ituh263dec.c
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1 /*
2  * ITU H263 bitstream decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * H263+ support.
5  * Copyright (c) 2001 Juan J. Sierralta P
6  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7  *
8  * This file is part of Libav.
9  *
10  * Libav is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * Libav is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with Libav; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
30 //#define DEBUG
31 #include <limits.h>
32 
33 #include "libavutil/imgutils.h"
34 #include "libavutil/mathematics.h"
35 #include "dsputil.h"
36 #include "avcodec.h"
37 #include "mpegvideo.h"
38 #include "h263.h"
39 #include "mathops.h"
40 #include "unary.h"
41 #include "flv.h"
42 #include "mpeg4video.h"
43 
44 //#undef NDEBUG
45 //#include <assert.h>
46 
47 // The defines below define the number of bits that are read at once for
48 // reading vlc values. Changing these may improve speed and data cache needs
49 // be aware though that decreasing them may need the number of stages that is
50 // passed to get_vlc* to be increased.
51 #define MV_VLC_BITS 9
52 #define H263_MBTYPE_B_VLC_BITS 6
53 #define CBPC_B_VLC_BITS 3
54 
55 static const int h263_mb_type_b_map[15]= {
68  0, //stuffing
71 };
72 
75  av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n",
77  s->gb.size_in_bits, 1-s->no_rounding,
78  s->obmc ? " AP" : "",
79  s->umvplus ? " UMV" : "",
80  s->h263_long_vectors ? " LONG" : "",
81  s->h263_plus ? " +" : "",
82  s->h263_aic ? " AIC" : "",
83  s->alt_inter_vlc ? " AIV" : "",
84  s->modified_quant ? " MQ" : "",
85  s->loop_filter ? " LOOP" : "",
86  s->h263_slice_structured ? " SS" : "",
88  );
89  }
90 }
91 
92 /***********************************************/
93 /* decoding */
94 
98 static VLC mv_vlc;
101 
102 /* init vlcs */
103 
104 /* XXX: find a better solution to handle static init */
106 {
107  static int done = 0;
108 
109  if (!done) {
110  done = 1;
111 
112  INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
114  ff_h263_intra_MCBPC_code, 1, 1, 72);
115  INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
117  ff_h263_inter_MCBPC_code, 1, 1, 198);
118  INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
119  &ff_h263_cbpy_tab[0][1], 2, 1,
120  &ff_h263_cbpy_tab[0][0], 2, 1, 64);
121  INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
122  &ff_mvtab[0][1], 2, 1,
123  &ff_mvtab[0][0], 2, 1, 538);
128  INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
129  &ff_h263_mbtype_b_tab[0][1], 2, 1,
130  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
131  INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
132  &ff_cbpc_b_tab[0][1], 2, 1,
133  &ff_cbpc_b_tab[0][0], 2, 1, 8);
134  }
135 }
136 
138 {
139  int i, mb_pos;
140 
141  for(i=0; i<6; i++){
142  if(s->mb_num-1 <= ff_mba_max[i]) break;
143  }
144  mb_pos= get_bits(&s->gb, ff_mba_length[i]);
145  s->mb_x= mb_pos % s->mb_width;
146  s->mb_y= mb_pos / s->mb_width;
147 
148  return mb_pos;
149 }
150 
156 {
157  unsigned int val, gob_number;
158  int left;
159 
160  /* Check for GOB Start Code */
161  val = show_bits(&s->gb, 16);
162  if(val)
163  return -1;
164 
165  /* We have a GBSC probably with GSTUFF */
166  skip_bits(&s->gb, 16); /* Drop the zeros */
167  left= get_bits_left(&s->gb);
168  //MN: we must check the bits left or we might end in a infinite loop (or segfault)
169  for(;left>13; left--){
170  if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
171  }
172  if(left<=13)
173  return -1;
174 
175  if(s->h263_slice_structured){
176  if(get_bits1(&s->gb)==0)
177  return -1;
178 
180 
181  if(s->mb_num > 1583)
182  if(get_bits1(&s->gb)==0)
183  return -1;
184 
185  s->qscale = get_bits(&s->gb, 5); /* SQUANT */
186  if(get_bits1(&s->gb)==0)
187  return -1;
188  skip_bits(&s->gb, 2); /* GFID */
189  }else{
190  gob_number = get_bits(&s->gb, 5); /* GN */
191  s->mb_x= 0;
192  s->mb_y= s->gob_index* gob_number;
193  skip_bits(&s->gb, 2); /* GFID */
194  s->qscale = get_bits(&s->gb, 5); /* GQUANT */
195  }
196 
197  if(s->mb_y >= s->mb_height)
198  return -1;
199 
200  if(s->qscale==0)
201  return -1;
202 
203  return 0;
204 }
205 
213 {
214  assert(p < end);
215 
216  end-=2;
217  p++;
218  for(;p<end; p+=2){
219  if(!*p){
220  if (!p[-1] && p[1]) return p - 1;
221  else if(!p[ 1] && p[2]) return p;
222  }
223  }
224  return end+2;
225 }
226 
232  int left, pos, ret;
233 
234  if(s->codec_id==AV_CODEC_ID_MPEG4){
235  skip_bits1(&s->gb);
236  align_get_bits(&s->gb);
237  }
238 
239  if(show_bits(&s->gb, 16)==0){
240  pos= get_bits_count(&s->gb);
243  else
244  ret= h263_decode_gob_header(s);
245  if(ret>=0)
246  return pos;
247  }
248  //OK, it's not where it is supposed to be ...
249  s->gb= s->last_resync_gb;
250  align_get_bits(&s->gb);
251  left= get_bits_left(&s->gb);
252 
253  for(;left>16+1+5+5; left-=8){
254  if(show_bits(&s->gb, 16)==0){
255  GetBitContext bak= s->gb;
256 
257  pos= get_bits_count(&s->gb);
260  else
261  ret= h263_decode_gob_header(s);
262  if(ret>=0)
263  return pos;
264 
265  s->gb= bak;
266  }
267  skip_bits(&s->gb, 8);
268  }
269 
270  return -1;
271 }
272 
273 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
274 {
275  int code, val, sign, shift;
276  code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
277 
278  if (code == 0)
279  return pred;
280  if (code < 0)
281  return 0xffff;
282 
283  sign = get_bits1(&s->gb);
284  shift = f_code - 1;
285  val = code;
286  if (shift) {
287  val = (val - 1) << shift;
288  val |= get_bits(&s->gb, shift);
289  val++;
290  }
291  if (sign)
292  val = -val;
293  val += pred;
294 
295  /* modulo decoding */
296  if (!s->h263_long_vectors) {
297  val = sign_extend(val, 5 + f_code);
298  } else {
299  /* horrible h263 long vector mode */
300  if (pred < -31 && val < -63)
301  val += 64;
302  if (pred > 32 && val > 63)
303  val -= 64;
304 
305  }
306  return val;
307 }
308 
309 
310 /* Decode RVLC of H.263+ UMV */
312 {
313  int code = 0, sign;
314 
315  if (get_bits1(&s->gb)) /* Motion difference = 0 */
316  return pred;
317 
318  code = 2 + get_bits1(&s->gb);
319 
320  while (get_bits1(&s->gb))
321  {
322  code <<= 1;
323  code += get_bits1(&s->gb);
324  }
325  sign = code & 1;
326  code >>= 1;
327 
328  code = (sign) ? (pred - code) : (pred + code);
329  av_dlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
330  return code;
331 
332 }
333 
337 static void preview_obmc(MpegEncContext *s){
338  GetBitContext gb= s->gb;
339 
340  int cbpc, i, pred_x, pred_y, mx, my;
341  int16_t *mot_val;
342  const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
343  const int stride= s->b8_stride*2;
344 
345  for(i=0; i<4; i++)
346  s->block_index[i]+= 2;
347  for(i=4; i<6; i++)
348  s->block_index[i]+= 1;
349  s->mb_x++;
350 
351  assert(s->pict_type == AV_PICTURE_TYPE_P);
352 
353  do{
354  if (get_bits1(&s->gb)) {
355  /* skip mb */
356  mot_val = s->current_picture.f.motion_val[0][s->block_index[0]];
357  mot_val[0 ]= mot_val[2 ]=
358  mot_val[0+stride]= mot_val[2+stride]= 0;
359  mot_val[1 ]= mot_val[3 ]=
360  mot_val[1+stride]= mot_val[3+stride]= 0;
361 
363  goto end;
364  }
365  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
366  }while(cbpc == 20);
367 
368  if(cbpc & 4){
370  }else{
371  get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
372  if (cbpc & 8) {
373  if(s->modified_quant){
374  if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
375  else skip_bits(&s->gb, 5);
376  }else
377  skip_bits(&s->gb, 2);
378  }
379 
380  if ((cbpc & 16) == 0) {
382  /* 16x16 motion prediction */
383  mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
384  if (s->umvplus)
385  mx = h263p_decode_umotion(s, pred_x);
386  else
387  mx = ff_h263_decode_motion(s, pred_x, 1);
388 
389  if (s->umvplus)
390  my = h263p_decode_umotion(s, pred_y);
391  else
392  my = ff_h263_decode_motion(s, pred_y, 1);
393 
394  mot_val[0 ]= mot_val[2 ]=
395  mot_val[0+stride]= mot_val[2+stride]= mx;
396  mot_val[1 ]= mot_val[3 ]=
397  mot_val[1+stride]= mot_val[3+stride]= my;
398  } else {
400  for(i=0;i<4;i++) {
401  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
402  if (s->umvplus)
403  mx = h263p_decode_umotion(s, pred_x);
404  else
405  mx = ff_h263_decode_motion(s, pred_x, 1);
406 
407  if (s->umvplus)
408  my = h263p_decode_umotion(s, pred_y);
409  else
410  my = ff_h263_decode_motion(s, pred_y, 1);
411  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
412  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
413  mot_val[0] = mx;
414  mot_val[1] = my;
415  }
416  }
417  }
418 end:
419 
420  for(i=0; i<4; i++)
421  s->block_index[i]-= 2;
422  for(i=4; i<6; i++)
423  s->block_index[i]-= 1;
424  s->mb_x--;
425 
426  s->gb= gb;
427 }
428 
430  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
431 
432  if(s->modified_quant){
433  if(get_bits1(&s->gb))
435  else
436  s->qscale= get_bits(&s->gb, 5);
437  }else
438  s->qscale += quant_tab[get_bits(&s->gb, 2)];
439  ff_set_qscale(s, s->qscale);
440 }
441 
443  int n, int coded)
444 {
445  int code, level, i, j, last, run;
446  RLTable *rl = &ff_h263_rl_inter;
447  const uint8_t *scan_table;
448  GetBitContext gb= s->gb;
449 
450  scan_table = s->intra_scantable.permutated;
451  if (s->h263_aic && s->mb_intra) {
452  rl = &ff_rl_intra_aic;
453  i = 0;
454  if (s->ac_pred) {
455  if (s->h263_aic_dir)
456  scan_table = s->intra_v_scantable.permutated; /* left */
457  else
458  scan_table = s->intra_h_scantable.permutated; /* top */
459  }
460  } else if (s->mb_intra) {
461  /* DC coef */
462  if(s->codec_id == AV_CODEC_ID_RV10){
463 #if CONFIG_RV10_DECODER
464  if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
465  int component, diff;
466  component = (n <= 3 ? 0 : n - 4 + 1);
467  level = s->last_dc[component];
468  if (s->rv10_first_dc_coded[component]) {
469  diff = ff_rv_decode_dc(s, n);
470  if (diff == 0xffff)
471  return -1;
472  level += diff;
473  level = level & 0xff; /* handle wrap round */
474  s->last_dc[component] = level;
475  } else {
476  s->rv10_first_dc_coded[component] = 1;
477  }
478  } else {
479  level = get_bits(&s->gb, 8);
480  if (level == 255)
481  level = 128;
482  }
483 #endif
484  }else{
485  level = get_bits(&s->gb, 8);
486  if((level&0x7F) == 0){
487  av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
489  return -1;
490  }
491  if (level == 255)
492  level = 128;
493  }
494  block[0] = level;
495  i = 1;
496  } else {
497  i = 0;
498  }
499  if (!coded) {
500  if (s->mb_intra && s->h263_aic)
501  goto not_coded;
502  s->block_last_index[n] = i - 1;
503  return 0;
504  }
505 retry:
506  for(;;) {
507  code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
508  if (code < 0){
509  av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
510  return -1;
511  }
512  if (code == rl->n) {
513  /* escape */
514  if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
515  ff_flv2_decode_ac_esc(&s->gb, &level, &run, &last);
516  } else {
517  last = get_bits1(&s->gb);
518  run = get_bits(&s->gb, 6);
519  level = (int8_t)get_bits(&s->gb, 8);
520  if(level == -128){
521  if (s->codec_id == AV_CODEC_ID_RV10) {
522  /* XXX: should patch encoder too */
523  level = get_sbits(&s->gb, 12);
524  }else{
525  level = get_bits(&s->gb, 5);
526  level |= get_sbits(&s->gb, 6)<<5;
527  }
528  }
529  }
530  } else {
531  run = rl->table_run[code];
532  level = rl->table_level[code];
533  last = code >= rl->last;
534  if (get_bits1(&s->gb))
535  level = -level;
536  }
537  i += run;
538  if (i >= 64){
539  if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
540  //Looks like a hack but no, it's the way it is supposed to work ...
541  rl = &ff_rl_intra_aic;
542  i = 0;
543  s->gb= gb;
544  s->dsp.clear_block(block);
545  goto retry;
546  }
547  av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
548  return -1;
549  }
550  j = scan_table[i];
551  block[j] = level;
552  if (last)
553  break;
554  i++;
555  }
556 not_coded:
557  if (s->mb_intra && s->h263_aic) {
558  ff_h263_pred_acdc(s, block, n);
559  i = 63;
560  }
561  s->block_last_index[n] = i;
562  return 0;
563 }
564 
565 static int h263_skip_b_part(MpegEncContext *s, int cbp)
566 {
567  LOCAL_ALIGNED_16(DCTELEM, dblock, [64]);
568  int i, mbi;
569 
570  /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
571  * but real value should be restored in order to be used later (in OBMC condition)
572  */
573  mbi = s->mb_intra;
574  s->mb_intra = 0;
575  for (i = 0; i < 6; i++) {
576  if (h263_decode_block(s, dblock, i, cbp&32) < 0)
577  return -1;
578  cbp+=cbp;
579  }
580  s->mb_intra = mbi;
581  return 0;
582 }
583 
584 static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
585 {
586  int c, mv = 1;
587 
588  if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
589  c = get_bits1(gb);
590  if (pb_frame == 2 && c)
591  mv = !get_bits1(gb);
592  } else { // h.263 Annex M improved PB-frame
593  mv = get_unary(gb, 0, 4) + 1;
594  c = mv & 1;
595  mv = !!(mv & 2);
596  }
597  if(c)
598  *cbpb = get_bits(gb, 6);
599  return mv;
600 }
601 
603  DCTELEM block[6][64])
604 {
605  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
606  int16_t *mot_val;
607  const int xy= s->mb_x + s->mb_y * s->mb_stride;
608  int cbpb = 0, pb_mv_count = 0;
609 
610  assert(!s->h263_pred);
611 
612  if (s->pict_type == AV_PICTURE_TYPE_P) {
613  do{
614  if (get_bits1(&s->gb)) {
615  /* skip mb */
616  s->mb_intra = 0;
617  for(i=0;i<6;i++)
618  s->block_last_index[i] = -1;
619  s->mv_dir = MV_DIR_FORWARD;
620  s->mv_type = MV_TYPE_16X16;
622  s->mv[0][0][0] = 0;
623  s->mv[0][0][1] = 0;
624  s->mb_skipped = !(s->obmc | s->loop_filter);
625  goto end;
626  }
627  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
628  if (cbpc < 0){
629  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
630  return -1;
631  }
632  }while(cbpc == 20);
633 
634  s->dsp.clear_blocks(s->block[0]);
635 
636  dquant = cbpc & 8;
637  s->mb_intra = ((cbpc & 4) != 0);
638  if (s->mb_intra) goto intra;
639 
640  if(s->pb_frame && get_bits1(&s->gb))
641  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
642  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
643 
644  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
645  cbpy ^= 0xF;
646 
647  cbp = (cbpc & 3) | (cbpy << 2);
648  if (dquant) {
650  }
651 
652  s->mv_dir = MV_DIR_FORWARD;
653  if ((cbpc & 16) == 0) {
655  /* 16x16 motion prediction */
656  s->mv_type = MV_TYPE_16X16;
657  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
658  if (s->umvplus)
659  mx = h263p_decode_umotion(s, pred_x);
660  else
661  mx = ff_h263_decode_motion(s, pred_x, 1);
662 
663  if (mx >= 0xffff)
664  return -1;
665 
666  if (s->umvplus)
667  my = h263p_decode_umotion(s, pred_y);
668  else
669  my = ff_h263_decode_motion(s, pred_y, 1);
670 
671  if (my >= 0xffff)
672  return -1;
673  s->mv[0][0][0] = mx;
674  s->mv[0][0][1] = my;
675 
676  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
677  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
678  } else {
680  s->mv_type = MV_TYPE_8X8;
681  for(i=0;i<4;i++) {
682  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
683  if (s->umvplus)
684  mx = h263p_decode_umotion(s, pred_x);
685  else
686  mx = ff_h263_decode_motion(s, pred_x, 1);
687  if (mx >= 0xffff)
688  return -1;
689 
690  if (s->umvplus)
691  my = h263p_decode_umotion(s, pred_y);
692  else
693  my = ff_h263_decode_motion(s, pred_y, 1);
694  if (my >= 0xffff)
695  return -1;
696  s->mv[0][i][0] = mx;
697  s->mv[0][i][1] = my;
698  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
699  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
700  mot_val[0] = mx;
701  mot_val[1] = my;
702  }
703  }
704  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
705  int mb_type;
706  const int stride= s->b8_stride;
707  int16_t *mot_val0 = s->current_picture.f.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
708  int16_t *mot_val1 = s->current_picture.f.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
709 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
710 
711  //FIXME ugly
712  mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
713  mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
714  mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
715  mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
716 
717  do{
718  mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
719  if (mb_type < 0){
720  av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
721  return -1;
722  }
723 
724  mb_type= h263_mb_type_b_map[ mb_type ];
725  }while(!mb_type);
726 
727  s->mb_intra = IS_INTRA(mb_type);
728  if(HAS_CBP(mb_type)){
729  s->dsp.clear_blocks(s->block[0]);
730  cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
731  if(s->mb_intra){
732  dquant = IS_QUANT(mb_type);
733  goto intra;
734  }
735 
736  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
737 
738  if (cbpy < 0){
739  av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
740  return -1;
741  }
742 
743  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
744  cbpy ^= 0xF;
745 
746  cbp = (cbpc & 3) | (cbpy << 2);
747  }else
748  cbp=0;
749 
750  assert(!s->mb_intra);
751 
752  if(IS_QUANT(mb_type)){
754  }
755 
756  if(IS_DIRECT(mb_type)){
757  if (!s->pp_time)
758  return AVERROR_INVALIDDATA;
760  mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);
761  }else{
762  s->mv_dir = 0;
764 //FIXME UMV
765 
766  if(USES_LIST(mb_type, 0)){
767  int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my);
768  s->mv_dir = MV_DIR_FORWARD;
769 
770  mx = ff_h263_decode_motion(s, mx, 1);
771  my = ff_h263_decode_motion(s, my, 1);
772 
773  s->mv[0][0][0] = mx;
774  s->mv[0][0][1] = my;
775  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
776  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
777  }
778 
779  if(USES_LIST(mb_type, 1)){
780  int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my);
781  s->mv_dir |= MV_DIR_BACKWARD;
782 
783  mx = ff_h263_decode_motion(s, mx, 1);
784  my = ff_h263_decode_motion(s, my, 1);
785 
786  s->mv[1][0][0] = mx;
787  s->mv[1][0][1] = my;
788  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
789  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
790  }
791  }
792 
793  s->current_picture.f.mb_type[xy] = mb_type;
794  } else { /* I-Frame */
795  do{
796  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
797  if (cbpc < 0){
798  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
799  return -1;
800  }
801  }while(cbpc == 8);
802 
803  s->dsp.clear_blocks(s->block[0]);
804 
805  dquant = cbpc & 4;
806  s->mb_intra = 1;
807 intra:
809  if (s->h263_aic) {
810  s->ac_pred = get_bits1(&s->gb);
811  if(s->ac_pred){
813 
814  s->h263_aic_dir = get_bits1(&s->gb);
815  }
816  }else
817  s->ac_pred = 0;
818 
819  if(s->pb_frame && get_bits1(&s->gb))
820  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
821  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
822  if(cbpy<0){
823  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
824  return -1;
825  }
826  cbp = (cbpc & 3) | (cbpy << 2);
827  if (dquant) {
829  }
830 
831  pb_mv_count += !!s->pb_frame;
832  }
833 
834  while(pb_mv_count--){
835  ff_h263_decode_motion(s, 0, 1);
836  ff_h263_decode_motion(s, 0, 1);
837  }
838 
839  /* decode each block */
840  for (i = 0; i < 6; i++) {
841  if (h263_decode_block(s, block[i], i, cbp&32) < 0)
842  return -1;
843  cbp+=cbp;
844  }
845 
846  if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
847  return -1;
848  if(s->obmc && !s->mb_intra){
849  if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
850  preview_obmc(s);
851  }
852 end:
853 
854  /* per-MB end of slice check */
855  {
856  int v= show_bits(&s->gb, 16);
857 
858  if (get_bits_left(&s->gb) < 16) {
859  v >>= 16 - get_bits_left(&s->gb);
860  }
861 
862  if(v==0)
863  return SLICE_END;
864  }
865 
866  return SLICE_OK;
867 }
868 
869 /* most is hardcoded. should extend to handle all h263 streams */
871 {
872  int format, width, height, i, ret;
873  uint32_t startcode;
874 
875  align_get_bits(&s->gb);
876 
877  startcode= get_bits(&s->gb, 22-8);
878 
879  for(i= get_bits_left(&s->gb); i>24; i-=8) {
880  startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
881 
882  if(startcode == 0x20)
883  break;
884  }
885 
886  if (startcode != 0x20) {
887  av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
888  return -1;
889  }
890  /* temporal reference */
891  i = get_bits(&s->gb, 8); /* picture timestamp */
892  if( (s->picture_number&~0xFF)+i < s->picture_number)
893  i+= 256;
895  s->picture_number= (s->picture_number&~0xFF) + i;
896 
897  /* PTYPE starts here */
898  if (get_bits1(&s->gb) != 1) {
899  /* marker */
900  av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
901  return -1;
902  }
903  if (get_bits1(&s->gb) != 0) {
904  av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
905  return -1; /* h263 id */
906  }
907  skip_bits1(&s->gb); /* split screen off */
908  skip_bits1(&s->gb); /* camera off */
909  skip_bits1(&s->gb); /* freeze picture release off */
910 
911  format = get_bits(&s->gb, 3);
912  /*
913  0 forbidden
914  1 sub-QCIF
915  10 QCIF
916  7 extended PTYPE (PLUSPTYPE)
917  */
918 
919  if (format != 7 && format != 6) {
920  s->h263_plus = 0;
921  /* H.263v1 */
922  width = ff_h263_format[format][0];
923  height = ff_h263_format[format][1];
924 
926 
927  s->h263_long_vectors = get_bits1(&s->gb);
928 
929  if (get_bits1(&s->gb) != 0) {
930  av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n");
931  return -1; /* SAC: off */
932  }
933  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
934  s->unrestricted_mv = s->h263_long_vectors || s->obmc;
935 
936  s->pb_frame = get_bits1(&s->gb);
937  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
938  skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
939 
940  s->width = width;
941  s->height = height;
942  s->avctx->sample_aspect_ratio= (AVRational){12,11};
943  s->avctx->time_base= (AVRational){1001, 30000};
944  } else {
945  int ufep;
946 
947  /* H.263v2 */
948  s->h263_plus = 1;
949  ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
950 
951  /* ufep other than 0 and 1 are reserved */
952  if (ufep == 1) {
953  /* OPPTYPE */
954  format = get_bits(&s->gb, 3);
955  av_dlog(s->avctx, "ufep=1, format: %d\n", format);
956  s->custom_pcf= get_bits1(&s->gb);
957  s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
958  if (get_bits1(&s->gb) != 0) {
959  av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
960  }
961  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
962  s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
963  s->loop_filter= get_bits1(&s->gb);
964  s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
965 
967  if (get_bits1(&s->gb) != 0) {
968  av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
969  }
970  if (get_bits1(&s->gb) != 0) {
971  av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
972  }
973  s->alt_inter_vlc= get_bits1(&s->gb);
974  s->modified_quant= get_bits1(&s->gb);
975  if(s->modified_quant)
977 
978  skip_bits(&s->gb, 1); /* Prevent start code emulation */
979 
980  skip_bits(&s->gb, 3); /* Reserved */
981  } else if (ufep != 0) {
982  av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
983  return -1;
984  }
985 
986  /* MPPTYPE */
987  s->pict_type = get_bits(&s->gb, 3);
988  switch(s->pict_type){
989  case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
990  case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
991  case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
992  case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
993  case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
994  default:
995  return -1;
996  }
997  skip_bits(&s->gb, 2);
998  s->no_rounding = get_bits1(&s->gb);
999  skip_bits(&s->gb, 4);
1000 
1001  /* Get the picture dimensions */
1002  if (ufep) {
1003  if (format == 6) {
1004  /* Custom Picture Format (CPFMT) */
1005  s->aspect_ratio_info = get_bits(&s->gb, 4);
1006  av_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1007  /* aspect ratios:
1008  0 - forbidden
1009  1 - 1:1
1010  2 - 12:11 (CIF 4:3)
1011  3 - 10:11 (525-type 4:3)
1012  4 - 16:11 (CIF 16:9)
1013  5 - 40:33 (525-type 16:9)
1014  6-14 - reserved
1015  */
1016  width = (get_bits(&s->gb, 9) + 1) * 4;
1017  skip_bits1(&s->gb);
1018  height = get_bits(&s->gb, 9) * 4;
1019  av_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1021  /* aspected dimensions */
1022  s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1023  s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1024  }else{
1026  }
1027  } else {
1028  width = ff_h263_format[format][0];
1029  height = ff_h263_format[format][1];
1030  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1031  }
1032  if ((width == 0) || (height == 0))
1033  return -1;
1034  s->width = width;
1035  s->height = height;
1036 
1037  if(s->custom_pcf){
1038  int gcd;
1039  s->avctx->time_base.den= 1800000;
1040  s->avctx->time_base.num= 1000 + get_bits1(&s->gb);
1041  s->avctx->time_base.num*= get_bits(&s->gb, 7);
1042  if(s->avctx->time_base.num == 0){
1043  av_log(s, AV_LOG_ERROR, "zero framerate\n");
1044  return -1;
1045  }
1046  gcd= av_gcd(s->avctx->time_base.den, s->avctx->time_base.num);
1047  s->avctx->time_base.den /= gcd;
1048  s->avctx->time_base.num /= gcd;
1049  }else{
1050  s->avctx->time_base= (AVRational){1001, 30000};
1051  }
1052  }
1053 
1054  if(s->custom_pcf){
1055  skip_bits(&s->gb, 2); //extended Temporal reference
1056  }
1057 
1058  if (ufep) {
1059  if (s->umvplus) {
1060  if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1061  skip_bits1(&s->gb);
1062  }
1063  if(s->h263_slice_structured){
1064  if (get_bits1(&s->gb) != 0) {
1065  av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1066  }
1067  if (get_bits1(&s->gb) != 0) {
1068  av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1069  }
1070  }
1071  }
1072 
1073  s->qscale = get_bits(&s->gb, 5);
1074  }
1075 
1076  if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1077  return ret;
1078 
1079  s->mb_width = (s->width + 15) / 16;
1080  s->mb_height = (s->height + 15) / 16;
1081  s->mb_num = s->mb_width * s->mb_height;
1082 
1083  if (s->pb_frame) {
1084  skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1085  if (s->custom_pcf)
1086  skip_bits(&s->gb, 2); //extended Temporal reference
1087  skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1088  }
1089 
1090  if (s->pict_type!=AV_PICTURE_TYPE_B) {
1091  s->time = s->picture_number;
1092  s->pp_time = s->time - s->last_non_b_time;
1093  s->last_non_b_time = s->time;
1094  }else{
1095  s->time = s->picture_number;
1096  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1097  if (s->pp_time <=s->pb_time ||
1098  s->pp_time <= s->pp_time - s->pb_time ||
1099  s->pp_time <= 0){
1100  s->pp_time = 2;
1101  s->pb_time = 1;
1102  }
1104  }
1105 
1106  /* PEI */
1107  while (get_bits1(&s->gb) != 0) {
1108  skip_bits(&s->gb, 8);
1109  }
1110 
1111  if(s->h263_slice_structured){
1112  if (get_bits1(&s->gb) != 1) {
1113  av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n");
1114  return -1;
1115  }
1116 
1117  ff_h263_decode_mba(s);
1118 
1119  if (get_bits1(&s->gb) != 1) {
1120  av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n");
1121  return -1;
1122  }
1123  }
1124  s->f_code = 1;
1125 
1126  if(s->h263_aic){
1127  s->y_dc_scale_table=
1129  }else{
1130  s->y_dc_scale_table=
1132  }
1133 
1135  if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO")){
1136  int i,j;
1137  for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1138  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1139  for(i=0; i<13; i++){
1140  for(j=0; j<3; j++){
1141  int v= get_bits(&s->gb, 8);
1142  v |= get_sbits(&s->gb, 8)<<8;
1143  av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1144  }
1145  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1146  }
1147  for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1148  }
1149 
1150  return 0;
1151 }
int rv10_first_dc_coded[3]
Definition: mpegvideo.h:587
int last
number of values for last = 0
Definition: rl.h:40
int aspect_ratio_info
Definition: mpegvideo.h:551
int picture_number
Definition: mpegvideo.h:246
ScanTable intra_v_scantable
Definition: mpegvideo.h:269
const uint8_t ff_cbpc_b_tab[4][2]
Definition: h263data.h:78
static int h263_decode_gob_header(MpegEncContext *s)
Decode the group of blocks header or slice header.
Definition: ituh263dec.c:155
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:96
#define CBPY_VLC_BITS
Definition: h263.h:35
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:325
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:237
RLTable ff_h263_rl_inter
Definition: h263data.h:162
static void align_get_bits(GetBitContext *s)
Definition: get_bits.h:412
const uint8_t ff_h263_intra_MCBPC_code[9]
Definition: h263data.h:36
const uint8_t ff_h263_cbpy_tab[16][2]
Definition: h263data.h:85
int num
numerator
Definition: rational.h:44
enum AVCodecID codec_id
Definition: mpegvideo.h:228
void ff_init_rl(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: mpegvideo.c:1250
int obmc
overlapped block motion compensation
Definition: mpegvideo.h:504
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1724
mpegvideo header.
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
uint8_t permutated[64]
Definition: dsputil.h:183
const int8_t * table_level
Definition: rl.h:43
uint8_t run
Definition: svq3.c:132
const uint16_t ff_h263_format[8][2]
Definition: h263data.h:239
#define SLICE_OK
Definition: mpegvideo.h:665
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:253
int stride
Definition: mace.c:144
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:343
const uint8_t ff_modified_quant_tab[2][32]
Definition: h263data.h:253
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:223
int h263_aic
Advanded INTRA Coding (AIC)
Definition: mpegvideo.h:263
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:316
#define USES_LIST(a, list)
does this mb use listX, note does not work if subMBs
Definition: mpegvideo.h:127
#define HAS_CBP(a)
Definition: mpegvideo.h:128
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1465
int modified_quant
Definition: mpegvideo.h:516
uint8_t ff_mba_length[7]
Definition: h263data.h:271
int alt_inter_vlc
alternative inter vlc
Definition: mpegvideo.h:515
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:496
int64_t time
time of current frame
Definition: mpegvideo.h:524
#define MB_TYPE_INTRA
Definition: mpegvideo.h:105
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:388
#define CONFIG_FLV_DECODER
Definition: config.h:411
uint8_t
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:436
const uint8_t ff_h263_intra_MCBPC_bits[9]
Definition: h263data.h:37
const uint8_t ff_mvtab[33][2]
Definition: h263data.h:91
static VLC h263_mbtype_b_vlc
Definition: ituh263dec.c:99
int64_t pts
presentation timestamp in time_base units (time when frame should be shown to user) If AV_NOPTS_VALUE...
Definition: avcodec.h:1088
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:408
const uint8_t ff_h263_inter_MCBPC_bits[28]
Definition: h263data.h:50
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:314
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:495
#define IS_QUANT(a)
Definition: mpegvideo.h:125
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:192
RLTable ff_rl_intra_aic
Definition: h263data.h:231
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:43
uint16_t pp_time
time distance between the last 2 p,s,i frames
Definition: mpegvideo.h:526
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:248
static int h263_skip_b_part(MpegEncContext *s, int cbp)
Definition: ituh263dec.c:565
#define LOCAL_ALIGNED_16(t, v,...)
Definition: dsputil.h:602
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:238
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.h:280
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2823
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:547
#define H263_MBTYPE_B_VLC_BITS
Definition: ituh263dec.c:52
int h263_plus
h263 plus headers
Definition: mpegvideo.h:225
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:322
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:332
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:359
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:273
static const int h263_mb_type_b_map[15]
Definition: ituh263dec.c:55
int h263_slice_structured
Definition: mpegvideo.h:514
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:34
int64_t av_gcd(int64_t a, int64_t b)
Return the greatest common divisor of a and b.
Definition: mathematics.c:53
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:78
#define IS_INTRA(a)
Definition: mpegvideo.h:109
static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
Definition: ituh263dec.c:584
GetBitContext gb
Definition: mpegvideo.h:614
VLC vlc
decoding only deprecated FIXME remove
Definition: rl.h:47
void(* clear_block)(DCTELEM *block)
Definition: dsputil.h:218
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:59
Definition: get_bits.h:63
struct AVRational AVRational
rational number numerator/denominator
int n
number of entries of table_vlc minus 1
Definition: rl.h:39
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:220
int err_recognition
Definition: mpegvideo.h:498
static DCTELEM block[64]
Definition: dct-test.c:169
int ff_h263_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
Definition: ituh263dec.c:602
int umvplus
== H263+ && unrestricted_mv
Definition: mpegvideo.h:512
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:318
int size_in_bits
Definition: get_bits.h:55
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:251
const int8_t * table_run
Definition: rl.h:42
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:515
#define AV_RL32
Definition: intreadwrite.h:146
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:262
int pb_frame
PB frame mode (0 = none, 1 = base, 2 = improved)
Definition: mpegvideo.h:222
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:97
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.h:248
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:137
const uint8_t ff_h263_inter_MCBPC_code[28]
Definition: h263data.h:41
static int h263p_decode_umotion(MpegEncContext *s, int pred)
Definition: ituh263dec.c:311
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:434
static const float pred[4]
Definition: siprdata.h:259
static const int8_t mv[256][2]
Definition: 4xm.c:73
uint32_t * mb_type
macroblock type table mb_type_base + mb_width + 2
Definition: avcodec.h:1180
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:390
#define MV_VLC_BITS
Definition: ituh263dec.c:51
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:387
static int width
Definition: utils.c:156
int64_t last_non_b_time
Definition: mpegvideo.h:525
external API header
int h263_flv
use flv h263 header
Definition: mpegvideo.h:226
uint8_t ff_h263_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: h263.c:46
int debug
debug
Definition: avcodec.h:2568
ScanTable intra_scantable
Definition: mpegvideo.h:267
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:216
const uint8_t ff_mpeg1_dc_scale_table[128]
Definition: mpegvideo.c:73
int16_t(*[2] motion_val)[2]
motion vector table
Definition: avcodec.h:1172
#define SLICE_END
end marker found
Definition: mpegvideo.h:667
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:95
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:268
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:293
ScanTable intra_h_scantable
Definition: mpegvideo.h:268
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:260
#define CONFIG_MPEG4_DECODER
Definition: config.h:445
#define TEX_VLC_BITS
Definition: dvdata.h:100
const uint8_t * ff_h263_find_resync_marker(const uint8_t *restrict p, const uint8_t *restrict end)
Find the next resync_marker.
Definition: ituh263dec.c:212
#define CBPC_B_VLC_BITS
Definition: ituh263dec.c:53
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:362
static VLC mv_vlc
Definition: ituh263dec.c:98
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:231
int f_code
forward MV resolution
Definition: mpegvideo.h:364
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:121
short DCTELEM
Definition: dsputil.h:39
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:870
#define MV_DIR_FORWARD
Definition: mpegvideo.h:386
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:350
DCTELEM(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:662
const uint8_t ff_h263_mbtype_b_tab[15][2]
Definition: h263data.h:60
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:123
static void h263_decode_dquant(MpegEncContext *s)
Definition: ituh263dec.c:429
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:221
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:326
uint8_t level
Definition: svq3.c:133
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:400
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:250
void(* clear_blocks)(DCTELEM *blocks)
Definition: dsputil.h:219
int height
Definition: gxfenc.c:72
static int h263_decode_block(MpegEncContext *s, DCTELEM *block, int n, int coded)
Definition: ituh263dec.c:442
MpegEncContext.
Definition: mpegvideo.h:212
struct AVCodecContext * avctx
Definition: mpegvideo.h:214
void ff_h263_pred_acdc(MpegEncContext *s, DCTELEM *block, int n)
Definition: h263.c:229
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:249
const uint8_t ff_h263_chroma_qscale_table[32]
Definition: h263data.h:262
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:33
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:194
Bi-dir predicted.
Definition: avutil.h:247
int den
denominator
Definition: rational.h:45
const uint8_t * chroma_qscale_table
qscale -> chroma_qscale (h263)
Definition: mpegvideo.h:327
DSP utils.
static VLC cbpc_b_vlc
Definition: ituh263dec.c:100
void ff_h263_show_pict_info(MpegEncContext *s)
Print picture info if FF_DEBUG_PICT_INFO is set.
Definition: ituh263dec.c:73
#define IS_DIRECT(a)
Definition: mpegvideo.h:114
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
int chroma_qscale
chroma QP
Definition: mpegvideo.h:344
struct AVFrame f
Definition: mpegvideo.h:96
void ff_h263_decode_init_vlc(MpegEncContext *s)
Definition: ituh263dec.c:105
static void preview_obmc(MpegEncContext *s)
read the next MVs for OBMC.
Definition: ituh263dec.c:337
int rv10_version
RV10 version: 0 or 3.
Definition: mpegvideo.h:586
int ff_mpeg4_decode_video_packet_header(MpegEncContext *s)
Decode the next video packet.
int h263_long_vectors
use horrible h263v1 long vector mode
Definition: mpegvideo.h:360
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:391
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:513
#define restrict
Definition: config.h:8
void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last)
Definition: flvdec.c:25
Predicted.
Definition: avutil.h:246
uint16_t ff_mba_max[6]
Definition: h263data.h:267
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:33
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:527