FFmpeg  4.4.6
msmpeg4dec.c
Go to the documentation of this file.
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 TEX_VLC_BITS 9
42 
43 #define DEFAULT_INTER_INDEX 3
44 
45 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
46  int32_t **dc_val_ptr)
47 {
48  int i;
49 
50  if (n < 4) {
51  i= 0;
52  } else {
53  i= n-3;
54  }
55 
56  *dc_val_ptr= &s->last_dc[i];
57  return s->last_dc[i];
58 }
59 
60 /****************************************/
61 /* decoding stuff */
62 
69 
70 /* This is identical to H.263 except that its range is multiplied by 2. */
71 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
72 {
73  int code, val, sign, shift;
74 
76  ff_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
77  if (code < 0)
78  return 0xffff;
79 
80  if (code == 0)
81  return pred;
82  sign = get_bits1(&s->gb);
83  shift = f_code - 1;
84  val = code;
85  if (shift) {
86  val = (val - 1) << shift;
87  val |= get_bits(&s->gb, shift);
88  val++;
89  }
90  if (sign)
91  val = -val;
92 
93  val += pred;
94  if (val <= -64)
95  val += 64;
96  else if (val >= 64)
97  val -= 64;
98 
99  return val;
100 }
101 
102 static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
103 {
104  int cbp, code, i;
105  uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
106 
107  if (s->pict_type == AV_PICTURE_TYPE_P) {
108  if (s->use_skip_mb_code) {
109  if (get_bits1(&s->gb)) {
110  /* skip mb */
111  s->mb_intra = 0;
112  for(i=0;i<6;i++)
113  s->block_last_index[i] = -1;
114  s->mv_dir = MV_DIR_FORWARD;
115  s->mv_type = MV_TYPE_16X16;
116  s->mv[0][0][0] = 0;
117  s->mv[0][0][1] = 0;
118  s->mb_skipped = 1;
119  *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
120  return 0;
121  }
122  }
123 
124  if(s->msmpeg4_version==2)
126  else
128  if(code<0 || code>7){
129  av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
130  return -1;
131  }
132 
133  s->mb_intra = code >>2;
134 
135  cbp = code & 0x3;
136  } else {
137  s->mb_intra = 1;
138  if(s->msmpeg4_version==2)
140  else
142  if(cbp<0 || cbp>3){
143  av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
144  return -1;
145  }
146  }
147 
148  if (!s->mb_intra) {
149  int mx, my, cbpy;
150 
151  cbpy= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
152  if(cbpy<0){
153  av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
154  return -1;
155  }
156 
157  cbp|= cbpy<<2;
158  if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
159 
160  ff_h263_pred_motion(s, 0, 0, &mx, &my);
161  mx= msmpeg4v2_decode_motion(s, mx, 1);
162  my= msmpeg4v2_decode_motion(s, my, 1);
163 
164  s->mv_dir = MV_DIR_FORWARD;
165  s->mv_type = MV_TYPE_16X16;
166  s->mv[0][0][0] = mx;
167  s->mv[0][0][1] = my;
168  *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
169  } else {
170  int v;
171  if(s->msmpeg4_version==2){
172  s->ac_pred = get_bits1(&s->gb);
174  if (v < 0) {
175  av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
176  return -1;
177  }
178  cbp|= v<<2;
179  } else{
180  s->ac_pred = 0;
182  if (v < 0) {
183  av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
184  return -1;
185  }
186  cbp|= v<<2;
187  if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
188  }
189  *mb_type_ptr = MB_TYPE_INTRA;
190  }
191 
192  s->bdsp.clear_blocks(s->block[0]);
193  for (i = 0; i < 6; i++) {
194  if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
195  {
196  av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
197  return -1;
198  }
199  }
200  return 0;
201 }
202 
203 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
204 {
205  int cbp, code, i;
206  uint8_t *coded_val;
207  uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
208 
209  if (get_bits_left(&s->gb) <= 0)
210  return AVERROR_INVALIDDATA;
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 
231  //s->mb_intra = (code & 0x40) ? 0 : 1;
232  s->mb_intra = (~code & 0x40) >> 6;
233 
234  cbp = code & 0x3f;
235  } else {
236  s->mb_intra = 1;
238  /* predict coded block pattern */
239  cbp = 0;
240  for(i=0;i<6;i++) {
241  int val = ((code >> (5 - i)) & 1);
242  if (i < 4) {
243  int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
244  val = val ^ pred;
245  *coded_val = val;
246  }
247  cbp |= val << (5 - i);
248  }
249  }
250 
251  if (!s->mb_intra) {
252  int mx, my;
253  if(s->per_mb_rl_table && cbp){
254  s->rl_table_index = decode012(&s->gb);
255  s->rl_chroma_table_index = s->rl_table_index;
256  }
257  ff_h263_pred_motion(s, 0, 0, &mx, &my);
258  ff_msmpeg4_decode_motion(s, &mx, &my);
259  s->mv_dir = MV_DIR_FORWARD;
260  s->mv_type = MV_TYPE_16X16;
261  s->mv[0][0][0] = mx;
262  s->mv[0][0][1] = my;
263  *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
264  } else {
265  ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
266  ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
267  show_bits(&s->gb, 24));
268  s->ac_pred = get_bits1(&s->gb);
269  *mb_type_ptr = MB_TYPE_INTRA;
270  if(s->inter_intra_pred){
271  s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
272  ff_dlog(s, "%d%d %d %d/",
273  s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
274  }
275  if(s->per_mb_rl_table && cbp){
276  s->rl_table_index = decode012(&s->gb);
277  s->rl_chroma_table_index = s->rl_table_index;
278  }
279  }
280 
281  s->bdsp.clear_blocks(s->block[0]);
282  for (i = 0; i < 6; i++) {
283  if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
284  {
285  av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
286  return -1;
287  }
288  }
289 
290  return 0;
291 }
292 
293 /* init all vlc decoding tables */
295 {
296  MpegEncContext *s = avctx->priv_data;
297  static volatile int done = 0;
298  int i, ret;
299  MVTable *mv;
300 
301  if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
302  return ret;
303 
304  if (ff_h263_decode_init(avctx) < 0)
305  return -1;
306 
308 
309  if (!done) {
310  for(i=0;i<NB_RL_TABLES;i++) {
312  }
314  INIT_FIRST_VLC_RL(ff_rl_table[1], 1104);
316  INIT_VLC_RL(ff_rl_table[3], 940);
317  INIT_VLC_RL(ff_rl_table[4], 962);
318  /* ff_rl_table[5] coincides with ff_h263_rl_inter which has just been
319  * initialized in ff_h263_decode_init() above. So just copy the VLCs. */
322 
323  mv = &ff_mv_tables[0];
325  mv->table_mv_bits, 1, 1,
326  mv->table_mv_code, 2, 2, 3714);
327  mv = &ff_mv_tables[1];
329  mv->table_mv_bits, 1, 1,
330  mv->table_mv_code, 2, 2, 2694);
331 
333  &ff_table0_dc_lum[0][1], 8, 4,
334  &ff_table0_dc_lum[0][0], 8, 4, 1158);
336  &ff_table0_dc_chroma[0][1], 8, 4,
337  &ff_table0_dc_chroma[0][0], 8, 4, 1118);
339  &ff_table1_dc_lum[0][1], 8, 4,
340  &ff_table1_dc_lum[0][0], 8, 4, 1476);
342  &ff_table1_dc_chroma[0][1], 8, 4,
343  &ff_table1_dc_chroma[0][0], 8, 4, 1216);
344 
346  &ff_v2_dc_lum_table[0][1], 8, 4,
347  &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
349  &ff_v2_dc_chroma_table[0][1], 8, 4,
350  &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
351 
353  &ff_v2_intra_cbpc[0][1], 2, 1,
354  &ff_v2_intra_cbpc[0][0], 2, 1, 8);
356  &ff_v2_mb_type[0][1], 2, 1,
357  &ff_v2_mb_type[0][0], 2, 1, 128);
358 
360  &ff_wmv2_inter_table[0][0][1], 8, 4,
361  &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
363  &ff_wmv2_inter_table[1][0][1], 8, 4,
364  &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
366  &ff_wmv2_inter_table[2][0][1], 8, 4,
367  &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
369  &ff_wmv2_inter_table[3][0][1], 8, 4,
370  &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
371 
373  &ff_msmp4_mb_i_table[0][1], 4, 2,
374  &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
375 
377  &ff_table_inter_intra[0][1], 2, 1,
378  &ff_table_inter_intra[0][0], 2, 1, 8);
379  done = 1;
380  }
381 
382  switch(s->msmpeg4_version){
383  case 1:
384  case 2:
385  s->decode_mb= msmpeg4v12_decode_mb;
386  break;
387  case 3:
388  case 4:
389  s->decode_mb= msmpeg4v34_decode_mb;
390  break;
391  case 5:
393  s->decode_mb= ff_wmv2_decode_mb;
394  case 6:
395  //FIXME + TODO VC1 decode mb
396  break;
397  }
398 
399  s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
400 
401  return 0;
402 }
403 
405 {
406  int code;
407 
408  // at minimum one bit per macroblock is required at least in a valid frame,
409  // we discard frames much smaller than this. Frames smaller than 1/8 of the
410  // smallest "black/skip" frame generally contain not much recoverable content
411  // while at the same time they have the highest computational requirements
412  // per byte
413  if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
414  return AVERROR_INVALIDDATA;
415 
416  if(s->msmpeg4_version==1){
417  int start_code = get_bits_long(&s->gb, 32);
418  if(start_code!=0x00000100){
419  av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
420  return -1;
421  }
422 
423  skip_bits(&s->gb, 5); // frame number */
424  }
425 
426  s->pict_type = get_bits(&s->gb, 2) + 1;
427  if (s->pict_type != AV_PICTURE_TYPE_I &&
428  s->pict_type != AV_PICTURE_TYPE_P){
429  av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
430  return -1;
431  }
432  s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
433  if(s->qscale==0){
434  av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
435  return -1;
436  }
437 
438  if (s->pict_type == AV_PICTURE_TYPE_I) {
439  code = get_bits(&s->gb, 5);
440  if(s->msmpeg4_version==1){
441  if(code==0 || code>s->mb_height){
442  av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
443  return -1;
444  }
445 
446  s->slice_height = code;
447  }else{
448  /* 0x17: one slice, 0x18: two slices, ... */
449  if (code < 0x17){
450  av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
451  return -1;
452  }
453 
454  s->slice_height = s->mb_height / (code - 0x16);
455  }
456 
457  switch(s->msmpeg4_version){
458  case 1:
459  case 2:
460  s->rl_chroma_table_index = 2;
461  s->rl_table_index = 2;
462 
463  s->dc_table_index = 0; //not used
464  break;
465  case 3:
466  s->rl_chroma_table_index = decode012(&s->gb);
467  s->rl_table_index = decode012(&s->gb);
468 
469  s->dc_table_index = get_bits1(&s->gb);
470  break;
471  case 4:
472  ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
473 
474  if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
475  else s->per_mb_rl_table= 0;
476 
477  if(!s->per_mb_rl_table){
478  s->rl_chroma_table_index = decode012(&s->gb);
479  s->rl_table_index = decode012(&s->gb);
480  }
481 
482  s->dc_table_index = get_bits1(&s->gb);
483  s->inter_intra_pred= 0;
484  break;
485  }
486  s->no_rounding = 1;
487  if(s->avctx->debug&FF_DEBUG_PICT_INFO)
488  av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
489  s->qscale,
490  s->rl_chroma_table_index,
491  s->rl_table_index,
492  s->dc_table_index,
493  s->per_mb_rl_table,
494  s->slice_height);
495  } else {
496  switch(s->msmpeg4_version){
497  case 1:
498  case 2:
499  if(s->msmpeg4_version==1)
500  s->use_skip_mb_code = 1;
501  else
502  s->use_skip_mb_code = get_bits1(&s->gb);
503  s->rl_table_index = 2;
504  s->rl_chroma_table_index = s->rl_table_index;
505  s->dc_table_index = 0; //not used
506  s->mv_table_index = 0;
507  break;
508  case 3:
509  s->use_skip_mb_code = get_bits1(&s->gb);
510  s->rl_table_index = decode012(&s->gb);
511  s->rl_chroma_table_index = s->rl_table_index;
512 
513  s->dc_table_index = get_bits1(&s->gb);
514 
515  s->mv_table_index = get_bits1(&s->gb);
516  break;
517  case 4:
518  s->use_skip_mb_code = get_bits1(&s->gb);
519 
520  if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
521  else s->per_mb_rl_table= 0;
522 
523  if(!s->per_mb_rl_table){
524  s->rl_table_index = decode012(&s->gb);
525  s->rl_chroma_table_index = s->rl_table_index;
526  }
527 
528  s->dc_table_index = get_bits1(&s->gb);
529 
530  s->mv_table_index = get_bits1(&s->gb);
531  s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
532  break;
533  }
534 
535  if(s->avctx->debug&FF_DEBUG_PICT_INFO)
536  av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
537  s->use_skip_mb_code,
538  s->rl_table_index,
539  s->rl_chroma_table_index,
540  s->dc_table_index,
541  s->mv_table_index,
542  s->per_mb_rl_table,
543  s->qscale);
544 
545  if(s->flipflop_rounding){
546  s->no_rounding ^= 1;
547  }else{
548  s->no_rounding = 0;
549  }
550  }
551  ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
552  s->inter_intra_pred, s->width, s->height);
553 
554  s->esc3_level_length= 0;
555  s->esc3_run_length= 0;
556 
557  return 0;
558 }
559 
561 {
562  int left= buf_size*8 - get_bits_count(&s->gb);
563  int length= s->msmpeg4_version>=3 ? 17 : 16;
564  /* the alt_bitstream reader could read over the end so we need to check it */
565  if(left>=length && left<length+8)
566  {
567  skip_bits(&s->gb, 5); /* fps */
568  s->bit_rate= get_bits(&s->gb, 11)*1024;
569  if(s->msmpeg4_version>=3)
570  s->flipflop_rounding= get_bits1(&s->gb);
571  else
572  s->flipflop_rounding= 0;
573  }
574  else if(left<length+8)
575  {
576  s->flipflop_rounding= 0;
577  if(s->msmpeg4_version != 2)
578  av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
579  }
580  else
581  {
582  av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
583  }
584 
585  return 0;
586 }
587 
588 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
589 {
590  int level, pred;
591 
592  if(s->msmpeg4_version<=2){
593  if (n < 4) {
595  } else {
597  }
598  if (level < 0) {
599  av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
600  *dir_ptr = 0;
601  return -1;
602  }
603  level-=256;
604  }else{ //FIXME optimize use unified tables & index
605  if (n < 4) {
606  level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
607  } else {
608  level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
609  }
610 
611  if (level == DC_MAX) {
612  level = get_bits(&s->gb, 8);
613  if (get_bits1(&s->gb))
614  level = -level;
615  } else if (level != 0) {
616  if (get_bits1(&s->gb))
617  level = -level;
618  }
619  }
620 
621  if(s->msmpeg4_version==1){
622  int32_t *dc_val;
623  pred = msmpeg4v1_pred_dc(s, n, &dc_val);
624  level += pred;
625 
626  /* update predictor */
627  *dc_val= level;
628  }else{
629  int16_t *dc_val;
630  pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
631  level += pred;
632 
633  /* update predictor */
634  if (n < 4) {
635  *dc_val = level * s->y_dc_scale;
636  } else {
637  *dc_val = level * s->c_dc_scale;
638  }
639  }
640 
641  return level;
642 }
643 
645  int n, int coded, const uint8_t *scan_table)
646 {
647  int level, i, last, run, run_diff;
648  int av_uninit(dc_pred_dir);
649  RLTable *rl;
651  int qmul, qadd;
652 
653  if (s->mb_intra) {
654  qmul=1;
655  qadd=0;
656 
657  /* DC coef */
658  level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
659 
660  if (level < 0){
661  av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
662  if(s->inter_intra_pred) level=0;
663  }
664  if (n < 4) {
665  rl = &ff_rl_table[s->rl_table_index];
666  if(level > 256*s->y_dc_scale){
667  av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
668  if(!s->inter_intra_pred) return -1;
669  }
670  } else {
671  rl = &ff_rl_table[3 + s->rl_chroma_table_index];
672  if(level > 256*s->c_dc_scale){
673  av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
674  if(!s->inter_intra_pred) return -1;
675  }
676  }
677  block[0] = level;
678 
679  run_diff = s->msmpeg4_version >= 4;
680  i = 0;
681  if (!coded) {
682  goto not_coded;
683  }
684  if (s->ac_pred) {
685  if (dc_pred_dir == 0)
686  scan_table = s->intra_v_scantable.permutated; /* left */
687  else
688  scan_table = s->intra_h_scantable.permutated; /* top */
689  } else {
690  scan_table = s->intra_scantable.permutated;
691  }
692  rl_vlc= rl->rl_vlc[0];
693  } else {
694  qmul = s->qscale << 1;
695  qadd = (s->qscale - 1) | 1;
696  i = -1;
697  rl = &ff_rl_table[3 + s->rl_table_index];
698 
699  if(s->msmpeg4_version==2)
700  run_diff = 0;
701  else
702  run_diff = 1;
703 
704  if (!coded) {
705  s->block_last_index[n] = i;
706  return 0;
707  }
708  if(!scan_table)
709  scan_table = s->inter_scantable.permutated;
710  rl_vlc= rl->rl_vlc[s->qscale];
711  }
712  {
713  OPEN_READER(re, &s->gb);
714  for(;;) {
715  UPDATE_CACHE(re, &s->gb);
716  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
717  if (level==0) {
718  int cache;
719  cache= GET_CACHE(re, &s->gb);
720  /* escape */
721  if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
722  if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
723  /* third escape */
724  if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
725  UPDATE_CACHE(re, &s->gb);
726  if(s->msmpeg4_version<=3){
727  last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
728  run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
729  level= SHOW_SBITS(re, &s->gb, 8);
730  SKIP_COUNTER(re, &s->gb, 1+6+8);
731  }else{
732  int sign;
733  last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
734  if(!s->esc3_level_length){
735  int ll;
736  ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
737  show_bits(&s->gb, 24), s->mb_x, s->mb_y);
738  if(s->qscale<8){
739  ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
740  if(ll==0){
741  ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
742  }
743  }else{
744  ll=2;
745  while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
746  ll++;
747  SKIP_BITS(re, &s->gb, 1);
748  }
749  if(ll<8) SKIP_BITS(re, &s->gb, 1);
750  }
751 
752  s->esc3_level_length= ll;
753  s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
754  UPDATE_CACHE(re, &s->gb);
755  }
756  run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
757  SKIP_BITS(re, &s->gb, s->esc3_run_length);
758 
759  sign= SHOW_UBITS(re, &s->gb, 1);
760  SKIP_BITS(re, &s->gb, 1);
761 
762  level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
763  SKIP_BITS(re, &s->gb, s->esc3_level_length);
764  if(sign) level= -level;
765  }
766 
767  //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
768  if (level>0) level= level * qmul + qadd;
769  else level= level * qmul - qadd;
770  i+= run + 1;
771  if(last) i+=192;
772  } else {
773  /* second escape */
774  SKIP_BITS(re, &s->gb, 2);
775  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
776  i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
777  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
778  LAST_SKIP_BITS(re, &s->gb, 1);
779  }
780  } else {
781  /* first escape */
782  SKIP_BITS(re, &s->gb, 1);
783  GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
784  i+= run;
785  level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
786  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
787  LAST_SKIP_BITS(re, &s->gb, 1);
788  }
789  } else {
790  i+= run;
791  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
792  LAST_SKIP_BITS(re, &s->gb, 1);
793  }
794  if (i > 62){
795  i-= 192;
796  if(i&(~63)){
797  const int left= get_bits_left(&s->gb);
798  if (((i + 192 == 64 && level / qmul == -1) ||
799  !(s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&
800  left >= 0) {
801  av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
802  i = 63;
803  break;
804  }else{
805  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
806  return -1;
807  }
808  }
809 
810  block[scan_table[i]] = level;
811  break;
812  }
813 
814  block[scan_table[i]] = level;
815  }
816  CLOSE_READER(re, &s->gb);
817  }
818  not_coded:
819  if (s->mb_intra) {
820  ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
821  if (s->ac_pred) {
822  i = 63; /* XXX: not optimal */
823  }
824  }
825  if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
826  s->block_last_index[n] = i;
827 
828  return 0;
829 }
830 
831 void ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr)
832 {
833  MVTable *mv;
834  int code, mx, my;
835 
836  mv = &ff_mv_tables[s->mv_table_index];
837 
838  code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
840  mx = get_bits(&s->gb, 6);
841  my = get_bits(&s->gb, 6);
842  } else {
843  mx = mv->table_mvx[code];
844  my = mv->table_mvy[code];
845  }
846 
847  mx += *mx_ptr - 32;
848  my += *my_ptr - 32;
849  /* WARNING : they do not do exactly modulo encoding */
850  if (mx <= -64)
851  mx += 64;
852  else if (mx >= 64)
853  mx -= 64;
854 
855  if (my <= -64)
856  my += 64;
857  else if (my >= 64)
858  my -= 64;
859  *mx_ptr = mx;
860  *my_ptr = my;
861 }
862 
864  .name = "msmpeg4v1",
865  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
866  .type = AVMEDIA_TYPE_VIDEO,
867  .id = AV_CODEC_ID_MSMPEG4V1,
868  .priv_data_size = sizeof(MpegEncContext),
870  .close = ff_h263_decode_end,
873  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
874  .max_lowres = 3,
875  .pix_fmts = (const enum AVPixelFormat[]) {
878  },
879 };
880 
882  .name = "msmpeg4v2",
883  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
884  .type = AVMEDIA_TYPE_VIDEO,
885  .id = AV_CODEC_ID_MSMPEG4V2,
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 = "msmpeg4",
901  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
902  .type = AVMEDIA_TYPE_VIDEO,
903  .id = AV_CODEC_ID_MSMPEG4V3,
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 = "wmv1",
919  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
920  .type = AVMEDIA_TYPE_VIDEO,
921  .id = AV_CODEC_ID_WMV1,
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 };
static double val(void *priv, double ch)
Definition: aeval.c:76
#define av_uninit(x)
Definition: attributes.h:154
#define av_cold
Definition: attributes.h:88
uint8_t
int32_t
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
Libavcodec external API header.
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:1658
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:1664
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1628
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define s(width, name)
Definition: cbs_vp9.c:257
#define CONFIG_WMV2_DECODER
Definition: config.h:1009
#define NULL
Definition: coverity.c:32
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
float re
Definition: fft.c:82
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
static int decode012(GetBitContext *gb)
Definition: get_bits.h:831
#define GET_CACHE(name, gb)
Definition: get_bits.h:215
#define SKIP_CACHE(name, gb, num)
Definition: get_bits.h:180
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
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:193
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:738
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
#define SKIP_COUNTER(name, gb, num)
Definition: get_bits.h:185
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: codec.h:44
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
@ AV_CODEC_ID_MSMPEG4V1
Definition: codec_id.h:63
@ AV_CODEC_ID_MSMPEG4V2
Definition: codec_id.h:64
@ AV_CODEC_ID_WMV1
Definition: codec_id.h:66
@ AV_CODEC_ID_MSMPEG4V3
Definition: codec_id.h:65
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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:317
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:319
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:98
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:100
#define CBPY_VLC_BITS
Definition: h263.h:40
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:422
#define INTRA_MCBPC_VLC_BITS
Definition: h263.h:38
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:156
VLC ff_h263_mv_vlc
Definition: ituh263dec.c:101
#define H263_MV_VLC_BITS
Definition: h263.h:37
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:70
#define INTER_MCBPC_VLC_BITS
Definition: h263.h:39
RLTable ff_h263_rl_inter
Definition: h263data.c:159
misc image utilities
int i
Definition: input.c:407
static const int8_t mv[256][2]
Definition: 4xm.c:78
#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:61
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:309
static VLC rl_vlc[2]
Definition: mobiclip.c:276
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:71
#define MB_TYPE_SKIP
Definition: mpegutils.h:62
#define MB_TYPE_INTRA
Definition: mpegutils.h:73
#define MB_TYPE_16x16
Definition: mpegutils.h:54
#define MB_TYPE_L0
Definition: mpegutils.h:67
mpegvideo header.
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
av_cold void ff_msmpeg4_common_init(MpegEncContext *s)
Definition: msmpeg4.c:109
int ff_msmpeg4_pred_dc(MpegEncContext *s, int n, int16_t **dc_val_ptr, int *dir_ptr)
Definition: msmpeg4.c:193
int ff_msmpeg4_coded_block_pred(MpegEncContext *s, int n, uint8_t **coded_block_ptr)
Definition: msmpeg4.c:153
#define INTER_INTRA_VLC_BITS
Definition: msmpeg4.h:33
#define II_BITRATE
Definition: msmpeg4.h:37
#define MB_NON_INTRA_VLC_BITS
Definition: msmpeg4.h:34
#define MB_INTRA_VLC_BITS
Definition: msmpeg4.h:35
#define DC_MAX
Definition: msmpeg4.h:40
#define MBAC_BITRATE
Definition: msmpeg4.h:38
const uint32_t ff_table1_dc_chroma[120][2]
Definition: msmpeg4data.c:201
uint32_t ff_v2_dc_chroma_table[512][2]
Definition: msmpeg4data.c:35
uint8_t ff_static_rl_table_store[NB_RL_TABLES][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: msmpeg4data.c:36
uint32_t ff_v2_dc_lum_table[512][2]
Definition: msmpeg4data.c:34
MVTable ff_mv_tables[2]
Definition: msmpeg4data.c:1773
VLC ff_msmp4_dc_chroma_vlc[2]
Definition: msmpeg4data.c:40
const uint16_t ff_msmp4_mb_i_table[64][2]
Definition: msmpeg4data.c:43
const uint32_t ff_table0_dc_lum[120][2]
Definition: msmpeg4data.c:100
RLTable ff_rl_table[NB_RL_TABLES]
Definition: msmpeg4data.c:601
const uint32_t ff_table0_dc_chroma[120][2]
Definition: msmpeg4data.c:133
const uint8_t ff_v2_mb_type[8][2]
Definition: msmpeg4data.c:1784
VLC ff_msmp4_dc_luma_vlc[2]
Definition: msmpeg4data.c:39
const uint8_t ff_table_inter_intra[4][2]
Definition: msmpeg4data.c:1842
const uint32_t(*const [WMV2_INTER_CBP_TABLE_COUNT] ff_wmv2_inter_table)[2]
Definition: msmpeg4data.c:1954
const uint32_t ff_table1_dc_lum[120][2]
Definition: msmpeg4data.c:168
VLC ff_msmp4_mb_i_vlc
Definition: msmpeg4data.c:38
const uint8_t ff_v2_intra_cbpc[4][2]
Definition: msmpeg4data.c:1789
MSMPEG4 data tables.
#define NB_RL_TABLES
Definition: msmpeg4data.h:59
#define MSMPEG4_MV_TABLES_NB_ELEMS
Definition: msmpeg4data.h:71
#define TEX_VLC_BITS
Definition: msmpeg4dec.c:41
static VLC v2_intra_cbpc_vlc
Definition: msmpeg4dec.c:66
av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
Definition: msmpeg4dec.c:294
VLC ff_mb_non_intra_vlc[4]
Definition: msmpeg4dec.c:63
void ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr)
Definition: msmpeg4dec.c:831
static VLC v2_dc_chroma_vlc
Definition: msmpeg4dec.c:65
static VLC v2_mb_type_vlc
Definition: msmpeg4dec.c:67
int ff_msmpeg4_decode_block(MpegEncContext *s, int16_t *block, int n, int coded, const uint8_t *scan_table)
Definition: msmpeg4dec.c:644
static int msmpeg4v1_pred_dc(MpegEncContext *s, int n, int32_t **dc_val_ptr)
Definition: msmpeg4dec.c:45
static int msmpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
Definition: msmpeg4dec.c:588
#define MV_VLC_BITS
Definition: msmpeg4dec.c:40
AVCodec ff_msmpeg4v2_decoder
Definition: msmpeg4dec.c:881
AVCodec ff_msmpeg4v3_decoder
Definition: msmpeg4dec.c:899
#define DEFAULT_INTER_INDEX
Definition: msmpeg4dec.c:43
static int msmpeg4v2_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: msmpeg4dec.c:71
static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: msmpeg4dec.c:102
VLC ff_inter_intra_vlc
Definition: msmpeg4dec.c:68
#define V2_INTRA_CBPC_VLC_BITS
Definition: msmpeg4dec.c:38
#define V2_MB_TYPE_VLC_BITS
Definition: msmpeg4dec.c:39
#define DC_VLC_BITS
Definition: msmpeg4dec.c:37
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size)
Definition: msmpeg4dec.c:560
int ff_msmpeg4_decode_picture_header(MpegEncContext *s)
Definition: msmpeg4dec.c:404
AVCodec ff_msmpeg4v1_decoder
Definition: msmpeg4dec.c:863
static VLC v2_dc_lum_vlc
Definition: msmpeg4dec.c:64
static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: msmpeg4dec.c:203
AVCodec ff_wmv1_decoder
Definition: msmpeg4dec.c:917
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
av_cold void ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:28
#define INIT_VLC_RL(rl, static_size)
Definition: rl.h:58
#define INIT_FIRST_VLC_RL(rl, static_size)
Definition: rl.h:71
static const float pred[4]
Definition: siprdata.h:259
static int shift(int a, int b)
Definition: sonic.c:82
const uint8_t * code
Definition: spdifenc.c:413
main external API structure.
Definition: avcodec.h:536
int width
picture width / height.
Definition: avcodec.h:709
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
MpegEncContext.
Definition: mpegvideo.h:81
RLTable.
Definition: rl.h:39
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
Definition: vlc.h:26
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
uint8_t run
Definition: svq3.c:205
uint8_t level
Definition: svq3.c:206
#define ff_dlog(a,...)
#define av_log(a,...)
static int16_t block[64]
Definition: dct.c:116
VC-1 tables.
static const uint8_t start_code[]
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:120
int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: wmv2dec.c:378