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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. #ifdef CONFIG_ZLIB

  44. #include <zlib.h>

  45. #endif

  46. 

  47. /**

  48.  * @file svq3.c

  49.  * svq3 decoder.

  50.  */

  51. 

  52. #define FULLPEL_MODE  1

  53. #define HALFPEL_MODE  2

  54. #define THIRDPEL_MODE 3

  55. #define PREDICT_MODE  4

  56. 

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

  58.  o-->o-->o   o

  59.          |  /|

  60.  o   o   o / o

  61.  | / |   |/  |

  62.  o   o   o   o

  63.    /

  64.  o-->o-->o-->o

  65. */

  66. static const uint8_t svq3_scan[16]={

  67.  0+0*4, 1+0*4, 2+0*4, 2+1*4,

  68.  2+2*4, 3+0*4, 3+1*4, 3+2*4,

  69.  0+1*4, 0+2*4, 1+1*4, 1+2*4,

  70.  0+3*4, 1+3*4, 2+3*4, 3+3*4,

  71. };

  72. 

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

  74.   { 0, 0 },

  75.   { 1, 0 }, { 0, 1 },

  76.   { 0, 2 }, { 1, 1 }, { 2, 0 },

  77.   { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  78.   { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  79.   { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  80.   { 2, 4 }, { 3, 3 }, { 4, 2 },

  81.   { 4, 3 }, { 3, 4 },

  82.   { 4, 4 }

  83. };

  84. 

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

  86.   { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  87.     { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

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

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

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

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

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

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

  94.   { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 3, 4 }, { 1, 2, 3, 0, 4 },

  95.     { 2, 0, 1, 3, 4 }, { 2, 1, 3, 0, 4 }, { 2, 0, 4, 3, 1 } },

  96.   { { 0, 2,-1,-1,-1 }, { 0, 2, 4, 1, 3 }, { 1, 4, 2, 0, 3 },

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

  98. };

  99. 

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

  101.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  102.     { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  103.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  104.     { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  105. };

  106. 

  107. static const uint32_t svq3_dequant_coeff[32] = {

  108.    3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  109.    9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  110.   24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  111.   61694, 68745, 77615, 89113,100253,109366,126635,141533

  112. };

  113. 

  114. 

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

  116.     const int qmul= svq3_dequant_coeff[qp];

  117. #define stride 16

  118.     int i;

  119.     int temp[16];

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

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

  122. 

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

  124.         const int offset= y_offset[i];

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

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

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

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

  129. 

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

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

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

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

  134.     }

  135. 

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

  137.         const int offset= x_offset[i];

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

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

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

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

  142. 

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

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

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

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

  147.     }

  148. }

  149. #undef stride

  150. 

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

  152.     const int qmul= svq3_dequant_coeff[qp];

  153.     int i;

  154.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  155. 

  156.     if (dc) {

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

  158.         block[0] = 0;

  159.     }

  160. 

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

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

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

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

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

  166. 

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

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

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

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

  171.     }

  172. 

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

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

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

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

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

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

  179. 

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

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

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

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

  184.     }

  185. }

  186. 

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

  188.                                      int index, const int type) {

  189. 

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

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

  192. 

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

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

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

  196. 

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

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

  199. 

  200.       if (vlc == INVALID_VLC)

  201.         return -1;

  202. 

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

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

  205. 

  206.       if (type == 3) {

  207.         if (vlc < 3) {

  208.           run   = 0;

  209.           level = vlc;

  210.         } else if (vlc < 4) {

  211.           run   = 1;

  212.           level = 1;

  213.         } else {

  214.           run   = (vlc & 0x3);

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

  216.         }

  217.       } else {

  218.         if (vlc < 16) {

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

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

  221.         } else if (intra) {

  222.           run   = (vlc & 0x7);

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

  224.         } else {

  225.           run   = (vlc & 0xF);

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

  227.         }

  228.       }

  229. 

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

  231.         return -1;

  232. 

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

  234.     }

  235. 

  236.     if (type != 2) {

  237.       break;

  238.     }

  239.   }

  240. 

  241.   return 0;

  242. }

  243. 

  244. static inline void svq3_mc_dir_part (MpegEncContext *s,

  245.                                      int x, int y, int width, int height,

  246.                                      int mx, int my, int dxy,

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

  248. 

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

  250.   uint8_t *src, *dest;

  251.   int i, emu = 0;

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

  253. 

  254.   mx += x;

  255.   my += y;

  256. 

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

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

  259. 

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

  261.       emu = 1;

  262.     }

  263. 

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

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

  266.   }

  267. 

  268.   /* form component predictions */

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

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

  271. 

  272.   if (emu) {

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

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

  275.     src = s->edge_emu_buffer;

  276.   }

  277.   if(thirdpel)

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

  279.   else

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

  281. 

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

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

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

  285.     width  = (width  >> 1);

  286.     height = (height >> 1);

  287.     blocksize++;

  288. 

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

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

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

  292. 

  293.       if (emu) {

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

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

  296.         src = s->edge_emu_buffer;

  297.       }

  298.       if(thirdpel)

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

  300.       else

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

  302.     }

  303.   }

  304. }

  305. 

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

  307. 

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

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

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

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

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

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

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

  315. 

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

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

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

  319.       int dxy;

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

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

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

  323. 

  324.       if (mode != PREDICT_MODE) {

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

  326.       } else {

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

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

  329. 

  330.         if (dir == 0) {

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

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

  333.         } else {

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

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

  336.         }

  337.       }

  338. 

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

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

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

  342. 

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

  344.       if (mode == PREDICT_MODE) {

  345.         dx = dy = 0;

  346.       } else {

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

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

  349. 

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

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

  352.           return -1;

  353.         }

  354.       }

  355. 

  356.       /* compute motion vector */

  357.       if (mode == THIRDPEL_MODE) {

  358.         int fx, fy;

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

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

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

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

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

  364. 

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

  366.         mx += mx;

  367.         my += my;

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

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

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

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

  372. 

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

  374.         mx *= 3;

  375.         my *= 3;

  376.       } else {

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

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

  379. 

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

  381.         mx *= 6;

  382.         my *= 6;

  383.       }

  384. 

  385.       /* update mv_cache */

  386.       if (mode != PREDICT_MODE) {

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

  388. 

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

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

  391. 

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

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

  394.           }

  395.         }

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

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

  398.         }

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

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

  401.         }

  402.       }

  403. 

  404.       /* write back motion vectors */

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

  406.     }

  407.   }

  408. 

  409.   return 0;

  410. }

  411. 

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

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

  414.   int cbp = 0;

  415.   uint32_t vlc;

  416.   int8_t *top, *left;

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

  418.   const int mb_xy = h->mb_xy;

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

  420. 

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

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

  423.   h->topright_samples_available        = 0xFFFF;

  424. 

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

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

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

  428. 

  429.       if (s->pict_type == FF_B_TYPE) {

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

  431.       }

  432. 

  433.       mb_type = MB_TYPE_SKIP;

  434.     } else {

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

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

  437.         return -1;

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

  439.         return -1;

  440. 

  441.       mb_type = MB_TYPE_16x16;

  442.     }

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

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

  445.       mode = THIRDPEL_MODE;

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

  447.       mode = HALFPEL_MODE;

  448.     } else {

  449.       mode = FULLPEL_MODE;

  450.     }

  451. 

  452.     /* fill caches */

  453.     /* note ref_cache should contain here:

  454.         ????????

  455.         ???11111

  456.         N??11111

  457.         N??11111

  458.         N??11111

  459.     */

  460. 

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

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

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

  464.           *(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];

  465.         }

  466.       } else {

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

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

  469.         }

  470.       }

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

  472.         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));

  473.         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);

  474. 

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

  476.           *(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];

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

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

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

  480.         }else

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

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

  483.           *(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];

  484.           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;

  485.         }else

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

  487.       }else

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

  489. 

  490.       if (s->pict_type != FF_B_TYPE)

  491.         break;

  492.     }

  493. 

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

  495.     if (s->pict_type == FF_P_TYPE) {

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

  497.         return -1;

  498.     } else {        /* FF_B_TYPE */

  499.       if (mb_type != 2) {

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

  501.           return -1;

  502.       } else {

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

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

  505.         }

  506.       }

  507.       if (mb_type != 1) {

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

  509.           return -1;

  510.       } else {

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

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

  513.         }

  514.       }

  515.     }

  516. 

  517.     mb_type = MB_TYPE_16x16;

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

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

  520. 

  521.     if (mb_type == 8) {

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

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

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

  525.         }

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

  527.           h->left_samples_available = 0x5F5F;

  528.         }

  529.       }

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

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

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

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

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

  535. 

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

  537.           h->top_samples_available = 0x33FF;

  538.         }

  539.       }

  540. 

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

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

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

  544. 

  545.         if (vlc >= 25){

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

  547.           return -1;

  548.         }

  549. 

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

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

  552. 

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

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

  555. 

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

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

  558.           return -1;

  559.         }

  560.       }

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

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

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

  564.       }

  565.     }

  566. 

  567.     write_back_intra_pred_mode (h);

  568. 

  569.     if (mb_type == 8) {

  570.       check_intra4x4_pred_mode (h);

  571. 

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

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

  574.     } else {

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

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

  577.       }

  578. 

  579.       h->top_samples_available  = 0x33FF;

  580.       h->left_samples_available = 0x5F5F;

  581.     }

  582. 

  583.     mb_type = MB_TYPE_INTRA4x4;

  584.   } else {                      /* INTRA16x16 */

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

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

  587. 

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

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

  590.       return -1;

  591.     }

  592. 

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

  594.     mb_type = MB_TYPE_INTRA16x16;

  595.   }

  596. 

  597.   if (!IS_INTER(mb_type) && s->pict_type != FF_I_TYPE) {

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

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

  600.     }

  601.     if (s->pict_type == FF_B_TYPE) {

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

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

  604.       }

  605.     }

  606.   }

  607.   if (!IS_INTRA4x4(mb_type)) {

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

  609.   }

  610.   if (!IS_SKIP(mb_type) || s->pict_type == FF_B_TYPE) {

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

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

  613.   }

  614. 

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

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

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

  618.       return -1;

  619.     }

  620. 

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

  622.   }

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

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

  625. 

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

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

  628.       return -1;

  629.     }

  630.   }

  631.   if (IS_INTRA16x16(mb_type)) {

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

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

  634.       return -1;

  635.     }

  636.   }

  637. 

  638.   if (cbp) {

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

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

  641. 

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

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

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

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

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

  647. 

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

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

  650.             return -1;

  651.           }

  652.         }

  653.       }

  654.     }

  655. 

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

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

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

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

  660.           return -1;

  661.         }

  662.       }

  663. 

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

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

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

  667. 

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

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

  670.             return -1;

  671.           }

  672.         }

  673.       }

  674.     }

  675.   }

  676. 

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

  678. 

  679.   if (IS_INTRA(mb_type)) {

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

  681.   }

  682. 

  683.   return 0;

  684. }

  685. 

  686. static int svq3_decode_slice_header (H264Context *h) {

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

  688.   const int mb_xy = h->mb_xy;

  689.   int i, header;

  690. 

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

  692. 

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

  694.     /* TODO: what? */

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

  696.     return -1;

  697.   } else {

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

  699. 

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

  701. 

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

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

  704.       return -1;

  705.     }

  706. 

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

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

  709. 

  710.     if (length > 0) {

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

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

  713.     }

  714.   }

  715. 

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

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

  718.     return -1;

  719.   }

  720. 

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

  722. 

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

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

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

  726.   } else {

  727.     skip_bits1 (&s->gb);

  728.     s->mb_skip_run = 0;

  729.   }

  730. 

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

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

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

  734. 

  735.   /* unknown fields */

  736.   skip_bits1 (&s->gb);

  737. 

  738.   if (h->unknown_svq3_flag) {

  739.     skip_bits1 (&s->gb);

  740.   }

  741. 

  742.   skip_bits1 (&s->gb);

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

  744. 

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

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

  747.   }

  748. 

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

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

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

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

  753.   }

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

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

  756. 

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

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

  759.     }

  760.   }

  761. 

  762.   return 0;

  763. }

  764. 

  765. static int svq3_decode_frame (AVCodecContext *avctx,

  766.                               void *data, int *data_size,

  767.                               const uint8_t *buf, int buf_size) {

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

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

  770.   int m, mb_type;

  771.   unsigned char *extradata;

  772.   unsigned int size;

  773. 

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

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

  776.   s->unrestricted_mv = 1;

  777. 

  778.   if (!s->context_initialized) {

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

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

  781.     h->halfpel_flag = 1;

  782.     h->thirdpel_flag = 1;

  783.     h->unknown_svq3_flag = 0;

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

  785. 

  786.     if (MPV_common_init (s) < 0)

  787.       return -1;

  788. 

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

  790. 

  791.     alloc_tables (h);

  792. 

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

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

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

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

  797.         break;

  798.       extradata++;

  799.     }

  800. 

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

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

  803. 

  804.       GetBitContext gb;

  805. 

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

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

  808. 

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

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

  811.         skip_bits (&gb, 12);

  812.         skip_bits (&gb, 12);

  813.       }

  814. 

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

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

  817. 

  818.       /* unknown fields */

  819.       skip_bits1 (&gb);

  820.       skip_bits1 (&gb);

  821.       skip_bits1 (&gb);

  822.       skip_bits1 (&gb);

  823. 

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

  825. 

  826.       /* unknown field */

  827.       skip_bits1 (&gb);

  828. 

  829.       while (get_bits1 (&gb)) {

  830.         skip_bits (&gb, 8);

  831.       }

  832. 

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

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

  835.     }

  836.   }

  837. 

  838.   /* special case for last picture */

  839.   if (buf_size == 0) {

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

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

  842.       s->next_picture_ptr= NULL;

  843.       *data_size = sizeof(AVFrame);

  844.     }

  845.     return 0;

  846.   }

  847. 

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

  849. 

  850.   s->mb_x = s->mb_y = h->mb_xy = 0;

  851. 

  852.   if (svq3_decode_slice_header (h))

  853.     return -1;

  854. 

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

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

  857. 

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

  859.       av_log(h->s.avctx, AV_LOG_DEBUG, "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

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

  861.       s->adaptive_quant, s->qscale, h->slice_num

  862.       );

  863.   }

  864. 

  865.   /* for hurry_up==5 */

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

  867.   s->current_picture.key_frame = (s->pict_type == FF_I_TYPE);

  868. 

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

  870.   if (s->last_picture_ptr == NULL && s->pict_type == FF_B_TYPE) return 0;

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

  872.   if (avctx->hurry_up && s->pict_type == FF_B_TYPE) return 0;

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

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

  875.   if(  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)

  876.      ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)

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

  878.       return 0;

  879. 

  880.   if (s->next_p_frame_damaged) {

  881.     if (s->pict_type == FF_B_TYPE)

  882.       return 0;

  883.     else

  884.       s->next_p_frame_damaged = 0;

  885.   }

  886. 

  887.   if (frame_start (h) < 0)

  888.     return -1;

  889. 

  890.   if (s->pict_type == FF_B_TYPE) {

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

  892. 

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

  894.       h->frame_num_offset += 256;

  895.     }

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

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

  898.       return -1;

  899.     }

  900.   } else {

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

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

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

  904. 

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

  906.       h->prev_frame_num_offset += 256;

  907.     }

  908.   }

  909. 

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

  911.     int i;

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

  913.       int j;

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

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

  916.       if(i<3)

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

  918.     }

  919.   }

  920. 

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

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

  923.       h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  924. 

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

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

  927. 

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

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

  930. 

  931.         if (svq3_decode_slice_header (h))

  932.           return -1;

  933. 

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

  935.       }

  936. 

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

  938. 

  939.       if (s->pict_type == FF_I_TYPE) {

  940.         mb_type += 8;

  941.       } else if (s->pict_type == FF_B_TYPE && mb_type >= 4) {

  942.         mb_type += 4;

  943.       }

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

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

  946.         return -1;

  947.       }

  948. 

  949.       if (mb_type != 0) {

  950.         hl_decode_mb (h);

  951.       }

  952. 

  953.       if (s->pict_type != FF_B_TYPE && !s->low_delay) {

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

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

  956.       }

  957.     }

  958. 

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

  960.   }

  961. 

  962.   MPV_frame_end(s);

  963. 

  964.   if (s->pict_type == FF_B_TYPE || s->low_delay) {

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

  966.   } else {

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

  968.   }

  969. 

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

  971. 

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

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

  974.     *data_size = sizeof(AVFrame);

  975.   }

  976. 

  977.   return buf_size;

  978. }

  979. 

  980. 

  981. AVCodec svq3_decoder = {

  982.     "svq3",

  983.     CODEC_TYPE_VIDEO,

  984.     CODEC_ID_SVQ3,

  985.     sizeof(H264Context),

  986.     decode_init,

  987.     NULL,

  988.     decode_end,

  989.     svq3_decode_frame,

  990.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  991.     .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3"),

  992. };