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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 #define UNCHECKED_BITSTREAM_READER 1
29 #include <inttypes.h>
30 
31 #include "libavutil/attributes.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/stereo3d.h"
35 
36 #include "avcodec.h"
37 #include "bytestream.h"
38 #include "error_resilience.h"
39 #include "hwaccel.h"
40 #include "idctdsp.h"
41 #include "internal.h"
42 #include "mpeg_er.h"
43 #include "mpeg12.h"
44 #include "mpeg12data.h"
45 #include "mpegutils.h"
46 #include "mpegvideo.h"
47 #include "mpegvideodata.h"
48 #include "profiles.h"
49 #include "thread.h"
50 #include "version.h"
51 #include "xvmc_internal.h"
52 
53 typedef struct Mpeg1Context {
54  MpegEncContext mpeg_enc_ctx;
55  int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
56  int repeat_field; /* true if we must repeat the field */
57  AVPanScan pan_scan; /* some temporary storage for the panscan */
58  AVStereo3D stereo3d;
59  int has_stereo3d;
60  uint8_t *a53_caption;
61  int a53_caption_size;
62  uint8_t afd;
63  int has_afd;
64  int slice_count;
65  AVRational save_aspect;
66  int save_width, save_height, save_progressive_seq;
67  AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
68  int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
69  int tmpgexs;
70  int first_slice;
71  int extradata_decoded;
72 } Mpeg1Context;
73 
74 #define MB_TYPE_ZERO_MV 0x20000000
75 
76 static const uint32_t ptype2mb_type[7] = {
77  MB_TYPE_INTRA,
78  MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
79  MB_TYPE_L0,
80  MB_TYPE_L0 | MB_TYPE_CBP,
81  MB_TYPE_QUANT | MB_TYPE_INTRA,
82  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
83  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
84 };
85 
86 static const uint32_t btype2mb_type[11] = {
87  MB_TYPE_INTRA,
88  MB_TYPE_L1,
89  MB_TYPE_L1 | MB_TYPE_CBP,
90  MB_TYPE_L0,
91  MB_TYPE_L0 | MB_TYPE_CBP,
92  MB_TYPE_L0L1,
93  MB_TYPE_L0L1 | MB_TYPE_CBP,
94  MB_TYPE_QUANT | MB_TYPE_INTRA,
95  MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
96  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
97  MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
98 };
99 
100 /* as H.263, but only 17 codes */
101 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
102 {
103  int code, sign, val, shift;
104 
105  code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
106  if (code == 0)
107  return pred;
108  if (code < 0)
109  return 0xffff;
110 
111  sign = get_bits1(&s->gb);
112  shift = fcode - 1;
113  val = code;
114  if (shift) {
115  val = (val - 1) << shift;
116  val |= get_bits(&s->gb, shift);
117  val++;
118  }
119  if (sign)
120  val = -val;
121  val += pred;
122 
123  /* modulo decoding */
124  return sign_extend(val, 5 + shift);
125 }
126 
127 #define MAX_INDEX (64 - 1)
128 #define check_scantable_index(ctx, x) \
129  do { \
130  if ((x) > MAX_INDEX) { \
131  av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
132  ctx->mb_x, ctx->mb_y); \
133  return AVERROR_INVALIDDATA; \
134  } \
135  } while (0)
136 
137 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
138  int16_t *block, int n)
139 {
140  int level, i, j, run;
141  RLTable *rl = &ff_rl_mpeg1;
142  uint8_t *const scantable = s->intra_scantable.permutated;
143  const uint16_t *quant_matrix = s->inter_matrix;
144  const int qscale = s->qscale;
145 
146  {
147  OPEN_READER(re, &s->gb);
148  i = -1;
149  // special case for first coefficient, no need to add second VLC table
150  UPDATE_CACHE(re, &s->gb);
151  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
152  level = (3 * qscale * quant_matrix[0]) >> 5;
153  level = (level - 1) | 1;
154  if (GET_CACHE(re, &s->gb) & 0x40000000)
155  level = -level;
156  block[0] = level;
157  i++;
158  SKIP_BITS(re, &s->gb, 2);
159  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
160  goto end;
161  }
162  /* now quantify & encode AC coefficients */
163  for (;;) {
164  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
165  TEX_VLC_BITS, 2, 0);
166 
167  if (level != 0) {
168  i += run;
169  if (i > MAX_INDEX)
170  break;
171  j = scantable[i];
172  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
173  level = (level - 1) | 1;
174  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
175  SHOW_SBITS(re, &s->gb, 1);
176  SKIP_BITS(re, &s->gb, 1);
177  } else {
178  /* escape */
179  run = SHOW_UBITS(re, &s->gb, 6) + 1;
180  LAST_SKIP_BITS(re, &s->gb, 6);
181  UPDATE_CACHE(re, &s->gb);
182  level = SHOW_SBITS(re, &s->gb, 8);
183  SKIP_BITS(re, &s->gb, 8);
184  if (level == -128) {
185  level = SHOW_UBITS(re, &s->gb, 8) - 256;
186  SKIP_BITS(re, &s->gb, 8);
187  } else if (level == 0) {
188  level = SHOW_UBITS(re, &s->gb, 8);
189  SKIP_BITS(re, &s->gb, 8);
190  }
191  i += run;
192  if (i > MAX_INDEX)
193  break;
194  j = scantable[i];
195  if (level < 0) {
196  level = -level;
197  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
198  level = (level - 1) | 1;
199  level = -level;
200  } else {
201  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
202  level = (level - 1) | 1;
203  }
204  }
205 
206  block[j] = level;
207  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
208  break;
209  UPDATE_CACHE(re, &s->gb);
210  }
211 end:
212  LAST_SKIP_BITS(re, &s->gb, 2);
213  CLOSE_READER(re, &s->gb);
214  }
215 
216  check_scantable_index(s, i);
217 
218  s->block_last_index[n] = i;
219  return 0;
220 }
221 
222 /**
223  * Note: this function can read out of range and crash for corrupt streams.
224  * Changing this would eat up any speed benefits it has.
225  * Do not use "fast" flag if you need the code to be robust.
226  */
227 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
228  int16_t *block, int n)
229 {
230  int level, i, j, run;
231  RLTable *rl = &ff_rl_mpeg1;
232  uint8_t *const scantable = s->intra_scantable.permutated;
233  const int qscale = s->qscale;
234 
235  {
236  OPEN_READER(re, &s->gb);
237  i = -1;
238  // Special case for first coefficient, no need to add second VLC table.
239  UPDATE_CACHE(re, &s->gb);
240  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
241  level = (3 * qscale) >> 1;
242  level = (level - 1) | 1;
243  if (GET_CACHE(re, &s->gb) & 0x40000000)
244  level = -level;
245  block[0] = level;
246  i++;
247  SKIP_BITS(re, &s->gb, 2);
248  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
249  goto end;
250  }
251 
252  /* now quantify & encode AC coefficients */
253  for (;;) {
254  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
255  TEX_VLC_BITS, 2, 0);
256 
257  if (level != 0) {
258  i += run;
259  if (i > MAX_INDEX)
260  break;
261  j = scantable[i];
262  level = ((level * 2 + 1) * qscale) >> 1;
263  level = (level - 1) | 1;
264  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265  SHOW_SBITS(re, &s->gb, 1);
266  SKIP_BITS(re, &s->gb, 1);
267  } else {
268  /* escape */
269  run = SHOW_UBITS(re, &s->gb, 6) + 1;
270  LAST_SKIP_BITS(re, &s->gb, 6);
271  UPDATE_CACHE(re, &s->gb);
272  level = SHOW_SBITS(re, &s->gb, 8);
273  SKIP_BITS(re, &s->gb, 8);
274  if (level == -128) {
275  level = SHOW_UBITS(re, &s->gb, 8) - 256;
276  SKIP_BITS(re, &s->gb, 8);
277  } else if (level == 0) {
278  level = SHOW_UBITS(re, &s->gb, 8);
279  SKIP_BITS(re, &s->gb, 8);
280  }
281  i += run;
282  if (i > MAX_INDEX)
283  break;
284  j = scantable[i];
285  if (level < 0) {
286  level = -level;
287  level = ((level * 2 + 1) * qscale) >> 1;
288  level = (level - 1) | 1;
289  level = -level;
290  } else {
291  level = ((level * 2 + 1) * qscale) >> 1;
292  level = (level - 1) | 1;
293  }
294  }
295 
296  block[j] = level;
297  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298  break;
299  UPDATE_CACHE(re, &s->gb);
300  }
301 end:
302  LAST_SKIP_BITS(re, &s->gb, 2);
303  CLOSE_READER(re, &s->gb);
304  }
305 
306  check_scantable_index(s, i);
307 
308  s->block_last_index[n] = i;
309  return 0;
310 }
311 
312 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
313  int16_t *block, int n)
314 {
315  int level, i, j, run;
316  RLTable *rl = &ff_rl_mpeg1;
317  uint8_t *const scantable = s->intra_scantable.permutated;
318  const uint16_t *quant_matrix;
319  const int qscale = s->qscale;
320  int mismatch;
321 
322  mismatch = 1;
323 
324  {
325  OPEN_READER(re, &s->gb);
326  i = -1;
327  if (n < 4)
328  quant_matrix = s->inter_matrix;
329  else
330  quant_matrix = s->chroma_inter_matrix;
331 
332  // Special case for first coefficient, no need to add second VLC table.
333  UPDATE_CACHE(re, &s->gb);
334  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
335  level = (3 * qscale * quant_matrix[0]) >> 5;
336  if (GET_CACHE(re, &s->gb) & 0x40000000)
337  level = -level;
338  block[0] = level;
339  mismatch ^= level;
340  i++;
341  SKIP_BITS(re, &s->gb, 2);
342  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
343  goto end;
344  }
345 
346  /* now quantify & encode AC coefficients */
347  for (;;) {
348  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
349  TEX_VLC_BITS, 2, 0);
350 
351  if (level != 0) {
352  i += run;
353  if (i > MAX_INDEX)
354  break;
355  j = scantable[i];
356  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
357  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
358  SHOW_SBITS(re, &s->gb, 1);
359  SKIP_BITS(re, &s->gb, 1);
360  } else {
361  /* escape */
362  run = SHOW_UBITS(re, &s->gb, 6) + 1;
363  LAST_SKIP_BITS(re, &s->gb, 6);
364  UPDATE_CACHE(re, &s->gb);
365  level = SHOW_SBITS(re, &s->gb, 12);
366  SKIP_BITS(re, &s->gb, 12);
367 
368  i += run;
369  if (i > MAX_INDEX)
370  break;
371  j = scantable[i];
372  if (level < 0) {
373  level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
374  level = -level;
375  } else {
376  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
377  }
378  }
379 
380  mismatch ^= level;
381  block[j] = level;
382  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383  break;
384  UPDATE_CACHE(re, &s->gb);
385  }
386 end:
387  LAST_SKIP_BITS(re, &s->gb, 2);
388  CLOSE_READER(re, &s->gb);
389  }
390  block[63] ^= (mismatch & 1);
391 
392  check_scantable_index(s, i);
393 
394  s->block_last_index[n] = i;
395  return 0;
396 }
397 
398 /**
399  * Note: this function can read out of range and crash for corrupt streams.
400  * Changing this would eat up any speed benefits it has.
401  * Do not use "fast" flag if you need the code to be robust.
402  */
403 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
404  int16_t *block, int n)
405 {
406  int level, i, j, run;
407  RLTable *rl = &ff_rl_mpeg1;
408  uint8_t *const scantable = s->intra_scantable.permutated;
409  const int qscale = s->qscale;
410  OPEN_READER(re, &s->gb);
411  i = -1;
412 
413  // special case for first coefficient, no need to add second VLC table
414  UPDATE_CACHE(re, &s->gb);
415  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416  level = (3 * qscale) >> 1;
417  if (GET_CACHE(re, &s->gb) & 0x40000000)
418  level = -level;
419  block[0] = level;
420  i++;
421  SKIP_BITS(re, &s->gb, 2);
422  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
423  goto end;
424  }
425 
426  /* now quantify & encode AC coefficients */
427  for (;;) {
428  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
429 
430  if (level != 0) {
431  i += run;
432  if (i > MAX_INDEX)
433  break;
434  j = scantable[i];
435  level = ((level * 2 + 1) * qscale) >> 1;
436  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
437  SHOW_SBITS(re, &s->gb, 1);
438  SKIP_BITS(re, &s->gb, 1);
439  } else {
440  /* escape */
441  run = SHOW_UBITS(re, &s->gb, 6) + 1;
442  LAST_SKIP_BITS(re, &s->gb, 6);
443  UPDATE_CACHE(re, &s->gb);
444  level = SHOW_SBITS(re, &s->gb, 12);
445  SKIP_BITS(re, &s->gb, 12);
446 
447  i += run;
448  if (i > MAX_INDEX)
449  break;
450  j = scantable[i];
451  if (level < 0) {
452  level = ((-level * 2 + 1) * qscale) >> 1;
453  level = -level;
454  } else {
455  level = ((level * 2 + 1) * qscale) >> 1;
456  }
457  }
458 
459  block[j] = level;
460  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
461  break;
462 
463  UPDATE_CACHE(re, &s->gb);
464  }
465 end:
466  LAST_SKIP_BITS(re, &s->gb, 2);
467  CLOSE_READER(re, &s->gb);
468 
469  check_scantable_index(s, i);
470 
471  s->block_last_index[n] = i;
472  return 0;
473 }
474 
475 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
476  int16_t *block, int n)
477 {
478  int level, dc, diff, i, j, run;
479  int component;
480  RLTable *rl;
481  uint8_t *const scantable = s->intra_scantable.permutated;
482  const uint16_t *quant_matrix;
483  const int qscale = s->qscale;
484  int mismatch;
485 
486  /* DC coefficient */
487  if (n < 4) {
488  quant_matrix = s->intra_matrix;
489  component = 0;
490  } else {
491  quant_matrix = s->chroma_intra_matrix;
492  component = (n & 1) + 1;
493  }
494  diff = decode_dc(&s->gb, component);
495  if (diff >= 0xffff)
496  return AVERROR_INVALIDDATA;
497  dc = s->last_dc[component];
498  dc += diff;
499  s->last_dc[component] = dc;
500  block[0] = dc * (1 << (3 - s->intra_dc_precision));
501  ff_tlog(s->avctx, "dc=%d\n", block[0]);
502  mismatch = block[0] ^ 1;
503  i = 0;
504  if (s->intra_vlc_format)
505  rl = &ff_rl_mpeg2;
506  else
507  rl = &ff_rl_mpeg1;
508 
509  {
510  OPEN_READER(re, &s->gb);
511  /* now quantify & encode AC coefficients */
512  for (;;) {
513  UPDATE_CACHE(re, &s->gb);
514  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
515  TEX_VLC_BITS, 2, 0);
516 
517  if (level == 127) {
518  break;
519  } else if (level != 0) {
520  i += run;
521  if (i > MAX_INDEX)
522  break;
523  j = scantable[i];
524  level = (level * qscale * quant_matrix[j]) >> 4;
525  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
526  SHOW_SBITS(re, &s->gb, 1);
527  LAST_SKIP_BITS(re, &s->gb, 1);
528  } else {
529  /* escape */
530  run = SHOW_UBITS(re, &s->gb, 6) + 1;
531  LAST_SKIP_BITS(re, &s->gb, 6);
532  UPDATE_CACHE(re, &s->gb);
533  level = SHOW_SBITS(re, &s->gb, 12);
534  SKIP_BITS(re, &s->gb, 12);
535  i += run;
536  if (i > MAX_INDEX)
537  break;
538  j = scantable[i];
539  if (level < 0) {
540  level = (-level * qscale * quant_matrix[j]) >> 4;
541  level = -level;
542  } else {
543  level = (level * qscale * quant_matrix[j]) >> 4;
544  }
545  }
546 
547  mismatch ^= level;
548  block[j] = level;
549  }
550  CLOSE_READER(re, &s->gb);
551  }
552  block[63] ^= mismatch & 1;
553 
554  check_scantable_index(s, i);
555 
556  s->block_last_index[n] = i;
557  return 0;
558 }
559 
560 /**
561  * Note: this function can read out of range and crash for corrupt streams.
562  * Changing this would eat up any speed benefits it has.
563  * Do not use "fast" flag if you need the code to be robust.
564  */
565 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
566  int16_t *block, int n)
567 {
568  int level, dc, diff, i, j, run;
569  int component;
570  RLTable *rl;
571  uint8_t *const scantable = s->intra_scantable.permutated;
572  const uint16_t *quant_matrix;
573  const int qscale = s->qscale;
574 
575  /* DC coefficient */
576  if (n < 4) {
577  quant_matrix = s->intra_matrix;
578  component = 0;
579  } else {
580  quant_matrix = s->chroma_intra_matrix;
581  component = (n & 1) + 1;
582  }
583  diff = decode_dc(&s->gb, component);
584  if (diff >= 0xffff)
585  return AVERROR_INVALIDDATA;
586  dc = s->last_dc[component];
587  dc += diff;
588  s->last_dc[component] = dc;
589  block[0] = dc << (3 - s->intra_dc_precision);
590  i = 0;
591  if (s->intra_vlc_format)
592  rl = &ff_rl_mpeg2;
593  else
594  rl = &ff_rl_mpeg1;
595 
596  {
597  OPEN_READER(re, &s->gb);
598  /* now quantify & encode AC coefficients */
599  for (;;) {
600  UPDATE_CACHE(re, &s->gb);
601  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
602  TEX_VLC_BITS, 2, 0);
603 
604  if (level >= 64 || i > 63) {
605  break;
606  } else if (level != 0) {
607  i += run;
608  j = scantable[i];
609  level = (level * qscale * quant_matrix[j]) >> 4;
610  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
611  SHOW_SBITS(re, &s->gb, 1);
612  LAST_SKIP_BITS(re, &s->gb, 1);
613  } else {
614  /* escape */
615  run = SHOW_UBITS(re, &s->gb, 6) + 1;
616  LAST_SKIP_BITS(re, &s->gb, 6);
617  UPDATE_CACHE(re, &s->gb);
618  level = SHOW_SBITS(re, &s->gb, 12);
619  SKIP_BITS(re, &s->gb, 12);
620  i += run;
621  j = scantable[i];
622  if (level < 0) {
623  level = (-level * qscale * quant_matrix[j]) >> 4;
624  level = -level;
625  } else {
626  level = (level * qscale * quant_matrix[j]) >> 4;
627  }
628  }
629 
630  block[j] = level;
631  }
632  CLOSE_READER(re, &s->gb);
633  }
634 
635  check_scantable_index(s, i);
636 
637  s->block_last_index[n] = i;
638  return 0;
639 }
640 
641 /******************************************/
642 /* decoding */
643 
644 static inline int get_dmv(MpegEncContext *s)
645 {
646  if (get_bits1(&s->gb))
647  return 1 - (get_bits1(&s->gb) << 1);
648  else
649  return 0;
650 }
651 
652 /* motion type (for MPEG-2) */
653 #define MT_FIELD 1
654 #define MT_FRAME 2
655 #define MT_16X8 2
656 #define MT_DMV 3
657 
658 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
659 {
660  int i, j, k, cbp, val, mb_type, motion_type;
661  const int mb_block_count = 4 + (1 << s->chroma_format);
662  int ret;
663 
664  ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
665 
666  av_assert2(s->mb_skipped == 0);
667 
668  if (s->mb_skip_run-- != 0) {
669  if (s->pict_type == AV_PICTURE_TYPE_P) {
670  s->mb_skipped = 1;
671  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
672  MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
673  } else {
674  int mb_type;
675 
676  if (s->mb_x)
677  mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
678  else
679  // FIXME not sure if this is allowed in MPEG at all
680  mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
681  if (IS_INTRA(mb_type)) {
682  av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
683  return AVERROR_INVALIDDATA;
684  }
685  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
686  mb_type | MB_TYPE_SKIP;
687 
688  if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
689  s->mb_skipped = 1;
690  }
691 
692  return 0;
693  }
694 
695  switch (s->pict_type) {
696  default:
697  case AV_PICTURE_TYPE_I:
698  if (get_bits1(&s->gb) == 0) {
699  if (get_bits1(&s->gb) == 0) {
700  av_log(s->avctx, AV_LOG_ERROR,
701  "Invalid mb type in I-frame at %d %d\n",
702  s->mb_x, s->mb_y);
703  return AVERROR_INVALIDDATA;
704  }
705  mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
706  } else {
707  mb_type = MB_TYPE_INTRA;
708  }
709  break;
710  case AV_PICTURE_TYPE_P:
711  mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
712  if (mb_type < 0) {
713  av_log(s->avctx, AV_LOG_ERROR,
714  "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
715  return AVERROR_INVALIDDATA;
716  }
717  mb_type = ptype2mb_type[mb_type];
718  break;
719  case AV_PICTURE_TYPE_B:
720  mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
721  if (mb_type < 0) {
722  av_log(s->avctx, AV_LOG_ERROR,
723  "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
724  return AVERROR_INVALIDDATA;
725  }
726  mb_type = btype2mb_type[mb_type];
727  break;
728  }
729  ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
730 // motion_type = 0; /* avoid warning */
731  if (IS_INTRA(mb_type)) {
732  s->bdsp.clear_blocks(s->block[0]);
733 
734  if (!s->chroma_y_shift)
735  s->bdsp.clear_blocks(s->block[6]);
736 
737  /* compute DCT type */
738  // FIXME: add an interlaced_dct coded var?
739  if (s->picture_structure == PICT_FRAME &&
740  !s->frame_pred_frame_dct)
741  s->interlaced_dct = get_bits1(&s->gb);
742 
743  if (IS_QUANT(mb_type))
744  s->qscale = mpeg_get_qscale(s);
745 
746  if (s->concealment_motion_vectors) {
747  /* just parse them */
748  if (s->picture_structure != PICT_FRAME)
749  skip_bits1(&s->gb); /* field select */
750 
751  s->mv[0][0][0] =
752  s->last_mv[0][0][0] =
753  s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
754  s->last_mv[0][0][0]);
755  s->mv[0][0][1] =
756  s->last_mv[0][0][1] =
757  s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
758  s->last_mv[0][0][1]);
759 
760  check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
761  } else {
762  /* reset mv prediction */
763  memset(s->last_mv, 0, sizeof(s->last_mv));
764  }
765  s->mb_intra = 1;
766  // if 1, we memcpy blocks in xvmcvideo
767  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
768  ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
769 
770  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
771  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
772  for (i = 0; i < 6; i++)
773  mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
774  } else {
775  for (i = 0; i < mb_block_count; i++)
776  if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
777  return ret;
778  }
779  } else {
780  for (i = 0; i < 6; i++) {
781  ret = ff_mpeg1_decode_block_intra(&s->gb,
782  s->intra_matrix,
783  s->intra_scantable.permutated,
784  s->last_dc, *s->pblocks[i],
785  i, s->qscale);
786  if (ret < 0) {
787  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
788  s->mb_x, s->mb_y);
789  return ret;
790  }
791 
792  s->block_last_index[i] = ret;
793  }
794  }
795  } else {
796  if (mb_type & MB_TYPE_ZERO_MV) {
797  av_assert2(mb_type & MB_TYPE_CBP);
798 
799  s->mv_dir = MV_DIR_FORWARD;
800  if (s->picture_structure == PICT_FRAME) {
801  if (s->picture_structure == PICT_FRAME
802  && !s->frame_pred_frame_dct)
803  s->interlaced_dct = get_bits1(&s->gb);
804  s->mv_type = MV_TYPE_16X16;
805  } else {
806  s->mv_type = MV_TYPE_FIELD;
807  mb_type |= MB_TYPE_INTERLACED;
808  s->field_select[0][0] = s->picture_structure - 1;
809  }
810 
811  if (IS_QUANT(mb_type))
812  s->qscale = mpeg_get_qscale(s);
813 
814  s->last_mv[0][0][0] = 0;
815  s->last_mv[0][0][1] = 0;
816  s->last_mv[0][1][0] = 0;
817  s->last_mv[0][1][1] = 0;
818  s->mv[0][0][0] = 0;
819  s->mv[0][0][1] = 0;
820  } else {
821  av_assert2(mb_type & MB_TYPE_L0L1);
822  // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
823  /* get additional motion vector type */
824  if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
825  motion_type = MT_FRAME;
826  } else {
827  motion_type = get_bits(&s->gb, 2);
828  if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
829  s->interlaced_dct = get_bits1(&s->gb);
830  }
831 
832  if (IS_QUANT(mb_type))
833  s->qscale = mpeg_get_qscale(s);
834 
835  /* motion vectors */
836  s->mv_dir = (mb_type >> 13) & 3;
837  ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
838  switch (motion_type) {
839  case MT_FRAME: /* or MT_16X8 */
840  if (s->picture_structure == PICT_FRAME) {
841  mb_type |= MB_TYPE_16x16;
842  s->mv_type = MV_TYPE_16X16;
843  for (i = 0; i < 2; i++) {
844  if (USES_LIST(mb_type, i)) {
845  /* MT_FRAME */
846  s->mv[i][0][0] =
847  s->last_mv[i][0][0] =
848  s->last_mv[i][1][0] =
849  mpeg_decode_motion(s, s->mpeg_f_code[i][0],
850  s->last_mv[i][0][0]);
851  s->mv[i][0][1] =
852  s->last_mv[i][0][1] =
853  s->last_mv[i][1][1] =
854  mpeg_decode_motion(s, s->mpeg_f_code[i][1],
855  s->last_mv[i][0][1]);
856  /* full_pel: only for MPEG-1 */
857  if (s->full_pel[i]) {
858  s->mv[i][0][0] *= 2;
859  s->mv[i][0][1] *= 2;
860  }
861  }
862  }
863  } else {
864  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
865  s->mv_type = MV_TYPE_16X8;
866  for (i = 0; i < 2; i++) {
867  if (USES_LIST(mb_type, i)) {
868  /* MT_16X8 */
869  for (j = 0; j < 2; j++) {
870  s->field_select[i][j] = get_bits1(&s->gb);
871  for (k = 0; k < 2; k++) {
872  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
873  s->last_mv[i][j][k]);
874  s->last_mv[i][j][k] = val;
875  s->mv[i][j][k] = val;
876  }
877  }
878  }
879  }
880  }
881  break;
882  case MT_FIELD:
883  s->mv_type = MV_TYPE_FIELD;
884  if (s->picture_structure == PICT_FRAME) {
885  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
886  for (i = 0; i < 2; i++) {
887  if (USES_LIST(mb_type, i)) {
888  for (j = 0; j < 2; j++) {
889  s->field_select[i][j] = get_bits1(&s->gb);
890  val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
891  s->last_mv[i][j][0]);
892  s->last_mv[i][j][0] = val;
893  s->mv[i][j][0] = val;
894  ff_tlog(s->avctx, "fmx=%d\n", val);
895  val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
896  s->last_mv[i][j][1] >> 1);
897  s->last_mv[i][j][1] = 2 * val;
898  s->mv[i][j][1] = val;
899  ff_tlog(s->avctx, "fmy=%d\n", val);
900  }
901  }
902  }
903  } else {
904  av_assert0(!s->progressive_sequence);
905  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
906  for (i = 0; i < 2; i++) {
907  if (USES_LIST(mb_type, i)) {
908  s->field_select[i][0] = get_bits1(&s->gb);
909  for (k = 0; k < 2; k++) {
910  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
911  s->last_mv[i][0][k]);
912  s->last_mv[i][0][k] = val;
913  s->last_mv[i][1][k] = val;
914  s->mv[i][0][k] = val;
915  }
916  }
917  }
918  }
919  break;
920  case MT_DMV:
921  if (s->progressive_sequence){
922  av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
923  return AVERROR_INVALIDDATA;
924  }
925  s->mv_type = MV_TYPE_DMV;
926  for (i = 0; i < 2; i++) {
927  if (USES_LIST(mb_type, i)) {
928  int dmx, dmy, mx, my, m;
929  const int my_shift = s->picture_structure == PICT_FRAME;
930 
931  mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
932  s->last_mv[i][0][0]);
933  s->last_mv[i][0][0] = mx;
934  s->last_mv[i][1][0] = mx;
935  dmx = get_dmv(s);
936  my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
937  s->last_mv[i][0][1] >> my_shift);
938  dmy = get_dmv(s);
939 
940 
941  s->last_mv[i][0][1] = my * (1 << my_shift);
942  s->last_mv[i][1][1] = my * (1 << my_shift);
943 
944  s->mv[i][0][0] = mx;
945  s->mv[i][0][1] = my;
946  s->mv[i][1][0] = mx; // not used
947  s->mv[i][1][1] = my; // not used
948 
949  if (s->picture_structure == PICT_FRAME) {
950  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
951 
952  // m = 1 + 2 * s->top_field_first;
953  m = s->top_field_first ? 1 : 3;
954 
955  /* top -> top pred */
956  s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
957  s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
958  m = 4 - m;
959  s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
960  s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
961  } else {
962  mb_type |= MB_TYPE_16x16;
963 
964  s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
965  s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
966  if (s->picture_structure == PICT_TOP_FIELD)
967  s->mv[i][2][1]--;
968  else
969  s->mv[i][2][1]++;
970  }
971  }
972  }
973  break;
974  default:
975  av_log(s->avctx, AV_LOG_ERROR,
976  "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
977  return AVERROR_INVALIDDATA;
978  }
979  }
980 
981  s->mb_intra = 0;
982  if (HAS_CBP(mb_type)) {
983  s->bdsp.clear_blocks(s->block[0]);
984 
985  cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
986  if (mb_block_count > 6) {
987  cbp *= 1 << mb_block_count - 6;
988  cbp |= get_bits(&s->gb, mb_block_count - 6);
989  s->bdsp.clear_blocks(s->block[6]);
990  }
991  if (cbp <= 0) {
992  av_log(s->avctx, AV_LOG_ERROR,
993  "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
994  return AVERROR_INVALIDDATA;
995  }
996 
997  // if 1, we memcpy blocks in xvmcvideo
998  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
999  ff_xvmc_pack_pblocks(s, cbp);
1000 
1001  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1002  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1003  for (i = 0; i < 6; i++) {
1004  if (cbp & 32)
1005  mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1006  else
1007  s->block_last_index[i] = -1;
1008  cbp += cbp;
1009  }
1010  } else {
1011  cbp <<= 12 - mb_block_count;
1012 
1013  for (i = 0; i < mb_block_count; i++) {
1014  if (cbp & (1 << 11)) {
1015  if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1016  return ret;
1017  } else {
1018  s->block_last_index[i] = -1;
1019  }
1020  cbp += cbp;
1021  }
1022  }
1023  } else {
1024  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1025  for (i = 0; i < 6; i++) {
1026  if (cbp & 32)
1027  mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1028  else
1029  s->block_last_index[i] = -1;
1030  cbp += cbp;
1031  }
1032  } else {
1033  for (i = 0; i < 6; i++) {
1034  if (cbp & 32) {
1035  if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1036  return ret;
1037  } else {
1038  s->block_last_index[i] = -1;
1039  }
1040  cbp += cbp;
1041  }
1042  }
1043  }
1044  } else {
1045  for (i = 0; i < 12; i++)
1046  s->block_last_index[i] = -1;
1047  }
1048  }
1049 
1050  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1051 
1052  return 0;
1053 }
1054 
1055 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1056 {
1057  Mpeg1Context *s = avctx->priv_data;
1058  MpegEncContext *s2 = &s->mpeg_enc_ctx;
1059 
1060  ff_mpv_decode_defaults(s2);
1061 
1062  if ( avctx->codec_tag != AV_RL32("VCR2")
1063  && avctx->codec_tag != AV_RL32("BW10"))
1064  avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1065  ff_mpv_decode_init(s2, avctx);
1066 
1067  s->mpeg_enc_ctx.avctx = avctx;
1068 
1069  /* we need some permutation to store matrices,
1070  * until the decoder sets the real permutation. */
1071  ff_mpv_idct_init(s2);
1072  ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1073  ff_mpeg12_init_vlcs();
1074 
1075  s2->chroma_format = 1;
1076  s->mpeg_enc_ctx_allocated = 0;
1077  s->mpeg_enc_ctx.picture_number = 0;
1078  s->repeat_field = 0;
1079  s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1080  avctx->color_range = AVCOL_RANGE_MPEG;
1081  return 0;
1082 }
1083 
1084 #if HAVE_THREADS
1085 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1086  const AVCodecContext *avctx_from)
1087 {
1088  Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1089  MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1090  int err;
1091 
1092  if (avctx == avctx_from ||
1093  !ctx_from->mpeg_enc_ctx_allocated ||
1094  !s1->context_initialized)
1095  return 0;
1096 
1097  err = ff_mpeg_update_thread_context(avctx, avctx_from);
1098  if (err)
1099  return err;
1100 
1101  if (!ctx->mpeg_enc_ctx_allocated)
1102  memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1103 
1104  if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1105  s->picture_number++;
1106 
1107  return 0;
1108 }
1109 #endif
1110 
1111 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1112  const uint8_t *new_perm)
1113 {
1114  uint16_t temp_matrix[64];
1115  int i;
1116 
1117  memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1118 
1119  for (i = 0; i < 64; i++)
1120  matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1121 }
1122 
1123 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1124 #if CONFIG_MPEG1_NVDEC_HWACCEL
1125  AV_PIX_FMT_CUDA,
1126 #endif
1127 #if CONFIG_MPEG1_XVMC_HWACCEL
1128  AV_PIX_FMT_XVMC,
1129 #endif
1130 #if CONFIG_MPEG1_VDPAU_HWACCEL
1131  AV_PIX_FMT_VDPAU,
1132 #endif
1133  AV_PIX_FMT_YUV420P,
1134  AV_PIX_FMT_NONE
1135 };
1136 
1137 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1138 #if CONFIG_MPEG2_NVDEC_HWACCEL
1139  AV_PIX_FMT_CUDA,
1140 #endif
1141 #if CONFIG_MPEG2_XVMC_HWACCEL
1142  AV_PIX_FMT_XVMC,
1143 #endif
1144 #if CONFIG_MPEG2_VDPAU_HWACCEL
1145  AV_PIX_FMT_VDPAU,
1146 #endif
1147 #if CONFIG_MPEG2_DXVA2_HWACCEL
1148  AV_PIX_FMT_DXVA2_VLD,
1149 #endif
1150 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1151  AV_PIX_FMT_D3D11VA_VLD,
1152  AV_PIX_FMT_D3D11,
1153 #endif
1154 #if CONFIG_MPEG2_VAAPI_HWACCEL
1155  AV_PIX_FMT_VAAPI,
1156 #endif
1157 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1158  AV_PIX_FMT_VIDEOTOOLBOX,
1159 #endif
1160  AV_PIX_FMT_YUV420P,
1161  AV_PIX_FMT_NONE
1162 };
1163 
1164 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1165  AV_PIX_FMT_YUV422P,
1166  AV_PIX_FMT_NONE
1167 };
1168 
1169 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1170  AV_PIX_FMT_YUV444P,
1171  AV_PIX_FMT_NONE
1172 };
1173 
1174 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1175 {
1176  Mpeg1Context *s1 = avctx->priv_data;
1177  MpegEncContext *s = &s1->mpeg_enc_ctx;
1178  const enum AVPixelFormat *pix_fmts;
1179 
1180  if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1181  return AV_PIX_FMT_GRAY8;
1182 
1183  if (s->chroma_format < 2)
1184  pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1185  mpeg1_hwaccel_pixfmt_list_420 :
1186  mpeg2_hwaccel_pixfmt_list_420;
1187  else if (s->chroma_format == 2)
1188  pix_fmts = mpeg12_pixfmt_list_422;
1189  else
1190  pix_fmts = mpeg12_pixfmt_list_444;
1191 
1192  return ff_thread_get_format(avctx, pix_fmts);
1193 }
1194 
1195 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1196 {
1197  // until then pix_fmt may be changed right after codec init
1198  if (avctx->hwaccel)
1199  if (avctx->idct_algo == FF_IDCT_AUTO)
1200  avctx->idct_algo = FF_IDCT_NONE;
1201 
1202  if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1203  Mpeg1Context *s1 = avctx->priv_data;
1204  MpegEncContext *s = &s1->mpeg_enc_ctx;
1205 
1206  s->pack_pblocks = 1;
1207  }
1208 }
1209 
1210 /* Call this function when we know all parameters.
1211  * It may be called in different places for MPEG-1 and MPEG-2. */
1212 static int mpeg_decode_postinit(AVCodecContext *avctx)
1213 {
1214  Mpeg1Context *s1 = avctx->priv_data;
1215  MpegEncContext *s = &s1->mpeg_enc_ctx;
1216  uint8_t old_permutation[64];
1217  int ret;
1218 
1219  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1220  // MPEG-1 aspect
1221  AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1222  avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1223  } else { // MPEG-2
1224  // MPEG-2 aspect
1225  if (s->aspect_ratio_info > 1) {
1226  AVRational dar =
1227  av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1228  (AVRational) { s1->pan_scan.width,
1229  s1->pan_scan.height }),
1230  (AVRational) { s->width, s->height });
1231 
1232  /* We ignore the spec here and guess a bit as reality does not
1233  * match the spec, see for example res_change_ffmpeg_aspect.ts
1234  * and sequence-display-aspect.mpg.
1235  * issue1613, 621, 562 */
1236  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1237  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1238  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1239  s->avctx->sample_aspect_ratio =
1240  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1241  (AVRational) { s->width, s->height });
1242  } else {
1243  s->avctx->sample_aspect_ratio =
1244  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1245  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1246 // issue1613 4/3 16/9 -> 16/9
1247 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1248 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1249 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1250  ff_dlog(avctx, "aspect A %d/%d\n",
1251  ff_mpeg2_aspect[s->aspect_ratio_info].num,
1252  ff_mpeg2_aspect[s->aspect_ratio_info].den);
1253  ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1254  s->avctx->sample_aspect_ratio.den);
1255  }
1256  } else {
1257  s->avctx->sample_aspect_ratio =
1258  ff_mpeg2_aspect[s->aspect_ratio_info];
1259  }
1260  } // MPEG-2
1261 
1262  if (av_image_check_sar(s->width, s->height,
1263  avctx->sample_aspect_ratio) < 0) {
1264  av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1265  avctx->sample_aspect_ratio.num,
1266  avctx->sample_aspect_ratio.den);
1267  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1268  }
1269 
1270  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1271  avctx->coded_width != s->width ||
1272  avctx->coded_height != s->height ||
1273  s1->save_width != s->width ||
1274  s1->save_height != s->height ||
1275  av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1276  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1277  0) {
1278  if (s1->mpeg_enc_ctx_allocated) {
1279  ParseContext pc = s->parse_context;
1280  s->parse_context.buffer = 0;
1281  ff_mpv_common_end(s);
1282  s->parse_context = pc;
1283  s1->mpeg_enc_ctx_allocated = 0;
1284  }
1285 
1286  ret = ff_set_dimensions(avctx, s->width, s->height);
1287  if (ret < 0)
1288  return ret;
1289 
1290  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1291  avctx->rc_max_rate = s->bit_rate;
1292  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1293  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1294  avctx->bit_rate = s->bit_rate;
1295  }
1296  s1->save_aspect = s->avctx->sample_aspect_ratio;
1297  s1->save_width = s->width;
1298  s1->save_height = s->height;
1299  s1->save_progressive_seq = s->progressive_sequence;
1300 
1301  /* low_delay may be forced, in this case we will have B-frames
1302  * that behave like P-frames. */
1303  avctx->has_b_frames = !s->low_delay;
1304 
1305  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1306  // MPEG-1 fps
1307  avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1308  avctx->ticks_per_frame = 1;
1309 
1310  avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1311  } else { // MPEG-2
1312  // MPEG-2 fps
1313  av_reduce(&s->avctx->framerate.num,
1314  &s->avctx->framerate.den,
1315  ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1316  ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1317  1 << 30);
1318  avctx->ticks_per_frame = 2;
1319 
1320  switch (s->chroma_format) {
1321  case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1322  case 2:
1323  case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1324  default: av_assert0(0);
1325  }
1326  } // MPEG-2
1327 
1328  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1329  setup_hwaccel_for_pixfmt(avctx);
1330 
1331  /* Quantization matrices may need reordering
1332  * if DCT permutation is changed. */
1333  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1334 
1335  ff_mpv_idct_init(s);
1336  if ((ret = ff_mpv_common_init(s)) < 0)
1337  return ret;
1338 
1339  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1340  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1341  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1342  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1343 
1344  s1->mpeg_enc_ctx_allocated = 1;
1345  }
1346  return 0;
1347 }
1348 
1349 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1350  int buf_size)
1351 {
1352  Mpeg1Context *s1 = avctx->priv_data;
1353  MpegEncContext *s = &s1->mpeg_enc_ctx;
1354  int ref, f_code, vbv_delay;
1355 
1356  init_get_bits(&s->gb, buf, buf_size * 8);
1357 
1358  ref = get_bits(&s->gb, 10); /* temporal ref */
1359  s->pict_type = get_bits(&s->gb, 3);
1360  if (s->pict_type == 0 || s->pict_type > 3)
1361  return AVERROR_INVALIDDATA;
1362 
1363  vbv_delay = get_bits(&s->gb, 16);
1364  s->vbv_delay = vbv_delay;
1365  if (s->pict_type == AV_PICTURE_TYPE_P ||
1366  s->pict_type == AV_PICTURE_TYPE_B) {
1367  s->full_pel[0] = get_bits1(&s->gb);
1368  f_code = get_bits(&s->gb, 3);
1369  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1370  return AVERROR_INVALIDDATA;
1371  f_code += !f_code;
1372  s->mpeg_f_code[0][0] = f_code;
1373  s->mpeg_f_code[0][1] = f_code;
1374  }
1375  if (s->pict_type == AV_PICTURE_TYPE_B) {
1376  s->full_pel[1] = get_bits1(&s->gb);
1377  f_code = get_bits(&s->gb, 3);
1378  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1379  return AVERROR_INVALIDDATA;
1380  f_code += !f_code;
1381  s->mpeg_f_code[1][0] = f_code;
1382  s->mpeg_f_code[1][1] = f_code;
1383  }
1384  s->current_picture.f->pict_type = s->pict_type;
1385  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1386 
1387  if (avctx->debug & FF_DEBUG_PICT_INFO)
1388  av_log(avctx, AV_LOG_DEBUG,
1389  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1390 
1391  s->y_dc_scale = 8;
1392  s->c_dc_scale = 8;
1393  return 0;
1394 }
1395 
1396 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1397 {
1398  MpegEncContext *s = &s1->mpeg_enc_ctx;
1399  int horiz_size_ext, vert_size_ext;
1400  int bit_rate_ext;
1401 
1402  skip_bits(&s->gb, 1); /* profile and level esc*/
1403  s->avctx->profile = get_bits(&s->gb, 3);
1404  s->avctx->level = get_bits(&s->gb, 4);
1405  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1406  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1407 
1408  if (!s->chroma_format) {
1409  s->chroma_format = 1;
1410  av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1411  }
1412 
1413  horiz_size_ext = get_bits(&s->gb, 2);
1414  vert_size_ext = get_bits(&s->gb, 2);
1415  s->width |= (horiz_size_ext << 12);
1416  s->height |= (vert_size_ext << 12);
1417  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1418  s->bit_rate += (bit_rate_ext << 18) * 400LL;
1419  check_marker(s->avctx, &s->gb, "after bit rate extension");
1420  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1421 
1422  s->low_delay = get_bits1(&s->gb);
1423  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1424  s->low_delay = 1;
1425 
1426  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1427  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1428 
1429  ff_dlog(s->avctx, "sequence extension\n");
1430  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1431 
1432  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1433  av_log(s->avctx, AV_LOG_DEBUG,
1434  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1435  s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1436  s->avctx->rc_buffer_size, s->bit_rate);
1437 }
1438 
1439 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1440 {
1441  MpegEncContext *s = &s1->mpeg_enc_ctx;
1442  int color_description, w, h;
1443 
1444  skip_bits(&s->gb, 3); /* video format */
1445  color_description = get_bits1(&s->gb);
1446  if (color_description) {
1447  s->avctx->color_primaries = get_bits(&s->gb, 8);
1448  s->avctx->color_trc = get_bits(&s->gb, 8);
1449  s->avctx->colorspace = get_bits(&s->gb, 8);
1450  }
1451  w = get_bits(&s->gb, 14);
1452  skip_bits(&s->gb, 1); // marker
1453  h = get_bits(&s->gb, 14);
1454  // remaining 3 bits are zero padding
1455 
1456  s1->pan_scan.width = 16 * w;
1457  s1->pan_scan.height = 16 * h;
1458 
1459  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1460  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1461 }
1462 
1463 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1464 {
1465  MpegEncContext *s = &s1->mpeg_enc_ctx;
1466  int i, nofco;
1467 
1468  nofco = 1;
1469  if (s->progressive_sequence) {
1470  if (s->repeat_first_field) {
1471  nofco++;
1472  if (s->top_field_first)
1473  nofco++;
1474  }
1475  } else {
1476  if (s->picture_structure == PICT_FRAME) {
1477  nofco++;
1478  if (s->repeat_first_field)
1479  nofco++;
1480  }
1481  }
1482  for (i = 0; i < nofco; i++) {
1483  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1484  skip_bits(&s->gb, 1); // marker
1485  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1486  skip_bits(&s->gb, 1); // marker
1487  }
1488 
1489  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1490  av_log(s->avctx, AV_LOG_DEBUG,
1491  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1492  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1493  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1494  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1495 }
1496 
1497 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1498  uint16_t matrix1[64], int intra)
1499 {
1500  int i;
1501 
1502  for (i = 0; i < 64; i++) {
1503  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1504  int v = get_bits(&s->gb, 8);
1505  if (v == 0) {
1506  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1507  return AVERROR_INVALIDDATA;
1508  }
1509  if (intra && i == 0 && v != 8) {
1510  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1511  v = 8; // needed by pink.mpg / issue1046
1512  }
1513  matrix0[j] = v;
1514  if (matrix1)
1515  matrix1[j] = v;
1516  }
1517  return 0;
1518 }
1519 
1520 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1521 {
1522  ff_dlog(s->avctx, "matrix extension\n");
1523 
1524  if (get_bits1(&s->gb))
1525  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1526  if (get_bits1(&s->gb))
1527  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1528  if (get_bits1(&s->gb))
1529  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1530  if (get_bits1(&s->gb))
1531  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1532 }
1533 
1534 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1535 {
1536  MpegEncContext *s = &s1->mpeg_enc_ctx;
1537 
1538  s->full_pel[0] = s->full_pel[1] = 0;
1539  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1540  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1541  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1542  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1543  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1544  av_log(s->avctx, AV_LOG_ERROR,
1545  "Missing picture start code, guessing missing values\n");
1546  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1547  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1548  s->pict_type = AV_PICTURE_TYPE_I;
1549  else
1550  s->pict_type = AV_PICTURE_TYPE_P;
1551  } else
1552  s->pict_type = AV_PICTURE_TYPE_B;
1553  s->current_picture.f->pict_type = s->pict_type;
1554  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1555  }
1556  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1557  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1558  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1559  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1560 
1561  s->intra_dc_precision = get_bits(&s->gb, 2);
1562  s->picture_structure = get_bits(&s->gb, 2);
1563  s->top_field_first = get_bits1(&s->gb);
1564  s->frame_pred_frame_dct = get_bits1(&s->gb);
1565  s->concealment_motion_vectors = get_bits1(&s->gb);
1566  s->q_scale_type = get_bits1(&s->gb);
1567  s->intra_vlc_format = get_bits1(&s->gb);
1568  s->alternate_scan = get_bits1(&s->gb);
1569  s->repeat_first_field = get_bits1(&s->gb);
1570  s->chroma_420_type = get_bits1(&s->gb);
1571  s->progressive_frame = get_bits1(&s->gb);
1572 
1573  if (s->alternate_scan) {
1574  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1575  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1576  } else {
1577  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1578  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1579  }
1580 
1581  /* composite display not parsed */
1582  ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1583  ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1584  ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1585  ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1586  ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1587  ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1588  ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1589  ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1590  ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1591 }
1592 
1593 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1594 {
1595  AVCodecContext *avctx = s->avctx;
1596  Mpeg1Context *s1 = (Mpeg1Context *) s;
1597  int ret;
1598 
1599  /* start frame decoding */
1600  if (s->first_field || s->picture_structure == PICT_FRAME) {
1601  AVFrameSideData *pan_scan;
1602 
1603  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1604  return ret;
1605 
1606  ff_mpeg_er_frame_start(s);
1607 
1608  /* first check if we must repeat the frame */
1609  s->current_picture_ptr->f->repeat_pict = 0;
1610  if (s->repeat_first_field) {
1611  if (s->progressive_sequence) {
1612  if (s->top_field_first)
1613  s->current_picture_ptr->f->repeat_pict = 4;
1614  else
1615  s->current_picture_ptr->f->repeat_pict = 2;
1616  } else if (s->progressive_frame) {
1617  s->current_picture_ptr->f->repeat_pict = 1;
1618  }
1619  }
1620 
1621  pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1622  AV_FRAME_DATA_PANSCAN,
1623  sizeof(s1->pan_scan));
1624  if (!pan_scan)
1625  return AVERROR(ENOMEM);
1626  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1627 
1628  if (s1->a53_caption) {
1629  AVFrameSideData *sd = av_frame_new_side_data(
1630  s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1631  s1->a53_caption_size);
1632  if (sd)
1633  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1634  av_freep(&s1->a53_caption);
1635  }
1636 
1637  if (s1->has_stereo3d) {
1638  AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1639  if (!stereo)
1640  return AVERROR(ENOMEM);
1641 
1642  *stereo = s1->stereo3d;
1643  s1->has_stereo3d = 0;
1644  }
1645 
1646  if (s1->has_afd) {
1647  AVFrameSideData *sd =
1648  av_frame_new_side_data(s->current_picture_ptr->f,
1649  AV_FRAME_DATA_AFD, 1);
1650  if (!sd)
1651  return AVERROR(ENOMEM);
1652 
1653  *sd->data = s1->afd;
1654  s1->has_afd = 0;
1655  }
1656 
1657  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1658  ff_thread_finish_setup(avctx);
1659  } else { // second field
1660  int i;
1661 
1662  if (!s->current_picture_ptr) {
1663  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1664  return AVERROR_INVALIDDATA;
1665  }
1666 
1667  if (s->avctx->hwaccel &&
1668  (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1669  if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1670  av_log(avctx, AV_LOG_ERROR,
1671  "hardware accelerator failed to decode first field\n");
1672  return ret;
1673  }
1674  }
1675 
1676  for (i = 0; i < 4; i++) {
1677  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1678  if (s->picture_structure == PICT_BOTTOM_FIELD)
1679  s->current_picture.f->data[i] +=
1680  s->current_picture_ptr->f->linesize[i];
1681  }
1682  }
1683 
1684  if (avctx->hwaccel) {
1685  if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1686  return ret;
1687  }
1688 
1689  return 0;
1690 }
1691 
1692 #define DECODE_SLICE_ERROR -1
1693 #define DECODE_SLICE_OK 0
1694 
1695 /**
1696  * Decode a slice.
1697  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1698  * @return DECODE_SLICE_ERROR if the slice is damaged,
1699  * DECODE_SLICE_OK if this slice is OK
1700  */
1701 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1702  const uint8_t **buf, int buf_size)
1703 {
1704  AVCodecContext *avctx = s->avctx;
1705  const int lowres = s->avctx->lowres;
1706  const int field_pic = s->picture_structure != PICT_FRAME;
1707  int ret;
1708 
1709  s->resync_mb_x =
1710  s->resync_mb_y = -1;
1711 
1712  av_assert0(mb_y < s->mb_height);
1713 
1714  init_get_bits(&s->gb, *buf, buf_size * 8);
1715  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1716  skip_bits(&s->gb, 3);
1717 
1718  ff_mpeg1_clean_buffers(s);
1719  s->interlaced_dct = 0;
1720 
1721  s->qscale = mpeg_get_qscale(s);
1722 
1723  if (s->qscale == 0) {
1724  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1725  return AVERROR_INVALIDDATA;
1726  }
1727 
1728  /* extra slice info */
1729  if (skip_1stop_8data_bits(&s->gb) < 0)
1730  return AVERROR_INVALIDDATA;
1731 
1732  s->mb_x = 0;
1733 
1734  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1735  skip_bits1(&s->gb);
1736  } else {
1737  while (get_bits_left(&s->gb) > 0) {
1738  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1739  MBINCR_VLC_BITS, 2);
1740  if (code < 0) {
1741  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1742  return AVERROR_INVALIDDATA;
1743  }
1744  if (code >= 33) {
1745  if (code == 33)
1746  s->mb_x += 33;
1747  /* otherwise, stuffing, nothing to do */
1748  } else {
1749  s->mb_x += code;
1750  break;
1751  }
1752  }
1753  }
1754 
1755  if (s->mb_x >= (unsigned) s->mb_width) {
1756  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1757  return AVERROR_INVALIDDATA;
1758  }
1759 
1760  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1761  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1762  int start_code = -1;
1763  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1764  if (buf_end < *buf + buf_size)
1765  buf_end -= 4;
1766  s->mb_y = mb_y;
1767  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1768  return DECODE_SLICE_ERROR;
1769  *buf = buf_end;
1770  return DECODE_SLICE_OK;
1771  }
1772 
1773  s->resync_mb_x = s->mb_x;
1774  s->resync_mb_y = s->mb_y = mb_y;
1775  s->mb_skip_run = 0;
1776  ff_init_block_index(s);
1777 
1778  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1779  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1780  av_log(s->avctx, AV_LOG_DEBUG,
1781  "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1782  s->qscale,
1783  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1784  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1785  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1786  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1787  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1788  s->progressive_sequence ? "ps" : "",
1789  s->progressive_frame ? "pf" : "",
1790  s->alternate_scan ? "alt" : "",
1791  s->top_field_first ? "top" : "",
1792  s->intra_dc_precision, s->picture_structure,
1793  s->frame_pred_frame_dct, s->concealment_motion_vectors,
1794  s->q_scale_type, s->intra_vlc_format,
1795  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1796  }
1797  }
1798 
1799  for (;;) {
1800  // If 1, we memcpy blocks in xvmcvideo.
1801  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1802  ff_xvmc_init_block(s); // set s->block
1803 
1804  if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1805  return ret;
1806 
1807  // Note motion_val is normally NULL unless we want to extract the MVs.
1808  if (s->current_picture.motion_val[0] && !s->encoding) {
1809  const int wrap = s->b8_stride;
1810  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1811  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1812  int motion_x, motion_y, dir, i;
1813 
1814  for (i = 0; i < 2; i++) {
1815  for (dir = 0; dir < 2; dir++) {
1816  if (s->mb_intra ||
1817  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1818  motion_x = motion_y = 0;
1819  } else if (s->mv_type == MV_TYPE_16X16 ||
1820  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1821  motion_x = s->mv[dir][0][0];
1822  motion_y = s->mv[dir][0][1];
1823  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1824  motion_x = s->mv[dir][i][0];
1825  motion_y = s->mv[dir][i][1];
1826  }
1827 
1828  s->current_picture.motion_val[dir][xy][0] = motion_x;
1829  s->current_picture.motion_val[dir][xy][1] = motion_y;
1830  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1831  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1832  s->current_picture.ref_index [dir][b8_xy] =
1833  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1834  av_assert2(s->field_select[dir][i] == 0 ||
1835  s->field_select[dir][i] == 1);
1836  }
1837  xy += wrap;
1838  b8_xy += 2;
1839  }
1840  }
1841 
1842  s->dest[0] += 16 >> lowres;
1843  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1844  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1845 
1846  ff_mpv_reconstruct_mb(s, s->block);
1847 
1848  if (++s->mb_x >= s->mb_width) {
1849  const int mb_size = 16 >> s->avctx->lowres;
1850  int left;
1851 
1852  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1853  ff_mpv_report_decode_progress(s);
1854 
1855  s->mb_x = 0;
1856  s->mb_y += 1 << field_pic;
1857 
1858  if (s->mb_y >= s->mb_height) {
1859  int left = get_bits_left(&s->gb);
1860  int is_d10 = s->chroma_format == 2 &&
1861  s->pict_type == AV_PICTURE_TYPE_I &&
1862  avctx->profile == 0 && avctx->level == 5 &&
1863  s->intra_dc_precision == 2 &&
1864  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1865  s->progressive_frame == 0
1866  /* vbv_delay == 0xBBB || 0xE10 */;
1867 
1868  if (left >= 32 && !is_d10) {
1869  GetBitContext gb = s->gb;
1870  align_get_bits(&gb);
1871  if (show_bits(&gb, 24) == 0x060E2B) {
1872  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1873  is_d10 = 1;
1874  }
1875  if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1876  av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1877  goto eos;
1878  }
1879  }
1880 
1881  if (left < 0 ||
1882  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1883  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1884  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1885  left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1886  return AVERROR_INVALIDDATA;
1887  } else
1888  goto eos;
1889  }
1890  // There are some files out there which are missing the last slice
1891  // in cases where the slice is completely outside the visible
1892  // area, we detect this here instead of running into the end expecting
1893  // more data
1894  left = get_bits_left(&s->gb);
1895  if (s->mb_y >= ((s->height + 15) >> 4) &&
1896  !s->progressive_sequence &&
1897  left <= 25 &&
1898  left >= 0 &&
1899  s->mb_skip_run == -1 &&
1900  (!left || show_bits(&s->gb, left) == 0))
1901  goto eos;
1902 
1903  ff_init_block_index(s);
1904  }
1905 
1906  /* skip mb handling */
1907  if (s->mb_skip_run == -1) {
1908  /* read increment again */
1909  s->mb_skip_run = 0;
1910  for (;;) {
1911  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1912  MBINCR_VLC_BITS, 2);
1913  if (code < 0) {
1914  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1915  return AVERROR_INVALIDDATA;
1916  }
1917  if (code >= 33) {
1918  if (code == 33) {
1919  s->mb_skip_run += 33;
1920  } else if (code == 35) {
1921  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1922  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1923  return AVERROR_INVALIDDATA;
1924  }
1925  goto eos; /* end of slice */
1926  }
1927  /* otherwise, stuffing, nothing to do */
1928  } else {
1929  s->mb_skip_run += code;
1930  break;
1931  }
1932  }
1933  if (s->mb_skip_run) {
1934  int i;
1935  if (s->pict_type == AV_PICTURE_TYPE_I) {
1936  av_log(s->avctx, AV_LOG_ERROR,
1937  "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1938  return AVERROR_INVALIDDATA;
1939  }
1940 
1941  /* skip mb */
1942  s->mb_intra = 0;
1943  for (i = 0; i < 12; i++)
1944  s->block_last_index[i] = -1;
1945  if (s->picture_structure == PICT_FRAME)
1946  s->mv_type = MV_TYPE_16X16;
1947  else
1948  s->mv_type = MV_TYPE_FIELD;
1949  if (s->pict_type == AV_PICTURE_TYPE_P) {
1950  /* if P type, zero motion vector is implied */
1951  s->mv_dir = MV_DIR_FORWARD;
1952  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1953  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1954  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1955  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1956  } else {
1957  /* if B type, reuse previous vectors and directions */
1958  s->mv[0][0][0] = s->last_mv[0][0][0];
1959  s->mv[0][0][1] = s->last_mv[0][0][1];
1960  s->mv[1][0][0] = s->last_mv[1][0][0];
1961  s->mv[1][0][1] = s->last_mv[1][0][1];
1962  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1963  s->field_select[1][0] = (s->picture_structure - 1) & 1;
1964  }
1965  }
1966  }
1967  }
1968 eos: // end of slice
1969  if (get_bits_left(&s->gb) < 0) {
1970  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1971  return AVERROR_INVALIDDATA;
1972  }
1973  *buf += (get_bits_count(&s->gb) - 1) / 8;
1974  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);
1975  return 0;
1976 }
1977 
1978 static int slice_decode_thread(AVCodecContext *c, void *arg)
1979 {
1980  MpegEncContext *s = *(void **) arg;
1981  const uint8_t *buf = s->gb.buffer;
1982  int mb_y = s->start_mb_y;
1983  const int field_pic = s->picture_structure != PICT_FRAME;
1984 
1985  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1986 
1987  for (;;) {
1988  uint32_t start_code;
1989  int ret;
1990 
1991  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1992  emms_c();
1993  ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1994  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1995  s->start_mb_y, s->end_mb_y, s->er.error_count);
1996  if (ret < 0) {
1997  if (c->err_recognition & AV_EF_EXPLODE)
1998  return ret;
1999  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2000  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2001  s->mb_x, s->mb_y,
2002  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2003  } else {
2004  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2005  s->mb_x - 1, s->mb_y,
2006  ER_AC_END | ER_DC_END | ER_MV_END);
2007  }
2008 
2009  if (s->mb_y == s->end_mb_y)
2010  return 0;
2011 
2012  start_code = -1;
2013  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2014  mb_y = start_code - SLICE_MIN_START_CODE;
2015  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2016  mb_y += (*buf&0xE0)<<2;
2017  mb_y <<= field_pic;
2018  if (s->picture_structure == PICT_BOTTOM_FIELD)
2019  mb_y++;
2020  if (mb_y < 0 || mb_y >= s->end_mb_y)
2021  return AVERROR_INVALIDDATA;
2022  }
2023 }
2024 
2025 /**
2026  * Handle slice ends.
2027  * @return 1 if it seems to be the last slice
2028  */
2029 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2030 {
2031  Mpeg1Context *s1 = avctx->priv_data;
2032  MpegEncContext *s = &s1->mpeg_enc_ctx;
2033 
2034  if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2035  return 0;
2036 
2037  if (s->avctx->hwaccel) {
2038  int ret = s->avctx->hwaccel->end_frame(s->avctx);
2039  if (ret < 0) {
2040  av_log(avctx, AV_LOG_ERROR,
2041  "hardware accelerator failed to decode picture\n");
2042  return ret;
2043  }
2044  }
2045 
2046  /* end of slice reached */
2047  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2048  /* end of image */
2049 
2050  ff_er_frame_end(&s->er);
2051 
2052  ff_mpv_frame_end(s);
2053 
2054  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2055  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2056  if (ret < 0)
2057  return ret;
2058  ff_print_debug_info(s, s->current_picture_ptr, pict);
2059  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2060  } else {
2061  if (avctx->active_thread_type & FF_THREAD_FRAME)
2062  s->picture_number++;
2063  /* latency of 1 frame for I- and P-frames */
2064  /* XXX: use another variable than picture_number */
2065  if (s->last_picture_ptr) {
2066  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2067  if (ret < 0)
2068  return ret;
2069  ff_print_debug_info(s, s->last_picture_ptr, pict);
2070  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2071  }
2072  }
2073 
2074  return 1;
2075  } else {
2076  return 0;
2077  }
2078 }
2079 
2080 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2081  const uint8_t *buf, int buf_size)
2082 {
2083  Mpeg1Context *s1 = avctx->priv_data;
2084  MpegEncContext *s = &s1->mpeg_enc_ctx;
2085  int width, height;
2086  int i, v, j;
2087 
2088  init_get_bits(&s->gb, buf, buf_size * 8);
2089 
2090  width = get_bits(&s->gb, 12);
2091  height = get_bits(&s->gb, 12);
2092  if (width == 0 || height == 0) {
2093  av_log(avctx, AV_LOG_WARNING,
2094  "Invalid horizontal or vertical size value.\n");
2095  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2096  return AVERROR_INVALIDDATA;
2097  }
2098  s->aspect_ratio_info = get_bits(&s->gb, 4);
2099  if (s->aspect_ratio_info == 0) {
2100  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2101  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2102  return AVERROR_INVALIDDATA;
2103  }
2104  s->frame_rate_index = get_bits(&s->gb, 4);
2105  if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2106  av_log(avctx, AV_LOG_WARNING,
2107  "frame_rate_index %d is invalid\n", s->frame_rate_index);
2108  s->frame_rate_index = 1;
2109  }
2110  s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2111  if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2112  return AVERROR_INVALIDDATA;
2113  }
2114 
2115  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2116  skip_bits(&s->gb, 1);
2117 
2118  /* get matrix */
2119  if (get_bits1(&s->gb)) {
2120  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2121  } else {
2122  for (i = 0; i < 64; i++) {
2123  j = s->idsp.idct_permutation[i];
2124  v = ff_mpeg1_default_intra_matrix[i];
2125  s->intra_matrix[j] = v;
2126  s->chroma_intra_matrix[j] = v;
2127  }
2128  }
2129  if (get_bits1(&s->gb)) {
2130  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2131  } else {
2132  for (i = 0; i < 64; i++) {
2133  int j = s->idsp.idct_permutation[i];
2134  v = ff_mpeg1_default_non_intra_matrix[i];
2135  s->inter_matrix[j] = v;
2136  s->chroma_inter_matrix[j] = v;
2137  }
2138  }
2139 
2140  if (show_bits(&s->gb, 23) != 0) {
2141  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2142  return AVERROR_INVALIDDATA;
2143  }
2144 
2145  s->width = width;
2146  s->height = height;
2147 
2148  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2149  s->progressive_sequence = 1;
2150  s->progressive_frame = 1;
2151  s->picture_structure = PICT_FRAME;
2152  s->first_field = 0;
2153  s->frame_pred_frame_dct = 1;
2154  s->chroma_format = 1;
2155  s->codec_id =
2156  s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2157  s->out_format = FMT_MPEG1;
2158  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2159  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2160  s->low_delay = 1;
2161 
2162  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2163  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2164  s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2165 
2166  return 0;
2167 }
2168 
2169 static int vcr2_init_sequence(AVCodecContext *avctx)
2170 {
2171  Mpeg1Context *s1 = avctx->priv_data;
2172  MpegEncContext *s = &s1->mpeg_enc_ctx;
2173  int i, v, ret;
2174 
2175  /* start new MPEG-1 context decoding */
2176  s->out_format = FMT_MPEG1;
2177  if (s1->mpeg_enc_ctx_allocated) {
2178  ff_mpv_common_end(s);
2179  s1->mpeg_enc_ctx_allocated = 0;
2180  }
2181  s->width = avctx->coded_width;
2182  s->height = avctx->coded_height;
2183  avctx->has_b_frames = 0; // true?
2184  s->low_delay = 1;
2185 
2186  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2187  setup_hwaccel_for_pixfmt(avctx);
2188 
2189  ff_mpv_idct_init(s);
2190  if ((ret = ff_mpv_common_init(s)) < 0)
2191  return ret;
2192  s1->mpeg_enc_ctx_allocated = 1;
2193 
2194  for (i = 0; i < 64; i++) {
2195  int j = s->idsp.idct_permutation[i];
2196  v = ff_mpeg1_default_intra_matrix[i];
2197  s->intra_matrix[j] = v;
2198  s->chroma_intra_matrix[j] = v;
2199 
2200  v = ff_mpeg1_default_non_intra_matrix[i];
2201  s->inter_matrix[j] = v;
2202  s->chroma_inter_matrix[j] = v;
2203  }
2204 
2205  s->progressive_sequence = 1;
2206  s->progressive_frame = 1;
2207  s->picture_structure = PICT_FRAME;
2208  s->first_field = 0;
2209  s->frame_pred_frame_dct = 1;
2210  s->chroma_format = 1;
2211  if (s->codec_tag == AV_RL32("BW10")) {
2212  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2213  } else {
2214  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2215  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2216  }
2217  s1->save_width = s->width;
2218  s1->save_height = s->height;
2219  s1->save_progressive_seq = s->progressive_sequence;
2220  return 0;
2221 }
2222 
2223 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2224  const uint8_t *p, int buf_size)
2225 {
2226  Mpeg1Context *s1 = avctx->priv_data;
2227 
2228  if (buf_size >= 6 &&
2229  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2230  p[4] == 3 && (p[5] & 0x40)) {
2231  /* extract A53 Part 4 CC data */
2232  int cc_count = p[5] & 0x1f;
2233  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2234  av_freep(&s1->a53_caption);
2235  s1->a53_caption_size = cc_count * 3;
2236  s1->a53_caption = av_malloc(s1->a53_caption_size);
2237  if (!s1->a53_caption) {
2238  s1->a53_caption_size = 0;
2239  } else {
2240  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2241  }
2242  avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2243  }
2244  return 1;
2245  } else if (buf_size >= 2 &&
2246  p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2247  /* extract SCTE-20 CC data */
2248  GetBitContext gb;
2249  int cc_count = 0;
2250  int i;
2251 
2252  init_get_bits(&gb, p + 2, buf_size - 2);
2253  cc_count = get_bits(&gb, 5);
2254  if (cc_count > 0) {
2255  av_freep(&s1->a53_caption);
2256  s1->a53_caption_size = cc_count * 3;
2257  s1->a53_caption = av_mallocz(s1->a53_caption_size);
2258  if (!s1->a53_caption) {
2259  s1->a53_caption_size = 0;
2260  } else {
2261  uint8_t field, cc1, cc2;
2262  uint8_t *cap = s1->a53_caption;
2263  for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2264  skip_bits(&gb, 2); // priority
2265  field = get_bits(&gb, 2);
2266  skip_bits(&gb, 5); // line_offset
2267  cc1 = get_bits(&gb, 8);
2268  cc2 = get_bits(&gb, 8);
2269  skip_bits(&gb, 1); // marker
2270 
2271  if (!field) { // forbidden
2272  cap[0] = cap[1] = cap[2] = 0x00;
2273  } else {
2274  field = (field == 2 ? 1 : 0);
2275  if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2276  cap[0] = 0x04 | field;
2277  cap[1] = ff_reverse[cc1];
2278  cap[2] = ff_reverse[cc2];
2279  }
2280  cap += 3;
2281  }
2282  }
2283  avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2284  }
2285  return 1;
2286  } else if (buf_size >= 11 &&
2287  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2288  /* extract DVD CC data
2289  *
2290  * uint32_t user_data_start_code 0x000001B2 (big endian)
2291  * uint16_t user_identifier 0x4343 "CC"
2292  * uint8_t user_data_type_code 0x01
2293  * uint8_t caption_block_size 0xF8
2294  * uint8_t
2295  * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2296  * bit 6 caption_filler 0
2297  * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2298  * bit 0 caption_extra_field_added 1=one additional caption word
2299  *
2300  * struct caption_field_block {
2301  * uint8_t
2302  * bit 7:1 caption_filler 0x7F (all 1s)
2303  * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2304  * uint8_t caption_first_byte
2305  * uint8_t caption_second_byte
2306  * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2307  *
2308  * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2309  * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2310  * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2311  * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2312  * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2313  int cc_count = 0;
2314  int i;
2315  // There is a caption count field in the data, but it is often
2316  // incorrect. So count the number of captions present.
2317  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2318  cc_count++;
2319  // Transform the DVD format into A53 Part 4 format
2320  if (cc_count > 0) {
2321  av_freep(&s1->a53_caption);
2322  s1->a53_caption_size = cc_count * 6;
2323  s1->a53_caption = av_malloc(s1->a53_caption_size);
2324  if (!s1->a53_caption) {
2325  s1->a53_caption_size = 0;
2326  } else {
2327  uint8_t field1 = !!(p[4] & 0x80);
2328  uint8_t *cap = s1->a53_caption;
2329  p += 5;
2330  for (i = 0; i < cc_count; i++) {
2331  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2332  cap[1] = p[1];
2333  cap[2] = p[2];
2334  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2335  cap[4] = p[4];
2336  cap[5] = p[5];
2337  cap += 6;
2338  p += 6;
2339  }
2340  }
2341  avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2342  }
2343  return 1;
2344  }
2345  return 0;
2346 }
2347 
2348 static void mpeg_decode_user_data(AVCodecContext *avctx,
2349  const uint8_t *p, int buf_size)
2350 {
2351  Mpeg1Context *s = avctx->priv_data;
2352  const uint8_t *buf_end = p + buf_size;
2353  Mpeg1Context *s1 = avctx->priv_data;
2354 
2355 #if 0
2356  int i;
2357  for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2358  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2359  }
2360  av_log(avctx, AV_LOG_ERROR, "\n");
2361 #endif
2362 
2363  if (buf_size > 29){
2364  int i;
2365  for(i=0; i<20; i++)
2366  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2367  s->tmpgexs= 1;
2368  }
2369  }
2370  /* we parse the DTG active format information */
2371  if (buf_end - p >= 5 &&
2372  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2373  int flags = p[4];
2374  p += 5;
2375  if (flags & 0x80) {
2376  /* skip event id */
2377  p += 2;
2378  }
2379  if (flags & 0x40) {
2380  if (buf_end - p < 1)
2381  return;
2382  s1->has_afd = 1;
2383  s1->afd = p[0] & 0x0f;
2384  }
2385  } else if (buf_end - p >= 6 &&
2386  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2387  p[4] == 0x03) { // S3D_video_format_length
2388  // the 0x7F mask ignores the reserved_bit value
2389  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2390 
2391  if (S3D_video_format_type == 0x03 ||
2392  S3D_video_format_type == 0x04 ||
2393  S3D_video_format_type == 0x08 ||
2394  S3D_video_format_type == 0x23) {
2395 
2396  s1->has_stereo3d = 1;
2397 
2398  switch (S3D_video_format_type) {
2399  case 0x03:
2400  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2401  break;
2402  case 0x04:
2403  s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2404  break;
2405  case 0x08:
2406  s1->stereo3d.type = AV_STEREO3D_2D;
2407  break;
2408  case 0x23:
2409  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2410  break;
2411  }
2412  }
2413  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2414  return;
2415  }
2416 }
2417 
2418 static void mpeg_decode_gop(AVCodecContext *avctx,
2419  const uint8_t *buf, int buf_size)
2420 {
2421  Mpeg1Context *s1 = avctx->priv_data;
2422  MpegEncContext *s = &s1->mpeg_enc_ctx;
2423  int broken_link;
2424  int64_t tc;
2425 
2426  init_get_bits(&s->gb, buf, buf_size * 8);
2427 
2428  tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2429 
2430 #if FF_API_PRIVATE_OPT
2431 FF_DISABLE_DEPRECATION_WARNINGS
2432  avctx->timecode_frame_start = tc;
2433 FF_ENABLE_DEPRECATION_WARNINGS
2434 #endif
2435 
2436  s->closed_gop = get_bits1(&s->gb);
2437  /* broken_link indicates that after editing the
2438  * reference frames of the first B-Frames after GOP I-Frame
2439  * are missing (open gop) */
2440  broken_link = get_bits1(&s->gb);
2441 
2442  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2443  char tcbuf[AV_TIMECODE_STR_SIZE];
2444  av_timecode_make_mpeg_tc_string(tcbuf, tc);
2445  av_log(s->avctx, AV_LOG_DEBUG,
2446  "GOP (%s) closed_gop=%d broken_link=%d\n",
2447  tcbuf, s->closed_gop, broken_link);
2448  }
2449 }
2450 
2451 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2452  int *got_output, const uint8_t *buf, int buf_size)
2453 {
2454  Mpeg1Context *s = avctx->priv_data;
2455  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2456  const uint8_t *buf_ptr = buf;
2457  const uint8_t *buf_end = buf + buf_size;
2458  int ret, input_size;
2459  int last_code = 0, skip_frame = 0;
2460  int picture_start_code_seen = 0;
2461 
2462  for (;;) {
2463  /* find next start code */
2464  uint32_t start_code = -1;
2465  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2466  if (start_code > 0x1ff) {
2467  if (!skip_frame) {
2468  if (HAVE_THREADS &&
2469  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2470  !avctx->hwaccel) {
2471  int i;
2472  av_assert0(avctx->thread_count > 1);
2473 
2474  avctx->execute(avctx, slice_decode_thread,
2475  &s2->thread_context[0], NULL,
2476  s->slice_count, sizeof(void *));
2477  for (i = 0; i < s->slice_count; i++)
2478  s2->er.error_count += s2->thread_context[i]->er.error_count;
2479  }
2480 
2481  ret = slice_end(avctx, picture);
2482  if (ret < 0)
2483  return ret;
2484  else if (ret) {
2485  // FIXME: merge with the stuff in mpeg_decode_slice
2486  if (s2->last_picture_ptr || s2->low_delay)
2487  *got_output = 1;
2488  }
2489  }
2490  s2->pict_type = 0;
2491 
2492  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2493  return AVERROR_INVALIDDATA;
2494 
2495  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2496  }
2497 
2498  input_size = buf_end - buf_ptr;
2499 
2500  if (avctx->debug & FF_DEBUG_STARTCODE)
2501  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2502  start_code, buf_ptr - buf, input_size);
2503 
2504  /* prepare data for next start code */
2505  switch (start_code) {
2506  case SEQ_START_CODE:
2507  if (last_code == 0) {
2508  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2509  if (buf != avctx->extradata)
2510  s->sync = 1;
2511  } else {
2512  av_log(avctx, AV_LOG_ERROR,
2513  "ignoring SEQ_START_CODE after %X\n", last_code);
2514  if (avctx->err_recognition & AV_EF_EXPLODE)
2515  return AVERROR_INVALIDDATA;
2516  }
2517  break;
2518 
2519  case PICTURE_START_CODE:
2520  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2521  /* If it's a frame picture, there can't be more than one picture header.
2522  Yet, it does happen and we need to handle it. */
2523  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2524  break;
2525  }
2526  picture_start_code_seen = 1;
2527 
2528  if (s2->width <= 0 || s2->height <= 0) {
2529  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2530  s2->width, s2->height);
2531  return AVERROR_INVALIDDATA;
2532  }
2533 
2534  if (s->tmpgexs){
2535  s2->intra_dc_precision= 3;
2536  s2->intra_matrix[0]= 1;
2537  }
2538  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2539  !avctx->hwaccel && s->slice_count) {
2540  int i;
2541 
2542  avctx->execute(avctx, slice_decode_thread,
2543  s2->thread_context, NULL,
2544  s->slice_count, sizeof(void *));
2545  for (i = 0; i < s->slice_count; i++)
2546  s2->er.error_count += s2->thread_context[i]->er.error_count;
2547  s->slice_count = 0;
2548  }
2549  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2550  ret = mpeg_decode_postinit(avctx);
2551  if (ret < 0) {
2552  av_log(avctx, AV_LOG_ERROR,
2553  "mpeg_decode_postinit() failure\n");
2554  return ret;
2555  }
2556 
2557  /* We have a complete image: we try to decompress it. */
2558  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2559  s2->pict_type = 0;
2560  s->first_slice = 1;
2561  last_code = PICTURE_START_CODE;
2562  } else {
2563  av_log(avctx, AV_LOG_ERROR,
2564  "ignoring pic after %X\n", last_code);
2565  if (avctx->err_recognition & AV_EF_EXPLODE)
2566  return AVERROR_INVALIDDATA;
2567  }
2568  break;
2569  case EXT_START_CODE:
2570  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2571 
2572  switch (get_bits(&s2->gb, 4)) {
2573  case 0x1:
2574  if (last_code == 0) {
2575  mpeg_decode_sequence_extension(s);
2576  } else {
2577  av_log(avctx, AV_LOG_ERROR,
2578  "ignoring seq ext after %X\n", last_code);
2579  if (avctx->err_recognition & AV_EF_EXPLODE)
2580  return AVERROR_INVALIDDATA;
2581  }
2582  break;
2583  case 0x2:
2584  mpeg_decode_sequence_display_extension(s);
2585  break;
2586  case 0x3:
2587  mpeg_decode_quant_matrix_extension(s2);
2588  break;
2589  case 0x7:
2590  mpeg_decode_picture_display_extension(s);
2591  break;
2592  case 0x8:
2593  if (last_code == PICTURE_START_CODE) {
2594  mpeg_decode_picture_coding_extension(s);
2595  } else {
2596  av_log(avctx, AV_LOG_ERROR,
2597  "ignoring pic cod ext after %X\n", last_code);
2598  if (avctx->err_recognition & AV_EF_EXPLODE)
2599  return AVERROR_INVALIDDATA;
2600  }
2601  break;
2602  }
2603  break;
2604  case USER_START_CODE:
2605  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2606  break;
2607  case GOP_START_CODE:
2608  if (last_code == 0) {
2609  s2->first_field = 0;
2610  mpeg_decode_gop(avctx, buf_ptr, input_size);
2611  s->sync = 1;
2612  } else {
2613  av_log(avctx, AV_LOG_ERROR,
2614  "ignoring GOP_START_CODE after %X\n", last_code);
2615  if (avctx->err_recognition & AV_EF_EXPLODE)
2616  return AVERROR_INVALIDDATA;
2617  }
2618  break;
2619  default:
2620  if (start_code >= SLICE_MIN_START_CODE &&
2621  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2622  if (s2->progressive_sequence && !s2->progressive_frame) {
2623  s2->progressive_frame = 1;
2624  av_log(s2->avctx, AV_LOG_ERROR,
2625  "interlaced frame in progressive sequence, ignoring\n");
2626  }
2627 
2628  if (s2->picture_structure == 0 ||
2629  (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2630  av_log(s2->avctx, AV_LOG_ERROR,
2631  "picture_structure %d invalid, ignoring\n",
2632  s2->picture_structure);
2633  s2->picture_structure = PICT_FRAME;
2634  }
2635 
2636  if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2637  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2638 
2639  if (s2->picture_structure == PICT_FRAME) {
2640  s2->first_field = 0;
2641  s2->v_edge_pos = 16 * s2->mb_height;
2642  } else {
2643  s2->first_field ^= 1;
2644  s2->v_edge_pos = 8 * s2->mb_height;
2645  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2646  }
2647  }
2648  if (start_code >= SLICE_MIN_START_CODE &&
2649  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2650  const int field_pic = s2->picture_structure != PICT_FRAME;
2651  int mb_y = start_code - SLICE_MIN_START_CODE;
2652  last_code = SLICE_MIN_START_CODE;
2653  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2654  mb_y += (*buf_ptr&0xE0)<<2;
2655 
2656  mb_y <<= field_pic;
2657  if (s2->picture_structure == PICT_BOTTOM_FIELD)
2658  mb_y++;
2659 
2660  if (buf_end - buf_ptr < 2) {
2661  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2662  return AVERROR_INVALIDDATA;
2663  }
2664 
2665  if (mb_y >= s2->mb_height) {
2666  av_log(s2->avctx, AV_LOG_ERROR,
2667  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2668  return AVERROR_INVALIDDATA;
2669  }
2670 
2671  if (!s2->last_picture_ptr) {
2672  /* Skip B-frames if we do not have reference frames and
2673  * GOP is not closed. */
2674  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2675  if (!s2->closed_gop) {
2676  skip_frame = 1;
2677  av_log(s2->avctx, AV_LOG_DEBUG,
2678  "Skipping B slice due to open GOP\n");
2679  break;
2680  }
2681  }
2682  }
2683  if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2684  s->sync = 1;
2685  if (!s2->next_picture_ptr) {
2686  /* Skip P-frames if we do not have a reference frame or
2687  * we have an invalid header. */
2688  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2689  skip_frame = 1;
2690  av_log(s2->avctx, AV_LOG_DEBUG,
2691  "Skipping P slice due to !sync\n");
2692  break;
2693  }
2694  }
2695  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2696  s2->pict_type == AV_PICTURE_TYPE_B) ||
2697  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2698  s2->pict_type != AV_PICTURE_TYPE_I) ||
2699  avctx->skip_frame >= AVDISCARD_ALL) {
2700  skip_frame = 1;
2701  break;
2702  }
2703 
2704  if (!s->mpeg_enc_ctx_allocated)
2705  break;
2706 
2707  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2708  if (mb_y < avctx->skip_top ||
2709  mb_y >= s2->mb_height - avctx->skip_bottom)
2710  break;
2711  }
2712 
2713  if (!s2->pict_type) {
2714  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2715  if (avctx->err_recognition & AV_EF_EXPLODE)
2716  return AVERROR_INVALIDDATA;
2717  break;
2718  }
2719 
2720  if (s->first_slice) {
2721  skip_frame = 0;
2722  s->first_slice = 0;
2723  if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2724  return ret;
2725  }
2726  if (!s2->current_picture_ptr) {
2727  av_log(avctx, AV_LOG_ERROR,
2728  "current_picture not initialized\n");
2729  return AVERROR_INVALIDDATA;
2730  }
2731 
2732  if (HAVE_THREADS &&
2733  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2734  !avctx->hwaccel) {
2735  int threshold = (s2->mb_height * s->slice_count +
2736  s2->slice_context_count / 2) /
2737  s2->slice_context_count;
2738  av_assert0(avctx->thread_count > 1);
2739  if (threshold <= mb_y) {
2740  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2741 
2742  thread_context->start_mb_y = mb_y;
2743  thread_context->end_mb_y = s2->mb_height;
2744  if (s->slice_count) {
2745  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2746  ret = ff_update_duplicate_context(thread_context, s2);
2747  if (ret < 0)
2748  return ret;
2749  }
2750  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2751  s->slice_count++;
2752  }
2753  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2754  } else {
2755  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2756  emms_c();
2757 
2758  if (ret < 0) {
2759  if (avctx->err_recognition & AV_EF_EXPLODE)
2760  return ret;
2761  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2762  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2763  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2764  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2765  } else {
2766  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2767  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2768  ER_AC_END | ER_DC_END | ER_MV_END);
2769  }
2770  }
2771  }
2772  break;
2773  }
2774  }
2775 }
2776 
2777 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2778  int *got_output, AVPacket *avpkt)
2779 {
2780  const uint8_t *buf = avpkt->data;
2781  int ret;
2782  int buf_size = avpkt->size;
2783  Mpeg1Context *s = avctx->priv_data;
2784  AVFrame *picture = data;
2785  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2786 
2787  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2788  /* special case for last picture */
2789  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2790  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2791  if (ret < 0)
2792  return ret;
2793 
2794  s2->next_picture_ptr = NULL;
2795 
2796  *got_output = 1;
2797  }
2798  return buf_size;
2799  }
2800 
2801  if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2802  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2803  buf_size, NULL);
2804 
2805  if (ff_combine_frame(&s2->parse_context, next,
2806  (const uint8_t **) &buf, &buf_size) < 0)
2807  return buf_size;
2808  }
2809 
2810  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2811  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2812  || s2->codec_tag == AV_RL32("BW10")
2813  ))
2814  vcr2_init_sequence(avctx);
2815 
2816  s->slice_count = 0;
2817 
2818  if (avctx->extradata && !s->extradata_decoded) {
2819  ret = decode_chunks(avctx, picture, got_output,
2820  avctx->extradata, avctx->extradata_size);
2821  if (*got_output) {
2822  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2823  av_frame_unref(picture);
2824  *got_output = 0;
2825  }
2826  s->extradata_decoded = 1;
2827  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2828  s2->current_picture_ptr = NULL;
2829  return ret;
2830  }
2831  }
2832 
2833  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2834  if (ret<0 || *got_output) {
2835  s2->current_picture_ptr = NULL;
2836 
2837  if (s2->timecode_frame_start != -1 && *got_output) {
2838  AVFrameSideData *tcside = av_frame_new_side_data(picture,
2839  AV_FRAME_DATA_GOP_TIMECODE,
2840  sizeof(int64_t));
2841  if (!tcside)
2842  return AVERROR(ENOMEM);
2843  memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2844 
2845  s2->timecode_frame_start = -1;
2846  }
2847  }
2848 
2849  return ret;
2850 }
2851 
2852 static void flush(AVCodecContext *avctx)
2853 {
2854  Mpeg1Context *s = avctx->priv_data;
2855 
2856  s->sync = 0;
2857 
2858  ff_mpeg_flush(avctx);
2859 }
2860 
2861 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2862 {
2863  Mpeg1Context *s = avctx->priv_data;
2864 
2865  if (s->mpeg_enc_ctx_allocated)
2866  ff_mpv_common_end(&s->mpeg_enc_ctx);
2867  av_freep(&s->a53_caption);
2868  return 0;
2869 }
2870 
2871 AVCodec ff_mpeg1video_decoder = {
2872  .name = "mpeg1video",
2873  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2874  .type = AVMEDIA_TYPE_VIDEO,
2875  .id = AV_CODEC_ID_MPEG1VIDEO,
2876  .priv_data_size = sizeof(Mpeg1Context),
2877  .init = mpeg_decode_init,
2878  .close = mpeg_decode_end,
2879  .decode = mpeg_decode_frame,
2880  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2881  AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2882  AV_CODEC_CAP_SLICE_THREADS,
2883  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2884  .flush = flush,
2885  .max_lowres = 3,
2886  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2887  .hw_configs = (const AVCodecHWConfigInternal*[]) {
2888 #if CONFIG_MPEG1_NVDEC_HWACCEL
2889  HWACCEL_NVDEC(mpeg1),
2890 #endif
2891 #if CONFIG_MPEG1_VDPAU_HWACCEL
2892  HWACCEL_VDPAU(mpeg1),
2893 #endif
2894 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2895  HWACCEL_VIDEOTOOLBOX(mpeg1),
2896 #endif
2897 #if CONFIG_MPEG1_XVMC_HWACCEL
2898  HWACCEL_XVMC(mpeg1),
2899 #endif
2900  NULL
2901  },
2902 };
2903 
2904 AVCodec ff_mpeg2video_decoder = {
2905  .name = "mpeg2video",
2906  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2907  .type = AVMEDIA_TYPE_VIDEO,
2908  .id = AV_CODEC_ID_MPEG2VIDEO,
2909  .priv_data_size = sizeof(Mpeg1Context),
2910  .init = mpeg_decode_init,
2911  .close = mpeg_decode_end,
2912  .decode = mpeg_decode_frame,
2913  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2914  AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2915  AV_CODEC_CAP_SLICE_THREADS,
2916  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2917  .flush = flush,
2918  .max_lowres = 3,
2919  .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2920  .hw_configs = (const AVCodecHWConfigInternal*[]) {
2921 #if CONFIG_MPEG2_DXVA2_HWACCEL
2922  HWACCEL_DXVA2(mpeg2),
2923 #endif
2924 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2925  HWACCEL_D3D11VA(mpeg2),
2926 #endif
2927 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2928  HWACCEL_D3D11VA2(mpeg2),
2929 #endif
2930 #if CONFIG_MPEG2_NVDEC_HWACCEL
2931  HWACCEL_NVDEC(mpeg2),
2932 #endif
2933 #if CONFIG_MPEG2_VAAPI_HWACCEL
2934  HWACCEL_VAAPI(mpeg2),
2935 #endif
2936 #if CONFIG_MPEG2_VDPAU_HWACCEL
2937  HWACCEL_VDPAU(mpeg2),
2938 #endif
2939 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2940  HWACCEL_VIDEOTOOLBOX(mpeg2),
2941 #endif
2942 #if CONFIG_MPEG2_XVMC_HWACCEL
2943  HWACCEL_XVMC(mpeg2),
2944 #endif
2945  NULL
2946  },
2947 };
2948 
2949 //legacy decoder
2950 AVCodec ff_mpegvideo_decoder = {
2951  .name = "mpegvideo",
2952  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2953  .type = AVMEDIA_TYPE_VIDEO,
2954  .id = AV_CODEC_ID_MPEG2VIDEO,
2955  .priv_data_size = sizeof(Mpeg1Context),
2956  .init = mpeg_decode_init,
2957  .close = mpeg_decode_end,
2958  .decode = mpeg_decode_frame,
2959  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2960  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2961  .flush = flush,
2962  .max_lowres = 3,
2963 };
btype2mb_type
static const uint32_t btype2mb_type[11]
Definition: mpeg12dec.c:86
ff_mpeg1_default_non_intra_matrix
const uint16_t ff_mpeg1_default_non_intra_matrix[64]
Definition: mpeg12data.c:41
show_bits_long
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:587
AV_EF_AGGRESSIVE
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2674
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#define ff_tlog(ctx,...)
Definition: internal.h:75
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IDCTDSPContext idsp
Definition: mpegvideo.h:230
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#define NULL
Definition: coverity.c:32
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:1542
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:3056
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const char const char void * val
Definition: avisynth_c.h:771
AVDISCARD_NONKEY
discard all frames except keyframes
Definition: avcodec.h:802
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int8_t * ref_index[2]
Definition: mpegpicture.h:62
ff_init_block_index
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2272
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int64_t timecode_frame_start
GOP timecode frame start number, in non drop frame format.
Definition: mpegvideo.h:462
AVHWAccel::start_frame
int(* start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Called at the beginning of each frame or field picture.
Definition: avcodec.h:3654
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int aspect_ratio_info
Definition: mpegvideo.h:402
MpegEncContext::picture_number
int picture_number
Definition: mpegvideo.h:127
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#define MB_TYPE_L1
Definition: mpegutils.h:68
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
SLICE_FLAG_ALLOW_FIELD
#define SLICE_FLAG_ALLOW_FIELD
allow draw_horiz_band() with field slices (MPEG-2 field pics)
Definition: avcodec.h:2013
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static int shift(int a, int b)
Definition: sonic.c:82
av_div_q
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
AVCHROMA_LOC_LEFT
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:533
MAX_INDEX
#define MAX_INDEX
Definition: mpeg12dec.c:127
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:226
quant_matrix_rebuild
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, const uint8_t *new_perm)
Definition: mpeg12dec.c:1111
h
h
Definition: vp9dsp_template.c:2038
HWACCEL_D3D11VA2
#define HWACCEL_D3D11VA2(codec)
Definition: hwaccel.h:69
data
ptrdiff_t const GLvoid * data
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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:153
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#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:269
HWACCEL_NVDEC
#define HWACCEL_NVDEC(codec)
Definition: hwaccel.h:71
MpegEncContext::last_mv
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG-1 & B-frame MPEG-4
Definition: mpegvideo.h:278
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1721
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float re
Definition: fft.c:82
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static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1439
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planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
imgutils.h
misc image utilities
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static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:381
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
ff_mpeg12_init_vlcs
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:137
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int64_t bit_rate
the average bitrate
Definition: avcodec.h:1583
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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:104
Mpeg1Context::afd
uint8_t afd
Definition: mpeg12dec.c:62
AV_PIX_FMT_VIDEOTOOLBOX
hardware decoding through Videotoolbox
Definition: pixfmt.h:282
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:154
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static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
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uint8_t * a53_caption
Definition: mpeg12dec.c:60
MpegEncContext::chroma_intra_matrix
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:301
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const uint8_t ff_reverse[256]
Definition: reverse.c:23
AVPanScan::height
int height
Definition: avcodec.h:1093
MpegEncContext::v_edge_pos
int v_edge_pos
horizontal / vertical position of the right/bottom edge (pixel replication)
Definition: mpegvideo.h:132
MpegEncContext::chroma_inter_matrix
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:303
ff_er_frame_end
void ff_er_frame_end(ERContext *s)
Definition: error_resilience.c:900
mpeg2_fast_decode_block_non_intra
static int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
Note: this function can read out of range and crash for corrupt streams.
Definition: mpeg12dec.c:403
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2164
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static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:597
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFrame::repeat_pict
int repeat_pict
When decoding, this signals how much the picture must be delayed.
Definition: frame.h:368
AV_STEREO3D_SIDEBYSIDE_QUINCUNX
Views are next to each other, but when upscaling apply a checkerboard pattern.
Definition: stereo3d.h:117
AVPacket::size
int size
Definition: avcodec.h:1446
MpegEncContext::codec_id
enum AVCodecID codec_id
Definition: mpegvideo.h:112
AV_EF_COMPLIANT
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2673
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void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:37
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static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1534
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const uint8_t * buffer
Definition: get_bits.h:62
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void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:115
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:1912
xvmc_internal.h
MB_TYPE_INTRA
#define MB_TYPE_INTRA
Definition: mpegutils.h:73
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AVCodec ff_mpeg1video_decoder
Definition: mpeg12dec.c:2871
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:130
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1743
tc
#define tc
Definition: regdef.h:69
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: mpegutils.h:55
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static av_cold int mpeg_decode_init(AVCodecContext *avctx)
Definition: mpeg12dec.c:1055
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#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2667
mpegvideo.h
mpegvideo header.
HAS_CBP
#define HAS_CBP(a)
Definition: mpegutils.h:101
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void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
AVDISCARD_ALL
discard all
Definition: avcodec.h:803
ScanTable::permutated
uint8_t permutated[64]
Definition: idctdsp.h:33
AV_STEREO3D_SIDEBYSIDE
Views are next to each other.
Definition: stereo3d.h:67
run
uint8_t run
Definition: svq3.c:206
HWACCEL_D3D11VA
#define HWACCEL_D3D11VA(codec)
Definition: hwaccel.h:79
ER_MV_ERROR
#define ER_MV_ERROR
Definition: error_resilience.h:33
mpeg_decode_gop
static void mpeg_decode_gop(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2418
SLICE_MIN_START_CODE
#define SLICE_MIN_START_CODE
Definition: mpegvideo.h:71
AVCodecContext::hwaccel
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2690
AVCodecContext::profile
int profile
profile
Definition: avcodec.h:2859
AVCodec
AVCodec.
Definition: avcodec.h:3424
get_dmv
static int get_dmv(MpegEncContext *s)
Definition: mpeg12dec.c:644
MpegEncContext::qscale
int qscale
QP.
Definition: mpegvideo.h:204
RLTable
RLTable.
Definition: rl.h:39
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:361
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
MpegEncContext::chroma_x_shift
int chroma_x_shift
Definition: mpegvideo.h:485
MpegEncContext::encoding
int encoding
true if we are encoding (vs decoding)
Definition: mpegvideo.h:114
MpegEncContext::field_select
int field_select[2][2]
Definition: mpegvideo.h:277
attributes.h
Macro definitions for various function/variable attributes.
AVCodecContext::skip_frame
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2991
block
static int16_t block[64]
Definition: dct.c:115
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: avcodec.h:993
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:99
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
ff_mpeg_draw_horiz_band
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:2265
MBINCR_VLC_BITS
#define MBINCR_VLC_BITS
Definition: mpeg12vlc.h:37
ptype2mb_type
static const uint32_t ptype2mb_type[7]
Definition: mpeg12dec.c:76
SLICE_MAX_START_CODE
#define SLICE_MAX_START_CODE
Definition: avs2_parser.c:24
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:82
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
ff_rl_mpeg2
RLTable ff_rl_mpeg2
Definition: mpeg12data.c:174
AVStereo3D
Stereo 3D type: this structure describes how two videos are packed within a single video surface...
Definition: stereo3d.h:176
MpegEncContext::out_format
enum OutputFormat out_format
output format
Definition: mpegvideo.h:104
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2615
end
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
ff_mpeg1_aspect
const float ff_mpeg1_aspect[16]
Definition: mpeg12data.c:374
thread.h
Multithreading support functions.
AV_CODEC_FLAG_LOW_DELAY
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:887
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:443
load_matrix
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
Definition: mpeg12dec.c:1497
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1634
MpegEncContext::full_pel
int full_pel[2]
Definition: mpegvideo.h:489
MpegEncContext::interlaced_dct
int interlaced_dct
Definition: mpegvideo.h:490
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: mpegutils.h:54
mpeg_get_pixelformat
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
Definition: mpeg12dec.c:1174
mpeg1_fast_decode_block_inter
static int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
Note: this function can read out of range and crash for corrupt streams.
Definition: mpeg12dec.c:227
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:87
MpegEncContext::current_picture
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:180
Mpeg1Context::first_slice
int first_slice
Definition: mpeg12dec.c:70
AV_FRAME_DATA_PANSCAN
The data is the AVPanScan struct defined in libavcodec.
Definition: frame.h:52
MpegEncContext::intra_dc_precision
int intra_dc_precision
Definition: mpegvideo.h:463
MpegEncContext::repeat_first_field
int repeat_first_field
Definition: mpegvideo.h:479
ff_xvmc_init_block
void ff_xvmc_init_block(MpegEncContext *s)
Initialize the block field of the MpegEncContext pointer passed as parameter after making sure that t...
Definition: mpegvideo_xvmc.c:43
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:188
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:287
PICT_BOTTOM_FIELD
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:38
height
#define height
AVPacket::data
uint8_t * data
Definition: avcodec.h:1445
HWACCEL_DXVA2
#define HWACCEL_DXVA2(codec)
Definition: hwaccel.h:67
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
ff_xvmc_pack_pblocks
void ff_xvmc_pack_pblocks(MpegEncContext *s, int cbp)
Fill individual block pointers, so there are no gaps in the data_block array in case not all blocks i...
Definition: mpegvideo_xvmc.c:64
ER_MV_END
#define ER_MV_END
Definition: error_resilience.h:36
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
ff_mpv_idct_init
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:330
MpegEncContext::mb_height
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:129
AVCodecContext::lowres
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:2765
AV_STEREO3D_2D
Video is not stereoscopic (and metadata has to be there).
Definition: stereo3d.h:55
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
MpegEncContext::codec_tag
int codec_tag
internal codec_tag upper case converted from avctx codec_tag
Definition: mpegvideo.h:120
ff_thread_finish_setup
void ff_thread_finish_setup(AVCodecContext *avctx)
If the codec defines update_thread_context(), call this when they are ready for the next thread to st...
Definition: pthread_frame.c:601
AV_CODEC_FLAG_GRAY
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:870
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:89
ff_mv_vlc
VLC ff_mv_vlc
Definition: mpeg12.c:127
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2171
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
avpriv_find_start_code
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:2730
MB_TYPE_QUANT
#define MB_TYPE_QUANT
Definition: mpegutils.h:70
setup_hwaccel_for_pixfmt
static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
Definition: mpeg12dec.c:1195
version.h
Libavcodec version macros.
AV_CODEC_ID_MPEG1VIDEO
Definition: avcodec.h:219
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:814
AVCodec::id
enum AVCodecID id
Definition: avcodec.h:3438
MpegEncContext::slice_context_count
int slice_context_count
number of used thread_contexts
Definition: mpegvideo.h:156
Mpeg1Context::extradata_decoded
int extradata_decoded
Definition: mpeg12dec.c:71
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
FF_IDCT_NONE
#define FF_IDCT_NONE
Definition: avcodec.h:2742
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVCodecContext::has_b_frames
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1823
MpegEncContext::last_dc
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:185
s2
#define s2
Definition: regdef.h:39
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:830
MT_FIELD
#define MT_FIELD
Definition: mpeg12dec.c:653
PTRDIFF_SPECIFIER
#define PTRDIFF_SPECIFIER
Definition: internal.h:261
MpegEncContext::mb_skipped
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:195
MpegEncContext::chroma_y_shift
int chroma_y_shift
Definition: mpegvideo.h:486
ff_combine_frame
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
Definition: parser.c:234
AVERROR
#define AVERROR(e)
Definition: error.h:43
mpeg_decode_sequence_extension
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1396
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:186
MpegEncContext::er
ERContext er
Definition: mpegvideo.h:565
mpeg1_decode_block_inter
static int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:137
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:2804
ff_mpegvideo_decoder
AVCodec ff_mpegvideo_decoder
Definition: mpeg12dec.c:2950
MB_TYPE_CBP
#define MB_TYPE_CBP
Definition: mpegutils.h:71
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
AV_FRAME_DATA_A53_CC
ATSC A53 Part 4 Closed Captions.
Definition: frame.h:58
arg
const char * arg
Definition: jacosubdec.c:66
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1613
wrap
#define wrap(func)
Definition: neontest.h:65
SEQ_END_CODE
#define SEQ_END_CODE
Definition: mpegvideo.h:67
PICT_TOP_FIELD
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3431
mpeg_decode_motion
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
Definition: mpeg12dec.c:101
AVPanScan::width
int width
width and height in 1/16 pel
Definition: avcodec.h:1092
MpegEncContext::low_delay
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:406
mpeg_decode_user_data
static void mpeg_decode_user_data(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2348
MpegEncContext::gb
GetBitContext gb
Definition: mpegvideo.h:448
AV_FRAME_DATA_GOP_TIMECODE
The GOP timecode in 25 bit timecode format.
Definition: frame.h:124
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
ff_mpv_common_end
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1131
ff_mb_pat_vlc
VLC ff_mb_pat_vlc
Definition: mpeg12.c:135
FFMAX
#define FFMAX(a, b)
Definition: common.h:94
decode_dc
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12.h:41
Mpeg1Context::repeat_field
int repeat_field
Definition: mpeg12dec.c:56
AVCodecContext::timecode_frame_start
attribute_deprecated int64_t timecode_frame_start
Definition: avcodec.h:2491
DECODE_SLICE_ERROR
#define DECODE_SLICE_ERROR
Definition: mpeg12dec.c:1692
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:703
DECODE_SLICE_OK
#define DECODE_SLICE_OK
Definition: mpeg12dec.c:1693
AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2305
AV_PIX_FMT_XVMC
XVideo Motion Acceleration via common packet passing.
Definition: pixfmt.h:273
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:193
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:225
MpegEncContext::resync_mb_x
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:356
AVCodecContext::rc_buffer_size
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2392
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:33
internal.h
common internal API header
ER_AC_ERROR
#define ER_AC_ERROR
Definition: error_resilience.h:31
mpeg_field_start
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:1593
MpegEncContext::intra_vlc_format
int intra_vlc_format
Definition: mpegvideo.h:469
ff_mpeg2_video_profiles
const AVProfile ff_mpeg2_video_profiles[]
Definition: profiles.c:94
AV_CODEC_CAP_DRAW_HORIZ_BAND
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:962
mpeg2_decode_block_non_intra
static int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:312
ff_mpv_export_qp_table
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:1444
MpegEncContext::progressive_frame
int progressive_frame
Definition: mpegvideo.h:488
AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:309
MB_PAT_VLC_BITS
#define MB_PAT_VLC_BITS
Definition: mpeg12vlc.h:38
MpegEncContext::top_field_first
int top_field_first
Definition: mpegvideo.h:465
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2658
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:2796
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
ParseContext::last_index
int last_index
Definition: parser.h:31
vcr2_init_sequence
static int vcr2_init_sequence(AVCodecContext *avctx)
Definition: mpeg12dec.c:2169
width
#define width
MpegEncContext::mbskip_table
uint8_t * mbskip_table
used to avoid copy if macroblock skipped (for black regions for example) and used for B-frame encodin...
Definition: mpegvideo.h:196
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2729
w
uint8_t w
Definition: llviddspenc.c:38
Picture::motion_val
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
MpegEncContext::current_picture_ptr
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:184
ff_mpeg_er_frame_start
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:46
ER_DC_END
#define ER_DC_END
Definition: error_resilience.h:35
mpeg_decode_a53_cc
static int mpeg_decode_a53_cc(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2223
ff_rl_mpeg1
RLTable ff_rl_mpeg1
Definition: mpeg12data.c:166
AVCHROMA_LOC_TOPLEFT
ITU-R 601, SMPTE 274M 296M S314M(DV 4:1:1), mpeg2 4:2:2.
Definition: pixfmt.h:535
MpegEncContext::alternate_scan
int alternate_scan
Definition: mpegvideo.h:470
Mpeg1Context::save_height
int save_height
Definition: mpeg12dec.c:66
MB_BTYPE_VLC_BITS
#define MB_BTYPE_VLC_BITS
Definition: mpeg12vlc.h:40
GOP_START_CODE
#define GOP_START_CODE
Definition: mpegvideo.h:69
int32_t
int32_t
Definition: audio_convert.c:194
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:2143
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:443
Mpeg1Context::a53_caption_size
int a53_caption_size
Definition: mpeg12dec.c:61
s
#define s(width, name)
Definition: cbs_vp9.c:257
FF_THREAD_SLICE
#define FF_THREAD_SLICE
Decode more than one part of a single frame at once.
Definition: avcodec.h:2797
AVCodecContext::level
int level
level
Definition: avcodec.h:2969
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
mpeg_decode_end
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
Definition: mpeg12dec.c:2861
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:762
mpeg_decode_quant_matrix_extension
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
Definition: mpeg12dec.c:1520
MpegEncContext::pblocks
int16_t(*[12] pblocks)[64]
Definition: mpegvideo.h:505
MpegEncContext::block_last_index
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:86
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2669
n
int n
Definition: avisynth_c.h:684
IDCTDSPContext::idct_permutation
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
AVCodecContext::ticks_per_frame
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1665
MpegEncContext::mpeg_f_code
int mpeg_f_code[2][2]
Definition: mpegvideo.h:457
EXT_START_CODE
#define EXT_START_CODE
Definition: cavs.h:33
Mpeg1Context::mpeg_enc_ctx_allocated
int mpeg_enc_ctx_allocated
Definition: mpeg12dec.c:55
check_scantable_index
#define check_scantable_index(ctx, x)
Definition: mpeg12dec.c:128
MB_TYPE_INTERLACED
#define MB_TYPE_INTERLACED
Definition: mpegutils.h:58
AV_PIX_FMT_CUDA
HW acceleration through CUDA.
Definition: pixfmt.h:235
ff_mpeg_update_thread_context
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:495
AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:220
RLTable::rl_vlc
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
ff_mpv_decode_defaults
void ff_mpv_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:669
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:2785
mpeg1_decode_sequence
static int mpeg1_decode_sequence(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2080
pred
static const float pred[4]
Definition: siprdata.h:259
Mpeg1Context::save_aspect
AVRational save_aspect
Definition: mpeg12dec.c:65
MpegEncContext::first_field
int first_field
is 1 for the first field of a field picture 0 otherwise
Definition: mpegvideo.h:491
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: avcodec.h:1028
Mpeg1Context::save_width
int save_width
Definition: mpeg12dec.c:66
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
MV_VLC_BITS
#define MV_VLC_BITS
Definition: ituh263dec.c:54
MpegEncContext::frame_pred_frame_dct
int frame_pred_frame_dct
Definition: mpegvideo.h:464
mpeg2_decode_block_intra
static int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:475
AVStereo3D::type
enum AVStereo3DType type
How views are packed within the video.
Definition: stereo3d.h:180
MpegEncContext::inter_matrix
uint16_t inter_matrix[64]
Definition: mpegvideo.h:302
ParseContext::buffer
uint8_t * buffer
Definition: parser.h:29
mpeg2_hwaccel_pixfmt_list_420
static enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[]
Definition: mpeg12dec.c:1137
MpegEncContext::concealment_motion_vectors
int concealment_motion_vectors
Definition: mpegvideo.h:466
MpegEncContext::thread_context
struct MpegEncContext * thread_context[MAX_THREADS]
Definition: mpegvideo.h:155
avcodec.h
Libavcodec external API header.
AV_STEREO3D_TOPBOTTOM
Views are on top of each other.
Definition: stereo3d.h:79
Mpeg1Context::frame_rate_ext
AVRational frame_rate_ext
Definition: mpeg12dec.c:67
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1543
MpegEncContext::bdsp
BlockDSPContext bdsp
Definition: mpegvideo.h:226
mpeg2_fast_decode_block_intra
static int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
Note: this function can read out of range and crash for corrupt streams.
Definition: mpeg12dec.c:565
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:257
AV_CODEC_FLAG2_FAST
#define AV_CODEC_FLAG2_FAST
Allow non spec compliant speedup tricks.
Definition: avcodec.h:910
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:2614
error_resilience.h
MB_PTYPE_VLC_BITS
#define MB_PTYPE_VLC_BITS
Definition: mpeg12vlc.h:39
AVCodecContext
main external API structure.
Definition: avcodec.h:1533
mpeg_er.h
MpegEncContext::intra_scantable
ScanTable intra_scantable
Definition: mpegvideo.h:91
USER_START_CODE
#define USER_START_CODE
Definition: cavs.h:34
MpegEncContext::height
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:100
IS_QUANT
#define IS_QUANT(a)
Definition: mpegutils.h:95
mpeg12data.h
MPEG-1/2 tables.
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1558
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
AVFrameSideData::data
uint8_t * data
Definition: frame.h:190
MV_TYPE_16X8
#define MV_TYPE_16X8
2 vectors, one per 16x8 block
Definition: mpegvideo.h:268
MpegEncContext::chroma_420_type
int chroma_420_type
Definition: mpegvideo.h:480
buf
void * buf
Definition: avisynth_c.h:690
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:1701
ff_print_debug_info
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:1437
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:1635
MpegEncContext::progressive_sequence
int progressive_sequence
Definition: mpegvideo.h:456
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:487
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:523
AVCodecContext::slice_flags
int slice_flags
slice flags
Definition: avcodec.h:2011
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:1721
FF_CODEC_PROPERTY_CLOSED_CAPTIONS
#define FF_CODEC_PROPERTY_CLOSED_CAPTIONS
Definition: avcodec.h:3180
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:460
profiles
static const AVProfile profiles[]
Definition: libfdk-aacenc.c:426
av_frame_new_side_data
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, int size)
Add a new side data to a frame.
Definition: frame.c:722
MpegEncContext::closed_gop
int closed_gop
MPEG1/2 GOP is closed.
Definition: mpegvideo.h:211
Mpeg1Context::has_stereo3d
int has_stereo3d
Definition: mpeg12dec.c:59
ff_mb_ptype_vlc
VLC ff_mb_ptype_vlc
Definition: mpeg12.c:133
avpriv_toupper4
unsigned int avpriv_toupper4(unsigned int x)
Definition: utils.c:1786
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:2157
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:2150
Picture::f
struct AVFrame * f
Definition: mpegpicture.h:46
HWACCEL_XVMC
#define HWACCEL_XVMC(codec)
Definition: hwaccel.h:81
AV_PIX_FMT_VDPAU
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:197
mpeg12_pixfmt_list_422
static enum AVPixelFormat mpeg12_pixfmt_list_422[]
Definition: mpeg12dec.c:1164
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:615
GET_CACHE
#define GET_CACHE(name, gb)
Definition: get_bits.h:215
ff_mpeg1_default_intra_matrix
const uint16_t ff_mpeg1_default_intra_matrix[256]
Definition: mpeg12data.c:30
ff_mpeg1_find_frame_end
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
Find the end of the current frame in the bitstream.
Definition: mpeg12.c:178
Mpeg1Context::save_progressive_seq
int save_progressive_seq
Definition: mpeg12dec.c:66
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
MT_DMV
#define MT_DMV
Definition: mpeg12dec.c:656
ff_thread_get_format
enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Wrapper around get_format() for frame-multithreaded codecs.
Definition: pthread_frame.c:938
s1
#define s1
Definition: regdef.h:38
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.c:1205
ER_DC_ERROR
#define ER_DC_ERROR
Definition: error_resilience.h:32
MB_TYPE_SKIP
#define MB_TYPE_SKIP
Definition: mpegutils.h:62
AV_PIX_FMT_DXVA2_VLD
HW decoding through DXVA2, Picture.data[3] contains a LPDIRECT3DSURFACE9 pointer. ...
Definition: pixfmt.h:137
mpeg_decode_frame
static int mpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_output, AVPacket *avpkt)
Definition: mpeg12dec.c:2777
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
decode_chunks
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture, int *got_output, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2451
MpegEncContext::pict_type
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:212
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
ff_mpeg12_common_init
av_cold void ff_mpeg12_common_init(MpegEncContext *s)
Definition: mpeg12.c:107
AV_CODEC_CAP_TRUNCATED
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:969
sign_extend
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
HWACCEL_VAAPI
#define HWACCEL_VAAPI(codec)
Definition: hwaccel.h:73
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:553
AVCodecContext::skip_bottom
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:2069
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:596
AVPanScan
Pan Scan area.
Definition: avcodec.h:1079
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:240
level
uint8_t level
Definition: svq3.c:207
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
MpegEncContext::mv
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:276
FF_QSCALE_TYPE_MPEG2
#define FF_QSCALE_TYPE_MPEG2
Definition: internal.h:82
MpegEncContext::b8_stride
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:131
AV_PIX_FMT_D3D11
Hardware surfaces for Direct3D11.
Definition: pixfmt.h:313
AVCOL_RANGE_MPEG
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:511
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:81
MpegEncContext::next_picture_ptr
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:183
MpegEncContext::avctx
struct AVCodecContext * avctx
Definition: mpegvideo.h:98
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
av_cmp_q
static int av_cmp_q(AVRational a, AVRational b)
Compare two rationals.
Definition: rational.h:89
ff_mpeg1_decode_block_intra
int ff_mpeg1_decode_block_intra(GetBitContext *gb, const uint16_t *quant_matrix, uint8_t *const scantable, int last_dc[3], int16_t *block, int index, int qscale)
Definition: mpeg12.c:240
AVDISCARD_NONREF
discard all non reference
Definition: avcodec.h:799
ff_mpeg2_aspect
const AVRational ff_mpeg2_aspect[16]
Definition: mpeg12data.c:395
mpeg1_hwaccel_pixfmt_list_420
static enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[]
Definition: mpeg12dec.c:1123
AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
MB_TYPE_L0L1
#define MB_TYPE_L0L1
Definition: mpegutils.h:69
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
internal.h
common internal api header.
MpegEncContext::mb_stride
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:130
ff_mpv_decode_init
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Definition: mpegvideo.c:674
if
if(ret< 0)
Definition: vf_mcdeint.c:279
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
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: internal.h:60
ff_mpeg2video_decoder
AVCodec ff_mpeg2video_decoder
Definition: mpeg12dec.c:2904
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dv.h:96
mpeg_decode_mb
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpeg12dec.c:658
MpegEncContext::dest
uint8_t * dest[3]
Definition: mpegvideo.h:295
c
static double c[64]
Definition: vsrc_mptestsrc.c:87
GetBitContext::buffer_end
const uint8_t * buffer_end
Definition: get_bits.h:62
flush
static void flush(AVCodecContext *avctx)
Definition: mpeg12dec.c:2852
ff_mbincr_vlc
VLC ff_mbincr_vlc
Definition: mpeg12.c:132
MpegEncContext::last_picture_ptr
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:182
AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
stereo3d.h
Stereoscopic video.
mpeg1_decode_picture
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:1349
AVCodecContext::properties
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:3178
AVRational::den
int den
Denominator.
Definition: rational.h:60
ff_alternate_vertical_scan
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:100
ff_update_duplicate_context
int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src)
Definition: mpegvideo.c:467
Mpeg1Context::stereo3d
AVStereo3D stereo3d
Definition: mpeg12dec.c:58
lowres
static int lowres
Definition: ffplay.c:334
IS_INTRA
#define IS_INTRA(x, y)
slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2029
AVPanScan::position
int16_t position[3][2]
position of the top left corner in 1/16 pel for up to 3 fields/frames
Definition: avcodec.h:1100
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1560
PICT_FRAME
#define PICT_FRAME
Definition: mpegutils.h:39
MpegEncContext::frame_rate_index
int frame_rate_index
Definition: mpegvideo.h:217
ff_mpv_common_init
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:892
mpeg_decode_postinit
static int mpeg_decode_postinit(AVCodecContext *avctx)
Definition: mpeg12dec.c:1212
diff
static av_always_inline int diff(const uint32_t a, const uint32_t b)
Definition: vf_palettegen.c:136
MpegEncContext::picture_structure
int picture_structure
Definition: mpegvideo.h:460
ff_init_scantable
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
FF_DEBUG_STARTCODE
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2628
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:2825
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
ff_mpv_frame_end
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1429
MT_FRAME
#define MT_FRAME
Definition: mpeg12dec.c:654
MV_TYPE_DMV
#define MV_TYPE_DMV
2 vectors, special mpeg2 Dual Prime Vectors
Definition: mpegvideo.h:270
ff_mpv_reconstruct_mb
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2253
SEQ_START_CODE
#define SEQ_START_CODE
Definition: mpegvideo.h:68
MpegEncContext::resync_mb_y
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:357
MpegEncContext::block
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:507
MpegEncContext::parse_context
ParseContext parse_context
Definition: mpegvideo.h:362
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
MpegEncContext::bit_rate
int64_t bit_rate
wanted bit rate
Definition: mpegvideo.h:103
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:304
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:658
AVCodecContext::flags2
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1620
Mpeg1Context::mpeg_enc_ctx
MpegEncContext mpeg_enc_ctx
Definition: mpeg12dec.c:54
Mpeg1Context::slice_count
int slice_count
Definition: mpeg12dec.c:64
dc
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
Definition: audio_convert.c:194
ERContext::error_count
atomic_int error_count
Definition: error_resilience.h:64
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
MB_TYPE_ZERO_MV
#define MB_TYPE_ZERO_MV
Definition: mpeg12dec.c:74
AV_CODEC_FLAG_TRUNCATED
#define AV_CODEC_FLAG_TRUNCATED
Input bitstream might be truncated at a random location instead of only at frame boundaries.
Definition: avcodec.h:879
AV_CODEC_FLAG2_SHOW_ALL
#define AV_CODEC_FLAG2_SHOW_ALL
Show all frames before the first keyframe.
Definition: avcodec.h:938
MpegEncContext::intra_matrix
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:300
Picture::mb_type
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
HWACCEL_VDPAU
#define HWACCEL_VDPAU(codec)
Definition: hwaccel.h:75
MpegEncContext::inter_scantable
ScanTable inter_scantable
if inter == intra then intra should be used to reduce the cache usage
Definition: mpegvideo.h:90
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
PICTURE_START_CODE
#define PICTURE_START_CODE
Definition: mpegvideo.h:70
skip_1stop_8data_bits
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:819
start_code
static const uint8_t start_code[]
Definition: videotoolboxenc.c:168
AV_PIX_FMT_D3D11VA_VLD
HW decoding through Direct3D11 via old API, Picture.data[3] contains a ID3D11VideoDecoderOutputView p...
Definition: pixfmt.h:229
AVCHROMA_LOC_CENTER
MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0.
Definition: pixfmt.h:534
ER_AC_END
#define ER_AC_END
Definition: error_resilience.h:34
mpeg_get_qscale
static int mpeg_get_qscale(MpegEncContext *s)
Definition: mpegvideo.h:759
AVHWAccel::decode_slice
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3682
slice_decode_thread
static int slice_decode_thread(AVCodecContext *c, void *arg)
Definition: mpeg12dec.c:1978
AVHWAccel::end_frame
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3693
mpeg12_pixfmt_list_444
static enum AVPixelFormat mpeg12_pixfmt_list_444[]
Definition: mpeg12dec.c:1169
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1422
ff_mpv_report_decode_progress
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2350
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:968
MB_TYPE_L0
#define MB_TYPE_L0
Definition: mpegutils.h:67
mpeg_decode_picture_display_extension
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1463
AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
AV_TIMECODE_STR_SIZE
#define AV_TIMECODE_STR_SIZE
Definition: timecode.h:33
AVCodecContext::rc_max_rate
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:2407
ff_mpeg12_frame_rate_tab
const AVRational ff_mpeg12_frame_rate_tab[]
Definition: mpeg12framerate.c:24
Mpeg1Context::pan_scan
AVPanScan pan_scan
Definition: mpeg12dec.c:57
ff_mb_btype_vlc
VLC ff_mb_btype_vlc
Definition: mpeg12.c:134
Generated on Tue Nov 6 2018 18:11:10 for FFmpeg by   doxygen 1.8.6