FFmpeg  4.4
ituh263dec.c
Go to the documentation of this file.
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 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  * H.263 decoder.
28  */
29 
30 #define UNCHECKED_BITSTREAM_READER 1
31 #include <limits.h>
32 
33 #include "libavutil/attributes.h"
34 #include "libavutil/imgutils.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/mathematics.h"
37 #include "libavutil/mem_internal.h"
38 #include "avcodec.h"
39 #include "mpegvideo.h"
40 #include "h263.h"
41 #include "h263data.h"
42 #include "internal.h"
43 #include "mathops.h"
44 #include "mpegutils.h"
45 #include "unary.h"
46 #include "flv.h"
47 #include "rv10.h"
48 #include "mpeg4video.h"
49 #include "mpegvideodata.h"
50 
51 // The defines below define the number of bits that are read at once for
52 // reading vlc values. Changing these may improve speed and data cache needs
53 // be aware though that decreasing them may need the number of stages that is
54 // passed to get_vlc* to be increased.
55 #define H263_MBTYPE_B_VLC_BITS 6
56 #define CBPC_B_VLC_BITS 3
57 
58 static const int h263_mb_type_b_map[15]= {
71  0, //stuffing
74 };
75 
77  if(s->avctx->debug&FF_DEBUG_PICT_INFO){
78  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->qscale, av_get_picture_type_char(s->pict_type),
80  s->gb.size_in_bits, 1-s->no_rounding,
81  s->obmc ? " AP" : "",
82  s->umvplus ? " UMV" : "",
83  s->h263_long_vectors ? " LONG" : "",
84  s->h263_plus ? " +" : "",
85  s->h263_aic ? " AIC" : "",
86  s->alt_inter_vlc ? " AIV" : "",
87  s->modified_quant ? " MQ" : "",
88  s->loop_filter ? " LOOP" : "",
89  s->h263_slice_structured ? " SS" : "",
90  s->avctx->framerate.num, s->avctx->framerate.den
91  );
92  }
93 }
94 
95 /***********************************************/
96 /* decoding */
97 
104 
105 /* init vlcs */
106 
107 /* XXX: find a better solution to handle static init */
109 {
110  static volatile int done = 0;
111 
112  if (!done) {
115  ff_h263_intra_MCBPC_code, 1, 1, 72);
118  ff_h263_inter_MCBPC_code, 1, 1, 198);
120  &ff_h263_cbpy_tab[0][1], 2, 1,
121  &ff_h263_cbpy_tab[0][0], 2, 1, 64);
123  &ff_mvtab[0][1], 2, 1,
124  &ff_mvtab[0][0], 2, 1, 538);
129  &ff_h263_mbtype_b_tab[0][1], 2, 1,
130  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
132  &ff_cbpc_b_tab[0][1], 2, 1,
133  &ff_cbpc_b_tab[0][0], 2, 1, 8);
134  done = 1;
135  }
136 }
137 
139 {
140  int i, mb_pos;
141 
142  for (i = 0; i < 6; i++)
143  if (s->mb_num - 1 <= ff_mba_max[i])
144  break;
145  mb_pos = get_bits(&s->gb, ff_mba_length[i]);
146  s->mb_x = mb_pos % s->mb_width;
147  s->mb_y = mb_pos / s->mb_width;
148 
149  return mb_pos;
150 }
151 
152 /**
153  * Decode the group of blocks header or slice header.
154  * @return <0 if an error occurred
155  */
157 {
158  unsigned int val, gob_number;
159  int left;
160 
161  /* Check for GOB Start Code */
162  val = show_bits(&s->gb, 16);
163  if(val)
164  return -1;
165 
166  /* We have a GBSC probably with GSTUFF */
167  skip_bits(&s->gb, 16); /* Drop the zeros */
168  left= get_bits_left(&s->gb);
169  left = FFMIN(left, 32);
170  //MN: we must check the bits left or we might end in an 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(check_marker(s->avctx, &s->gb, "before MBA")==0)
179  return -1;
180 
182 
183  if(s->mb_num > 1583)
184  if(check_marker(s->avctx, &s->gb, "after MBA")==0)
185  return -1;
186 
187  s->qscale = get_bits(&s->gb, 5); /* SQUANT */
188  if(check_marker(s->avctx, &s->gb, "after SQUANT")==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 
208 /**
209  * Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
210  * @return bit position of the resync_marker, or <0 if none was found
211  */
213  int left, pos, ret;
214 
215  /* In MPEG-4 studio mode look for a new slice startcode
216  * and decode slice header */
217  if(s->codec_id==AV_CODEC_ID_MPEG4 && s->studio_profile) {
218  align_get_bits(&s->gb);
219 
220  while (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) != SLICE_START_CODE) {
221  get_bits(&s->gb, 8);
222  }
223 
224  if (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) == SLICE_START_CODE)
225  return get_bits_count(&s->gb);
226  else
227  return -1;
228  }
229 
230  if(s->codec_id==AV_CODEC_ID_MPEG4){
231  skip_bits1(&s->gb);
232  align_get_bits(&s->gb);
233  }
234 
235  if(show_bits(&s->gb, 16)==0){
236  pos= get_bits_count(&s->gb);
237  if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
238  ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
239  else
241  if(ret>=0)
242  return pos;
243  }
244  //OK, it's not where it is supposed to be ...
245  s->gb= s->last_resync_gb;
246  align_get_bits(&s->gb);
247  left= get_bits_left(&s->gb);
248 
249  for(;left>16+1+5+5; left-=8){
250  if(show_bits(&s->gb, 16)==0){
251  GetBitContext bak= s->gb;
252 
253  pos= get_bits_count(&s->gb);
254  if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
255  ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
256  else
258  if(ret>=0)
259  return pos;
260 
261  s->gb= bak;
262  }
263  skip_bits(&s->gb, 8);
264  }
265 
266  return -1;
267 }
268 
270 {
271  int code, val, sign, shift;
273 
274  if (code == 0)
275  return pred;
276  if (code < 0)
277  return 0xffff;
278 
279  sign = get_bits1(&s->gb);
280  shift = f_code - 1;
281  val = code;
282  if (shift) {
283  val = (val - 1) << shift;
284  val |= get_bits(&s->gb, shift);
285  val++;
286  }
287  if (sign)
288  val = -val;
289  val += pred;
290 
291  /* modulo decoding */
292  if (!s->h263_long_vectors) {
293  val = sign_extend(val, 5 + f_code);
294  } else {
295  /* horrible H.263 long vector mode */
296  if (pred < -31 && val < -63)
297  val += 64;
298  if (pred > 32 && val > 63)
299  val -= 64;
300 
301  }
302  return val;
303 }
304 
305 
306 /* Decode RVLC of H.263+ UMV */
308 {
309  int code = 0, sign;
310 
311  if (get_bits1(&s->gb)) /* Motion difference = 0 */
312  return pred;
313 
314  code = 2 + get_bits1(&s->gb);
315 
316  while (get_bits1(&s->gb))
317  {
318  code <<= 1;
319  code += get_bits1(&s->gb);
320  if (code >= 32768) {
321  avpriv_request_sample(s->avctx, "Huge DMV");
322  return 0xffff;
323  }
324  }
325  sign = code & 1;
326  code >>= 1;
327 
328  code = (sign) ? (pred - code) : (pred + code);
329  ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
330  return code;
331 
332 }
333 
334 /**
335  * read the next MVs for OBMC. yes this is an ugly hack, feel free to send a patch :)
336  */
338  GetBitContext gb= s->gb;
339 
340  int cbpc, i, pred_x, pred_y, mx, my;
341  int16_t *mot_val;
342  const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
343  const int stride= s->b8_stride*2;
344 
345  for(i=0; i<4; i++)
346  s->block_index[i]+= 2;
347  for(i=4; i<6; i++)
348  s->block_index[i]+= 1;
349  s->mb_x++;
350 
351  av_assert2(s->pict_type == AV_PICTURE_TYPE_P);
352 
353  do{
354  if (get_bits1(&s->gb)) {
355  /* skip mb */
356  mot_val = s->current_picture.motion_val[0][s->block_index[0]];
357  mot_val[0 ]= mot_val[2 ]=
358  mot_val[0+stride]= mot_val[2+stride]= 0;
359  mot_val[1 ]= mot_val[3 ]=
360  mot_val[1+stride]= mot_val[3+stride]= 0;
361 
362  s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
363  goto end;
364  }
366  }while(cbpc == 20);
367 
368  if(cbpc & 4){
369  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
370  }else{
372  if (cbpc & 8) {
373  if(s->modified_quant){
374  if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
375  else skip_bits(&s->gb, 5);
376  }else
377  skip_bits(&s->gb, 2);
378  }
379 
380  if ((cbpc & 16) == 0) {
381  s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
382  /* 16x16 motion prediction */
383  mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
384  if (s->umvplus)
385  mx = h263p_decode_umotion(s, pred_x);
386  else
387  mx = ff_h263_decode_motion(s, pred_x, 1);
388 
389  if (s->umvplus)
390  my = h263p_decode_umotion(s, pred_y);
391  else
392  my = ff_h263_decode_motion(s, pred_y, 1);
393 
394  mot_val[0 ]= mot_val[2 ]=
395  mot_val[0+stride]= mot_val[2+stride]= mx;
396  mot_val[1 ]= mot_val[3 ]=
397  mot_val[1+stride]= mot_val[3+stride]= my;
398  } else {
399  s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
400  for(i=0;i<4;i++) {
401  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
402  if (s->umvplus)
403  mx = h263p_decode_umotion(s, pred_x);
404  else
405  mx = ff_h263_decode_motion(s, pred_x, 1);
406 
407  if (s->umvplus)
408  my = h263p_decode_umotion(s, pred_y);
409  else
410  my = ff_h263_decode_motion(s, pred_y, 1);
411  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
412  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
413  mot_val[0] = mx;
414  mot_val[1] = my;
415  }
416  }
417  }
418 end:
419 
420  for(i=0; i<4; i++)
421  s->block_index[i]-= 2;
422  for(i=4; i<6; i++)
423  s->block_index[i]-= 1;
424  s->mb_x--;
425 
426  s->gb= gb;
427 }
428 
430  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
431 
432  if(s->modified_quant){
433  if(get_bits1(&s->gb))
434  s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
435  else
436  s->qscale= get_bits(&s->gb, 5);
437  }else
438  s->qscale += quant_tab[get_bits(&s->gb, 2)];
439  ff_set_qscale(s, s->qscale);
440 }
441 
442 static int h263_decode_block(MpegEncContext * s, int16_t * block,
443  int n, int coded)
444 {
445  int level, i, j, run;
446  RLTable *rl = &ff_h263_rl_inter;
447  const uint8_t *scan_table;
448  GetBitContext gb= s->gb;
449 
450  scan_table = s->intra_scantable.permutated;
451  if (s->h263_aic && s->mb_intra) {
452  rl = &ff_rl_intra_aic;
453  i = 0;
454  if (s->ac_pred) {
455  if (s->h263_aic_dir)
456  scan_table = s->intra_v_scantable.permutated; /* left */
457  else
458  scan_table = s->intra_h_scantable.permutated; /* top */
459  }
460  } else if (s->mb_intra) {
461  /* DC coef */
462  if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
463  if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
464  int component, diff;
465  component = (n <= 3 ? 0 : n - 4 + 1);
466  level = s->last_dc[component];
467  if (s->rv10_first_dc_coded[component]) {
468  diff = ff_rv_decode_dc(s, n);
469  if (diff < 0)
470  return -1;
471  level += diff;
472  level = level & 0xff; /* handle wrap round */
473  s->last_dc[component] = level;
474  } else {
475  s->rv10_first_dc_coded[component] = 1;
476  }
477  } else {
478  level = get_bits(&s->gb, 8);
479  if (level == 255)
480  level = 128;
481  }
482  }else{
483  level = get_bits(&s->gb, 8);
484  if((level&0x7F) == 0){
485  av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
486  if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
487  return -1;
488  }
489  if (level == 255)
490  level = 128;
491  }
492  block[0] = level;
493  i = 1;
494  } else {
495  i = 0;
496  }
497  if (!coded) {
498  if (s->mb_intra && s->h263_aic)
499  goto not_coded;
500  s->block_last_index[n] = i - 1;
501  return 0;
502  }
503 retry:
504  {
505  OPEN_READER(re, &s->gb);
506  i--; // offset by -1 to allow direct indexing of scan_table
507  for(;;) {
508  UPDATE_CACHE(re, &s->gb);
509  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
510  if (run == 66) {
511  if (level){
512  CLOSE_READER(re, &s->gb);
513  av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
514  return -1;
515  }
516  /* escape */
517  if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
518  int is11 = SHOW_UBITS(re, &s->gb, 1);
519  SKIP_CACHE(re, &s->gb, 1);
520  run = SHOW_UBITS(re, &s->gb, 7) + 1;
521  if (is11) {
522  SKIP_COUNTER(re, &s->gb, 1 + 7);
523  UPDATE_CACHE(re, &s->gb);
524  level = SHOW_SBITS(re, &s->gb, 11);
525  SKIP_COUNTER(re, &s->gb, 11);
526  } else {
527  SKIP_CACHE(re, &s->gb, 7);
528  level = SHOW_SBITS(re, &s->gb, 7);
529  SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
530  }
531  } else {
532  run = SHOW_UBITS(re, &s->gb, 7) + 1;
533  SKIP_CACHE(re, &s->gb, 7);
534  level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
535  SKIP_COUNTER(re, &s->gb, 7 + 8);
536  if(level == -128){
537  UPDATE_CACHE(re, &s->gb);
538  if (s->codec_id == AV_CODEC_ID_RV10) {
539  /* XXX: should patch encoder too */
540  level = SHOW_SBITS(re, &s->gb, 12);
541  SKIP_COUNTER(re, &s->gb, 12);
542  }else{
543  level = SHOW_UBITS(re, &s->gb, 5);
544  SKIP_CACHE(re, &s->gb, 5);
545  level |= SHOW_SBITS(re, &s->gb, 6) * (1<<5);
546  SKIP_COUNTER(re, &s->gb, 5 + 6);
547  }
548  }
549  }
550  } else {
551  if (SHOW_UBITS(re, &s->gb, 1))
552  level = -level;
553  SKIP_COUNTER(re, &s->gb, 1);
554  }
555  i += run;
556  if (i >= 64){
557  CLOSE_READER(re, &s->gb);
558  // redo update without last flag, revert -1 offset
559  i = i - run + ((run-1)&63) + 1;
560  if (i < 64) {
561  // only last marker, no overrun
562  block[scan_table[i]] = level;
563  break;
564  }
565  if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
566  //Looks like a hack but no, it's the way it is supposed to work ...
567  rl = &ff_rl_intra_aic;
568  i = 0;
569  s->gb= gb;
570  s->bdsp.clear_block(block);
571  goto retry;
572  }
573  av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
574  return -1;
575  }
576  j = scan_table[i];
577  block[j] = level;
578  }
579  }
580 not_coded:
581  if (s->mb_intra && s->h263_aic) {
583  i = 63;
584  }
585  s->block_last_index[n] = i;
586  return 0;
587 }
588 
589 static int h263_skip_b_part(MpegEncContext *s, int cbp)
590 {
591  LOCAL_ALIGNED_32(int16_t, dblock, [64]);
592  int i, mbi;
593  int bli[6];
594 
595  /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
596  * but real value should be restored in order to be used later (in OBMC condition)
597  */
598  mbi = s->mb_intra;
599  memcpy(bli, s->block_last_index, sizeof(bli));
600  s->mb_intra = 0;
601  for (i = 0; i < 6; i++) {
602  if (h263_decode_block(s, dblock, i, cbp&32) < 0)
603  return -1;
604  cbp+=cbp;
605  }
606  s->mb_intra = mbi;
607  memcpy(s->block_last_index, bli, sizeof(bli));
608  return 0;
609 }
610 
611 static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
612 {
613  int c, mv = 1;
614 
615  if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
616  c = get_bits1(gb);
617  if (pb_frame == 2 && c)
618  mv = !get_bits1(gb);
619  } else { // h.263 Annex M improved PB-frame
620  mv = get_unary(gb, 0, 4) + 1;
621  c = mv & 1;
622  mv = !!(mv & 2);
623  }
624  if(c)
625  *cbpb = get_bits(gb, 6);
626  return mv;
627 }
628 
629 #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
630 #define tab_bias (tab_size / 2)
631 static inline void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
632 {
633  int xy = s->block_index[i];
634  uint16_t time_pp = s->pp_time;
635  uint16_t time_pb = s->pb_time;
636  int p_mx, p_my;
637 
638  p_mx = p->motion_val[0][xy][0];
639  if ((unsigned)(p_mx + tab_bias) < tab_size) {
640  s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias];
641  s->mv[1][i][0] = s->direct_scale_mv[1][p_mx + tab_bias];
642  } else {
643  s->mv[0][i][0] = p_mx * time_pb / time_pp;
644  s->mv[1][i][0] = p_mx * (time_pb - time_pp) / time_pp;
645  }
646  p_my = p->motion_val[0][xy][1];
647  if ((unsigned)(p_my + tab_bias) < tab_size) {
648  s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias];
649  s->mv[1][i][1] = s->direct_scale_mv[1][p_my + tab_bias];
650  } else {
651  s->mv[0][i][1] = p_my * time_pb / time_pp;
652  s->mv[1][i][1] = p_my * (time_pb - time_pp) / time_pp;
653  }
654 }
655 
656 /**
657  * @return the mb_type
658  */
660 {
661  const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
662  Picture *p = &s->next_picture;
663  int colocated_mb_type = p->mb_type[mb_index];
664  int i;
665 
666  if (s->codec_tag == AV_RL32("U263") && p->f->pict_type == AV_PICTURE_TYPE_I) {
667  p = &s->last_picture;
668  colocated_mb_type = p->mb_type[mb_index];
669  }
670 
671  if (IS_8X8(colocated_mb_type)) {
672  s->mv_type = MV_TYPE_8X8;
673  for (i = 0; i < 4; i++)
674  set_one_direct_mv(s, p, i);
676  } else {
677  set_one_direct_mv(s, p, 0);
678  s->mv[0][1][0] =
679  s->mv[0][2][0] =
680  s->mv[0][3][0] = s->mv[0][0][0];
681  s->mv[0][1][1] =
682  s->mv[0][2][1] =
683  s->mv[0][3][1] = s->mv[0][0][1];
684  s->mv[1][1][0] =
685  s->mv[1][2][0] =
686  s->mv[1][3][0] = s->mv[1][0][0];
687  s->mv[1][1][1] =
688  s->mv[1][2][1] =
689  s->mv[1][3][1] = s->mv[1][0][1];
690  s->mv_type = MV_TYPE_8X8;
691  // Note see prev line
693  }
694 }
695 
697  int16_t block[6][64])
698 {
699  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
700  int16_t *mot_val;
701  const int xy= s->mb_x + s->mb_y * s->mb_stride;
702  int cbpb = 0, pb_mv_count = 0;
703 
704  av_assert2(!s->h263_pred);
705 
706  if (s->pict_type == AV_PICTURE_TYPE_P) {
707  do{
708  if (get_bits1(&s->gb)) {
709  /* skip mb */
710  s->mb_intra = 0;
711  for(i=0;i<6;i++)
712  s->block_last_index[i] = -1;
713  s->mv_dir = MV_DIR_FORWARD;
714  s->mv_type = MV_TYPE_16X16;
715  s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
716  s->mv[0][0][0] = 0;
717  s->mv[0][0][1] = 0;
718  s->mb_skipped = !(s->obmc | s->loop_filter);
719  goto end;
720  }
722  if (cbpc < 0){
723  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
724  return SLICE_ERROR;
725  }
726  }while(cbpc == 20);
727 
728  s->bdsp.clear_blocks(s->block[0]);
729 
730  dquant = cbpc & 8;
731  s->mb_intra = ((cbpc & 4) != 0);
732  if (s->mb_intra) goto intra;
733 
734  if(s->pb_frame && get_bits1(&s->gb))
735  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
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, "cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
740  return SLICE_ERROR;
741  }
742 
743  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
744  cbpy ^= 0xF;
745 
746  cbp = (cbpc & 3) | (cbpy << 2);
747  if (dquant) {
749  }
750 
751  s->mv_dir = MV_DIR_FORWARD;
752  if ((cbpc & 16) == 0) {
753  s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
754  /* 16x16 motion prediction */
755  s->mv_type = MV_TYPE_16X16;
756  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
757  if (s->umvplus)
758  mx = h263p_decode_umotion(s, pred_x);
759  else
760  mx = ff_h263_decode_motion(s, pred_x, 1);
761 
762  if (mx >= 0xffff)
763  return SLICE_ERROR;
764 
765  if (s->umvplus)
766  my = h263p_decode_umotion(s, pred_y);
767  else
768  my = ff_h263_decode_motion(s, pred_y, 1);
769 
770  if (my >= 0xffff)
771  return SLICE_ERROR;
772  s->mv[0][0][0] = mx;
773  s->mv[0][0][1] = my;
774 
775  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
776  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
777  } else {
778  s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
779  s->mv_type = MV_TYPE_8X8;
780  for(i=0;i<4;i++) {
781  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
782  if (s->umvplus)
783  mx = h263p_decode_umotion(s, pred_x);
784  else
785  mx = ff_h263_decode_motion(s, pred_x, 1);
786  if (mx >= 0xffff)
787  return SLICE_ERROR;
788 
789  if (s->umvplus)
790  my = h263p_decode_umotion(s, pred_y);
791  else
792  my = ff_h263_decode_motion(s, pred_y, 1);
793  if (my >= 0xffff)
794  return SLICE_ERROR;
795  s->mv[0][i][0] = mx;
796  s->mv[0][i][1] = my;
797  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
798  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
799  mot_val[0] = mx;
800  mot_val[1] = my;
801  }
802  }
803  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
804  int mb_type;
805  const int stride= s->b8_stride;
806  int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
807  int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
808 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
809 
810  //FIXME ugly
811  mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
812  mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
813  mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
814  mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
815 
816  do{
818  if (mb_type < 0){
819  av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
820  return SLICE_ERROR;
821  }
822 
823  mb_type= h263_mb_type_b_map[ mb_type ];
824  }while(!mb_type);
825 
826  s->mb_intra = IS_INTRA(mb_type);
827  if(HAS_CBP(mb_type)){
828  s->bdsp.clear_blocks(s->block[0]);
829  cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
830  if(s->mb_intra){
831  dquant = IS_QUANT(mb_type);
832  goto intra;
833  }
834 
835  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
836 
837  if (cbpy < 0){
838  av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
839  return SLICE_ERROR;
840  }
841 
842  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
843  cbpy ^= 0xF;
844 
845  cbp = (cbpc & 3) | (cbpy << 2);
846  }else
847  cbp=0;
848 
849  av_assert2(!s->mb_intra);
850 
851  if(IS_QUANT(mb_type)){
853  }
854 
855  if(IS_DIRECT(mb_type)){
857  mb_type |= set_direct_mv(s);
858  }else{
859  s->mv_dir = 0;
860  s->mv_type= MV_TYPE_16X16;
861 //FIXME UMV
862 
863  if(USES_LIST(mb_type, 0)){
864  int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
865  s->mv_dir = MV_DIR_FORWARD;
866 
867  if (s->umvplus)
868  mx = h263p_decode_umotion(s, pred_x);
869  else
870  mx = ff_h263_decode_motion(s, pred_x, 1);
871  if (mx >= 0xffff)
872  return SLICE_ERROR;
873 
874  if (s->umvplus)
875  my = h263p_decode_umotion(s, pred_y);
876  else
877  my = ff_h263_decode_motion(s, pred_y, 1);
878  if (my >= 0xffff)
879  return SLICE_ERROR;
880 
881  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
882  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
883 
884  s->mv[0][0][0] = mx;
885  s->mv[0][0][1] = my;
886  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
887  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
888  }
889 
890  if(USES_LIST(mb_type, 1)){
891  int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
892  s->mv_dir |= MV_DIR_BACKWARD;
893 
894  if (s->umvplus)
895  mx = h263p_decode_umotion(s, pred_x);
896  else
897  mx = ff_h263_decode_motion(s, pred_x, 1);
898  if (mx >= 0xffff)
899  return SLICE_ERROR;
900 
901  if (s->umvplus)
902  my = h263p_decode_umotion(s, pred_y);
903  else
904  my = ff_h263_decode_motion(s, pred_y, 1);
905  if (my >= 0xffff)
906  return SLICE_ERROR;
907 
908  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
909  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
910 
911  s->mv[1][0][0] = mx;
912  s->mv[1][0][1] = my;
913  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
914  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
915  }
916  }
917 
918  s->current_picture.mb_type[xy] = mb_type;
919  } else { /* I-Frame */
920  do{
922  if (cbpc < 0){
923  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
924  return SLICE_ERROR;
925  }
926  }while(cbpc == 8);
927 
928  s->bdsp.clear_blocks(s->block[0]);
929 
930  dquant = cbpc & 4;
931  s->mb_intra = 1;
932 intra:
933  s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
934  if (s->h263_aic) {
935  s->ac_pred = get_bits1(&s->gb);
936  if(s->ac_pred){
937  s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
938 
939  s->h263_aic_dir = get_bits1(&s->gb);
940  }
941  }else
942  s->ac_pred = 0;
943 
944  if(s->pb_frame && get_bits1(&s->gb))
945  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
946  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
947  if(cbpy<0){
948  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
949  return SLICE_ERROR;
950  }
951  cbp = (cbpc & 3) | (cbpy << 2);
952  if (dquant) {
954  }
955 
956  pb_mv_count += !!s->pb_frame;
957  }
958 
959  while(pb_mv_count--){
960  ff_h263_decode_motion(s, 0, 1);
961  ff_h263_decode_motion(s, 0, 1);
962  }
963 
964  /* decode each block */
965  for (i = 0; i < 6; i++) {
966  if (h263_decode_block(s, block[i], i, cbp&32) < 0)
967  return -1;
968  cbp+=cbp;
969  }
970 
971  if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
972  return -1;
973  if(s->obmc && !s->mb_intra){
974  if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
975  preview_obmc(s);
976  }
977 end:
978 
979  if (get_bits_left(&s->gb) < 0)
980  return AVERROR_INVALIDDATA;
981 
982  /* per-MB end of slice check */
983  {
984  int v= show_bits(&s->gb, 16);
985 
986  if (get_bits_left(&s->gb) < 16) {
987  v >>= 16 - get_bits_left(&s->gb);
988  }
989 
990  if(v==0)
991  return SLICE_END;
992  }
993 
994  return SLICE_OK;
995 }
996 
997 /* Most is hardcoded; should extend to handle all H.263 streams. */
999 {
1000  int format, width, height, i, ret;
1001  uint32_t startcode;
1002 
1003  align_get_bits(&s->gb);
1004 
1005  if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
1006  av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
1007  }
1008 
1009  startcode= get_bits(&s->gb, 22-8);
1010 
1011  for(i= get_bits_left(&s->gb); i>24; i-=8) {
1012  startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
1013 
1014  if(startcode == 0x20)
1015  break;
1016  }
1017 
1018  if (startcode != 0x20) {
1019  av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
1020  return -1;
1021  }
1022  /* temporal reference */
1023  i = get_bits(&s->gb, 8); /* picture timestamp */
1024 
1025  i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
1026 
1027  s->picture_number= (s->picture_number&~0xFF) + i;
1028 
1029  /* PTYPE starts here */
1030  if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
1031  return -1;
1032  }
1033  if (get_bits1(&s->gb) != 0) {
1034  av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
1035  return -1; /* H.263 id */
1036  }
1037  skip_bits1(&s->gb); /* split screen off */
1038  skip_bits1(&s->gb); /* camera off */
1039  skip_bits1(&s->gb); /* freeze picture release off */
1040 
1041  format = get_bits(&s->gb, 3);
1042  /*
1043  0 forbidden
1044  1 sub-QCIF
1045  10 QCIF
1046  7 extended PTYPE (PLUSPTYPE)
1047  */
1048 
1049  if (format != 7 && format != 6) {
1050  s->h263_plus = 0;
1051  /* H.263v1 */
1052  width = ff_h263_format[format][0];
1054  if (!width)
1055  return -1;
1056 
1057  s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
1058 
1059  s->h263_long_vectors = get_bits1(&s->gb);
1060 
1061  if (get_bits1(&s->gb) != 0) {
1062  av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
1063  return -1; /* SAC: off */
1064  }
1065  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1066  s->unrestricted_mv = s->h263_long_vectors || s->obmc;
1067 
1068  s->pb_frame = get_bits1(&s->gb);
1069  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
1070  skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
1071 
1072  s->width = width;
1073  s->height = height;
1074  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1075  s->avctx->framerate = (AVRational){ 30000, 1001 };
1076  } else {
1077  int ufep;
1078 
1079  /* H.263v2 */
1080  s->h263_plus = 1;
1081  ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
1082 
1083  /* ufep other than 0 and 1 are reserved */
1084  if (ufep == 1) {
1085  /* OPPTYPE */
1086  format = get_bits(&s->gb, 3);
1087  ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
1088  s->custom_pcf= get_bits1(&s->gb);
1089  s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
1090  if (get_bits1(&s->gb) != 0) {
1091  av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
1092  }
1093  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1094  s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
1095  s->loop_filter= get_bits1(&s->gb);
1096  s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
1097  if(s->avctx->lowres)
1098  s->loop_filter = 0;
1099 
1100  s->h263_slice_structured= get_bits1(&s->gb);
1101  if (get_bits1(&s->gb) != 0) {
1102  av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
1103  }
1104  if (get_bits1(&s->gb) != 0) {
1105  av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
1106  }
1107  s->alt_inter_vlc= get_bits1(&s->gb);
1108  s->modified_quant= get_bits1(&s->gb);
1109  if(s->modified_quant)
1110  s->chroma_qscale_table= ff_h263_chroma_qscale_table;
1111 
1112  skip_bits(&s->gb, 1); /* Prevent start code emulation */
1113 
1114  skip_bits(&s->gb, 3); /* Reserved */
1115  } else if (ufep != 0) {
1116  av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
1117  return -1;
1118  }
1119 
1120  /* MPPTYPE */
1121  s->pict_type = get_bits(&s->gb, 3);
1122  switch(s->pict_type){
1123  case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
1124  case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
1125  case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
1126  case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
1127  case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
1128  default:
1129  return -1;
1130  }
1131  skip_bits(&s->gb, 2);
1132  s->no_rounding = get_bits1(&s->gb);
1133  skip_bits(&s->gb, 4);
1134 
1135  /* Get the picture dimensions */
1136  if (ufep) {
1137  if (format == 6) {
1138  /* Custom Picture Format (CPFMT) */
1139  s->aspect_ratio_info = get_bits(&s->gb, 4);
1140  ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1141  /* aspect ratios:
1142  0 - forbidden
1143  1 - 1:1
1144  2 - 12:11 (CIF 4:3)
1145  3 - 10:11 (525-type 4:3)
1146  4 - 16:11 (CIF 16:9)
1147  5 - 40:33 (525-type 16:9)
1148  6-14 - reserved
1149  */
1150  width = (get_bits(&s->gb, 9) + 1) * 4;
1151  check_marker(s->avctx, &s->gb, "in dimensions");
1152  height = get_bits(&s->gb, 9) * 4;
1153  ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1154  if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1155  /* expected dimensions */
1156  s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1157  s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1158  }else{
1159  s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1160  }
1161  } else {
1162  width = ff_h263_format[format][0];
1164  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1165  }
1166  s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;
1167  if ((width == 0) || (height == 0))
1168  return -1;
1169  s->width = width;
1170  s->height = height;
1171 
1172  if(s->custom_pcf){
1173  int gcd;
1174  s->avctx->framerate.num = 1800000;
1175  s->avctx->framerate.den = 1000 + get_bits1(&s->gb);
1176  s->avctx->framerate.den *= get_bits(&s->gb, 7);
1177  if(s->avctx->framerate.den == 0){
1178  av_log(s, AV_LOG_ERROR, "zero framerate\n");
1179  return -1;
1180  }
1181  gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1182  s->avctx->framerate.den /= gcd;
1183  s->avctx->framerate.num /= gcd;
1184  }else{
1185  s->avctx->framerate = (AVRational){ 30000, 1001 };
1186  }
1187  }
1188 
1189  if(s->custom_pcf){
1190  skip_bits(&s->gb, 2); //extended Temporal reference
1191  }
1192 
1193  if (ufep) {
1194  if (s->umvplus) {
1195  if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1196  skip_bits1(&s->gb);
1197  }
1198  if(s->h263_slice_structured){
1199  if (get_bits1(&s->gb) != 0) {
1200  av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1201  }
1202  if (get_bits1(&s->gb) != 0) {
1203  av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1204  }
1205  }
1206  if (s->pict_type == AV_PICTURE_TYPE_B) {
1207  skip_bits(&s->gb, 4); //ELNUM
1208  if (ufep == 1) {
1209  skip_bits(&s->gb, 4); // RLNUM
1210  }
1211  }
1212  }
1213 
1214  s->qscale = get_bits(&s->gb, 5);
1215  }
1216 
1217  if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1218  return ret;
1219 
1220  if (!(s->avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1221  if ((s->width * s->height / 256 / 8) > get_bits_left(&s->gb))
1222  return AVERROR_INVALIDDATA;
1223  }
1224 
1225  s->mb_width = (s->width + 15) / 16;
1226  s->mb_height = (s->height + 15) / 16;
1227  s->mb_num = s->mb_width * s->mb_height;
1228 
1229  if (s->pb_frame) {
1230  skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1231  if (s->custom_pcf)
1232  skip_bits(&s->gb, 2); //extended Temporal reference
1233  skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1234  }
1235 
1236  if (s->pict_type!=AV_PICTURE_TYPE_B) {
1237  s->time = s->picture_number;
1238  s->pp_time = s->time - s->last_non_b_time;
1239  s->last_non_b_time = s->time;
1240  }else{
1241  s->time = s->picture_number;
1242  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1243  if (s->pp_time <=s->pb_time ||
1244  s->pp_time <= s->pp_time - s->pb_time ||
1245  s->pp_time <= 0){
1246  s->pp_time = 2;
1247  s->pb_time = 1;
1248  }
1250  }
1251 
1252  /* PEI */
1253  if (skip_1stop_8data_bits(&s->gb) < 0)
1254  return AVERROR_INVALIDDATA;
1255 
1256  if(s->h263_slice_structured){
1257  if (check_marker(s->avctx, &s->gb, "SEPB1") != 1) {
1258  return -1;
1259  }
1260 
1262 
1263  if (check_marker(s->avctx, &s->gb, "SEPB2") != 1) {
1264  return -1;
1265  }
1266  }
1267  s->f_code = 1;
1268 
1269  if (s->pict_type == AV_PICTURE_TYPE_B)
1270  s->low_delay = 0;
1271 
1272  if(s->h263_aic){
1273  s->y_dc_scale_table=
1274  s->c_dc_scale_table= ff_aic_dc_scale_table;
1275  }else{
1276  s->y_dc_scale_table=
1277  s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
1278  }
1279 
1281  if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
1282  int i,j;
1283  for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1284  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1285  for(i=0; i<13; i++){
1286  for(j=0; j<3; j++){
1287  int v= get_bits(&s->gb, 8);
1288  v |= get_sbits(&s->gb, 8) * (1 << 8);
1289  av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1290  }
1291  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1292  }
1293  for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1294  }
1295 
1296  return 0;
1297 }
static double val(void *priv, double ch)
Definition: aeval.c:76
static const char *const format[]
Definition: af_aiir.c:456
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:88
uint8_t
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
Libavcodec external API header.
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:1654
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:1660
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1624
#define AV_RL32
Definition: intreadwrite.h:146
#define s(width, name)
Definition: cbs_vp9.c:257
#define FFMIN(a, b)
Definition: common.h:105
#define CONFIG_MPEG4_DECODER
Definition: config.h:871
#define CONFIG_FLV_DECODER
Definition: config.h:812
#define CONFIG_RV10_DECODER
Definition: config.h:932
float re
Definition: fft.c:82
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:602
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:180
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:359
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:797
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:854
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:738
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:538
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:185
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:612
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:693
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
#define AV_CODEC_FLAG2_CHUNKS
Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
Definition: avcodec.h:367
@ AV_CODEC_ID_RV10
Definition: codec_id.h:54
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:61
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
int64_t av_gcd(int64_t a, int64_t b)
Compute the greatest common divisor of two integer operands.
Definition: mathematics.c:37
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:317
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:88
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
void ff_h263_pred_acdc(MpegEncContext *s, int16_t *block, int n)
Definition: h263.c:220
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:307
#define FF_ASPECT_EXTENDED
Definition: h263.h:30
#define CBPY_VLC_BITS
Definition: h263.h:40
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:38
#define H263_MV_VLC_BITS
Definition: h263.h:37
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:39
av_cold void ff_h263_init_rl_inter(void)
Definition: h263data.c:300
const uint8_t ff_mba_length[7]
Definition: h263data.c:271
const uint8_t ff_h263_mbtype_b_tab[15][2]
Definition: h263data.c:59
RLTable ff_rl_intra_aic
Definition: h263data.c:230
RLTable ff_h263_rl_inter
Definition: h263data.c:161
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.c:247
const uint8_t ff_cbpc_b_tab[4][2]
Definition: h263data.c:77
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
const uint8_t ff_h263_intra_MCBPC_bits[9]
Definition: h263data.c:35
const uint8_t ff_h263_chroma_qscale_table[32]
Definition: h263data.c:262
const uint8_t ff_h263_inter_MCBPC_code[28]
Definition: h263data.c:40
const uint8_t ff_mvtab[33][2]
Definition: h263data.c:90
const uint8_t ff_h263_inter_MCBPC_bits[28]
Definition: h263data.c:49
const uint8_t ff_modified_quant_tab[2][32]
Definition: h263data.c:252
const uint16_t ff_mba_max[6]
Definition: h263data.c:267
const uint8_t ff_h263_intra_MCBPC_code[9]
Definition: h263data.c:34
const uint8_t ff_h263_cbpy_tab[16][2]
Definition: h263data.c:84
const uint16_t ff_h263_format[8][2]
Definition: h263data.c:238
H.263 tables.
#define IS_INTRA(x, y)
misc image utilities
int i
Definition: input.c:407
static VLC h263_mbtype_b_vlc
Definition: ituh263dec.c:102
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:138
static void preview_obmc(MpegEncContext *s)
read the next MVs for OBMC.
Definition: ituh263dec.c:337
#define tab_size
Definition: ituh263dec.c:629
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
static int set_direct_mv(MpegEncContext *s)
Definition: ituh263dec.c:659
#define CBPC_B_VLC_BITS
Definition: ituh263dec.c:56
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
Definition: ituh263dec.c:212
void ff_h263_show_pict_info(MpegEncContext *s)
Print picture info if FF_DEBUG_PICT_INFO is set.
Definition: ituh263dec.c:76
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:269
static int h263p_decode_umotion(MpegEncContext *s, int pred)
Definition: ituh263dec.c:307
static void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
Definition: ituh263dec.c:631
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:696
#define H263_MBTYPE_B_VLC_BITS
Definition: ituh263dec.c:55
#define tab_bias
Definition: ituh263dec.c:630
static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
Definition: ituh263dec.c:611
static const int h263_mb_type_b_map[15]
Definition: ituh263dec.c:58
static int h263_skip_b_part(MpegEncContext *s, int cbp)
Definition: ituh263dec.c:589
VLC ff_h263_mv_vlc
Definition: ituh263dec.c:101
av_cold void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:108
static VLC cbpc_b_vlc
Definition: ituh263dec.c:103
static int h263_decode_gob_header(MpegEncContext *s)
Decode the group of blocks header or slice header.
Definition: ituh263dec.c:156
static void h263_decode_dquant(MpegEncContext *s)
Definition: ituh263dec.c:429
static int h263_decode_block(MpegEncContext *s, int16_t *block, int n, int coded)
Definition: ituh263dec.c:442
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:998
static const int8_t mv[256][2]
Definition: 4xm.c:78
#define TEX_VLC_BITS
Definition: dv.h:99
#define ff_tlog(ctx,...)
Definition: internal.h:91
FLV common header.
common internal API header
int stride
Definition: mace.c:144
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
#define LOCAL_ALIGNED_32(t, v,...)
Definition: mem_internal.h:136
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.
#define MB_TYPE_CBP
Definition: mpegutils.h:71
#define MB_TYPE_8x8
Definition: mpegutils.h:57
#define MB_TYPE_QUANT
Definition: mpegutils.h:70
#define MB_TYPE_INTRA4x4
Definition: mpegutils.h:51
#define IS_DIRECT(a)
Definition: mpegutils.h:84
#define MB_TYPE_SKIP
Definition: mpegutils.h:62
#define MB_TYPE_L1
Definition: mpegutils.h:68
#define HAS_CBP(a)
Definition: mpegutils.h:101
#define MB_TYPE_INTRA
Definition: mpegutils.h:73
#define MB_TYPE_L0L1
Definition: mpegutils.h:69
#define MB_TYPE_DIRECT2
Definition: mpegutils.h:59
#define USES_LIST(a, list)
Definition: mpegutils.h:99
#define IS_8X8(a)
Definition: mpegutils.h:89
#define MB_TYPE_16x16
Definition: mpegutils.h:54
#define MB_TYPE_ACPRED
Definition: mpegutils.h:60
#define MB_TYPE_L0
Definition: mpegutils.h:67
#define IS_QUANT(a)
Definition: mpegutils.h:95
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2331
mpegvideo header.
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:263
#define SLICE_START_CODE
Definition: mpegvideo.h:75
#define SLICE_END
end marker found
Definition: mpegvideo.h:523
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:267
#define SLICE_OK
Definition: mpegvideo.h:521
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4)
Definition: mpegvideo.h:264
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
#define SLICE_ERROR
Definition: mpegvideo.h:522
const uint8_t ff_mpeg1_dc_scale_table[128]
Definition: mpegvideodata.c:33
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:58
#define INIT_FIRST_VLC_RL(rl, static_size)
Definition: rl.h:71
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:81
static const float pred[4]
Definition: siprdata.h:259
static int shift(int a, int b)
Definition: sonic.c:82
const uint8_t * code
Definition: spdifenc.c:413
unsigned int pos
Definition: spdifenc.c:412
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:401
Rational number (pair of numerator and denominator).
Definition: rational.h:58
MpegEncContext.
Definition: mpegvideo.h:81
Picture.
Definition: mpegpicture.h:45
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
struct AVFrame * f
Definition: mpegpicture.h:46
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
RLTable.
Definition: rl.h:39
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
Definition: vlc.h:26
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
uint8_t run
Definition: svq3.c:205
uint8_t level
Definition: svq3.c:206
#define ff_dlog(a,...)
#define avpriv_request_sample(...)
#define av_log(a,...)
static int16_t block[64]
Definition: dct.c:116
#define height
#define width
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
static av_always_inline int diff(const uint32_t a, const uint32_t b)
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:120
static double c[64]