FFmpeg  4.3.9
msmpeg4dec.c
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1 /*
2  * MSMPEG4 backend for encoder and decoder
3  * Copyright (c) 2001 Fabrice Bellard
4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * msmpeg4v1 & v2 stuff by 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 #include "avcodec.h"
26 #include "internal.h"
27 #include "mpegutils.h"
28 #include "mpegvideo.h"
29 #include "msmpeg4.h"
30 #include "libavutil/imgutils.h"
31 #include "h263.h"
32 #include "mpeg4video.h"
33 #include "msmpeg4data.h"
34 #include "vc1data.h"
35 #include "wmv2.h"
36 
37 #define DC_VLC_BITS 9
38 #define V2_INTRA_CBPC_VLC_BITS 3
39 #define V2_MB_TYPE_VLC_BITS 7
40 #define MV_VLC_BITS 9
41 #define V2_MV_VLC_BITS 9
42 #define TEX_VLC_BITS 9
43 
44 #define DEFAULT_INTER_INDEX 3
45 
46 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
47  int32_t **dc_val_ptr)
48 {
49  int i;
50 
51  if (n < 4) {
52  i= 0;
53  } else {
54  i= n-3;
55  }
56 
57  *dc_val_ptr= &s->last_dc[i];
58  return s->last_dc[i];
59 }
60 
61 /****************************************/
62 /* decoding stuff */
63 
69 static VLC v2_mv_vlc;
71 
72 /* This is identical to H.263 except that its range is multiplied by 2. */
73 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
74 {
75  int code, val, sign, shift;
76 
77  code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2);
78  ff_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
79  if (code < 0)
80  return 0xffff;
81 
82  if (code == 0)
83  return pred;
84  sign = get_bits1(&s->gb);
85  shift = f_code - 1;
86  val = code;
87  if (shift) {
88  val = (val - 1) << shift;
89  val |= get_bits(&s->gb, shift);
90  val++;
91  }
92  if (sign)
93  val = -val;
94 
95  val += pred;
96  if (val <= -64)
97  val += 64;
98  else if (val >= 64)
99  val -= 64;
100 
101  return val;
102 }
103 
104 static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
105 {
106  int cbp, code, i;
107  uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
108 
109  if (s->pict_type == AV_PICTURE_TYPE_P) {
110  if (s->use_skip_mb_code) {
111  if (get_bits1(&s->gb)) {
112  /* skip mb */
113  s->mb_intra = 0;
114  for(i=0;i<6;i++)
115  s->block_last_index[i] = -1;
116  s->mv_dir = MV_DIR_FORWARD;
117  s->mv_type = MV_TYPE_16X16;
118  s->mv[0][0][0] = 0;
119  s->mv[0][0][1] = 0;
120  s->mb_skipped = 1;
121  *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
122  return 0;
123  }
124  }
125 
126  if(s->msmpeg4_version==2)
127  code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);
128  else
130  if(code<0 || code>7){
131  av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
132  return -1;
133  }
134 
135  s->mb_intra = code >>2;
136 
137  cbp = code & 0x3;
138  } else {
139  s->mb_intra = 1;
140  if(s->msmpeg4_version==2)
141  cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);
142  else
144  if(cbp<0 || cbp>3){
145  av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
146  return -1;
147  }
148  }
149 
150  if (!s->mb_intra) {
151  int mx, my, cbpy;
152 
154  if(cbpy<0){
155  av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
156  return -1;
157  }
158 
159  cbp|= cbpy<<2;
160  if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
161 
162  ff_h263_pred_motion(s, 0, 0, &mx, &my);
163  mx= msmpeg4v2_decode_motion(s, mx, 1);
164  my= msmpeg4v2_decode_motion(s, my, 1);
165 
166  s->mv_dir = MV_DIR_FORWARD;
167  s->mv_type = MV_TYPE_16X16;
168  s->mv[0][0][0] = mx;
169  s->mv[0][0][1] = my;
170  *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
171  } else {
172  int v;
173  if(s->msmpeg4_version==2){
174  s->ac_pred = get_bits1(&s->gb);
176  if (v < 0) {
177  av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
178  return -1;
179  }
180  cbp|= v<<2;
181  } else{
182  s->ac_pred = 0;
184  if (v < 0) {
185  av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
186  return -1;
187  }
188  cbp|= v<<2;
189  if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
190  }
191  *mb_type_ptr = MB_TYPE_INTRA;
192  }
193 
194  s->bdsp.clear_blocks(s->block[0]);
195  for (i = 0; i < 6; i++) {
196  if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
197  {
198  av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
199  return -1;
200  }
201  }
202  return 0;
203 }
204 
205 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
206 {
207  int cbp, code, i;
208  uint8_t *coded_val;
209  uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
210 
211  if (get_bits_left(&s->gb) <= 0)
212  return AVERROR_INVALIDDATA;
213 
214  if (s->pict_type == AV_PICTURE_TYPE_P) {
215  if (s->use_skip_mb_code) {
216  if (get_bits1(&s->gb)) {
217  /* skip mb */
218  s->mb_intra = 0;
219  for(i=0;i<6;i++)
220  s->block_last_index[i] = -1;
221  s->mv_dir = MV_DIR_FORWARD;
222  s->mv_type = MV_TYPE_16X16;
223  s->mv[0][0][0] = 0;
224  s->mv[0][0][1] = 0;
225  s->mb_skipped = 1;
226  *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
227 
228  return 0;
229  }
230  }
231 
232  code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
233  if (code < 0)
234  return -1;
235  //s->mb_intra = (code & 0x40) ? 0 : 1;
236  s->mb_intra = (~code & 0x40) >> 6;
237 
238  cbp = code & 0x3f;
239  } else {
240  s->mb_intra = 1;
242  if (code < 0)
243  return -1;
244  /* predict coded block pattern */
245  cbp = 0;
246  for(i=0;i<6;i++) {
247  int val = ((code >> (5 - i)) & 1);
248  if (i < 4) {
249  int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
250  val = val ^ pred;
251  *coded_val = val;
252  }
253  cbp |= val << (5 - i);
254  }
255  }
256 
257  if (!s->mb_intra) {
258  int mx, my;
259  if(s->per_mb_rl_table && cbp){
260  s->rl_table_index = decode012(&s->gb);
262  }
263  ff_h263_pred_motion(s, 0, 0, &mx, &my);
264  if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
265  return -1;
266  s->mv_dir = MV_DIR_FORWARD;
267  s->mv_type = MV_TYPE_16X16;
268  s->mv[0][0][0] = mx;
269  s->mv[0][0][1] = my;
270  *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
271  } else {
272  ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
273  ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
274  show_bits(&s->gb, 24));
275  s->ac_pred = get_bits1(&s->gb);
276  *mb_type_ptr = MB_TYPE_INTRA;
277  if(s->inter_intra_pred){
278  s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
279  ff_dlog(s, "%d%d %d %d/",
280  s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
281  }
282  if(s->per_mb_rl_table && cbp){
283  s->rl_table_index = decode012(&s->gb);
285  }
286  }
287 
288  s->bdsp.clear_blocks(s->block[0]);
289  for (i = 0; i < 6; i++) {
290  if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
291  {
292  av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
293  return -1;
294  }
295  }
296 
297  return 0;
298 }
299 
300 /* init all vlc decoding tables */
302 {
303  MpegEncContext *s = avctx->priv_data;
304  static volatile int done = 0;
305  int i, ret;
306  MVTable *mv;
307 
308  if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
309  return ret;
310 
311  if (ff_h263_decode_init(avctx) < 0)
312  return -1;
313 
315 
316  if (!done) {
317  for(i=0;i<NB_RL_TABLES;i++) {
319  }
320  INIT_VLC_RL(ff_rl_table[0], 642);
321  INIT_VLC_RL(ff_rl_table[1], 1104);
322  INIT_VLC_RL(ff_rl_table[2], 554);
323  INIT_VLC_RL(ff_rl_table[3], 940);
324  INIT_VLC_RL(ff_rl_table[4], 962);
325  INIT_VLC_RL(ff_rl_table[5], 554);
326 
327  mv = &ff_mv_tables[0];
328  INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
329  mv->table_mv_bits, 1, 1,
330  mv->table_mv_code, 2, 2, 3714);
331  mv = &ff_mv_tables[1];
332  INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
333  mv->table_mv_bits, 1, 1,
334  mv->table_mv_code, 2, 2, 2694);
335 
337  &ff_table0_dc_lum[0][1], 8, 4,
338  &ff_table0_dc_lum[0][0], 8, 4, 1158);
340  &ff_table0_dc_chroma[0][1], 8, 4,
341  &ff_table0_dc_chroma[0][0], 8, 4, 1118);
343  &ff_table1_dc_lum[0][1], 8, 4,
344  &ff_table1_dc_lum[0][0], 8, 4, 1476);
346  &ff_table1_dc_chroma[0][1], 8, 4,
347  &ff_table1_dc_chroma[0][0], 8, 4, 1216);
348 
349  INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
350  &ff_v2_dc_lum_table[0][1], 8, 4,
351  &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
352  INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
353  &ff_v2_dc_chroma_table[0][1], 8, 4,
354  &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
355 
356  INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
357  &ff_v2_intra_cbpc[0][1], 2, 1,
358  &ff_v2_intra_cbpc[0][0], 2, 1, 8);
359  INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
360  &ff_v2_mb_type[0][1], 2, 1,
361  &ff_v2_mb_type[0][0], 2, 1, 128);
362  INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
363  &ff_mvtab[0][1], 2, 1,
364  &ff_mvtab[0][0], 2, 1, 538);
365 
366  INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
367  &ff_wmv2_inter_table[0][0][1], 8, 4,
368  &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
369  INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
370  &ff_wmv2_inter_table[1][0][1], 8, 4,
371  &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
372  INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
373  &ff_wmv2_inter_table[2][0][1], 8, 4,
374  &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
375  INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
376  &ff_wmv2_inter_table[3][0][1], 8, 4,
377  &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
378 
380  &ff_msmp4_mb_i_table[0][1], 4, 2,
381  &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
382 
383  INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
384  &ff_table_inter_intra[0][1], 2, 1,
385  &ff_table_inter_intra[0][0], 2, 1, 8);
386  done = 1;
387  }
388 
389  switch(s->msmpeg4_version){
390  case 1:
391  case 2:
393  break;
394  case 3:
395  case 4:
397  break;
398  case 5:
401  case 6:
402  //FIXME + TODO VC1 decode mb
403  break;
404  }
405 
406  s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
407 
408  return 0;
409 }
410 
412 {
413  int code;
414 
415  // at minimum one bit per macroblock is required at least in a valid frame,
416  // we discard frames much smaller than this. Frames smaller than 1/8 of the
417  // smallest "black/skip" frame generally contain not much recoverable content
418  // while at the same time they have the highest computational requirements
419  // per byte
420  if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
421  return AVERROR_INVALIDDATA;
422 
423  if(s->msmpeg4_version==1){
424  int start_code = get_bits_long(&s->gb, 32);
425  if(start_code!=0x00000100){
426  av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
427  return -1;
428  }
429 
430  skip_bits(&s->gb, 5); // frame number */
431  }
432 
433  s->pict_type = get_bits(&s->gb, 2) + 1;
434  if (s->pict_type != AV_PICTURE_TYPE_I &&
436  av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
437  return -1;
438  }
439  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
440  if(s->qscale==0){
441  av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
442  return -1;
443  }
444 
445  if (s->pict_type == AV_PICTURE_TYPE_I) {
446  code = get_bits(&s->gb, 5);
447  if(s->msmpeg4_version==1){
448  if(code==0 || code>s->mb_height){
449  av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
450  return -1;
451  }
452 
453  s->slice_height = code;
454  }else{
455  /* 0x17: one slice, 0x18: two slices, ... */
456  if (code < 0x17){
457  av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
458  return -1;
459  }
460 
461  s->slice_height = s->mb_height / (code - 0x16);
462  }
463 
464  switch(s->msmpeg4_version){
465  case 1:
466  case 2:
467  s->rl_chroma_table_index = 2;
468  s->rl_table_index = 2;
469 
470  s->dc_table_index = 0; //not used
471  break;
472  case 3:
474  s->rl_table_index = decode012(&s->gb);
475 
476  s->dc_table_index = get_bits1(&s->gb);
477  break;
478  case 4:
479  ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
480 
482  else s->per_mb_rl_table= 0;
483 
484  if(!s->per_mb_rl_table){
486  s->rl_table_index = decode012(&s->gb);
487  }
488 
489  s->dc_table_index = get_bits1(&s->gb);
490  s->inter_intra_pred= 0;
491  break;
492  }
493  s->no_rounding = 1;
495  av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
496  s->qscale,
498  s->rl_table_index,
499  s->dc_table_index,
500  s->per_mb_rl_table,
501  s->slice_height);
502  } else {
503  switch(s->msmpeg4_version){
504  case 1:
505  case 2:
506  if(s->msmpeg4_version==1)
507  s->use_skip_mb_code = 1;
508  else
509  s->use_skip_mb_code = get_bits1(&s->gb);
510  s->rl_table_index = 2;
512  s->dc_table_index = 0; //not used
513  s->mv_table_index = 0;
514  break;
515  case 3:
516  s->use_skip_mb_code = get_bits1(&s->gb);
517  s->rl_table_index = decode012(&s->gb);
519 
520  s->dc_table_index = get_bits1(&s->gb);
521 
522  s->mv_table_index = get_bits1(&s->gb);
523  break;
524  case 4:
525  s->use_skip_mb_code = get_bits1(&s->gb);
526 
528  else s->per_mb_rl_table= 0;
529 
530  if(!s->per_mb_rl_table){
531  s->rl_table_index = decode012(&s->gb);
533  }
534 
535  s->dc_table_index = get_bits1(&s->gb);
536 
537  s->mv_table_index = get_bits1(&s->gb);
538  s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
539  break;
540  }
541 
543  av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
544  s->use_skip_mb_code,
545  s->rl_table_index,
547  s->dc_table_index,
548  s->mv_table_index,
549  s->per_mb_rl_table,
550  s->qscale);
551 
552  if(s->flipflop_rounding){
553  s->no_rounding ^= 1;
554  }else{
555  s->no_rounding = 0;
556  }
557  }
558  ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
559  s->inter_intra_pred, s->width, s->height);
560 
561  s->esc3_level_length= 0;
562  s->esc3_run_length= 0;
563 
564  return 0;
565 }
566 
568 {
569  int left= buf_size*8 - get_bits_count(&s->gb);
570  int length= s->msmpeg4_version>=3 ? 17 : 16;
571  /* the alt_bitstream reader could read over the end so we need to check it */
572  if(left>=length && left<length+8)
573  {
574  skip_bits(&s->gb, 5); /* fps */
575  s->bit_rate= get_bits(&s->gb, 11)*1024;
576  if(s->msmpeg4_version>=3)
577  s->flipflop_rounding= get_bits1(&s->gb);
578  else
579  s->flipflop_rounding= 0;
580  }
581  else if(left<length+8)
582  {
583  s->flipflop_rounding= 0;
584  if(s->msmpeg4_version != 2)
585  av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
586  }
587  else
588  {
589  av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
590  }
591 
592  return 0;
593 }
594 
595 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
596 {
597  int level, pred;
598 
599  if(s->msmpeg4_version<=2){
600  if (n < 4) {
601  level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
602  } else {
603  level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
604  }
605  if (level < 0) {
606  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
607  *dir_ptr = 0;
608  return -1;
609  }
610  level-=256;
611  }else{ //FIXME optimize use unified tables & index
612  if (n < 4) {
614  } else {
616  }
617  if (level < 0){
618  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
619  *dir_ptr = 0;
620  return -1;
621  }
622 
623  if (level == DC_MAX) {
624  level = get_bits(&s->gb, 8);
625  if (get_bits1(&s->gb))
626  level = -level;
627  } else if (level != 0) {
628  if (get_bits1(&s->gb))
629  level = -level;
630  }
631  }
632 
633  if(s->msmpeg4_version==1){
634  int32_t *dc_val;
635  pred = msmpeg4v1_pred_dc(s, n, &dc_val);
636  level += pred;
637 
638  /* update predictor */
639  *dc_val= level;
640  }else{
641  int16_t *dc_val;
642  pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
643  level += pred;
644 
645  /* update predictor */
646  if (n < 4) {
647  *dc_val = level * s->y_dc_scale;
648  } else {
649  *dc_val = level * s->c_dc_scale;
650  }
651  }
652 
653  return level;
654 }
655 
657  int n, int coded, const uint8_t *scan_table)
658 {
659  int level, i, last, run, run_diff;
660  int av_uninit(dc_pred_dir);
661  RLTable *rl;
662  RL_VLC_ELEM *rl_vlc;
663  int qmul, qadd;
664 
665  if (s->mb_intra) {
666  qmul=1;
667  qadd=0;
668 
669  /* DC coef */
670  level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
671 
672  if (level < 0){
673  av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
674  if(s->inter_intra_pred) level=0;
675  }
676  if (n < 4) {
677  rl = &ff_rl_table[s->rl_table_index];
678  if(level > 256*s->y_dc_scale){
679  av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
680  if(!s->inter_intra_pred) return -1;
681  }
682  } else {
683  rl = &ff_rl_table[3 + s->rl_chroma_table_index];
684  if(level > 256*s->c_dc_scale){
685  av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
686  if(!s->inter_intra_pred) return -1;
687  }
688  }
689  block[0] = level;
690 
691  run_diff = s->msmpeg4_version >= 4;
692  i = 0;
693  if (!coded) {
694  goto not_coded;
695  }
696  if (s->ac_pred) {
697  if (dc_pred_dir == 0)
698  scan_table = s->intra_v_scantable.permutated; /* left */
699  else
700  scan_table = s->intra_h_scantable.permutated; /* top */
701  } else {
702  scan_table = s->intra_scantable.permutated;
703  }
704  rl_vlc= rl->rl_vlc[0];
705  } else {
706  qmul = s->qscale << 1;
707  qadd = (s->qscale - 1) | 1;
708  i = -1;
709  rl = &ff_rl_table[3 + s->rl_table_index];
710 
711  if(s->msmpeg4_version==2)
712  run_diff = 0;
713  else
714  run_diff = 1;
715 
716  if (!coded) {
717  s->block_last_index[n] = i;
718  return 0;
719  }
720  if(!scan_table)
721  scan_table = s->inter_scantable.permutated;
722  rl_vlc= rl->rl_vlc[s->qscale];
723  }
724  {
725  OPEN_READER(re, &s->gb);
726  for(;;) {
727  UPDATE_CACHE(re, &s->gb);
728  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
729  if (level==0) {
730  int cache;
731  cache= GET_CACHE(re, &s->gb);
732  /* escape */
733  if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
734  if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
735  /* third escape */
736  if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
737  UPDATE_CACHE(re, &s->gb);
738  if(s->msmpeg4_version<=3){
739  last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
740  run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
741  level= SHOW_SBITS(re, &s->gb, 8);
742  SKIP_COUNTER(re, &s->gb, 1+6+8);
743  }else{
744  int sign;
745  last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
746  if(!s->esc3_level_length){
747  int ll;
748  ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
749  show_bits(&s->gb, 24), s->mb_x, s->mb_y);
750  if(s->qscale<8){
751  ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
752  if(ll==0){
753  ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
754  }
755  }else{
756  ll=2;
757  while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
758  ll++;
759  SKIP_BITS(re, &s->gb, 1);
760  }
761  if(ll<8) SKIP_BITS(re, &s->gb, 1);
762  }
763 
764  s->esc3_level_length= ll;
765  s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
766  UPDATE_CACHE(re, &s->gb);
767  }
768  run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
769  SKIP_BITS(re, &s->gb, s->esc3_run_length);
770 
771  sign= SHOW_UBITS(re, &s->gb, 1);
772  SKIP_BITS(re, &s->gb, 1);
773 
774  level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
775  SKIP_BITS(re, &s->gb, s->esc3_level_length);
776  if(sign) level= -level;
777  }
778 
779  //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
780  if (level>0) level= level * qmul + qadd;
781  else level= level * qmul - qadd;
782  i+= run + 1;
783  if(last) i+=192;
784  } else {
785  /* second escape */
786  SKIP_BITS(re, &s->gb, 2);
787  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
788  i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
789  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
790  LAST_SKIP_BITS(re, &s->gb, 1);
791  }
792  } else {
793  /* first escape */
794  SKIP_BITS(re, &s->gb, 1);
795  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
796  i+= run;
797  level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
798  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
799  LAST_SKIP_BITS(re, &s->gb, 1);
800  }
801  } else {
802  i+= run;
803  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
804  LAST_SKIP_BITS(re, &s->gb, 1);
805  }
806  if (i > 62){
807  i-= 192;
808  if(i&(~63)){
809  const int left= get_bits_left(&s->gb);
810  if (((i + 192 == 64 && level / qmul == -1) ||
812  left >= 0) {
813  av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
814  i = 63;
815  break;
816  }else{
817  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
818  return -1;
819  }
820  }
821 
822  block[scan_table[i]] = level;
823  break;
824  }
825 
826  block[scan_table[i]] = level;
827  }
828  CLOSE_READER(re, &s->gb);
829  }
830  not_coded:
831  if (s->mb_intra) {
832  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
833  if (s->ac_pred) {
834  i = 63; /* XXX: not optimal */
835  }
836  }
837  if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
838  s->block_last_index[n] = i;
839 
840  return 0;
841 }
842 
844  int *mx_ptr, int *my_ptr)
845 {
846  MVTable *mv;
847  int code, mx, my;
848 
849  mv = &ff_mv_tables[s->mv_table_index];
850 
851  code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
852  if (code < 0){
853  av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
854  return -1;
855  }
856  if (code == mv->n) {
857  mx = get_bits(&s->gb, 6);
858  my = get_bits(&s->gb, 6);
859  } else {
860  mx = mv->table_mvx[code];
861  my = mv->table_mvy[code];
862  }
863 
864  mx += *mx_ptr - 32;
865  my += *my_ptr - 32;
866  /* WARNING : they do not do exactly modulo encoding */
867  if (mx <= -64)
868  mx += 64;
869  else if (mx >= 64)
870  mx -= 64;
871 
872  if (my <= -64)
873  my += 64;
874  else if (my >= 64)
875  my -= 64;
876  *mx_ptr = mx;
877  *my_ptr = my;
878  return 0;
879 }
880 
882  .name = "msmpeg4v1",
883  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
884  .type = AVMEDIA_TYPE_VIDEO,
885  .id = AV_CODEC_ID_MSMPEG4V1,
886  .priv_data_size = sizeof(MpegEncContext),
888  .close = ff_h263_decode_end,
891  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
892  .max_lowres = 3,
893  .pix_fmts = (const enum AVPixelFormat[]) {
896  },
897 };
898 
900  .name = "msmpeg4v2",
901  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
902  .type = AVMEDIA_TYPE_VIDEO,
903  .id = AV_CODEC_ID_MSMPEG4V2,
904  .priv_data_size = sizeof(MpegEncContext),
906  .close = ff_h263_decode_end,
909  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
910  .max_lowres = 3,
911  .pix_fmts = (const enum AVPixelFormat[]) {
914  },
915 };
916 
918  .name = "msmpeg4",
919  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
920  .type = AVMEDIA_TYPE_VIDEO,
921  .id = AV_CODEC_ID_MSMPEG4V3,
922  .priv_data_size = sizeof(MpegEncContext),
924  .close = ff_h263_decode_end,
927  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
928  .max_lowres = 3,
929  .pix_fmts = (const enum AVPixelFormat[]) {
932  },
933 };
934 
936  .name = "wmv1",
937  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
938  .type = AVMEDIA_TYPE_VIDEO,
939  .id = AV_CODEC_ID_WMV1,
940  .priv_data_size = sizeof(MpegEncContext),
942  .close = ff_h263_decode_end,
945  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
946  .max_lowres = 3,
947  .pix_fmts = (const enum AVPixelFormat[]) {
950  },
951 };
static VLC v2_mv_vlc
Definition: msmpeg4dec.c:69
#define DEFAULT_INTER_INDEX
Definition: msmpeg4dec.c:44
int inter_intra_pred
Definition: mpegvideo.h:444
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ScanTable intra_v_scantable
Definition: mpegvideo.h:93
#define V2_MV_VLC_BITS
Definition: msmpeg4dec.c:41
static int shift(int a, int b)
Definition: sonic.c:82
static int msmpeg4v2_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: msmpeg4dec.c:73
int esc3_level_length
Definition: mpegvideo.h:440
VLC ff_mb_non_intra_vlc[4]
Definition: msmpeg4dec.c:64
VLC ff_inter_intra_vlc
Definition: msmpeg4dec.c:70
#define CBPY_VLC_BITS
Definition: h263.h:39
uint32_t ff_v2_dc_lum_table[512][2]
Definition: msmpeg4data.c:34
float re
Definition: fft.c:82
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
const uint32_t ff_table0_dc_lum[120][2]
Definition: msmpeg4data.c:100
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:75
static VLC v2_dc_lum_vlc
Definition: msmpeg4dec.c:65
uint32_t ff_v2_dc_chroma_table[512][2]
Definition: msmpeg4data.c:35
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:185
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:438
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:1674
#define MB_TYPE_INTRA
Definition: mpegutils.h:73
static VLC v2_dc_chroma_vlc
Definition: msmpeg4dec.c:66
#define TEX_VLC_BITS
Definition: msmpeg4dec.c:42
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:1668
mpegvideo header.
#define NB_RL_TABLES
Definition: msmpeg4data.h:60
uint8_t permutated[64]
Definition: idctdsp.h:33
uint8_t run
Definition: svq3.c:209
AVCodec.
Definition: codec.h:190
#define MB_NON_INTRA_VLC_BITS
Definition: msmpeg4.h:34
RLTable.
Definition: rl.h:39
int qscale
QP.
Definition: mpegvideo.h:204
av_cold void ff_msmpeg4_common_init(MpegEncContext *s)
Definition: msmpeg4.c:109
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:307
static int16_t block[64]
Definition: dct.c:115
int esc3_run_length
Definition: mpegvideo.h:441
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
VC-1 tables.
const uint8_t ff_v2_intra_cbpc[4][2]
Definition: msmpeg4data.c:1791
uint8_t
#define av_cold
Definition: attributes.h:88
int ff_msmpeg4_decode_block(MpegEncContext *s, int16_t *block, int n, int coded, const uint8_t *scan_table)
Definition: msmpeg4dec.c:656
uint8_t ff_static_rl_table_store[NB_RL_TABLES][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: msmpeg4data.c:36
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1616
#define MBAC_BITRATE
Definition: msmpeg4.h:38
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:284
#define MB_TYPE_16x16
Definition: mpegutils.h:54
static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: msmpeg4dec.c:104
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:180
MSMPEG4 data tables.
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
#define ff_dlog(a,...)
const uint32_t ff_table0_dc_chroma[120][2]
Definition: msmpeg4data.c:133
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:129
static int msmpeg4v1_pred_dc(MpegEncContext *s, int n, int32_t **dc_val_ptr)
Definition: msmpeg4dec.c:46
int flipflop_rounding
Definition: mpegvideo.h:437
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
const uint16_t ff_msmp4_mb_i_table[64][2]
Definition: msmpeg4data.c:43
#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:185
static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: msmpeg4dec.c:205
int rl_chroma_table_index
Definition: mpegvideo.h:432
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:411
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:195
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:69
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:37
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
const uint8_t * code
Definition: spdifenc.c:413
#define DC_VLC_BITS
Definition: msmpeg4dec.c:37
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int per_mb_rl_table
Definition: mpegvideo.h:439
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:38
int(* decode_mb)(struct MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.h:510
const char * name
Name of the codec implementation.
Definition: codec.h:197
GetBitContext gb
Definition: mpegvideo.h:448
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
#define V2_INTRA_CBPC_VLC_BITS
Definition: msmpeg4dec.c:38
Definition: vlc.h:26
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:193
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:68
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:282
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:99
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:421
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: codec.h:44
const uint8_t ff_v2_mb_type[8][2]
Definition: msmpeg4data.c:1786
int ff_msmpeg4_pred_dc(MpegEncContext *s, int n, int16_t **dc_val_ptr, int *dir_ptr)
Definition: msmpeg4.c:193
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1659
const uint8_t * table_mvx
Definition: msmpeg4data.h:43
int width
picture width / height.
Definition: avcodec.h:699
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:738
int32_t
const uint8_t * table_mv_bits
Definition: msmpeg4data.h:42
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
static int msmpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Definition: msmpeg4dec.c:595
#define s(width, name)
Definition: cbs_vp9.c:257
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:86
const uint32_t ff_table1_dc_chroma[120][2]
Definition: msmpeg4data.c:201
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:567
static const float pred[4]
Definition: siprdata.h:259
static const int8_t mv[256][2]
Definition: 4xm.c:77
AVCodec ff_msmpeg4v1_decoder
Definition: msmpeg4dec.c:881
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
Libavcodec external API header.
BlockDSPContext bdsp
Definition: mpegvideo.h:226
int debug
debug
Definition: avcodec.h:1615
const uint32_t(*const [WMV2_INTER_CBP_TABLE_COUNT] ff_wmv2_inter_table)[2]
Definition: msmpeg4data.c:1956
AVCodec ff_msmpeg4v2_decoder
Definition: msmpeg4dec.c:899
main external API structure.
Definition: avcodec.h:526
static VLC v2_intra_cbpc_vlc
Definition: msmpeg4dec.c:67
ScanTable intra_scantable
Definition: mpegvideo.h:91
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:100
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
const uint16_t * table_mv_code
Definition: msmpeg4data.h:41
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:39
#define DC_MAX
Definition: msmpeg4.h:40
const uint32_t ff_table1_dc_lum[120][2]
Definition: msmpeg4data.c:168
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
#define V2_MB_TYPE_VLC_BITS
Definition: msmpeg4dec.c:39
ScanTable intra_h_scantable
Definition: mpegvideo.h:92
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
#define GET_CACHE(name, gb)
Definition: get_bits.h:215
#define MB_INTRA_VLC_BITS
Definition: msmpeg4.h:35
int slice_height
in macroblocks
Definition: mpegvideo.h:435
int use_skip_mb_code
Definition: mpegvideo.h:434
AVCodec ff_wmv1_decoder
Definition: msmpeg4dec.c:935
MVTable ff_mv_tables[2]
Definition: msmpeg4data.c:1773
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:180
VLC vlc
Definition: msmpeg4data.h:46
#define MB_TYPE_SKIP
Definition: mpegutils.h:62
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
#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:212
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
#define II_BITRATE
Definition: msmpeg4.h:37
RLTable ff_rl_table[NB_RL_TABLES]
Definition: msmpeg4data.c:601
static VLC v2_mb_type_vlc
Definition: msmpeg4dec.c:68
uint8_t level
Definition: svq3.c:210
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:276
MpegEncContext.
Definition: mpegvideo.h:81
struct AVCodecContext * avctx
Definition: mpegvideo.h:98
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
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:130
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
AVCodec ff_msmpeg4v3_decoder
Definition: msmpeg4dec.c:917
#define MV_VLC_BITS
Definition: msmpeg4dec.c:40
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:155
void * priv_data
Definition: avcodec.h:553
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:508
static int decode012(GetBitContext *gb)
Definition: get_bits.h:831
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int64_t bit_rate
wanted bit rate
Definition: mpegvideo.h:103
int ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr)
Definition: msmpeg4dec.c:843
#define CONFIG_WMV2_DECODER
Definition: config.h:988
int rl_table_index
Definition: mpegvideo.h:431
int chroma_qscale
chroma QP
Definition: mpegvideo.h:205
#define av_uninit(x)
Definition: attributes.h:154
#define INTER_INTRA_VLC_BITS
Definition: msmpeg4.h:33
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
const uint8_t * table_mvy
Definition: msmpeg4data.h:44
VLC ff_msmp4_mb_i_vlc
Definition: msmpeg4data.c:38
ScanTable inter_scantable
if inter == intra then intra should be used to reduce the cache usage
Definition: mpegvideo.h:90
int ff_msmpeg4_coded_block_pred(MpegEncContext *s, int n, uint8_t **coded_block_ptr)
Definition: msmpeg4.c:153
static const uint8_t start_code[]
int mv_table_index
Definition: mpegvideo.h:430
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:376
int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: wmv2dec.c:384
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
static double val(void *priv, double ch)
Definition: aeval.c:76
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
const uint8_t ff_table_inter_intra[4][2]
Definition: msmpeg4data.c:1844
int dc_table_index
Definition: mpegvideo.h:433
#define MB_TYPE_L0
Definition: mpegutils.h:67
VLC ff_msmp4_dc_luma_vlc[2]
Definition: msmpeg4data.c:39
Predicted.
Definition: avutil.h:275
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:37
av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
Definition: msmpeg4dec.c:301
VLC ff_msmp4_dc_chroma_vlc[2]
Definition: msmpeg4data.c:40
const uint8_t ff_mvtab[33][2]
Definition: h263data.c:90