((header & 0x9F) == 2) {

  720.     i = (s->mb_num < 64) ? 6 : (1 + av_log2 (s->mb_num - 1));

  721.     s->mb_skip_run = get_bits (&s->gb, i) - (s->mb_x + (s->mb_y * s->mb_width));

  722.   } else {

  723.     skip_bits1 (&s->gb);

  724.     s->mb_skip_run = 0;

  725.   }

  726. 

  727.   h->slice_num = get_bits (&s->gb, 8);

  728.   s->qscale = get_bits (&s->gb, 5);

  729.   s->adaptive_quant = get_bits1 (&s->gb);

  730. 

  731.   /* unknown fields */

  732.   skip_bits1 (&s->gb);

  733. 

  734.   if (h->unknown_svq3_flag) {

  735.     skip_bits1 (&s->gb);

  736.   }

  737. 

  738.   skip_bits1 (&s->gb);

  739.   skip_bits (&s->gb, 2);

  740. 

  741.   while (get_bits1 (&s->gb)) {

  742.     skip_bits (&s->gb, 8);

  743.   }

  744. 

  745.   /* reset intra predictors and invalidate motion vector references */

  746.   if (s->mb_x > 0) {

  747.     memset (h->intra4x4_pred_mode[mb_xy - 1], -1, 4*sizeof(int8_t));

  748.     memset (h->intra4x4_pred_mode[mb_xy - s->mb_x], -1, 8*sizeof(int8_t)*s->mb_x);

  749.   }

  750.   if (s->mb_y > 0) {

  751.     memset (h->intra4x4_pred_mode[mb_xy - s->mb_stride], -1, 8*sizeof(int8_t)*(s->mb_width - s->mb_x));

  752. 

  753.     if (s->mb_x > 0) {

  754.       h->intra4x4_pred_mode[mb_xy - s->mb_stride - 1][3] = -1;

  755.     }

  756.   }

  757. 

  758.   return 0;

  759. }

  760. 

  761. static int svq3_decode_frame (AVCodecContext *avctx,

  762.                               void *data, int *data_size,

  763.                               const uint8_t *buf, int buf_size) {

  764.   MpegEncContext *const s = avctx->priv_data;

  765.   H264Context *const h = avctx->priv_data;

  766.   int m, mb_type;

  767.   unsigned char *extradata;

  768.   unsigned int size;

  769. 

  770.   s->flags = avctx->flags;

  771.   s->flags2 = avctx->flags2;

  772.   s->unrestricted_mv = 1;

  773. 

  774.   if (!s->context_initialized) {

  775.     s->width = avctx->width;

  776.     s->height = avctx->height;

  777.     h->halfpel_flag = 1;

  778.     h->thirdpel_flag = 1;

  779.     h->unknown_svq3_flag = 0;

  780.     h->chroma_qp[0] = h->chroma_qp[1] = 4;

  781. 

  782.     if (MPV_common_init (s) < 0)

  783.       return -1;

  784. 

  785.     h->b_stride = 4*s->mb_width;

  786. 

  787.     alloc_tables (h);

  788. 

  789.     /* prowl for the "SEQH" marker in the extradata */

  790.     extradata = (unsigned char *)avctx->extradata;

  791.     for (m = 0; m < avctx->extradata_size; m++) {

  792.       if (!memcmp (extradata, "SEQH", 4))

  793.         break;

  794.       extradata++;

  795.     }

  796. 

  797.     /* if a match was found, parse the extra data */

  798.     if (extradata && !memcmp (extradata, "SEQH", 4)) {

  799. 

  800.       GetBitContext gb;

  801. 

  802.       size = AV_RB32(&extradata[4]);

  803.       init_get_bits (&gb, extradata + 8, size*8);

  804. 

  805.       /* 'frame size code' and optional 'width, height' */

  806.       if (get_bits (&gb, 3) == 7) {

  807.         skip_bits (&gb, 12);

  808.         skip_bits (&gb, 12);

  809.       }

  810. 

  811.       h->halfpel_flag = get_bits1 (&gb);

  812.       h->thirdpel_flag = get_bits1 (&gb);

  813. 

  814.       /* unknown fields */

  815.       skip_bits1 (&gb);

  816.       skip_bits1 (&gb);

  817.       skip_bits1 (&gb);

  818.       skip_bits1 (&gb);

  819. 

  820.       s->low_delay = get_bits1 (&gb);

  821. 

  822.       /* unknown field */

  823.       skip_bits1 (&gb);

  824. 

  825.       while (get_bits1 (&gb)) {

  826.         skip_bits (&gb, 8);

  827.       }

  828. 

  829.       h->unknown_svq3_flag = get_bits1 (&gb);

  830.       avctx->has_b_frames = !s->low_delay;

  831.     }

  832.   }

  833. 

  834.   /* special case for last picture */

  835.   if (buf_size == 0) {

  836.     if (s->next_picture_ptr && !s->low_delay) {

  837.       *(AVFrame *) data = *(AVFrame *) &s->next_picture;

  838.       *data_size = sizeof(AVFrame);

  839.     }

  840.     return 0;

  841.   }

  842. 

  843.   init_get_bits (&s->gb, buf, 8*buf_size);

  844. 

  845.   s->mb_x = s->mb_y = 0;

  846. 

  847.   if (svq3_decode_slice_header (h))

  848.     return -1;

  849. 

  850.   s->pict_type = h->slice_type;

  851.   s->picture_number = h->slice_num;

  852. 

  853.   if(avctx->debug&FF_DEBUG_PICT_INFO){

  854.       av_log(h->s.avctx, AV_LOG_DEBUG, "%c hpel:%d, tpel:%d aqp:%d qp:%d\n",

  855.       av_get_pict_type_char(s->pict_type), h->halfpel_flag, h->thirdpel_flag,

  856.       s->adaptive_quant, s->qscale

  857.       );

  858.   }

  859. 

  860.   /* for hurry_up==5 */

  861.   s->current_picture.pict_type = s->pict_type;

  862.   s->current_picture.key_frame = (s->pict_type == I_TYPE);

  863. 

  864.   /* Skip B-frames if we do not have reference frames. */

  865.   if (s->last_picture_ptr == NULL && s->pict_type == B_TYPE) return 0;

  866.   /* Skip B-frames if we are in a hurry. */

  867.   if (avctx->hurry_up && s->pict_type == B_TYPE) return 0;

  868.   /* Skip everything if we are in a hurry >= 5. */

  869.   if (avctx->hurry_up >= 5) return 0;

  870.   if(  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  871.      ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

  872.      || avctx->skip_frame >= AVDISCARD_ALL)

  873.       return 0;

  874. 

  875.   if (s->next_p_frame_damaged) {

  876.     if (s->pict_type == B_TYPE)

  877.       return 0;

  878.     else

  879.       s->next_p_frame_damaged = 0;

  880.   }

  881. 

  882.   if (frame_start (h) < 0)

  883.     return -1;

  884. 

  885.   if (s->pict_type == B_TYPE) {

  886.     h->frame_num_offset = (h->slice_num - h->prev_frame_num);

  887. 

  888.     if (h->frame_num_offset < 0) {

  889.       h->frame_num_offset += 256;

  890.     }

  891.     if (h->frame_num_offset == 0 || h->frame_num_offset >= h->prev_frame_num_offset) {

  892.       av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  893.       return -1;

  894.     }

  895.   } else {

  896.     h->prev_frame_num = h->frame_num;

  897.     h->frame_num = h->slice_num;

  898.     h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num);

  899. 

  900.     if (h->prev_frame_num_offset < 0) {

  901.       h->prev_frame_num_offset += 256;

  902.     }

  903.   }

  904. 

  905.   for(m=0; m<2; m++){

  906.     int i;

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

  908.       int j;

  909.       for(j=-1; j<4; j++)

  910.         h->ref_cache[m][scan8[0] + 8*i + j]= 1;

  911.       if(i<3)

  912.         h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  913.     }

  914.   }

  915. 

  916.   for (s->mb_y=0; s->mb_y < s->mb_height; s->mb_y++) {

  917.     for (s->mb_x=0; s->mb_x < s->mb_width; s->mb_x++) {

  918. 

  919.       if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  920.           ((get_bits_count(&s->gb) & 7) == 0 || show_bits (&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  921. 

  922.         skip_bits(&s->gb, h->next_slice_index - get_bits_count(&s->gb));

  923.         s->gb.size_in_bits = 8*buf_size;

  924. 

  925.         if (svq3_decode_slice_header (h))

  926.           return -1;

  927. 

  928.         /* TODO: support s->mb_skip_run */

  929.       }

  930. 

  931.       mb_type = svq3_get_ue_golomb (&s->gb);

  932. 

  933.       if (s->pict_type == I_TYPE) {

  934.         mb_type += 8;

  935.       } else if (s->pict_type == B_TYPE && mb_type >= 4) {

  936.         mb_type += 4;

  937.       }

  938.       if (mb_type > 33 || svq3_decode_mb (h, mb_type)) {

  939.         av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  940.         return -1;

  941.       }

  942. 

  943.       if (mb_type != 0) {

  944.         hl_decode_mb (h);

  945.       }

  946. 

  947.       if (s->pict_type != B_TYPE && !s->low_delay) {

  948.         s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =

  949.                         (s->pict_type == P_TYPE && mb_type < 8) ? (mb_type - 1) : -1;

  950.       }

  951.     }

  952. 

  953.     ff_draw_horiz_band(s, 16*s->mb_y, 16);

  954.   }

  955. 

  956.   MPV_frame_end(s);

  957. 

  958.   if (s->pict_type == B_TYPE || s->low_delay) {

  959.     *(AVFrame *) data = *(AVFrame *) &s->current_picture;

  960.   } else {

  961.     *(AVFrame *) data = *(AVFrame *) &s->last_picture;

  962.   }

  963. 

  964.   avctx->frame_number = s->picture_number - 1;

  965. 

  966.   /* Do not output the last pic after seeking. */

  967.   if (s->last_picture_ptr || s->low_delay) {

  968.     *data_size = sizeof(AVFrame);

  969.   }

  970. 

  971.   return buf_size;

  972. }

  973. 

  974. 

  975. AVCodec svq3_decoder = {

  976.     "svq3",

  977.     CODEC_TYPE_VIDEO,

  978.     CODEC_ID_SVQ3,

  979.     sizeof(H264Context),

  980.     decode_init,

  981.     NULL,

  982.     decode_end,

  983.     svq3_decode_frame,

  984.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  985. };