Libav
ituh263dec.c
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1 /*
2  * ITU H.263 bitstream decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * H.263+ 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/imgutils.h"
34 #include "libavutil/internal.h"
35 #include "libavutil/mathematics.h"
36 #include "avcodec.h"
37 #include "mpegvideo.h"
38 #include "h263.h"
39 #include "h263data.h"
40 #include "internal.h"
41 #include "mathops.h"
42 #include "mpegutils.h"
43 #include "unary.h"
44 #include "flv.h"
45 #include "rv10.h"
46 #include "mpeg4video.h"
47 #include "mpegvideodata.h"
48 
49 // The defines below define the number of bits that are read at once for
50 // reading vlc values. Changing these may improve speed and data cache needs
51 // be aware though that decreasing them may need the number of stages that is
52 // passed to get_vlc* to be increased.
53 #define MV_VLC_BITS 9
54 #define H263_MBTYPE_B_VLC_BITS 6
55 #define CBPC_B_VLC_BITS 3
56 
57 static const int h263_mb_type_b_map[15]= {
70  0, //stuffing
73 };
74 
77  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",
79  s->gb.size_in_bits, 1-s->no_rounding,
80  s->obmc ? " AP" : "",
81  s->umvplus ? " UMV" : "",
82  s->h263_long_vectors ? " LONG" : "",
83  s->h263_plus ? " +" : "",
84  s->h263_aic ? " AIC" : "",
85  s->alt_inter_vlc ? " AIV" : "",
86  s->modified_quant ? " MQ" : "",
87  s->loop_filter ? " LOOP" : "",
88  s->h263_slice_structured ? " SS" : "",
90  );
91  }
92 }
93 
94 /***********************************************/
95 /* decoding */
96 
100 static VLC mv_vlc;
103 
104 /* init vlcs */
105 
106 /* XXX: find a better solution to handle static init */
108 {
109  static int done = 0;
110 
111  if (!done) {
112  done = 1;
113 
114  INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
116  ff_h263_intra_MCBPC_code, 1, 1, 72);
117  INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
119  ff_h263_inter_MCBPC_code, 1, 1, 198);
120  INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
121  &ff_h263_cbpy_tab[0][1], 2, 1,
122  &ff_h263_cbpy_tab[0][0], 2, 1, 64);
123  INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
124  &ff_mvtab[0][1], 2, 1,
125  &ff_mvtab[0][0], 2, 1, 538);
130  INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
131  &ff_h263_mbtype_b_tab[0][1], 2, 1,
132  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
133  INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
134  &ff_cbpc_b_tab[0][1], 2, 1,
135  &ff_cbpc_b_tab[0][0], 2, 1, 8);
136  }
137 }
138 
140 {
141  int i, mb_pos;
142 
143  for (i = 0; i < 6; i++)
144  if (s->mb_num - 1 <= ff_mba_max[i])
145  break;
146  mb_pos = get_bits(&s->gb, ff_mba_length[i]);
147  s->mb_x = mb_pos % s->mb_width;
148  s->mb_y = mb_pos / s->mb_width;
149 
150  return mb_pos;
151 }
152 
158 {
159  unsigned int val, gob_number;
160  int left;
161 
162  /* Check for GOB Start Code */
163  val = show_bits(&s->gb, 16);
164  if(val)
165  return -1;
166 
167  /* We have a GBSC probably with GSTUFF */
168  skip_bits(&s->gb, 16); /* Drop the zeros */
169  left= get_bits_left(&s->gb);
170  //MN: we must check the bits left or we might end in a infinite loop (or segfault)
171  for(;left>13; left--){
172  if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
173  }
174  if(left<=13)
175  return -1;
176 
177  if(s->h263_slice_structured){
178  if(get_bits1(&s->gb)==0)
179  return -1;
180 
182 
183  if(s->mb_num > 1583)
184  if(get_bits1(&s->gb)==0)
185  return -1;
186 
187  s->qscale = get_bits(&s->gb, 5); /* SQUANT */
188  if(get_bits1(&s->gb)==0)
189  return -1;
190  skip_bits(&s->gb, 2); /* GFID */
191  }else{
192  gob_number = get_bits(&s->gb, 5); /* GN */
193  s->mb_x= 0;
194  s->mb_y= s->gob_index* gob_number;
195  skip_bits(&s->gb, 2); /* GFID */
196  s->qscale = get_bits(&s->gb, 5); /* GQUANT */
197  }
198 
199  if(s->mb_y >= s->mb_height)
200  return -1;
201 
202  if(s->qscale==0)
203  return -1;
204 
205  return 0;
206 }
207 
215 {
216  assert(p < end);
217 
218  end-=2;
219  p++;
220  for(;p<end; p+=2){
221  if(!*p){
222  if (!p[-1] && p[1]) return p - 1;
223  else if(!p[ 1] && p[2]) return p;
224  }
225  }
226  return end+2;
227 }
228 
234  int left, pos, ret;
235 
236  if(s->codec_id==AV_CODEC_ID_MPEG4){
237  skip_bits1(&s->gb);
238  align_get_bits(&s->gb);
239  }
240 
241  if(show_bits(&s->gb, 16)==0){
242  pos= get_bits_count(&s->gb);
245  else
246  ret= h263_decode_gob_header(s);
247  if(ret>=0)
248  return pos;
249  }
250  //OK, it's not where it is supposed to be ...
251  s->gb= s->last_resync_gb;
252  align_get_bits(&s->gb);
253  left= get_bits_left(&s->gb);
254 
255  for(;left>16+1+5+5; left-=8){
256  if(show_bits(&s->gb, 16)==0){
257  GetBitContext bak= s->gb;
258 
259  pos= get_bits_count(&s->gb);
262  else
263  ret= h263_decode_gob_header(s);
264  if(ret>=0)
265  return pos;
266 
267  s->gb= bak;
268  }
269  skip_bits(&s->gb, 8);
270  }
271 
272  return -1;
273 }
274 
275 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
276 {
277  int code, val, sign, shift;
278  code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
279 
280  if (code == 0)
281  return pred;
282  if (code < 0)
283  return 0xffff;
284 
285  sign = get_bits1(&s->gb);
286  shift = f_code - 1;
287  val = code;
288  if (shift) {
289  val = (val - 1) << shift;
290  val |= get_bits(&s->gb, shift);
291  val++;
292  }
293  if (sign)
294  val = -val;
295  val += pred;
296 
297  /* modulo decoding */
298  if (!s->h263_long_vectors) {
299  val = sign_extend(val, 5 + f_code);
300  } else {
301  /* horrible H.263 long vector mode */
302  if (pred < -31 && val < -63)
303  val += 64;
304  if (pred > 32 && val > 63)
305  val -= 64;
306 
307  }
308  return val;
309 }
310 
311 
312 /* Decode RVLC of H.263+ UMV */
314 {
315  int code = 0, sign;
316 
317  if (get_bits1(&s->gb)) /* Motion difference = 0 */
318  return pred;
319 
320  code = 2 + get_bits1(&s->gb);
321 
322  while (get_bits1(&s->gb))
323  {
324  code <<= 1;
325  code += get_bits1(&s->gb);
326  }
327  sign = code & 1;
328  code >>= 1;
329 
330  code = (sign) ? (pred - code) : (pred + code);
331  ff_dlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
332  return code;
333 
334 }
335 
339 static void preview_obmc(MpegEncContext *s){
340  GetBitContext gb= s->gb;
341 
342  int cbpc, i, pred_x, pred_y, mx, my;
343  int16_t *mot_val;
344  const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
345  const int stride= s->b8_stride*2;
346 
347  for(i=0; i<4; i++)
348  s->block_index[i]+= 2;
349  for(i=4; i<6; i++)
350  s->block_index[i]+= 1;
351  s->mb_x++;
352 
353  assert(s->pict_type == AV_PICTURE_TYPE_P);
354 
355  do{
356  if (get_bits1(&s->gb)) {
357  /* skip mb */
358  mot_val = s->current_picture.motion_val[0][s->block_index[0]];
359  mot_val[0 ]= mot_val[2 ]=
360  mot_val[0+stride]= mot_val[2+stride]= 0;
361  mot_val[1 ]= mot_val[3 ]=
362  mot_val[1+stride]= mot_val[3+stride]= 0;
363 
365  goto end;
366  }
367  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
368  }while(cbpc == 20);
369 
370  if(cbpc & 4){
372  }else{
373  get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
374  if (cbpc & 8) {
375  if(s->modified_quant){
376  if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
377  else skip_bits(&s->gb, 5);
378  }else
379  skip_bits(&s->gb, 2);
380  }
381 
382  if ((cbpc & 16) == 0) {
384  /* 16x16 motion prediction */
385  mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
386  if (s->umvplus)
387  mx = h263p_decode_umotion(s, pred_x);
388  else
389  mx = ff_h263_decode_motion(s, pred_x, 1);
390 
391  if (s->umvplus)
392  my = h263p_decode_umotion(s, pred_y);
393  else
394  my = ff_h263_decode_motion(s, pred_y, 1);
395 
396  mot_val[0 ]= mot_val[2 ]=
397  mot_val[0+stride]= mot_val[2+stride]= mx;
398  mot_val[1 ]= mot_val[3 ]=
399  mot_val[1+stride]= mot_val[3+stride]= my;
400  } else {
402  for(i=0;i<4;i++) {
403  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
404  if (s->umvplus)
405  mx = h263p_decode_umotion(s, pred_x);
406  else
407  mx = ff_h263_decode_motion(s, pred_x, 1);
408 
409  if (s->umvplus)
410  my = h263p_decode_umotion(s, pred_y);
411  else
412  my = ff_h263_decode_motion(s, pred_y, 1);
413  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
414  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
415  mot_val[0] = mx;
416  mot_val[1] = my;
417  }
418  }
419  }
420 end:
421 
422  for(i=0; i<4; i++)
423  s->block_index[i]-= 2;
424  for(i=4; i<6; i++)
425  s->block_index[i]-= 1;
426  s->mb_x--;
427 
428  s->gb= gb;
429 }
430 
432  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
433 
434  if(s->modified_quant){
435  if(get_bits1(&s->gb))
437  else
438  s->qscale= get_bits(&s->gb, 5);
439  }else
440  s->qscale += quant_tab[get_bits(&s->gb, 2)];
441  ff_set_qscale(s, s->qscale);
442 }
443 
444 static int h263_decode_block(MpegEncContext * s, int16_t * block,
445  int n, int coded)
446 {
447  int code, level, i, j, last, run;
448  RLTable *rl = &ff_h263_rl_inter;
449  const uint8_t *scan_table;
450  GetBitContext gb= s->gb;
451 
452  scan_table = s->intra_scantable.permutated;
453  if (s->h263_aic && s->mb_intra) {
454  rl = &ff_rl_intra_aic;
455  i = 0;
456  if (s->ac_pred) {
457  if (s->h263_aic_dir)
458  scan_table = s->intra_v_scantable.permutated; /* left */
459  else
460  scan_table = s->intra_h_scantable.permutated; /* top */
461  }
462  } else if (s->mb_intra) {
463  /* DC coef */
465  if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
466  int component, diff;
467  component = (n <= 3 ? 0 : n - 4 + 1);
468  level = s->last_dc[component];
469  if (s->rv10_first_dc_coded[component]) {
470  diff = ff_rv_decode_dc(s, n);
471  if (diff == 0xffff)
472  return -1;
473  level += diff;
474  level = level & 0xff; /* handle wrap round */
475  s->last_dc[component] = level;
476  } else {
477  s->rv10_first_dc_coded[component] = 1;
478  }
479  } else {
480  level = get_bits(&s->gb, 8);
481  if (level == 255)
482  level = 128;
483  }
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->bdsp.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(int16_t, 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  int16_t 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->bdsp.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.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
708  int16_t *mot_val1 = s->current_picture.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->bdsp.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.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->bdsp.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 H.263 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;
894  s->picture_number= (s->picture_number&~0xFF) + i;
895 
896  /* PTYPE starts here */
897  if (get_bits1(&s->gb) != 1) {
898  /* marker */
899  av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
900  return -1;
901  }
902  if (get_bits1(&s->gb) != 0) {
903  av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
904  return -1; /* H.263 id */
905  }
906  skip_bits1(&s->gb); /* split screen off */
907  skip_bits1(&s->gb); /* camera off */
908  skip_bits1(&s->gb); /* freeze picture release off */
909 
910  format = get_bits(&s->gb, 3);
911  /*
912  0 forbidden
913  1 sub-QCIF
914  10 QCIF
915  7 extended PTYPE (PLUSPTYPE)
916  */
917 
918  if (format != 7 && format != 6) {
919  s->h263_plus = 0;
920  /* H.263v1 */
921  width = ff_h263_format[format][0];
922  height = ff_h263_format[format][1];
923 
925 
926  s->h263_long_vectors = get_bits1(&s->gb);
927 
928  if (get_bits1(&s->gb) != 0) {
929  av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
930  return -1; /* SAC: off */
931  }
932  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
933  s->unrestricted_mv = s->h263_long_vectors || s->obmc;
934 
935  s->pb_frame = get_bits1(&s->gb);
936  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
937  skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
938 
939  s->width = width;
940  s->height = height;
941  s->avctx->sample_aspect_ratio= (AVRational){12,11};
942  s->avctx->framerate = (AVRational){ 30000, 1001 };
943  } else {
944  int ufep;
945 
946  /* H.263v2 */
947  s->h263_plus = 1;
948  ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
949 
950  /* ufep other than 0 and 1 are reserved */
951  if (ufep == 1) {
952  /* OPPTYPE */
953  format = get_bits(&s->gb, 3);
954  ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
955  s->custom_pcf= get_bits1(&s->gb);
956  s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
957  if (get_bits1(&s->gb) != 0) {
958  av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
959  }
960  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
961  s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
962  s->loop_filter= get_bits1(&s->gb);
963  s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
964 
966  if (get_bits1(&s->gb) != 0) {
967  av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
968  }
969  if (get_bits1(&s->gb) != 0) {
970  av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
971  }
972  s->alt_inter_vlc= get_bits1(&s->gb);
973  s->modified_quant= get_bits1(&s->gb);
974  if(s->modified_quant)
976 
977  skip_bits(&s->gb, 1); /* Prevent start code emulation */
978 
979  skip_bits(&s->gb, 3); /* Reserved */
980  } else if (ufep != 0) {
981  av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
982  return -1;
983  }
984 
985  /* MPPTYPE */
986  s->pict_type = get_bits(&s->gb, 3);
987  switch(s->pict_type){
988  case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
989  case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
990  case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
991  case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
992  case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
993  default:
994  return -1;
995  }
996  skip_bits(&s->gb, 2);
997  s->no_rounding = get_bits1(&s->gb);
998  skip_bits(&s->gb, 4);
999 
1000  /* Get the picture dimensions */
1001  if (ufep) {
1002  if (format == 6) {
1003  /* Custom Picture Format (CPFMT) */
1004  s->aspect_ratio_info = get_bits(&s->gb, 4);
1005  ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1006  /* aspect ratios:
1007  0 - forbidden
1008  1 - 1:1
1009  2 - 12:11 (CIF 4:3)
1010  3 - 10:11 (525-type 4:3)
1011  4 - 16:11 (CIF 16:9)
1012  5 - 40:33 (525-type 16:9)
1013  6-14 - reserved
1014  */
1015  width = (get_bits(&s->gb, 9) + 1) * 4;
1016  skip_bits1(&s->gb);
1017  height = get_bits(&s->gb, 9) * 4;
1018  ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1020  /* expected dimensions */
1021  s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1022  s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1023  }else{
1025  }
1026  } else {
1027  width = ff_h263_format[format][0];
1028  height = ff_h263_format[format][1];
1029  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1030  }
1031  if ((width == 0) || (height == 0))
1032  return -1;
1033  s->width = width;
1034  s->height = height;
1035 
1036  if(s->custom_pcf){
1037  int gcd;
1038  s->avctx->framerate.num = 1800000;
1039  s->avctx->framerate.den = 1000 + get_bits1(&s->gb);
1040  s->avctx->framerate.den *= get_bits(&s->gb, 7);
1041  if(s->avctx->framerate.den == 0){
1042  av_log(s, AV_LOG_ERROR, "zero framerate\n");
1043  return -1;
1044  }
1045  gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1046  s->avctx->framerate.den /= gcd;
1047  s->avctx->framerate.num /= gcd;
1048  }else{
1049  s->avctx->framerate = (AVRational){ 30000, 1001 };
1050  }
1051  }
1052 
1053  if(s->custom_pcf){
1054  skip_bits(&s->gb, 2); //extended Temporal reference
1055  }
1056 
1057  if (ufep) {
1058  if (s->umvplus) {
1059  if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1060  skip_bits1(&s->gb);
1061  }
1062  if(s->h263_slice_structured){
1063  if (get_bits1(&s->gb) != 0) {
1064  av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1065  }
1066  if (get_bits1(&s->gb) != 0) {
1067  av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1068  }
1069  }
1070  }
1071 
1072  s->qscale = get_bits(&s->gb, 5);
1073  }
1074 
1075  if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1076  return ret;
1077 
1078  s->mb_width = (s->width + 15) / 16;
1079  s->mb_height = (s->height + 15) / 16;
1080  s->mb_num = s->mb_width * s->mb_height;
1081 
1082  if (s->pb_frame) {
1083  skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1084  if (s->custom_pcf)
1085  skip_bits(&s->gb, 2); //extended Temporal reference
1086  skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1087  }
1088 
1089  if (s->pict_type!=AV_PICTURE_TYPE_B) {
1090  s->time = s->picture_number;
1091  s->pp_time = s->time - s->last_non_b_time;
1092  s->last_non_b_time = s->time;
1093  }else{
1094  s->time = s->picture_number;
1095  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1096  if (s->pp_time <=s->pb_time ||
1097  s->pp_time <= s->pp_time - s->pb_time ||
1098  s->pp_time <= 0){
1099  s->pp_time = 2;
1100  s->pb_time = 1;
1101  }
1103  }
1104 
1105  /* PEI */
1106  while (get_bits1(&s->gb) != 0) {
1107  skip_bits(&s->gb, 8);
1108  }
1109 
1110  if(s->h263_slice_structured){
1111  if (get_bits1(&s->gb) != 1) {
1112  av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n");
1113  return -1;
1114  }
1115 
1116  ff_h263_decode_mba(s);
1117 
1118  if (get_bits1(&s->gb) != 1) {
1119  av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n");
1120  return -1;
1121  }
1122  }
1123  s->f_code = 1;
1124 
1125  if(s->h263_aic){
1126  s->y_dc_scale_table=
1128  }else{
1129  s->y_dc_scale_table=
1131  }
1132 
1134  if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO")){
1135  int i,j;
1136  for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1137  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1138  for(i=0; i<13; i++){
1139  for(j=0; j<3; j++){
1140  int v= get_bits(&s->gb, 8);
1141  v |= get_sbits(&s->gb, 8)<<8;
1142  av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1143  }
1144  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1145  }
1146  for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1147  }
1148 
1149  return 0;
1150 }
av_cold void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:107
int rv10_first_dc_coded[3]
Definition: mpegvideo.h:406
int last
number of values for last = 0
Definition: rl.h:41
AVRational framerate
Definition: avcodec.h:3063
#define MB_TYPE_SKIP
Definition: avcodec.h:1093
int aspect_ratio_info
Definition: mpegvideo.h:387
int picture_number
Definition: mpegvideo.h:122
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
ScanTable intra_v_scantable
Definition: mpegvideo.h:88
static int h263_decode_gob_header(MpegEncContext *s)
Decode the group of blocks header or slice header.
Definition: ituh263dec.c:157
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:98
#define CBPY_VLC_BITS
Definition: h263.h:41
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:183
uint16_t ff_mba_max[6]
Definition: h263data.c:267
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:228
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:57
void(* clear_block)(int16_t *block)
Definition: blockdsp.h:35
RLTable ff_rl_intra_aic
Definition: h263data.c:230
int num
numerator
Definition: rational.h:44
#define MB_TYPE_INTRA4x4
Definition: avcodec.h:1082
enum AVCodecID codec_id
Definition: mpegvideo.h:107
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, 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)
int obmc
overlapped block motion compensation
Definition: mpegvideo.h:354
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:1804
#define MB_TYPE_INTRA
Definition: mpegutils.h:75
static int h263_decode_block(MpegEncContext *s, int16_t *block, int n, int coded)
Definition: ituh263dec.c:444
#define MB_TYPE_QUANT
Definition: avcodec.h:1101
#define AV_EF_BITSTREAM
Definition: avcodec.h:2679
mpegvideo header.
#define HAS_CBP(a)
Definition: mpegutils.h:103
const uint16_t ff_h263_format[8][2]
Definition: h263data.c:238
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1598
uint8_t permutated[64]
Definition: idctdsp.h:31
const int8_t * table_level
Definition: rl.h:44
uint8_t run
Definition: svq3.c:203
#define SLICE_OK
Definition: mpegvideo.h:479
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:128
int stride
Definition: mace.c:144
RLTable.
Definition: rl.h:39
int qscale
QP.
Definition: mpegvideo.h:199
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:214
int h263_aic
Advanced INTRA Coding (AIC)
Definition: mpegvideo.h:82
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:309
Macro definitions for various function/variable attributes.
int modified_quant
Definition: mpegvideo.h:366
static int16_t block[64]
Definition: dct.c:97
#define USES_LIST(a, list)
Definition: mpegutils.h:101
int alt_inter_vlc
alternative inter vlc
Definition: mpegvideo.h:365
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:347
int64_t time
time of current frame
Definition: mpegvideo.h:375
const uint8_t ff_mpeg1_dc_scale_table[128]
Definition: mpegvideodata.c:27
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4) ...
Definition: mpegvideo.h:258
uint8_t
#define av_cold
Definition: attributes.h:66
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2627
static VLC h263_mbtype_b_vlc
Definition: ituh263dec.c:101
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:198
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:278
H.263 tables.
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:175
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:346
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:182
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:50
const uint8_t ff_h263_intra_MCBPC_bits[9]
Definition: h263data.c:35
uint16_t pp_time
time distance between the last 2 p,s,i frames
Definition: mpegvideo.h:377
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:124
static int h263_skip_b_part(MpegEncContext *s, int cbp)
Definition: ituh263dec.c:565
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:115
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:1806
const uint8_t ff_h263_mbtype_b_tab[15][2]
Definition: h263data.c:59
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:526
#define H263_MBTYPE_B_VLC_BITS
Definition: ituh263dec.c:54
int h263_plus
H.263+ headers.
Definition: mpegvideo.h:104
uint8_t ff_h263_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: h263data.c:31
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:180
const uint8_t ff_h263_inter_MCBPC_code[28]
Definition: h263data.c:40
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:190
const uint8_t ff_modified_quant_tab[2][32]
Definition: h263data.c:252
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:215
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:275
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:145
static const int h263_mb_type_b_map[15]
Definition: ituh263dec.c:57
int h263_slice_structured
Definition: mpegvideo.h:364
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
int64_t av_gcd(int64_t a, int64_t b)
Return the greatest common divisor of a and b.
Definition: mathematics.c:32
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:71
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:584
GetBitContext gb
Definition: mpegvideo.h:431
VLC vlc
decoding only deprecated FIXME remove
Definition: rl.h:48
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:64
Definition: vlc.h:26
common internal API header
int n
number of entries of table_vlc minus 1
Definition: rl.h:40
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:223
const uint8_t ff_h263_inter_MCBPC_bits[28]
Definition: h263data.c:49
#define CONFIG_MPEG4_DECODER
Definition: config.h:624
const uint8_t ff_h263_chroma_qscale_table[32]
Definition: h263data.c:262
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2670
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1090
#define IS_DIRECT(a)
Definition: mpegutils.h:86
int umvplus
== H.263+ && unrestricted_mv
Definition: mpegvideo.h:362
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
int size_in_bits
Definition: get_bits.h:57
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:250
const int8_t * table_run
Definition: rl.h:43
#define MB_TYPE_L0L1
Definition: avcodec.h:1100
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:493
#define AV_RL32
Definition: intreadwrite.h:146
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:81
int pb_frame
PB-frame mode (0 = none, 1 = base, 2 = improved)
Definition: mpegvideo.h:101
#define MB_TYPE_ACPRED
Definition: avcodec.h:1091
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:99
#define MB_TYPE_L1
Definition: avcodec.h:1099
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:139
static int h263p_decode_umotion(MpegEncContext *s, int pred)
Definition: ituh263dec.c:313
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:287
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:260
#define MV_VLC_BITS
Definition: ituh263dec.c:53
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.c:247
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:257
static int width
Definition: utils.c:156
int64_t last_non_b_time
Definition: mpegvideo.h:376
Libavcodec external API header.
#define ff_dlog(ctx,...)
Definition: internal.h:60
int h263_flv
use flv H.263 header
Definition: mpegvideo.h:105
BlockDSPContext bdsp
Definition: mpegvideo.h:218
int debug
debug
Definition: avcodec.h:2626
const uint8_t ff_h263_intra_MCBPC_code[9]
Definition: h263data.c:34
ScanTable intra_scantable
Definition: mpegvideo.h:86
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:95
#define IS_QUANT(a)
Definition: mpegutils.h:97
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:38
#define SLICE_END
end marker found
Definition: mpegvideo.h:481
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:97
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:267
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:292
const char * format
Definition: movenc.c:47
ScanTable intra_h_scantable
Definition: mpegvideo.h:87
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:259
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:214
#define CBPC_B_VLC_BITS
Definition: ituh263dec.c:55
#define MB_TYPE_16x16
Definition: avcodec.h:1085
RLTable ff_h263_rl_inter
Definition: h263data.c:161
#define CONFIG_FLV_DECODER
Definition: config.h:578
static VLC mv_vlc
Definition: ituh263dec.c:100
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:233
uint8_t ff_mba_length[7]
Definition: h263data.c:271
const uint8_t ff_cbpc_b_tab[4][2]
Definition: h263data.c:77
int f_code
forward MV resolution
Definition: mpegvideo.h:229
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
const uint8_t ff_h263_cbpy_tab[16][2]
Definition: h263data.c:84
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:870
#define MV_DIR_FORWARD
Definition: mpegvideo.h:256
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:206
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:118
static void h263_decode_dquant(MpegEncContext *s)
Definition: ituh263dec.c:431
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:100
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:184
uint8_t level
Definition: svq3.c:204
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:270
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:126
int height
Definition: gxfenc.c:72
MpegEncContext.
Definition: mpegvideo.h:76
struct AVCodecContext * avctx
Definition: mpegvideo.h:93
#define MB_TYPE_CBP
Definition: avcodec.h:1102
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:125
void ff_h263_pred_acdc(MpegEncContext *s, int16_t *block, int n)
Definition: h263.c:222
#define TEX_VLC_BITS
Definition: dv.h:97
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:1088
Bi-dir predicted.
Definition: avutil.h:262
int den
denominator
Definition: rational.h:45
#define CONFIG_RV10_DECODER
Definition: config.h:660
const uint8_t * chroma_qscale_table
qscale -> chroma_qscale (H.263)
Definition: mpegvideo.h:185
#define IS_INTRA(x, y)
void * priv_data
Definition: avcodec.h:1451
static VLC cbpc_b_vlc
Definition: ituh263dec.c:102
void ff_h263_show_pict_info(MpegEncContext *s)
Print picture info if FF_DEBUG_PICT_INFO is set.
Definition: ituh263dec.c:75
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:476
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:403
#define restrict
Definition: config.h:8
int chroma_qscale
chroma QP
Definition: mpegvideo.h:200
static void preview_obmc(MpegEncContext *s)
read the next MVs for OBMC.
Definition: ituh263dec.c:339
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
#define LOCAL_ALIGNED_16(t, v,...)
Definition: internal.h:111
int rv10_version
RV10 version: 0 or 3.
Definition: mpegvideo.h:405
int h263_long_vectors
use horrible H.263v1 long vector mode
Definition: mpegvideo.h:216
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:261
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:363
void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last)
Definition: flvdec.c:28
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:602
#define MB_TYPE_L0
Definition: avcodec.h:1098
Predicted.
Definition: avutil.h:261
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:39
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:378
const uint8_t ff_mvtab[33][2]
Definition: h263data.c:90