FFmpeg  2.8.17
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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 "libavutil/x86/asm.h"
32 #include "h263.h"
33 #include "mpeg4video.h"
34 #include "msmpeg4data.h"
35 #include "vc1data.h"
36 #include "wmv2.h"
37 
38 #define DC_VLC_BITS 9
39 #define V2_INTRA_CBPC_VLC_BITS 3
40 #define V2_MB_TYPE_VLC_BITS 7
41 #define MV_VLC_BITS 9
42 #define V2_MV_VLC_BITS 9
43 #define TEX_VLC_BITS 9
44 
45 #define DEFAULT_INTER_INDEX 3
46 
47 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
48  int32_t **dc_val_ptr)
49 {
50  int i;
51 
52  if (n < 4) {
53  i= 0;
54  } else {
55  i= n-3;
56  }
57 
58  *dc_val_ptr= &s->last_dc[i];
59  return s->last_dc[i];
60 }
61 
62 /****************************************/
63 /* decoding stuff */
64 
70 static VLC v2_mv_vlc;
72 
73 /* This is identical to h263 except that its range is multiplied by 2. */
74 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
75 {
76  int code, val, sign, shift;
77 
78  code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2);
79  ff_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
80  if (code < 0)
81  return 0xffff;
82 
83  if (code == 0)
84  return pred;
85  sign = get_bits1(&s->gb);
86  shift = f_code - 1;
87  val = code;
88  if (shift) {
89  val = (val - 1) << shift;
90  val |= get_bits(&s->gb, shift);
91  val++;
92  }
93  if (sign)
94  val = -val;
95 
96  val += pred;
97  if (val <= -64)
98  val += 64;
99  else if (val >= 64)
100  val -= 64;
101 
102  return val;
103 }
104 
105 static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
106 {
107  int cbp, code, i;
108  uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
109 
110  if (s->pict_type == AV_PICTURE_TYPE_P) {
111  if (s->use_skip_mb_code) {
112  if (get_bits1(&s->gb)) {
113  /* skip mb */
114  s->mb_intra = 0;
115  for(i=0;i<6;i++)
116  s->block_last_index[i] = -1;
117  s->mv_dir = MV_DIR_FORWARD;
118  s->mv_type = MV_TYPE_16X16;
119  s->mv[0][0][0] = 0;
120  s->mv[0][0][1] = 0;
121  s->mb_skipped = 1;
122  *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
123  return 0;
124  }
125  }
126 
127  if(s->msmpeg4_version==2)
128  code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);
129  else
131  if(code<0 || code>7){
132  av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
133  return -1;
134  }
135 
136  s->mb_intra = code >>2;
137 
138  cbp = code & 0x3;
139  } else {
140  s->mb_intra = 1;
141  if(s->msmpeg4_version==2)
142  cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);
143  else
145  if(cbp<0 || cbp>3){
146  av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
147  return -1;
148  }
149  }
150 
151  if (!s->mb_intra) {
152  int mx, my, cbpy;
153 
155  if(cbpy<0){
156  av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
157  return -1;
158  }
159 
160  cbp|= cbpy<<2;
161  if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
162 
163  ff_h263_pred_motion(s, 0, 0, &mx, &my);
164  mx= msmpeg4v2_decode_motion(s, mx, 1);
165  my= msmpeg4v2_decode_motion(s, my, 1);
166 
167  s->mv_dir = MV_DIR_FORWARD;
168  s->mv_type = MV_TYPE_16X16;
169  s->mv[0][0][0] = mx;
170  s->mv[0][0][1] = my;
171  *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
172  } else {
173  int v;
174  if(s->msmpeg4_version==2){
175  s->ac_pred = get_bits1(&s->gb);
177  if (v < 0) {
178  av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
179  return -1;
180  }
181  cbp|= v<<2;
182  } else{
183  s->ac_pred = 0;
185  if (v < 0) {
186  av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
187  return -1;
188  }
189  cbp|= v<<2;
190  if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
191  }
192  *mb_type_ptr = MB_TYPE_INTRA;
193  }
194 
195  s->bdsp.clear_blocks(s->block[0]);
196  for (i = 0; i < 6; i++) {
197  if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
198  {
199  av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
200  return -1;
201  }
202  }
203  return 0;
204 }
205 
206 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
207 {
208  int cbp, code, i;
209  uint8_t *coded_val;
210  uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
211 
212  if (s->pict_type == AV_PICTURE_TYPE_P) {
213  if (s->use_skip_mb_code) {
214  if (get_bits1(&s->gb)) {
215  /* skip mb */
216  s->mb_intra = 0;
217  for(i=0;i<6;i++)
218  s->block_last_index[i] = -1;
219  s->mv_dir = MV_DIR_FORWARD;
220  s->mv_type = MV_TYPE_16X16;
221  s->mv[0][0][0] = 0;
222  s->mv[0][0][1] = 0;
223  s->mb_skipped = 1;
224  *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
225 
226  return 0;
227  }
228  }
229 
230  code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
231  if (code < 0)
232  return -1;
233  //s->mb_intra = (code & 0x40) ? 0 : 1;
234  s->mb_intra = (~code & 0x40) >> 6;
235 
236  cbp = code & 0x3f;
237  } else {
238  s->mb_intra = 1;
240  if (code < 0)
241  return -1;
242  /* predict coded block pattern */
243  cbp = 0;
244  for(i=0;i<6;i++) {
245  int val = ((code >> (5 - i)) & 1);
246  if (i < 4) {
247  int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
248  val = val ^ pred;
249  *coded_val = val;
250  }
251  cbp |= val << (5 - i);
252  }
253  }
254 
255  if (!s->mb_intra) {
256  int mx, my;
257  if(s->per_mb_rl_table && cbp){
258  s->rl_table_index = decode012(&s->gb);
260  }
261  ff_h263_pred_motion(s, 0, 0, &mx, &my);
262  if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
263  return -1;
264  s->mv_dir = MV_DIR_FORWARD;
265  s->mv_type = MV_TYPE_16X16;
266  s->mv[0][0][0] = mx;
267  s->mv[0][0][1] = my;
268  *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
269  } else {
270  ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
271  ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
272  show_bits(&s->gb, 24));
273  s->ac_pred = get_bits1(&s->gb);
274  *mb_type_ptr = MB_TYPE_INTRA;
275  if(s->inter_intra_pred){
276  s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
277  ff_dlog(s, "%d%d %d %d/",
278  s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
279  }
280  if(s->per_mb_rl_table && cbp){
281  s->rl_table_index = decode012(&s->gb);
283  }
284  }
285 
286  s->bdsp.clear_blocks(s->block[0]);
287  for (i = 0; i < 6; i++) {
288  if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
289  {
290  av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
291  return -1;
292  }
293  }
294 
295  return 0;
296 }
297 
298 /* init all vlc decoding tables */
300 {
301  MpegEncContext *s = avctx->priv_data;
302  static volatile int done = 0;
303  int i, ret;
304  MVTable *mv;
305 
306  if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
307  return ret;
308 
309  if (ff_h263_decode_init(avctx) < 0)
310  return -1;
311 
313 
314  if (!done) {
315  for(i=0;i<NB_RL_TABLES;i++) {
317  }
318  INIT_VLC_RL(ff_rl_table[0], 642);
319  INIT_VLC_RL(ff_rl_table[1], 1104);
320  INIT_VLC_RL(ff_rl_table[2], 554);
321  INIT_VLC_RL(ff_rl_table[3], 940);
322  INIT_VLC_RL(ff_rl_table[4], 962);
323  INIT_VLC_RL(ff_rl_table[5], 554);
324 
325  mv = &ff_mv_tables[0];
326  INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
327  mv->table_mv_bits, 1, 1,
328  mv->table_mv_code, 2, 2, 3714);
329  mv = &ff_mv_tables[1];
330  INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
331  mv->table_mv_bits, 1, 1,
332  mv->table_mv_code, 2, 2, 2694);
333 
335  &ff_table0_dc_lum[0][1], 8, 4,
336  &ff_table0_dc_lum[0][0], 8, 4, 1158);
338  &ff_table0_dc_chroma[0][1], 8, 4,
339  &ff_table0_dc_chroma[0][0], 8, 4, 1118);
341  &ff_table1_dc_lum[0][1], 8, 4,
342  &ff_table1_dc_lum[0][0], 8, 4, 1476);
344  &ff_table1_dc_chroma[0][1], 8, 4,
345  &ff_table1_dc_chroma[0][0], 8, 4, 1216);
346 
347  INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
348  &ff_v2_dc_lum_table[0][1], 8, 4,
349  &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
350  INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
351  &ff_v2_dc_chroma_table[0][1], 8, 4,
352  &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
353 
354  INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
355  &ff_v2_intra_cbpc[0][1], 2, 1,
356  &ff_v2_intra_cbpc[0][0], 2, 1, 8);
357  INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
358  &ff_v2_mb_type[0][1], 2, 1,
359  &ff_v2_mb_type[0][0], 2, 1, 128);
360  INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
361  &ff_mvtab[0][1], 2, 1,
362  &ff_mvtab[0][0], 2, 1, 538);
363 
364  INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
365  &ff_wmv2_inter_table[0][0][1], 8, 4,
366  &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
367  INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
368  &ff_wmv2_inter_table[1][0][1], 8, 4,
369  &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
370  INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
371  &ff_wmv2_inter_table[2][0][1], 8, 4,
372  &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
373  INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
374  &ff_wmv2_inter_table[3][0][1], 8, 4,
375  &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
376 
378  &ff_msmp4_mb_i_table[0][1], 4, 2,
379  &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
380 
381  INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
382  &ff_table_inter_intra[0][1], 2, 1,
383  &ff_table_inter_intra[0][0], 2, 1, 8);
384  done = 1;
385  }
386 
387  switch(s->msmpeg4_version){
388  case 1:
389  case 2:
391  break;
392  case 3:
393  case 4:
395  break;
396  case 5:
399  case 6:
400  //FIXME + TODO VC1 decode mb
401  break;
402  }
403 
404  s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
405 
406  return 0;
407 }
408 
410 {
411  int code;
412 
413  // at minimum one bit per macroblock is required at least in a valid frame,
414  // we discard frames much smaller than this. Frames smaller than 1/8 of the
415  // smallest "black/skip" frame generally contain not much recoverable content
416  // while at the same time they have the highest computational requirements
417  // per byte
418  if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
419  return AVERROR_INVALIDDATA;
420 
421  if(s->msmpeg4_version==1){
422  int start_code = get_bits_long(&s->gb, 32);
423  if(start_code!=0x00000100){
424  av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
425  return -1;
426  }
427 
428  skip_bits(&s->gb, 5); // frame number */
429  }
430 
431  s->pict_type = get_bits(&s->gb, 2) + 1;
432  if (s->pict_type != AV_PICTURE_TYPE_I &&
434  av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
435  return -1;
436  }
437 #if 0
438 {
439  static int had_i=0;
440  if(s->pict_type == AV_PICTURE_TYPE_I) had_i=1;
441  if(!had_i) return -1;
442 }
443 #endif
444  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
445  if(s->qscale==0){
446  av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
447  return -1;
448  }
449 
450  if (s->pict_type == AV_PICTURE_TYPE_I) {
451  code = get_bits(&s->gb, 5);
452  if(s->msmpeg4_version==1){
453  if(code==0 || code>s->mb_height){
454  av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
455  return -1;
456  }
457 
458  s->slice_height = code;
459  }else{
460  /* 0x17: one slice, 0x18: two slices, ... */
461  if (code < 0x17){
462  av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
463  return -1;
464  }
465 
466  s->slice_height = s->mb_height / (code - 0x16);
467  }
468 
469  switch(s->msmpeg4_version){
470  case 1:
471  case 2:
472  s->rl_chroma_table_index = 2;
473  s->rl_table_index = 2;
474 
475  s->dc_table_index = 0; //not used
476  break;
477  case 3:
479  s->rl_table_index = decode012(&s->gb);
480 
481  s->dc_table_index = get_bits1(&s->gb);
482  break;
483  case 4:
484  ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
485 
487  else s->per_mb_rl_table= 0;
488 
489  if(!s->per_mb_rl_table){
491  s->rl_table_index = decode012(&s->gb);
492  }
493 
494  s->dc_table_index = get_bits1(&s->gb);
495  s->inter_intra_pred= 0;
496  break;
497  }
498  s->no_rounding = 1;
500  av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
501  s->qscale,
503  s->rl_table_index,
504  s->dc_table_index,
505  s->per_mb_rl_table,
506  s->slice_height);
507  } else {
508  switch(s->msmpeg4_version){
509  case 1:
510  case 2:
511  if(s->msmpeg4_version==1)
512  s->use_skip_mb_code = 1;
513  else
514  s->use_skip_mb_code = get_bits1(&s->gb);
515  s->rl_table_index = 2;
517  s->dc_table_index = 0; //not used
518  s->mv_table_index = 0;
519  break;
520  case 3:
521  s->use_skip_mb_code = get_bits1(&s->gb);
522  s->rl_table_index = decode012(&s->gb);
524 
525  s->dc_table_index = get_bits1(&s->gb);
526 
527  s->mv_table_index = get_bits1(&s->gb);
528  break;
529  case 4:
530  s->use_skip_mb_code = get_bits1(&s->gb);
531 
533  else s->per_mb_rl_table= 0;
534 
535  if(!s->per_mb_rl_table){
536  s->rl_table_index = decode012(&s->gb);
538  }
539 
540  s->dc_table_index = get_bits1(&s->gb);
541 
542  s->mv_table_index = get_bits1(&s->gb);
543  s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
544  break;
545  }
546 
548  av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
549  s->use_skip_mb_code,
550  s->rl_table_index,
552  s->dc_table_index,
553  s->mv_table_index,
554  s->per_mb_rl_table,
555  s->qscale);
556 
557  if(s->flipflop_rounding){
558  s->no_rounding ^= 1;
559  }else{
560  s->no_rounding = 0;
561  }
562  }
563  ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
564  s->inter_intra_pred, s->width, s->height);
565 
566  s->esc3_level_length= 0;
567  s->esc3_run_length= 0;
568 
569  return 0;
570 }
571 
573 {
574  int left= buf_size*8 - get_bits_count(&s->gb);
575  int length= s->msmpeg4_version>=3 ? 17 : 16;
576  /* the alt_bitstream reader could read over the end so we need to check it */
577  if(left>=length && left<length+8)
578  {
579  skip_bits(&s->gb, 5); /* fps */
580  s->bit_rate= get_bits(&s->gb, 11)*1024;
581  if(s->msmpeg4_version>=3)
582  s->flipflop_rounding= get_bits1(&s->gb);
583  else
584  s->flipflop_rounding= 0;
585  }
586  else if(left<length+8)
587  {
588  s->flipflop_rounding= 0;
589  if(s->msmpeg4_version != 2)
590  av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
591  }
592  else
593  {
594  av_log(s->avctx, AV_LOG_ERROR, "I frame too long, ignoring ext header\n");
595  }
596 
597  return 0;
598 }
599 
600 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
601 {
602  int level, pred;
603 
604  if(s->msmpeg4_version<=2){
605  if (n < 4) {
606  level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
607  } else {
608  level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
609  }
610  if (level < 0) {
611  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
612  *dir_ptr = 0;
613  return -1;
614  }
615  level-=256;
616  }else{ //FIXME optimize use unified tables & index
617  if (n < 4) {
619  } else {
621  }
622  if (level < 0){
623  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
624  *dir_ptr = 0;
625  return -1;
626  }
627 
628  if (level == DC_MAX) {
629  level = get_bits(&s->gb, 8);
630  if (get_bits1(&s->gb))
631  level = -level;
632  } else if (level != 0) {
633  if (get_bits1(&s->gb))
634  level = -level;
635  }
636  }
637 
638  if(s->msmpeg4_version==1){
639  int32_t *dc_val;
640  pred = msmpeg4v1_pred_dc(s, n, &dc_val);
641  level += pred;
642 
643  /* update predictor */
644  *dc_val= level;
645  }else{
646  int16_t *dc_val;
647  pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
648  level += pred;
649 
650  /* update predictor */
651  if (n < 4) {
652  *dc_val = level * s->y_dc_scale;
653  } else {
654  *dc_val = level * s->c_dc_scale;
655  }
656  }
657 
658  return level;
659 }
660 
661 //#define ERROR_DETAILS
663  int n, int coded, const uint8_t *scan_table)
664 {
665  int level, i, last, run, run_diff;
666  int av_uninit(dc_pred_dir);
667  RLTable *rl;
668  RL_VLC_ELEM *rl_vlc;
669  int qmul, qadd;
670 
671  if (s->mb_intra) {
672  qmul=1;
673  qadd=0;
674 
675  /* DC coef */
676  level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
677 
678  if (level < 0){
679  av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
680  if(s->inter_intra_pred) level=0;
681  }
682  if (n < 4) {
683  rl = &ff_rl_table[s->rl_table_index];
684  if(level > 256*s->y_dc_scale){
685  av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
686  if(!s->inter_intra_pred) return -1;
687  }
688  } else {
689  rl = &ff_rl_table[3 + s->rl_chroma_table_index];
690  if(level > 256*s->c_dc_scale){
691  av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
692  if(!s->inter_intra_pred) return -1;
693  }
694  }
695  block[0] = level;
696 
697  run_diff = s->msmpeg4_version >= 4;
698  i = 0;
699  if (!coded) {
700  goto not_coded;
701  }
702  if (s->ac_pred) {
703  if (dc_pred_dir == 0)
704  scan_table = s->intra_v_scantable.permutated; /* left */
705  else
706  scan_table = s->intra_h_scantable.permutated; /* top */
707  } else {
708  scan_table = s->intra_scantable.permutated;
709  }
710  rl_vlc= rl->rl_vlc[0];
711  } else {
712  qmul = s->qscale << 1;
713  qadd = (s->qscale - 1) | 1;
714  i = -1;
715  rl = &ff_rl_table[3 + s->rl_table_index];
716 
717  if(s->msmpeg4_version==2)
718  run_diff = 0;
719  else
720  run_diff = 1;
721 
722  if (!coded) {
723  s->block_last_index[n] = i;
724  return 0;
725  }
726  if(!scan_table)
727  scan_table = s->inter_scantable.permutated;
728  rl_vlc= rl->rl_vlc[s->qscale];
729  }
730  {
731  OPEN_READER(re, &s->gb);
732  for(;;) {
733  UPDATE_CACHE(re, &s->gb);
734  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
735  if (level==0) {
736  int cache;
737  cache= GET_CACHE(re, &s->gb);
738  /* escape */
739  if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
740  if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
741  /* third escape */
742  if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
743  UPDATE_CACHE(re, &s->gb);
744  if(s->msmpeg4_version<=3){
745  last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
746  run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
747  level= SHOW_SBITS(re, &s->gb, 8);
748  SKIP_COUNTER(re, &s->gb, 1+6+8);
749  }else{
750  int sign;
751  last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
752  if(!s->esc3_level_length){
753  int ll;
754  ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
755  show_bits(&s->gb, 24), s->mb_x, s->mb_y);
756  if(s->qscale<8){
757  ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
758  if(ll==0){
759  ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
760  }
761  }else{
762  ll=2;
763  while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
764  ll++;
765  SKIP_BITS(re, &s->gb, 1);
766  }
767  if(ll<8) SKIP_BITS(re, &s->gb, 1);
768  }
769 
770  s->esc3_level_length= ll;
771  s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
772  UPDATE_CACHE(re, &s->gb);
773  }
774  run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
775  SKIP_BITS(re, &s->gb, s->esc3_run_length);
776 
777  sign= SHOW_UBITS(re, &s->gb, 1);
778  SKIP_BITS(re, &s->gb, 1);
779 
780  level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
781  SKIP_BITS(re, &s->gb, s->esc3_level_length);
782  if(sign) level= -level;
783  }
784 
785 #if 0 // waste of time / this will detect very few errors
786  {
787  const int abs_level= FFABS(level);
788  const int run1= run - rl->max_run[last][abs_level] - run_diff;
789  if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
790  if(abs_level <= rl->max_level[last][run]){
791  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
792  return DECODING_AC_LOST;
793  }
794  if(abs_level <= rl->max_level[last][run]*2){
795  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
796  return DECODING_AC_LOST;
797  }
798  if(run1>=0 && abs_level <= rl->max_level[last][run1]){
799  av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
800  return DECODING_AC_LOST;
801  }
802  }
803  }
804 #endif
805  //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
806  if (level>0) level= level * qmul + qadd;
807  else level= level * qmul - qadd;
808 #if 0 // waste of time too :(
809  if(level>2048 || level<-2048){
810  av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc\n");
811  return DECODING_AC_LOST;
812  }
813 #endif
814  i+= run + 1;
815  if(last) i+=192;
816 #ifdef ERROR_DETAILS
817  if(run==66)
818  av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC3 level=%d\n", level);
819  else if((i>62 && i<192) || i>192+63)
820  av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC3 i=%d run=%d level=%d\n", i, run, level);
821 #endif
822  } else {
823  /* second escape */
824  SKIP_BITS(re, &s->gb, 2);
825  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
826  i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
827  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
828  LAST_SKIP_BITS(re, &s->gb, 1);
829 #ifdef ERROR_DETAILS
830  if(run==66)
831  av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC2 level=%d\n", level);
832  else if((i>62 && i<192) || i>192+63)
833  av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC2 i=%d run=%d level=%d\n", i, run, level);
834 #endif
835  }
836  } else {
837  /* first escape */
838  SKIP_BITS(re, &s->gb, 1);
839  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
840  i+= run;
841  level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
842  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
843  LAST_SKIP_BITS(re, &s->gb, 1);
844 #ifdef ERROR_DETAILS
845  if(run==66)
846  av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC1 level=%d\n", level);
847  else if((i>62 && i<192) || i>192+63)
848  av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC1 i=%d run=%d level=%d\n", i, run, level);
849 #endif
850  }
851  } else {
852  i+= run;
853  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
854  LAST_SKIP_BITS(re, &s->gb, 1);
855 #ifdef ERROR_DETAILS
856  if(run==66)
857  av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code level=%d\n", level);
858  else if((i>62 && i<192) || i>192+63)
859  av_log(s->avctx, AV_LOG_ERROR, "run overflow i=%d run=%d level=%d\n", i, run, level);
860 #endif
861  }
862  if (i > 62){
863  i-= 192;
864  if(i&(~63)){
865  const int left= get_bits_left(&s->gb);
866  if (((i + 192 == 64 && level / qmul == -1) ||
868  left >= 0) {
869  av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
870  i = 63;
871  break;
872  }else{
873  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
874  return -1;
875  }
876  }
877 
878  block[scan_table[i]] = level;
879  break;
880  }
881 
882  block[scan_table[i]] = level;
883  }
884  CLOSE_READER(re, &s->gb);
885  }
886  not_coded:
887  if (s->mb_intra) {
888  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
889  if (s->ac_pred) {
890  i = 63; /* XXX: not optimal */
891  }
892  }
893  if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
894  s->block_last_index[n] = i;
895 
896  return 0;
897 }
898 
900  int *mx_ptr, int *my_ptr)
901 {
902  MVTable *mv;
903  int code, mx, my;
904 
905  mv = &ff_mv_tables[s->mv_table_index];
906 
907  code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
908  if (code < 0){
909  av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
910  return -1;
911  }
912  if (code == mv->n) {
913  mx = get_bits(&s->gb, 6);
914  my = get_bits(&s->gb, 6);
915  } else {
916  mx = mv->table_mvx[code];
917  my = mv->table_mvy[code];
918  }
919 
920  mx += *mx_ptr - 32;
921  my += *my_ptr - 32;
922  /* WARNING : they do not do exactly modulo encoding */
923  if (mx <= -64)
924  mx += 64;
925  else if (mx >= 64)
926  mx -= 64;
927 
928  if (my <= -64)
929  my += 64;
930  else if (my >= 64)
931  my -= 64;
932  *mx_ptr = mx;
933  *my_ptr = my;
934  return 0;
935 }
936 
938  .name = "msmpeg4v1",
939  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
940  .type = AVMEDIA_TYPE_VIDEO,
941  .id = AV_CODEC_ID_MSMPEG4V1,
942  .priv_data_size = sizeof(MpegEncContext),
944  .close = ff_h263_decode_end,
947  .max_lowres = 3,
948  .pix_fmts = (const enum AVPixelFormat[]) {
951  },
952 };
953 
955  .name = "msmpeg4v2",
956  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
957  .type = AVMEDIA_TYPE_VIDEO,
958  .id = AV_CODEC_ID_MSMPEG4V2,
959  .priv_data_size = sizeof(MpegEncContext),
961  .close = ff_h263_decode_end,
964  .max_lowres = 3,
965  .pix_fmts = (const enum AVPixelFormat[]) {
968  },
969 };
970 
972  .name = "msmpeg4",
973  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
974  .type = AVMEDIA_TYPE_VIDEO,
975  .id = AV_CODEC_ID_MSMPEG4V3,
976  .priv_data_size = sizeof(MpegEncContext),
978  .close = ff_h263_decode_end,
981  .max_lowres = 3,
982  .pix_fmts = (const enum AVPixelFormat[]) {
985  },
986 };
987 
989  .name = "wmv1",
990  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
991  .type = AVMEDIA_TYPE_VIDEO,
992  .id = AV_CODEC_ID_WMV1,
993  .priv_data_size = sizeof(MpegEncContext),
995  .close = ff_h263_decode_end,
998  .max_lowres = 3,
999  .pix_fmts = (const enum AVPixelFormat[]) {
1002  },
1003 };
static VLC v2_mv_vlc
Definition: msmpeg4dec.c:70
#define DEFAULT_INTER_INDEX
Definition: msmpeg4dec.c:45
int inter_intra_pred
Definition: mpegvideo.h:447
#define NULL
Definition: coverity.c:32
#define MB_TYPE_SKIP
Definition: avcodec.h:1152
const char const char void * val
Definition: avisynth_c.h:634
float v
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ScanTable intra_v_scantable
Definition: mpegvideo.h:100
#define V2_MV_VLC_BITS
Definition: msmpeg4dec.c:42
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:74
int esc3_level_length
Definition: mpegvideo.h:443
VLC ff_mb_non_intra_vlc[4]
Definition: msmpeg4dec.c:65
VLC ff_inter_intra_vlc
Definition: msmpeg4dec.c:71
#define CBPY_VLC_BITS
Definition: h263.h:41
#define GET_RL_VLC
Definition: get_bits.h:695
uint32_t ff_v2_dc_lum_table[512][2]
Definition: msmpeg4data.c:34
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
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
static VLC v2_dc_lum_vlc
Definition: msmpeg4dec.c:66
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:181
int msmpeg4_version
0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
Definition: mpegvideo.h:441
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define MB_TYPE_INTRA
Definition: mpegutils.h:69
static VLC v2_dc_chroma_vlc
Definition: msmpeg4dec.c:67
#define TEX_VLC_BITS
Definition: msmpeg4dec.c:43
mpegvideo header.
#define NB_RL_TABLES
Definition: msmpeg4data.h:59
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:149
AVCodec.
Definition: avcodec.h:3482
#define MB_NON_INTRA_VLC_BITS
Definition: msmpeg4.h:34
RLTable.
Definition: rl.h:38
int qscale
QP.
Definition: mpegvideo.h:211
av_cold void ff_msmpeg4_common_init(MpegEncContext *s)
Definition: msmpeg4.c:109
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:310
int esc3_run_length
Definition: mpegvideo.h:444
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:46
VC-1 tables.
const uint8_t ff_v2_intra_cbpc[4][2]
Definition: msmpeg4data.c:1807
uint8_t
#define av_cold
Definition: attributes.h:74
int ff_msmpeg4_decode_block(MpegEncContext *s, int16_t *block, int n, int coded, const uint8_t *scan_table)
Definition: msmpeg4dec.c:662
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:481
uint8_t ff_static_rl_table_store[NB_RL_TABLES][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: msmpeg4data.c:36
#define MBAC_BITRATE
Definition: msmpeg4.h:38
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:292
static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: msmpeg4dec.c:105
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:187
MSMPEG4 data tables.
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:213
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:45
#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:136
static int msmpeg4v1_pred_dc(MpegEncContext *s, int n, int32_t **dc_val_ptr)
Definition: msmpeg4dec.c:47
#define MAX_LEVEL
Definition: rl.h:35
int flipflop_rounding
Definition: mpegvideo.h:440
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:594
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:174
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 MPEG1
Definition: mpegvideo.h:192
static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: msmpeg4dec.c:206
int rl_chroma_table_index
Definition: mpegvideo.h:435
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:409
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:202
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:62
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:178
#define DC_VLC_BITS
Definition: msmpeg4dec.c:38
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int per_mb_rl_table
Definition: mpegvideo.h:442
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:40
GLsizei GLsizei * length
Definition: opengl_enc.c:115
const char * name
Name of the codec implementation.
Definition: avcodec.h:3489
GetBitContext gb
Definition: mpegvideo.h:451
int(* decode_mb)(struct MpegEncContext *s, int16_t block[6][64])
Definition: mpegvideo.h:502
#define CLOSE_READER(name, gb)
Definition: get_bits.h:145
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:63
Libavcodec external API header.
#define V2_INTRA_CBPC_VLC_BITS
Definition: msmpeg4dec.c:39
Definition: get_bits.h:64
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:189
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:62
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:266
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:409
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:851
const uint8_t ff_v2_mb_type[8][2]
Definition: msmpeg4data.c:1802
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:2900
const uint8_t * table_mvx
Definition: msmpeg4data.h:42
int width
picture width / height.
Definition: avcodec.h:1691
int32_t
const uint8_t * table_mv_bits
Definition: msmpeg4data.h:41
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:288
static int msmpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Definition: msmpeg4dec.c:600
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:68
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:195
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:561
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:93
int n
Definition: avisynth_c.h:547
const uint32_t ff_table1_dc_chroma[120][2]
Definition: msmpeg4data.c:201
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:47
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:207
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:572
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:937
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:274
BlockDSPContext bdsp
Definition: mpegvideo.h:233
int debug
debug
Definition: avcodec.h:2852
AVCodec ff_msmpeg4v2_decoder
Definition: msmpeg4dec.c:954
main external API structure.
Definition: avcodec.h:1512
static VLC v2_intra_cbpc_vlc
Definition: msmpeg4dec.c:68
ScanTable intra_scantable
Definition: mpegvideo.h:98
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:107
#define OPEN_READER(name, gb)
Definition: get_bits.h:134
const uint16_t * table_mv_code
Definition: msmpeg4data.h:40
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:37
#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:305
#define V2_MB_TYPE_VLC_BITS
Definition: msmpeg4dec.c:40
ScanTable intra_h_scantable
Definition: mpegvideo.h:99
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:298
#define GET_CACHE(name, gb)
Definition: get_bits.h:211
#define MB_INTRA_VLC_BITS
Definition: msmpeg4.h:35
int slice_height
in macroblocks
Definition: mpegvideo.h:438
#define MB_TYPE_16x16
Definition: avcodec.h:1144
int use_skip_mb_code
Definition: mpegvideo.h:437
AVCodec ff_wmv1_decoder
Definition: msmpeg4dec.c:988
MVTable ff_mv_tables[2]
Definition: msmpeg4data.c:1785
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:176
VLC vlc
Definition: msmpeg4data.h:45
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:338
#define MV_DIR_FORWARD
Definition: mpegvideo.h:270
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:219
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:245
static const uint8_t start_code[]
Definition: h264.c:1289
#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:69
uint8_t level
Definition: svq3.c:150
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2853
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:284
MpegEncContext.
Definition: mpegvideo.h:88
#define MAX_RUN
Definition: rl.h:34
struct AVCodecContext * avctx
Definition: mpegvideo.h:105
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:521
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:208
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:67
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:137
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2909
AVCodec ff_msmpeg4v3_decoder
Definition: msmpeg4dec.c:971
#define MV_VLC_BITS
Definition: msmpeg4dec.c:41
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:149
const uint32_t(*const [WMV2_INTER_CBP_TABLE_COUNT] ff_wmv2_inter_table)[2]
Definition: msmpeg4data.c:1980
void * priv_data
Definition: avcodec.h:1554
float re
Definition: fft-test.c:73
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:500
static int decode012(GetBitContext *gb)
Definition: get_bits.h:576
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
int64_t bit_rate
wanted bit rate
Definition: mpegvideo.h:110
int ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr)
Definition: msmpeg4dec.c:899
#define CONFIG_WMV2_DECODER
Definition: config.h:830
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2915
int rl_table_index
Definition: mpegvideo.h:434
int chroma_qscale
chroma QP
Definition: mpegvideo.h:212
#define av_uninit(x)
Definition: attributes.h:141
#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:43
VLC ff_msmp4_mb_i_vlc
Definition: msmpeg4data.c:38
ScanTable inter_scantable
if inter == intra then intra should be used to reduce tha cache usage
Definition: mpegvideo.h:97
int ff_msmpeg4_coded_block_pred(MpegEncContext *s, int n, uint8_t **coded_block_ptr)
Definition: msmpeg4.c:153
int mv_table_index
Definition: mpegvideo.h:433
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:383
int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: wmv2dec.c:350
AVPixelFormat
Pixel format.
Definition: pixfmt.h:65
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:857
const uint8_t ff_table_inter_intra[4][2]
Definition: msmpeg4data.c:1868
int dc_table_index
Definition: mpegvideo.h:436
VLC ff_msmp4_dc_luma_vlc[2]
Definition: msmpeg4data.c:39
#define MB_TYPE_L0
Definition: avcodec.h:1157
Predicted.
Definition: avutil.h:267
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:39
av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
Definition: msmpeg4dec.c:299
VLC ff_msmp4_dc_chroma_vlc[2]
Definition: msmpeg4data.c:40
const uint8_t ff_mvtab[33][2]
Definition: h263data.c:90
static int16_t block[64]
Definition: dct-test.c:110