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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 FFmpeg.
9  *
10  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 /**
26  * @file
27  * h263 decoder.
28  */
29 
30 #define UNCHECKED_BITSTREAM_READER 1
31 #include <limits.h>
32 
33 #include "libavutil/attributes.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 "internal.h"
40 #include "mathops.h"
41 #include "mpegutils.h"
42 #include "unary.h"
43 #include "flv.h"
44 #include "mpeg4video.h"
45 #include "mpegvideodata.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 volatile int done = 0;
108 
109  if (!done) {
110  INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
112  ff_h263_intra_MCBPC_code, 1, 1, 72);
113  INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
115  ff_h263_inter_MCBPC_code, 1, 1, 198);
116  INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
117  &ff_h263_cbpy_tab[0][1], 2, 1,
118  &ff_h263_cbpy_tab[0][0], 2, 1, 64);
119  INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
120  &ff_mvtab[0][1], 2, 1,
121  &ff_mvtab[0][0], 2, 1, 538);
126  INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
127  &ff_h263_mbtype_b_tab[0][1], 2, 1,
128  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
129  INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
130  &ff_cbpc_b_tab[0][1], 2, 1,
131  &ff_cbpc_b_tab[0][0], 2, 1, 8);
132  done = 1;
133  }
134 }
135 
137 {
138  int i, mb_pos;
139 
140  for(i=0; i<6; i++){
141  if(s->mb_num-1 <= ff_mba_max[i]) break;
142  }
143  mb_pos= get_bits(&s->gb, ff_mba_length[i]);
144  s->mb_x= mb_pos % s->mb_width;
145  s->mb_y= mb_pos / s->mb_width;
146 
147  return mb_pos;
148 }
149 
150 /**
151  * Decode the group of blocks header or slice header.
152  * @return <0 if an error occurred
153  */
155 {
156  unsigned int val, gob_number;
157  int left;
158 
159  /* Check for GOB Start Code */
160  val = show_bits(&s->gb, 16);
161  if(val)
162  return -1;
163 
164  /* We have a GBSC probably with GSTUFF */
165  skip_bits(&s->gb, 16); /* Drop the zeros */
166  left= get_bits_left(&s->gb);
167  //MN: we must check the bits left or we might end in a infinite loop (or segfault)
168  for(;left>13; left--){
169  if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
170  }
171  if(left<=13)
172  return -1;
173 
174  if(s->h263_slice_structured){
175  if(check_marker(&s->gb, "before MBA")==0)
176  return -1;
177 
179 
180  if(s->mb_num > 1583)
181  if(check_marker(&s->gb, "after MBA")==0)
182  return -1;
183 
184  s->qscale = get_bits(&s->gb, 5); /* SQUANT */
185  if(check_marker(&s->gb, "after SQUANT")==0)
186  return -1;
187  skip_bits(&s->gb, 2); /* GFID */
188  }else{
189  gob_number = get_bits(&s->gb, 5); /* GN */
190  s->mb_x= 0;
191  s->mb_y= s->gob_index* gob_number;
192  skip_bits(&s->gb, 2); /* GFID */
193  s->qscale = get_bits(&s->gb, 5); /* GQUANT */
194  }
195 
196  if(s->mb_y >= s->mb_height)
197  return -1;
198 
199  if(s->qscale==0)
200  return -1;
201 
202  return 0;
203 }
204 
205 /**
206  * Decode the group of blocks / video packet header.
207  * @return bit position of the resync_marker, or <0 if none was found
208  */
210  int left, pos, ret;
211 
212  if(s->codec_id==AV_CODEC_ID_MPEG4){
213  skip_bits1(&s->gb);
214  align_get_bits(&s->gb);
215  }
216 
217  if(show_bits(&s->gb, 16)==0){
218  pos= get_bits_count(&s->gb);
219  if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
221  else
222  ret= h263_decode_gob_header(s);
223  if(ret>=0)
224  return pos;
225  }
226  //OK, it's not where it is supposed to be ...
227  s->gb= s->last_resync_gb;
228  align_get_bits(&s->gb);
229  left= get_bits_left(&s->gb);
230 
231  for(;left>16+1+5+5; left-=8){
232  if(show_bits(&s->gb, 16)==0){
233  GetBitContext bak= s->gb;
234 
235  pos= get_bits_count(&s->gb);
236  if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
238  else
239  ret= h263_decode_gob_header(s);
240  if(ret>=0)
241  return pos;
242 
243  s->gb= bak;
244  }
245  skip_bits(&s->gb, 8);
246  }
247 
248  return -1;
249 }
250 
252 {
253  int code, val, sign, shift;
254  code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
255 
256  if (code == 0)
257  return pred;
258  if (code < 0)
259  return 0xffff;
260 
261  sign = get_bits1(&s->gb);
262  shift = f_code - 1;
263  val = code;
264  if (shift) {
265  val = (val - 1) << shift;
266  val |= get_bits(&s->gb, shift);
267  val++;
268  }
269  if (sign)
270  val = -val;
271  val += pred;
272 
273  /* modulo decoding */
274  if (!s->h263_long_vectors) {
275  val = sign_extend(val, 5 + f_code);
276  } else {
277  /* horrible h263 long vector mode */
278  if (pred < -31 && val < -63)
279  val += 64;
280  if (pred > 32 && val > 63)
281  val -= 64;
282 
283  }
284  return val;
285 }
286 
287 
288 /* Decode RVLC of H.263+ UMV */
290 {
291  int code = 0, sign;
292 
293  if (get_bits1(&s->gb)) /* Motion difference = 0 */
294  return pred;
295 
296  code = 2 + get_bits1(&s->gb);
297 
298  while (get_bits1(&s->gb))
299  {
300  code <<= 1;
301  code += get_bits1(&s->gb);
302  }
303  sign = code & 1;
304  code >>= 1;
305 
306  code = (sign) ? (pred - code) : (pred + code);
307  ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
308  return code;
309 
310 }
311 
312 /**
313  * read the next MVs for OBMC. yes this is a ugly hack, feel free to send a patch :)
314  */
316  GetBitContext gb= s->gb;
317 
318  int cbpc, i, pred_x, pred_y, mx, my;
319  int16_t *mot_val;
320  const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
321  const int stride= s->b8_stride*2;
322 
323  for(i=0; i<4; i++)
324  s->block_index[i]+= 2;
325  for(i=4; i<6; i++)
326  s->block_index[i]+= 1;
327  s->mb_x++;
328 
330 
331  do{
332  if (get_bits1(&s->gb)) {
333  /* skip mb */
334  mot_val = s->current_picture.motion_val[0][s->block_index[0]];
335  mot_val[0 ]= mot_val[2 ]=
336  mot_val[0+stride]= mot_val[2+stride]= 0;
337  mot_val[1 ]= mot_val[3 ]=
338  mot_val[1+stride]= mot_val[3+stride]= 0;
339 
341  goto end;
342  }
343  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
344  }while(cbpc == 20);
345 
346  if(cbpc & 4){
348  }else{
349  get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
350  if (cbpc & 8) {
351  if(s->modified_quant){
352  if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
353  else skip_bits(&s->gb, 5);
354  }else
355  skip_bits(&s->gb, 2);
356  }
357 
358  if ((cbpc & 16) == 0) {
360  /* 16x16 motion prediction */
361  mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
362  if (s->umvplus)
363  mx = h263p_decode_umotion(s, pred_x);
364  else
365  mx = ff_h263_decode_motion(s, pred_x, 1);
366 
367  if (s->umvplus)
368  my = h263p_decode_umotion(s, pred_y);
369  else
370  my = ff_h263_decode_motion(s, pred_y, 1);
371 
372  mot_val[0 ]= mot_val[2 ]=
373  mot_val[0+stride]= mot_val[2+stride]= mx;
374  mot_val[1 ]= mot_val[3 ]=
375  mot_val[1+stride]= mot_val[3+stride]= my;
376  } else {
378  for(i=0;i<4;i++) {
379  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
380  if (s->umvplus)
381  mx = h263p_decode_umotion(s, pred_x);
382  else
383  mx = ff_h263_decode_motion(s, pred_x, 1);
384 
385  if (s->umvplus)
386  my = h263p_decode_umotion(s, pred_y);
387  else
388  my = ff_h263_decode_motion(s, pred_y, 1);
389  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
390  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
391  mot_val[0] = mx;
392  mot_val[1] = my;
393  }
394  }
395  }
396 end:
397 
398  for(i=0; i<4; i++)
399  s->block_index[i]-= 2;
400  for(i=4; i<6; i++)
401  s->block_index[i]-= 1;
402  s->mb_x--;
403 
404  s->gb= gb;
405 }
406 
408  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
409 
410  if(s->modified_quant){
411  if(get_bits1(&s->gb))
413  else
414  s->qscale= get_bits(&s->gb, 5);
415  }else
416  s->qscale += quant_tab[get_bits(&s->gb, 2)];
417  ff_set_qscale(s, s->qscale);
418 }
419 
420 static int h263_decode_block(MpegEncContext * s, int16_t * block,
421  int n, int coded)
422 {
423  int level, i, j, run;
424  RLTable *rl = &ff_h263_rl_inter;
425  const uint8_t *scan_table;
426  GetBitContext gb= s->gb;
427 
428  scan_table = s->intra_scantable.permutated;
429  if (s->h263_aic && s->mb_intra) {
430  rl = &ff_rl_intra_aic;
431  i = 0;
432  if (s->ac_pred) {
433  if (s->h263_aic_dir)
434  scan_table = s->intra_v_scantable.permutated; /* left */
435  else
436  scan_table = s->intra_h_scantable.permutated; /* top */
437  }
438  } else if (s->mb_intra) {
439  /* DC coef */
440  if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
441  if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
442  int component, diff;
443  component = (n <= 3 ? 0 : n - 4 + 1);
444  level = s->last_dc[component];
445  if (s->rv10_first_dc_coded[component]) {
446  diff = ff_rv_decode_dc(s, n);
447  if (diff == 0xffff)
448  return -1;
449  level += diff;
450  level = level & 0xff; /* handle wrap round */
451  s->last_dc[component] = level;
452  } else {
453  s->rv10_first_dc_coded[component] = 1;
454  }
455  } else {
456  level = get_bits(&s->gb, 8);
457  if (level == 255)
458  level = 128;
459  }
460  }else{
461  level = get_bits(&s->gb, 8);
462  if((level&0x7F) == 0){
463  av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
465  return -1;
466  }
467  if (level == 255)
468  level = 128;
469  }
470  block[0] = level;
471  i = 1;
472  } else {
473  i = 0;
474  }
475  if (!coded) {
476  if (s->mb_intra && s->h263_aic)
477  goto not_coded;
478  s->block_last_index[n] = i - 1;
479  return 0;
480  }
481 retry:
482  {
483  OPEN_READER(re, &s->gb);
484  i--; // offset by -1 to allow direct indexing of scan_table
485  for(;;) {
486  UPDATE_CACHE(re, &s->gb);
487  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
488  if (run == 66) {
489  if (level){
490  CLOSE_READER(re, &s->gb);
491  av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
492  return -1;
493  }
494  /* escape */
495  if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
496  int is11 = SHOW_UBITS(re, &s->gb, 1);
497  SKIP_CACHE(re, &s->gb, 1);
498  run = SHOW_UBITS(re, &s->gb, 7) + 1;
499  if (is11) {
500  SKIP_COUNTER(re, &s->gb, 1 + 7);
501  UPDATE_CACHE(re, &s->gb);
502  level = SHOW_SBITS(re, &s->gb, 11);
503  SKIP_COUNTER(re, &s->gb, 11);
504  } else {
505  SKIP_CACHE(re, &s->gb, 7);
506  level = SHOW_SBITS(re, &s->gb, 7);
507  SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
508  }
509  } else {
510  run = SHOW_UBITS(re, &s->gb, 7) + 1;
511  SKIP_CACHE(re, &s->gb, 7);
512  level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
513  SKIP_COUNTER(re, &s->gb, 7 + 8);
514  if(level == -128){
515  UPDATE_CACHE(re, &s->gb);
516  if (s->codec_id == AV_CODEC_ID_RV10) {
517  /* XXX: should patch encoder too */
518  level = SHOW_SBITS(re, &s->gb, 12);
519  SKIP_COUNTER(re, &s->gb, 12);
520  }else{
521  level = SHOW_UBITS(re, &s->gb, 5);
522  SKIP_CACHE(re, &s->gb, 5);
523  level |= SHOW_SBITS(re, &s->gb, 6)<<5;
524  SKIP_COUNTER(re, &s->gb, 5 + 6);
525  }
526  }
527  }
528  } else {
529  if (SHOW_UBITS(re, &s->gb, 1))
530  level = -level;
531  SKIP_COUNTER(re, &s->gb, 1);
532  }
533  i += run;
534  if (i >= 64){
535  CLOSE_READER(re, &s->gb);
536  // redo update without last flag, revert -1 offset
537  i = i - run + ((run-1)&63) + 1;
538  if (i < 64) {
539  // only last marker, no overrun
540  block[scan_table[i]] = level;
541  break;
542  }
543  if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
544  //Looks like a hack but no, it's the way it is supposed to work ...
545  rl = &ff_rl_intra_aic;
546  i = 0;
547  s->gb= gb;
548  s->bdsp.clear_block(block);
549  goto retry;
550  }
551  av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
552  return -1;
553  }
554  j = scan_table[i];
555  block[j] = level;
556  }
557  }
558 not_coded:
559  if (s->mb_intra && s->h263_aic) {
560  ff_h263_pred_acdc(s, block, n);
561  i = 63;
562  }
563  s->block_last_index[n] = i;
564  return 0;
565 }
566 
567 static int h263_skip_b_part(MpegEncContext *s, int cbp)
568 {
569  LOCAL_ALIGNED_16(int16_t, dblock, [64]);
570  int i, mbi;
571  int bli[6];
572 
573  /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
574  * but real value should be restored in order to be used later (in OBMC condition)
575  */
576  mbi = s->mb_intra;
577  memcpy(bli, s->block_last_index, sizeof(bli));
578  s->mb_intra = 0;
579  for (i = 0; i < 6; i++) {
580  if (h263_decode_block(s, dblock, i, cbp&32) < 0)
581  return -1;
582  cbp+=cbp;
583  }
584  s->mb_intra = mbi;
585  memcpy(s->block_last_index, bli, sizeof(bli));
586  return 0;
587 }
588 
589 static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
590 {
591  int c, mv = 1;
592 
593  if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
594  c = get_bits1(gb);
595  if (pb_frame == 2 && c)
596  mv = !get_bits1(gb);
597  } else { // h.263 Annex M improved PB-frame
598  mv = get_unary(gb, 0, 4) + 1;
599  c = mv & 1;
600  mv = !!(mv & 2);
601  }
602  if(c)
603  *cbpb = get_bits(gb, 6);
604  return mv;
605 }
606 
608  int16_t block[6][64])
609 {
610  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
611  int16_t *mot_val;
612  const int xy= s->mb_x + s->mb_y * s->mb_stride;
613  int cbpb = 0, pb_mv_count = 0;
614 
615  av_assert2(!s->h263_pred);
616 
617  if (s->pict_type == AV_PICTURE_TYPE_P) {
618  do{
619  if (get_bits1(&s->gb)) {
620  /* skip mb */
621  s->mb_intra = 0;
622  for(i=0;i<6;i++)
623  s->block_last_index[i] = -1;
624  s->mv_dir = MV_DIR_FORWARD;
625  s->mv_type = MV_TYPE_16X16;
627  s->mv[0][0][0] = 0;
628  s->mv[0][0][1] = 0;
629  s->mb_skipped = !(s->obmc | s->loop_filter);
630  goto end;
631  }
632  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
633  if (cbpc < 0){
634  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
635  return -1;
636  }
637  }while(cbpc == 20);
638 
639  s->bdsp.clear_blocks(s->block[0]);
640 
641  dquant = cbpc & 8;
642  s->mb_intra = ((cbpc & 4) != 0);
643  if (s->mb_intra) goto intra;
644 
645  if(s->pb_frame && get_bits1(&s->gb))
646  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
647  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
648 
649  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
650  cbpy ^= 0xF;
651 
652  cbp = (cbpc & 3) | (cbpy << 2);
653  if (dquant) {
655  }
656 
657  s->mv_dir = MV_DIR_FORWARD;
658  if ((cbpc & 16) == 0) {
660  /* 16x16 motion prediction */
661  s->mv_type = MV_TYPE_16X16;
662  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
663  if (s->umvplus)
664  mx = h263p_decode_umotion(s, pred_x);
665  else
666  mx = ff_h263_decode_motion(s, pred_x, 1);
667 
668  if (mx >= 0xffff)
669  return -1;
670 
671  if (s->umvplus)
672  my = h263p_decode_umotion(s, pred_y);
673  else
674  my = ff_h263_decode_motion(s, pred_y, 1);
675 
676  if (my >= 0xffff)
677  return -1;
678  s->mv[0][0][0] = mx;
679  s->mv[0][0][1] = my;
680 
681  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
682  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
683  } else {
685  s->mv_type = MV_TYPE_8X8;
686  for(i=0;i<4;i++) {
687  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
688  if (s->umvplus)
689  mx = h263p_decode_umotion(s, pred_x);
690  else
691  mx = ff_h263_decode_motion(s, pred_x, 1);
692  if (mx >= 0xffff)
693  return -1;
694 
695  if (s->umvplus)
696  my = h263p_decode_umotion(s, pred_y);
697  else
698  my = ff_h263_decode_motion(s, pred_y, 1);
699  if (my >= 0xffff)
700  return -1;
701  s->mv[0][i][0] = mx;
702  s->mv[0][i][1] = my;
703  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
704  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
705  mot_val[0] = mx;
706  mot_val[1] = my;
707  }
708  }
709  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
710  int mb_type;
711  const int stride= s->b8_stride;
712  int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
713  int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
714 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
715 
716  //FIXME ugly
717  mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
718  mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
719  mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
720  mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
721 
722  do{
723  mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
724  if (mb_type < 0){
725  av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
726  return -1;
727  }
728 
729  mb_type= h263_mb_type_b_map[ mb_type ];
730  }while(!mb_type);
731 
732  s->mb_intra = IS_INTRA(mb_type);
733  if(HAS_CBP(mb_type)){
734  s->bdsp.clear_blocks(s->block[0]);
735  cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
736  if(s->mb_intra){
737  dquant = IS_QUANT(mb_type);
738  goto intra;
739  }
740 
741  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
742 
743  if (cbpy < 0){
744  av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
745  return -1;
746  }
747 
748  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
749  cbpy ^= 0xF;
750 
751  cbp = (cbpc & 3) | (cbpy << 2);
752  }else
753  cbp=0;
754 
755  av_assert2(!s->mb_intra);
756 
757  if(IS_QUANT(mb_type)){
759  }
760 
761  if(IS_DIRECT(mb_type)){
763  mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);
764  }else{
765  s->mv_dir = 0;
767 //FIXME UMV
768 
769  if(USES_LIST(mb_type, 0)){
770  int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my);
771  s->mv_dir = MV_DIR_FORWARD;
772 
773  mx = ff_h263_decode_motion(s, mx, 1);
774  my = ff_h263_decode_motion(s, my, 1);
775 
776  s->mv[0][0][0] = mx;
777  s->mv[0][0][1] = my;
778  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
779  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
780  }
781 
782  if(USES_LIST(mb_type, 1)){
783  int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my);
784  s->mv_dir |= MV_DIR_BACKWARD;
785 
786  mx = ff_h263_decode_motion(s, mx, 1);
787  my = ff_h263_decode_motion(s, my, 1);
788 
789  s->mv[1][0][0] = mx;
790  s->mv[1][0][1] = my;
791  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
792  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
793  }
794  }
795 
796  s->current_picture.mb_type[xy] = mb_type;
797  } else { /* I-Frame */
798  do{
799  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
800  if (cbpc < 0){
801  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
802  return -1;
803  }
804  }while(cbpc == 8);
805 
806  s->bdsp.clear_blocks(s->block[0]);
807 
808  dquant = cbpc & 4;
809  s->mb_intra = 1;
810 intra:
812  if (s->h263_aic) {
813  s->ac_pred = get_bits1(&s->gb);
814  if(s->ac_pred){
816 
817  s->h263_aic_dir = get_bits1(&s->gb);
818  }
819  }else
820  s->ac_pred = 0;
821 
822  if(s->pb_frame && get_bits1(&s->gb))
823  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
824  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
825  if(cbpy<0){
826  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
827  return -1;
828  }
829  cbp = (cbpc & 3) | (cbpy << 2);
830  if (dquant) {
832  }
833 
834  pb_mv_count += !!s->pb_frame;
835  }
836 
837  while(pb_mv_count--){
838  ff_h263_decode_motion(s, 0, 1);
839  ff_h263_decode_motion(s, 0, 1);
840  }
841 
842  /* decode each block */
843  for (i = 0; i < 6; i++) {
844  if (h263_decode_block(s, block[i], i, cbp&32) < 0)
845  return -1;
846  cbp+=cbp;
847  }
848 
849  if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
850  return -1;
851  if(s->obmc && !s->mb_intra){
852  if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
853  preview_obmc(s);
854  }
855 end:
856 
857  /* per-MB end of slice check */
858  {
859  int v= show_bits(&s->gb, 16);
860 
861  if (get_bits_left(&s->gb) < 16) {
862  v >>= 16 - get_bits_left(&s->gb);
863  }
864 
865  if(v==0)
866  return SLICE_END;
867  }
868 
869  return SLICE_OK;
870 }
871 
872 /* most is hardcoded. should extend to handle all h263 streams */
874 {
875  int format, width, height, i;
876  uint32_t startcode;
877 
878  align_get_bits(&s->gb);
879 
880  if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
881  av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
882  }
883 
884  startcode= get_bits(&s->gb, 22-8);
885 
886  for(i= get_bits_left(&s->gb); i>24; i-=8) {
887  startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
888 
889  if(startcode == 0x20)
890  break;
891  }
892 
893  if (startcode != 0x20) {
894  av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
895  return -1;
896  }
897  /* temporal reference */
898  i = get_bits(&s->gb, 8); /* picture timestamp */
899  if( (s->picture_number&~0xFF)+i < s->picture_number)
900  i+= 256;
901  s->picture_number= (s->picture_number&~0xFF) + i;
902 
903  /* PTYPE starts here */
904  if (check_marker(&s->gb, "in PTYPE") != 1) {
905  return -1;
906  }
907  if (get_bits1(&s->gb) != 0) {
908  av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
909  return -1; /* h263 id */
910  }
911  skip_bits1(&s->gb); /* split screen off */
912  skip_bits1(&s->gb); /* camera off */
913  skip_bits1(&s->gb); /* freeze picture release off */
914 
915  format = get_bits(&s->gb, 3);
916  /*
917  0 forbidden
918  1 sub-QCIF
919  10 QCIF
920  7 extended PTYPE (PLUSPTYPE)
921  */
922 
923  if (format != 7 && format != 6) {
924  s->h263_plus = 0;
925  /* H.263v1 */
926  width = ff_h263_format[format][0];
927  height = ff_h263_format[format][1];
928  if (!width)
929  return -1;
930 
932 
933  s->h263_long_vectors = get_bits1(&s->gb);
934 
935  if (get_bits1(&s->gb) != 0) {
936  av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n");
937  return -1; /* SAC: off */
938  }
939  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
940  s->unrestricted_mv = s->h263_long_vectors || s->obmc;
941 
942  s->pb_frame = get_bits1(&s->gb);
943  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
944  skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
945 
946  s->width = width;
947  s->height = height;
948  s->avctx->sample_aspect_ratio= (AVRational){12,11};
949  s->avctx->framerate = (AVRational){ 30000, 1001 };
950  } else {
951  int ufep;
952 
953  /* H.263v2 */
954  s->h263_plus = 1;
955  ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
956 
957  /* ufep other than 0 and 1 are reserved */
958  if (ufep == 1) {
959  /* OPPTYPE */
960  format = get_bits(&s->gb, 3);
961  ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
962  s->custom_pcf= get_bits1(&s->gb);
963  s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
964  if (get_bits1(&s->gb) != 0) {
965  av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
966  }
967  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
968  s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
969  s->loop_filter= get_bits1(&s->gb);
970  s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
971  if(s->avctx->lowres)
972  s->loop_filter = 0;
973 
975  if (get_bits1(&s->gb) != 0) {
976  av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
977  }
978  if (get_bits1(&s->gb) != 0) {
979  av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
980  }
981  s->alt_inter_vlc= get_bits1(&s->gb);
982  s->modified_quant= get_bits1(&s->gb);
983  if(s->modified_quant)
985 
986  skip_bits(&s->gb, 1); /* Prevent start code emulation */
987 
988  skip_bits(&s->gb, 3); /* Reserved */
989  } else if (ufep != 0) {
990  av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
991  return -1;
992  }
993 
994  /* MPPTYPE */
995  s->pict_type = get_bits(&s->gb, 3);
996  switch(s->pict_type){
997  case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
998  case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
999  case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
1000  case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
1001  case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
1002  default:
1003  return -1;
1004  }
1005  skip_bits(&s->gb, 2);
1006  s->no_rounding = get_bits1(&s->gb);
1007  skip_bits(&s->gb, 4);
1008 
1009  /* Get the picture dimensions */
1010  if (ufep) {
1011  if (format == 6) {
1012  /* Custom Picture Format (CPFMT) */
1013  s->aspect_ratio_info = get_bits(&s->gb, 4);
1014  ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1015  /* aspect ratios:
1016  0 - forbidden
1017  1 - 1:1
1018  2 - 12:11 (CIF 4:3)
1019  3 - 10:11 (525-type 4:3)
1020  4 - 16:11 (CIF 16:9)
1021  5 - 40:33 (525-type 16:9)
1022  6-14 - reserved
1023  */
1024  width = (get_bits(&s->gb, 9) + 1) * 4;
1025  check_marker(&s->gb, "in dimensions");
1026  height = get_bits(&s->gb, 9) * 4;
1027  ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1029  /* aspected dimensions */
1030  s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1031  s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1032  }else{
1034  }
1035  } else {
1036  width = ff_h263_format[format][0];
1037  height = ff_h263_format[format][1];
1038  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1039  }
1041  if ((width == 0) || (height == 0))
1042  return -1;
1043  s->width = width;
1044  s->height = height;
1045 
1046  if(s->custom_pcf){
1047  int gcd;
1048  s->avctx->framerate.num = 1800000;
1049  s->avctx->framerate.den = 1000 + get_bits1(&s->gb);
1050  s->avctx->framerate.den *= get_bits(&s->gb, 7);
1051  if(s->avctx->framerate.den == 0){
1052  av_log(s, AV_LOG_ERROR, "zero framerate\n");
1053  return -1;
1054  }
1055  gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1056  s->avctx->framerate.den /= gcd;
1057  s->avctx->framerate.num /= gcd;
1058  }else{
1059  s->avctx->framerate = (AVRational){ 30000, 1001 };
1060  }
1061  }
1062 
1063  if(s->custom_pcf){
1064  skip_bits(&s->gb, 2); //extended Temporal reference
1065  }
1066 
1067  if (ufep) {
1068  if (s->umvplus) {
1069  if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1070  skip_bits1(&s->gb);
1071  }
1072  if(s->h263_slice_structured){
1073  if (get_bits1(&s->gb) != 0) {
1074  av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1075  }
1076  if (get_bits1(&s->gb) != 0) {
1077  av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1078  }
1079  }
1080  }
1081 
1082  s->qscale = get_bits(&s->gb, 5);
1083  }
1084 
1085  if (s->width == 0 || s->height == 0) {
1086  av_log(s->avctx, AV_LOG_ERROR, "dimensions 0\n");
1087  return -1;
1088  }
1089  s->mb_width = (s->width + 15) / 16;
1090  s->mb_height = (s->height + 15) / 16;
1091  s->mb_num = s->mb_width * s->mb_height;
1092 
1093  if (s->pb_frame) {
1094  skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1095  if (s->custom_pcf)
1096  skip_bits(&s->gb, 2); //extended Temporal reference
1097  skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1098  }
1099 
1100  if (s->pict_type!=AV_PICTURE_TYPE_B) {
1101  s->time = s->picture_number;
1102  s->pp_time = s->time - s->last_non_b_time;
1103  s->last_non_b_time = s->time;
1104  }else{
1105  s->time = s->picture_number;
1106  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1107  if (s->pp_time <=s->pb_time ||
1108  s->pp_time <= s->pp_time - s->pb_time ||
1109  s->pp_time <= 0){
1110  s->pp_time = 2;
1111  s->pb_time = 1;
1112  }
1114  }
1115 
1116  /* PEI */
1117  if (skip_1stop_8data_bits(&s->gb) < 0)
1118  return AVERROR_INVALIDDATA;
1119 
1120  if(s->h263_slice_structured){
1121  if (check_marker(&s->gb, "SEPB1") != 1) {
1122  return -1;
1123  }
1124 
1125  ff_h263_decode_mba(s);
1126 
1127  if (check_marker(&s->gb, "SEPB2") != 1) {
1128  return -1;
1129  }
1130  }
1131  s->f_code = 1;
1132 
1133  if(s->h263_aic){
1134  s->y_dc_scale_table=
1136  }else{
1137  s->y_dc_scale_table=
1139  }
1140 
1142  if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
1143  int i,j;
1144  for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1145  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1146  for(i=0; i<13; i++){
1147  for(j=0; j<3; j++){
1148  int v= get_bits(&s->gb, 8);
1149  v |= get_sbits(&s->gb, 8)<<8;
1150  av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1151  }
1152  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1153  }
1154  for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1155  }
1156 
1157  return 0;
1158 }
av_cold void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:105
int rv10_first_dc_coded[3]
Definition: mpegvideo.h:484
#define ff_tlog(ctx,...)
Definition: internal.h:60
AVRational framerate
Definition: avcodec.h:3023
#define MB_TYPE_SKIP
Definition: avcodec.h:905
const char const char void * val
Definition: avisynth_c.h:634
float v
int aspect_ratio_info
Definition: mpegvideo.h:465
int picture_number
Definition: mpegvideo.h:196
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ScanTable intra_v_scantable
Definition: mpegvideo.h:162
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:154
static int shift(int a, int b)
Definition: sonic.c:82
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:96
#define CBPY_VLC_BITS
Definition: h263.h:40
#define GET_RL_VLC
Definition: get_bits.h:689
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:257
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:260
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
RLTable ff_h263_rl_inter
Definition: h263data.h:162
const uint8_t ff_h263_intra_MCBPC_code[9]
Definition: h263data.h:36
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:180
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:894
enum AVCodecID codec_id
Definition: mpegvideo.h:181
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
int obmc
overlapped block motion compensation
Definition: mpegvideo.h:432
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:1623
#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:420
#define MB_TYPE_QUANT
Definition: avcodec.h:913
mpegvideo header.
#define HAS_CBP(a)
Definition: mpegutils.h:97
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:149
const uint16_t ff_h263_format[8][2]
Definition: h263data.h:239
#define SLICE_OK
Definition: mpegvideo.h:561
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:202
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:273
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:245
int h263_aic
Advanded INTRA Coding (AIC)
Definition: mpegvideo.h:156
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.
int modified_quant
Definition: mpegvideo.h:444
#define USES_LIST(a, list)
Definition: mpegutils.h:95
int alt_inter_vlc
alternative inter vlc
Definition: mpegvideo.h:443
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:425
int64_t time
time of current frame
Definition: mpegvideo.h:453
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 (mpeg4) ...
Definition: mpegvideo.h:331
uint8_t
#define av_cold
Definition: attributes.h:74
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:63
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:476
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 av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
static VLC h263_mbtype_b_vlc
Definition: ituh263dec.c:99
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:351
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:249
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:424
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
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:84
uint16_t pp_time
time distance between the last 2 p,s,i frames
Definition: mpegvideo.h:455
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:198
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:2737
static int h263_skip_b_part(MpegEncContext *s, int cbp)
Definition: ituh263dec.c:567
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:189
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.h:275
#define av_log(a,...)
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:3240
const uint8_t ff_mba_length[7]
Definition: h263data.h:271
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:588
#define H263_MBTYPE_B_VLC_BITS
Definition: ituh263dec.c:52
int h263_plus
h263 plus headers
Definition: mpegvideo.h:178
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:173
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:254
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:264
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:292
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:251
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
static const int h263_mb_type_b_map[15]
Definition: ituh263dec.c:55
int h263_slice_structured
Definition: mpegvideo.h:442
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:39
int64_t av_gcd(int64_t a, int64_t b)
Return the greatest common divisor of a and b.
Definition: mathematics.c:55
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:589
GetBitContext gb
Definition: mpegvideo.h:509
#define CLOSE_READER(name, gb)
Definition: get_bits.h:144
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
Libavcodec external API header.
static int check_marker(GetBitContext *s, const char *msg)
Definition: get_bits.h:393
Definition: get_bits.h:63
common internal API header
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2612
#define MB_TYPE_DIRECT2
Definition: avcodec.h:902
#define IS_DIRECT(a)
Definition: mpegutils.h:80
int umvplus
== H263+ && unrestricted_mv
Definition: mpegvideo.h:440
ret
Definition: avfilter.c:974
int16_t(*[2] motion_val)[2]
Definition: mpegvideo.h:97
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:287
#define MB_TYPE_L0L1
Definition: avcodec.h:912
const uint16_t ff_mba_max[6]
Definition: h263data.h:267
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:555
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:155
int n
Definition: avisynth_c.h:547
int pb_frame
PB frame mode (0 = none, 1 = base, 2 = improved)
Definition: mpegvideo.h:175
#define MB_TYPE_ACPRED
Definition: avcodec.h:903
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:97
#define MB_TYPE_L1
Definition: avcodec.h:911
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.h:248
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:136
const uint8_t ff_h263_inter_MCBPC_code[28]
Definition: h263data.h:41
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:47
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:206
static int h263p_decode_umotion(MpegEncContext *s, int pred)
Definition: ituh263dec.c:289
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:360
static const float pred[4]
Definition: siprdata.h:259
static const int8_t mv[256][2]
Definition: 4xm.c:77
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:333
#define MV_VLC_BITS
Definition: ituh263dec.c:51
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:330
int64_t last_non_b_time
Definition: mpegvideo.h:454
#define ff_dlog(ctx,...)
Definition: internal.h:54
int h263_flv
use flv h263 header
Definition: mpegvideo.h:179
BlockDSPContext bdsp
Definition: mpegvideo.h:295
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:2565
ScanTable intra_scantable
Definition: mpegvideo.h:160
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:169
#define IS_QUANT(a)
Definition: mpegutils.h:91
#define OPEN_READER(name, gb)
Definition: get_bits.h:133
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:37
#define SLICE_END
end marker found
Definition: mpegvideo.h:563
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:95
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:329
ScanTable intra_h_scantable
Definition: mpegvideo.h:161
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
rational number numerator/denominator
Definition: rational.h:43
#define CBPC_B_VLC_BITS
Definition: ituh263dec.c:53
#define MB_TYPE_16x16
Definition: avcodec.h:897
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:209
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:175
int f_code
forward MV resolution
Definition: mpegvideo.h:307
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:873
#define MV_DIR_FORWARD
Definition: mpegvideo.h:329
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:281
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:139
static void h263_decode_dquant(MpegEncContext *s)
Definition: ituh263dec.c:407
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:174
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:258
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1427
uint8_t level
Definition: svq3.c:150
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2566
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:343
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:200
MpegEncContext.
Definition: mpegvideo.h:150
struct AVCodecContext * avctx
Definition: mpegvideo.h:167
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:207
#define MB_TYPE_CBP
Definition: avcodec.h:914
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
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:199
void ff_h263_pred_acdc(MpegEncContext *s, int16_t *block, int n)
Definition: h263.c:226
#define TEX_VLC_BITS
Definition: dv.h:93
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
static double c[64]
#define MB_TYPE_8x8
Definition: avcodec.h:900
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:196
Bi-dir predicted.
Definition: avutil.h:269
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2621
int den
denominator
Definition: rational.h:45
const uint8_t * chroma_qscale_table
qscale -> chroma_qscale (h263)
Definition: mpegvideo.h:259
#define IS_INTRA(x, y)
void * priv_data
Definition: avcodec.h:1283
static av_always_inline int diff(const uint32_t a, const uint32_t b)
float re
Definition: fft-test.c:73
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
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:558
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2627
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:449
int chroma_qscale
chroma QP
Definition: mpegvideo.h:274
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2016
static void preview_obmc(MpegEncContext *s)
read the next MVs for OBMC.
Definition: ituh263dec.c:315
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegvideo.h:100
#define LOCAL_ALIGNED_16(t, v,...)
Definition: internal.h:120
int rv10_version
RV10 version: 0 or 3.
Definition: mpegvideo.h:483
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:593
int h263_long_vectors
use horrible h263v1 long vector mode
Definition: mpegvideo.h:293
#define stride
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:334
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:441
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:85
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:607
#define MB_TYPE_L0
Definition: avcodec.h:910
Predicted.
Definition: avutil.h:268
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:38
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:456
static int width
static int16_t block[64]
Definition: dct-test.c:110