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FFmpeg/libavcodec/svq3.c

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  1. /*

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

  3.  *

  4.  * This library is free software; you can redistribute it and/or

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

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

  7.  * version 2 of the License, or (at your option) any later version.

  8.  *

  9.  * This library is distributed in the hope that it will be useful,

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

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

  12.  * Lesser General Public License for more details.

  13.  *

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

  15.  * License along with this library; if not, write to the Free Software

  16.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  17.  *

  18.  *

  19.  * How to use this decoder:

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

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

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

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

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

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

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

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

  28.  *

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

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

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

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

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

  34.  *

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

  36.  * correctly decodes this file:

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

  38.  *

  39.  */

  40.  

  41. /**

  42.  * @file svq3.c

  43.  * svq3 decoder.

  44.  */

  45. 

  46. #define FULLPEL_MODE  1 

  47. #define HALFPEL_MODE  2 

  48. #define THIRDPEL_MODE 3

  49. #define PREDICT_MODE  4

  50.  

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

  52.  o-->o-->o   o

  53.          |  /|

  54.  o   o   o / o

  55.  | / |   |/  |

  56.  o   o   o   o

  57.    / 

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

  59. */

  60. static const uint8_t svq3_scan[16]={

  61.  0+0*4, 1+0*4, 2+0*4, 2+1*4,

  62.  2+2*4, 3+0*4, 3+1*4, 3+2*4,

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

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

  65. };

  66. 

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

  68.   { 0, 0 },

  69.   { 1, 0 }, { 0, 1 },

  70.   { 0, 2 }, { 1, 1 }, { 2, 0 },

  71.   { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  72.   { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  73.   { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

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

  75.   { 4, 3 }, { 3, 4 },

  76.   { 4, 4 }

  77. };

  78. 

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

  80.   { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  81.     { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

  82.   { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 4, 3 }, { 0, 1, 2, 4, 3 },

  83.     { 0, 2, 1, 4, 3 }, { 2, 0, 1, 3, 4 }, { 0, 4, 2, 1, 3 } },

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

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

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

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

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

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

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

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

  92. };

  93. 

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

  95.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  96.     { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

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

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

  99. };

  100. 

  101. static const uint32_t svq3_dequant_coeff[32] = {

  102.    3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  103.    9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  104.   24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  105.   61694, 68745, 77615, 89113,100253,109366,126635,141533

  106. };

  107. 

  108. 

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

  110.     const int qmul= svq3_dequant_coeff[qp];

  111. #define stride 16

  112.     int i;

  113.     int temp[16];

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

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

  116. 

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

  118.         const int offset= y_offset[i];

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

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

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

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

  123. 

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

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

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

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

  128.     }

  129. 

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

  131.         const int offset= x_offset[i];

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

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

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

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

  136. 

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

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

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

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

  141.     }

  142. }

  143. #undef stride

  144. 

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

  146.     const int qmul= svq3_dequant_coeff[qp];

  147.     int i;

  148.     uint8_t *cm = cropTbl + MAX_NEG_CROP;

  149. 

  150.     if (dc) {

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

  152.         block[0] = 0;

  153.     }

  154. 

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

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

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

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

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

  160. 

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

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

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

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

  165.     }

  166. 

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

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

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

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

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

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

  173. 

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

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

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

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

  178.     }

  179. }

  180. 

  181. static void pred4x4_down_left_svq3_c(uint8_t *src, uint8_t *topright, int stride){

  182.     LOAD_TOP_EDGE    

  183.     LOAD_LEFT_EDGE    

  184.     const __attribute__((unused)) int unu0= t0;

  185.     const __attribute__((unused)) int unu1= l0;

  186. 

  187.     src[0+0*stride]=(l1 + t1)>>1;

  188.     src[1+0*stride]=

  189.     src[0+1*stride]=(l2 + t2)>>1;

  190.     src[2+0*stride]=

  191.     src[1+1*stride]=

  192.     src[0+2*stride]=

  193.     src[3+0*stride]=

  194.     src[2+1*stride]=

  195.     src[1+2*stride]=

  196.     src[0+3*stride]=

  197.     src[3+1*stride]=

  198.     src[2+2*stride]=

  199.     src[1+3*stride]=

  200.     src[3+2*stride]=

  201.     src[2+3*stride]=

  202.     src[3+3*stride]=(l3 + t3)>>1;

  203. }

  204. 

  205. static void pred16x16_plane_svq3_c(uint8_t *src, int stride){

  206.     pred16x16_plane_compat_c(src, stride, 1);

  207. }

  208. 

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

  210. 				     int index, const int type) {

  211. 

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

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

  214. 

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

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

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

  218. 

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

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

  221. 

  222.       if (vlc == INVALID_VLC)

  223. 	return -1;

  224. 

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

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

  227. 

  228.       if (type == 3) {

  229. 	if (vlc < 3) {

  230. 	  run   = 0;

  231. 	  level = vlc;

  232. 	} else if (vlc < 4) {

  233. 	  run   = 1;

  234. 	  level = 1;

  235. 	} else {

  236. 	  run   = (vlc & 0x3);

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

  238. 	}

  239.       } else {

  240. 	if (vlc < 16) {

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

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

  243. 	} else if (intra) {

  244. 	  run   = (vlc & 0x7);

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

  246. 	} else {

  247. 	  run   = (vlc & 0xF);

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

  249. 	}

  250.       }

  251. 

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

  253. 	return -1;

  254. 

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

  256.     }

  257. 

  258.     if (type != 2) {

  259.       break;

  260.     }

  261.   }

  262. 

  263.   return 0;

  264. }

  265. 

  266. static inline void svq3_mc_dir_part (MpegEncContext *s,

  267. 				     int x, int y, int width, int height,

  268. 				     int mx, int my, int dxy,

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

  270. 

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

  272.   uint8_t *src, *dest;

  273.   int i, emu = 0;

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

  275. 

  276.   mx += x;

  277.   my += y;

  278.   

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

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

  281. 

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

  283.       emu = 1;

  284.     }

  285. 

  286.     mx = clip (mx, -16, (s->h_edge_pos - width  + 15));

  287.     my = clip (my, -16, (s->v_edge_pos - height + 15));

  288.   }

  289. 

  290.   /* form component predictions */

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

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

  293. 

  294.   if (emu) {

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

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

  297.     src = s->edge_emu_buffer;

  298.   }

  299.   if(thirdpel)

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

  301.   else

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

  303. 

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

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

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

  307.     width  = (width  >> 1);

  308.     height = (height >> 1);

  309.     blocksize++;

  310. 

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

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

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

  314. 

  315.       if (emu) {

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

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

  318.         src = s->edge_emu_buffer;

  319.       }

  320.       if(thirdpel)

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

  322.       else

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

  324.     }

  325.   }

  326. }

  327. 

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

  329. 

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

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

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

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

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

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

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

  337. 

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

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

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

  341.       int dxy;

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

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

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

  345. 

  346.       if (mode != PREDICT_MODE) {

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

  348.       } else {

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

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

  351. 

  352. 	if (dir == 0) {

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

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

  355. 	} else {

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

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

  358. 	}

  359.       }

  360. 

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

  362.       mx = clip (mx, extra_width - 6*x, h_edge_pos - 6*x);

  363.       my = clip (my, extra_width - 6*y, v_edge_pos - 6*y);

  364. 

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

  366.       if (mode == PREDICT_MODE) {

  367. 	dx = dy = 0;

  368.       } else {

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

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

  371. 

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

  373. 	  return -1;

  374. 	}

  375.       }

  376. 

  377.       /* compute motion vector */

  378.       if (mode == THIRDPEL_MODE) {

  379. 	int fx, fy;

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

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

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

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

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

  385. 

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

  387. 	mx += mx;

  388. 	my += my;

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

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

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

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

  393. 

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

  395. 	mx *= 3;

  396. 	my *= 3;

  397.       } else {

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

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

  400. 

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

  402. 	mx *= 6;

  403. 	my *= 6;

  404.       }

  405. 

  406.       /* update mv_cache */

  407.       if (mode != PREDICT_MODE) {

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

  409. 

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

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

  412. 

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

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

  415. 	  }

  416. 	}

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

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

  419. 	}

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

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

  422. 	}

  423.       }

  424. 

  425.       /* write back motion vectors */

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

  427.     }

  428.   }

  429. 

  430.   return 0;

  431. }

  432. 

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

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

  435.   int cbp = 0;

  436.   uint32_t vlc;

  437.   int8_t *top, *left;

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

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

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

  441. 

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

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

  444.   h->topright_samples_available	= 0xFFFF;

  445. 

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

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

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

  449. 

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

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

  452.       }

  453. 

  454.       mb_type = MB_TYPE_SKIP;

  455.     } else {

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

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

  458.         return -1;

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

  460.         return -1;

  461. 

  462.       mb_type = MB_TYPE_16x16;

  463.     }

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

  465.     if (h->thirdpel_flag && h->halfpel_flag == !get_bits (&s->gb, 1)) {

  466.       mode = THIRDPEL_MODE;

  467.     } else if (h->halfpel_flag && h->thirdpel_flag == !get_bits (&s->gb, 1)) {

  468.       mode = HALFPEL_MODE;

  469.     } else {

  470.       mode = FULLPEL_MODE;

  471.     }

  472. 

  473.     /* fill caches */

  474.     /* note ref_cache should contain here:

  475.         ????????

  476.         ???11111

  477.         N??11111

  478.         N??11111

  479.         N??11111

  480.         N

  481.     */

  482.     

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

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

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

  486. 	  *(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];

  487. 	}

  488.       } else {

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

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

  491. 	}

  492.       }

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

  494. 	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));

  495. 	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);

  496. 

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

  498. 	  *(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];

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

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

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

  502. 	}else

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

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

  505. 	  *(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];

  506. 	  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;

  507. 	}else

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

  509.       }else

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

  511. 

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

  513. 	break;

  514.     }

  515. 

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

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

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

  519.         return -1;

  520.     } else {	/* B_TYPE */

  521.       if (mb_type != 2) {

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

  523.           return -1;

  524.       } else {

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

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

  527. 	}

  528.       }

  529.       if (mb_type != 1) {

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

  531.           return -1;

  532.       } else {

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

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

  535. 	}

  536.       }

  537.     }

  538. 

  539.     mb_type = MB_TYPE_16x16;

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

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

  542. 

  543.     if (mb_type == 8) {

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

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

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

  547. 	}

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

  549. 	  h->left_samples_available = 0x5F5F;

  550. 	}

  551.       }

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

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

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

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

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

  557. 

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

  559. 	  h->top_samples_available = 0x33FF;

  560. 	}

  561.       }

  562. 

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

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

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

  566. 

  567. 	if (vlc >= 25)

  568. 	  return -1;

  569. 

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

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

  572. 

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

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

  575. 

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

  577. 	  return -1;

  578.       }

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

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

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

  582.       }

  583.     }

  584. 

  585.     write_back_intra_pred_mode (h);

  586. 

  587.     if (mb_type == 8) {

  588.       check_intra4x4_pred_mode (h);

  589. 

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

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

  592.     } else {

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

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

  595.       }

  596. 

  597.       h->top_samples_available  = 0x33FF;

  598.       h->left_samples_available = 0x5F5F;

  599.     }

  600. 

  601.     mb_type = MB_TYPE_INTRA4x4;

  602.   } else {			/* INTRA16x16 */

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

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

  605. 

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

  607.       return -1;

  608. 

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

  610.     mb_type = MB_TYPE_INTRA16x16;

  611.   }

  612. 

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

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

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

  616.     }

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

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

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

  620.       }

  621.     }

  622.   }

  623.   if (!IS_INTRA4x4(mb_type)) {

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

  625.   }

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

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

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

  629.   }

  630. 

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

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

  633.       return -1;

  634. 

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

  636.   }

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

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

  639. 

  640.     if (s->qscale > 31)

  641.       return -1;

  642.   }

  643.   if (IS_INTRA16x16(mb_type)) {

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

  645.       return -1;

  646.   }

  647. 

  648.   if (cbp) {

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

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

  651. 

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

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

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

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

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

  657. 

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

  659. 	    return -1;

  660. 	}

  661.       }

  662.     }

  663. 

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

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

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

  667. 	  return -1;

  668.       }

  669. 

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

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

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

  673. 

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

  675. 	    return -1;

  676. 	}

  677.       }

  678.     }

  679.   }

  680. 

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

  682. 

  683.   if (IS_INTRA(mb_type)) {

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

  685.   }

  686. 

  687.   return 0;

  688. }

  689. 

  690. static int svq3_decode_slice_header (H264Context *h) {

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

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

  693.   int i, header;

  694. 

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

  696. 

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

  698.     /* TODO: what? */

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

  700.     return -1;

  701.   } else {

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

  703. 

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

  705. 

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

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

  708.       return -1;

  709.     }

  710. 

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

  712.     s->gb.index += 8;

  713. 

  714.     if (length > 0) {

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

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

  717.     }

  718.   }

  719. 

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

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

  722.     return -1;

  723.   }

  724. 

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

  726. 

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

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

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

  730.   } else {

  731.     get_bits1 (&s->gb);

  732.     s->mb_skip_run = 0;

  733.   }

  734. 

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

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

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

  738. 

  739.   /* unknown fields */

  740.   get_bits1 (&s->gb);

  741. 

  742.   if (h->unknown_svq3_flag) {

  743.     get_bits1 (&s->gb);

  744.   }

  745. 

  746.   get_bits1 (&s->gb);

  747.   get_bits (&s->gb, 2);

  748. 

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

  750.     get_bits (&s->gb, 8);

  751.   }

  752. 

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

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

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

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

  757.   }

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

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

  760. 

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

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

  763.     }

  764.   }

  765. 

  766.   return 0;

  767. }

  768. 

  769. static int svq3_decode_frame (AVCodecContext *avctx,

  770. 			      void *data, int *data_size,

  771. 			      uint8_t *buf, int buf_size) {

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

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

  774.   int m, mb_type;

  775.   unsigned char *extradata;

  776.   unsigned int size;

  777. 

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

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

  780.   s->unrestricted_mv = 1;

  781. 

  782.   if (!s->context_initialized) {

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

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

  785.     h->pred4x4[DIAG_DOWN_LEFT_PRED] = pred4x4_down_left_svq3_c;

  786.     h->pred16x16[PLANE_PRED8x8] = pred16x16_plane_svq3_c;

  787.     h->halfpel_flag = 1;

  788.     h->thirdpel_flag = 1;

  789.     h->unknown_svq3_flag = 0;

  790.     h->chroma_qp = 4;

  791. 

  792.     if (MPV_common_init (s) < 0)

  793.       return -1;

  794. 

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

  796. 

  797.     alloc_tables (h);

  798. 

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

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

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

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

  803.         break;

  804.       extradata++;

  805.     }

  806. 

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

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

  809. 

  810.       GetBitContext gb;

  811. 

  812.       size = BE_32(&extradata[4]);

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

  814. 

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

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

  817. 	get_bits (&gb, 12);

  818. 	get_bits (&gb, 12);

  819.       }

  820. 

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

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

  823. 

  824.       /* unknown fields */

  825.       get_bits1 (&gb);

  826.       get_bits1 (&gb);

  827.       get_bits1 (&gb);

  828.       get_bits1 (&gb);

  829. 

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

  831. 

  832.       /* unknown field */

  833.       get_bits1 (&gb);

  834. 

  835.       while (get_bits1 (&gb)) {

  836. 	get_bits (&gb, 8);

  837.       }

  838. 

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

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

  841.     }

  842.   }

  843. 

  844.   /* special case for last picture */

  845.   if (buf_size == 0) {

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

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

  848.       *data_size = sizeof(AVFrame);

  849.     }

  850.     return 0;

  851.   }

  852. 

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

  854. 

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

  856. 

  857.   if (svq3_decode_slice_header (h))

  858.     return -1;

  859. 

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

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

  862. 

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

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

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

  866.       s->adaptive_quant, s->qscale

  867.       );

  868.   }

  869. 

  870.   /* for hurry_up==5 */

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

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

  873. 

  874.   /* skip b frames if we dont have reference frames */

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

  876.   /* skip b frames if we are in a hurry */

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

  878.   /* skip everything if we are in a hurry >= 5 */

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

  880. 

  881.   if (s->next_p_frame_damaged) {

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

  883.       return 0;

  884.     else

  885.       s->next_p_frame_damaged = 0;

  886.   }

  887. 

  888.   frame_start (h);

  889. 

  890.   if (s->pict_type == 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.       h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  917.     }

  918.   }

  919.   

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

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

  922. 

  923.       if ( (s->gb.index + 7) >= s->gb.size_in_bits &&

  924. 	  ((s->gb.index & 7) == 0 || show_bits (&s->gb, (-s->gb.index & 7)) == 0)) {

  925. 

  926. 	s->gb.index = h->next_slice_index;

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

  928. 

  929. 	if (svq3_decode_slice_header (h))

  930. 	  return -1;

  931. 

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

  933.       }

  934. 

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

  936. 

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

  938. 	mb_type += 8;

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

  940. 	mb_type += 4;

  941.       }

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

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

  944. 	return -1;

  945.       }

  946. 

  947.       if (mb_type != 0) {

  948. 	hl_decode_mb (h);

  949.       }

  950. 

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

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

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

  954.       }

  955.     }

  956. 

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

  958.   }

  959. 

  960.   MPV_frame_end(s);

  961. 

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

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

  964.   } else {

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

  966.   }

  967. 

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

  969. 

  970.   /* dont output the last pic after seeking */

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

  972.     *data_size = sizeof(AVFrame);

  973.   }

  974. 

  975.   return buf_size;

  976. }

  977. 

  978. 

  979. AVCodec svq3_decoder = {

  980.     "svq3",

  981.     CODEC_TYPE_VIDEO,

  982.     CODEC_ID_SVQ3,

  983.     sizeof(H264Context),

  984.     decode_init,

  985.     NULL,

  986.     decode_end,

  987.     svq3_decode_frame,

  988.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,

  989. };