Libav
ituh263dec.c
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1 /*
2  * ITU H263 bitstream decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * H263+ support.
5  * Copyright (c) 2001 Juan J. Sierralta P
6  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7  *
8  * This file is part of Libav.
9  *
10  * Libav is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * Libav is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with Libav; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
30 #include <limits.h>
31 
32 #include "libavutil/attributes.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/mathematics.h"
35 #include "avcodec.h"
36 #include "mpegvideo.h"
37 #include "h263.h"
38 #include "mathops.h"
39 #include "unary.h"
40 #include "flv.h"
41 #include "mpeg4video.h"
42 
43 // The defines below define the number of bits that are read at once for
44 // reading vlc values. Changing these may improve speed and data cache needs
45 // be aware though that decreasing them may need the number of stages that is
46 // passed to get_vlc* to be increased.
47 #define MV_VLC_BITS 9
48 #define H263_MBTYPE_B_VLC_BITS 6
49 #define CBPC_B_VLC_BITS 3
50 
51 static const int h263_mb_type_b_map[15]= {
64  0, //stuffing
67 };
68 
71  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",
73  s->gb.size_in_bits, 1-s->no_rounding,
74  s->obmc ? " AP" : "",
75  s->umvplus ? " UMV" : "",
76  s->h263_long_vectors ? " LONG" : "",
77  s->h263_plus ? " +" : "",
78  s->h263_aic ? " AIC" : "",
79  s->alt_inter_vlc ? " AIV" : "",
80  s->modified_quant ? " MQ" : "",
81  s->loop_filter ? " LOOP" : "",
82  s->h263_slice_structured ? " SS" : "",
84  );
85  }
86 }
87 
88 /***********************************************/
89 /* decoding */
90 
94 static VLC mv_vlc;
96 static VLC cbpc_b_vlc;
97 
98 /* init vlcs */
99 
100 /* XXX: find a better solution to handle static init */
102 {
103  static int done = 0;
104 
105  if (!done) {
106  done = 1;
107 
108  INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
110  ff_h263_intra_MCBPC_code, 1, 1, 72);
111  INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
113  ff_h263_inter_MCBPC_code, 1, 1, 198);
114  INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
115  &ff_h263_cbpy_tab[0][1], 2, 1,
116  &ff_h263_cbpy_tab[0][0], 2, 1, 64);
117  INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
118  &ff_mvtab[0][1], 2, 1,
119  &ff_mvtab[0][0], 2, 1, 538);
124  INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
125  &ff_h263_mbtype_b_tab[0][1], 2, 1,
126  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
127  INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
128  &ff_cbpc_b_tab[0][1], 2, 1,
129  &ff_cbpc_b_tab[0][0], 2, 1, 8);
130  }
131 }
132 
134 {
135  int i, mb_pos;
136 
137  for(i=0; i<6; i++){
138  if(s->mb_num-1 <= ff_mba_max[i]) break;
139  }
140  mb_pos= get_bits(&s->gb, ff_mba_length[i]);
141  s->mb_x= mb_pos % s->mb_width;
142  s->mb_y= mb_pos / s->mb_width;
143 
144  return mb_pos;
145 }
146 
152 {
153  unsigned int val, gob_number;
154  int left;
155 
156  /* Check for GOB Start Code */
157  val = show_bits(&s->gb, 16);
158  if(val)
159  return -1;
160 
161  /* We have a GBSC probably with GSTUFF */
162  skip_bits(&s->gb, 16); /* Drop the zeros */
163  left= get_bits_left(&s->gb);
164  //MN: we must check the bits left or we might end in a infinite loop (or segfault)
165  for(;left>13; left--){
166  if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
167  }
168  if(left<=13)
169  return -1;
170 
171  if(s->h263_slice_structured){
172  if(get_bits1(&s->gb)==0)
173  return -1;
174 
176 
177  if(s->mb_num > 1583)
178  if(get_bits1(&s->gb)==0)
179  return -1;
180 
181  s->qscale = get_bits(&s->gb, 5); /* SQUANT */
182  if(get_bits1(&s->gb)==0)
183  return -1;
184  skip_bits(&s->gb, 2); /* GFID */
185  }else{
186  gob_number = get_bits(&s->gb, 5); /* GN */
187  s->mb_x= 0;
188  s->mb_y= s->gob_index* gob_number;
189  skip_bits(&s->gb, 2); /* GFID */
190  s->qscale = get_bits(&s->gb, 5); /* GQUANT */
191  }
192 
193  if(s->mb_y >= s->mb_height)
194  return -1;
195 
196  if(s->qscale==0)
197  return -1;
198 
199  return 0;
200 }
201 
209 {
210  assert(p < end);
211 
212  end-=2;
213  p++;
214  for(;p<end; p+=2){
215  if(!*p){
216  if (!p[-1] && p[1]) return p - 1;
217  else if(!p[ 1] && p[2]) return p;
218  }
219  }
220  return end+2;
221 }
222 
228  int left, pos, ret;
229 
230  if(s->codec_id==AV_CODEC_ID_MPEG4){
231  skip_bits1(&s->gb);
232  align_get_bits(&s->gb);
233  }
234 
235  if(show_bits(&s->gb, 16)==0){
236  pos= get_bits_count(&s->gb);
239  else
240  ret= h263_decode_gob_header(s);
241  if(ret>=0)
242  return pos;
243  }
244  //OK, it's not where it is supposed to be ...
245  s->gb= s->last_resync_gb;
246  align_get_bits(&s->gb);
247  left= get_bits_left(&s->gb);
248 
249  for(;left>16+1+5+5; left-=8){
250  if(show_bits(&s->gb, 16)==0){
251  GetBitContext bak= s->gb;
252 
253  pos= get_bits_count(&s->gb);
256  else
257  ret= h263_decode_gob_header(s);
258  if(ret>=0)
259  return pos;
260 
261  s->gb= bak;
262  }
263  skip_bits(&s->gb, 8);
264  }
265 
266  return -1;
267 }
268 
269 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
270 {
271  int code, val, sign, shift;
272  code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
273 
274  if (code == 0)
275  return pred;
276  if (code < 0)
277  return 0xffff;
278 
279  sign = get_bits1(&s->gb);
280  shift = f_code - 1;
281  val = code;
282  if (shift) {
283  val = (val - 1) << shift;
284  val |= get_bits(&s->gb, shift);
285  val++;
286  }
287  if (sign)
288  val = -val;
289  val += pred;
290 
291  /* modulo decoding */
292  if (!s->h263_long_vectors) {
293  val = sign_extend(val, 5 + f_code);
294  } else {
295  /* horrible h263 long vector mode */
296  if (pred < -31 && val < -63)
297  val += 64;
298  if (pred > 32 && val > 63)
299  val -= 64;
300 
301  }
302  return val;
303 }
304 
305 
306 /* Decode RVLC of H.263+ UMV */
308 {
309  int code = 0, sign;
310 
311  if (get_bits1(&s->gb)) /* Motion difference = 0 */
312  return pred;
313 
314  code = 2 + get_bits1(&s->gb);
315 
316  while (get_bits1(&s->gb))
317  {
318  code <<= 1;
319  code += get_bits1(&s->gb);
320  }
321  sign = code & 1;
322  code >>= 1;
323 
324  code = (sign) ? (pred - code) : (pred + code);
325  av_dlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
326  return code;
327 
328 }
329 
333 static void preview_obmc(MpegEncContext *s){
334  GetBitContext gb= s->gb;
335 
336  int cbpc, i, pred_x, pred_y, mx, my;
337  int16_t *mot_val;
338  const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
339  const int stride= s->b8_stride*2;
340 
341  for(i=0; i<4; i++)
342  s->block_index[i]+= 2;
343  for(i=4; i<6; i++)
344  s->block_index[i]+= 1;
345  s->mb_x++;
346 
347  assert(s->pict_type == AV_PICTURE_TYPE_P);
348 
349  do{
350  if (get_bits1(&s->gb)) {
351  /* skip mb */
352  mot_val = s->current_picture.motion_val[0][s->block_index[0]];
353  mot_val[0 ]= mot_val[2 ]=
354  mot_val[0+stride]= mot_val[2+stride]= 0;
355  mot_val[1 ]= mot_val[3 ]=
356  mot_val[1+stride]= mot_val[3+stride]= 0;
357 
359  goto end;
360  }
361  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
362  }while(cbpc == 20);
363 
364  if(cbpc & 4){
366  }else{
367  get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
368  if (cbpc & 8) {
369  if(s->modified_quant){
370  if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
371  else skip_bits(&s->gb, 5);
372  }else
373  skip_bits(&s->gb, 2);
374  }
375 
376  if ((cbpc & 16) == 0) {
378  /* 16x16 motion prediction */
379  mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
380  if (s->umvplus)
381  mx = h263p_decode_umotion(s, pred_x);
382  else
383  mx = ff_h263_decode_motion(s, pred_x, 1);
384 
385  if (s->umvplus)
386  my = h263p_decode_umotion(s, pred_y);
387  else
388  my = ff_h263_decode_motion(s, pred_y, 1);
389 
390  mot_val[0 ]= mot_val[2 ]=
391  mot_val[0+stride]= mot_val[2+stride]= mx;
392  mot_val[1 ]= mot_val[3 ]=
393  mot_val[1+stride]= mot_val[3+stride]= my;
394  } else {
396  for(i=0;i<4;i++) {
397  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
398  if (s->umvplus)
399  mx = h263p_decode_umotion(s, pred_x);
400  else
401  mx = ff_h263_decode_motion(s, pred_x, 1);
402 
403  if (s->umvplus)
404  my = h263p_decode_umotion(s, pred_y);
405  else
406  my = ff_h263_decode_motion(s, pred_y, 1);
407  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
408  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
409  mot_val[0] = mx;
410  mot_val[1] = my;
411  }
412  }
413  }
414 end:
415 
416  for(i=0; i<4; i++)
417  s->block_index[i]-= 2;
418  for(i=4; i<6; i++)
419  s->block_index[i]-= 1;
420  s->mb_x--;
421 
422  s->gb= gb;
423 }
424 
426  static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
427 
428  if(s->modified_quant){
429  if(get_bits1(&s->gb))
431  else
432  s->qscale= get_bits(&s->gb, 5);
433  }else
434  s->qscale += quant_tab[get_bits(&s->gb, 2)];
435  ff_set_qscale(s, s->qscale);
436 }
437 
438 static int h263_decode_block(MpegEncContext * s, int16_t * block,
439  int n, int coded)
440 {
441  int code, level, i, j, last, run;
442  RLTable *rl = &ff_h263_rl_inter;
443  const uint8_t *scan_table;
444  GetBitContext gb= s->gb;
445 
446  scan_table = s->intra_scantable.permutated;
447  if (s->h263_aic && s->mb_intra) {
448  rl = &ff_rl_intra_aic;
449  i = 0;
450  if (s->ac_pred) {
451  if (s->h263_aic_dir)
452  scan_table = s->intra_v_scantable.permutated; /* left */
453  else
454  scan_table = s->intra_h_scantable.permutated; /* top */
455  }
456  } else if (s->mb_intra) {
457  /* DC coef */
458  if(s->codec_id == AV_CODEC_ID_RV10){
459 #if CONFIG_RV10_DECODER
460  if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
461  int component, diff;
462  component = (n <= 3 ? 0 : n - 4 + 1);
463  level = s->last_dc[component];
464  if (s->rv10_first_dc_coded[component]) {
465  diff = ff_rv_decode_dc(s, n);
466  if (diff == 0xffff)
467  return -1;
468  level += diff;
469  level = level & 0xff; /* handle wrap round */
470  s->last_dc[component] = level;
471  } else {
472  s->rv10_first_dc_coded[component] = 1;
473  }
474  } else {
475  level = get_bits(&s->gb, 8);
476  if (level == 255)
477  level = 128;
478  }
479 #endif
480  }else{
481  level = get_bits(&s->gb, 8);
482  if((level&0x7F) == 0){
483  av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
485  return -1;
486  }
487  if (level == 255)
488  level = 128;
489  }
490  block[0] = level;
491  i = 1;
492  } else {
493  i = 0;
494  }
495  if (!coded) {
496  if (s->mb_intra && s->h263_aic)
497  goto not_coded;
498  s->block_last_index[n] = i - 1;
499  return 0;
500  }
501 retry:
502  for(;;) {
503  code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
504  if (code < 0){
505  av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
506  return -1;
507  }
508  if (code == rl->n) {
509  /* escape */
510  if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
511  ff_flv2_decode_ac_esc(&s->gb, &level, &run, &last);
512  } else {
513  last = get_bits1(&s->gb);
514  run = get_bits(&s->gb, 6);
515  level = (int8_t)get_bits(&s->gb, 8);
516  if(level == -128){
517  if (s->codec_id == AV_CODEC_ID_RV10) {
518  /* XXX: should patch encoder too */
519  level = get_sbits(&s->gb, 12);
520  }else{
521  level = get_bits(&s->gb, 5);
522  level |= get_sbits(&s->gb, 6)<<5;
523  }
524  }
525  }
526  } else {
527  run = rl->table_run[code];
528  level = rl->table_level[code];
529  last = code >= rl->last;
530  if (get_bits1(&s->gb))
531  level = -level;
532  }
533  i += run;
534  if (i >= 64){
535  if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
536  //Looks like a hack but no, it's the way it is supposed to work ...
537  rl = &ff_rl_intra_aic;
538  i = 0;
539  s->gb= gb;
540  s->dsp.clear_block(block);
541  goto retry;
542  }
543  av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
544  return -1;
545  }
546  j = scan_table[i];
547  block[j] = level;
548  if (last)
549  break;
550  i++;
551  }
552 not_coded:
553  if (s->mb_intra && s->h263_aic) {
554  ff_h263_pred_acdc(s, block, n);
555  i = 63;
556  }
557  s->block_last_index[n] = i;
558  return 0;
559 }
560 
561 static int h263_skip_b_part(MpegEncContext *s, int cbp)
562 {
563  LOCAL_ALIGNED_16(int16_t, dblock, [64]);
564  int i, mbi;
565 
566  /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
567  * but real value should be restored in order to be used later (in OBMC condition)
568  */
569  mbi = s->mb_intra;
570  s->mb_intra = 0;
571  for (i = 0; i < 6; i++) {
572  if (h263_decode_block(s, dblock, i, cbp&32) < 0)
573  return -1;
574  cbp+=cbp;
575  }
576  s->mb_intra = mbi;
577  return 0;
578 }
579 
580 static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
581 {
582  int c, mv = 1;
583 
584  if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
585  c = get_bits1(gb);
586  if (pb_frame == 2 && c)
587  mv = !get_bits1(gb);
588  } else { // h.263 Annex M improved PB-frame
589  mv = get_unary(gb, 0, 4) + 1;
590  c = mv & 1;
591  mv = !!(mv & 2);
592  }
593  if(c)
594  *cbpb = get_bits(gb, 6);
595  return mv;
596 }
597 
599  int16_t block[6][64])
600 {
601  int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
602  int16_t *mot_val;
603  const int xy= s->mb_x + s->mb_y * s->mb_stride;
604  int cbpb = 0, pb_mv_count = 0;
605 
606  assert(!s->h263_pred);
607 
608  if (s->pict_type == AV_PICTURE_TYPE_P) {
609  do{
610  if (get_bits1(&s->gb)) {
611  /* skip mb */
612  s->mb_intra = 0;
613  for(i=0;i<6;i++)
614  s->block_last_index[i] = -1;
615  s->mv_dir = MV_DIR_FORWARD;
616  s->mv_type = MV_TYPE_16X16;
618  s->mv[0][0][0] = 0;
619  s->mv[0][0][1] = 0;
620  s->mb_skipped = !(s->obmc | s->loop_filter);
621  goto end;
622  }
623  cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
624  if (cbpc < 0){
625  av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
626  return -1;
627  }
628  }while(cbpc == 20);
629 
630  s->dsp.clear_blocks(s->block[0]);
631 
632  dquant = cbpc & 8;
633  s->mb_intra = ((cbpc & 4) != 0);
634  if (s->mb_intra) goto intra;
635 
636  if(s->pb_frame && get_bits1(&s->gb))
637  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
638  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
639 
640  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
641  cbpy ^= 0xF;
642 
643  cbp = (cbpc & 3) | (cbpy << 2);
644  if (dquant) {
646  }
647 
648  s->mv_dir = MV_DIR_FORWARD;
649  if ((cbpc & 16) == 0) {
651  /* 16x16 motion prediction */
652  s->mv_type = MV_TYPE_16X16;
653  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
654  if (s->umvplus)
655  mx = h263p_decode_umotion(s, pred_x);
656  else
657  mx = ff_h263_decode_motion(s, pred_x, 1);
658 
659  if (mx >= 0xffff)
660  return -1;
661 
662  if (s->umvplus)
663  my = h263p_decode_umotion(s, pred_y);
664  else
665  my = ff_h263_decode_motion(s, pred_y, 1);
666 
667  if (my >= 0xffff)
668  return -1;
669  s->mv[0][0][0] = mx;
670  s->mv[0][0][1] = my;
671 
672  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
673  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
674  } else {
676  s->mv_type = MV_TYPE_8X8;
677  for(i=0;i<4;i++) {
678  mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
679  if (s->umvplus)
680  mx = h263p_decode_umotion(s, pred_x);
681  else
682  mx = ff_h263_decode_motion(s, pred_x, 1);
683  if (mx >= 0xffff)
684  return -1;
685 
686  if (s->umvplus)
687  my = h263p_decode_umotion(s, pred_y);
688  else
689  my = ff_h263_decode_motion(s, pred_y, 1);
690  if (my >= 0xffff)
691  return -1;
692  s->mv[0][i][0] = mx;
693  s->mv[0][i][1] = my;
694  if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
695  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
696  mot_val[0] = mx;
697  mot_val[1] = my;
698  }
699  }
700  } else if(s->pict_type==AV_PICTURE_TYPE_B) {
701  int mb_type;
702  const int stride= s->b8_stride;
703  int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
704  int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
705 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
706 
707  //FIXME ugly
708  mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
709  mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
710  mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
711  mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
712 
713  do{
714  mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
715  if (mb_type < 0){
716  av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
717  return -1;
718  }
719 
720  mb_type= h263_mb_type_b_map[ mb_type ];
721  }while(!mb_type);
722 
723  s->mb_intra = IS_INTRA(mb_type);
724  if(HAS_CBP(mb_type)){
725  s->dsp.clear_blocks(s->block[0]);
726  cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
727  if(s->mb_intra){
728  dquant = IS_QUANT(mb_type);
729  goto intra;
730  }
731 
732  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
733 
734  if (cbpy < 0){
735  av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
736  return -1;
737  }
738 
739  if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
740  cbpy ^= 0xF;
741 
742  cbp = (cbpc & 3) | (cbpy << 2);
743  }else
744  cbp=0;
745 
746  assert(!s->mb_intra);
747 
748  if(IS_QUANT(mb_type)){
750  }
751 
752  if(IS_DIRECT(mb_type)){
753  if (!s->pp_time)
754  return AVERROR_INVALIDDATA;
756  mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);
757  }else{
758  s->mv_dir = 0;
760 //FIXME UMV
761 
762  if(USES_LIST(mb_type, 0)){
763  int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my);
764  s->mv_dir = MV_DIR_FORWARD;
765 
766  mx = ff_h263_decode_motion(s, mx, 1);
767  my = ff_h263_decode_motion(s, my, 1);
768 
769  s->mv[0][0][0] = mx;
770  s->mv[0][0][1] = my;
771  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
772  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
773  }
774 
775  if(USES_LIST(mb_type, 1)){
776  int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my);
777  s->mv_dir |= MV_DIR_BACKWARD;
778 
779  mx = ff_h263_decode_motion(s, mx, 1);
780  my = ff_h263_decode_motion(s, my, 1);
781 
782  s->mv[1][0][0] = mx;
783  s->mv[1][0][1] = my;
784  mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
785  mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
786  }
787  }
788 
789  s->current_picture.mb_type[xy] = mb_type;
790  } else { /* I-Frame */
791  do{
792  cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
793  if (cbpc < 0){
794  av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
795  return -1;
796  }
797  }while(cbpc == 8);
798 
799  s->dsp.clear_blocks(s->block[0]);
800 
801  dquant = cbpc & 4;
802  s->mb_intra = 1;
803 intra:
805  if (s->h263_aic) {
806  s->ac_pred = get_bits1(&s->gb);
807  if(s->ac_pred){
809 
810  s->h263_aic_dir = get_bits1(&s->gb);
811  }
812  }else
813  s->ac_pred = 0;
814 
815  if(s->pb_frame && get_bits1(&s->gb))
816  pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
817  cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
818  if(cbpy<0){
819  av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
820  return -1;
821  }
822  cbp = (cbpc & 3) | (cbpy << 2);
823  if (dquant) {
825  }
826 
827  pb_mv_count += !!s->pb_frame;
828  }
829 
830  while(pb_mv_count--){
831  ff_h263_decode_motion(s, 0, 1);
832  ff_h263_decode_motion(s, 0, 1);
833  }
834 
835  /* decode each block */
836  for (i = 0; i < 6; i++) {
837  if (h263_decode_block(s, block[i], i, cbp&32) < 0)
838  return -1;
839  cbp+=cbp;
840  }
841 
842  if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
843  return -1;
844  if(s->obmc && !s->mb_intra){
845  if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
846  preview_obmc(s);
847  }
848 end:
849 
850  /* per-MB end of slice check */
851  {
852  int v= show_bits(&s->gb, 16);
853 
854  if (get_bits_left(&s->gb) < 16) {
855  v >>= 16 - get_bits_left(&s->gb);
856  }
857 
858  if(v==0)
859  return SLICE_END;
860  }
861 
862  return SLICE_OK;
863 }
864 
865 /* most is hardcoded. should extend to handle all h263 streams */
867 {
868  int format, width, height, i;
869  uint32_t startcode;
870 
871  align_get_bits(&s->gb);
872 
873  startcode= get_bits(&s->gb, 22-8);
874 
875  for(i= get_bits_left(&s->gb); i>24; i-=8) {
876  startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
877 
878  if(startcode == 0x20)
879  break;
880  }
881 
882  if (startcode != 0x20) {
883  av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
884  return -1;
885  }
886  /* temporal reference */
887  i = get_bits(&s->gb, 8); /* picture timestamp */
888  if( (s->picture_number&~0xFF)+i < s->picture_number)
889  i+= 256;
890  s->picture_number= (s->picture_number&~0xFF) + i;
891 
892  /* PTYPE starts here */
893  if (get_bits1(&s->gb) != 1) {
894  /* marker */
895  av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
896  return -1;
897  }
898  if (get_bits1(&s->gb) != 0) {
899  av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
900  return -1; /* h263 id */
901  }
902  skip_bits1(&s->gb); /* split screen off */
903  skip_bits1(&s->gb); /* camera off */
904  skip_bits1(&s->gb); /* freeze picture release off */
905 
906  format = get_bits(&s->gb, 3);
907  /*
908  0 forbidden
909  1 sub-QCIF
910  10 QCIF
911  7 extended PTYPE (PLUSPTYPE)
912  */
913 
914  if (format != 7 && format != 6) {
915  s->h263_plus = 0;
916  /* H.263v1 */
917  width = ff_h263_format[format][0];
918  height = ff_h263_format[format][1];
919  if (!width)
920  return -1;
921 
923 
924  s->h263_long_vectors = get_bits1(&s->gb);
925 
926  if (get_bits1(&s->gb) != 0) {
927  av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n");
928  return -1; /* SAC: off */
929  }
930  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
931  s->unrestricted_mv = s->h263_long_vectors || s->obmc;
932 
933  s->pb_frame = get_bits1(&s->gb);
934  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
935  skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
936 
937  s->width = width;
938  s->height = height;
939  s->avctx->sample_aspect_ratio= (AVRational){12,11};
940  s->avctx->time_base= (AVRational){1001, 30000};
941  } else {
942  int ufep;
943 
944  /* H.263v2 */
945  s->h263_plus = 1;
946  ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
947 
948  /* ufep other than 0 and 1 are reserved */
949  if (ufep == 1) {
950  /* OPPTYPE */
951  format = get_bits(&s->gb, 3);
952  av_dlog(s->avctx, "ufep=1, format: %d\n", format);
953  s->custom_pcf= get_bits1(&s->gb);
954  s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
955  if (get_bits1(&s->gb) != 0) {
956  av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
957  }
958  s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
959  s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
960  s->loop_filter= get_bits1(&s->gb);
961  s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
962 
964  if (get_bits1(&s->gb) != 0) {
965  av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
966  }
967  if (get_bits1(&s->gb) != 0) {
968  av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
969  }
970  s->alt_inter_vlc= get_bits1(&s->gb);
971  s->modified_quant= get_bits1(&s->gb);
972  if(s->modified_quant)
974 
975  skip_bits(&s->gb, 1); /* Prevent start code emulation */
976 
977  skip_bits(&s->gb, 3); /* Reserved */
978  } else if (ufep != 0) {
979  av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
980  return -1;
981  }
982 
983  /* MPPTYPE */
984  s->pict_type = get_bits(&s->gb, 3);
985  switch(s->pict_type){
986  case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
987  case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
988  case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
989  case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
990  case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
991  default:
992  return -1;
993  }
994  skip_bits(&s->gb, 2);
995  s->no_rounding = get_bits1(&s->gb);
996  skip_bits(&s->gb, 4);
997 
998  /* Get the picture dimensions */
999  if (ufep) {
1000  if (format == 6) {
1001  /* Custom Picture Format (CPFMT) */
1002  s->aspect_ratio_info = get_bits(&s->gb, 4);
1003  av_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1004  /* aspect ratios:
1005  0 - forbidden
1006  1 - 1:1
1007  2 - 12:11 (CIF 4:3)
1008  3 - 10:11 (525-type 4:3)
1009  4 - 16:11 (CIF 16:9)
1010  5 - 40:33 (525-type 16:9)
1011  6-14 - reserved
1012  */
1013  width = (get_bits(&s->gb, 9) + 1) * 4;
1014  skip_bits1(&s->gb);
1015  height = get_bits(&s->gb, 9) * 4;
1016  av_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1018  /* aspected dimensions */
1019  s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1020  s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1021  }else{
1023  }
1024  } else {
1025  width = ff_h263_format[format][0];
1026  height = ff_h263_format[format][1];
1027  s->avctx->sample_aspect_ratio= (AVRational){12,11};
1028  }
1029  if ((width == 0) || (height == 0))
1030  return -1;
1031  s->width = width;
1032  s->height = height;
1033 
1034  if(s->custom_pcf){
1035  int gcd;
1036  s->avctx->time_base.den= 1800000;
1037  s->avctx->time_base.num= 1000 + get_bits1(&s->gb);
1038  s->avctx->time_base.num*= get_bits(&s->gb, 7);
1039  if(s->avctx->time_base.num == 0){
1040  av_log(s, AV_LOG_ERROR, "zero framerate\n");
1041  return -1;
1042  }
1043  gcd= av_gcd(s->avctx->time_base.den, s->avctx->time_base.num);
1044  s->avctx->time_base.den /= gcd;
1045  s->avctx->time_base.num /= gcd;
1046  }else{
1047  s->avctx->time_base= (AVRational){1001, 30000};
1048  }
1049  }
1050 
1051  if(s->custom_pcf){
1052  skip_bits(&s->gb, 2); //extended Temporal reference
1053  }
1054 
1055  if (ufep) {
1056  if (s->umvplus) {
1057  if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1058  skip_bits1(&s->gb);
1059  }
1060  if(s->h263_slice_structured){
1061  if (get_bits1(&s->gb) != 0) {
1062  av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1063  }
1064  if (get_bits1(&s->gb) != 0) {
1065  av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1066  }
1067  }
1068  }
1069 
1070  s->qscale = get_bits(&s->gb, 5);
1071  }
1072 
1073  s->mb_width = (s->width + 15) / 16;
1074  s->mb_height = (s->height + 15) / 16;
1075  s->mb_num = s->mb_width * s->mb_height;
1076 
1077  if (s->pb_frame) {
1078  skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1079  if (s->custom_pcf)
1080  skip_bits(&s->gb, 2); //extended Temporal reference
1081  skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1082  }
1083 
1084  if (s->pict_type!=AV_PICTURE_TYPE_B) {
1085  s->time = s->picture_number;
1086  s->pp_time = s->time - s->last_non_b_time;
1087  s->last_non_b_time = s->time;
1088  }else{
1089  s->time = s->picture_number;
1090  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1091  if (s->pp_time <=s->pb_time ||
1092  s->pp_time <= s->pp_time - s->pb_time ||
1093  s->pp_time <= 0){
1094  s->pp_time = 2;
1095  s->pb_time = 1;
1096  }
1098  }
1099 
1100  /* PEI */
1101  while (get_bits1(&s->gb) != 0) {
1102  skip_bits(&s->gb, 8);
1103  }
1104 
1105  if(s->h263_slice_structured){
1106  if (get_bits1(&s->gb) != 1) {
1107  av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n");
1108  return -1;
1109  }
1110 
1111  ff_h263_decode_mba(s);
1112 
1113  if (get_bits1(&s->gb) != 1) {
1114  av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n");
1115  return -1;
1116  }
1117  }
1118  s->f_code = 1;
1119 
1120  if(s->h263_aic){
1121  s->y_dc_scale_table=
1123  }else{
1124  s->y_dc_scale_table=
1126  }
1127 
1129  if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO")){
1130  int i,j;
1131  for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1132  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1133  for(i=0; i<13; i++){
1134  for(j=0; j<3; j++){
1135  int v= get_bits(&s->gb, 8);
1136  v |= get_sbits(&s->gb, 8)<<8;
1137  av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1138  }
1139  av_log(s->avctx, AV_LOG_DEBUG, "\n");
1140  }
1141  for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1142  }
1143 
1144  return 0;
1145 }
av_cold void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:101
int rv10_first_dc_coded[3]
Definition: mpegvideo.h:607
int last
number of values for last = 0
Definition: rl.h:40
#define MB_TYPE_SKIP
Definition: avcodec.h:813
int aspect_ratio_info
Definition: mpegvideo.h:587
int picture_number
Definition: mpegvideo.h:298
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
ScanTable intra_v_scantable
Definition: mpegvideo.h:321
const uint8_t ff_cbpc_b_tab[4][2]
Definition: h263data.h:78
static int h263_decode_gob_header(MpegEncContext *s)
Decode the group of blocks header or slice header.
Definition: ituh263dec.c:151
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:92
#define CBPY_VLC_BITS
Definition: h263.h:39
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:374
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
RLTable ff_h263_rl_inter
Definition: h263data.h:162
const uint8_t ff_h263_intra_MCBPC_code[9]
Definition: h263data.h:36
const uint8_t ff_h263_cbpy_tab[16][2]
Definition: h263data.h:85
int num
numerator
Definition: rational.h:44
#define MB_TYPE_INTRA4x4
Definition: avcodec.h:802
enum AVCodecID codec_id
Definition: mpegvideo.h:280
int obmc
overlapped block motion compensation
Definition: mpegvideo.h:555
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:1422
static int h263_decode_block(MpegEncContext *s, int16_t *block, int n, int coded)
Definition: ituh263dec.c:438
#define MB_TYPE_QUANT
Definition: avcodec.h:821
#define AV_EF_BITSTREAM
Definition: avcodec.h:2399
mpegvideo header.
#define FF_ASPECT_EXTENDED
Definition: avcodec.h:1230
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
uint8_t permutated[64]
Definition: dsputil.h:113
const int8_t * table_level
Definition: rl.h:43
uint8_t run
Definition: svq3.c:142
const uint16_t ff_h263_format[8][2]
Definition: h263data.h:239
#define SLICE_OK
Definition: mpegvideo.h:680
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:305
int stride
Definition: mace.c:144
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:392
const uint8_t ff_modified_quant_tab[2][32]
Definition: h263data.h:253
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:226
int h263_aic
Advanded INTRA Coding (AIC)
Definition: mpegvideo.h:315
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:312
Macro definitions for various function/variable attributes.
#define USES_LIST(a, list)
does this mb use listX, note does not work if subMBs
Definition: mpegvideo.h:179
#define HAS_CBP(a)
Definition: mpegvideo.h:180
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1173
int modified_quant
Definition: mpegvideo.h:566
uint8_t ff_mba_length[7]
Definition: h263data.h:271
int alt_inter_vlc
alternative inter vlc
Definition: mpegvideo.h:565
int mb_num_left
number of MBs left in this video packet (for partitioned Slices only)
Definition: mpegvideo.h:547
int64_t time
time of current frame
Definition: mpegvideo.h:575
#define MB_TYPE_INTRA
Definition: mpegvideo.h:157
#define MV_DIRECT
bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...
Definition: mpegvideo.h:439
#define CONFIG_FLV_DECODER
Definition: config.h:442
uint8_t
#define av_cold
Definition: attributes.h:66
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:443
const uint8_t ff_h263_intra_MCBPC_bits[9]
Definition: h263data.h:37
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2349
const uint8_t ff_mvtab[33][2]
Definition: h263data.h:91
static VLC h263_mbtype_b_vlc
Definition: ituh263dec.c:95
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:459
const uint8_t ff_h263_inter_MCBPC_bits[28]
Definition: h263data.h:50
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:366
GetBitContext last_resync_gb
used to search for the next resync marker
Definition: mpegvideo.h:546
#define IS_QUANT(a)
Definition: mpegvideo.h:177
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
RLTable ff_rl_intra_aic
Definition: h263data.h:231
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:43
uint16_t pp_time
time distance between the last 2 p,s,i frames
Definition: mpegvideo.h:577
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:300
static int h263_skip_b_part(MpegEncContext *s, int cbp)
Definition: ituh263dec.c:561
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:290
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.h:275
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2463
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:555
#define H263_MBTYPE_B_VLC_BITS
Definition: ituh263dec.c:48
int h263_plus
h263 plus headers
Definition: mpegvideo.h:277
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:371
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:381
int unrestricted_mv
mv can point outside of the coded picture
Definition: mpegvideo.h:408
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:269
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:144
static const int h263_mb_type_b_map[15]
Definition: ituh263dec.c:51
int h263_slice_structured
Definition: mpegvideo.h:564
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:38
int64_t av_gcd(int64_t a, int64_t b)
Return the greatest common divisor of a and b.
Definition: mathematics.c:53
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:80
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:580
GetBitContext gb
Definition: mpegvideo.h:632
VLC vlc
decoding only deprecated FIXME remove
Definition: rl.h:47
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:59
Definition: get_bits.h:64
common internal API header
int n
number of entries of table_vlc minus 1
Definition: rl.h:39
int err_recognition
Definition: mpegvideo.h:549
#define MB_TYPE_DIRECT2
Definition: avcodec.h:810
int umvplus
== H263+ && unrestricted_mv
Definition: mpegvideo.h:562
void(* clear_blocks)(int16_t *blocks)
Definition: dsputil.h:143
int16_t(*[2] motion_val)[2]
Definition: mpegvideo.h:107
int size_in_bits
Definition: get_bits.h:56
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:254
const int8_t * table_run
Definition: rl.h:42
#define MB_TYPE_L0L1
Definition: avcodec.h:820
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:522
#define AV_RL32
Definition: intreadwrite.h:146
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:314
int pb_frame
PB frame mode (0 = none, 1 = base, 2 = improved)
Definition: mpegvideo.h:274
#define MB_TYPE_ACPRED
Definition: avcodec.h:811
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:93
#define MB_TYPE_L1
Definition: avcodec.h:819
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.h:248
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:133
const uint8_t ff_h263_inter_MCBPC_code[28]
Definition: h263data.h:41
static int h263p_decode_umotion(MpegEncContext *s, int pred)
Definition: ituh263dec.c:307
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:485
static const float pred[4]
Definition: siprdata.h:259
static const int8_t mv[256][2]
Definition: 4xm.c:72
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:441
#define MV_VLC_BITS
Definition: ituh263dec.c:47
#define MV_DIR_BACKWARD
Definition: mpegvideo.h:438
static int width
Definition: utils.c:156
int64_t last_non_b_time
Definition: mpegvideo.h:576
Libavcodec external API header.
int h263_flv
use flv h263 header
Definition: mpegvideo.h:278
uint8_t ff_h263_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: h263.c:42
int debug
debug
Definition: avcodec.h:2348
ScanTable intra_scantable
Definition: mpegvideo.h:319
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:268
const uint8_t ff_mpeg1_dc_scale_table[128]
Definition: mpegvideo.c:52
#define SLICE_END
end marker found
Definition: mpegvideo.h:682
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:91
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:296
ScanTable intra_h_scantable
Definition: mpegvideo.h:320
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:263
#define CONFIG_MPEG4_DECODER
Definition: config.h:479
rational number numerator/denominator
Definition: rational.h:43
const uint8_t * ff_h263_find_resync_marker(const uint8_t *restrict p, const uint8_t *restrict end)
Find the next resync_marker.
Definition: ituh263dec.c:208
#define CBPC_B_VLC_BITS
Definition: ituh263dec.c:49
#define MB_TYPE_16x16
Definition: avcodec.h:805
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:411
static VLC mv_vlc
Definition: ituh263dec.c:94
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:227
int f_code
forward MV resolution
Definition: mpegvideo.h:415
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:126
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:866
#define MV_DIR_FORWARD
Definition: mpegvideo.h:437
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:399
const uint8_t ff_h263_mbtype_b_tab[15][2]
Definition: h263data.h:60
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:123
static void h263_decode_dquant(MpegEncContext *s)
Definition: ituh263dec.c:425
int h263_pred
use mpeg4/h263 ac/dc predictions
Definition: mpegvideo.h:273
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:375
uint8_t level
Definition: svq3.c:143
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:451
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:302
int height
Definition: gxfenc.c:72
MpegEncContext.
Definition: mpegvideo.h:264
struct AVCodecContext * avctx
Definition: mpegvideo.h:266
#define MB_TYPE_CBP
Definition: avcodec.h:822
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:301
void ff_h263_pred_acdc(MpegEncContext *s, int16_t *block, int n)
Definition: h263.c:225
#define TEX_VLC_BITS
Definition: dv.h:90
const uint8_t ff_h263_chroma_qscale_table[32]
Definition: h263data.h:262
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:33
#define MB_TYPE_8x8
Definition: avcodec.h:808
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:189
void(* clear_block)(int16_t *block)
Definition: dsputil.h:142
Bi-dir predicted.
Definition: avutil.h:255
int den
denominator
Definition: rational.h:45
const uint8_t * chroma_qscale_table
qscale -> chroma_qscale (h263)
Definition: mpegvideo.h:376
#define IS_INTRA(x, y)
void * priv_data
Definition: avcodec.h:1090
static VLC cbpc_b_vlc
Definition: ituh263dec.c:96
void ff_h263_show_pict_info(MpegEncContext *s)
Print picture info if FF_DEBUG_PICT_INFO is set.
Definition: ituh263dec.c:69
#define IS_DIRECT(a)
Definition: mpegvideo.h:166
av_cold void ff_init_rl(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: mpegvideo.c:1479
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:677
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:416
int chroma_qscale
chroma QP
Definition: mpegvideo.h:393
static void preview_obmc(MpegEncContext *s)
read the next MVs for OBMC.
Definition: ituh263dec.c:333
uint32_t * mb_type
Definition: mpegvideo.h:110
#define LOCAL_ALIGNED_16(t, v,...)
Definition: internal.h:106
int rv10_version
RV10 version: 0 or 3.
Definition: mpegvideo.h:606
int h263_long_vectors
use horrible h263v1 long vector mode
Definition: mpegvideo.h:409
#define MV_TYPE_8X8
4 vectors (h263, mpeg4 4MV)
Definition: mpegvideo.h:442
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:563
#define restrict
Definition: config.h:8
void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last)
Definition: flvdec.c:25
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:598
#define MB_TYPE_L0
Definition: avcodec.h:818
Predicted.
Definition: avutil.h:254
uint16_t ff_mba_max[6]
Definition: h263data.h:267
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:37
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:578
static int16_t block[64]
Definition: dct-test.c:170