Libav
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 #include <limits.h>
31 
32 #include "libavutil/attributes.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/mathematics.h"
35 #include "avcodec.h"
36 #include "mpegvideo.h"
37 #include "h263.h"
38 #include "mathops.h"
39 #include "mpegutils.h"
40 #include "unary.h"
41 #include "flv.h"
42 #include "mpeg4video.h"
43 
44 // The defines below define the number of bits that are read at once for
45 // reading vlc values. Changing these may improve speed and data cache needs
46 // be aware though that decreasing them may need the number of stages that is
47 // passed to get_vlc* to be increased.
48 #define MV_VLC_BITS 9
49 #define H263_MBTYPE_B_VLC_BITS 6
50 #define CBPC_B_VLC_BITS 3
51 
52 static const int h263_mb_type_b_map[15]= {
65  0, //stuffing
68 };
69 
72  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",
74  s->gb.size_in_bits, 1-s->no_rounding,
75  s->obmc ? " AP" : "",
76  s->umvplus ? " UMV" : "",
77  s->h263_long_vectors ? " LONG" : "",
78  s->h263_plus ? " +" : "",
79  s->h263_aic ? " AIC" : "",
80  s->alt_inter_vlc ? " AIV" : "",
81  s->modified_quant ? " MQ" : "",
82  s->loop_filter ? " LOOP" : "",
83  s->h263_slice_structured ? " SS" : "",
85  );
86  }
87 }
88 
89 /***********************************************/
90 /* decoding */
91 
95 static VLC mv_vlc;
97 static VLC cbpc_b_vlc;
98 
99 /* init vlcs */
100 
101 /* XXX: find a better solution to handle static init */
103 {
104  static int done = 0;
105 
106  if (!done) {
107  done = 1;
108 
109  INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
111  ff_h263_intra_MCBPC_code, 1, 1, 72);
112  INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
114  ff_h263_inter_MCBPC_code, 1, 1, 198);
115  INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
116  &ff_h263_cbpy_tab[0][1], 2, 1,
117  &ff_h263_cbpy_tab[0][0], 2, 1, 64);
118  INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
119  &ff_mvtab[0][1], 2, 1,
120  &ff_mvtab[0][0], 2, 1, 538);
125  INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
126  &ff_h263_mbtype_b_tab[0][1], 2, 1,
127  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
128  INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
129  &ff_cbpc_b_tab[0][1], 2, 1,
130  &ff_cbpc_b_tab[0][0], 2, 1, 8);
131  }
132 }
133 
135 {
136  int i, mb_pos;
137 
138  for(i=0; i<6; i++){
139  if(s->mb_num-1 <= ff_mba_max[i]) break;
140  }
141  mb_pos= get_bits(&s->gb, ff_mba_length[i]);
142  s->mb_x= mb_pos % s->mb_width;
143  s->mb_y= mb_pos / s->mb_width;
144 
145  return mb_pos;
146 }
147 
153 {
154  unsigned int val, gob_number;
155  int left;
156 
157  /* Check for GOB Start Code */
158  val = show_bits(&s->gb, 16);
159  if(val)
160  return -1;
161 
162  /* We have a GBSC probably with GSTUFF */
163  skip_bits(&s->gb, 16); /* Drop the zeros */
164  left= get_bits_left(&s->gb);
165  //MN: we must check the bits left or we might end in a infinite loop (or segfault)
166  for(;left>13; left--){
167  if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
168  }
169  if(left<=13)
170  return -1;
171 
172  if(s->h263_slice_structured){
173  if(get_bits1(&s->gb)==0)
174  return -1;
175 
177 
178  if(s->mb_num > 1583)
179  if(get_bits1(&s->gb)==0)
180  return -1;
181 
182  s->qscale = get_bits(&s->gb, 5); /* SQUANT */
183  if(get_bits1(&s->gb)==0)
184  return -1;
185  skip_bits(&s->gb, 2); /* GFID */
186  }else{
187  gob_number = get_bits(&s->gb, 5); /* GN */
188  s->mb_x= 0;
189  s->mb_y= s->gob_index* gob_number;
190  skip_bits(&s->gb, 2); /* GFID */
191  s->qscale = get_bits(&s->gb, 5); /* GQUANT */
192  }
193 
194  if(s->mb_y >= s->mb_height)
195  return -1;
196 
197  if(s->qscale==0)
198  return -1;
199 
200  return 0;
201 }
202 
210 {
211  assert(p < end);
212 
213  end-=2;
214  p++;
215  for(;p<end; p+=2){
216  if(!*p){
217  if (!p[-1] && p[1]) return p - 1;
218  else if(!p[ 1] && p[2]) return p;
219  }
220  }
221  return end+2;
222 }
223 
229  int left, pos, ret;
230 
231  if(s->codec_id==AV_CODEC_ID_MPEG4){
232  skip_bits1(&s->gb);
233  align_get_bits(&s->gb);
234  }
235 
236  if(show_bits(&s->gb, 16)==0){
237  pos= get_bits_count(&s->gb);
240  else
241  ret= h263_decode_gob_header(s);
242  if(ret>=0)
243  return pos;
244  }
245  //OK, it's not where it is supposed to be ...
246  s->gb= s->last_resync_gb;
247  align_get_bits(&s->gb);
248  left= get_bits_left(&s->gb);
249 
250  for(;left>16+1+5+5; left-=8){
251  if(show_bits(&s->gb, 16)==0){
252  GetBitContext bak= s->gb;
253 
254  pos= get_bits_count(&s->gb);
257  else
258  ret= h263_decode_gob_header(s);
259  if(ret>=0)
260  return pos;
261 
262  s->gb= bak;
263  }
264  skip_bits(&s->gb, 8);
265  }
266 
267  return -1;
268 }
269 
270 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
271 {
272  int code, val, sign, shift;
273  code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
274 
275  if (code == 0)
276  return pred;
277  if (code < 0)
278  return 0xffff;
279 
280  sign = get_bits1(&s->gb);
281  shift = f_code - 1;
282  val = code;
283  if (shift) {
284  val = (val - 1) << shift;
285  val |= get_bits(&s->gb, shift);
286  val++;
287  }
288  if (sign)
289  val = -val;
290  val += pred;
291 
292  /* modulo decoding */
293  if (!s->h263_long_vectors) {
294  val = sign_extend(val, 5 + f_code);
295  } else {
296  /* horrible h263 long vector mode */
297  if (pred < -31 && val < -63)
298  val += 64;
299  if (pred > 32 && val > 63)
300  val -= 64;
301 
302  }
303  return val;
304 }
305 
306 
307 /* Decode RVLC of H.263+ UMV */
309 {
310  int code = 0, sign;
311 
312  if (get_bits1(&s->gb)) /* Motion difference = 0 */
313  return pred;
314 
315  code = 2 + get_bits1(&s->gb);
316 
317  while (get_bits1(&s->gb))
318  {
319  code <<= 1;
320  code += get_bits1(&s->gb);
321  }
322  sign = code & 1;
323  code >>= 1;
324 
325  code = (sign) ? (pred - code) : (pred + code);
326  av_dlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
327  return code;
328 
329 }
330 
334 static void preview_obmc(MpegEncContext *s){
335  GetBitContext gb= s->gb;
336 
337  int cbpc, i, pred_x, pred_y, mx, my;
338  int16_t *mot_val;
339  const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
340  const int stride= s->b8_stride*2;
341 
342  for(i=0; i<4; i++)
343  s->block_index[i]+= 2;
344  for(i=4; i<6; i++)
345  s->block_index[i]+= 1;
346  s->mb_x++;
347 
348  assert(s->pict_type == AV_PICTURE_TYPE_P);
349 
350  do{
351  if (get_bits1(&s->gb)) {
352  /* skip mb */
353  mot_val = s->current_picture.motion_val[0][s->block_index[0]];
354  mot_val[0 ]= mot_val[2 ]=
355  mot_val[0+stride]= mot_val[2+stride]= 0;
356  mot_val[1 ]= mot_val[3 ]=
357  mot_val[1+stride]= mot_val[3+stride]= 0;
358 
360  goto end;
361  }
362  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
363  }while(cbpc == 20);
364 
365  if(cbpc & 4){
367  }else{
368  get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
369  if (cbpc & 8) {
370  if(s->modified_quant){
371  if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
372  else skip_bits(&s->gb, 5);
373  }else
374  skip_bits(&s->gb, 2);
375  }
376 
377  if ((cbpc & 16) == 0) {
379  /* 16x16 motion prediction */
380  mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
381  if (s->umvplus)
382  mx = h263p_decode_umotion(s, pred_x);
383  else
384  mx = ff_h263_decode_motion(s, pred_x, 1);
385 
386  if (s->umvplus)
387  my = h263p_decode_umotion(s, pred_y);
388  else
389  my = ff_h263_decode_motion(s, pred_y, 1);
390 
391  mot_val[0 ]= mot_val[2 ]=
392  mot_val[0+stride]= mot_val[2+stride]= mx;
393  mot_val[1 ]= mot_val[3 ]=
394  mot_val[1+stride]= mot_val[3+stride]= my;
395  } else {
397  for(i=0;i<4;i++) {
398  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
399  if (s->umvplus)
400  mx = h263p_decode_umotion(s, pred_x);
401  else
402  mx = ff_h263_decode_motion(s, pred_x, 1);
403 
404  if (s->umvplus)
405  my = h263p_decode_umotion(s, pred_y);
406  else
407  my = ff_h263_decode_motion(s, pred_y, 1);
408  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
409  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
410  mot_val[0] = mx;
411  mot_val[1] = my;
412  }
413  }
414  }
415 end:
416 
417  for(i=0; i<4; i++)
418  s->block_index[i]-= 2;
419  for(i=4; i<6; i++)
420  s->block_index[i]-= 1;
421  s->mb_x--;
422 
423  s->gb= gb;
424 }
425 
427  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
428 
429  if(s->modified_quant){
430  if(get_bits1(&s->gb))
432  else
433  s->qscale= get_bits(&s->gb, 5);
434  }else
435  s->qscale += quant_tab[get_bits(&s->gb, 2)];
436  ff_set_qscale(s, s->qscale);
437 }
438 
439 static int h263_decode_block(MpegEncContext * s, int16_t * block,
440  int n, int coded)
441 {
442  int code, level, i, j, last, run;
443  RLTable *rl = &ff_h263_rl_inter;
444  const uint8_t *scan_table;
445  GetBitContext gb= s->gb;
446 
447  scan_table = s->intra_scantable.permutated;
448  if (s->h263_aic && s->mb_intra) {
449  rl = &ff_rl_intra_aic;
450  i = 0;
451  if (s->ac_pred) {
452  if (s->h263_aic_dir)
453  scan_table = s->intra_v_scantable.permutated; /* left */
454  else
455  scan_table = s->intra_h_scantable.permutated; /* top */
456  }
457  } else if (s->mb_intra) {
458  /* DC coef */
459  if(s->codec_id == AV_CODEC_ID_RV10){
460 #if CONFIG_RV10_DECODER
461  if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
462  int component, diff;
463  component = (n <= 3 ? 0 : n - 4 + 1);
464  level = s->last_dc[component];
465  if (s->rv10_first_dc_coded[component]) {
466  diff = ff_rv_decode_dc(s, n);
467  if (diff == 0xffff)
468  return -1;
469  level += diff;
470  level = level & 0xff; /* handle wrap round */
471  s->last_dc[component] = level;
472  } else {
473  s->rv10_first_dc_coded[component] = 1;
474  }
475  } else {
476  level = get_bits(&s->gb, 8);
477  if (level == 255)
478  level = 128;
479  }
480 #endif
481  }else{
482  level = get_bits(&s->gb, 8);
483  if((level&0x7F) == 0){
484  av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
486  return -1;
487  }
488  if (level == 255)
489  level = 128;
490  }
491  block[0] = level;
492  i = 1;
493  } else {
494  i = 0;
495  }
496  if (!coded) {
497  if (s->mb_intra && s->h263_aic)
498  goto not_coded;
499  s->block_last_index[n] = i - 1;
500  return 0;
501  }
502 retry:
503  for(;;) {
504  code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
505  if (code < 0){
506  av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
507  return -1;
508  }
509  if (code == rl->n) {
510  /* escape */
511  if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
512  ff_flv2_decode_ac_esc(&s->gb, &level, &run, &last);
513  } else {
514  last = get_bits1(&s->gb);
515  run = get_bits(&s->gb, 6);
516  level = (int8_t)get_bits(&s->gb, 8);
517  if(level == -128){
518  if (s->codec_id == AV_CODEC_ID_RV10) {
519  /* XXX: should patch encoder too */
520  level = get_sbits(&s->gb, 12);
521  }else{
522  level = get_bits(&s->gb, 5);
523  level |= get_sbits(&s->gb, 6)<<5;
524  }
525  }
526  }
527  } else {
528  run = rl->table_run[code];
529  level = rl->table_level[code];
530  last = code >= rl->last;
531  if (get_bits1(&s->gb))
532  level = -level;
533  }
534  i += run;
535  if (i >= 64){
536  if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
537  //Looks like a hack but no, it's the way it is supposed to work ...
538  rl = &ff_rl_intra_aic;
539  i = 0;
540  s->gb= gb;
541  s->bdsp.clear_block(block);
542  goto retry;
543  }
544  av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
545  return -1;
546  }
547  j = scan_table[i];
548  block[j] = level;
549  if (last)
550  break;
551  i++;
552  }
553 not_coded:
554  if (s->mb_intra && s->h263_aic) {
555  ff_h263_pred_acdc(s, block, n);
556  i = 63;
557  }
558  s->block_last_index[n] = i;
559  return 0;
560 }
561 
562 static int h263_skip_b_part(MpegEncContext *s, int cbp)
563 {
564  LOCAL_ALIGNED_16(int16_t, dblock, [64]);
565  int i, mbi;
566 
567  /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
568  * but real value should be restored in order to be used later (in OBMC condition)
569  */
570  mbi = s->mb_intra;
571  s->mb_intra = 0;
572  for (i = 0; i < 6; i++) {
573  if (h263_decode_block(s, dblock, i, cbp&32) < 0)
574  return -1;
575  cbp+=cbp;
576  }
577  s->mb_intra = mbi;
578  return 0;
579 }
580 
581 static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
582 {
583  int c, mv = 1;
584 
585  if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
586  c = get_bits1(gb);
587  if (pb_frame == 2 && c)
588  mv = !get_bits1(gb);
589  } else { // h.263 Annex M improved PB-frame
590  mv = get_unary(gb, 0, 4) + 1;
591  c = mv & 1;
592  mv = !!(mv & 2);
593  }
594  if(c)
595  *cbpb = get_bits(gb, 6);
596  return mv;
597 }
598 
600  int16_t block[6][64])
601 {
602  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
603  int16_t *mot_val;
604  const int xy= s->mb_x + s->mb_y * s->mb_stride;
605  int cbpb = 0, pb_mv_count = 0;
606 
607  assert(!s->h263_pred);
608 
609  if (s->pict_type == AV_PICTURE_TYPE_P) {
610  do{
611  if (get_bits1(&s->gb)) {
612  /* skip mb */
613  s->mb_intra = 0;
614  for(i=0;i<6;i++)
615  s->block_last_index[i] = -1;
616  s->mv_dir = MV_DIR_FORWARD;
617  s->mv_type = MV_TYPE_16X16;
619  s->mv[0][0][0] = 0;
620  s->mv[0][0][1] = 0;
621  s->mb_skipped = !(s->obmc | s->loop_filter);
622  goto end;
623  }
624  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
625  if (cbpc < 0){
626  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
627  return -1;
628  }
629  }while(cbpc == 20);
630 
631  s->bdsp.clear_blocks(s->block[0]);
632 
633  dquant = cbpc & 8;
634  s->mb_intra = ((cbpc & 4) != 0);
635  if (s->mb_intra) goto intra;
636 
637  if(s->pb_frame && get_bits1(&s->gb))
638  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
639  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
640 
641  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
642  cbpy ^= 0xF;
643 
644  cbp = (cbpc & 3) | (cbpy << 2);
645  if (dquant) {
647  }
648 
649  s->mv_dir = MV_DIR_FORWARD;
650  if ((cbpc & 16) == 0) {
652  /* 16x16 motion prediction */
653  s->mv_type = MV_TYPE_16X16;
654  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
655  if (s->umvplus)
656  mx = h263p_decode_umotion(s, pred_x);
657  else
658  mx = ff_h263_decode_motion(s, pred_x, 1);
659 
660  if (mx >= 0xffff)
661  return -1;
662 
663  if (s->umvplus)
664  my = h263p_decode_umotion(s, pred_y);
665  else
666  my = ff_h263_decode_motion(s, pred_y, 1);
667 
668  if (my >= 0xffff)
669  return -1;
670  s->mv[0][0][0] = mx;
671  s->mv[0][0][1] = my;
672 
673  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
674  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
675  } else {
677  s->mv_type = MV_TYPE_8X8;
678  for(i=0;i<4;i++) {
679  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
680  if (s->umvplus)
681  mx = h263p_decode_umotion(s, pred_x);
682  else
683  mx = ff_h263_decode_motion(s, pred_x, 1);
684  if (mx >= 0xffff)
685  return -1;
686 
687  if (s->umvplus)
688  my = h263p_decode_umotion(s, pred_y);
689  else
690  my = ff_h263_decode_motion(s, pred_y, 1);
691  if (my >= 0xffff)
692  return -1;
693  s->mv[0][i][0] = mx;
694  s->mv[0][i][1] = my;
695  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
696  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
697  mot_val[0] = mx;
698  mot_val[1] = my;
699  }
700  }
701  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
702  int mb_type;
703  const int stride= s->b8_stride;
704  int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
705  int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
706 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
707 
708  //FIXME ugly
709  mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
710  mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
711  mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
712  mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
713 
714  do{
715  mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
716  if (mb_type < 0){
717  av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
718  return -1;
719  }
720 
721  mb_type= h263_mb_type_b_map[ mb_type ];
722  }while(!mb_type);
723 
724  s->mb_intra = IS_INTRA(mb_type);
725  if(HAS_CBP(mb_type)){
726  s->bdsp.clear_blocks(s->block[0]);
727  cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
728  if(s->mb_intra){
729  dquant = IS_QUANT(mb_type);
730  goto intra;
731  }
732 
733  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
734 
735  if (cbpy < 0){
736  av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
737  return -1;
738  }
739 
740  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
741  cbpy ^= 0xF;
742 
743  cbp = (cbpc & 3) | (cbpy << 2);
744  }else
745  cbp=0;
746 
747  assert(!s->mb_intra);
748 
749  if(IS_QUANT(mb_type)){
751  }
752 
753  if(IS_DIRECT(mb_type)){
754  if (!s->pp_time)
755  return AVERROR_INVALIDDATA;
757  mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);
758  }else{
759  s->mv_dir = 0;
761 //FIXME UMV
762 
763  if(USES_LIST(mb_type, 0)){
764  int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my);
765  s->mv_dir = MV_DIR_FORWARD;
766 
767  mx = ff_h263_decode_motion(s, mx, 1);
768  my = ff_h263_decode_motion(s, my, 1);
769 
770  s->mv[0][0][0] = mx;
771  s->mv[0][0][1] = my;
772  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
773  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
774  }
775 
776  if(USES_LIST(mb_type, 1)){
777  int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my);
778  s->mv_dir |= MV_DIR_BACKWARD;
779 
780  mx = ff_h263_decode_motion(s, mx, 1);
781  my = ff_h263_decode_motion(s, my, 1);
782 
783  s->mv[1][0][0] = mx;
784  s->mv[1][0][1] = my;
785  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
786  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
787  }
788  }
789 
790  s->current_picture.mb_type[xy] = mb_type;
791  } else { /* I-Frame */
792  do{
793  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
794  if (cbpc < 0){
795  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
796  return -1;
797  }
798  }while(cbpc == 8);
799 
800  s->bdsp.clear_blocks(s->block[0]);
801 
802  dquant = cbpc & 4;
803  s->mb_intra = 1;
804 intra:
806  if (s->h263_aic) {
807  s->ac_pred = get_bits1(&s->gb);
808  if(s->ac_pred){
810 
811  s->h263_aic_dir = get_bits1(&s->gb);
812  }
813  }else
814  s->ac_pred = 0;
815 
816  if(s->pb_frame && get_bits1(&s->gb))
817  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
818  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
819  if(cbpy<0){
820  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
821  return -1;
822  }
823  cbp = (cbpc & 3) | (cbpy << 2);
824  if (dquant) {
826  }
827 
828  pb_mv_count += !!s->pb_frame;
829  }
830 
831  while(pb_mv_count--){
832  ff_h263_decode_motion(s, 0, 1);
833  ff_h263_decode_motion(s, 0, 1);
834  }
835 
836  /* decode each block */
837  for (i = 0; i < 6; i++) {
838  if (h263_decode_block(s, block[i], i, cbp&32) < 0)
839  return -1;
840  cbp+=cbp;
841  }
842 
843  if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
844  return -1;
845  if(s->obmc && !s->mb_intra){
846  if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
847  preview_obmc(s);
848  }
849 end:
850 
851  /* per-MB end of slice check */
852  {
853  int v= show_bits(&s->gb, 16);
854 
855  if (get_bits_left(&s->gb) < 16) {
856  v >>= 16 - get_bits_left(&s->gb);
857  }
858 
859  if(v==0)
860  return SLICE_END;
861  }
862 
863  return SLICE_OK;
864 }
865 
866 /* most is hardcoded. should extend to handle all h263 streams */
868 {
869  int format, width, height, i;
870  uint32_t startcode;
871 
872  align_get_bits(&s->gb);
873 
874  startcode= get_bits(&s->gb, 22-8);
875 
876  for(i= get_bits_left(&s->gb); i>24; i-=8) {
877  startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
878 
879  if(startcode == 0x20)
880  break;
881  }
882 
883  if (startcode != 0x20) {
884  av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
885  return -1;
886  }
887  /* temporal reference */
888  i = get_bits(&s->gb, 8); /* picture timestamp */
889  if( (s->picture_number&~0xFF)+i < s->picture_number)
890  i+= 256;
891  s->picture_number= (s->picture_number&~0xFF) + i;
892 
893  /* PTYPE starts here */
894  if (get_bits1(&s->gb) != 1) {
895  /* marker */
896  av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
897  return -1;
898  }
899  if (get_bits1(&s->gb) != 0) {
900  av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
901  return -1; /* h263 id */
902  }
903  skip_bits1(&s->gb); /* split screen off */
904  skip_bits1(&s->gb); /* camera off */
905  skip_bits1(&s->gb); /* freeze picture release off */
906 
907  format = get_bits(&s->gb, 3);
908  /*
909  0 forbidden
910  1 sub-QCIF
911  10 QCIF
912  7 extended PTYPE (PLUSPTYPE)
913  */
914 
915  if (format != 7 && format != 6) {
916  s->h263_plus = 0;
917  /* H.263v1 */
918  width = ff_h263_format[format][0];
919  height = ff_h263_format[format][1];
920  if (!width)
921  return -1;
922 
924 
925  s->h263_long_vectors = get_bits1(&s->gb);
926 
927  if (get_bits1(&s->gb) != 0) {
928  av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n");
929  return -1; /* SAC: off */
930  }
931  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
932  s->unrestricted_mv = s->h263_long_vectors || s->obmc;
933 
934  s->pb_frame = get_bits1(&s->gb);
935  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
936  skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
937 
938  s->width = width;
939  s->height = height;
940  s->avctx->sample_aspect_ratio= (AVRational){12,11};
941  s->avctx->time_base= (AVRational){1001, 30000};
942  } else {
943  int ufep;
944 
945  /* H.263v2 */
946  s->h263_plus = 1;
947  ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
948 
949  /* ufep other than 0 and 1 are reserved */
950  if (ufep == 1) {
951  /* OPPTYPE */
952  format = get_bits(&s->gb, 3);
953  av_dlog(s->avctx, "ufep=1, format: %d\n", format);
954  s->custom_pcf= get_bits1(&s->gb);
955  s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
956  if (get_bits1(&s->gb) != 0) {
957  av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
958  }
959  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
960  s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
961  s->loop_filter= get_bits1(&s->gb);
962  s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
963 
965  if (get_bits1(&s->gb) != 0) {
966  av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
967  }
968  if (get_bits1(&s->gb) != 0) {
969  av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
970  }
971  s->alt_inter_vlc= get_bits1(&s->gb);
972  s->modified_quant= get_bits1(&s->gb);
973  if(s->modified_quant)
975 
976  skip_bits(&s->gb, 1); /* Prevent start code emulation */
977 
978  skip_bits(&s->gb, 3); /* Reserved */
979  } else if (ufep != 0) {
980  av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
981  return -1;
982  }
983 
984  /* MPPTYPE */
985  s->pict_type = get_bits(&s->gb, 3);
986  switch(s->pict_type){
987  case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
988  case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
989  case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
990  case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
991  case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
992  default:
993  return -1;
994  }
995  skip_bits(&s->gb, 2);
996  s->no_rounding = get_bits1(&s->gb);
997  skip_bits(&s->gb, 4);
998 
999  /* Get the picture dimensions */
1000  if (ufep) {
1001  if (format == 6) {
1002  /* Custom Picture Format (CPFMT) */
1003  s->aspect_ratio_info = get_bits(&s->gb, 4);
1004  av_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1005  /* aspect ratios:
1006  0 - forbidden
1007  1 - 1:1
1008  2 - 12:11 (CIF 4:3)
1009  3 - 10:11 (525-type 4:3)
1010  4 - 16:11 (CIF 16:9)
1011  5 - 40:33 (525-type 16:9)
1012  6-14 - reserved
1013  */
1014  width = (get_bits(&s->gb, 9) + 1) * 4;
1015  skip_bits1(&s->gb);
1016  height = get_bits(&s->gb, 9) * 4;
1017  av_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1019  /* aspected dimensions */
1020  s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1021  s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1022  }else{
1024  }
1025  } else {
1026  width = ff_h263_format[format][0];
1027  height = ff_h263_format[format][1];
1028  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1029  }
1030  if ((width == 0) || (height == 0))
1031  return -1;
1032  s->width = width;
1033  s->height = height;
1034 
1035  if(s->custom_pcf){
1036  int gcd;
1037  s->avctx->time_base.den= 1800000;
1038  s->avctx->time_base.num= 1000 + get_bits1(&s->gb);
1039  s->avctx->time_base.num*= get_bits(&s->gb, 7);
1040  if(s->avctx->time_base.num == 0){
1041  av_log(s, AV_LOG_ERROR, "zero framerate\n");
1042  return -1;
1043  }
1044  gcd= av_gcd(s->avctx->time_base.den, s->avctx->time_base.num);
1045  s->avctx->time_base.den /= gcd;
1046  s->avctx->time_base.num /= gcd;
1047  }else{
1048  s->avctx->time_base= (AVRational){1001, 30000};
1049  }
1050  }
1051 
1052  if(s->custom_pcf){
1053  skip_bits(&s->gb, 2); //extended Temporal reference
1054  }
1055 
1056  if (ufep) {
1057  if (s->umvplus) {
1058  if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1059  skip_bits1(&s->gb);
1060  }
1061  if(s->h263_slice_structured){
1062  if (get_bits1(&s->gb) != 0) {
1063  av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1064  }
1065  if (get_bits1(&s->gb) != 0) {
1066  av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1067  }
1068  }
1069  }
1070 
1071  s->qscale = get_bits(&s->gb, 5);
1072  }
1073 
1074  s->mb_width = (s->width + 15) / 16;
1075  s->mb_height = (s->height + 15) / 16;
1076  s->mb_num = s->mb_width * s->mb_height;
1077 
1078  if (s->pb_frame) {
1079  skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1080  if (s->custom_pcf)
1081  skip_bits(&s->gb, 2); //extended Temporal reference
1082  skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1083  }
1084 
1085  if (s->pict_type!=AV_PICTURE_TYPE_B) {
1086  s->time = s->picture_number;
1087  s->pp_time = s->time - s->last_non_b_time;
1088  s->last_non_b_time = s->time;
1089  }else{
1090  s->time = s->picture_number;
1091  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1092  if (s->pp_time <=s->pb_time ||
1093  s->pp_time <= s->pp_time - s->pb_time ||
1094  s->pp_time <= 0){
1095  s->pp_time = 2;
1096  s->pb_time = 1;
1097  }
1099  }
1100 
1101  /* PEI */
1102  while (get_bits1(&s->gb) != 0) {
1103  skip_bits(&s->gb, 8);
1104  }
1105 
1106  if(s->h263_slice_structured){
1107  if (get_bits1(&s->gb) != 1) {
1108  av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n");
1109  return -1;
1110  }
1111 
1112  ff_h263_decode_mba(s);
1113 
1114  if (get_bits1(&s->gb) != 1) {
1115  av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n");
1116  return -1;
1117  }
1118  }
1119  s->f_code = 1;
1120 
1121  if(s->h263_aic){
1122  s->y_dc_scale_table=
1124  }else{
1125  s->y_dc_scale_table=
1127  }
1128 
1130  if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO")){
1131  int i,j;
1132  for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1133  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1134  for(i=0; i<13; i++){
1135  for(j=0; j<3; j++){
1136  int v= get_bits(&s->gb, 8);
1137  v |= get_sbits(&s->gb, 8)<<8;
1138  av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1139  }
1140  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1141  }
1142  for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1143  }
1144 
1145  return 0;
1146 }
av_cold void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:102
int rv10_first_dc_coded[3]
Definition: mpegvideo.h:534
int last
number of values for last = 0
Definition: rl.h:40
#define MB_TYPE_SKIP
Definition: avcodec.h:786
int aspect_ratio_info
Definition: mpegvideo.h:515
int picture_number
Definition: mpegvideo.h:253
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
ScanTable intra_v_scantable
Definition: mpegvideo.h:216
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:152
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:93
#define CBPY_VLC_BITS
Definition: h263.h:39
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:314
void(* clear_block)(int16_t *block)
Definition: blockdsp.h:35
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
RLTable ff_h263_rl_inter
Definition: h263data.h:162
#define CONFIG_FLV_DECODER
Definition: config.h:490
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
#define MB_TYPE_INTRA4x4
Definition: avcodec.h:775
enum AVCodecID codec_id
Definition: mpegvideo.h:235
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
int obmc
overlapped block motion compensation
Definition: mpegvideo.h:483
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:1429
#define MB_TYPE_INTRA
Definition: mpegutils.h:69
static int h263_decode_block(MpegEncContext *s, int16_t *block, int n, int coded)
Definition: ituh263dec.c:439
#define MB_TYPE_QUANT
Definition: avcodec.h:794
#define AV_EF_BITSTREAM
Definition: avcodec.h:2415
mpegvideo header.
#define HAS_CBP(a)
Definition: mpegutils.h:97
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1237
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: idctdsp.h:31
const int8_t * table_level
Definition: rl.h:43
uint8_t run
Definition: svq3.c:146
const uint16_t ff_h263_format[8][2]
Definition: h263data.h:239
#define SLICE_OK
Definition: mpegvideo.h:603
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:259
int stride
Definition: mace.c:144
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:332
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:226
int h263_aic
Advanded INTRA Coding (AIC)
Definition: mpegvideo.h:210
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:313
Macro definitions for various function/variable attributes.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1175
int modified_quant
Definition: mpegvideo.h:494
uint8_t ff_mba_length[7]
Definition: h263data.h:271
#define USES_LIST(a, list)
Definition: mpegutils.h:95
int alt_inter_vlc
alternative inter vlc
Definition: mpegvideo.h:493
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:475
int64_t time
time of current frame
Definition: mpegvideo.h:503
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:386
uint8_t
#define av_cold
Definition: attributes.h:66
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:443
const uint8_t ff_h263_intra_MCBPC_bits[9]
Definition: h263data.h:37
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2363
const uint8_t ff_mvtab[33][2]
Definition: h263data.h:91
static VLC h263_mbtype_b_vlc
Definition: ituh263dec.c:96
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:406
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:306
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:474
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
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:505
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:255
static int h263_skip_b_part(MpegEncContext *s, int cbp)
Definition: ituh263dec.c:562
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:245
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.h:275
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2459
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:555
#define H263_MBTYPE_B_VLC_BITS
Definition: ituh263dec.c:49
int h263_plus
h263 plus headers
Definition: mpegvideo.h:232
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:311
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:321
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:348
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:270
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:144
static const int h263_mb_type_b_map[15]
Definition: ituh263dec.c:52
int h263_slice_structured
Definition: mpegvideo.h:492
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:38
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:169
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:81
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
Definition: ituh263dec.c:581
#define CONFIG_MPEG4_DECODER
Definition: config.h:527
GetBitContext gb
Definition: mpegvideo.h:558
VLC vlc
decoding only deprecated FIXME remove
Definition: rl.h:47
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:59
Definition: get_bits.h:64
common internal API header
int n
number of entries of table_vlc minus 1
Definition: rl.h:39
int err_recognition
Definition: mpegvideo.h:477
#define MB_TYPE_DIRECT2
Definition: avcodec.h:783
#define IS_DIRECT(a)
Definition: mpegutils.h:80
int umvplus
== H263+ && unrestricted_mv
Definition: mpegvideo.h:490
int16_t(*[2] motion_val)[2]
Definition: mpegvideo.h:107
int size_in_bits
Definition: get_bits.h:56
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:254
const int8_t * table_run
Definition: rl.h:42
#define MB_TYPE_L0L1
Definition: avcodec.h:793
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:522
#define AV_RL32
Definition: intreadwrite.h:146
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:209
int pb_frame
PB frame mode (0 = none, 1 = base, 2 = improved)
Definition: mpegvideo.h:229
#define MB_TYPE_ACPRED
Definition: avcodec.h:784
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:94
#define MB_TYPE_L1
Definition: avcodec.h:792
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.h:248
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:134
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:308
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:415
static const float pred[4]
Definition: siprdata.h:259
static const int8_t mv[256][2]
Definition: 4xm.c:75
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:388
#define MV_VLC_BITS
Definition: ituh263dec.c:48
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:385
static int width
Definition: utils.c:156
int64_t last_non_b_time
Definition: mpegvideo.h:504
Libavcodec external API header.
int h263_flv
use flv h263 header
Definition: mpegvideo.h:233
BlockDSPContext bdsp
Definition: mpegvideo.h:351
uint8_t ff_h263_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: h263.c:43
int debug
debug
Definition: avcodec.h:2362
ScanTable intra_scantable
Definition: mpegvideo.h:214
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:223
#define IS_QUANT(a)
Definition: mpegutils.h:91
const uint8_t ff_mpeg1_dc_scale_table[128]
Definition: mpegvideo.c:55
#define SLICE_END
end marker found
Definition: mpegvideo.h:605
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:92
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:296
ScanTable intra_h_scantable
Definition: mpegvideo.h:215
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:263
rational number numerator/denominator
Definition: rational.h:43
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:209
#define CBPC_B_VLC_BITS
Definition: ituh263dec.c:50
#define MB_TYPE_16x16
Definition: avcodec.h:778
static VLC mv_vlc
Definition: ituh263dec.c:95
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:228
int f_code
forward MV resolution
Definition: mpegvideo.h:362
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:127
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:867
#define MV_DIR_FORWARD
Definition: mpegvideo.h:384
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:339
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:127
static void h263_decode_dquant(MpegEncContext *s)
Definition: ituh263dec.c:426
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:228
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:315
uint8_t level
Definition: svq3.c:147
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:398
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:257
int height
Definition: gxfenc.c:72
MpegEncContext.
Definition: mpegvideo.h:204
struct AVCodecContext * avctx
Definition: mpegvideo.h:221
#define MB_TYPE_CBP
Definition: avcodec.h:795
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:256
void ff_h263_pred_acdc(MpegEncContext *s, int16_t *block, int n)
Definition: h263.c:226
#define TEX_VLC_BITS
Definition: dv.h:97
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
#define MB_TYPE_8x8
Definition: avcodec.h:781
#define restrict
Definition: config.h:8
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:194
Bi-dir predicted.
Definition: avutil.h:255
int den
denominator
Definition: rational.h:45
const uint8_t * chroma_qscale_table
qscale -> chroma_qscale (h263)
Definition: mpegvideo.h:316
#define IS_INTRA(x, y)
void * priv_data
Definition: avcodec.h:1092
static VLC cbpc_b_vlc
Definition: ituh263dec.c:97
void ff_h263_show_pict_info(MpegEncContext *s)
Print picture info if FF_DEBUG_PICT_INFO is set.
Definition: ituh263dec.c:70
av_cold void ff_init_rl(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: mpegvideo.c:1528
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:600
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:416
int chroma_qscale
chroma QP
Definition: mpegvideo.h:333
static void preview_obmc(MpegEncContext *s)
read the next MVs for OBMC.
Definition: ituh263dec.c:334
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegvideo.h:110
#define LOCAL_ALIGNED_16(t, v,...)
Definition: internal.h:114
int rv10_version
RV10 version: 0 or 3.
Definition: mpegvideo.h:533
int h263_long_vectors
use horrible h263v1 long vector mode
Definition: mpegvideo.h:349
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:389
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:491
void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last)
Definition: flvdec.c:25
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:599
#define MB_TYPE_L0
Definition: avcodec.h:791
Predicted.
Definition: avutil.h:254
uint16_t ff_mba_max[6]
Definition: h263data.h:267
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:37
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:506
static int16_t block[64]
Definition: dct-test.c:88