FFmpeg
mpeg12dec.c
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1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27 
28 #include "config_components.h"
29 
30 #define UNCHECKED_BITSTREAM_READER 1
31 #include <inttypes.h>
32 
33 #include "libavutil/attributes.h"
34 #include "libavutil/emms.h"
35 #include "libavutil/imgutils.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/mem_internal.h"
38 #include "libavutil/reverse.h"
39 #include "libavutil/stereo3d.h"
40 #include "libavutil/timecode.h"
41 
42 #include "avcodec.h"
43 #include "codec_internal.h"
44 #include "decode.h"
45 #include "error_resilience.h"
46 #include "hwaccel_internal.h"
47 #include "hwconfig.h"
48 #include "idctdsp.h"
49 #include "internal.h"
50 #include "mpeg_er.h"
51 #include "mpeg12.h"
52 #include "mpeg12codecs.h"
53 #include "mpeg12data.h"
54 #include "mpeg12dec.h"
55 #include "mpegutils.h"
56 #include "mpegvideo.h"
57 #include "mpegvideodata.h"
58 #include "mpegvideodec.h"
59 #include "profiles.h"
60 #include "startcode.h"
61 #include "thread.h"
62 
63 #define A53_MAX_CC_COUNT 2000
64 
65 typedef struct Mpeg1Context {
66  MpegEncContext mpeg_enc_ctx;
67  int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
68  int repeat_field; /* true if we must repeat the field */
69  AVPanScan pan_scan; /* some temporary storage for the panscan */
70  AVStereo3D stereo3d;
71  int has_stereo3d;
72  AVBufferRef *a53_buf_ref;
73  uint8_t afd;
74  int has_afd;
75  int slice_count;
76  unsigned aspect_ratio_info;
77  AVRational save_aspect;
78  int save_width, save_height, save_progressive_seq;
79  AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
80  unsigned frame_rate_index;
81  int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
82  int closed_gop;
83  int tmpgexs;
84  int first_slice;
85  int extradata_decoded;
86  int64_t timecode_frame_start; /*< GOP timecode frame start number, in non drop frame format */
87 } Mpeg1Context;
88 
89 #define MB_TYPE_ZERO_MV 0x20000000
90 
91 static const uint32_t ptype2mb_type[7] = {
92  MB_TYPE_INTRA,
93  MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
94  MB_TYPE_L0,
95  MB_TYPE_L0 | MB_TYPE_CBP,
96  MB_TYPE_QUANT | MB_TYPE_INTRA,
97  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
98  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
99 };
100 
101 static const uint32_t btype2mb_type[11] = {
102  MB_TYPE_INTRA,
103  MB_TYPE_L1,
104  MB_TYPE_L1 | MB_TYPE_CBP,
105  MB_TYPE_L0,
106  MB_TYPE_L0 | MB_TYPE_CBP,
107  MB_TYPE_L0L1,
108  MB_TYPE_L0L1 | MB_TYPE_CBP,
109  MB_TYPE_QUANT | MB_TYPE_INTRA,
110  MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
111  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
112  MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
113 };
114 
115 /* as H.263, but only 17 codes */
116 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
117 {
118  int code, sign, val, shift;
119 
120  code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
121  if (code == 0)
122  return pred;
123  if (code < 0)
124  return 0xffff;
125 
126  sign = get_bits1(&s->gb);
127  shift = fcode - 1;
128  val = code;
129  if (shift) {
130  val = (val - 1) << shift;
131  val |= get_bits(&s->gb, shift);
132  val++;
133  }
134  if (sign)
135  val = -val;
136  val += pred;
137 
138  /* modulo decoding */
139  return sign_extend(val, 5 + shift);
140 }
141 
142 #define MAX_INDEX (64 - 1)
143 #define check_scantable_index(ctx, x) \
144  do { \
145  if ((x) > MAX_INDEX) { \
146  av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
147  ctx->mb_x, ctx->mb_y); \
148  return AVERROR_INVALIDDATA; \
149  } \
150  } while (0)
151 
152 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
153  int16_t *block, int n)
154 {
155  int level, i, j, run;
156  uint8_t *const scantable = s->intra_scantable.permutated;
157  const uint16_t *quant_matrix = s->inter_matrix;
158  const int qscale = s->qscale;
159 
160  {
161  OPEN_READER(re, &s->gb);
162  i = -1;
163  // special case for first coefficient, no need to add second VLC table
164  UPDATE_CACHE(re, &s->gb);
165  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
166  level = (3 * qscale * quant_matrix[0]) >> 5;
167  level = (level - 1) | 1;
168  if (GET_CACHE(re, &s->gb) & 0x40000000)
169  level = -level;
170  block[0] = level;
171  i++;
172  SKIP_BITS(re, &s->gb, 2);
173  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
174  goto end;
175  }
176  /* now quantify & encode AC coefficients */
177  for (;;) {
178  GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc,
179  TEX_VLC_BITS, 2, 0);
180 
181  if (level != 0) {
182  i += run;
183  if (i > MAX_INDEX)
184  break;
185  j = scantable[i];
186  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
187  level = (level - 1) | 1;
188  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
189  SHOW_SBITS(re, &s->gb, 1);
190  SKIP_BITS(re, &s->gb, 1);
191  } else {
192  /* escape */
193  run = SHOW_UBITS(re, &s->gb, 6) + 1;
194  LAST_SKIP_BITS(re, &s->gb, 6);
195  UPDATE_CACHE(re, &s->gb);
196  level = SHOW_SBITS(re, &s->gb, 8);
197  SKIP_BITS(re, &s->gb, 8);
198  if (level == -128) {
199  level = SHOW_UBITS(re, &s->gb, 8) - 256;
200  SKIP_BITS(re, &s->gb, 8);
201  } else if (level == 0) {
202  level = SHOW_UBITS(re, &s->gb, 8);
203  SKIP_BITS(re, &s->gb, 8);
204  }
205  i += run;
206  if (i > MAX_INDEX)
207  break;
208  j = scantable[i];
209  if (level < 0) {
210  level = -level;
211  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
212  level = (level - 1) | 1;
213  level = -level;
214  } else {
215  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
216  level = (level - 1) | 1;
217  }
218  }
219 
220  block[j] = level;
221  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
222  break;
223  UPDATE_CACHE(re, &s->gb);
224  }
225 end:
226  LAST_SKIP_BITS(re, &s->gb, 2);
227  CLOSE_READER(re, &s->gb);
228  }
229 
230  check_scantable_index(s, i);
231 
232  s->block_last_index[n] = i;
233  return 0;
234 }
235 
236 /**
237  * Changing this would eat up any speed benefits it has.
238  * Do not use "fast" flag if you need the code to be robust.
239  */
240 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
241  int16_t *block, int n)
242 {
243  int level, i, j, run;
244  uint8_t *const scantable = s->intra_scantable.permutated;
245  const int qscale = s->qscale;
246 
247  {
248  OPEN_READER(re, &s->gb);
249  i = -1;
250  // Special case for first coefficient, no need to add second VLC table.
251  UPDATE_CACHE(re, &s->gb);
252  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
253  level = (3 * qscale) >> 1;
254  level = (level - 1) | 1;
255  if (GET_CACHE(re, &s->gb) & 0x40000000)
256  level = -level;
257  block[0] = level;
258  i++;
259  SKIP_BITS(re, &s->gb, 2);
260  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
261  goto end;
262  }
263 
264  /* now quantify & encode AC coefficients */
265  for (;;) {
266  GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc,
267  TEX_VLC_BITS, 2, 0);
268 
269  if (level != 0) {
270  i += run;
271  if (i > MAX_INDEX)
272  break;
273  j = scantable[i];
274  level = ((level * 2 + 1) * qscale) >> 1;
275  level = (level - 1) | 1;
276  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
277  SHOW_SBITS(re, &s->gb, 1);
278  SKIP_BITS(re, &s->gb, 1);
279  } else {
280  /* escape */
281  run = SHOW_UBITS(re, &s->gb, 6) + 1;
282  LAST_SKIP_BITS(re, &s->gb, 6);
283  UPDATE_CACHE(re, &s->gb);
284  level = SHOW_SBITS(re, &s->gb, 8);
285  SKIP_BITS(re, &s->gb, 8);
286  if (level == -128) {
287  level = SHOW_UBITS(re, &s->gb, 8) - 256;
288  SKIP_BITS(re, &s->gb, 8);
289  } else if (level == 0) {
290  level = SHOW_UBITS(re, &s->gb, 8);
291  SKIP_BITS(re, &s->gb, 8);
292  }
293  i += run;
294  if (i > MAX_INDEX)
295  break;
296  j = scantable[i];
297  if (level < 0) {
298  level = -level;
299  level = ((level * 2 + 1) * qscale) >> 1;
300  level = (level - 1) | 1;
301  level = -level;
302  } else {
303  level = ((level * 2 + 1) * qscale) >> 1;
304  level = (level - 1) | 1;
305  }
306  }
307 
308  block[j] = level;
309  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
310  break;
311  UPDATE_CACHE(re, &s->gb);
312  }
313 end:
314  LAST_SKIP_BITS(re, &s->gb, 2);
315  CLOSE_READER(re, &s->gb);
316  }
317 
318  check_scantable_index(s, i);
319 
320  s->block_last_index[n] = i;
321  return 0;
322 }
323 
324 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
325  int16_t *block, int n)
326 {
327  int level, i, j, run;
328  uint8_t *const scantable = s->intra_scantable.permutated;
329  const uint16_t *quant_matrix;
330  const int qscale = s->qscale;
331  int mismatch;
332 
333  mismatch = 1;
334 
335  {
336  OPEN_READER(re, &s->gb);
337  i = -1;
338  if (n < 4)
339  quant_matrix = s->inter_matrix;
340  else
341  quant_matrix = s->chroma_inter_matrix;
342 
343  // Special case for first coefficient, no need to add second VLC table.
344  UPDATE_CACHE(re, &s->gb);
345  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
346  level = (3 * qscale * quant_matrix[0]) >> 5;
347  if (GET_CACHE(re, &s->gb) & 0x40000000)
348  level = -level;
349  block[0] = level;
350  mismatch ^= level;
351  i++;
352  SKIP_BITS(re, &s->gb, 2);
353  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
354  goto end;
355  }
356 
357  /* now quantify & encode AC coefficients */
358  for (;;) {
359  GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc,
360  TEX_VLC_BITS, 2, 0);
361 
362  if (level != 0) {
363  i += run;
364  if (i > MAX_INDEX)
365  break;
366  j = scantable[i];
367  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
368  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
369  SHOW_SBITS(re, &s->gb, 1);
370  SKIP_BITS(re, &s->gb, 1);
371  } else {
372  /* escape */
373  run = SHOW_UBITS(re, &s->gb, 6) + 1;
374  LAST_SKIP_BITS(re, &s->gb, 6);
375  UPDATE_CACHE(re, &s->gb);
376  level = SHOW_SBITS(re, &s->gb, 12);
377  SKIP_BITS(re, &s->gb, 12);
378 
379  i += run;
380  if (i > MAX_INDEX)
381  break;
382  j = scantable[i];
383  if (level < 0) {
384  level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
385  level = -level;
386  } else {
387  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
388  }
389  }
390 
391  mismatch ^= level;
392  block[j] = level;
393  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
394  break;
395  UPDATE_CACHE(re, &s->gb);
396  }
397 end:
398  LAST_SKIP_BITS(re, &s->gb, 2);
399  CLOSE_READER(re, &s->gb);
400  }
401  block[63] ^= (mismatch & 1);
402 
403  check_scantable_index(s, i);
404 
405  s->block_last_index[n] = i;
406  return 0;
407 }
408 
409 /**
410  * Changing this would eat up any speed benefits it has.
411  * Do not use "fast" flag if you need the code to be robust.
412  */
413 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
414  int16_t *block, int n)
415 {
416  int level, i, j, run;
417  uint8_t *const scantable = s->intra_scantable.permutated;
418  const int qscale = s->qscale;
419  OPEN_READER(re, &s->gb);
420  i = -1;
421 
422  // special case for first coefficient, no need to add second VLC table
423  UPDATE_CACHE(re, &s->gb);
424  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
425  level = (3 * qscale) >> 1;
426  if (GET_CACHE(re, &s->gb) & 0x40000000)
427  level = -level;
428  block[0] = level;
429  i++;
430  SKIP_BITS(re, &s->gb, 2);
431  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
432  goto end;
433  }
434 
435  /* now quantify & encode AC coefficients */
436  for (;;) {
437  GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0);
438 
439  if (level != 0) {
440  i += run;
441  if (i > MAX_INDEX)
442  break;
443  j = scantable[i];
444  level = ((level * 2 + 1) * qscale) >> 1;
445  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
446  SHOW_SBITS(re, &s->gb, 1);
447  SKIP_BITS(re, &s->gb, 1);
448  } else {
449  /* escape */
450  run = SHOW_UBITS(re, &s->gb, 6) + 1;
451  LAST_SKIP_BITS(re, &s->gb, 6);
452  UPDATE_CACHE(re, &s->gb);
453  level = SHOW_SBITS(re, &s->gb, 12);
454  SKIP_BITS(re, &s->gb, 12);
455 
456  i += run;
457  if (i > MAX_INDEX)
458  break;
459  j = scantable[i];
460  if (level < 0) {
461  level = ((-level * 2 + 1) * qscale) >> 1;
462  level = -level;
463  } else {
464  level = ((level * 2 + 1) * qscale) >> 1;
465  }
466  }
467 
468  block[j] = level;
469  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
470  break;
471 
472  UPDATE_CACHE(re, &s->gb);
473  }
474 end:
475  LAST_SKIP_BITS(re, &s->gb, 2);
476  CLOSE_READER(re, &s->gb);
477 
478  check_scantable_index(s, i);
479 
480  s->block_last_index[n] = i;
481  return 0;
482 }
483 
484 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
485  int16_t *block, int n)
486 {
487  int level, dc, diff, i, j, run;
488  int component;
489  const RL_VLC_ELEM *rl_vlc;
490  uint8_t *const scantable = s->intra_scantable.permutated;
491  const uint16_t *quant_matrix;
492  const int qscale = s->qscale;
493  int mismatch;
494 
495  /* DC coefficient */
496  if (n < 4) {
497  quant_matrix = s->intra_matrix;
498  component = 0;
499  } else {
500  quant_matrix = s->chroma_intra_matrix;
501  component = (n & 1) + 1;
502  }
503  diff = decode_dc(&s->gb, component);
504  dc = s->last_dc[component];
505  dc += diff;
506  s->last_dc[component] = dc;
507  block[0] = dc * (1 << (3 - s->intra_dc_precision));
508  ff_tlog(s->avctx, "dc=%d\n", block[0]);
509  mismatch = block[0] ^ 1;
510  i = 0;
511  if (s->intra_vlc_format)
512  rl_vlc = ff_mpeg2_rl_vlc;
513  else
514  rl_vlc = ff_mpeg1_rl_vlc;
515 
516  {
517  OPEN_READER(re, &s->gb);
518  /* now quantify & encode AC coefficients */
519  for (;;) {
520  UPDATE_CACHE(re, &s->gb);
521  GET_RL_VLC(level, run, re, &s->gb, rl_vlc,
522  TEX_VLC_BITS, 2, 0);
523 
524  if (level == 127) {
525  break;
526  } else if (level != 0) {
527  i += run;
528  if (i > MAX_INDEX)
529  break;
530  j = scantable[i];
531  level = (level * qscale * quant_matrix[j]) >> 4;
532  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
533  SHOW_SBITS(re, &s->gb, 1);
534  LAST_SKIP_BITS(re, &s->gb, 1);
535  } else {
536  /* escape */
537  run = SHOW_UBITS(re, &s->gb, 6) + 1;
538  SKIP_BITS(re, &s->gb, 6);
539  level = SHOW_SBITS(re, &s->gb, 12);
540  LAST_SKIP_BITS(re, &s->gb, 12);
541  i += run;
542  if (i > MAX_INDEX)
543  break;
544  j = scantable[i];
545  if (level < 0) {
546  level = (-level * qscale * quant_matrix[j]) >> 4;
547  level = -level;
548  } else {
549  level = (level * qscale * quant_matrix[j]) >> 4;
550  }
551  }
552 
553  mismatch ^= level;
554  block[j] = level;
555  }
556  CLOSE_READER(re, &s->gb);
557  }
558  block[63] ^= mismatch & 1;
559 
560  check_scantable_index(s, i);
561 
562  s->block_last_index[n] = i;
563  return 0;
564 }
565 
566 /**
567  * Changing this would eat up any speed benefits it has.
568  * Do not use "fast" flag if you need the code to be robust.
569  */
570 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
571  int16_t *block, int n)
572 {
573  int level, dc, diff, i, j, run;
574  int component;
575  const RL_VLC_ELEM *rl_vlc;
576  uint8_t *const scantable = s->intra_scantable.permutated;
577  const uint16_t *quant_matrix;
578  const int qscale = s->qscale;
579 
580  /* DC coefficient */
581  if (n < 4) {
582  quant_matrix = s->intra_matrix;
583  component = 0;
584  } else {
585  quant_matrix = s->chroma_intra_matrix;
586  component = (n & 1) + 1;
587  }
588  diff = decode_dc(&s->gb, component);
589  dc = s->last_dc[component];
590  dc += diff;
591  s->last_dc[component] = dc;
592  block[0] = dc * (1 << (3 - s->intra_dc_precision));
593  i = 0;
594  if (s->intra_vlc_format)
595  rl_vlc = ff_mpeg2_rl_vlc;
596  else
597  rl_vlc = ff_mpeg1_rl_vlc;
598 
599  {
600  OPEN_READER(re, &s->gb);
601  /* now quantify & encode AC coefficients */
602  for (;;) {
603  UPDATE_CACHE(re, &s->gb);
604  GET_RL_VLC(level, run, re, &s->gb, rl_vlc,
605  TEX_VLC_BITS, 2, 0);
606 
607  if (level >= 64 || i > 63) {
608  break;
609  } else if (level != 0) {
610  i += run;
611  j = scantable[i];
612  level = (level * qscale * quant_matrix[j]) >> 4;
613  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
614  SHOW_SBITS(re, &s->gb, 1);
615  LAST_SKIP_BITS(re, &s->gb, 1);
616  } else {
617  /* escape */
618  run = SHOW_UBITS(re, &s->gb, 6) + 1;
619  SKIP_BITS(re, &s->gb, 6);
620  level = SHOW_SBITS(re, &s->gb, 12);
621  LAST_SKIP_BITS(re, &s->gb, 12);
622  i += run;
623  j = scantable[i];
624  if (level < 0) {
625  level = (-level * qscale * quant_matrix[j]) >> 4;
626  level = -level;
627  } else {
628  level = (level * qscale * quant_matrix[j]) >> 4;
629  }
630  }
631 
632  block[j] = level;
633  }
634  CLOSE_READER(re, &s->gb);
635  }
636 
637  check_scantable_index(s, i);
638 
639  s->block_last_index[n] = i;
640  return 0;
641 }
642 
643 /******************************************/
644 /* decoding */
645 
646 static inline int get_dmv(MpegEncContext *s)
647 {
648  if (get_bits1(&s->gb))
649  return 1 - (get_bits1(&s->gb) << 1);
650  else
651  return 0;
652 }
653 
654 /* motion type (for MPEG-2) */
655 #define MT_FIELD 1
656 #define MT_FRAME 2
657 #define MT_16X8 2
658 #define MT_DMV 3
659 
660 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
661 {
662  int i, j, k, cbp, val, mb_type, motion_type;
663  const int mb_block_count = 4 + (1 << s->chroma_format);
664  int ret;
665 
666  ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
667 
668  av_assert2(s->mb_skipped == 0);
669 
670  if (s->mb_skip_run-- != 0) {
671  if (s->pict_type == AV_PICTURE_TYPE_P) {
672  s->mb_skipped = 1;
673  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
674  MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
675  } else {
676  int mb_type;
677 
678  if (s->mb_x)
679  mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
680  else
681  // FIXME not sure if this is allowed in MPEG at all
682  mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
683  if (IS_INTRA(mb_type)) {
684  av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
685  return AVERROR_INVALIDDATA;
686  }
687  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
688  mb_type | MB_TYPE_SKIP;
689 
690  if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
691  s->mb_skipped = 1;
692  }
693 
694  return 0;
695  }
696 
697  switch (s->pict_type) {
698  default:
699  case AV_PICTURE_TYPE_I:
700  if (get_bits1(&s->gb) == 0) {
701  if (get_bits1(&s->gb) == 0) {
702  av_log(s->avctx, AV_LOG_ERROR,
703  "Invalid mb type in I-frame at %d %d\n",
704  s->mb_x, s->mb_y);
705  return AVERROR_INVALIDDATA;
706  }
707  mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
708  } else {
709  mb_type = MB_TYPE_INTRA;
710  }
711  break;
712  case AV_PICTURE_TYPE_P:
713  mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
714  if (mb_type < 0) {
715  av_log(s->avctx, AV_LOG_ERROR,
716  "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
717  return AVERROR_INVALIDDATA;
718  }
719  mb_type = ptype2mb_type[mb_type];
720  break;
721  case AV_PICTURE_TYPE_B:
722  mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
723  if (mb_type < 0) {
724  av_log(s->avctx, AV_LOG_ERROR,
725  "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
726  return AVERROR_INVALIDDATA;
727  }
728  mb_type = btype2mb_type[mb_type];
729  break;
730  }
731  ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
732 // motion_type = 0; /* avoid warning */
733  if (IS_INTRA(mb_type)) {
734  s->bdsp.clear_blocks(s->block[0]);
735 
736  if (!s->chroma_y_shift)
737  s->bdsp.clear_blocks(s->block[6]);
738 
739  /* compute DCT type */
740  // FIXME: add an interlaced_dct coded var?
741  if (s->picture_structure == PICT_FRAME &&
742  !s->frame_pred_frame_dct)
743  s->interlaced_dct = get_bits1(&s->gb);
744 
745  if (IS_QUANT(mb_type))
746  s->qscale = mpeg_get_qscale(s);
747 
748  if (s->concealment_motion_vectors) {
749  /* just parse them */
750  if (s->picture_structure != PICT_FRAME)
751  skip_bits1(&s->gb); /* field select */
752 
753  s->mv[0][0][0] =
754  s->last_mv[0][0][0] =
755  s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
756  s->last_mv[0][0][0]);
757  s->mv[0][0][1] =
758  s->last_mv[0][0][1] =
759  s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
760  s->last_mv[0][0][1]);
761 
762  check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
763  } else {
764  /* reset mv prediction */
765  memset(s->last_mv, 0, sizeof(s->last_mv));
766  }
767  s->mb_intra = 1;
768 
769  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
770  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
771  for (i = 0; i < 6; i++)
772  mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
773  } else {
774  for (i = 0; i < mb_block_count; i++)
775  if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
776  return ret;
777  }
778  } else {
779  for (i = 0; i < 6; i++) {
780  ret = ff_mpeg1_decode_block_intra(&s->gb,
781  s->intra_matrix,
782  s->intra_scantable.permutated,
783  s->last_dc, *s->pblocks[i],
784  i, s->qscale);
785  if (ret < 0) {
786  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
787  s->mb_x, s->mb_y);
788  return ret;
789  }
790 
791  s->block_last_index[i] = ret;
792  }
793  }
794  } else {
795  if (mb_type & MB_TYPE_ZERO_MV) {
796  av_assert2(mb_type & MB_TYPE_CBP);
797 
798  s->mv_dir = MV_DIR_FORWARD;
799  if (s->picture_structure == PICT_FRAME) {
800  if (s->picture_structure == PICT_FRAME
801  && !s->frame_pred_frame_dct)
802  s->interlaced_dct = get_bits1(&s->gb);
803  s->mv_type = MV_TYPE_16X16;
804  } else {
805  s->mv_type = MV_TYPE_FIELD;
806  mb_type |= MB_TYPE_INTERLACED;
807  s->field_select[0][0] = s->picture_structure - 1;
808  }
809 
810  if (IS_QUANT(mb_type))
811  s->qscale = mpeg_get_qscale(s);
812 
813  s->last_mv[0][0][0] = 0;
814  s->last_mv[0][0][1] = 0;
815  s->last_mv[0][1][0] = 0;
816  s->last_mv[0][1][1] = 0;
817  s->mv[0][0][0] = 0;
818  s->mv[0][0][1] = 0;
819  } else {
820  av_assert2(mb_type & MB_TYPE_L0L1);
821  // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
822  /* get additional motion vector type */
823  if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
824  motion_type = MT_FRAME;
825  } else {
826  motion_type = get_bits(&s->gb, 2);
827  if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
828  s->interlaced_dct = get_bits1(&s->gb);
829  }
830 
831  if (IS_QUANT(mb_type))
832  s->qscale = mpeg_get_qscale(s);
833 
834  /* motion vectors */
835  s->mv_dir = (mb_type >> 13) & 3;
836  ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
837  switch (motion_type) {
838  case MT_FRAME: /* or MT_16X8 */
839  if (s->picture_structure == PICT_FRAME) {
840  mb_type |= MB_TYPE_16x16;
841  s->mv_type = MV_TYPE_16X16;
842  for (i = 0; i < 2; i++) {
843  if (USES_LIST(mb_type, i)) {
844  /* MT_FRAME */
845  s->mv[i][0][0] =
846  s->last_mv[i][0][0] =
847  s->last_mv[i][1][0] =
848  mpeg_decode_motion(s, s->mpeg_f_code[i][0],
849  s->last_mv[i][0][0]);
850  s->mv[i][0][1] =
851  s->last_mv[i][0][1] =
852  s->last_mv[i][1][1] =
853  mpeg_decode_motion(s, s->mpeg_f_code[i][1],
854  s->last_mv[i][0][1]);
855  /* full_pel: only for MPEG-1 */
856  if (s->full_pel[i]) {
857  s->mv[i][0][0] *= 2;
858  s->mv[i][0][1] *= 2;
859  }
860  }
861  }
862  } else {
863  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
864  s->mv_type = MV_TYPE_16X8;
865  for (i = 0; i < 2; i++) {
866  if (USES_LIST(mb_type, i)) {
867  /* MT_16X8 */
868  for (j = 0; j < 2; j++) {
869  s->field_select[i][j] = get_bits1(&s->gb);
870  for (k = 0; k < 2; k++) {
871  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
872  s->last_mv[i][j][k]);
873  s->last_mv[i][j][k] = val;
874  s->mv[i][j][k] = val;
875  }
876  }
877  }
878  }
879  }
880  break;
881  case MT_FIELD:
882  s->mv_type = MV_TYPE_FIELD;
883  if (s->picture_structure == PICT_FRAME) {
884  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
885  for (i = 0; i < 2; i++) {
886  if (USES_LIST(mb_type, i)) {
887  for (j = 0; j < 2; j++) {
888  s->field_select[i][j] = get_bits1(&s->gb);
889  val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
890  s->last_mv[i][j][0]);
891  s->last_mv[i][j][0] = val;
892  s->mv[i][j][0] = val;
893  ff_tlog(s->avctx, "fmx=%d\n", val);
894  val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
895  s->last_mv[i][j][1] >> 1);
896  s->last_mv[i][j][1] = 2 * val;
897  s->mv[i][j][1] = val;
898  ff_tlog(s->avctx, "fmy=%d\n", val);
899  }
900  }
901  }
902  } else {
903  av_assert0(!s->progressive_sequence);
904  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
905  for (i = 0; i < 2; i++) {
906  if (USES_LIST(mb_type, i)) {
907  s->field_select[i][0] = get_bits1(&s->gb);
908  for (k = 0; k < 2; k++) {
909  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
910  s->last_mv[i][0][k]);
911  s->last_mv[i][0][k] = val;
912  s->last_mv[i][1][k] = val;
913  s->mv[i][0][k] = val;
914  }
915  }
916  }
917  }
918  break;
919  case MT_DMV:
920  if (s->progressive_sequence){
921  av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
922  return AVERROR_INVALIDDATA;
923  }
924  s->mv_type = MV_TYPE_DMV;
925  for (i = 0; i < 2; i++) {
926  if (USES_LIST(mb_type, i)) {
927  int dmx, dmy, mx, my, m;
928  const int my_shift = s->picture_structure == PICT_FRAME;
929 
930  mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
931  s->last_mv[i][0][0]);
932  s->last_mv[i][0][0] = mx;
933  s->last_mv[i][1][0] = mx;
934  dmx = get_dmv(s);
935  my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
936  s->last_mv[i][0][1] >> my_shift);
937  dmy = get_dmv(s);
938 
939 
940  s->last_mv[i][0][1] = my * (1 << my_shift);
941  s->last_mv[i][1][1] = my * (1 << my_shift);
942 
943  s->mv[i][0][0] = mx;
944  s->mv[i][0][1] = my;
945  s->mv[i][1][0] = mx; // not used
946  s->mv[i][1][1] = my; // not used
947 
948  if (s->picture_structure == PICT_FRAME) {
949  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
950 
951  // m = 1 + 2 * s->top_field_first;
952  m = s->top_field_first ? 1 : 3;
953 
954  /* top -> top pred */
955  s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
956  s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
957  m = 4 - m;
958  s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
959  s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
960  } else {
961  mb_type |= MB_TYPE_16x16;
962 
963  s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
964  s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
965  if (s->picture_structure == PICT_TOP_FIELD)
966  s->mv[i][2][1]--;
967  else
968  s->mv[i][2][1]++;
969  }
970  }
971  }
972  break;
973  default:
974  av_log(s->avctx, AV_LOG_ERROR,
975  "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
976  return AVERROR_INVALIDDATA;
977  }
978  }
979 
980  s->mb_intra = 0;
981  if (HAS_CBP(mb_type)) {
982  s->bdsp.clear_blocks(s->block[0]);
983 
984  cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
985  if (mb_block_count > 6) {
986  cbp *= 1 << mb_block_count - 6;
987  cbp |= get_bits(&s->gb, mb_block_count - 6);
988  s->bdsp.clear_blocks(s->block[6]);
989  }
990  if (cbp <= 0) {
991  av_log(s->avctx, AV_LOG_ERROR,
992  "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
993  return AVERROR_INVALIDDATA;
994  }
995 
996  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
997  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
998  for (i = 0; i < 6; i++) {
999  if (cbp & 32)
1000  mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1001  else
1002  s->block_last_index[i] = -1;
1003  cbp += cbp;
1004  }
1005  } else {
1006  cbp <<= 12 - mb_block_count;
1007 
1008  for (i = 0; i < mb_block_count; i++) {
1009  if (cbp & (1 << 11)) {
1010  if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1011  return ret;
1012  } else {
1013  s->block_last_index[i] = -1;
1014  }
1015  cbp += cbp;
1016  }
1017  }
1018  } else {
1019  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1020  for (i = 0; i < 6; i++) {
1021  if (cbp & 32)
1022  mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1023  else
1024  s->block_last_index[i] = -1;
1025  cbp += cbp;
1026  }
1027  } else {
1028  for (i = 0; i < 6; i++) {
1029  if (cbp & 32) {
1030  if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1031  return ret;
1032  } else {
1033  s->block_last_index[i] = -1;
1034  }
1035  cbp += cbp;
1036  }
1037  }
1038  }
1039  } else {
1040  for (i = 0; i < 12; i++)
1041  s->block_last_index[i] = -1;
1042  }
1043  }
1044 
1045  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1046 
1047  return 0;
1048 }
1049 
1050 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1051 {
1052  Mpeg1Context *s = avctx->priv_data;
1053  MpegEncContext *s2 = &s->mpeg_enc_ctx;
1054 
1055  if ( avctx->codec_tag != AV_RL32("VCR2")
1056  && avctx->codec_tag != AV_RL32("BW10"))
1057  avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1058  ff_mpv_decode_init(s2, avctx);
1059 
1060  ff_mpeg12_init_vlcs();
1061 
1062  s2->chroma_format = 1;
1063  s->mpeg_enc_ctx_allocated = 0;
1064  s->repeat_field = 0;
1065  avctx->color_range = AVCOL_RANGE_MPEG;
1066  return 0;
1067 }
1068 
1069 #if HAVE_THREADS
1070 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1071  const AVCodecContext *avctx_from)
1072 {
1073  Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1074  MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1075  int err;
1076 
1077  if (avctx == avctx_from ||
1078  !ctx_from->mpeg_enc_ctx_allocated ||
1079  !s1->context_initialized)
1080  return 0;
1081 
1082  err = ff_mpeg_update_thread_context(avctx, avctx_from);
1083  if (err)
1084  return err;
1085 
1086  if (!ctx->mpeg_enc_ctx_allocated)
1087  memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1088 
1089  return 0;
1090 }
1091 #endif
1092 
1093 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1094 #if CONFIG_MPEG1_NVDEC_HWACCEL
1095  AV_PIX_FMT_CUDA,
1096 #endif
1097 #if CONFIG_MPEG1_VDPAU_HWACCEL
1098  AV_PIX_FMT_VDPAU,
1099 #endif
1100  AV_PIX_FMT_YUV420P,
1101  AV_PIX_FMT_NONE
1102 };
1103 
1104 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1105 #if CONFIG_MPEG2_NVDEC_HWACCEL
1106  AV_PIX_FMT_CUDA,
1107 #endif
1108 #if CONFIG_MPEG2_VDPAU_HWACCEL
1109  AV_PIX_FMT_VDPAU,
1110 #endif
1111 #if CONFIG_MPEG2_DXVA2_HWACCEL
1112  AV_PIX_FMT_DXVA2_VLD,
1113 #endif
1114 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1115  AV_PIX_FMT_D3D11VA_VLD,
1116  AV_PIX_FMT_D3D11,
1117 #endif
1118 #if CONFIG_MPEG2_VAAPI_HWACCEL
1119  AV_PIX_FMT_VAAPI,
1120 #endif
1121 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1122  AV_PIX_FMT_VIDEOTOOLBOX,
1123 #endif
1124  AV_PIX_FMT_YUV420P,
1125  AV_PIX_FMT_NONE
1126 };
1127 
1128 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1129  AV_PIX_FMT_YUV422P,
1130  AV_PIX_FMT_NONE
1131 };
1132 
1133 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1134  AV_PIX_FMT_YUV444P,
1135  AV_PIX_FMT_NONE
1136 };
1137 
1138 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1139 {
1140  Mpeg1Context *s1 = avctx->priv_data;
1141  MpegEncContext *s = &s1->mpeg_enc_ctx;
1142  const enum AVPixelFormat *pix_fmts;
1143 
1144  if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1145  return AV_PIX_FMT_GRAY8;
1146 
1147  if (s->chroma_format < 2)
1148  pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1149  mpeg1_hwaccel_pixfmt_list_420 :
1150  mpeg2_hwaccel_pixfmt_list_420;
1151  else if (s->chroma_format == 2)
1152  pix_fmts = mpeg12_pixfmt_list_422;
1153  else
1154  pix_fmts = mpeg12_pixfmt_list_444;
1155 
1156  return ff_get_format(avctx, pix_fmts);
1157 }
1158 
1159 /* Call this function when we know all parameters.
1160  * It may be called in different places for MPEG-1 and MPEG-2. */
1161 static int mpeg_decode_postinit(AVCodecContext *avctx)
1162 {
1163  Mpeg1Context *s1 = avctx->priv_data;
1164  MpegEncContext *s = &s1->mpeg_enc_ctx;
1165  int ret;
1166 
1167  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1168  // MPEG-1 aspect
1169  AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s1->aspect_ratio_info], 255);
1170  avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1171  } else { // MPEG-2
1172  // MPEG-2 aspect
1173  if (s1->aspect_ratio_info > 1) {
1174  AVRational dar =
1175  av_mul_q(av_div_q(ff_mpeg2_aspect[s1->aspect_ratio_info],
1176  (AVRational) { s1->pan_scan.width,
1177  s1->pan_scan.height }),
1178  (AVRational) { s->width, s->height });
1179 
1180  /* We ignore the spec here and guess a bit as reality does not
1181  * match the spec, see for example res_change_ffmpeg_aspect.ts
1182  * and sequence-display-aspect.mpg.
1183  * issue1613, 621, 562 */
1184  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1185  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1186  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1187  s->avctx->sample_aspect_ratio =
1188  av_div_q(ff_mpeg2_aspect[s1->aspect_ratio_info],
1189  (AVRational) { s->width, s->height });
1190  } else {
1191  s->avctx->sample_aspect_ratio =
1192  av_div_q(ff_mpeg2_aspect[s1->aspect_ratio_info],
1193  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1194 // issue1613 4/3 16/9 -> 16/9
1195 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1196 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1197 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1198  ff_dlog(avctx, "aspect A %d/%d\n",
1199  ff_mpeg2_aspect[s1->aspect_ratio_info].num,
1200  ff_mpeg2_aspect[s1->aspect_ratio_info].den);
1201  ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1202  s->avctx->sample_aspect_ratio.den);
1203  }
1204  } else {
1205  s->avctx->sample_aspect_ratio =
1206  ff_mpeg2_aspect[s1->aspect_ratio_info];
1207  }
1208  } // MPEG-2
1209 
1210  if (av_image_check_sar(s->width, s->height,
1211  avctx->sample_aspect_ratio) < 0) {
1212  av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1213  avctx->sample_aspect_ratio.num,
1214  avctx->sample_aspect_ratio.den);
1215  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1216  }
1217 
1218  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1219  avctx->coded_width != s->width ||
1220  avctx->coded_height != s->height ||
1221  s1->save_width != s->width ||
1222  s1->save_height != s->height ||
1223  av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1224  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1225  0) {
1226  if (s1->mpeg_enc_ctx_allocated) {
1227  ff_mpv_common_end(s);
1228  s1->mpeg_enc_ctx_allocated = 0;
1229  }
1230 
1231  ret = ff_set_dimensions(avctx, s->width, s->height);
1232  if (ret < 0)
1233  return ret;
1234 
1235  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate &&
1236  (s->bit_rate != 0x3FFFF*400)) {
1237  avctx->rc_max_rate = s->bit_rate;
1238  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1239  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1240  avctx->bit_rate = s->bit_rate;
1241  }
1242  s1->save_aspect = s->avctx->sample_aspect_ratio;
1243  s1->save_width = s->width;
1244  s1->save_height = s->height;
1245  s1->save_progressive_seq = s->progressive_sequence;
1246 
1247  /* low_delay may be forced, in this case we will have B-frames
1248  * that behave like P-frames. */
1249  avctx->has_b_frames = !s->low_delay;
1250 
1251  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1252  // MPEG-1 fps
1253  avctx->framerate = ff_mpeg12_frame_rate_tab[s1->frame_rate_index];
1254 #if FF_API_TICKS_PER_FRAME
1255 FF_DISABLE_DEPRECATION_WARNINGS
1256  avctx->ticks_per_frame = 1;
1257 FF_ENABLE_DEPRECATION_WARNINGS
1258 #endif
1259 
1260  avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1261  } else { // MPEG-2
1262  // MPEG-2 fps
1263  av_reduce(&s->avctx->framerate.num,
1264  &s->avctx->framerate.den,
1265  ff_mpeg12_frame_rate_tab[s1->frame_rate_index].num * s1->frame_rate_ext.num,
1266  ff_mpeg12_frame_rate_tab[s1->frame_rate_index].den * s1->frame_rate_ext.den,
1267  1 << 30);
1268 #if FF_API_TICKS_PER_FRAME
1269 FF_DISABLE_DEPRECATION_WARNINGS
1270  avctx->ticks_per_frame = 2;
1271 FF_ENABLE_DEPRECATION_WARNINGS
1272 #endif
1273 
1274  switch (s->chroma_format) {
1275  case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1276  case 2:
1277  case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1278  default: av_assert0(0);
1279  }
1280  } // MPEG-2
1281 
1282  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1283 
1284  if ((ret = ff_mpv_common_init(s)) < 0)
1285  return ret;
1286 
1287  s1->mpeg_enc_ctx_allocated = 1;
1288  }
1289  return 0;
1290 }
1291 
1292 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1293  int buf_size)
1294 {
1295  Mpeg1Context *s1 = avctx->priv_data;
1296  MpegEncContext *s = &s1->mpeg_enc_ctx;
1297  int ref, f_code, vbv_delay, ret;
1298 
1299  ret = init_get_bits8(&s->gb, buf, buf_size);
1300  if (ret < 0)
1301  return ret;
1302 
1303  ref = get_bits(&s->gb, 10); /* temporal ref */
1304  s->pict_type = get_bits(&s->gb, 3);
1305  if (s->pict_type == 0 || s->pict_type > 3)
1306  return AVERROR_INVALIDDATA;
1307 
1308  vbv_delay = get_bits(&s->gb, 16);
1309  s->vbv_delay = vbv_delay;
1310  if (s->pict_type == AV_PICTURE_TYPE_P ||
1311  s->pict_type == AV_PICTURE_TYPE_B) {
1312  s->full_pel[0] = get_bits1(&s->gb);
1313  f_code = get_bits(&s->gb, 3);
1314  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1315  return AVERROR_INVALIDDATA;
1316  f_code += !f_code;
1317  s->mpeg_f_code[0][0] = f_code;
1318  s->mpeg_f_code[0][1] = f_code;
1319  }
1320  if (s->pict_type == AV_PICTURE_TYPE_B) {
1321  s->full_pel[1] = get_bits1(&s->gb);
1322  f_code = get_bits(&s->gb, 3);
1323  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1324  return AVERROR_INVALIDDATA;
1325  f_code += !f_code;
1326  s->mpeg_f_code[1][0] = f_code;
1327  s->mpeg_f_code[1][1] = f_code;
1328  }
1329 
1330  if (avctx->debug & FF_DEBUG_PICT_INFO)
1331  av_log(avctx, AV_LOG_DEBUG,
1332  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1333 
1334  s->y_dc_scale = 8;
1335  s->c_dc_scale = 8;
1336  return 0;
1337 }
1338 
1339 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1340 {
1341  MpegEncContext *s = &s1->mpeg_enc_ctx;
1342  int horiz_size_ext, vert_size_ext;
1343  int bit_rate_ext;
1344 
1345  skip_bits(&s->gb, 1); /* profile and level esc*/
1346  s->avctx->profile = get_bits(&s->gb, 3);
1347  s->avctx->level = get_bits(&s->gb, 4);
1348  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1349  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1350 
1351  if (!s->chroma_format) {
1352  s->chroma_format = 1;
1353  av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1354  }
1355 
1356  horiz_size_ext = get_bits(&s->gb, 2);
1357  vert_size_ext = get_bits(&s->gb, 2);
1358  s->width |= (horiz_size_ext << 12);
1359  s->height |= (vert_size_ext << 12);
1360  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1361  s->bit_rate += (bit_rate_ext << 18) * 400LL;
1362  check_marker(s->avctx, &s->gb, "after bit rate extension");
1363  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1364 
1365  s->low_delay = get_bits1(&s->gb);
1366  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1367  s->low_delay = 1;
1368 
1369  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1370  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1371 
1372  ff_dlog(s->avctx, "sequence extension\n");
1373  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1374 
1375  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1376  av_log(s->avctx, AV_LOG_DEBUG,
1377  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1378  s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1379  s->avctx->rc_buffer_size, s->bit_rate);
1380 }
1381 
1382 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1383 {
1384  MpegEncContext *s = &s1->mpeg_enc_ctx;
1385  int color_description, w, h;
1386 
1387  skip_bits(&s->gb, 3); /* video format */
1388  color_description = get_bits1(&s->gb);
1389  if (color_description) {
1390  s->avctx->color_primaries = get_bits(&s->gb, 8);
1391  s->avctx->color_trc = get_bits(&s->gb, 8);
1392  s->avctx->colorspace = get_bits(&s->gb, 8);
1393  }
1394  w = get_bits(&s->gb, 14);
1395  skip_bits(&s->gb, 1); // marker
1396  h = get_bits(&s->gb, 14);
1397  // remaining 3 bits are zero padding
1398 
1399  s1->pan_scan.width = 16 * w;
1400  s1->pan_scan.height = 16 * h;
1401 
1402  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1403  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1404 }
1405 
1406 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1407 {
1408  MpegEncContext *s = &s1->mpeg_enc_ctx;
1409  int i, nofco;
1410 
1411  nofco = 1;
1412  if (s->progressive_sequence) {
1413  if (s->repeat_first_field) {
1414  nofco++;
1415  if (s->top_field_first)
1416  nofco++;
1417  }
1418  } else {
1419  if (s->picture_structure == PICT_FRAME) {
1420  nofco++;
1421  if (s->repeat_first_field)
1422  nofco++;
1423  }
1424  }
1425  for (i = 0; i < nofco; i++) {
1426  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1427  skip_bits(&s->gb, 1); // marker
1428  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1429  skip_bits(&s->gb, 1); // marker
1430  }
1431 
1432  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1433  av_log(s->avctx, AV_LOG_DEBUG,
1434  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1435  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1436  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1437  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1438 }
1439 
1440 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1441  uint16_t matrix1[64], int intra)
1442 {
1443  int i;
1444 
1445  for (i = 0; i < 64; i++) {
1446  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1447  int v = get_bits(&s->gb, 8);
1448  if (v == 0) {
1449  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1450  return AVERROR_INVALIDDATA;
1451  }
1452  if (intra && i == 0 && v != 8) {
1453  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1454  v = 8; // needed by pink.mpg / issue1046
1455  }
1456  matrix0[j] = v;
1457  if (matrix1)
1458  matrix1[j] = v;
1459  }
1460  return 0;
1461 }
1462 
1463 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1464 {
1465  ff_dlog(s->avctx, "matrix extension\n");
1466 
1467  if (get_bits1(&s->gb))
1468  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1469  if (get_bits1(&s->gb))
1470  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1471  if (get_bits1(&s->gb))
1472  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1473  if (get_bits1(&s->gb))
1474  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1475 }
1476 
1477 static int mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1478 {
1479  MpegEncContext *s = &s1->mpeg_enc_ctx;
1480 
1481  s->full_pel[0] = s->full_pel[1] = 0;
1482  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1483  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1484  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1485  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1486  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1487  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1488  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1489  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1490  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1491  av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code\n");
1492  if (s->avctx->err_recognition & AV_EF_EXPLODE)
1493  return AVERROR_INVALIDDATA;
1494  av_log(s->avctx, AV_LOG_WARNING, "Guessing pict_type from mpeg_f_code\n");
1495  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1496  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1497  s->pict_type = AV_PICTURE_TYPE_I;
1498  else
1499  s->pict_type = AV_PICTURE_TYPE_P;
1500  } else
1501  s->pict_type = AV_PICTURE_TYPE_B;
1502  }
1503 
1504  s->intra_dc_precision = get_bits(&s->gb, 2);
1505  s->picture_structure = get_bits(&s->gb, 2);
1506  s->top_field_first = get_bits1(&s->gb);
1507  s->frame_pred_frame_dct = get_bits1(&s->gb);
1508  s->concealment_motion_vectors = get_bits1(&s->gb);
1509  s->q_scale_type = get_bits1(&s->gb);
1510  s->intra_vlc_format = get_bits1(&s->gb);
1511  s->alternate_scan = get_bits1(&s->gb);
1512  s->repeat_first_field = get_bits1(&s->gb);
1513  s->chroma_420_type = get_bits1(&s->gb);
1514  s->progressive_frame = get_bits1(&s->gb);
1515 
1516  if (s->alternate_scan) {
1517  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1518  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1519  } else {
1520  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1521  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1522  }
1523 
1524  /* composite display not parsed */
1525  ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1526  ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1527  ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1528  ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1529  ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1530  ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1531  ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1532  ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1533  ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1534 
1535  return 0;
1536 }
1537 
1538 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1539 {
1540  AVCodecContext *avctx = s->avctx;
1541  Mpeg1Context *s1 = (Mpeg1Context *) s;
1542  int ret;
1543 
1544  if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1545  if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1546  return AVERROR_INVALIDDATA;
1547  }
1548 
1549  /* start frame decoding */
1550  if (s->first_field || s->picture_structure == PICT_FRAME) {
1551  AVFrameSideData *pan_scan;
1552 
1553  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1554  return ret;
1555 
1556  ff_mpeg_er_frame_start(s);
1557 
1558  /* first check if we must repeat the frame */
1559  s->current_picture_ptr->f->repeat_pict = 0;
1560  if (s->repeat_first_field) {
1561  if (s->progressive_sequence) {
1562  if (s->top_field_first)
1563  s->current_picture_ptr->f->repeat_pict = 4;
1564  else
1565  s->current_picture_ptr->f->repeat_pict = 2;
1566  } else if (s->progressive_frame) {
1567  s->current_picture_ptr->f->repeat_pict = 1;
1568  }
1569  }
1570 
1571  pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1572  AV_FRAME_DATA_PANSCAN,
1573  sizeof(s1->pan_scan));
1574  if (!pan_scan)
1575  return AVERROR(ENOMEM);
1576  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1577 
1578  if (s1->a53_buf_ref) {
1579  AVFrameSideData *sd = av_frame_new_side_data_from_buf(
1580  s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1581  s1->a53_buf_ref);
1582  if (!sd)
1583  av_buffer_unref(&s1->a53_buf_ref);
1584  s1->a53_buf_ref = NULL;
1585  }
1586 
1587  if (s1->has_stereo3d) {
1588  AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1589  if (!stereo)
1590  return AVERROR(ENOMEM);
1591 
1592  *stereo = s1->stereo3d;
1593  s1->has_stereo3d = 0;
1594  }
1595 
1596  if (s1->has_afd) {
1597  AVFrameSideData *sd =
1598  av_frame_new_side_data(s->current_picture_ptr->f,
1599  AV_FRAME_DATA_AFD, 1);
1600  if (!sd)
1601  return AVERROR(ENOMEM);
1602 
1603  *sd->data = s1->afd;
1604  s1->has_afd = 0;
1605  }
1606 
1607  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1608  ff_thread_finish_setup(avctx);
1609  } else { // second field
1610  int i;
1611 
1612  if (!s->current_picture_ptr) {
1613  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1614  return AVERROR_INVALIDDATA;
1615  }
1616 
1617  if (s->avctx->hwaccel) {
1618  if ((ret = FF_HW_SIMPLE_CALL(s->avctx, end_frame)) < 0) {
1619  av_log(avctx, AV_LOG_ERROR,
1620  "hardware accelerator failed to decode first field\n");
1621  return ret;
1622  }
1623  }
1624 
1625  for (i = 0; i < 4; i++) {
1626  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1627  if (s->picture_structure == PICT_BOTTOM_FIELD)
1628  s->current_picture.f->data[i] +=
1629  s->current_picture_ptr->f->linesize[i];
1630  }
1631  }
1632 
1633  if (avctx->hwaccel) {
1634  if ((ret = FF_HW_CALL(avctx, start_frame, buf, buf_size)) < 0)
1635  return ret;
1636  }
1637 
1638  return 0;
1639 }
1640 
1641 #define DECODE_SLICE_ERROR -1
1642 #define DECODE_SLICE_OK 0
1643 
1644 /**
1645  * Decode a slice.
1646  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1647  * @return DECODE_SLICE_ERROR if the slice is damaged,
1648  * DECODE_SLICE_OK if this slice is OK
1649  */
1650 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1651  const uint8_t **buf, int buf_size)
1652 {
1653  AVCodecContext *avctx = s->avctx;
1654  const int lowres = s->avctx->lowres;
1655  const int field_pic = s->picture_structure != PICT_FRAME;
1656  int ret;
1657 
1658  s->resync_mb_x =
1659  s->resync_mb_y = -1;
1660 
1661  av_assert0(mb_y < s->mb_height);
1662 
1663  ret = init_get_bits8(&s->gb, *buf, buf_size);
1664  if (ret < 0)
1665  return ret;
1666 
1667  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1668  skip_bits(&s->gb, 3);
1669 
1670  ff_mpeg1_clean_buffers(s);
1671  s->interlaced_dct = 0;
1672 
1673  s->qscale = mpeg_get_qscale(s);
1674 
1675  if (s->qscale == 0) {
1676  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1677  return AVERROR_INVALIDDATA;
1678  }
1679 
1680  /* extra slice info */
1681  if (skip_1stop_8data_bits(&s->gb) < 0)
1682  return AVERROR_INVALIDDATA;
1683 
1684  s->mb_x = 0;
1685 
1686  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1687  skip_bits1(&s->gb);
1688  } else {
1689  while (get_bits_left(&s->gb) > 0) {
1690  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1691  MBINCR_VLC_BITS, 2);
1692  if (code < 0) {
1693  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1694  return AVERROR_INVALIDDATA;
1695  }
1696  if (code >= 33) {
1697  if (code == 33)
1698  s->mb_x += 33;
1699  /* otherwise, stuffing, nothing to do */
1700  } else {
1701  s->mb_x += code;
1702  break;
1703  }
1704  }
1705  }
1706 
1707  if (s->mb_x >= (unsigned) s->mb_width) {
1708  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1709  return AVERROR_INVALIDDATA;
1710  }
1711 
1712  if (avctx->hwaccel) {
1713  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1714  int start_code = -1;
1715  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1716  if (buf_end < *buf + buf_size)
1717  buf_end -= 4;
1718  s->mb_y = mb_y;
1719  if (FF_HW_CALL(avctx, decode_slice, buf_start, buf_end - buf_start) < 0)
1720  return DECODE_SLICE_ERROR;
1721  *buf = buf_end;
1722  return DECODE_SLICE_OK;
1723  }
1724 
1725  s->resync_mb_x = s->mb_x;
1726  s->resync_mb_y = s->mb_y = mb_y;
1727  s->mb_skip_run = 0;
1728  ff_init_block_index(s);
1729 
1730  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1731  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1732  av_log(s->avctx, AV_LOG_DEBUG,
1733  "qp:%d fc:%2d%2d%2d%2d %c %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1734  s->qscale,
1735  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1736  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1737  s->pict_type == AV_PICTURE_TYPE_I ? 'I' :
1738  (s->pict_type == AV_PICTURE_TYPE_P ? 'P' :
1739  (s->pict_type == AV_PICTURE_TYPE_B ? 'B' : 'S')),
1740  s->progressive_sequence ? "ps" : "",
1741  s->progressive_frame ? "pf" : "",
1742  s->alternate_scan ? "alt" : "",
1743  s->top_field_first ? "top" : "",
1744  s->intra_dc_precision, s->picture_structure,
1745  s->frame_pred_frame_dct, s->concealment_motion_vectors,
1746  s->q_scale_type, s->intra_vlc_format,
1747  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1748  }
1749  }
1750 
1751  for (;;) {
1752  if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1753  return ret;
1754 
1755  // Note motion_val is normally NULL unless we want to extract the MVs.
1756  if (s->current_picture.motion_val[0]) {
1757  const int wrap = s->b8_stride;
1758  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1759  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1760  int motion_x, motion_y, dir, i;
1761 
1762  for (i = 0; i < 2; i++) {
1763  for (dir = 0; dir < 2; dir++) {
1764  if (s->mb_intra ||
1765  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1766  motion_x = motion_y = 0;
1767  } else if (s->mv_type == MV_TYPE_16X16 ||
1768  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1769  motion_x = s->mv[dir][0][0];
1770  motion_y = s->mv[dir][0][1];
1771  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1772  motion_x = s->mv[dir][i][0];
1773  motion_y = s->mv[dir][i][1];
1774  }
1775 
1776  s->current_picture.motion_val[dir][xy][0] = motion_x;
1777  s->current_picture.motion_val[dir][xy][1] = motion_y;
1778  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1779  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1780  s->current_picture.ref_index [dir][b8_xy] =
1781  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1782  av_assert2(s->field_select[dir][i] == 0 ||
1783  s->field_select[dir][i] == 1);
1784  }
1785  xy += wrap;
1786  b8_xy += 2;
1787  }
1788  }
1789 
1790  s->dest[0] += 16 >> lowres;
1791  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1792  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1793 
1794  ff_mpv_reconstruct_mb(s, s->block);
1795 
1796  if (++s->mb_x >= s->mb_width) {
1797  const int mb_size = 16 >> s->avctx->lowres;
1798  int left;
1799 
1800  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1801  ff_mpv_report_decode_progress(s);
1802 
1803  s->mb_x = 0;
1804  s->mb_y += 1 << field_pic;
1805 
1806  if (s->mb_y >= s->mb_height) {
1807  int left = get_bits_left(&s->gb);
1808  int is_d10 = s->chroma_format == 2 &&
1809  s->pict_type == AV_PICTURE_TYPE_I &&
1810  avctx->profile == 0 && avctx->level == 5 &&
1811  s->intra_dc_precision == 2 &&
1812  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1813  s->progressive_frame == 0
1814  /* vbv_delay == 0xBBB || 0xE10 */;
1815 
1816  if (left >= 32 && !is_d10) {
1817  GetBitContext gb = s->gb;
1818  align_get_bits(&gb);
1819  if (show_bits(&gb, 24) == 0x060E2B) {
1820  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1821  is_d10 = 1;
1822  }
1823  if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1824  av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1825  goto eos;
1826  }
1827  }
1828 
1829  if (left < 0 ||
1830  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1831  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1832  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1833  left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1834  return AVERROR_INVALIDDATA;
1835  } else
1836  goto eos;
1837  }
1838  // There are some files out there which are missing the last slice
1839  // in cases where the slice is completely outside the visible
1840  // area, we detect this here instead of running into the end expecting
1841  // more data
1842  left = get_bits_left(&s->gb);
1843  if (s->mb_y >= ((s->height + 15) >> 4) &&
1844  !s->progressive_sequence &&
1845  left <= 25 &&
1846  left >= 0 &&
1847  s->mb_skip_run == -1 &&
1848  (!left || show_bits(&s->gb, left) == 0))
1849  goto eos;
1850 
1851  ff_init_block_index(s);
1852  }
1853 
1854  /* skip mb handling */
1855  if (s->mb_skip_run == -1) {
1856  /* read increment again */
1857  s->mb_skip_run = 0;
1858  for (;;) {
1859  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1860  MBINCR_VLC_BITS, 2);
1861  if (code < 0) {
1862  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1863  return AVERROR_INVALIDDATA;
1864  }
1865  if (code >= 33) {
1866  if (code == 33) {
1867  s->mb_skip_run += 33;
1868  } else if (code == 35) {
1869  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1870  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1871  return AVERROR_INVALIDDATA;
1872  }
1873  goto eos; /* end of slice */
1874  }
1875  /* otherwise, stuffing, nothing to do */
1876  } else {
1877  s->mb_skip_run += code;
1878  break;
1879  }
1880  }
1881  if (s->mb_skip_run) {
1882  int i;
1883  if (s->pict_type == AV_PICTURE_TYPE_I) {
1884  av_log(s->avctx, AV_LOG_ERROR,
1885  "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1886  return AVERROR_INVALIDDATA;
1887  }
1888 
1889  /* skip mb */
1890  s->mb_intra = 0;
1891  for (i = 0; i < 12; i++)
1892  s->block_last_index[i] = -1;
1893  if (s->picture_structure == PICT_FRAME)
1894  s->mv_type = MV_TYPE_16X16;
1895  else
1896  s->mv_type = MV_TYPE_FIELD;
1897  if (s->pict_type == AV_PICTURE_TYPE_P) {
1898  /* if P type, zero motion vector is implied */
1899  s->mv_dir = MV_DIR_FORWARD;
1900  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1901  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1902  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1903  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1904  } else {
1905  /* if B type, reuse previous vectors and directions */
1906  s->mv[0][0][0] = s->last_mv[0][0][0];
1907  s->mv[0][0][1] = s->last_mv[0][0][1];
1908  s->mv[1][0][0] = s->last_mv[1][0][0];
1909  s->mv[1][0][1] = s->last_mv[1][0][1];
1910  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1911  s->field_select[1][0] = (s->picture_structure - 1) & 1;
1912  }
1913  }
1914  }
1915  }
1916 eos: // end of slice
1917  if (get_bits_left(&s->gb) < 0) {
1918  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1919  return AVERROR_INVALIDDATA;
1920  }
1921  *buf += (get_bits_count(&s->gb) - 1) / 8;
1922  ff_dlog(s, "Slice start:%d %d end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1923  return 0;
1924 }
1925 
1926 static int slice_decode_thread(AVCodecContext *c, void *arg)
1927 {
1928  MpegEncContext *s = *(void **) arg;
1929  const uint8_t *buf = s->gb.buffer;
1930  int mb_y = s->start_mb_y;
1931  const int field_pic = s->picture_structure != PICT_FRAME;
1932 
1933  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1934 
1935  for (;;) {
1936  uint32_t start_code;
1937  int ret;
1938 
1939  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1940  emms_c();
1941  ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1942  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1943  s->start_mb_y, s->end_mb_y, s->er.error_count);
1944  if (ret < 0) {
1945  if (c->err_recognition & AV_EF_EXPLODE)
1946  return ret;
1947  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1948  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1949  s->mb_x, s->mb_y,
1950  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1951  } else {
1952  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1953  s->mb_x - 1, s->mb_y,
1954  ER_AC_END | ER_DC_END | ER_MV_END);
1955  }
1956 
1957  if (s->mb_y == s->end_mb_y)
1958  return 0;
1959 
1960  start_code = -1;
1961  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1962  if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
1963  return AVERROR_INVALIDDATA;
1964  mb_y = start_code - SLICE_MIN_START_CODE;
1965  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1966  mb_y += (*buf&0xE0)<<2;
1967  mb_y <<= field_pic;
1968  if (s->picture_structure == PICT_BOTTOM_FIELD)
1969  mb_y++;
1970  if (mb_y >= s->end_mb_y)
1971  return AVERROR_INVALIDDATA;
1972  }
1973 }
1974 
1975 /**
1976  * Handle slice ends.
1977  * @return 1 if it seems to be the last slice
1978  */
1979 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1980 {
1981  Mpeg1Context *s1 = avctx->priv_data;
1982  MpegEncContext *s = &s1->mpeg_enc_ctx;
1983 
1984  if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1985  return 0;
1986 
1987  if (s->avctx->hwaccel) {
1988  int ret = FF_HW_SIMPLE_CALL(s->avctx, end_frame);
1989  if (ret < 0) {
1990  av_log(avctx, AV_LOG_ERROR,
1991  "hardware accelerator failed to decode picture\n");
1992  return ret;
1993  }
1994  }
1995 
1996  /* end of slice reached */
1997  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
1998  /* end of image */
1999 
2000  ff_er_frame_end(&s->er, NULL);
2001 
2002  ff_mpv_frame_end(s);
2003 
2004  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2005  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2006  if (ret < 0)
2007  return ret;
2008  ff_print_debug_info(s, s->current_picture_ptr, pict);
2009  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG2);
2010  } else {
2011  /* latency of 1 frame for I- and P-frames */
2012  if (s->last_picture_ptr) {
2013  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2014  if (ret < 0)
2015  return ret;
2016  ff_print_debug_info(s, s->last_picture_ptr, pict);
2017  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG2);
2018  }
2019  }
2020 
2021  return 1;
2022  } else {
2023  return 0;
2024  }
2025 }
2026 
2027 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2028  const uint8_t *buf, int buf_size)
2029 {
2030  Mpeg1Context *s1 = avctx->priv_data;
2031  MpegEncContext *s = &s1->mpeg_enc_ctx;
2032  int width, height;
2033  int i, v, j;
2034 
2035  int ret = init_get_bits8(&s->gb, buf, buf_size);
2036  if (ret < 0)
2037  return ret;
2038 
2039  width = get_bits(&s->gb, 12);
2040  height = get_bits(&s->gb, 12);
2041  if (width == 0 || height == 0) {
2042  av_log(avctx, AV_LOG_WARNING,
2043  "Invalid horizontal or vertical size value.\n");
2044  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2045  return AVERROR_INVALIDDATA;
2046  }
2047  s1->aspect_ratio_info = get_bits(&s->gb, 4);
2048  if (s1->aspect_ratio_info == 0) {
2049  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2050  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2051  return AVERROR_INVALIDDATA;
2052  }
2053  s1->frame_rate_index = get_bits(&s->gb, 4);
2054  if (s1->frame_rate_index == 0 || s1->frame_rate_index > 13) {
2055  av_log(avctx, AV_LOG_WARNING,
2056  "frame_rate_index %d is invalid\n", s1->frame_rate_index);
2057  s1->frame_rate_index = 1;
2058  }
2059  s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2060  if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2061  return AVERROR_INVALIDDATA;
2062  }
2063 
2064  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2065  skip_bits(&s->gb, 1);
2066 
2067  /* get matrix */
2068  if (get_bits1(&s->gb)) {
2069  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2070  } else {
2071  for (i = 0; i < 64; i++) {
2072  j = s->idsp.idct_permutation[i];
2073  v = ff_mpeg1_default_intra_matrix[i];
2074  s->intra_matrix[j] = v;
2075  s->chroma_intra_matrix[j] = v;
2076  }
2077  }
2078  if (get_bits1(&s->gb)) {
2079  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2080  } else {
2081  for (i = 0; i < 64; i++) {
2082  int j = s->idsp.idct_permutation[i];
2083  v = ff_mpeg1_default_non_intra_matrix[i];
2084  s->inter_matrix[j] = v;
2085  s->chroma_inter_matrix[j] = v;
2086  }
2087  }
2088 
2089  if (show_bits(&s->gb, 23) != 0) {
2090  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2091  return AVERROR_INVALIDDATA;
2092  }
2093 
2094  s->width = width;
2095  s->height = height;
2096 
2097  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2098  s->progressive_sequence = 1;
2099  s->progressive_frame = 1;
2100  s->picture_structure = PICT_FRAME;
2101  s->first_field = 0;
2102  s->frame_pred_frame_dct = 1;
2103  s->chroma_format = 1;
2104  s->codec_id =
2105  s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2106  s->out_format = FMT_MPEG1;
2107  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2108  s->low_delay = 1;
2109 
2110  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2111  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2112  s->avctx->rc_buffer_size, s->bit_rate, s1->aspect_ratio_info);
2113 
2114  return 0;
2115 }
2116 
2117 static int vcr2_init_sequence(AVCodecContext *avctx)
2118 {
2119  Mpeg1Context *s1 = avctx->priv_data;
2120  MpegEncContext *s = &s1->mpeg_enc_ctx;
2121  int i, v, ret;
2122 
2123  /* start new MPEG-1 context decoding */
2124  s->out_format = FMT_MPEG1;
2125  if (s1->mpeg_enc_ctx_allocated) {
2126  ff_mpv_common_end(s);
2127  s1->mpeg_enc_ctx_allocated = 0;
2128  }
2129  s->width = avctx->coded_width;
2130  s->height = avctx->coded_height;
2131  avctx->has_b_frames = 0; // true?
2132  s->low_delay = 1;
2133 
2134  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2135 
2136  if ((ret = ff_mpv_common_init(s)) < 0)
2137  return ret;
2138  s1->mpeg_enc_ctx_allocated = 1;
2139 
2140  for (i = 0; i < 64; i++) {
2141  int j = s->idsp.idct_permutation[i];
2142  v = ff_mpeg1_default_intra_matrix[i];
2143  s->intra_matrix[j] = v;
2144  s->chroma_intra_matrix[j] = v;
2145 
2146  v = ff_mpeg1_default_non_intra_matrix[i];
2147  s->inter_matrix[j] = v;
2148  s->chroma_inter_matrix[j] = v;
2149  }
2150 
2151  s->progressive_sequence = 1;
2152  s->progressive_frame = 1;
2153  s->picture_structure = PICT_FRAME;
2154  s->first_field = 0;
2155  s->frame_pred_frame_dct = 1;
2156  s->chroma_format = 1;
2157  if (s->codec_tag == AV_RL32("BW10")) {
2158  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2159  } else {
2160  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2161  }
2162  s1->save_width = s->width;
2163  s1->save_height = s->height;
2164  s1->save_progressive_seq = s->progressive_sequence;
2165  return 0;
2166 }
2167 
2168 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2169  const uint8_t *p, int buf_size)
2170 {
2171  Mpeg1Context *s1 = avctx->priv_data;
2172 
2173  if (buf_size >= 6 &&
2174  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2175  p[4] == 3 && (p[5] & 0x40)) {
2176  /* extract A53 Part 4 CC data */
2177  int cc_count = p[5] & 0x1f;
2178  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2179  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2180  const uint64_t new_size = (old_size + cc_count
2181  * UINT64_C(3));
2182  int ret;
2183 
2184  if (new_size > 3*A53_MAX_CC_COUNT)
2185  return AVERROR(EINVAL);
2186 
2187  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2188  if (ret >= 0)
2189  memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
2190 
2191  avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2192  }
2193  return 1;
2194  } else if (buf_size >= 2 &&
2195  p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2196  /* extract SCTE-20 CC data */
2197  GetBitContext gb;
2198  int cc_count = 0;
2199  int i, ret;
2200 
2201  ret = init_get_bits8(&gb, p + 2, buf_size - 2);
2202  if (ret < 0)
2203  return ret;
2204  cc_count = get_bits(&gb, 5);
2205  if (cc_count > 0) {
2206  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2207  const uint64_t new_size = (old_size + cc_count
2208  * UINT64_C(3));
2209  if (new_size > 3*A53_MAX_CC_COUNT)
2210  return AVERROR(EINVAL);
2211 
2212  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2213  if (ret >= 0) {
2214  uint8_t field, cc1, cc2;
2215  uint8_t *cap = s1->a53_buf_ref->data;
2216 
2217  memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
2218  for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2219  skip_bits(&gb, 2); // priority
2220  field = get_bits(&gb, 2);
2221  skip_bits(&gb, 5); // line_offset
2222  cc1 = get_bits(&gb, 8);
2223  cc2 = get_bits(&gb, 8);
2224  skip_bits(&gb, 1); // marker
2225 
2226  if (!field) { // forbidden
2227  cap[0] = cap[1] = cap[2] = 0x00;
2228  } else {
2229  field = (field == 2 ? 1 : 0);
2230  if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2231  cap[0] = 0x04 | field;
2232  cap[1] = ff_reverse[cc1];
2233  cap[2] = ff_reverse[cc2];
2234  }
2235  cap += 3;
2236  }
2237  }
2238  avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2239  }
2240  return 1;
2241  } else if (buf_size >= 11 &&
2242  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2243  /* extract DVD CC data
2244  *
2245  * uint32_t user_data_start_code 0x000001B2 (big endian)
2246  * uint16_t user_identifier 0x4343 "CC"
2247  * uint8_t user_data_type_code 0x01
2248  * uint8_t caption_block_size 0xF8
2249  * uint8_t
2250  * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2251  * bit 6 caption_filler 0
2252  * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2253  * bit 0 caption_extra_field_added 1=one additional caption word
2254  *
2255  * struct caption_field_block {
2256  * uint8_t
2257  * bit 7:1 caption_filler 0x7F (all 1s)
2258  * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2259  * uint8_t caption_first_byte
2260  * uint8_t caption_second_byte
2261  * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2262  *
2263  * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2264  * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2265  * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2266  * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2267  * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2268  int cc_count = 0;
2269  int i, ret;
2270  // There is a caption count field in the data, but it is often
2271  // incorrect. So count the number of captions present.
2272  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2273  cc_count++;
2274  // Transform the DVD format into A53 Part 4 format
2275  if (cc_count > 0) {
2276  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2277  const uint64_t new_size = (old_size + cc_count
2278  * UINT64_C(6));
2279  if (new_size > 3*A53_MAX_CC_COUNT)
2280  return AVERROR(EINVAL);
2281 
2282  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2283  if (ret >= 0) {
2284  uint8_t field1 = !!(p[4] & 0x80);
2285  uint8_t *cap = s1->a53_buf_ref->data;
2286  p += 5;
2287  for (i = 0; i < cc_count; i++) {
2288  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2289  cap[1] = p[1];
2290  cap[2] = p[2];
2291  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2292  cap[4] = p[4];
2293  cap[5] = p[5];
2294  cap += 6;
2295  p += 6;
2296  }
2297  }
2298  avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2299  }
2300  return 1;
2301  }
2302  return 0;
2303 }
2304 
2305 static void mpeg_decode_user_data(AVCodecContext *avctx,
2306  const uint8_t *p, int buf_size)
2307 {
2308  Mpeg1Context *s = avctx->priv_data;
2309  const uint8_t *buf_end = p + buf_size;
2310  Mpeg1Context *s1 = avctx->priv_data;
2311 
2312 #if 0
2313  int i;
2314  for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2315  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2316  }
2317  av_log(avctx, AV_LOG_ERROR, "\n");
2318 #endif
2319 
2320  if (buf_size > 29){
2321  int i;
2322  for(i=0; i<20; i++)
2323  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2324  s->tmpgexs= 1;
2325  }
2326  }
2327  /* we parse the DTG active format information */
2328  if (buf_end - p >= 5 &&
2329  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2330  int flags = p[4];
2331  p += 5;
2332  if (flags & 0x80) {
2333  /* skip event id */
2334  p += 2;
2335  }
2336  if (flags & 0x40) {
2337  if (buf_end - p < 1)
2338  return;
2339  s1->has_afd = 1;
2340  s1->afd = p[0] & 0x0f;
2341  }
2342  } else if (buf_end - p >= 6 &&
2343  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2344  p[4] == 0x03) { // S3D_video_format_length
2345  // the 0x7F mask ignores the reserved_bit value
2346  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2347 
2348  if (S3D_video_format_type == 0x03 ||
2349  S3D_video_format_type == 0x04 ||
2350  S3D_video_format_type == 0x08 ||
2351  S3D_video_format_type == 0x23) {
2352 
2353  s1->has_stereo3d = 1;
2354 
2355  switch (S3D_video_format_type) {
2356  case 0x03:
2357  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2358  break;
2359  case 0x04:
2360  s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2361  break;
2362  case 0x08:
2363  s1->stereo3d.type = AV_STEREO3D_2D;
2364  break;
2365  case 0x23:
2366  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2367  break;
2368  }
2369  }
2370  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2371  return;
2372  }
2373 }
2374 
2375 static int mpeg_decode_gop(AVCodecContext *avctx,
2376  const uint8_t *buf, int buf_size)
2377 {
2378  Mpeg1Context *s1 = avctx->priv_data;
2379  MpegEncContext *s = &s1->mpeg_enc_ctx;
2380  int broken_link;
2381  int64_t tc;
2382 
2383  int ret = init_get_bits8(&s->gb, buf, buf_size);
2384  if (ret < 0)
2385  return ret;
2386 
2387  tc = s1->timecode_frame_start = get_bits(&s->gb, 25);
2388 
2389  s1->closed_gop = get_bits1(&s->gb);
2390  /* broken_link indicates that after editing the
2391  * reference frames of the first B-Frames after GOP I-Frame
2392  * are missing (open gop) */
2393  broken_link = get_bits1(&s->gb);
2394 
2395  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2396  char tcbuf[AV_TIMECODE_STR_SIZE];
2397  av_timecode_make_mpeg_tc_string(tcbuf, tc);
2398  av_log(s->avctx, AV_LOG_DEBUG,
2399  "GOP (%s) closed_gop=%d broken_link=%d\n",
2400  tcbuf, s1->closed_gop, broken_link);
2401  }
2402 
2403  return 0;
2404 }
2405 
2406 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2407  int *got_output, const uint8_t *buf, int buf_size)
2408 {
2409  Mpeg1Context *s = avctx->priv_data;
2410  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2411  const uint8_t *buf_ptr = buf;
2412  const uint8_t *buf_end = buf + buf_size;
2413  int ret, input_size;
2414  int last_code = 0, skip_frame = 0;
2415  int picture_start_code_seen = 0;
2416 
2417  for (;;) {
2418  /* find next start code */
2419  uint32_t start_code = -1;
2420  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2421  if (start_code > 0x1ff) {
2422  if (!skip_frame) {
2423  if (HAVE_THREADS &&
2424  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2425  !avctx->hwaccel) {
2426  int i;
2427  av_assert0(avctx->thread_count > 1);
2428 
2429  avctx->execute(avctx, slice_decode_thread,
2430  &s2->thread_context[0], NULL,
2431  s->slice_count, sizeof(void *));
2432  for (i = 0; i < s->slice_count; i++)
2433  s2->er.error_count += s2->thread_context[i]->er.error_count;
2434  }
2435 
2436  ret = slice_end(avctx, picture);
2437  if (ret < 0)
2438  return ret;
2439  else if (ret) {
2440  // FIXME: merge with the stuff in mpeg_decode_slice
2441  if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2442  *got_output = 1;
2443  }
2444  }
2445  s2->pict_type = 0;
2446 
2447  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2448  return AVERROR_INVALIDDATA;
2449 
2450  return FFMAX(0, buf_ptr - buf);
2451  }
2452 
2453  input_size = buf_end - buf_ptr;
2454 
2455  if (avctx->debug & FF_DEBUG_STARTCODE)
2456  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2457  start_code, buf_ptr - buf, input_size);
2458 
2459  /* prepare data for next start code */
2460  switch (start_code) {
2461  case SEQ_START_CODE:
2462  if (last_code == 0) {
2463  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2464  if (buf != avctx->extradata)
2465  s->sync = 1;
2466  } else {
2467  av_log(avctx, AV_LOG_ERROR,
2468  "ignoring SEQ_START_CODE after %X\n", last_code);
2469  if (avctx->err_recognition & AV_EF_EXPLODE)
2470  return AVERROR_INVALIDDATA;
2471  }
2472  break;
2473 
2474  case PICTURE_START_CODE:
2475  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2476  /* If it's a frame picture, there can't be more than one picture header.
2477  Yet, it does happen and we need to handle it. */
2478  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2479  break;
2480  }
2481  picture_start_code_seen = 1;
2482 
2483  if (buf == avctx->extradata && avctx->codec_tag == AV_RL32("AVmp")) {
2484  av_log(avctx, AV_LOG_WARNING, "ignoring picture start code in AVmp extradata\n");
2485  break;
2486  }
2487 
2488  if (s2->width <= 0 || s2->height <= 0) {
2489  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2490  s2->width, s2->height);
2491  return AVERROR_INVALIDDATA;
2492  }
2493 
2494  if (s->tmpgexs){
2495  s2->intra_dc_precision= 3;
2496  s2->intra_matrix[0]= 1;
2497  }
2498  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2499  !avctx->hwaccel && s->slice_count) {
2500  int i;
2501 
2502  avctx->execute(avctx, slice_decode_thread,
2503  s2->thread_context, NULL,
2504  s->slice_count, sizeof(void *));
2505  for (i = 0; i < s->slice_count; i++)
2506  s2->er.error_count += s2->thread_context[i]->er.error_count;
2507  s->slice_count = 0;
2508  }
2509  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2510  ret = mpeg_decode_postinit(avctx);
2511  if (ret < 0) {
2512  av_log(avctx, AV_LOG_ERROR,
2513  "mpeg_decode_postinit() failure\n");
2514  return ret;
2515  }
2516 
2517  /* We have a complete image: we try to decompress it. */
2518  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2519  s2->pict_type = 0;
2520  s->first_slice = 1;
2521  last_code = PICTURE_START_CODE;
2522  } else {
2523  av_log(avctx, AV_LOG_ERROR,
2524  "ignoring pic after %X\n", last_code);
2525  if (avctx->err_recognition & AV_EF_EXPLODE)
2526  return AVERROR_INVALIDDATA;
2527  }
2528  break;
2529  case EXT_START_CODE:
2530  ret = init_get_bits8(&s2->gb, buf_ptr, input_size);
2531  if (ret < 0)
2532  return ret;
2533 
2534  switch (get_bits(&s2->gb, 4)) {
2535  case 0x1:
2536  if (last_code == 0) {
2537  mpeg_decode_sequence_extension(s);
2538  } else {
2539  av_log(avctx, AV_LOG_ERROR,
2540  "ignoring seq ext after %X\n", last_code);
2541  if (avctx->err_recognition & AV_EF_EXPLODE)
2542  return AVERROR_INVALIDDATA;
2543  }
2544  break;
2545  case 0x2:
2546  mpeg_decode_sequence_display_extension(s);
2547  break;
2548  case 0x3:
2549  mpeg_decode_quant_matrix_extension(s2);
2550  break;
2551  case 0x7:
2552  mpeg_decode_picture_display_extension(s);
2553  break;
2554  case 0x8:
2555  if (last_code == PICTURE_START_CODE) {
2556  int ret = mpeg_decode_picture_coding_extension(s);
2557  if (ret < 0)
2558  return ret;
2559  } else {
2560  av_log(avctx, AV_LOG_ERROR,
2561  "ignoring pic cod ext after %X\n", last_code);
2562  if (avctx->err_recognition & AV_EF_EXPLODE)
2563  return AVERROR_INVALIDDATA;
2564  }
2565  break;
2566  }
2567  break;
2568  case USER_START_CODE:
2569  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2570  break;
2571  case GOP_START_CODE:
2572  if (last_code == 0) {
2573  s2->first_field = 0;
2574  ret = mpeg_decode_gop(avctx, buf_ptr, input_size);
2575  if (ret < 0)
2576  return ret;
2577  s->sync = 1;
2578  } else {
2579  av_log(avctx, AV_LOG_ERROR,
2580  "ignoring GOP_START_CODE after %X\n", last_code);
2581  if (avctx->err_recognition & AV_EF_EXPLODE)
2582  return AVERROR_INVALIDDATA;
2583  }
2584  break;
2585  default:
2586  if (start_code >= SLICE_MIN_START_CODE &&
2587  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2588  if (s2->progressive_sequence && !s2->progressive_frame) {
2589  s2->progressive_frame = 1;
2590  av_log(s2->avctx, AV_LOG_ERROR,
2591  "interlaced frame in progressive sequence, ignoring\n");
2592  }
2593 
2594  if (s2->picture_structure == 0 ||
2595  (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2596  av_log(s2->avctx, AV_LOG_ERROR,
2597  "picture_structure %d invalid, ignoring\n",
2598  s2->picture_structure);
2599  s2->picture_structure = PICT_FRAME;
2600  }
2601 
2602  if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2603  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2604 
2605  if (s2->picture_structure == PICT_FRAME) {
2606  s2->first_field = 0;
2607  s2->v_edge_pos = 16 * s2->mb_height;
2608  } else {
2609  s2->first_field ^= 1;
2610  s2->v_edge_pos = 8 * s2->mb_height;
2611  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2612  }
2613  }
2614  if (start_code >= SLICE_MIN_START_CODE &&
2615  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2616  const int field_pic = s2->picture_structure != PICT_FRAME;
2617  int mb_y = start_code - SLICE_MIN_START_CODE;
2618  last_code = SLICE_MIN_START_CODE;
2619  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2620  mb_y += (*buf_ptr&0xE0)<<2;
2621 
2622  mb_y <<= field_pic;
2623  if (s2->picture_structure == PICT_BOTTOM_FIELD)
2624  mb_y++;
2625 
2626  if (buf_end - buf_ptr < 2) {
2627  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2628  return AVERROR_INVALIDDATA;
2629  }
2630 
2631  if (mb_y >= s2->mb_height) {
2632  av_log(s2->avctx, AV_LOG_ERROR,
2633  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2634  return AVERROR_INVALIDDATA;
2635  }
2636 
2637  if (!s2->last_picture_ptr) {
2638  /* Skip B-frames if we do not have reference frames and
2639  * GOP is not closed. */
2640  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2641  if (!s->closed_gop) {
2642  skip_frame = 1;
2643  av_log(s2->avctx, AV_LOG_DEBUG,
2644  "Skipping B slice due to open GOP\n");
2645  break;
2646  }
2647  }
2648  }
2649  if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2650  s->sync = 1;
2651  if (!s2->next_picture_ptr) {
2652  /* Skip P-frames if we do not have a reference frame or
2653  * we have an invalid header. */
2654  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2655  skip_frame = 1;
2656  av_log(s2->avctx, AV_LOG_DEBUG,
2657  "Skipping P slice due to !sync\n");
2658  break;
2659  }
2660  }
2661  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2662  s2->pict_type == AV_PICTURE_TYPE_B) ||
2663  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2664  s2->pict_type != AV_PICTURE_TYPE_I) ||
2665  avctx->skip_frame >= AVDISCARD_ALL) {
2666  skip_frame = 1;
2667  break;
2668  }
2669 
2670  if (!s->mpeg_enc_ctx_allocated)
2671  break;
2672 
2673  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2674  if (mb_y < avctx->skip_top ||
2675  mb_y >= s2->mb_height - avctx->skip_bottom)
2676  break;
2677  }
2678 
2679  if (!s2->pict_type) {
2680  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2681  if (avctx->err_recognition & AV_EF_EXPLODE)
2682  return AVERROR_INVALIDDATA;
2683  break;
2684  }
2685 
2686  if (s->first_slice) {
2687  skip_frame = 0;
2688  s->first_slice = 0;
2689  if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2690  return ret;
2691  }
2692  if (!s2->current_picture_ptr) {
2693  av_log(avctx, AV_LOG_ERROR,
2694  "current_picture not initialized\n");
2695  return AVERROR_INVALIDDATA;
2696  }
2697 
2698  if (HAVE_THREADS &&
2699  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2700  !avctx->hwaccel) {
2701  int threshold = (s2->mb_height * s->slice_count +
2702  s2->slice_context_count / 2) /
2703  s2->slice_context_count;
2704  av_assert0(avctx->thread_count > 1);
2705  if (threshold <= mb_y) {
2706  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2707 
2708  thread_context->start_mb_y = mb_y;
2709  thread_context->end_mb_y = s2->mb_height;
2710  if (s->slice_count) {
2711  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2712  ret = ff_update_duplicate_context(thread_context, s2);
2713  if (ret < 0)
2714  return ret;
2715  }
2716  ret = init_get_bits8(&thread_context->gb, buf_ptr, input_size);
2717  if (ret < 0)
2718  return ret;
2719  s->slice_count++;
2720  }
2721  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2722  } else {
2723  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2724  emms_c();
2725 
2726  if (ret < 0) {
2727  if (avctx->err_recognition & AV_EF_EXPLODE)
2728  return ret;
2729  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2730  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2731  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2732  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2733  } else {
2734  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2735  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2736  ER_AC_END | ER_DC_END | ER_MV_END);
2737  }
2738  }
2739  }
2740  break;
2741  }
2742  }
2743 }
2744 
2745 static int mpeg_decode_frame(AVCodecContext *avctx, AVFrame *picture,
2746  int *got_output, AVPacket *avpkt)
2747 {
2748  const uint8_t *buf = avpkt->data;
2749  int ret;
2750  int buf_size = avpkt->size;
2751  Mpeg1Context *s = avctx->priv_data;
2752  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2753 
2754  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2755  /* special case for last picture */
2756  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2757  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2758  if (ret < 0)
2759  return ret;
2760 
2761  s2->next_picture_ptr = NULL;
2762 
2763  *got_output = 1;
2764  }
2765  return buf_size;
2766  }
2767 
2768  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2769  || s2->codec_tag == AV_RL32("BW10")
2770  ))
2771  vcr2_init_sequence(avctx);
2772 
2773  s->slice_count = 0;
2774 
2775  if (avctx->extradata && !s->extradata_decoded) {
2776  ret = decode_chunks(avctx, picture, got_output,
2777  avctx->extradata, avctx->extradata_size);
2778  if (*got_output) {
2779  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2780  av_frame_unref(picture);
2781  *got_output = 0;
2782  }
2783  s->extradata_decoded = 1;
2784  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2785  s2->current_picture_ptr = NULL;
2786  return ret;
2787  }
2788  }
2789 
2790  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2791  if (ret<0 || *got_output) {
2792  s2->current_picture_ptr = NULL;
2793 
2794  if (s->timecode_frame_start != -1 && *got_output) {
2795  char tcbuf[AV_TIMECODE_STR_SIZE];
2796  AVFrameSideData *tcside = av_frame_new_side_data(picture,
2797  AV_FRAME_DATA_GOP_TIMECODE,
2798  sizeof(int64_t));
2799  if (!tcside)
2800  return AVERROR(ENOMEM);
2801  memcpy(tcside->data, &s->timecode_frame_start, sizeof(int64_t));
2802 
2803  av_timecode_make_mpeg_tc_string(tcbuf, s->timecode_frame_start);
2804  av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
2805 
2806  s->timecode_frame_start = -1;
2807  }
2808  }
2809 
2810  return ret;
2811 }
2812 
2813 static void flush(AVCodecContext *avctx)
2814 {
2815  Mpeg1Context *s = avctx->priv_data;
2816 
2817  s->sync = 0;
2818  s->closed_gop = 0;
2819 
2820  av_buffer_unref(&s->a53_buf_ref);
2821  ff_mpeg_flush(avctx);
2822 }
2823 
2824 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2825 {
2826  Mpeg1Context *s = avctx->priv_data;
2827 
2828  if (s->mpeg_enc_ctx_allocated)
2829  ff_mpv_common_end(&s->mpeg_enc_ctx);
2830  av_buffer_unref(&s->a53_buf_ref);
2831  return 0;
2832 }
2833 
2834 const FFCodec ff_mpeg1video_decoder = {
2835  .p.name = "mpeg1video",
2836  CODEC_LONG_NAME("MPEG-1 video"),
2837  .p.type = AVMEDIA_TYPE_VIDEO,
2838  .p.id = AV_CODEC_ID_MPEG1VIDEO,
2839  .priv_data_size = sizeof(Mpeg1Context),
2840  .init = mpeg_decode_init,
2841  .close = mpeg_decode_end,
2842  FF_CODEC_DECODE_CB(mpeg_decode_frame),
2843  .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2844  AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2845  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2846  .flush = flush,
2847  .p.max_lowres = 3,
2848  UPDATE_THREAD_CONTEXT(mpeg_decode_update_thread_context),
2849  .hw_configs = (const AVCodecHWConfigInternal *const []) {
2850 #if CONFIG_MPEG1_NVDEC_HWACCEL
2851  HWACCEL_NVDEC(mpeg1),
2852 #endif
2853 #if CONFIG_MPEG1_VDPAU_HWACCEL
2854  HWACCEL_VDPAU(mpeg1),
2855 #endif
2856 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2857  HWACCEL_VIDEOTOOLBOX(mpeg1),
2858 #endif
2859  NULL
2860  },
2861 };
2862 
2863 const FFCodec ff_mpeg2video_decoder = {
2864  .p.name = "mpeg2video",
2865  CODEC_LONG_NAME("MPEG-2 video"),
2866  .p.type = AVMEDIA_TYPE_VIDEO,
2867  .p.id = AV_CODEC_ID_MPEG2VIDEO,
2868  .priv_data_size = sizeof(Mpeg1Context),
2869  .init = mpeg_decode_init,
2870  .close = mpeg_decode_end,
2871  FF_CODEC_DECODE_CB(mpeg_decode_frame),
2872  .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2873  AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2874  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2875  .flush = flush,
2876  .p.max_lowres = 3,
2877  .p.profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2878  .hw_configs = (const AVCodecHWConfigInternal *const []) {
2879 #if CONFIG_MPEG2_DXVA2_HWACCEL
2880  HWACCEL_DXVA2(mpeg2),
2881 #endif
2882 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2883  HWACCEL_D3D11VA(mpeg2),
2884 #endif
2885 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2886  HWACCEL_D3D11VA2(mpeg2),
2887 #endif
2888 #if CONFIG_MPEG2_NVDEC_HWACCEL
2889  HWACCEL_NVDEC(mpeg2),
2890 #endif
2891 #if CONFIG_MPEG2_VAAPI_HWACCEL
2892  HWACCEL_VAAPI(mpeg2),
2893 #endif
2894 #if CONFIG_MPEG2_VDPAU_HWACCEL
2895  HWACCEL_VDPAU(mpeg2),
2896 #endif
2897 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2898  HWACCEL_VIDEOTOOLBOX(mpeg2),
2899 #endif
2900  NULL
2901  },
2902 };
2903 
2904 //legacy decoder
2905 const FFCodec ff_mpegvideo_decoder = {
2906  .p.name = "mpegvideo",
2907  CODEC_LONG_NAME("MPEG-1 video"),
2908  .p.type = AVMEDIA_TYPE_VIDEO,
2909  .p.id = AV_CODEC_ID_MPEG2VIDEO,
2910  .priv_data_size = sizeof(Mpeg1Context),
2911  .init = mpeg_decode_init,
2912  .close = mpeg_decode_end,
2913  FF_CODEC_DECODE_CB(mpeg_decode_frame),
2914  .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2915  AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2916  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2917  .flush = flush,
2918  .p.max_lowres = 3,
2919 };
2920 
2921 typedef struct IPUContext {
2922  MpegEncContext m;
2923 
2924  int flags;
2925  DECLARE_ALIGNED(32, int16_t, block)[6][64];
2926 } IPUContext;
2927 
2928 static int ipu_decode_frame(AVCodecContext *avctx, AVFrame *frame,
2929  int *got_frame, AVPacket *avpkt)
2930 {
2931  IPUContext *s = avctx->priv_data;
2932  MpegEncContext *m = &s->m;
2933  GetBitContext *gb = &m->gb;
2934  int ret;
2935 
2936  // Check for minimal intra MB size (considering mb header, luma & chroma dc VLC, ac EOB VLC)
2937  if (avpkt->size*8LL < (avctx->width+15)/16 * ((avctx->height+15)/16) * (2 + 3*4 + 2*2 + 2*6))
2938  return AVERROR_INVALIDDATA;
2939 
2940  ret = ff_get_buffer(avctx, frame, 0);
2941  if (ret < 0)
2942  return ret;
2943 
2944  ret = init_get_bits8(gb, avpkt->data, avpkt->size);
2945  if (ret < 0)
2946  return ret;
2947 
2948  s->flags = get_bits(gb, 8);
2949  m->intra_dc_precision = s->flags & 3;
2950  m->q_scale_type = !!(s->flags & 0x40);
2951  m->intra_vlc_format = !!(s->flags & 0x20);
2952  m->alternate_scan = !!(s->flags & 0x10);
2953 
2954  if (s->flags & 0x10) {
2955  ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_alternate_vertical_scan);
2956  ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_alternate_vertical_scan);
2957  } else {
2958  ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_zigzag_direct);
2959  ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_zigzag_direct);
2960  }
2961 
2962  m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3));
2963  m->qscale = 1;
2964 
2965  for (int y = 0; y < avctx->height; y += 16) {
2966  int intraquant;
2967 
2968  for (int x = 0; x < avctx->width; x += 16) {
2969  if (x || y) {
2970  if (!get_bits1(gb))
2971  return AVERROR_INVALIDDATA;
2972  }
2973  if (get_bits1(gb)) {
2974  intraquant = 0;
2975  } else {
2976  if (!get_bits1(gb))
2977  return AVERROR_INVALIDDATA;
2978  intraquant = 1;
2979  }
2980 
2981  if (s->flags & 4)
2982  skip_bits1(gb);
2983 
2984  if (intraquant)
2985  m->qscale = mpeg_get_qscale(m);
2986 
2987  memset(s->block, 0, sizeof(s->block));
2988 
2989  for (int n = 0; n < 6; n++) {
2990  if (s->flags & 0x80) {
2991  ret = ff_mpeg1_decode_block_intra(&m->gb,
2992  m->intra_matrix,
2993  m->intra_scantable.permutated,
2994  m->last_dc, s->block[n],
2995  n, m->qscale);
2996  if (ret >= 0)
2997  m->block_last_index[n] = ret;
2998  } else {
2999  ret = mpeg2_decode_block_intra(m, s->block[n], n);
3000  }
3001 
3002  if (ret < 0)
3003  return ret;
3004  }
3005 
3006  m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
3007  frame->linesize[0], s->block[0]);
3008  m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
3009  frame->linesize[0], s->block[1]);
3010  m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
3011  frame->linesize[0], s->block[2]);
3012  m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
3013  frame->linesize[0], s->block[3]);
3014  m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
3015  frame->linesize[1], s->block[4]);
3016  m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
3017  frame->linesize[2], s->block[5]);
3018  }
3019  }
3020 
3021  align_get_bits(gb);
3022  if (get_bits_left(gb) != 32)
3023  return AVERROR_INVALIDDATA;
3024 
3025  frame->pict_type = AV_PICTURE_TYPE_I;
3026  frame->flags |= AV_FRAME_FLAG_KEY;
3027  *got_frame = 1;
3028 
3029  return avpkt->size;
3030 }
3031 
3032 static av_cold int ipu_decode_init(AVCodecContext *avctx)
3033 {
3034  IPUContext *s = avctx->priv_data;
3035  MpegEncContext *m = &s->m;
3036 
3037  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
3038 
3039  ff_mpv_decode_init(m, avctx);
3040  ff_mpeg12_init_vlcs();
3041 
3042  for (int i = 0; i < 64; i++) {
3043  int j = m->idsp.idct_permutation[i];
3044  int v = ff_mpeg1_default_intra_matrix[i];
3045  m->intra_matrix[j] = v;
3046  m->chroma_intra_matrix[j] = v;
3047  }
3048 
3049  for (int i = 0; i < 64; i++) {
3050  int j = m->idsp.idct_permutation[i];
3051  int v = ff_mpeg1_default_non_intra_matrix[i];
3052  m->inter_matrix[j] = v;
3053  m->chroma_inter_matrix[j] = v;
3054  }
3055 
3056  return 0;
3057 }
3058 
3059 static av_cold int ipu_decode_end(AVCodecContext *avctx)
3060 {
3061  IPUContext *s = avctx->priv_data;
3062 
3063  ff_mpv_common_end(&s->m);
3064 
3065  return 0;
3066 }
3067 
3068 const FFCodec ff_ipu_decoder = {
3069  .p.name = "ipu",
3070  CODEC_LONG_NAME("IPU Video"),
3071  .p.type = AVMEDIA_TYPE_VIDEO,
3072  .p.id = AV_CODEC_ID_IPU,
3073  .priv_data_size = sizeof(IPUContext),
3074  .init = ipu_decode_init,
3075  FF_CODEC_DECODE_CB(ipu_decode_frame),
3076  .close = ipu_decode_end,
3077  .p.capabilities = AV_CODEC_CAP_DR1,
3078  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
3079 };
PICT_FRAME
#define PICT_FRAME
Definition: mpegutils.h:38
vcr2_init_sequence
static int vcr2_init_sequence(AVCodecContext *avctx)
Definition: mpeg12dec.c:2117
ff_mpv_common_init
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:681
hwconfig.h
AVCodecContext::hwaccel
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1435
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
MB_TYPE_L0
#define MB_TYPE_L0
Definition: mpegutils.h:60
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:261
Mpeg1Context::has_afd
int has_afd
Definition: mpeg12dec.c:74
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AV_TIMECODE_STR_SIZE
#define AV_TIMECODE_STR_SIZE
Definition: timecode.h:33
AV_PIX_FMT_CUDA
@ AV_PIX_FMT_CUDA
HW acceleration through CUDA.
Definition: pixfmt.h:253
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
level
uint8_t level
Definition: svq3.c:204
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: defs.h:51
Mpeg1Context::a53_buf_ref
AVBufferRef * a53_buf_ref
Definition: mpeg12dec.c:72
ff_mpeg2_aspect
const AVRational ff_mpeg2_aspect[16]
Definition: mpeg12data.c:380
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
show_bits_long
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:495
mpeg_decode_a53_cc
static int mpeg_decode_a53_cc(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2168
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:694
FMT_MPEG1
@ FMT_MPEG1
Definition: mpegutils.h:117
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
decode_slice
static int decode_slice(AVCodecContext *c, void *arg)
Definition: ffv1dec.c:255
ff_mpv_export_qp_table
int ff_mpv_export_qp_table(const MpegEncContext *s, AVFrame *f, const Picture *p, int qp_type)
Definition: mpegvideo_dec.c:511
AV_STEREO3D_SIDEBYSIDE_QUINCUNX
@ AV_STEREO3D_SIDEBYSIDE_QUINCUNX
Views are next to each other, but when upscaling apply a checkerboard pattern.
Definition: stereo3d.h:114
FF_MPV_QSCALE_TYPE_MPEG2
#define FF_MPV_QSCALE_TYPE_MPEG2
Definition: mpegvideodec.h:41
mem_internal.h
ff_get_format
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: decode.c:1264
mpeg_decode_frame
static int mpeg_decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_output, AVPacket *avpkt)
Definition: mpeg12dec.c:2745
MpegEncContext::gb
GetBitContext gb
Definition: mpegvideo.h:425
AV_EF_COMPLIANT
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: defs.h:55
SEQ_END_CODE
#define SEQ_END_CODE
Definition: mpeg12.h:28
av_frame_new_side_data
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, size_t size)
Add a new side data to a frame.
Definition: frame.c:812
check_scantable_index
#define check_scantable_index(ctx, x)
Definition: mpeg12dec.c:143
AV_FRAME_DATA_A53_CC
@ AV_FRAME_DATA_A53_CC
ATSC A53 Part 4 Closed Captions.
Definition: frame.h:59
MT_FIELD
#define MT_FIELD
Definition: mpeg12dec.c:655
EXT_START_CODE
#define EXT_START_CODE
Definition: cavs.h:39
MV_TYPE_16X8
#define MV_TYPE_16X8
2 vectors, one per 16x8 block
Definition: mpegvideo.h:263
ff_mbincr_vlc
VLC ff_mbincr_vlc
Definition: mpeg12.c:123
av_div_q
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
AVPanScan
Pan Scan area.
Definition: defs.h:240
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1412
SLICE_MAX_START_CODE
#define SLICE_MAX_START_CODE
Definition: cavs.h:38
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: mpegutils.h:48
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:266
ipu_decode_init
static av_cold int ipu_decode_init(AVCodecContext *avctx)
Definition: mpeg12dec.c:3032
ff_update_duplicate_context
int ff_update_duplicate_context(MpegEncContext *dst, const MpegEncContext *src)
Definition: mpegvideo.c:490
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
start_code
static const uint8_t start_code[]
Definition: videotoolboxenc.c:218
ff_mpv_report_decode_progress
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo_dec.c:570
w
uint8_t w
Definition: llviddspenc.c:38
HWACCEL_DXVA2
#define HWACCEL_DXVA2(codec)
Definition: hwconfig.h:64
ff_mpegvideo_decoder
const FFCodec ff_mpegvideo_decoder
Definition: mpeg12dec.c:2905
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:491
ipu_decode_end
static av_cold int ipu_decode_end(AVCodecContext *avctx)
Definition: mpeg12dec.c:3059
mpeg_decode_mb
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpeg12dec.c:660
Mpeg1Context::closed_gop
int closed_gop
Definition: mpeg12dec.c:82
mpeg2_decode_block_intra
static int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:484
HWACCEL_D3D11VA2
#define HWACCEL_D3D11VA2(codec)
Definition: hwconfig.h:66
ff_reverse
const uint8_t ff_reverse[256]
Definition: reverse.c:23
MpegEncContext::last_dc
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:175
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: mpegutils.h:47
AV_PIX_FMT_D3D11VA_VLD
@ AV_PIX_FMT_D3D11VA_VLD
HW decoding through Direct3D11 via old API, Picture.data[3] contains a ID3D11VideoDecoderOutputView p...
Definition: pixfmt.h:247
FFCodec
Definition: codec_internal.h:127
mpeg2_fast_decode_block_intra
static int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
Changing this would eat up any speed benefits it has.
Definition: mpeg12dec.c:570
PICT_BOTTOM_FIELD
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:37
FF_HW_SIMPLE_CALL
#define FF_HW_SIMPLE_CALL(avctx, function)
Definition: hwaccel_internal.h:174
ff_er_add_slice
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
Definition: error_resilience.c:822
ff_init_block_index
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:845
reverse.h
mpegvideo.h
MB_TYPE_L1
#define MB_TYPE_L1
Definition: mpegutils.h:61
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:225
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:649
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
Mpeg1Context::first_slice
int first_slice
Definition: mpeg12dec.c:84
ER_DC_END
#define ER_DC_END
Definition: error_resilience.h:34
mpeg_decode_postinit
static int mpeg_decode_postinit(AVCodecContext *avctx)
Definition: mpeg12dec.c:1161
mpegutils.h
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:94
ER_MV_ERROR
#define ER_MV_ERROR
Definition: error_resilience.h:32
thread.h
ff_mb_pat_vlc
VLC ff_mb_pat_vlc
Definition: mpeg12.c:126
SEQ_START_CODE
#define SEQ_START_CODE
Definition: mpeg12.h:29
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1389
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:361
MV_TYPE_DMV
#define MV_TYPE_DMV
2 vectors, special mpeg2 Dual Prime Vectors
Definition: mpegvideo.h:265
GET_CACHE
#define GET_CACHE(name, gb)
Definition: get_bits.h:263
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:381
ff_mpeg2_rl_vlc
RL_VLC_ELEM ff_mpeg2_rl_vlc[674]
Definition: mpeg12.c:129
Mpeg1Context::save_aspect
AVRational save_aspect
Definition: mpeg12dec.c:77
MpegEncContext::intra_scantable
ScanTable intra_scantable
Definition: mpegvideo.h:81
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:1803
AV_STEREO3D_SIDEBYSIDE
@ AV_STEREO3D_SIDEBYSIDE
Views are next to each other.
Definition: stereo3d.h:64
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
MB_TYPE_ZERO_MV
#define MB_TYPE_ZERO_MV
Definition: mpeg12dec.c:89
MT_DMV
#define MT_DMV
Definition: mpeg12dec.c:658
ff_mpv_reconstruct_mb
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo_dec.c:1014
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
decode_chunks
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture, int *got_output, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2406
AVCodecContext::skip_frame
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:1766
mpeg_decode_quant_matrix_extension
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
Definition: mpeg12dec.c:1463
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1532
AV_STEREO3D_2D
@ AV_STEREO3D_2D
Video is not stereoscopic (and metadata has to be there).
Definition: stereo3d.h:52
wrap
#define wrap(func)
Definition: neontest.h:65
timecode.h
GetBitContext
Definition: get_bits.h:108
AV_EF_BITSTREAM
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: defs.h:49
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:92
slice_decode_thread
static int slice_decode_thread(AVCodecContext *c, void *arg)
Definition: mpeg12dec.c:1926
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:521
IDCTDSPContext::idct_put
void(* idct_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:64
MB_TYPE_CBP
#define MB_TYPE_CBP
Definition: mpegutils.h:64
val
static double val(void *priv, double ch)
Definition: aeval.c:78
Mpeg1Context::tmpgexs
int tmpgexs
Definition: mpeg12dec.c:83
HWACCEL_VDPAU
#define HWACCEL_VDPAU(codec)
Definition: hwconfig.h:72
AV_CODEC_FLAG_LOW_DELAY
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:330
mpeg12_pixfmt_list_444
static enum AVPixelFormat mpeg12_pixfmt_list_444[]
Definition: mpeg12dec.c:1133
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:636
ff_print_debug_info
void ff_print_debug_info(const MpegEncContext *s, const Picture *p, AVFrame *pict)
Definition: mpegvideo_dec.c:504
mpeg1_decode_sequence
static int mpeg1_decode_sequence(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2027
av_reduce
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
HAS_CBP
#define HAS_CBP(a)
Definition: mpegutils.h:94
AVRational::num
int num
Numerator.
Definition: rational.h:59
GOP_START_CODE
#define GOP_START_CODE
Definition: mpeg12.h:30
IPUContext
Definition: mpeg12dec.c:2921
mpeg1_hwaccel_pixfmt_list_420
static enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[]
Definition: mpeg12dec.c:1093
ff_mpv_common_end
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:782
mpeg12.h
mpegvideodec.h
ff_mpeg2video_decoder
const FFCodec ff_mpeg2video_decoder
Definition: mpeg12dec.c:2863
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
Mpeg1Context::frame_rate_index
unsigned frame_rate_index
Definition: mpeg12dec.c:80
ipu_decode_frame
static int ipu_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: mpeg12dec.c:2928
ER_DC_ERROR
#define ER_DC_ERROR
Definition: error_resilience.h:31
av_cold
#define av_cold
Definition: attributes.h:90
mpeg2_hwaccel_pixfmt_list_420
static enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[]
Definition: mpeg12dec.c:1104
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:545
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:628
mpeg1_decode_picture
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:1292
flush
static void flush(AVCodecContext *avctx)
Definition: mpeg12dec.c:2813
Mpeg1Context::save_progressive_seq
int save_progressive_seq
Definition: mpeg12dec.c:78
emms_c
#define emms_c()
Definition: emms.h:63
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:188
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:543
AVCodecContext::has_b_frames
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:744
A53_MAX_CC_COUNT
#define A53_MAX_CC_COUNT
Definition: mpeg12dec.c:63
ff_er_frame_end
void ff_er_frame_end(ERContext *s, int *decode_error_flags)
Indicate that a frame has finished decoding and perform error concealment in case it has been enabled...
Definition: error_resilience.c:892
Mpeg1Context::repeat_field
int repeat_field
Definition: mpeg12dec.c:68
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:306
stereo3d.h
AV_PIX_FMT_DXVA2_VLD
@ AV_PIX_FMT_DXVA2_VLD
HW decoding through DXVA2, Picture.data[3] contains a LPDIRECT3DSURFACE9 pointer.
Definition: pixfmt.h:127
s
#define s(width, name)
Definition: cbs_vp9.c:198
ff_mpeg1_aspect
const float ff_mpeg1_aspect[16]
Definition: mpeg12data.c:359
s1
#define s1
Definition: regdef.h:38
slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:1979
Mpeg1Context::mpeg_enc_ctx_allocated
int mpeg_enc_ctx_allocated
Definition: mpeg12dec.c:67
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:260
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:365
ff_mpeg_er_frame_start
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:47
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
Mpeg1Context::aspect_ratio_info
unsigned aspect_ratio_info
Definition: mpeg12dec.c:76
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:304
mpeg_decode_sequence_display_extension
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1382
Mpeg1Context::pan_scan
AVPanScan pan_scan
Definition: mpeg12dec.c:69
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:320
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
ctx
AVFormatContext * ctx
Definition: movenc.c:48
PICT_TOP_FIELD
#define PICT_TOP_FIELD
Definition: mpegutils.h:36
decode.h
mpeg12_pixfmt_list_422
static enum AVPixelFormat mpeg12_pixfmt_list_422[]
Definition: mpeg12dec.c:1128
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:241
IS_INTRA
#define IS_INTRA(x, y)
field
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this field
Definition: writing_filters.txt:78
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
AVCodecContext::rc_max_rate
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:1284
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
frame
static AVFrame * frame
Definition: demux_decode.c:54
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:451
arg
const char * arg
Definition: jacosubdec.c:67
if
if(ret)
Definition: filter_design.txt:179
AVDISCARD_ALL
@ AVDISCARD_ALL
discard all
Definition: defs.h:219
MB_PTYPE_VLC_BITS
#define MB_PTYPE_VLC_BITS
Definition: mpeg12vlc.h:39
Mpeg1Context::save_width
int save_width
Definition: mpeg12dec.c:78
PTRDIFF_SPECIFIER
#define PTRDIFF_SPECIFIER
Definition: internal.h:140
NULL
#define NULL
Definition: coverity.c:32
run
uint8_t run
Definition: svq3.c:203
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1039
av_buffer_unref
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:139
ER_AC_ERROR
#define ER_AC_ERROR
Definition: error_resilience.h:30
SLICE_MIN_START_CODE
#define SLICE_MIN_START_CODE
Definition: mpeg12.h:32
hwaccel_internal.h
Mpeg1Context::sync
int sync
Definition: mpeg12dec.c:81
AVCHROMA_LOC_LEFT
@ AVCHROMA_LOC_LEFT
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:694
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVCHROMA_LOC_TOPLEFT
@ AVCHROMA_LOC_TOPLEFT
ITU-R 601, SMPTE 274M 296M S314M(DV 4:1:1), mpeg2 4:2:2.
Definition: pixfmt.h:696
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:491
mpeg_decode_picture_display_extension
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1406
MpegEncContext::inter_matrix
uint16_t inter_matrix[64]
Definition: mpegvideo.h:297
AV_CODEC_FLAG2_FAST
#define AV_CODEC_FLAG2_FAST
Allow non spec compliant speedup tricks.
Definition: avcodec.h:353
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
profiles.h
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:247
MB_TYPE_QUANT
#define MB_TYPE_QUANT
Definition: mpegutils.h:63
avpriv_find_start_code
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
lowres
static int lowres
Definition: ffplay.c:332
av_frame_new_side_data_from_buf
AVFrameSideData * av_frame_new_side_data_from_buf(AVFrame *frame, enum AVFrameSideDataType type, AVBufferRef *buf)
Add a new side data to a frame from an existing AVBufferRef.
Definition: frame.c:780
ff_mpeg1_rl_vlc
RL_VLC_ELEM ff_mpeg1_rl_vlc[680]
Definition: mpeg12.c:128
MB_BTYPE_VLC_BITS
#define MB_BTYPE_VLC_BITS
Definition: mpeg12vlc.h:40
UPDATE_THREAD_CONTEXT
#define UPDATE_THREAD_CONTEXT(func)
Definition: codec_internal.h:281
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
mpeg12codecs.h
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:652
AV_FRAME_DATA_AFD
@ AV_FRAME_DATA_AFD
Active Format Description data consisting of a single byte as specified in ETSI TS 101 154 using AVAc...
Definition: frame.h:90
AVCodecContext::level
int level
Encoding level descriptor.
Definition: avcodec.h:1740
Mpeg1Context::save_height
int save_height
Definition: mpeg12dec.c:78
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AV_CODEC_ID_MPEG1VIDEO
@ AV_CODEC_ID_MPEG1VIDEO
Definition: codec_id.h:53
MpegEncContext::idsp
IDCTDSPContext idsp
Definition: mpegvideo.h:217
ff_mb_ptype_vlc
VLC ff_mb_ptype_vlc
Definition: mpeg12.c:124
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:28
startcode.h
s2
#define s2
Definition: regdef.h:39
AVDISCARD_NONKEY
@ AVDISCARD_NONKEY
discard all frames except keyframes
Definition: defs.h:218
check_marker
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: mpegvideodec.h:73
AVCodecContext::flags2
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:528
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:442
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1617
AV_CODEC_CAP_DR1
#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_FLAG_GRAY
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:318
AVPacket::size
int size
Definition: packet.h:492
dc
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled top and top right vectors is used as motion vector prediction the used motion vector is the sum of the predictor and(mvx_diff, mvy_diff) *mv_scale Intra DC Prediction block[y][x] dc[1]
Definition: snow.txt:400
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:106
MpegEncContext::qscale
int qscale
QP.
Definition: mpegvideo.h:194
AV_CODEC_ID_IPU
@ AV_CODEC_ID_IPU
Definition: codec_id.h:309
AV_FRAME_DATA_PANSCAN
@ AV_FRAME_DATA_PANSCAN
The data is the AVPanScan struct defined in libavcodec.
Definition: frame.h:53
RL_VLC_ELEM
Definition: vlc.h:50
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:361
MT_FRAME
#define MT_FRAME
Definition: mpeg12dec.c:656
codec_internal.h
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:87
shift
static int shift(int a, int b)
Definition: bonk.c:262
IPUContext::flags
int flags
Definition: mpeg12dec.c:2924
MpegEncContext::intra_matrix
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:295
ff_mpeg1_clean_buffers
void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:106
ff_mpeg1video_decoder
const FFCodec ff_mpeg1video_decoder
Definition: mpeg12dec.c:2834
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
#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: codec_internal.h:54
AVFrameSideData::data
uint8_t * data
Definition: frame.h:248
MB_TYPE_SKIP
#define MB_TYPE_SKIP
Definition: mpegutils.h:55
FF_THREAD_SLICE
#define FF_THREAD_SLICE
Decode more than one part of a single frame at once.
Definition: avcodec.h:1544
ff_mpeg_draw_horiz_band
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo_dec.c:541
PICTURE_START_CODE
#define PICTURE_START_CODE
Definition: mpeg12.h:31
USER_START_CODE
#define USER_START_CODE
Definition: cavs.h:40
AVCodecContext::skip_bottom
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:967
AVCodecHWConfigInternal
Definition: hwconfig.h:25
ff_mpeg1_default_intra_matrix
const uint16_t ff_mpeg1_default_intra_matrix[256]
Definition: mpeg12data.c:31
diff
static av_always_inline int diff(const struct color_info *a, const struct color_info *b, const int trans_thresh)
Definition: vf_paletteuse.c:164
ff_mpv_frame_start
int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
generic function called after decoding the header and before a frame is decoded.
Definition: mpegvideo_dec.c:295
MB_TYPE_INTERLACED
#define MB_TYPE_INTERLACED
Definition: mpegutils.h:51
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:177
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo_dec.c:549
height
#define height
Mpeg1Context::has_stereo3d
int has_stereo3d
Definition: mpeg12dec.c:71
mpeg_decode_init
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
Definition: mpeg12dec.c:1050
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: codec.h:114
HWACCEL_D3D11VA
#define HWACCEL_D3D11VA(codec)
Definition: hwconfig.h:78
mpegvideodata.h
attributes.h
ff_mpeg1_decode_block_intra
int ff_mpeg1_decode_block_intra(GetBitContext *gb, const uint16_t *quant_matrix, const uint8_t *scantable, int last_dc[3], int16_t *block, int index, int qscale)
Definition: mpeg12.c:172
MV_TYPE_FIELD
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:264
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:413
AV_PIX_FMT_D3D11
@ AV_PIX_FMT_D3D11
Hardware surfaces for Direct3D11.
Definition: pixfmt.h:333
HWACCEL_NVDEC
#define HWACCEL_NVDEC(codec)
Definition: hwconfig.h:68
AV_PIX_FMT_VAAPI
@ AV_PIX_FMT_VAAPI
Hardware acceleration through VA-API, data[3] contains a VASurfaceID.
Definition: pixfmt.h:119
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1543
ff_mpeg2_video_profiles
const AVProfile ff_mpeg2_video_profiles[]
Definition: profiles.c:113
AV_PIX_FMT_VDPAU
@ AV_PIX_FMT_VDPAU
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:187
emms.h
MB_TYPE_L0L1
#define MB_TYPE_L0L1
Definition: mpegutils.h:62
AV_PIX_FMT_VIDEOTOOLBOX
@ AV_PIX_FMT_VIDEOTOOLBOX
hardware decoding through Videotoolbox
Definition: pixfmt.h:302
ff_init_scantable
av_cold void ff_init_scantable(const uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: mpegvideo.c:321
MpegEncContext::block_last_index
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:72
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:67
MpegEncContext::chroma_inter_matrix
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:298
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
AV_CODEC_FLAG2_SHOW_ALL
#define AV_CODEC_FLAG2_SHOW_ALL
Show all frames before the first keyframe.
Definition: avcodec.h:376
AVCodecContext::properties
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:1904
ff_alternate_vertical_scan
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:63
btype2mb_type
static const uint32_t btype2mb_type[11]
Definition: mpeg12dec.c:101
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:542
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:371
internal.h
ff_mpv_decode_init
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Initialize the given MpegEncContext for decoding.
Definition: mpegvideo_dec.c:45
AV_STEREO3D_TOPBOTTOM
@ AV_STEREO3D_TOPBOTTOM
Views are on top of each other.
Definition: stereo3d.h:76
IS_QUANT
#define IS_QUANT(a)
Definition: mpegutils.h:88
ff_mpeg12_init_vlcs
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:164
FF_DEBUG_STARTCODE
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:1396
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
MB_PAT_VLC_BITS
#define MB_PAT_VLC_BITS
Definition: mpeg12vlc.h:38
mpeg1_decode_block_inter
static int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:152
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:622
ptype2mb_type
static const uint32_t ptype2mb_type[7]
Definition: mpeg12dec.c:91
IPUContext::m
MpegEncContext m
Definition: mpeg12dec.c:2922
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
MpegEncContext::intra_vlc_format
int intra_vlc_format
Definition: mpegvideo.h:444
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1046
MAX_INDEX
#define MAX_INDEX
Definition: mpeg12dec.c:142
AVCodecContext::height
int height
Definition: avcodec.h:621
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:658
AVCOL_RANGE_MPEG
@ AVCOL_RANGE_MPEG
Narrow or limited range content.
Definition: pixfmt.h:656
HWACCEL_VIDEOTOOLBOX
#define HWACCEL_VIDEOTOOLBOX(codec)
Definition: hwconfig.h:74
Mpeg1Context::stereo3d
AVStereo3D stereo3d
Definition: mpeg12dec.c:70
idctdsp.h
avcodec.h
av_cmp_q
static int av_cmp_q(AVRational a, AVRational b)
Compare two rationals.
Definition: rational.h:89
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:606
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
ff_mpeg12_frame_rate_tab
const AVRational ff_mpeg12_frame_rate_tab[]
Definition: mpeg12framerate.c:24
mpeg_decode_gop
static int mpeg_decode_gop(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2375
ret
ret
Definition: filter_design.txt:187
AV_EF_AGGRESSIVE
#define AV_EF_AGGRESSIVE
consider things that a sane encoder/muxer should not do as an error
Definition: defs.h:56
pred
static const float pred[4]
Definition: siprdata.h:259
AV_FRAME_DATA_GOP_TIMECODE
@ AV_FRAME_DATA_GOP_TIMECODE
The GOP timecode in 25 bit timecode format.
Definition: frame.h:125
ff_mpeg1_default_non_intra_matrix
const uint16_t ff_mpeg1_default_non_intra_matrix[64]
Definition: mpeg12data.c:42
mpeg1_fast_decode_block_inter
static int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
Changing this would eat up any speed benefits it has.
Definition: mpeg12dec.c:240
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:561
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dvdec.c:147
ff_thread_finish_setup
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call ff_thread_finish_setup() afterwards. If some code can 't be moved
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
mpeg_get_pixelformat
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
Definition: mpeg12dec.c:1138
AV_CODEC_FLAG2_CHUNKS
#define AV_CODEC_FLAG2_CHUNKS
Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
Definition: avcodec.h:367
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
mpeg12data.h
mpeg2_fast_decode_block_non_intra
static int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
Changing this would eat up any speed benefits it has.
Definition: mpeg12dec.c:413
mpeg_field_start
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:1538
ff_mpeg_update_thread_context
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo_dec.c:62
skip_1stop_8data_bits
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:699
AVCodecContext
main external API structure.
Definition: avcodec.h:441
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1551
av_timecode_make_mpeg_tc_string
char * av_timecode_make_mpeg_tc_string(char *buf, uint32_t tc25bit)
Get the timecode string from the 25-bit timecode format (MPEG GOP format).
Definition: timecode.c:167
MpegEncContext::intra_dc_precision
int intra_dc_precision
Definition: mpegvideo.h:438
AVCodecContext::execute
int(* execute)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size)
The codec may call this to execute several independent things.
Definition: avcodec.h:1562
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:259
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:281
mpeg12dec.h
AVCHROMA_LOC_CENTER
@ AVCHROMA_LOC_CENTER
MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0.
Definition: pixfmt.h:695
AVRational::den
int den
Denominator.
Definition: rational.h:60
error_resilience.h
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
FF_HW_CALL
#define FF_HW_CALL(avctx, function,...)
Definition: hwaccel_internal.h:171
AVCodecContext::profile
int profile
profile
Definition: avcodec.h:1596
AVFrame::metadata
AVDictionary * metadata
metadata.
Definition: frame.h:708
ff_mb_btype_vlc
VLC ff_mb_btype_vlc
Definition: mpeg12.c:125
sign_extend
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:133
ff_mpv_frame_end
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo_dec.c:496
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:112
Mpeg1Context::slice_count
int slice_count
Definition: mpeg12dec.c:75
AVCodecContext::ticks_per_frame
attribute_deprecated int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:579
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:76
VLC::table
VLCElem * table
Definition: vlc.h:35
FF_CODEC_PROPERTY_CLOSED_CAPTIONS
#define FF_CODEC_PROPERTY_CLOSED_CAPTIONS
Definition: avcodec.h:1906
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
av_buffer_realloc
int av_buffer_realloc(AVBufferRef **pbuf, size_t size)
Reallocate a given buffer.
Definition: buffer.c:183
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:1388
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:636
get_dmv
static int get_dmv(MpegEncContext *s)
Definition: mpeg12dec.c:646
tc
#define tc
Definition: regdef.h:69
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:280
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mpeg_decode_end
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
Definition: mpeg12dec.c:2824
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
MpegEncContext::inter_scantable
ScanTable inter_scantable
if inter == intra then intra should be used to reduce the cache usage
Definition: mpegvideo.h:76
IDCTDSPContext::idct_permutation
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:88
ff_ipu_decoder
const FFCodec ff_ipu_decoder
Definition: mpeg12dec.c:3068
av_stereo3d_create_side_data
AVStereo3D * av_stereo3d_create_side_data(AVFrame *frame)
Allocate a complete AVFrameSideData and add it to the frame.
Definition: stereo3d.c:34
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:246
ER_MV_END
#define ER_MV_END
Definition: error_resilience.h:35
ff_mv_vlc
VLC ff_mv_vlc
Definition: mpeg12.c:118
MpegEncContext::q_scale_type
int q_scale_type
Definition: mpegvideo.h:442
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:466
Mpeg1Context::mpeg_enc_ctx
MpegEncContext mpeg_enc_ctx
Definition: mpeg12dec.c:66
ff_tlog
#define ff_tlog(ctx,...)
Definition: internal.h:153
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:257
AVPacket
This structure stores compressed data.
Definition: packet.h:468
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:468
ScanTable::permutated
uint8_t permutated[64]
Definition: mpegvideo.h:60
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:88
mpeg_get_qscale
static int mpeg_get_qscale(MpegEncContext *s)
Definition: mpegvideodec.h:64
mpeg_decode_sequence_extension
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1339
HWACCEL_VAAPI
#define HWACCEL_VAAPI(codec)
Definition: hwconfig.h:70
mpeg_er.h
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:621
int32_t
int32_t
Definition: audioconvert.c:56
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:385
AV_CODEC_CAP_DRAW_HORIZ_BAND
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: codec.h:44
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
Mpeg1Context::frame_rate_ext
AVRational frame_rate_ext
Definition: mpeg12dec.c:79
mpeg_decode_motion
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
Definition: mpeg12dec.c:116
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
IPUContext::block
int16_t block[6][64]
Definition: mpeg12dec.c:2925
mpeg_decode_user_data
static void mpeg_decode_user_data(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2305
h
h
Definition: vp9dsp_template.c:2038
MpegEncContext::end_mb_y
int end_mb_y
end mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
Definition: mpegvideo.h:143
ER_AC_END
#define ER_AC_END
Definition: error_resilience.h:33
AVStereo3D
Stereo 3D type: this structure describes how two videos are packed within a single video surface,...
Definition: stereo3d.h:173
av_image_check_sar
int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
Check if the given sample aspect ratio of an image is valid.
Definition: imgutils.c:323
MV_VLC_BITS
#define MV_VLC_BITS
Definition: mpeg12vlc.h:34
Mpeg1Context::timecode_frame_start
int64_t timecode_frame_start
Definition: mpeg12dec.c:86
MpegEncContext::start_mb_y
int start_mb_y
start mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
Definition: mpegvideo.h:142
AVDISCARD_NONREF
@ AVDISCARD_NONREF
discard all non reference
Definition: defs.h:215
MpegEncContext::alternate_scan
int alternate_scan
Definition: mpegvideo.h:445
DECODE_SLICE_OK
#define DECODE_SLICE_OK
Definition: mpeg12dec.c:1642
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:54
DECODE_SLICE_ERROR
#define DECODE_SLICE_ERROR
Definition: mpeg12dec.c:1641
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:67
load_matrix
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
Definition: mpeg12dec.c:1440
AVCodecContext::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel.
Definition: avcodec.h:822
decode_dc
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12dec.h:28
Mpeg1Context::afd
uint8_t afd
Definition: mpeg12dec.c:73
Mpeg1Context
Definition: mpeg12dec.c:65
MpegEncContext::chroma_intra_matrix
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:296
mpeg_decode_picture_coding_extension
static int mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1477
Mpeg1Context::extradata_decoded
int extradata_decoded
Definition: mpeg12dec.c:85
mpeg2_decode_block_non_intra
static int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:324
MB_TYPE_INTRA
#define MB_TYPE_INTRA
Definition: mpegutils.h:66
MBINCR_VLC_BITS
#define MBINCR_VLC_BITS
Definition: mpeg12vlc.h:37
mpeg_decode_slice
static int mpeg_decode_slice(MpegEncContext *s, int mb_y, const uint8_t **buf, int buf_size)
Decode a slice.
Definition: mpeg12dec.c:1650
rl_vlc
static VLC rl_vlc[2]
Definition: mobiclip.c:277
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