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ituh263dec.c
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1 /*
2  * ITU H.263 bitstream decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * H.263+ support.
5  * Copyright (c) 2001 Juan J. Sierralta P
6  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7  *
8  * This file is part of 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 "avcodec.h"
38 #include "mpegvideo.h"
39 #include "h263.h"
40 #include "h263data.h"
41 #include "internal.h"
42 #include "mathops.h"
43 #include "mpegutils.h"
44 #include "unary.h"
45 #include "flv.h"
46 #include "rv10.h"
47 #include "mpeg4video.h"
48 #include "mpegvideodata.h"
49 
50 // The defines below define the number of bits that are read at once for
51 // reading vlc values. Changing these may improve speed and data cache needs
52 // be aware though that decreasing them may need the number of stages that is
53 // passed to get_vlc* to be increased.
54 #define MV_VLC_BITS 9
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 
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",
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" : "",
91  );
92  }
93 }
94 
95 /***********************************************/
96 /* decoding */
97 
101 static VLC mv_vlc;
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) {
113  INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
115  ff_h263_intra_MCBPC_code, 1, 1, 72);
116  INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
118  ff_h263_inter_MCBPC_code, 1, 1, 198);
119  INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
120  &ff_h263_cbpy_tab[0][1], 2, 1,
121  &ff_h263_cbpy_tab[0][0], 2, 1, 64);
122  INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
123  &ff_mvtab[0][1], 2, 1,
124  &ff_mvtab[0][0], 2, 1, 538);
129  INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
130  &ff_h263_mbtype_b_tab[0][1], 2, 1,
131  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
132  INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
133  &ff_cbpc_b_tab[0][1], 2, 1,
134  &ff_cbpc_b_tab[0][0], 2, 1, 8);
135  done = 1;
136  }
137 }
138 
140 {
141  int i, mb_pos;
142 
143  for (i = 0; i < 6; i++)
144  if (s->mb_num - 1 <= ff_mba_max[i])
145  break;
146  mb_pos = get_bits(&s->gb, ff_mba_length[i]);
147  s->mb_x = mb_pos % s->mb_width;
148  s->mb_y = mb_pos / s->mb_width;
149 
150  return mb_pos;
151 }
152 
153 /**
154  * Decode the group of blocks header or slice header.
155  * @return <0 if an error occurred
156  */
158 {
159  unsigned int val, gob_number;
160  int left;
161 
162  /* Check for GOB Start Code */
163  val = show_bits(&s->gb, 16);
164  if(val)
165  return -1;
166 
167  /* We have a GBSC probably with GSTUFF */
168  skip_bits(&s->gb, 16); /* Drop the zeros */
169  left= get_bits_left(&s->gb);
170  left = FFMIN(left, 32);
171  //MN: we must check the bits left or we might end in an infinite loop (or segfault)
172  for(;left>13; left--){
173  if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
174  }
175  if(left<=13)
176  return -1;
177 
178  if(s->h263_slice_structured){
179  if(check_marker(s->avctx, &s->gb, "before MBA")==0)
180  return -1;
181 
183 
184  if(s->mb_num > 1583)
185  if(check_marker(s->avctx, &s->gb, "after MBA")==0)
186  return -1;
187 
188  s->qscale = get_bits(&s->gb, 5); /* SQUANT */
189  if(check_marker(s->avctx, &s->gb, "after SQUANT")==0)
190  return -1;
191  skip_bits(&s->gb, 2); /* GFID */
192  }else{
193  gob_number = get_bits(&s->gb, 5); /* GN */
194  s->mb_x= 0;
195  s->mb_y= s->gob_index* gob_number;
196  skip_bits(&s->gb, 2); /* GFID */
197  s->qscale = get_bits(&s->gb, 5); /* GQUANT */
198  }
199 
200  if(s->mb_y >= s->mb_height)
201  return -1;
202 
203  if(s->qscale==0)
204  return -1;
205 
206  return 0;
207 }
208 
209 /**
210  * Decode the group of blocks / video packet header.
211  * @return bit position of the resync_marker, or <0 if none was found
212  */
214  int left, pos, ret;
215 
216  if(s->codec_id==AV_CODEC_ID_MPEG4){
217  skip_bits1(&s->gb);
218  align_get_bits(&s->gb);
219  }
220 
221  if(show_bits(&s->gb, 16)==0){
222  pos= get_bits_count(&s->gb);
223  if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
225  else
226  ret= h263_decode_gob_header(s);
227  if(ret>=0)
228  return pos;
229  }
230  //OK, it's not where it is supposed to be ...
231  s->gb= s->last_resync_gb;
232  align_get_bits(&s->gb);
233  left= get_bits_left(&s->gb);
234 
235  for(;left>16+1+5+5; left-=8){
236  if(show_bits(&s->gb, 16)==0){
237  GetBitContext bak= s->gb;
238 
239  pos= get_bits_count(&s->gb);
240  if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
242  else
243  ret= h263_decode_gob_header(s);
244  if(ret>=0)
245  return pos;
246 
247  s->gb= bak;
248  }
249  skip_bits(&s->gb, 8);
250  }
251 
252  return -1;
253 }
254 
256 {
257  int code, val, sign, shift;
258  code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
259 
260  if (code == 0)
261  return pred;
262  if (code < 0)
263  return 0xffff;
264 
265  sign = get_bits1(&s->gb);
266  shift = f_code - 1;
267  val = code;
268  if (shift) {
269  val = (val - 1) << shift;
270  val |= get_bits(&s->gb, shift);
271  val++;
272  }
273  if (sign)
274  val = -val;
275  val += pred;
276 
277  /* modulo decoding */
278  if (!s->h263_long_vectors) {
279  val = sign_extend(val, 5 + f_code);
280  } else {
281  /* horrible H.263 long vector mode */
282  if (pred < -31 && val < -63)
283  val += 64;
284  if (pred > 32 && val > 63)
285  val -= 64;
286 
287  }
288  return val;
289 }
290 
291 
292 /* Decode RVLC of H.263+ UMV */
294 {
295  int code = 0, sign;
296 
297  if (get_bits1(&s->gb)) /* Motion difference = 0 */
298  return pred;
299 
300  code = 2 + get_bits1(&s->gb);
301 
302  while (get_bits1(&s->gb))
303  {
304  code <<= 1;
305  code += get_bits1(&s->gb);
306  }
307  sign = code & 1;
308  code >>= 1;
309 
310  code = (sign) ? (pred - code) : (pred + code);
311  ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
312  return code;
313 
314 }
315 
316 /**
317  * read the next MVs for OBMC. yes this is an ugly hack, feel free to send a patch :)
318  */
320  GetBitContext gb= s->gb;
321 
322  int cbpc, i, pred_x, pred_y, mx, my;
323  int16_t *mot_val;
324  const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
325  const int stride= s->b8_stride*2;
326 
327  for(i=0; i<4; i++)
328  s->block_index[i]+= 2;
329  for(i=4; i<6; i++)
330  s->block_index[i]+= 1;
331  s->mb_x++;
332 
334 
335  do{
336  if (get_bits1(&s->gb)) {
337  /* skip mb */
338  mot_val = s->current_picture.motion_val[0][s->block_index[0]];
339  mot_val[0 ]= mot_val[2 ]=
340  mot_val[0+stride]= mot_val[2+stride]= 0;
341  mot_val[1 ]= mot_val[3 ]=
342  mot_val[1+stride]= mot_val[3+stride]= 0;
343 
345  goto end;
346  }
347  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
348  }while(cbpc == 20);
349 
350  if(cbpc & 4){
352  }else{
353  get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
354  if (cbpc & 8) {
355  if(s->modified_quant){
356  if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
357  else skip_bits(&s->gb, 5);
358  }else
359  skip_bits(&s->gb, 2);
360  }
361 
362  if ((cbpc & 16) == 0) {
364  /* 16x16 motion prediction */
365  mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
366  if (s->umvplus)
367  mx = h263p_decode_umotion(s, pred_x);
368  else
369  mx = ff_h263_decode_motion(s, pred_x, 1);
370 
371  if (s->umvplus)
372  my = h263p_decode_umotion(s, pred_y);
373  else
374  my = ff_h263_decode_motion(s, pred_y, 1);
375 
376  mot_val[0 ]= mot_val[2 ]=
377  mot_val[0+stride]= mot_val[2+stride]= mx;
378  mot_val[1 ]= mot_val[3 ]=
379  mot_val[1+stride]= mot_val[3+stride]= my;
380  } else {
382  for(i=0;i<4;i++) {
383  mot_val = ff_h263_pred_motion(s, i, 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  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
394  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
395  mot_val[0] = mx;
396  mot_val[1] = my;
397  }
398  }
399  }
400 end:
401 
402  for(i=0; i<4; i++)
403  s->block_index[i]-= 2;
404  for(i=4; i<6; i++)
405  s->block_index[i]-= 1;
406  s->mb_x--;
407 
408  s->gb= gb;
409 }
410 
412  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
413 
414  if(s->modified_quant){
415  if(get_bits1(&s->gb))
417  else
418  s->qscale= get_bits(&s->gb, 5);
419  }else
420  s->qscale += quant_tab[get_bits(&s->gb, 2)];
421  ff_set_qscale(s, s->qscale);
422 }
423 
424 static int h263_decode_block(MpegEncContext * s, int16_t * block,
425  int n, int coded)
426 {
427  int level, i, j, run;
428  RLTable *rl = &ff_h263_rl_inter;
429  const uint8_t *scan_table;
430  GetBitContext gb= s->gb;
431 
432  scan_table = s->intra_scantable.permutated;
433  if (s->h263_aic && s->mb_intra) {
434  rl = &ff_rl_intra_aic;
435  i = 0;
436  if (s->ac_pred) {
437  if (s->h263_aic_dir)
438  scan_table = s->intra_v_scantable.permutated; /* left */
439  else
440  scan_table = s->intra_h_scantable.permutated; /* top */
441  }
442  } else if (s->mb_intra) {
443  /* DC coef */
444  if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
445  if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
446  int component, diff;
447  component = (n <= 3 ? 0 : n - 4 + 1);
448  level = s->last_dc[component];
449  if (s->rv10_first_dc_coded[component]) {
450  diff = ff_rv_decode_dc(s, n);
451  if (diff == 0xffff)
452  return -1;
453  level += diff;
454  level = level & 0xff; /* handle wrap round */
455  s->last_dc[component] = level;
456  } else {
457  s->rv10_first_dc_coded[component] = 1;
458  }
459  } else {
460  level = get_bits(&s->gb, 8);
461  if (level == 255)
462  level = 128;
463  }
464  }else{
465  level = get_bits(&s->gb, 8);
466  if((level&0x7F) == 0){
467  av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
469  return -1;
470  }
471  if (level == 255)
472  level = 128;
473  }
474  block[0] = level;
475  i = 1;
476  } else {
477  i = 0;
478  }
479  if (!coded) {
480  if (s->mb_intra && s->h263_aic)
481  goto not_coded;
482  s->block_last_index[n] = i - 1;
483  return 0;
484  }
485 retry:
486  {
487  OPEN_READER(re, &s->gb);
488  i--; // offset by -1 to allow direct indexing of scan_table
489  for(;;) {
490  UPDATE_CACHE(re, &s->gb);
491  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
492  if (run == 66) {
493  if (level){
494  CLOSE_READER(re, &s->gb);
495  av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
496  return -1;
497  }
498  /* escape */
499  if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
500  int is11 = SHOW_UBITS(re, &s->gb, 1);
501  SKIP_CACHE(re, &s->gb, 1);
502  run = SHOW_UBITS(re, &s->gb, 7) + 1;
503  if (is11) {
504  SKIP_COUNTER(re, &s->gb, 1 + 7);
505  UPDATE_CACHE(re, &s->gb);
506  level = SHOW_SBITS(re, &s->gb, 11);
507  SKIP_COUNTER(re, &s->gb, 11);
508  } else {
509  SKIP_CACHE(re, &s->gb, 7);
510  level = SHOW_SBITS(re, &s->gb, 7);
511  SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
512  }
513  } else {
514  run = SHOW_UBITS(re, &s->gb, 7) + 1;
515  SKIP_CACHE(re, &s->gb, 7);
516  level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
517  SKIP_COUNTER(re, &s->gb, 7 + 8);
518  if(level == -128){
519  UPDATE_CACHE(re, &s->gb);
520  if (s->codec_id == AV_CODEC_ID_RV10) {
521  /* XXX: should patch encoder too */
522  level = SHOW_SBITS(re, &s->gb, 12);
523  SKIP_COUNTER(re, &s->gb, 12);
524  }else{
525  level = SHOW_UBITS(re, &s->gb, 5);
526  SKIP_CACHE(re, &s->gb, 5);
527  level |= SHOW_SBITS(re, &s->gb, 6)<<5;
528  SKIP_COUNTER(re, &s->gb, 5 + 6);
529  }
530  }
531  }
532  } else {
533  if (SHOW_UBITS(re, &s->gb, 1))
534  level = -level;
535  SKIP_COUNTER(re, &s->gb, 1);
536  }
537  i += run;
538  if (i >= 64){
539  CLOSE_READER(re, &s->gb);
540  // redo update without last flag, revert -1 offset
541  i = i - run + ((run-1)&63) + 1;
542  if (i < 64) {
543  // only last marker, no overrun
544  block[scan_table[i]] = level;
545  break;
546  }
547  if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
548  //Looks like a hack but no, it's the way it is supposed to work ...
549  rl = &ff_rl_intra_aic;
550  i = 0;
551  s->gb= gb;
552  s->bdsp.clear_block(block);
553  goto retry;
554  }
555  av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
556  return -1;
557  }
558  j = scan_table[i];
559  block[j] = level;
560  }
561  }
562 not_coded:
563  if (s->mb_intra && s->h263_aic) {
564  ff_h263_pred_acdc(s, block, n);
565  i = 63;
566  }
567  s->block_last_index[n] = i;
568  return 0;
569 }
570 
571 static int h263_skip_b_part(MpegEncContext *s, int cbp)
572 {
573  LOCAL_ALIGNED_16(int16_t, dblock, [64]);
574  int i, mbi;
575  int bli[6];
576 
577  /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
578  * but real value should be restored in order to be used later (in OBMC condition)
579  */
580  mbi = s->mb_intra;
581  memcpy(bli, s->block_last_index, sizeof(bli));
582  s->mb_intra = 0;
583  for (i = 0; i < 6; i++) {
584  if (h263_decode_block(s, dblock, i, cbp&32) < 0)
585  return -1;
586  cbp+=cbp;
587  }
588  s->mb_intra = mbi;
589  memcpy(s->block_last_index, bli, sizeof(bli));
590  return 0;
591 }
592 
593 static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
594 {
595  int c, mv = 1;
596 
597  if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
598  c = get_bits1(gb);
599  if (pb_frame == 2 && c)
600  mv = !get_bits1(gb);
601  } else { // h.263 Annex M improved PB-frame
602  mv = get_unary(gb, 0, 4) + 1;
603  c = mv & 1;
604  mv = !!(mv & 2);
605  }
606  if(c)
607  *cbpb = get_bits(gb, 6);
608  return mv;
609 }
610 
612  int16_t block[6][64])
613 {
614  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
615  int16_t *mot_val;
616  const int xy= s->mb_x + s->mb_y * s->mb_stride;
617  int cbpb = 0, pb_mv_count = 0;
618 
619  av_assert2(!s->h263_pred);
620 
621  if (s->pict_type == AV_PICTURE_TYPE_P) {
622  do{
623  if (get_bits1(&s->gb)) {
624  /* skip mb */
625  s->mb_intra = 0;
626  for(i=0;i<6;i++)
627  s->block_last_index[i] = -1;
628  s->mv_dir = MV_DIR_FORWARD;
629  s->mv_type = MV_TYPE_16X16;
631  s->mv[0][0][0] = 0;
632  s->mv[0][0][1] = 0;
633  s->mb_skipped = !(s->obmc | s->loop_filter);
634  goto end;
635  }
636  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
637  if (cbpc < 0){
638  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
639  return -1;
640  }
641  }while(cbpc == 20);
642 
643  s->bdsp.clear_blocks(s->block[0]);
644 
645  dquant = cbpc & 8;
646  s->mb_intra = ((cbpc & 4) != 0);
647  if (s->mb_intra) goto intra;
648 
649  if(s->pb_frame && get_bits1(&s->gb))
650  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
651  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
652 
653  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
654  cbpy ^= 0xF;
655 
656  cbp = (cbpc & 3) | (cbpy << 2);
657  if (dquant) {
659  }
660 
661  s->mv_dir = MV_DIR_FORWARD;
662  if ((cbpc & 16) == 0) {
664  /* 16x16 motion prediction */
665  s->mv_type = MV_TYPE_16X16;
666  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
667  if (s->umvplus)
668  mx = h263p_decode_umotion(s, pred_x);
669  else
670  mx = ff_h263_decode_motion(s, pred_x, 1);
671 
672  if (mx >= 0xffff)
673  return -1;
674 
675  if (s->umvplus)
676  my = h263p_decode_umotion(s, pred_y);
677  else
678  my = ff_h263_decode_motion(s, pred_y, 1);
679 
680  if (my >= 0xffff)
681  return -1;
682  s->mv[0][0][0] = mx;
683  s->mv[0][0][1] = my;
684 
685  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
686  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
687  } else {
689  s->mv_type = MV_TYPE_8X8;
690  for(i=0;i<4;i++) {
691  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
692  if (s->umvplus)
693  mx = h263p_decode_umotion(s, pred_x);
694  else
695  mx = ff_h263_decode_motion(s, pred_x, 1);
696  if (mx >= 0xffff)
697  return -1;
698 
699  if (s->umvplus)
700  my = h263p_decode_umotion(s, pred_y);
701  else
702  my = ff_h263_decode_motion(s, pred_y, 1);
703  if (my >= 0xffff)
704  return -1;
705  s->mv[0][i][0] = mx;
706  s->mv[0][i][1] = my;
707  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
708  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
709  mot_val[0] = mx;
710  mot_val[1] = my;
711  }
712  }
713  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
714  int mb_type;
715  const int stride= s->b8_stride;
716  int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
717  int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
718 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
719 
720  //FIXME ugly
721  mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
722  mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
723  mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
724  mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
725 
726  do{
727  mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
728  if (mb_type < 0){
729  av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
730  return -1;
731  }
732 
733  mb_type= h263_mb_type_b_map[ mb_type ];
734  }while(!mb_type);
735 
736  s->mb_intra = IS_INTRA(mb_type);
737  if(HAS_CBP(mb_type)){
738  s->bdsp.clear_blocks(s->block[0]);
739  cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
740  if(s->mb_intra){
741  dquant = IS_QUANT(mb_type);
742  goto intra;
743  }
744 
745  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
746 
747  if (cbpy < 0){
748  av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
749  return -1;
750  }
751 
752  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
753  cbpy ^= 0xF;
754 
755  cbp = (cbpc & 3) | (cbpy << 2);
756  }else
757  cbp=0;
758 
759  av_assert2(!s->mb_intra);
760 
761  if(IS_QUANT(mb_type)){
763  }
764 
765  if(IS_DIRECT(mb_type)){
767  mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);
768  }else{
769  s->mv_dir = 0;
771 //FIXME UMV
772 
773  if(USES_LIST(mb_type, 0)){
774  int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my);
775  s->mv_dir = MV_DIR_FORWARD;
776 
777  mx = ff_h263_decode_motion(s, mx, 1);
778  my = ff_h263_decode_motion(s, my, 1);
779 
780  s->mv[0][0][0] = mx;
781  s->mv[0][0][1] = my;
782  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
783  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
784  }
785 
786  if(USES_LIST(mb_type, 1)){
787  int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my);
788  s->mv_dir |= MV_DIR_BACKWARD;
789 
790  mx = ff_h263_decode_motion(s, mx, 1);
791  my = ff_h263_decode_motion(s, my, 1);
792 
793  s->mv[1][0][0] = mx;
794  s->mv[1][0][1] = my;
795  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
796  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
797  }
798  }
799 
800  s->current_picture.mb_type[xy] = mb_type;
801  } else { /* I-Frame */
802  do{
803  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
804  if (cbpc < 0){
805  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
806  return -1;
807  }
808  }while(cbpc == 8);
809 
810  s->bdsp.clear_blocks(s->block[0]);
811 
812  dquant = cbpc & 4;
813  s->mb_intra = 1;
814 intra:
816  if (s->h263_aic) {
817  s->ac_pred = get_bits1(&s->gb);
818  if(s->ac_pred){
820 
821  s->h263_aic_dir = get_bits1(&s->gb);
822  }
823  }else
824  s->ac_pred = 0;
825 
826  if(s->pb_frame && get_bits1(&s->gb))
827  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
828  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
829  if(cbpy<0){
830  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
831  return -1;
832  }
833  cbp = (cbpc & 3) | (cbpy << 2);
834  if (dquant) {
836  }
837 
838  pb_mv_count += !!s->pb_frame;
839  }
840 
841  while(pb_mv_count--){
842  ff_h263_decode_motion(s, 0, 1);
843  ff_h263_decode_motion(s, 0, 1);
844  }
845 
846  /* decode each block */
847  for (i = 0; i < 6; i++) {
848  if (h263_decode_block(s, block[i], i, cbp&32) < 0)
849  return -1;
850  cbp+=cbp;
851  }
852 
853  if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
854  return -1;
855  if(s->obmc && !s->mb_intra){
856  if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
857  preview_obmc(s);
858  }
859 end:
860 
861  /* per-MB end of slice check */
862  {
863  int v= show_bits(&s->gb, 16);
864 
865  if (get_bits_left(&s->gb) < 16) {
866  v >>= 16 - get_bits_left(&s->gb);
867  }
868 
869  if(v==0)
870  return SLICE_END;
871  }
872 
873  return SLICE_OK;
874 }
875 
876 /* Most is hardcoded; should extend to handle all H.263 streams. */
878 {
879  int format, width, height, i, ret;
880  uint32_t startcode;
881 
882  align_get_bits(&s->gb);
883 
884  if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
885  av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
886  }
887 
888  startcode= get_bits(&s->gb, 22-8);
889 
890  for(i= get_bits_left(&s->gb); i>24; i-=8) {
891  startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
892 
893  if(startcode == 0x20)
894  break;
895  }
896 
897  if (startcode != 0x20) {
898  av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
899  return -1;
900  }
901  /* temporal reference */
902  i = get_bits(&s->gb, 8); /* picture timestamp */
903  if( (s->picture_number&~0xFF)+i < s->picture_number)
904  i+= 256;
905  s->picture_number= (s->picture_number&~0xFF) + i;
906 
907  /* PTYPE starts here */
908  if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
909  return -1;
910  }
911  if (get_bits1(&s->gb) != 0) {
912  av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
913  return -1; /* H.263 id */
914  }
915  skip_bits1(&s->gb); /* split screen off */
916  skip_bits1(&s->gb); /* camera off */
917  skip_bits1(&s->gb); /* freeze picture release off */
918 
919  format = get_bits(&s->gb, 3);
920  /*
921  0 forbidden
922  1 sub-QCIF
923  10 QCIF
924  7 extended PTYPE (PLUSPTYPE)
925  */
926 
927  if (format != 7 && format != 6) {
928  s->h263_plus = 0;
929  /* H.263v1 */
930  width = ff_h263_format[format][0];
931  height = ff_h263_format[format][1];
932  if (!width)
933  return -1;
934 
936 
937  s->h263_long_vectors = get_bits1(&s->gb);
938 
939  if (get_bits1(&s->gb) != 0) {
940  av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
941  return -1; /* SAC: off */
942  }
943  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
944  s->unrestricted_mv = s->h263_long_vectors || s->obmc;
945 
946  s->pb_frame = get_bits1(&s->gb);
947  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
948  skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
949 
950  s->width = width;
951  s->height = height;
952  s->avctx->sample_aspect_ratio= (AVRational){12,11};
953  s->avctx->framerate = (AVRational){ 30000, 1001 };
954  } else {
955  int ufep;
956 
957  /* H.263v2 */
958  s->h263_plus = 1;
959  ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
960 
961  /* ufep other than 0 and 1 are reserved */
962  if (ufep == 1) {
963  /* OPPTYPE */
964  format = get_bits(&s->gb, 3);
965  ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
966  s->custom_pcf= get_bits1(&s->gb);
967  s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
968  if (get_bits1(&s->gb) != 0) {
969  av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
970  }
971  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
972  s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
973  s->loop_filter= get_bits1(&s->gb);
974  s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
975  if(s->avctx->lowres)
976  s->loop_filter = 0;
977 
979  if (get_bits1(&s->gb) != 0) {
980  av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
981  }
982  if (get_bits1(&s->gb) != 0) {
983  av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
984  }
985  s->alt_inter_vlc= get_bits1(&s->gb);
986  s->modified_quant= get_bits1(&s->gb);
987  if(s->modified_quant)
989 
990  skip_bits(&s->gb, 1); /* Prevent start code emulation */
991 
992  skip_bits(&s->gb, 3); /* Reserved */
993  } else if (ufep != 0) {
994  av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
995  return -1;
996  }
997 
998  /* MPPTYPE */
999  s->pict_type = get_bits(&s->gb, 3);
1000  switch(s->pict_type){
1001  case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
1002  case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
1003  case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
1004  case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
1005  case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
1006  default:
1007  return -1;
1008  }
1009  skip_bits(&s->gb, 2);
1010  s->no_rounding = get_bits1(&s->gb);
1011  skip_bits(&s->gb, 4);
1012 
1013  /* Get the picture dimensions */
1014  if (ufep) {
1015  if (format == 6) {
1016  /* Custom Picture Format (CPFMT) */
1017  s->aspect_ratio_info = get_bits(&s->gb, 4);
1018  ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1019  /* aspect ratios:
1020  0 - forbidden
1021  1 - 1:1
1022  2 - 12:11 (CIF 4:3)
1023  3 - 10:11 (525-type 4:3)
1024  4 - 16:11 (CIF 16:9)
1025  5 - 40:33 (525-type 16:9)
1026  6-14 - reserved
1027  */
1028  width = (get_bits(&s->gb, 9) + 1) * 4;
1029  check_marker(s->avctx, &s->gb, "in dimensions");
1030  height = get_bits(&s->gb, 9) * 4;
1031  ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1033  /* expected dimensions */
1034  s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1035  s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1036  }else{
1038  }
1039  } else {
1040  width = ff_h263_format[format][0];
1041  height = ff_h263_format[format][1];
1042  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1043  }
1045  if ((width == 0) || (height == 0))
1046  return -1;
1047  s->width = width;
1048  s->height = height;
1049 
1050  if(s->custom_pcf){
1051  int gcd;
1052  s->avctx->framerate.num = 1800000;
1053  s->avctx->framerate.den = 1000 + get_bits1(&s->gb);
1054  s->avctx->framerate.den *= get_bits(&s->gb, 7);
1055  if(s->avctx->framerate.den == 0){
1056  av_log(s, AV_LOG_ERROR, "zero framerate\n");
1057  return -1;
1058  }
1059  gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1060  s->avctx->framerate.den /= gcd;
1061  s->avctx->framerate.num /= gcd;
1062  }else{
1063  s->avctx->framerate = (AVRational){ 30000, 1001 };
1064  }
1065  }
1066 
1067  if(s->custom_pcf){
1068  skip_bits(&s->gb, 2); //extended Temporal reference
1069  }
1070 
1071  if (ufep) {
1072  if (s->umvplus) {
1073  if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1074  skip_bits1(&s->gb);
1075  }
1076  if(s->h263_slice_structured){
1077  if (get_bits1(&s->gb) != 0) {
1078  av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1079  }
1080  if (get_bits1(&s->gb) != 0) {
1081  av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1082  }
1083  }
1084  }
1085 
1086  s->qscale = get_bits(&s->gb, 5);
1087  }
1088 
1089  if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1090  return ret;
1091 
1092  s->mb_width = (s->width + 15) / 16;
1093  s->mb_height = (s->height + 15) / 16;
1094  s->mb_num = s->mb_width * s->mb_height;
1095 
1096  if (s->pb_frame) {
1097  skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1098  if (s->custom_pcf)
1099  skip_bits(&s->gb, 2); //extended Temporal reference
1100  skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1101  }
1102 
1103  if (s->pict_type!=AV_PICTURE_TYPE_B) {
1104  s->time = s->picture_number;
1105  s->pp_time = s->time - s->last_non_b_time;
1106  s->last_non_b_time = s->time;
1107  }else{
1108  s->time = s->picture_number;
1109  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1110  if (s->pp_time <=s->pb_time ||
1111  s->pp_time <= s->pp_time - s->pb_time ||
1112  s->pp_time <= 0){
1113  s->pp_time = 2;
1114  s->pb_time = 1;
1115  }
1117  }
1118 
1119  /* PEI */
1120  if (skip_1stop_8data_bits(&s->gb) < 0)
1121  return AVERROR_INVALIDDATA;
1122 
1123  if(s->h263_slice_structured){
1124  if (check_marker(s->avctx, &s->gb, "SEPB1") != 1) {
1125  return -1;
1126  }
1127 
1128  ff_h263_decode_mba(s);
1129 
1130  if (check_marker(s->avctx, &s->gb, "SEPB2") != 1) {
1131  return -1;
1132  }
1133  }
1134  s->f_code = 1;
1135 
1136  if(s->h263_aic){
1137  s->y_dc_scale_table=
1139  }else{
1140  s->y_dc_scale_table=
1142  }
1143 
1145  if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
1146  int i,j;
1147  for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1148  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1149  for(i=0; i<13; i++){
1150  for(j=0; j<3; j++){
1151  int v= get_bits(&s->gb, 8);
1152  v |= get_sbits(&s->gb, 8)<<8;
1153  av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1154  }
1155  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1156  }
1157  for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1158  }
1159 
1160  return 0;
1161 }
av_cold void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:108
int rv10_first_dc_coded[3]
Definition: mpegvideo.h:419
#define ff_tlog(ctx,...)
Definition: internal.h:65
AVRational framerate
Definition: avcodec.h:3376
#define MB_TYPE_SKIP
Definition: avcodec.h:1264
const char const char void * val
Definition: avisynth_c.h:771
int aspect_ratio_info
Definition: mpegvideo.h:400
int picture_number
Definition: mpegvideo.h:124
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ScanTable intra_v_scantable
Definition: mpegvideo.h:90
static int h263_decode_gob_header(MpegEncContext *s)
Decode the group of blocks header or slice header.
Definition: ituh263dec.c:157
static int shift(int a, int b)
Definition: sonic.c:82
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
#define CBPY_VLC_BITS
Definition: h263.h:41
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:185
const uint16_t ff_mba_max[6]
Definition: h263data.c:267
void(* clear_block)(int16_t *block)
Definition: blockdsp.h:35
float re
Definition: fft.c:82
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:57
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:167
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:388
RLTable ff_rl_intra_aic
Definition: h263data.c:230
int num
Numerator.
Definition: rational.h:59
#define MB_TYPE_INTRA4x4
Definition: avcodec.h:1253
enum AVCodecID codec_id
Definition: mpegvideo.h:109
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2980
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
int obmc
overlapped block motion compensation
Definition: mpegvideo.h:366
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:2087
#define MB_TYPE_INTRA
Definition: mpegutils.h:75
static int h263_decode_block(MpegEncContext *s, int16_t *block, int n, int coded)
Definition: ituh263dec.c:424
#define MB_TYPE_QUANT
Definition: avcodec.h:1272
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2974
mpegvideo header.
#define HAS_CBP(a)
Definition: mpegutils.h:103
const uint16_t ff_h263_format[8][2]
Definition: h263data.c:238
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1881
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:206
#define SLICE_OK
Definition: mpegvideo.h:500
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:130
RLTable.
Definition: rl.h:39
int qscale
QP.
Definition: mpegvideo.h:201
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:232
int h263_aic
Advanced INTRA Coding (AIC)
Definition: mpegvideo.h:84
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:309
Macro definitions for various function/variable attributes.
int modified_quant
Definition: mpegvideo.h:379
static int16_t block[64]
Definition: dct.c:113
#define USES_LIST(a, list)
Definition: mpegutils.h:101
int alt_inter_vlc
alternative inter vlc
Definition: mpegvideo.h:378
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:359
int64_t time
time of current frame
Definition: mpegvideo.h:388
const uint8_t ff_mpeg1_dc_scale_table[128]
Definition: mpegvideodata.c:34
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (MPEG-4) ...
Definition: mpegvideo.h:264
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2918
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static VLC h263_mbtype_b_vlc
Definition: ituh263dec.c:102
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:198
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:284
H.263 tables.
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:177
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:358
#define height
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
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:91
#define ff_dlog(a,...)
const uint8_t ff_h263_intra_MCBPC_bits[9]
Definition: h263data.c:35
uint16_t pp_time
time distance between the last 2 p,s,i frames
Definition: mpegvideo.h:390
const uint8_t ff_mba_length[7]
Definition: h263data.c:271
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:126
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:3088
static int h263_skip_b_part(MpegEncContext *s, int cbp)
Definition: ituh263dec.c:571
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:117
#define av_log(a,...)
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2804
const uint8_t ff_h263_mbtype_b_tab[15][2]
Definition: h263data.c:59
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:568
#define H263_MBTYPE_B_VLC_BITS
Definition: ituh263dec.c:55
int h263_plus
H.263+ headers.
Definition: mpegvideo.h:106
uint8_t ff_h263_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: h263data.c:31
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:160
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:182
const uint8_t ff_h263_inter_MCBPC_code[28]
Definition: h263data.c:40
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:192
const uint8_t ff_modified_quant_tab[2][32]
Definition: h263data.c:252
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:220
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:255
#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:58
int h263_slice_structured
Definition: mpegvideo.h:377
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
int64_t av_gcd(int64_t a, int64_t b)
Compute the greatest common divisor of two integer operands.
Definition: mathematics.c:37
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:593
GetBitContext gb
Definition: mpegvideo.h:445
#define CLOSE_READER(name, gb)
Definition: get_bits.h:131
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:490
Definition: vlc.h:26
common internal API header
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:251
const uint8_t ff_h263_inter_MCBPC_bits[28]
Definition: h263data.c:49
const uint8_t ff_h263_chroma_qscale_table[32]
Definition: h263data.c:262
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2965
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1261
#define FFMIN(a, b)
Definition: common.h:96
#define IS_DIRECT(a)
Definition: mpegutils.h:86
int umvplus
== H.263+ && unrestricted_mv
Definition: mpegvideo.h:375
#define width
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
int size_in_bits
Definition: get_bits.h:58
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:282
#define MB_TYPE_L0L1
Definition: avcodec.h:1271
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:535
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
int n
Definition: avisynth_c.h:684
int pb_frame
PB-frame mode (0 = none, 1 = base, 2 = improved)
Definition: mpegvideo.h:103
#define MB_TYPE_ACPRED
Definition: avcodec.h:1262
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define MB_TYPE_L1
Definition: avcodec.h:1270
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:139
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:193
static int h263p_decode_umotion(MpegEncContext *s, int pred)
Definition: ituh263dec.c:293
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:293
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:266
#define MV_VLC_BITS
Definition: ituh263dec.c:54
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.c:247
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:263
int64_t last_non_b_time
Definition: mpegvideo.h:389
Libavcodec external API header.
int h263_flv
use flv H.263 header
Definition: mpegvideo.h:107
BlockDSPContext bdsp
Definition: mpegvideo.h:223
int debug
debug
Definition: avcodec.h:2917
const uint8_t ff_h263_intra_MCBPC_code[9]
Definition: h263data.c:34
ScanTable intra_scantable
Definition: mpegvideo.h:88
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
#define IS_QUANT(a)
Definition: mpegutils.h:97
#define OPEN_READER(name, gb)
Definition: get_bits.h:120
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:39
#define SLICE_END
end marker found
Definition: mpegvideo.h:502
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:324
static const char * format
Definition: movenc.c:47
ScanTable intra_h_scantable
Definition: mpegvideo.h:89
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:292
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define CBPC_B_VLC_BITS
Definition: ituh263dec.c:56
#define MB_TYPE_16x16
Definition: avcodec.h:1256
RLTable ff_h263_rl_inter
Definition: h263data.c:161
static VLC mv_vlc
Definition: ituh263dec.c:101
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:213
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:162
const uint8_t ff_cbpc_b_tab[4][2]
Definition: h263data.c:77
int f_code
forward MV resolution
Definition: mpegvideo.h:235
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:117
const uint8_t ff_h263_cbpy_tab[16][2]
Definition: h263data.c:84
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:877
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:139
static void h263_decode_dquant(MpegEncContext *s)
Definition: ituh263dec.c:411
int h263_pred
use MPEG-4/H.263 ac/dc predictions
Definition: mpegvideo.h:102
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.c:275
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:186
uint8_t level
Definition: svq3.c:207
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:276
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:128
MpegEncContext.
Definition: mpegvideo.h:78
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:194
#define MB_TYPE_CBP
Definition: avcodec.h:1273
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:127
void ff_h263_pred_acdc(MpegEncContext *s, int16_t *block, int n)
Definition: h263.c:222
#define TEX_VLC_BITS
Definition: dv.h:93
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:33
#define MB_TYPE_8x8
Definition: avcodec.h:1259
Bi-dir predicted.
Definition: avutil.h:270
int den
Denominator.
Definition: rational.h:60
const uint8_t * chroma_qscale_table
qscale -> chroma_qscale (H.263)
Definition: mpegvideo.h:187
#define IS_INTRA(x, y)
void * priv_data
Definition: avcodec.h:1718
static av_always_inline int diff(const uint32_t a, const uint32_t b)
static VLC cbpc_b_vlc
Definition: ituh263dec.c:103
void ff_h263_show_pict_info(MpegEncContext *s)
Print picture info if FF_DEBUG_PICT_INFO is set.
Definition: ituh263dec.c:76
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:497
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
static AVCodec * c
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:445
int chroma_qscale
chroma QP
Definition: mpegvideo.h:202
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2469
static void preview_obmc(MpegEncContext *s)
read the next MVs for OBMC.
Definition: ituh263dec.c:319
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
#define LOCAL_ALIGNED_16(t, v,...)
Definition: internal.h:121
int rv10_version
RV10 version: 0 or 3.
Definition: mpegvideo.h:418
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:573
int h263_long_vectors
use horrible H.263v1 long vector mode
Definition: mpegvideo.h:221
#define stride
#define MV_TYPE_8X8
4 vectors (H.263, MPEG-4 4MV)
Definition: mpegvideo.h:267
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:376
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:611
#define MB_TYPE_L0
Definition: avcodec.h:1269
Predicted.
Definition: avutil.h:269
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:39
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:391
const uint8_t ff_mvtab[33][2]
Definition: h263data.c:90