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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) * (1<<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 
611 #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
612 #define tab_bias (tab_size / 2)
613 static inline void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
614 {
615  int xy = s->block_index[i];
616  uint16_t time_pp = s->pp_time;
617  uint16_t time_pb = s->pb_time;
618  int p_mx, p_my;
619 
620  p_mx = p->motion_val[0][xy][0];
621  if ((unsigned)(p_mx + tab_bias) < tab_size) {
622  s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias];
623  s->mv[1][i][0] = s->direct_scale_mv[1][p_mx + tab_bias];
624  } else {
625  s->mv[0][i][0] = p_mx * time_pb / time_pp;
626  s->mv[1][i][0] = p_mx * (time_pb - time_pp) / time_pp;
627  }
628  p_my = p->motion_val[0][xy][1];
629  if ((unsigned)(p_my + tab_bias) < tab_size) {
630  s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias];
631  s->mv[1][i][1] = s->direct_scale_mv[1][p_my + tab_bias];
632  } else {
633  s->mv[0][i][1] = p_my * time_pb / time_pp;
634  s->mv[1][i][1] = p_my * (time_pb - time_pp) / time_pp;
635  }
636 }
637 
638 /**
639  * @return the mb_type
640  */
642 {
643  const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
644  Picture *p = &s->next_picture;
645  int colocated_mb_type = p->mb_type[mb_index];
646  int i;
647 
648  if (s->codec_tag == AV_RL32("U263") && p->f->pict_type == AV_PICTURE_TYPE_I) {
649  p = &s->last_picture;
650  colocated_mb_type = p->mb_type[mb_index];
651  }
652 
653  if (IS_8X8(colocated_mb_type)) {
654  s->mv_type = MV_TYPE_8X8;
655  for (i = 0; i < 4; i++)
656  set_one_direct_mv(s, p, i);
658  } else {
659  set_one_direct_mv(s, p, 0);
660  s->mv[0][1][0] =
661  s->mv[0][2][0] =
662  s->mv[0][3][0] = s->mv[0][0][0];
663  s->mv[0][1][1] =
664  s->mv[0][2][1] =
665  s->mv[0][3][1] = s->mv[0][0][1];
666  s->mv[1][1][0] =
667  s->mv[1][2][0] =
668  s->mv[1][3][0] = s->mv[1][0][0];
669  s->mv[1][1][1] =
670  s->mv[1][2][1] =
671  s->mv[1][3][1] = s->mv[1][0][1];
672  s->mv_type = MV_TYPE_8X8;
673  // Note see prev line
675  }
676 }
677 
679  int16_t block[6][64])
680 {
681  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
682  int16_t *mot_val;
683  const int xy= s->mb_x + s->mb_y * s->mb_stride;
684  int cbpb = 0, pb_mv_count = 0;
685 
686  av_assert2(!s->h263_pred);
687 
688  if (s->pict_type == AV_PICTURE_TYPE_P) {
689  do{
690  if (get_bits1(&s->gb)) {
691  /* skip mb */
692  s->mb_intra = 0;
693  for(i=0;i<6;i++)
694  s->block_last_index[i] = -1;
695  s->mv_dir = MV_DIR_FORWARD;
696  s->mv_type = MV_TYPE_16X16;
698  s->mv[0][0][0] = 0;
699  s->mv[0][0][1] = 0;
700  s->mb_skipped = !(s->obmc | s->loop_filter);
701  goto end;
702  }
703  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
704  if (cbpc < 0){
705  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
706  return SLICE_ERROR;
707  }
708  }while(cbpc == 20);
709 
710  s->bdsp.clear_blocks(s->block[0]);
711 
712  dquant = cbpc & 8;
713  s->mb_intra = ((cbpc & 4) != 0);
714  if (s->mb_intra) goto intra;
715 
716  if(s->pb_frame && get_bits1(&s->gb))
717  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
718  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
719 
720  if (cbpy < 0) {
721  av_log(s->avctx, AV_LOG_ERROR, "cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
722  return SLICE_ERROR;
723  }
724 
725  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
726  cbpy ^= 0xF;
727 
728  cbp = (cbpc & 3) | (cbpy << 2);
729  if (dquant) {
731  }
732 
733  s->mv_dir = MV_DIR_FORWARD;
734  if ((cbpc & 16) == 0) {
736  /* 16x16 motion prediction */
737  s->mv_type = MV_TYPE_16X16;
738  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
739  if (s->umvplus)
740  mx = h263p_decode_umotion(s, pred_x);
741  else
742  mx = ff_h263_decode_motion(s, pred_x, 1);
743 
744  if (mx >= 0xffff)
745  return SLICE_ERROR;
746 
747  if (s->umvplus)
748  my = h263p_decode_umotion(s, pred_y);
749  else
750  my = ff_h263_decode_motion(s, pred_y, 1);
751 
752  if (my >= 0xffff)
753  return SLICE_ERROR;
754  s->mv[0][0][0] = mx;
755  s->mv[0][0][1] = my;
756 
757  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
758  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
759  } else {
761  s->mv_type = MV_TYPE_8X8;
762  for(i=0;i<4;i++) {
763  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
764  if (s->umvplus)
765  mx = h263p_decode_umotion(s, pred_x);
766  else
767  mx = ff_h263_decode_motion(s, pred_x, 1);
768  if (mx >= 0xffff)
769  return SLICE_ERROR;
770 
771  if (s->umvplus)
772  my = h263p_decode_umotion(s, pred_y);
773  else
774  my = ff_h263_decode_motion(s, pred_y, 1);
775  if (my >= 0xffff)
776  return SLICE_ERROR;
777  s->mv[0][i][0] = mx;
778  s->mv[0][i][1] = my;
779  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
780  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
781  mot_val[0] = mx;
782  mot_val[1] = my;
783  }
784  }
785  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
786  int mb_type;
787  const int stride= s->b8_stride;
788  int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
789  int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
790 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
791 
792  //FIXME ugly
793  mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
794  mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
795  mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
796  mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
797 
798  do{
799  mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
800  if (mb_type < 0){
801  av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
802  return SLICE_ERROR;
803  }
804 
805  mb_type= h263_mb_type_b_map[ mb_type ];
806  }while(!mb_type);
807 
808  s->mb_intra = IS_INTRA(mb_type);
809  if(HAS_CBP(mb_type)){
810  s->bdsp.clear_blocks(s->block[0]);
811  cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
812  if(s->mb_intra){
813  dquant = IS_QUANT(mb_type);
814  goto intra;
815  }
816 
817  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
818 
819  if (cbpy < 0){
820  av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
821  return SLICE_ERROR;
822  }
823 
824  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
825  cbpy ^= 0xF;
826 
827  cbp = (cbpc & 3) | (cbpy << 2);
828  }else
829  cbp=0;
830 
831  av_assert2(!s->mb_intra);
832 
833  if(IS_QUANT(mb_type)){
835  }
836 
837  if(IS_DIRECT(mb_type)){
839  mb_type |= set_direct_mv(s);
840  }else{
841  s->mv_dir = 0;
843 //FIXME UMV
844 
845  if(USES_LIST(mb_type, 0)){
846  int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
847  s->mv_dir = MV_DIR_FORWARD;
848 
849  if (s->umvplus)
850  mx = h263p_decode_umotion(s, pred_x);
851  else
852  mx = ff_h263_decode_motion(s, pred_x, 1);
853  if (mx >= 0xffff)
854  return SLICE_ERROR;
855 
856  if (s->umvplus)
857  my = h263p_decode_umotion(s, pred_y);
858  else
859  my = ff_h263_decode_motion(s, pred_y, 1);
860  if (my >= 0xffff)
861  return SLICE_ERROR;
862 
863  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
864  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
865 
866  s->mv[0][0][0] = mx;
867  s->mv[0][0][1] = my;
868  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
869  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
870  }
871 
872  if(USES_LIST(mb_type, 1)){
873  int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
874  s->mv_dir |= MV_DIR_BACKWARD;
875 
876  if (s->umvplus)
877  mx = h263p_decode_umotion(s, pred_x);
878  else
879  mx = ff_h263_decode_motion(s, pred_x, 1);
880  if (mx >= 0xffff)
881  return SLICE_ERROR;
882 
883  if (s->umvplus)
884  my = h263p_decode_umotion(s, pred_y);
885  else
886  my = ff_h263_decode_motion(s, pred_y, 1);
887  if (my >= 0xffff)
888  return SLICE_ERROR;
889 
890  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
891  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
892 
893  s->mv[1][0][0] = mx;
894  s->mv[1][0][1] = my;
895  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
896  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
897  }
898  }
899 
900  s->current_picture.mb_type[xy] = mb_type;
901  } else { /* I-Frame */
902  do{
903  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
904  if (cbpc < 0){
905  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
906  return SLICE_ERROR;
907  }
908  }while(cbpc == 8);
909 
910  s->bdsp.clear_blocks(s->block[0]);
911 
912  dquant = cbpc & 4;
913  s->mb_intra = 1;
914 intra:
916  if (s->h263_aic) {
917  s->ac_pred = get_bits1(&s->gb);
918  if(s->ac_pred){
920 
921  s->h263_aic_dir = get_bits1(&s->gb);
922  }
923  }else
924  s->ac_pred = 0;
925 
926  if(s->pb_frame && get_bits1(&s->gb))
927  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
928  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
929  if(cbpy<0){
930  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
931  return SLICE_ERROR;
932  }
933  cbp = (cbpc & 3) | (cbpy << 2);
934  if (dquant) {
936  }
937 
938  pb_mv_count += !!s->pb_frame;
939  }
940 
941  while(pb_mv_count--){
942  ff_h263_decode_motion(s, 0, 1);
943  ff_h263_decode_motion(s, 0, 1);
944  }
945 
946  /* decode each block */
947  for (i = 0; i < 6; i++) {
948  if (h263_decode_block(s, block[i], i, cbp&32) < 0)
949  return -1;
950  cbp+=cbp;
951  }
952 
953  if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
954  return -1;
955  if(s->obmc && !s->mb_intra){
956  if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
957  preview_obmc(s);
958  }
959 end:
960 
961  /* per-MB end of slice check */
962  {
963  int v= show_bits(&s->gb, 16);
964 
965  if (get_bits_left(&s->gb) < 16) {
966  v >>= 16 - get_bits_left(&s->gb);
967  }
968 
969  if(v==0)
970  return SLICE_END;
971  }
972 
973  return SLICE_OK;
974 }
975 
976 /* Most is hardcoded; should extend to handle all H.263 streams. */
978 {
979  int format, width, height, i, ret;
980  uint32_t startcode;
981 
982  align_get_bits(&s->gb);
983 
984  if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
985  av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
986  }
987 
988  startcode= get_bits(&s->gb, 22-8);
989 
990  for(i= get_bits_left(&s->gb); i>24; i-=8) {
991  startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
992 
993  if(startcode == 0x20)
994  break;
995  }
996 
997  if (startcode != 0x20) {
998  av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
999  return -1;
1000  }
1001  /* temporal reference */
1002  i = get_bits(&s->gb, 8); /* picture timestamp */
1003 
1004  i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
1005 
1006  s->picture_number= (s->picture_number&~0xFF) + i;
1007 
1008  /* PTYPE starts here */
1009  if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
1010  return -1;
1011  }
1012  if (get_bits1(&s->gb) != 0) {
1013  av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
1014  return -1; /* H.263 id */
1015  }
1016  skip_bits1(&s->gb); /* split screen off */
1017  skip_bits1(&s->gb); /* camera off */
1018  skip_bits1(&s->gb); /* freeze picture release off */
1019 
1020  format = get_bits(&s->gb, 3);
1021  /*
1022  0 forbidden
1023  1 sub-QCIF
1024  10 QCIF
1025  7 extended PTYPE (PLUSPTYPE)
1026  */
1027 
1028  if (format != 7 && format != 6) {
1029  s->h263_plus = 0;
1030  /* H.263v1 */
1031  width = ff_h263_format[format][0];
1032  height = ff_h263_format[format][1];
1033  if (!width)
1034  return -1;
1035 
1037 
1038  s->h263_long_vectors = get_bits1(&s->gb);
1039 
1040  if (get_bits1(&s->gb) != 0) {
1041  av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
1042  return -1; /* SAC: off */
1043  }
1044  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1045  s->unrestricted_mv = s->h263_long_vectors || s->obmc;
1046 
1047  s->pb_frame = get_bits1(&s->gb);
1048  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
1049  skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
1050 
1051  s->width = width;
1052  s->height = height;
1053  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1054  s->avctx->framerate = (AVRational){ 30000, 1001 };
1055  } else {
1056  int ufep;
1057 
1058  /* H.263v2 */
1059  s->h263_plus = 1;
1060  ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
1061 
1062  /* ufep other than 0 and 1 are reserved */
1063  if (ufep == 1) {
1064  /* OPPTYPE */
1065  format = get_bits(&s->gb, 3);
1066  ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
1067  s->custom_pcf= get_bits1(&s->gb);
1068  s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
1069  if (get_bits1(&s->gb) != 0) {
1070  av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
1071  }
1072  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1073  s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
1074  s->loop_filter= get_bits1(&s->gb);
1075  s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
1076  if(s->avctx->lowres)
1077  s->loop_filter = 0;
1078 
1080  if (get_bits1(&s->gb) != 0) {
1081  av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
1082  }
1083  if (get_bits1(&s->gb) != 0) {
1084  av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
1085  }
1086  s->alt_inter_vlc= get_bits1(&s->gb);
1087  s->modified_quant= get_bits1(&s->gb);
1088  if(s->modified_quant)
1090 
1091  skip_bits(&s->gb, 1); /* Prevent start code emulation */
1092 
1093  skip_bits(&s->gb, 3); /* Reserved */
1094  } else if (ufep != 0) {
1095  av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
1096  return -1;
1097  }
1098 
1099  /* MPPTYPE */
1100  s->pict_type = get_bits(&s->gb, 3);
1101  switch(s->pict_type){
1102  case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
1103  case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
1104  case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
1105  case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
1106  case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
1107  default:
1108  return -1;
1109  }
1110  skip_bits(&s->gb, 2);
1111  s->no_rounding = get_bits1(&s->gb);
1112  skip_bits(&s->gb, 4);
1113 
1114  /* Get the picture dimensions */
1115  if (ufep) {
1116  if (format == 6) {
1117  /* Custom Picture Format (CPFMT) */
1118  s->aspect_ratio_info = get_bits(&s->gb, 4);
1119  ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1120  /* aspect ratios:
1121  0 - forbidden
1122  1 - 1:1
1123  2 - 12:11 (CIF 4:3)
1124  3 - 10:11 (525-type 4:3)
1125  4 - 16:11 (CIF 16:9)
1126  5 - 40:33 (525-type 16:9)
1127  6-14 - reserved
1128  */
1129  width = (get_bits(&s->gb, 9) + 1) * 4;
1130  check_marker(s->avctx, &s->gb, "in dimensions");
1131  height = get_bits(&s->gb, 9) * 4;
1132  ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1134  /* expected dimensions */
1135  s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1136  s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1137  }else{
1139  }
1140  } else {
1141  width = ff_h263_format[format][0];
1142  height = ff_h263_format[format][1];
1143  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1144  }
1146  if ((width == 0) || (height == 0))
1147  return -1;
1148  s->width = width;
1149  s->height = height;
1150 
1151  if(s->custom_pcf){
1152  int gcd;
1153  s->avctx->framerate.num = 1800000;
1154  s->avctx->framerate.den = 1000 + get_bits1(&s->gb);
1155  s->avctx->framerate.den *= get_bits(&s->gb, 7);
1156  if(s->avctx->framerate.den == 0){
1157  av_log(s, AV_LOG_ERROR, "zero framerate\n");
1158  return -1;
1159  }
1160  gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1161  s->avctx->framerate.den /= gcd;
1162  s->avctx->framerate.num /= gcd;
1163  }else{
1164  s->avctx->framerate = (AVRational){ 30000, 1001 };
1165  }
1166  }
1167 
1168  if(s->custom_pcf){
1169  skip_bits(&s->gb, 2); //extended Temporal reference
1170  }
1171 
1172  if (ufep) {
1173  if (s->umvplus) {
1174  if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1175  skip_bits1(&s->gb);
1176  }
1177  if(s->h263_slice_structured){
1178  if (get_bits1(&s->gb) != 0) {
1179  av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1180  }
1181  if (get_bits1(&s->gb) != 0) {
1182  av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1183  }
1184  }
1185  if (s->pict_type == AV_PICTURE_TYPE_B) {
1186  skip_bits(&s->gb, 4); //ELNUM
1187  if (ufep == 1) {
1188  skip_bits(&s->gb, 4); // RLNUM
1189  }
1190  }
1191  }
1192 
1193  s->qscale = get_bits(&s->gb, 5);
1194  }
1195 
1196  if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1197  return ret;
1198 
1199  s->mb_width = (s->width + 15) / 16;
1200  s->mb_height = (s->height + 15) / 16;
1201  s->mb_num = s->mb_width * s->mb_height;
1202 
1203  if (s->pb_frame) {
1204  skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1205  if (s->custom_pcf)
1206  skip_bits(&s->gb, 2); //extended Temporal reference
1207  skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1208  }
1209 
1210  if (s->pict_type!=AV_PICTURE_TYPE_B) {
1211  s->time = s->picture_number;
1212  s->pp_time = s->time - s->last_non_b_time;
1213  s->last_non_b_time = s->time;
1214  }else{
1215  s->time = s->picture_number;
1216  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1217  if (s->pp_time <=s->pb_time ||
1218  s->pp_time <= s->pp_time - s->pb_time ||
1219  s->pp_time <= 0){
1220  s->pp_time = 2;
1221  s->pb_time = 1;
1222  }
1224  }
1225 
1226  /* PEI */
1227  if (skip_1stop_8data_bits(&s->gb) < 0)
1228  return AVERROR_INVALIDDATA;
1229 
1230  if(s->h263_slice_structured){
1231  if (check_marker(s->avctx, &s->gb, "SEPB1") != 1) {
1232  return -1;
1233  }
1234 
1235  ff_h263_decode_mba(s);
1236 
1237  if (check_marker(s->avctx, &s->gb, "SEPB2") != 1) {
1238  return -1;
1239  }
1240  }
1241  s->f_code = 1;
1242 
1243  if (s->pict_type == AV_PICTURE_TYPE_B)
1244  s->low_delay = 0;
1245 
1246  if(s->h263_aic){
1247  s->y_dc_scale_table=
1249  }else{
1250  s->y_dc_scale_table=
1252  }
1253 
1255  if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
1256  int i,j;
1257  for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1258  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1259  for(i=0; i<13; i++){
1260  for(j=0; j<3; j++){
1261  int v= get_bits(&s->gb, 8);
1262  v |= get_sbits(&s->gb, 8)<<8;
1263  av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1264  }
1265  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1266  }
1267  for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1268  }
1269 
1270  return 0;
1271 }
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
#define SLICE_ERROR
Definition: mpegvideo.h:502
AVRational framerate
Definition: avcodec.h:3390
#define MB_TYPE_SKIP
Definition: avcodec.h:1272
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
static void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
Definition: ituh263dec.c:613
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
#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:75
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:167
#define tab_bias
Definition: ituh263dec.c:612
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:407
RLTable ff_rl_intra_aic
Definition: h263data.c:230
int num
Numerator.
Definition: rational.h:59
#define MB_TYPE_INTRA4x4
Definition: avcodec.h:1261
enum AVCodecID codec_id
Definition: mpegvideo.h:109
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2994
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:2101
#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:1280
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2988
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:1895
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:206
#define SLICE_OK
Definition: mpegvideo.h:501
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:246
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:307
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:2932
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:3102
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:587
#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
int16_t direct_scale_mv[2][64]
precomputed to avoid divisions in ff_mpeg4_set_direct_mv
Definition: mpegvideo.h:280
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.
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:404
static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
Definition: ituh263dec.c:593
GetBitContext gb
Definition: mpegvideo.h:446
#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:509
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:280
const uint8_t ff_h263_inter_MCBPC_bits[28]
Definition: h263data.c:49
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:264
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:2979
#define MB_TYPE_DIRECT2
Definition: avcodec.h:1269
#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
Picture.
Definition: mpegpicture.h:45
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:296
#define MB_TYPE_L0L1
Definition: avcodec.h:1279
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:554
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:1270
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define MB_TYPE_L1
Definition: avcodec.h:1278
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:2931
const uint8_t ff_h263_intra_MCBPC_code[9]
Definition: h263data.c:34
static int set_direct_mv(MpegEncContext *s)
Definition: ituh263dec.c:641
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:503
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:313
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:338
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:306
Rational number (pair of numerator and denominator).
Definition: rational.h:58
struct AVFrame * f
Definition: mpegpicture.h:46
#define CBPC_B_VLC_BITS
Definition: ituh263dec.c:56
#define MB_TYPE_16x16
Definition: avcodec.h:1264
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
const uint8_t ff_h263_cbpy_tab[16][2]
Definition: h263data.c:84
#define tab_size
Definition: ituh263dec.c:611
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:977
#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:140
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:1281
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:220
#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
static double c[64]
#define MB_TYPE_8x8
Definition: avcodec.h:1267
Picture last_picture
copy of the previous picture structure.
Definition: mpegvideo.h:159
Bi-dir predicted.
Definition: avutil.h:276
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:1732
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
#define IS_8X8(a)
Definition: mpegutils.h:91
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:498
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:165
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:464
int chroma_qscale
chroma QP
Definition: mpegvideo.h:202
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2483
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:125
int rv10_version
RV10 version: 0 or 3.
Definition: mpegvideo.h:418
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:592
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:678
#define MB_TYPE_L0
Definition: avcodec.h:1277
Predicted.
Definition: avutil.h:275
#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