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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 "idctdsp.h"
40 #include "internal.h"
41 #include "mpeg_er.h"
42 #include "mpeg12.h"
43 #include "mpeg12data.h"
44 #include "mpegutils.h"
45 #include "mpegvideo.h"
46 #include "mpegvideodata.h"
47 #include "profiles.h"
48 #include "thread.h"
49 #include "version.h"
50 #include "vdpau_compat.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 << (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 static inline int get_qscale(MpegEncContext *s)
653 {
654  int qscale = get_bits(&s->gb, 5);
655  if (s->q_scale_type)
656  return ff_mpeg2_non_linear_qscale[qscale];
657  else
658  return qscale << 1;
659 }
660 
661 
662 /* motion type (for MPEG-2) */
663 #define MT_FIELD 1
664 #define MT_FRAME 2
665 #define MT_16X8 2
666 #define MT_DMV 3
667 
668 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
669 {
670  int i, j, k, cbp, val, mb_type, motion_type;
671  const int mb_block_count = 4 + (1 << s->chroma_format);
672  int ret;
673 
674  ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
675 
676  av_assert2(s->mb_skipped == 0);
677 
678  if (s->mb_skip_run-- != 0) {
679  if (s->pict_type == AV_PICTURE_TYPE_P) {
680  s->mb_skipped = 1;
681  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
682  MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
683  } else {
684  int mb_type;
685 
686  if (s->mb_x)
687  mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
688  else
689  // FIXME not sure if this is allowed in MPEG at all
690  mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
691  if (IS_INTRA(mb_type)) {
692  av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
693  return AVERROR_INVALIDDATA;
694  }
695  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
696  mb_type | MB_TYPE_SKIP;
697 
698  if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
699  s->mb_skipped = 1;
700  }
701 
702  return 0;
703  }
704 
705  switch (s->pict_type) {
706  default:
707  case AV_PICTURE_TYPE_I:
708  if (get_bits1(&s->gb) == 0) {
709  if (get_bits1(&s->gb) == 0) {
710  av_log(s->avctx, AV_LOG_ERROR,
711  "Invalid mb type in I-frame at %d %d\n",
712  s->mb_x, s->mb_y);
713  return AVERROR_INVALIDDATA;
714  }
715  mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
716  } else {
717  mb_type = MB_TYPE_INTRA;
718  }
719  break;
720  case AV_PICTURE_TYPE_P:
721  mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
722  if (mb_type < 0) {
723  av_log(s->avctx, AV_LOG_ERROR,
724  "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
725  return AVERROR_INVALIDDATA;
726  }
727  mb_type = ptype2mb_type[mb_type];
728  break;
729  case AV_PICTURE_TYPE_B:
730  mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
731  if (mb_type < 0) {
732  av_log(s->avctx, AV_LOG_ERROR,
733  "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
734  return AVERROR_INVALIDDATA;
735  }
736  mb_type = btype2mb_type[mb_type];
737  break;
738  }
739  ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
740 // motion_type = 0; /* avoid warning */
741  if (IS_INTRA(mb_type)) {
742  s->bdsp.clear_blocks(s->block[0]);
743 
744  if (!s->chroma_y_shift)
745  s->bdsp.clear_blocks(s->block[6]);
746 
747  /* compute DCT type */
748  // FIXME: add an interlaced_dct coded var?
749  if (s->picture_structure == PICT_FRAME &&
750  !s->frame_pred_frame_dct)
751  s->interlaced_dct = get_bits1(&s->gb);
752 
753  if (IS_QUANT(mb_type))
754  s->qscale = get_qscale(s);
755 
756  if (s->concealment_motion_vectors) {
757  /* just parse them */
758  if (s->picture_structure != PICT_FRAME)
759  skip_bits1(&s->gb); /* field select */
760 
761  s->mv[0][0][0] =
762  s->last_mv[0][0][0] =
763  s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
764  s->last_mv[0][0][0]);
765  s->mv[0][0][1] =
766  s->last_mv[0][0][1] =
767  s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
768  s->last_mv[0][0][1]);
769 
770  check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
771  } else {
772  /* reset mv prediction */
773  memset(s->last_mv, 0, sizeof(s->last_mv));
774  }
775  s->mb_intra = 1;
776  // if 1, we memcpy blocks in xvmcvideo
777  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
778  ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
779 
780  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
781  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
782  for (i = 0; i < 6; i++)
783  mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
784  } else {
785  for (i = 0; i < mb_block_count; i++)
786  if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
787  return ret;
788  }
789  } else {
790  for (i = 0; i < 6; i++) {
791  ret = ff_mpeg1_decode_block_intra(&s->gb,
792  s->intra_matrix,
793  s->intra_scantable.permutated,
794  s->last_dc, *s->pblocks[i],
795  i, s->qscale);
796  if (ret < 0) {
797  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
798  s->mb_x, s->mb_y);
799  return ret;
800  }
801 
802  s->block_last_index[i] = ret;
803  }
804  }
805  } else {
806  if (mb_type & MB_TYPE_ZERO_MV) {
807  av_assert2(mb_type & MB_TYPE_CBP);
808 
809  s->mv_dir = MV_DIR_FORWARD;
810  if (s->picture_structure == PICT_FRAME) {
811  if (s->picture_structure == PICT_FRAME
812  && !s->frame_pred_frame_dct)
813  s->interlaced_dct = get_bits1(&s->gb);
814  s->mv_type = MV_TYPE_16X16;
815  } else {
816  s->mv_type = MV_TYPE_FIELD;
817  mb_type |= MB_TYPE_INTERLACED;
818  s->field_select[0][0] = s->picture_structure - 1;
819  }
820 
821  if (IS_QUANT(mb_type))
822  s->qscale = get_qscale(s);
823 
824  s->last_mv[0][0][0] = 0;
825  s->last_mv[0][0][1] = 0;
826  s->last_mv[0][1][0] = 0;
827  s->last_mv[0][1][1] = 0;
828  s->mv[0][0][0] = 0;
829  s->mv[0][0][1] = 0;
830  } else {
831  av_assert2(mb_type & MB_TYPE_L0L1);
832  // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
833  /* get additional motion vector type */
834  if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
835  motion_type = MT_FRAME;
836  } else {
837  motion_type = get_bits(&s->gb, 2);
838  if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
839  s->interlaced_dct = get_bits1(&s->gb);
840  }
841 
842  if (IS_QUANT(mb_type))
843  s->qscale = get_qscale(s);
844 
845  /* motion vectors */
846  s->mv_dir = (mb_type >> 13) & 3;
847  ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
848  switch (motion_type) {
849  case MT_FRAME: /* or MT_16X8 */
850  if (s->picture_structure == PICT_FRAME) {
851  mb_type |= MB_TYPE_16x16;
852  s->mv_type = MV_TYPE_16X16;
853  for (i = 0; i < 2; i++) {
854  if (USES_LIST(mb_type, i)) {
855  /* MT_FRAME */
856  s->mv[i][0][0] =
857  s->last_mv[i][0][0] =
858  s->last_mv[i][1][0] =
859  mpeg_decode_motion(s, s->mpeg_f_code[i][0],
860  s->last_mv[i][0][0]);
861  s->mv[i][0][1] =
862  s->last_mv[i][0][1] =
863  s->last_mv[i][1][1] =
864  mpeg_decode_motion(s, s->mpeg_f_code[i][1],
865  s->last_mv[i][0][1]);
866  /* full_pel: only for MPEG-1 */
867  if (s->full_pel[i]) {
868  s->mv[i][0][0] <<= 1;
869  s->mv[i][0][1] <<= 1;
870  }
871  }
872  }
873  } else {
874  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
875  s->mv_type = MV_TYPE_16X8;
876  for (i = 0; i < 2; i++) {
877  if (USES_LIST(mb_type, i)) {
878  /* MT_16X8 */
879  for (j = 0; j < 2; j++) {
880  s->field_select[i][j] = get_bits1(&s->gb);
881  for (k = 0; k < 2; k++) {
882  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
883  s->last_mv[i][j][k]);
884  s->last_mv[i][j][k] = val;
885  s->mv[i][j][k] = val;
886  }
887  }
888  }
889  }
890  }
891  break;
892  case MT_FIELD:
893  s->mv_type = MV_TYPE_FIELD;
894  if (s->picture_structure == PICT_FRAME) {
895  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
896  for (i = 0; i < 2; i++) {
897  if (USES_LIST(mb_type, i)) {
898  for (j = 0; j < 2; j++) {
899  s->field_select[i][j] = get_bits1(&s->gb);
900  val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
901  s->last_mv[i][j][0]);
902  s->last_mv[i][j][0] = val;
903  s->mv[i][j][0] = val;
904  ff_tlog(s->avctx, "fmx=%d\n", val);
905  val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
906  s->last_mv[i][j][1] >> 1);
907  s->last_mv[i][j][1] = 2 * val;
908  s->mv[i][j][1] = val;
909  ff_tlog(s->avctx, "fmy=%d\n", val);
910  }
911  }
912  }
913  } else {
914  av_assert0(!s->progressive_sequence);
915  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
916  for (i = 0; i < 2; i++) {
917  if (USES_LIST(mb_type, i)) {
918  s->field_select[i][0] = get_bits1(&s->gb);
919  for (k = 0; k < 2; k++) {
920  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
921  s->last_mv[i][0][k]);
922  s->last_mv[i][0][k] = val;
923  s->last_mv[i][1][k] = val;
924  s->mv[i][0][k] = val;
925  }
926  }
927  }
928  }
929  break;
930  case MT_DMV:
931  if (s->progressive_sequence){
932  av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
933  return AVERROR_INVALIDDATA;
934  }
935  s->mv_type = MV_TYPE_DMV;
936  for (i = 0; i < 2; i++) {
937  if (USES_LIST(mb_type, i)) {
938  int dmx, dmy, mx, my, m;
939  const int my_shift = s->picture_structure == PICT_FRAME;
940 
941  mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
942  s->last_mv[i][0][0]);
943  s->last_mv[i][0][0] = mx;
944  s->last_mv[i][1][0] = mx;
945  dmx = get_dmv(s);
946  my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
947  s->last_mv[i][0][1] >> my_shift);
948  dmy = get_dmv(s);
949 
950 
951  s->last_mv[i][0][1] = my << my_shift;
952  s->last_mv[i][1][1] = my << my_shift;
953 
954  s->mv[i][0][0] = mx;
955  s->mv[i][0][1] = my;
956  s->mv[i][1][0] = mx; // not used
957  s->mv[i][1][1] = my; // not used
958 
959  if (s->picture_structure == PICT_FRAME) {
960  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
961 
962  // m = 1 + 2 * s->top_field_first;
963  m = s->top_field_first ? 1 : 3;
964 
965  /* top -> top pred */
966  s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
967  s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
968  m = 4 - m;
969  s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
970  s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
971  } else {
972  mb_type |= MB_TYPE_16x16;
973 
974  s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
975  s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
976  if (s->picture_structure == PICT_TOP_FIELD)
977  s->mv[i][2][1]--;
978  else
979  s->mv[i][2][1]++;
980  }
981  }
982  }
983  break;
984  default:
985  av_log(s->avctx, AV_LOG_ERROR,
986  "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
987  return AVERROR_INVALIDDATA;
988  }
989  }
990 
991  s->mb_intra = 0;
992  if (HAS_CBP(mb_type)) {
993  s->bdsp.clear_blocks(s->block[0]);
994 
995  cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
996  if (mb_block_count > 6) {
997  cbp <<= mb_block_count - 6;
998  cbp |= get_bits(&s->gb, mb_block_count - 6);
999  s->bdsp.clear_blocks(s->block[6]);
1000  }
1001  if (cbp <= 0) {
1002  av_log(s->avctx, AV_LOG_ERROR,
1003  "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1004  return AVERROR_INVALIDDATA;
1005  }
1006 
1007  // if 1, we memcpy blocks in xvmcvideo
1008  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1009  ff_xvmc_pack_pblocks(s, cbp);
1010 
1011  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1012  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1013  for (i = 0; i < 6; i++) {
1014  if (cbp & 32)
1015  mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1016  else
1017  s->block_last_index[i] = -1;
1018  cbp += cbp;
1019  }
1020  } else {
1021  cbp <<= 12 - mb_block_count;
1022 
1023  for (i = 0; i < mb_block_count; i++) {
1024  if (cbp & (1 << 11)) {
1025  if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1026  return ret;
1027  } else {
1028  s->block_last_index[i] = -1;
1029  }
1030  cbp += cbp;
1031  }
1032  }
1033  } else {
1034  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1035  for (i = 0; i < 6; i++) {
1036  if (cbp & 32)
1037  mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1038  else
1039  s->block_last_index[i] = -1;
1040  cbp += cbp;
1041  }
1042  } else {
1043  for (i = 0; i < 6; i++) {
1044  if (cbp & 32) {
1045  if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1046  return ret;
1047  } else {
1048  s->block_last_index[i] = -1;
1049  }
1050  cbp += cbp;
1051  }
1052  }
1053  }
1054  } else {
1055  for (i = 0; i < 12; i++)
1056  s->block_last_index[i] = -1;
1057  }
1058  }
1059 
1060  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1061 
1062  return 0;
1063 }
1064 
1065 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1066 {
1067  Mpeg1Context *s = avctx->priv_data;
1068  MpegEncContext *s2 = &s->mpeg_enc_ctx;
1069 
1070  ff_mpv_decode_defaults(s2);
1071 
1072  if ( avctx->codec_tag != AV_RL32("VCR2")
1073  && avctx->codec_tag != AV_RL32("BW10"))
1074  avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1075  ff_mpv_decode_init(s2, avctx);
1076 
1077  s->mpeg_enc_ctx.avctx = avctx;
1078 
1079  /* we need some permutation to store matrices,
1080  * until the decoder sets the real permutation. */
1081  ff_mpv_idct_init(s2);
1082  ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1083  ff_mpeg12_init_vlcs();
1084 
1085  s2->chroma_format = 1;
1086  s->mpeg_enc_ctx_allocated = 0;
1087  s->mpeg_enc_ctx.picture_number = 0;
1088  s->repeat_field = 0;
1089  s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1090  avctx->color_range = AVCOL_RANGE_MPEG;
1091  return 0;
1092 }
1093 
1094 #if HAVE_THREADS
1095 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1096  const AVCodecContext *avctx_from)
1097 {
1098  Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1099  MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1100  int err;
1101 
1102  if (avctx == avctx_from ||
1103  !ctx_from->mpeg_enc_ctx_allocated ||
1104  !s1->context_initialized)
1105  return 0;
1106 
1107  err = ff_mpeg_update_thread_context(avctx, avctx_from);
1108  if (err)
1109  return err;
1110 
1111  if (!ctx->mpeg_enc_ctx_allocated)
1112  memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1113 
1114  if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1115  s->picture_number++;
1116 
1117  return 0;
1118 }
1119 #endif
1120 
1121 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1122  const uint8_t *new_perm)
1123 {
1124  uint16_t temp_matrix[64];
1125  int i;
1126 
1127  memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1128 
1129  for (i = 0; i < 64; i++)
1130  matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1131 }
1132 
1133 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1134 #if CONFIG_MPEG1_XVMC_HWACCEL
1135  AV_PIX_FMT_XVMC,
1136 #endif
1137 #if CONFIG_MPEG1_VDPAU_DECODER && FF_API_VDPAU
1138  AV_PIX_FMT_VDPAU_MPEG1,
1139 #endif
1140 #if CONFIG_MPEG1_VDPAU_HWACCEL
1141  AV_PIX_FMT_VDPAU,
1142 #endif
1143  AV_PIX_FMT_YUV420P,
1144  AV_PIX_FMT_NONE
1145 };
1146 
1147 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1148 #if CONFIG_MPEG2_XVMC_HWACCEL
1149  AV_PIX_FMT_XVMC,
1150 #endif
1151 #if CONFIG_MPEG_VDPAU_DECODER && FF_API_VDPAU
1152  AV_PIX_FMT_VDPAU_MPEG2,
1153 #endif
1154 #if CONFIG_MPEG2_VDPAU_HWACCEL
1155  AV_PIX_FMT_VDPAU,
1156 #endif
1157 #if CONFIG_MPEG2_DXVA2_HWACCEL
1158  AV_PIX_FMT_DXVA2_VLD,
1159 #endif
1160 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1161  AV_PIX_FMT_D3D11VA_VLD,
1162 #endif
1163 #if CONFIG_MPEG2_VAAPI_HWACCEL
1164  AV_PIX_FMT_VAAPI,
1165 #endif
1166 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1167  AV_PIX_FMT_VIDEOTOOLBOX,
1168 #endif
1169  AV_PIX_FMT_YUV420P,
1170  AV_PIX_FMT_NONE
1171 };
1172 
1173 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1174  AV_PIX_FMT_YUV422P,
1175  AV_PIX_FMT_NONE
1176 };
1177 
1178 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1179  AV_PIX_FMT_YUV444P,
1180  AV_PIX_FMT_NONE
1181 };
1182 
1183 #if FF_API_VDPAU
1184 static inline int uses_vdpau(AVCodecContext *avctx) {
1185  return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1186 }
1187 #endif
1188 
1189 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1190 {
1191  Mpeg1Context *s1 = avctx->priv_data;
1192  MpegEncContext *s = &s1->mpeg_enc_ctx;
1193  const enum AVPixelFormat *pix_fmts;
1194 
1195  if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1196  return AV_PIX_FMT_GRAY8;
1197 
1198  if (s->chroma_format < 2)
1199  pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1200  mpeg1_hwaccel_pixfmt_list_420 :
1201  mpeg2_hwaccel_pixfmt_list_420;
1202  else if (s->chroma_format == 2)
1203  pix_fmts = mpeg12_pixfmt_list_422;
1204  else
1205  pix_fmts = mpeg12_pixfmt_list_444;
1206 
1207  return ff_thread_get_format(avctx, pix_fmts);
1208 }
1209 
1210 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1211 {
1212  // until then pix_fmt may be changed right after codec init
1213  if (avctx->hwaccel
1214 #if FF_API_VDPAU
1215  || uses_vdpau(avctx)
1216 #endif
1217  )
1218  if (avctx->idct_algo == FF_IDCT_AUTO)
1219  avctx->idct_algo = FF_IDCT_SIMPLE;
1220 
1221  if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1222  Mpeg1Context *s1 = avctx->priv_data;
1223  MpegEncContext *s = &s1->mpeg_enc_ctx;
1224 
1225  s->pack_pblocks = 1;
1226 #if FF_API_XVMC
1227 FF_DISABLE_DEPRECATION_WARNINGS
1228  avctx->xvmc_acceleration = 2;
1229 FF_ENABLE_DEPRECATION_WARNINGS
1230 #endif /* FF_API_XVMC */
1231  }
1232 }
1233 
1234 /* Call this function when we know all parameters.
1235  * It may be called in different places for MPEG-1 and MPEG-2. */
1236 static int mpeg_decode_postinit(AVCodecContext *avctx)
1237 {
1238  Mpeg1Context *s1 = avctx->priv_data;
1239  MpegEncContext *s = &s1->mpeg_enc_ctx;
1240  uint8_t old_permutation[64];
1241  int ret;
1242 
1243  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1244  // MPEG-1 aspect
1245  avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1246  } else { // MPEG-2
1247  // MPEG-2 aspect
1248  if (s->aspect_ratio_info > 1) {
1249  AVRational dar =
1250  av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1251  (AVRational) { s1->pan_scan.width,
1252  s1->pan_scan.height }),
1253  (AVRational) { s->width, s->height });
1254 
1255  /* We ignore the spec here and guess a bit as reality does not
1256  * match the spec, see for example res_change_ffmpeg_aspect.ts
1257  * and sequence-display-aspect.mpg.
1258  * issue1613, 621, 562 */
1259  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1260  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1261  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1262  s->avctx->sample_aspect_ratio =
1263  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1264  (AVRational) { s->width, s->height });
1265  } else {
1266  s->avctx->sample_aspect_ratio =
1267  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1268  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1269 // issue1613 4/3 16/9 -> 16/9
1270 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1271 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1272 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1273  ff_dlog(avctx, "aspect A %d/%d\n",
1274  ff_mpeg2_aspect[s->aspect_ratio_info].num,
1275  ff_mpeg2_aspect[s->aspect_ratio_info].den);
1276  ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1277  s->avctx->sample_aspect_ratio.den);
1278  }
1279  } else {
1280  s->avctx->sample_aspect_ratio =
1281  ff_mpeg2_aspect[s->aspect_ratio_info];
1282  }
1283  } // MPEG-2
1284 
1285  if (av_image_check_sar(s->width, s->height,
1286  avctx->sample_aspect_ratio) < 0) {
1287  av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1288  avctx->sample_aspect_ratio.num,
1289  avctx->sample_aspect_ratio.den);
1290  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1291  }
1292 
1293  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1294  avctx->coded_width != s->width ||
1295  avctx->coded_height != s->height ||
1296  s1->save_width != s->width ||
1297  s1->save_height != s->height ||
1298  av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1299  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1300  0) {
1301  if (s1->mpeg_enc_ctx_allocated) {
1302  ParseContext pc = s->parse_context;
1303  s->parse_context.buffer = 0;
1304  ff_mpv_common_end(s);
1305  s->parse_context = pc;
1306  s1->mpeg_enc_ctx_allocated = 0;
1307  }
1308 
1309  ret = ff_set_dimensions(avctx, s->width, s->height);
1310  if (ret < 0)
1311  return ret;
1312 
1313  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1314  avctx->rc_max_rate = s->bit_rate;
1315  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1316  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1317  avctx->bit_rate = s->bit_rate;
1318  }
1319  s1->save_aspect = s->avctx->sample_aspect_ratio;
1320  s1->save_width = s->width;
1321  s1->save_height = s->height;
1322  s1->save_progressive_seq = s->progressive_sequence;
1323 
1324  /* low_delay may be forced, in this case we will have B-frames
1325  * that behave like P-frames. */
1326  avctx->has_b_frames = !s->low_delay;
1327 
1328  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1329  // MPEG-1 fps
1330  avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1331  avctx->ticks_per_frame = 1;
1332 
1333  avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1334  } else { // MPEG-2
1335  // MPEG-2 fps
1336  av_reduce(&s->avctx->framerate.num,
1337  &s->avctx->framerate.den,
1338  ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1339  ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1340  1 << 30);
1341  avctx->ticks_per_frame = 2;
1342 
1343  switch (s->chroma_format) {
1344  case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1345  case 2:
1346  case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1347  default: av_assert0(0);
1348  }
1349  } // MPEG-2
1350 
1351  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1352  setup_hwaccel_for_pixfmt(avctx);
1353 
1354  /* Quantization matrices may need reordering
1355  * if DCT permutation is changed. */
1356  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1357 
1358  ff_mpv_idct_init(s);
1359  if ((ret = ff_mpv_common_init(s)) < 0)
1360  return ret;
1361 
1362  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1363  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1364  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1365  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1366 
1367  s1->mpeg_enc_ctx_allocated = 1;
1368  }
1369  return 0;
1370 }
1371 
1372 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1373  int buf_size)
1374 {
1375  Mpeg1Context *s1 = avctx->priv_data;
1376  MpegEncContext *s = &s1->mpeg_enc_ctx;
1377  int ref, f_code, vbv_delay;
1378 
1379  init_get_bits(&s->gb, buf, buf_size * 8);
1380 
1381  ref = get_bits(&s->gb, 10); /* temporal ref */
1382  s->pict_type = get_bits(&s->gb, 3);
1383  if (s->pict_type == 0 || s->pict_type > 3)
1384  return AVERROR_INVALIDDATA;
1385 
1386  vbv_delay = get_bits(&s->gb, 16);
1387  s->vbv_delay = vbv_delay;
1388  if (s->pict_type == AV_PICTURE_TYPE_P ||
1389  s->pict_type == AV_PICTURE_TYPE_B) {
1390  s->full_pel[0] = get_bits1(&s->gb);
1391  f_code = get_bits(&s->gb, 3);
1392  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1393  return AVERROR_INVALIDDATA;
1394  f_code += !f_code;
1395  s->mpeg_f_code[0][0] = f_code;
1396  s->mpeg_f_code[0][1] = f_code;
1397  }
1398  if (s->pict_type == AV_PICTURE_TYPE_B) {
1399  s->full_pel[1] = get_bits1(&s->gb);
1400  f_code = get_bits(&s->gb, 3);
1401  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1402  return AVERROR_INVALIDDATA;
1403  f_code += !f_code;
1404  s->mpeg_f_code[1][0] = f_code;
1405  s->mpeg_f_code[1][1] = f_code;
1406  }
1407  s->current_picture.f->pict_type = s->pict_type;
1408  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1409 
1410  if (avctx->debug & FF_DEBUG_PICT_INFO)
1411  av_log(avctx, AV_LOG_DEBUG,
1412  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1413 
1414  s->y_dc_scale = 8;
1415  s->c_dc_scale = 8;
1416  return 0;
1417 }
1418 
1419 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1420 {
1421  MpegEncContext *s = &s1->mpeg_enc_ctx;
1422  int horiz_size_ext, vert_size_ext;
1423  int bit_rate_ext;
1424 
1425  skip_bits(&s->gb, 1); /* profile and level esc*/
1426  s->avctx->profile = get_bits(&s->gb, 3);
1427  s->avctx->level = get_bits(&s->gb, 4);
1428  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1429  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1430 
1431  if (!s->chroma_format) {
1432  s->chroma_format = 1;
1433  av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1434  }
1435 
1436  horiz_size_ext = get_bits(&s->gb, 2);
1437  vert_size_ext = get_bits(&s->gb, 2);
1438  s->width |= (horiz_size_ext << 12);
1439  s->height |= (vert_size_ext << 12);
1440  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1441  s->bit_rate += (bit_rate_ext << 18) * 400LL;
1442  check_marker(s->avctx, &s->gb, "after bit rate extension");
1443  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1444 
1445  s->low_delay = get_bits1(&s->gb);
1446  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1447  s->low_delay = 1;
1448 
1449  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1450  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1451 
1452  ff_dlog(s->avctx, "sequence extension\n");
1453  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1454 
1455  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1456  av_log(s->avctx, AV_LOG_DEBUG,
1457  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1458  s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1459  s->avctx->rc_buffer_size, s->bit_rate);
1460 }
1461 
1462 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1463 {
1464  MpegEncContext *s = &s1->mpeg_enc_ctx;
1465  int color_description, w, h;
1466 
1467  skip_bits(&s->gb, 3); /* video format */
1468  color_description = get_bits1(&s->gb);
1469  if (color_description) {
1470  s->avctx->color_primaries = get_bits(&s->gb, 8);
1471  s->avctx->color_trc = get_bits(&s->gb, 8);
1472  s->avctx->colorspace = get_bits(&s->gb, 8);
1473  }
1474  w = get_bits(&s->gb, 14);
1475  skip_bits(&s->gb, 1); // marker
1476  h = get_bits(&s->gb, 14);
1477  // remaining 3 bits are zero padding
1478 
1479  s1->pan_scan.width = 16 * w;
1480  s1->pan_scan.height = 16 * h;
1481 
1482  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1483  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1484 }
1485 
1486 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1487 {
1488  MpegEncContext *s = &s1->mpeg_enc_ctx;
1489  int i, nofco;
1490 
1491  nofco = 1;
1492  if (s->progressive_sequence) {
1493  if (s->repeat_first_field) {
1494  nofco++;
1495  if (s->top_field_first)
1496  nofco++;
1497  }
1498  } else {
1499  if (s->picture_structure == PICT_FRAME) {
1500  nofco++;
1501  if (s->repeat_first_field)
1502  nofco++;
1503  }
1504  }
1505  for (i = 0; i < nofco; i++) {
1506  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1507  skip_bits(&s->gb, 1); // marker
1508  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1509  skip_bits(&s->gb, 1); // marker
1510  }
1511 
1512  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1513  av_log(s->avctx, AV_LOG_DEBUG,
1514  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1515  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1516  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1517  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1518 }
1519 
1520 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1521  uint16_t matrix1[64], int intra)
1522 {
1523  int i;
1524 
1525  for (i = 0; i < 64; i++) {
1526  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1527  int v = get_bits(&s->gb, 8);
1528  if (v == 0) {
1529  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1530  return AVERROR_INVALIDDATA;
1531  }
1532  if (intra && i == 0 && v != 8) {
1533  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1534  v = 8; // needed by pink.mpg / issue1046
1535  }
1536  matrix0[j] = v;
1537  if (matrix1)
1538  matrix1[j] = v;
1539  }
1540  return 0;
1541 }
1542 
1543 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1544 {
1545  ff_dlog(s->avctx, "matrix extension\n");
1546 
1547  if (get_bits1(&s->gb))
1548  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1549  if (get_bits1(&s->gb))
1550  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1551  if (get_bits1(&s->gb))
1552  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1553  if (get_bits1(&s->gb))
1554  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1555 }
1556 
1557 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1558 {
1559  MpegEncContext *s = &s1->mpeg_enc_ctx;
1560 
1561  s->full_pel[0] = s->full_pel[1] = 0;
1562  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1563  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1564  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1565  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1566  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1567  av_log(s->avctx, AV_LOG_ERROR,
1568  "Missing picture start code, guessing missing values\n");
1569  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1570  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1571  s->pict_type = AV_PICTURE_TYPE_I;
1572  else
1573  s->pict_type = AV_PICTURE_TYPE_P;
1574  } else
1575  s->pict_type = AV_PICTURE_TYPE_B;
1576  s->current_picture.f->pict_type = s->pict_type;
1577  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1578  }
1579  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1580  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1581  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1582  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1583 
1584  s->intra_dc_precision = get_bits(&s->gb, 2);
1585  s->picture_structure = get_bits(&s->gb, 2);
1586  s->top_field_first = get_bits1(&s->gb);
1587  s->frame_pred_frame_dct = get_bits1(&s->gb);
1588  s->concealment_motion_vectors = get_bits1(&s->gb);
1589  s->q_scale_type = get_bits1(&s->gb);
1590  s->intra_vlc_format = get_bits1(&s->gb);
1591  s->alternate_scan = get_bits1(&s->gb);
1592  s->repeat_first_field = get_bits1(&s->gb);
1593  s->chroma_420_type = get_bits1(&s->gb);
1594  s->progressive_frame = get_bits1(&s->gb);
1595 
1596  if (s->alternate_scan) {
1597  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1598  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1599  } else {
1600  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1601  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1602  }
1603 
1604  /* composite display not parsed */
1605  ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1606  ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1607  ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1608  ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1609  ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1610  ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1611  ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1612  ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1613  ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1614 }
1615 
1616 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1617 {
1618  AVCodecContext *avctx = s->avctx;
1619  Mpeg1Context *s1 = (Mpeg1Context *) s;
1620  int ret;
1621 
1622  /* start frame decoding */
1623  if (s->first_field || s->picture_structure == PICT_FRAME) {
1624  AVFrameSideData *pan_scan;
1625 
1626  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1627  return ret;
1628 
1629  ff_mpeg_er_frame_start(s);
1630 
1631  /* first check if we must repeat the frame */
1632  s->current_picture_ptr->f->repeat_pict = 0;
1633  if (s->repeat_first_field) {
1634  if (s->progressive_sequence) {
1635  if (s->top_field_first)
1636  s->current_picture_ptr->f->repeat_pict = 4;
1637  else
1638  s->current_picture_ptr->f->repeat_pict = 2;
1639  } else if (s->progressive_frame) {
1640  s->current_picture_ptr->f->repeat_pict = 1;
1641  }
1642  }
1643 
1644  pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1645  AV_FRAME_DATA_PANSCAN,
1646  sizeof(s1->pan_scan));
1647  if (!pan_scan)
1648  return AVERROR(ENOMEM);
1649  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1650 
1651  if (s1->a53_caption) {
1652  AVFrameSideData *sd = av_frame_new_side_data(
1653  s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1654  s1->a53_caption_size);
1655  if (sd)
1656  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1657  av_freep(&s1->a53_caption);
1658  avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
1659  }
1660 
1661  if (s1->has_stereo3d) {
1662  AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1663  if (!stereo)
1664  return AVERROR(ENOMEM);
1665 
1666  *stereo = s1->stereo3d;
1667  s1->has_stereo3d = 0;
1668  }
1669 
1670  if (s1->has_afd) {
1671  AVFrameSideData *sd =
1672  av_frame_new_side_data(s->current_picture_ptr->f,
1673  AV_FRAME_DATA_AFD, 1);
1674  if (!sd)
1675  return AVERROR(ENOMEM);
1676 
1677  *sd->data = s1->afd;
1678  s1->has_afd = 0;
1679  }
1680 
1681  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1682  ff_thread_finish_setup(avctx);
1683  } else { // second field
1684  int i;
1685 
1686  if (!s->current_picture_ptr) {
1687  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1688  return AVERROR_INVALIDDATA;
1689  }
1690 
1691  if (s->avctx->hwaccel &&
1692  (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1693  if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1694  av_log(avctx, AV_LOG_ERROR,
1695  "hardware accelerator failed to decode first field\n");
1696  return ret;
1697  }
1698  }
1699 
1700  for (i = 0; i < 4; i++) {
1701  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1702  if (s->picture_structure == PICT_BOTTOM_FIELD)
1703  s->current_picture.f->data[i] +=
1704  s->current_picture_ptr->f->linesize[i];
1705  }
1706  }
1707 
1708  if (avctx->hwaccel) {
1709  if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1710  return ret;
1711  }
1712 
1713  return 0;
1714 }
1715 
1716 #define DECODE_SLICE_ERROR -1
1717 #define DECODE_SLICE_OK 0
1718 
1719 /**
1720  * Decode a slice.
1721  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1722  * @return DECODE_SLICE_ERROR if the slice is damaged,
1723  * DECODE_SLICE_OK if this slice is OK
1724  */
1725 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1726  const uint8_t **buf, int buf_size)
1727 {
1728  AVCodecContext *avctx = s->avctx;
1729  const int lowres = s->avctx->lowres;
1730  const int field_pic = s->picture_structure != PICT_FRAME;
1731  int ret;
1732 
1733  s->resync_mb_x =
1734  s->resync_mb_y = -1;
1735 
1736  av_assert0(mb_y < s->mb_height);
1737 
1738  init_get_bits(&s->gb, *buf, buf_size * 8);
1739  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1740  skip_bits(&s->gb, 3);
1741 
1742  ff_mpeg1_clean_buffers(s);
1743  s->interlaced_dct = 0;
1744 
1745  s->qscale = get_qscale(s);
1746 
1747  if (s->qscale == 0) {
1748  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1749  return AVERROR_INVALIDDATA;
1750  }
1751 
1752  /* extra slice info */
1753  if (skip_1stop_8data_bits(&s->gb) < 0)
1754  return AVERROR_INVALIDDATA;
1755 
1756  s->mb_x = 0;
1757 
1758  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1759  skip_bits1(&s->gb);
1760  } else {
1761  while (get_bits_left(&s->gb) > 0) {
1762  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1763  MBINCR_VLC_BITS, 2);
1764  if (code < 0) {
1765  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1766  return AVERROR_INVALIDDATA;
1767  }
1768  if (code >= 33) {
1769  if (code == 33)
1770  s->mb_x += 33;
1771  /* otherwise, stuffing, nothing to do */
1772  } else {
1773  s->mb_x += code;
1774  break;
1775  }
1776  }
1777  }
1778 
1779  if (s->mb_x >= (unsigned) s->mb_width) {
1780  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1781  return AVERROR_INVALIDDATA;
1782  }
1783 
1784  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1785  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1786  int start_code = -1;
1787  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1788  if (buf_end < *buf + buf_size)
1789  buf_end -= 4;
1790  s->mb_y = mb_y;
1791  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1792  return DECODE_SLICE_ERROR;
1793  *buf = buf_end;
1794  return DECODE_SLICE_OK;
1795  }
1796 
1797  s->resync_mb_x = s->mb_x;
1798  s->resync_mb_y = s->mb_y = mb_y;
1799  s->mb_skip_run = 0;
1800  ff_init_block_index(s);
1801 
1802  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1803  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1804  av_log(s->avctx, AV_LOG_DEBUG,
1805  "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",
1806  s->qscale,
1807  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1808  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1809  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1810  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1811  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1812  s->progressive_sequence ? "ps" : "",
1813  s->progressive_frame ? "pf" : "",
1814  s->alternate_scan ? "alt" : "",
1815  s->top_field_first ? "top" : "",
1816  s->intra_dc_precision, s->picture_structure,
1817  s->frame_pred_frame_dct, s->concealment_motion_vectors,
1818  s->q_scale_type, s->intra_vlc_format,
1819  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1820  }
1821  }
1822 
1823  for (;;) {
1824  // If 1, we memcpy blocks in xvmcvideo.
1825  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1826  ff_xvmc_init_block(s); // set s->block
1827 
1828  if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1829  return ret;
1830 
1831  // Note motion_val is normally NULL unless we want to extract the MVs.
1832  if (s->current_picture.motion_val[0] && !s->encoding) {
1833  const int wrap = s->b8_stride;
1834  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1835  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1836  int motion_x, motion_y, dir, i;
1837 
1838  for (i = 0; i < 2; i++) {
1839  for (dir = 0; dir < 2; dir++) {
1840  if (s->mb_intra ||
1841  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1842  motion_x = motion_y = 0;
1843  } else if (s->mv_type == MV_TYPE_16X16 ||
1844  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1845  motion_x = s->mv[dir][0][0];
1846  motion_y = s->mv[dir][0][1];
1847  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1848  motion_x = s->mv[dir][i][0];
1849  motion_y = s->mv[dir][i][1];
1850  }
1851 
1852  s->current_picture.motion_val[dir][xy][0] = motion_x;
1853  s->current_picture.motion_val[dir][xy][1] = motion_y;
1854  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1855  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1856  s->current_picture.ref_index [dir][b8_xy] =
1857  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1858  av_assert2(s->field_select[dir][i] == 0 ||
1859  s->field_select[dir][i] == 1);
1860  }
1861  xy += wrap;
1862  b8_xy += 2;
1863  }
1864  }
1865 
1866  s->dest[0] += 16 >> lowres;
1867  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1868  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1869 
1870  ff_mpv_decode_mb(s, s->block);
1871 
1872  if (++s->mb_x >= s->mb_width) {
1873  const int mb_size = 16 >> s->avctx->lowres;
1874  int left;
1875 
1876  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1877  ff_mpv_report_decode_progress(s);
1878 
1879  s->mb_x = 0;
1880  s->mb_y += 1 << field_pic;
1881 
1882  if (s->mb_y >= s->mb_height) {
1883  int left = get_bits_left(&s->gb);
1884  int is_d10 = s->chroma_format == 2 &&
1885  s->pict_type == AV_PICTURE_TYPE_I &&
1886  avctx->profile == 0 && avctx->level == 5 &&
1887  s->intra_dc_precision == 2 &&
1888  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1889  s->progressive_frame == 0
1890  /* vbv_delay == 0xBBB || 0xE10 */;
1891 
1892  if (left >= 32 && !is_d10) {
1893  GetBitContext gb = s->gb;
1894  align_get_bits(&gb);
1895  if (show_bits(&gb, 24) == 0x060E2B) {
1896  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1897  is_d10 = 1;
1898  }
1899  if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1900  av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1901  goto eos;
1902  }
1903  }
1904 
1905  if (left < 0 ||
1906  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1907  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1908  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1909  left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1910  return AVERROR_INVALIDDATA;
1911  } else
1912  goto eos;
1913  }
1914  // There are some files out there which are missing the last slice
1915  // in cases where the slice is completely outside the visible
1916  // area, we detect this here instead of running into the end expecting
1917  // more data
1918  left = get_bits_left(&s->gb);
1919  if (s->mb_y >= ((s->height + 15) >> 4) &&
1920  !s->progressive_sequence &&
1921  left <= 25 &&
1922  left >= 0 &&
1923  s->mb_skip_run == -1 &&
1924  (!left || show_bits(&s->gb, left) == 0))
1925  goto eos;
1926 
1927  ff_init_block_index(s);
1928  }
1929 
1930  /* skip mb handling */
1931  if (s->mb_skip_run == -1) {
1932  /* read increment again */
1933  s->mb_skip_run = 0;
1934  for (;;) {
1935  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1936  MBINCR_VLC_BITS, 2);
1937  if (code < 0) {
1938  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1939  return AVERROR_INVALIDDATA;
1940  }
1941  if (code >= 33) {
1942  if (code == 33) {
1943  s->mb_skip_run += 33;
1944  } else if (code == 35) {
1945  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1946  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1947  return AVERROR_INVALIDDATA;
1948  }
1949  goto eos; /* end of slice */
1950  }
1951  /* otherwise, stuffing, nothing to do */
1952  } else {
1953  s->mb_skip_run += code;
1954  break;
1955  }
1956  }
1957  if (s->mb_skip_run) {
1958  int i;
1959  if (s->pict_type == AV_PICTURE_TYPE_I) {
1960  av_log(s->avctx, AV_LOG_ERROR,
1961  "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1962  return AVERROR_INVALIDDATA;
1963  }
1964 
1965  /* skip mb */
1966  s->mb_intra = 0;
1967  for (i = 0; i < 12; i++)
1968  s->block_last_index[i] = -1;
1969  if (s->picture_structure == PICT_FRAME)
1970  s->mv_type = MV_TYPE_16X16;
1971  else
1972  s->mv_type = MV_TYPE_FIELD;
1973  if (s->pict_type == AV_PICTURE_TYPE_P) {
1974  /* if P type, zero motion vector is implied */
1975  s->mv_dir = MV_DIR_FORWARD;
1976  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1977  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1978  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1979  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1980  } else {
1981  /* if B type, reuse previous vectors and directions */
1982  s->mv[0][0][0] = s->last_mv[0][0][0];
1983  s->mv[0][0][1] = s->last_mv[0][0][1];
1984  s->mv[1][0][0] = s->last_mv[1][0][0];
1985  s->mv[1][0][1] = s->last_mv[1][0][1];
1986  }
1987  }
1988  }
1989  }
1990 eos: // end of slice
1991  if (get_bits_left(&s->gb) < 0) {
1992  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1993  return AVERROR_INVALIDDATA;
1994  }
1995  *buf += (get_bits_count(&s->gb) - 1) / 8;
1996  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);
1997  return 0;
1998 }
1999 
2000 static int slice_decode_thread(AVCodecContext *c, void *arg)
2001 {
2002  MpegEncContext *s = *(void **) arg;
2003  const uint8_t *buf = s->gb.buffer;
2004  int mb_y = s->start_mb_y;
2005  const int field_pic = s->picture_structure != PICT_FRAME;
2006 
2007  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2008 
2009  for (;;) {
2010  uint32_t start_code;
2011  int ret;
2012 
2013  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2014  emms_c();
2015  ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2016  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2017  s->start_mb_y, s->end_mb_y, s->er.error_count);
2018  if (ret < 0) {
2019  if (c->err_recognition & AV_EF_EXPLODE)
2020  return ret;
2021  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2022  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2023  s->mb_x, s->mb_y,
2024  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2025  } else {
2026  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2027  s->mb_x - 1, s->mb_y,
2028  ER_AC_END | ER_DC_END | ER_MV_END);
2029  }
2030 
2031  if (s->mb_y == s->end_mb_y)
2032  return 0;
2033 
2034  start_code = -1;
2035  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2036  mb_y = start_code - SLICE_MIN_START_CODE;
2037  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2038  mb_y += (*buf&0xE0)<<2;
2039  mb_y <<= field_pic;
2040  if (s->picture_structure == PICT_BOTTOM_FIELD)
2041  mb_y++;
2042  if (mb_y < 0 || mb_y >= s->end_mb_y)
2043  return AVERROR_INVALIDDATA;
2044  }
2045 }
2046 
2047 /**
2048  * Handle slice ends.
2049  * @return 1 if it seems to be the last slice
2050  */
2051 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2052 {
2053  Mpeg1Context *s1 = avctx->priv_data;
2054  MpegEncContext *s = &s1->mpeg_enc_ctx;
2055 
2056  if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2057  return 0;
2058 
2059  if (s->avctx->hwaccel) {
2060  int ret = s->avctx->hwaccel->end_frame(s->avctx);
2061  if (ret < 0) {
2062  av_log(avctx, AV_LOG_ERROR,
2063  "hardware accelerator failed to decode picture\n");
2064  return ret;
2065  }
2066  }
2067 
2068  /* end of slice reached */
2069  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2070  /* end of image */
2071 
2072  ff_er_frame_end(&s->er);
2073 
2074  ff_mpv_frame_end(s);
2075 
2076  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2077  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2078  if (ret < 0)
2079  return ret;
2080  ff_print_debug_info(s, s->current_picture_ptr, pict);
2081  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2082  } else {
2083  if (avctx->active_thread_type & FF_THREAD_FRAME)
2084  s->picture_number++;
2085  /* latency of 1 frame for I- and P-frames */
2086  /* XXX: use another variable than picture_number */
2087  if (s->last_picture_ptr) {
2088  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2089  if (ret < 0)
2090  return ret;
2091  ff_print_debug_info(s, s->last_picture_ptr, pict);
2092  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2093  }
2094  }
2095 
2096  return 1;
2097  } else {
2098  return 0;
2099  }
2100 }
2101 
2102 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2103  const uint8_t *buf, int buf_size)
2104 {
2105  Mpeg1Context *s1 = avctx->priv_data;
2106  MpegEncContext *s = &s1->mpeg_enc_ctx;
2107  int width, height;
2108  int i, v, j;
2109 
2110  init_get_bits(&s->gb, buf, buf_size * 8);
2111 
2112  width = get_bits(&s->gb, 12);
2113  height = get_bits(&s->gb, 12);
2114  if (width == 0 || height == 0) {
2115  av_log(avctx, AV_LOG_WARNING,
2116  "Invalid horizontal or vertical size value.\n");
2117  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2118  return AVERROR_INVALIDDATA;
2119  }
2120  s->aspect_ratio_info = get_bits(&s->gb, 4);
2121  if (s->aspect_ratio_info == 0) {
2122  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2123  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2124  return AVERROR_INVALIDDATA;
2125  }
2126  s->frame_rate_index = get_bits(&s->gb, 4);
2127  if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2128  av_log(avctx, AV_LOG_WARNING,
2129  "frame_rate_index %d is invalid\n", s->frame_rate_index);
2130  s->frame_rate_index = 1;
2131  }
2132  s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2133  if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2134  return AVERROR_INVALIDDATA;
2135  }
2136 
2137  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2138  skip_bits(&s->gb, 1);
2139 
2140  /* get matrix */
2141  if (get_bits1(&s->gb)) {
2142  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2143  } else {
2144  for (i = 0; i < 64; i++) {
2145  j = s->idsp.idct_permutation[i];
2146  v = ff_mpeg1_default_intra_matrix[i];
2147  s->intra_matrix[j] = v;
2148  s->chroma_intra_matrix[j] = v;
2149  }
2150  }
2151  if (get_bits1(&s->gb)) {
2152  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2153  } else {
2154  for (i = 0; i < 64; i++) {
2155  int j = s->idsp.idct_permutation[i];
2156  v = ff_mpeg1_default_non_intra_matrix[i];
2157  s->inter_matrix[j] = v;
2158  s->chroma_inter_matrix[j] = v;
2159  }
2160  }
2161 
2162  if (show_bits(&s->gb, 23) != 0) {
2163  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2164  return AVERROR_INVALIDDATA;
2165  }
2166 
2167  s->width = width;
2168  s->height = height;
2169 
2170  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2171  s->progressive_sequence = 1;
2172  s->progressive_frame = 1;
2173  s->picture_structure = PICT_FRAME;
2174  s->first_field = 0;
2175  s->frame_pred_frame_dct = 1;
2176  s->chroma_format = 1;
2177  s->codec_id =
2178  s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2179  s->out_format = FMT_MPEG1;
2180  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2181  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2182  s->low_delay = 1;
2183 
2184  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2185  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2186  s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2187 
2188  return 0;
2189 }
2190 
2191 static int vcr2_init_sequence(AVCodecContext *avctx)
2192 {
2193  Mpeg1Context *s1 = avctx->priv_data;
2194  MpegEncContext *s = &s1->mpeg_enc_ctx;
2195  int i, v, ret;
2196 
2197  /* start new MPEG-1 context decoding */
2198  s->out_format = FMT_MPEG1;
2199  if (s1->mpeg_enc_ctx_allocated) {
2200  ff_mpv_common_end(s);
2201  s1->mpeg_enc_ctx_allocated = 0;
2202  }
2203  s->width = avctx->coded_width;
2204  s->height = avctx->coded_height;
2205  avctx->has_b_frames = 0; // true?
2206  s->low_delay = 1;
2207 
2208  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2209  setup_hwaccel_for_pixfmt(avctx);
2210 
2211  ff_mpv_idct_init(s);
2212  if ((ret = ff_mpv_common_init(s)) < 0)
2213  return ret;
2214  s1->mpeg_enc_ctx_allocated = 1;
2215 
2216  for (i = 0; i < 64; i++) {
2217  int j = s->idsp.idct_permutation[i];
2218  v = ff_mpeg1_default_intra_matrix[i];
2219  s->intra_matrix[j] = v;
2220  s->chroma_intra_matrix[j] = v;
2221 
2222  v = ff_mpeg1_default_non_intra_matrix[i];
2223  s->inter_matrix[j] = v;
2224  s->chroma_inter_matrix[j] = v;
2225  }
2226 
2227  s->progressive_sequence = 1;
2228  s->progressive_frame = 1;
2229  s->picture_structure = PICT_FRAME;
2230  s->first_field = 0;
2231  s->frame_pred_frame_dct = 1;
2232  s->chroma_format = 1;
2233  if (s->codec_tag == AV_RL32("BW10")) {
2234  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2235  } else {
2236  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2237  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2238  }
2239  s1->save_width = s->width;
2240  s1->save_height = s->height;
2241  s1->save_progressive_seq = s->progressive_sequence;
2242  return 0;
2243 }
2244 
2245 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2246  const uint8_t *p, int buf_size)
2247 {
2248  Mpeg1Context *s1 = avctx->priv_data;
2249 
2250  if (buf_size >= 6 &&
2251  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2252  p[4] == 3 && (p[5] & 0x40)) {
2253  /* extract A53 Part 4 CC data */
2254  int cc_count = p[5] & 0x1f;
2255  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2256  av_freep(&s1->a53_caption);
2257  s1->a53_caption_size = cc_count * 3;
2258  s1->a53_caption = av_malloc(s1->a53_caption_size);
2259  if (s1->a53_caption)
2260  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2261  }
2262  return 1;
2263  } else if (buf_size >= 11 &&
2264  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2265  /* extract DVD CC data
2266  *
2267  * uint32_t user_data_start_code 0x000001B2 (big endian)
2268  * uint16_t user_identifier 0x4343 "CC"
2269  * uint8_t user_data_type_code 0x01
2270  * uint8_t caption_block_size 0xF8
2271  * uint8_t
2272  * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2273  * bit 6 caption_filler 0
2274  * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2275  * bit 0 caption_extra_field_added 1=one additional caption word
2276  *
2277  * struct caption_field_block {
2278  * uint8_t
2279  * bit 7:1 caption_filler 0x7F (all 1s)
2280  * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2281  * uint8_t caption_first_byte
2282  * uint8_t caption_second_byte
2283  * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2284  *
2285  * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2286  * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2287  * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2288  * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2289  * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2290  int cc_count = 0;
2291  int i;
2292  // There is a caption count field in the data, but it is often
2293  // incorrect. So count the number of captions present.
2294  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2295  cc_count++;
2296  // Transform the DVD format into A53 Part 4 format
2297  if (cc_count > 0) {
2298  av_freep(&s1->a53_caption);
2299  s1->a53_caption_size = cc_count * 6;
2300  s1->a53_caption = av_malloc(s1->a53_caption_size);
2301  if (s1->a53_caption) {
2302  uint8_t field1 = !!(p[4] & 0x80);
2303  uint8_t *cap = s1->a53_caption;
2304  p += 5;
2305  for (i = 0; i < cc_count; i++) {
2306  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2307  cap[1] = p[1];
2308  cap[2] = p[2];
2309  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2310  cap[4] = p[4];
2311  cap[5] = p[5];
2312  cap += 6;
2313  p += 6;
2314  }
2315  }
2316  }
2317  return 1;
2318  }
2319  return 0;
2320 }
2321 
2322 static void mpeg_decode_user_data(AVCodecContext *avctx,
2323  const uint8_t *p, int buf_size)
2324 {
2325  Mpeg1Context *s = avctx->priv_data;
2326  const uint8_t *buf_end = p + buf_size;
2327  Mpeg1Context *s1 = avctx->priv_data;
2328 
2329 #if 0
2330  int i;
2331  for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2332  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2333  }
2334  av_log(avctx, AV_LOG_ERROR, "\n");
2335 #endif
2336 
2337  if (buf_size > 29){
2338  int i;
2339  for(i=0; i<20; i++)
2340  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2341  s->tmpgexs= 1;
2342  }
2343  }
2344  /* we parse the DTG active format information */
2345  if (buf_end - p >= 5 &&
2346  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2347  int flags = p[4];
2348  p += 5;
2349  if (flags & 0x80) {
2350  /* skip event id */
2351  p += 2;
2352  }
2353  if (flags & 0x40) {
2354  if (buf_end - p < 1)
2355  return;
2356 #if FF_API_AFD
2357 FF_DISABLE_DEPRECATION_WARNINGS
2358  avctx->dtg_active_format = p[0] & 0x0f;
2359 FF_ENABLE_DEPRECATION_WARNINGS
2360 #endif /* FF_API_AFD */
2361  s1->has_afd = 1;
2362  s1->afd = p[0] & 0x0f;
2363  }
2364  } else if (buf_end - p >= 6 &&
2365  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2366  p[4] == 0x03) { // S3D_video_format_length
2367  // the 0x7F mask ignores the reserved_bit value
2368  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2369 
2370  if (S3D_video_format_type == 0x03 ||
2371  S3D_video_format_type == 0x04 ||
2372  S3D_video_format_type == 0x08 ||
2373  S3D_video_format_type == 0x23) {
2374 
2375  s1->has_stereo3d = 1;
2376 
2377  switch (S3D_video_format_type) {
2378  case 0x03:
2379  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2380  break;
2381  case 0x04:
2382  s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2383  break;
2384  case 0x08:
2385  s1->stereo3d.type = AV_STEREO3D_2D;
2386  break;
2387  case 0x23:
2388  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2389  break;
2390  }
2391  }
2392  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2393  return;
2394  }
2395 }
2396 
2397 static void mpeg_decode_gop(AVCodecContext *avctx,
2398  const uint8_t *buf, int buf_size)
2399 {
2400  Mpeg1Context *s1 = avctx->priv_data;
2401  MpegEncContext *s = &s1->mpeg_enc_ctx;
2402  int broken_link;
2403  int64_t tc;
2404 
2405  init_get_bits(&s->gb, buf, buf_size * 8);
2406 
2407  tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2408 
2409 #if FF_API_PRIVATE_OPT
2410 FF_DISABLE_DEPRECATION_WARNINGS
2411  avctx->timecode_frame_start = tc;
2412 FF_ENABLE_DEPRECATION_WARNINGS
2413 #endif
2414 
2415  s->closed_gop = get_bits1(&s->gb);
2416  /* broken_link indicates that after editing the
2417  * reference frames of the first B-Frames after GOP I-Frame
2418  * are missing (open gop) */
2419  broken_link = get_bits1(&s->gb);
2420 
2421  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2422  char tcbuf[AV_TIMECODE_STR_SIZE];
2423  av_timecode_make_mpeg_tc_string(tcbuf, tc);
2424  av_log(s->avctx, AV_LOG_DEBUG,
2425  "GOP (%s) closed_gop=%d broken_link=%d\n",
2426  tcbuf, s->closed_gop, broken_link);
2427  }
2428 }
2429 
2430 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2431  int *got_output, const uint8_t *buf, int buf_size)
2432 {
2433  Mpeg1Context *s = avctx->priv_data;
2434  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2435  const uint8_t *buf_ptr = buf;
2436  const uint8_t *buf_end = buf + buf_size;
2437  int ret, input_size;
2438  int last_code = 0, skip_frame = 0;
2439  int picture_start_code_seen = 0;
2440 
2441  for (;;) {
2442  /* find next start code */
2443  uint32_t start_code = -1;
2444  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2445  if (start_code > 0x1ff) {
2446  if (!skip_frame) {
2447  if (HAVE_THREADS &&
2448  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2449  !avctx->hwaccel) {
2450  int i;
2451  av_assert0(avctx->thread_count > 1);
2452 
2453  avctx->execute(avctx, slice_decode_thread,
2454  &s2->thread_context[0], NULL,
2455  s->slice_count, sizeof(void *));
2456  for (i = 0; i < s->slice_count; i++)
2457  s2->er.error_count += s2->thread_context[i]->er.error_count;
2458  }
2459 
2460 #if FF_API_VDPAU
2461  if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2462  && uses_vdpau(avctx))
2463  ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2464 #endif
2465 
2466  ret = slice_end(avctx, picture);
2467  if (ret < 0)
2468  return ret;
2469  else if (ret) {
2470  // FIXME: merge with the stuff in mpeg_decode_slice
2471  if (s2->last_picture_ptr || s2->low_delay)
2472  *got_output = 1;
2473  }
2474  }
2475  s2->pict_type = 0;
2476 
2477  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2478  return AVERROR_INVALIDDATA;
2479 
2480  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2481  }
2482 
2483  input_size = buf_end - buf_ptr;
2484 
2485  if (avctx->debug & FF_DEBUG_STARTCODE)
2486  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2487  start_code, buf_ptr - buf, input_size);
2488 
2489  /* prepare data for next start code */
2490  switch (start_code) {
2491  case SEQ_START_CODE:
2492  if (last_code == 0) {
2493  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2494  if (buf != avctx->extradata)
2495  s->sync = 1;
2496  } else {
2497  av_log(avctx, AV_LOG_ERROR,
2498  "ignoring SEQ_START_CODE after %X\n", last_code);
2499  if (avctx->err_recognition & AV_EF_EXPLODE)
2500  return AVERROR_INVALIDDATA;
2501  }
2502  break;
2503 
2504  case PICTURE_START_CODE:
2505  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2506  /* If it's a frame picture, there can't be more than one picture header.
2507  Yet, it does happen and we need to handle it. */
2508  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2509  break;
2510  }
2511  picture_start_code_seen = 1;
2512 
2513  if (s2->width <= 0 || s2->height <= 0) {
2514  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2515  s2->width, s2->height);
2516  return AVERROR_INVALIDDATA;
2517  }
2518 
2519  if (s->tmpgexs){
2520  s2->intra_dc_precision= 3;
2521  s2->intra_matrix[0]= 1;
2522  }
2523  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2524  !avctx->hwaccel && s->slice_count) {
2525  int i;
2526 
2527  avctx->execute(avctx, slice_decode_thread,
2528  s2->thread_context, NULL,
2529  s->slice_count, sizeof(void *));
2530  for (i = 0; i < s->slice_count; i++)
2531  s2->er.error_count += s2->thread_context[i]->er.error_count;
2532  s->slice_count = 0;
2533  }
2534  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2535  ret = mpeg_decode_postinit(avctx);
2536  if (ret < 0) {
2537  av_log(avctx, AV_LOG_ERROR,
2538  "mpeg_decode_postinit() failure\n");
2539  return ret;
2540  }
2541 
2542  /* We have a complete image: we try to decompress it. */
2543  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2544  s2->pict_type = 0;
2545  s->first_slice = 1;
2546  last_code = PICTURE_START_CODE;
2547  } else {
2548  av_log(avctx, AV_LOG_ERROR,
2549  "ignoring pic after %X\n", last_code);
2550  if (avctx->err_recognition & AV_EF_EXPLODE)
2551  return AVERROR_INVALIDDATA;
2552  }
2553  break;
2554  case EXT_START_CODE:
2555  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2556 
2557  switch (get_bits(&s2->gb, 4)) {
2558  case 0x1:
2559  if (last_code == 0) {
2560  mpeg_decode_sequence_extension(s);
2561  } else {
2562  av_log(avctx, AV_LOG_ERROR,
2563  "ignoring seq ext after %X\n", last_code);
2564  if (avctx->err_recognition & AV_EF_EXPLODE)
2565  return AVERROR_INVALIDDATA;
2566  }
2567  break;
2568  case 0x2:
2569  mpeg_decode_sequence_display_extension(s);
2570  break;
2571  case 0x3:
2572  mpeg_decode_quant_matrix_extension(s2);
2573  break;
2574  case 0x7:
2575  mpeg_decode_picture_display_extension(s);
2576  break;
2577  case 0x8:
2578  if (last_code == PICTURE_START_CODE) {
2579  mpeg_decode_picture_coding_extension(s);
2580  } else {
2581  av_log(avctx, AV_LOG_ERROR,
2582  "ignoring pic cod ext after %X\n", last_code);
2583  if (avctx->err_recognition & AV_EF_EXPLODE)
2584  return AVERROR_INVALIDDATA;
2585  }
2586  break;
2587  }
2588  break;
2589  case USER_START_CODE:
2590  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2591  break;
2592  case GOP_START_CODE:
2593  if (last_code == 0) {
2594  s2->first_field = 0;
2595  mpeg_decode_gop(avctx, buf_ptr, input_size);
2596  s->sync = 1;
2597  } else {
2598  av_log(avctx, AV_LOG_ERROR,
2599  "ignoring GOP_START_CODE after %X\n", last_code);
2600  if (avctx->err_recognition & AV_EF_EXPLODE)
2601  return AVERROR_INVALIDDATA;
2602  }
2603  break;
2604  default:
2605  if (start_code >= SLICE_MIN_START_CODE &&
2606  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2607  if (s2->progressive_sequence && !s2->progressive_frame) {
2608  s2->progressive_frame = 1;
2609  av_log(s2->avctx, AV_LOG_ERROR,
2610  "interlaced frame in progressive sequence, ignoring\n");
2611  }
2612 
2613  if (s2->picture_structure == 0 ||
2614  (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2615  av_log(s2->avctx, AV_LOG_ERROR,
2616  "picture_structure %d invalid, ignoring\n",
2617  s2->picture_structure);
2618  s2->picture_structure = PICT_FRAME;
2619  }
2620 
2621  if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2622  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2623 
2624  if (s2->picture_structure == PICT_FRAME) {
2625  s2->first_field = 0;
2626  s2->v_edge_pos = 16 * s2->mb_height;
2627  } else {
2628  s2->first_field ^= 1;
2629  s2->v_edge_pos = 8 * s2->mb_height;
2630  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2631  }
2632  }
2633  if (start_code >= SLICE_MIN_START_CODE &&
2634  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2635  const int field_pic = s2->picture_structure != PICT_FRAME;
2636  int mb_y = start_code - SLICE_MIN_START_CODE;
2637  last_code = SLICE_MIN_START_CODE;
2638  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2639  mb_y += (*buf_ptr&0xE0)<<2;
2640 
2641  mb_y <<= field_pic;
2642  if (s2->picture_structure == PICT_BOTTOM_FIELD)
2643  mb_y++;
2644 
2645  if (buf_end - buf_ptr < 2) {
2646  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2647  return AVERROR_INVALIDDATA;
2648  }
2649 
2650  if (mb_y >= s2->mb_height) {
2651  av_log(s2->avctx, AV_LOG_ERROR,
2652  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2653  return AVERROR_INVALIDDATA;
2654  }
2655 
2656  if (!s2->last_picture_ptr) {
2657  /* Skip B-frames if we do not have reference frames and
2658  * GOP is not closed. */
2659  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2660  if (!s2->closed_gop) {
2661  skip_frame = 1;
2662  break;
2663  }
2664  }
2665  }
2666  if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2667  s->sync = 1;
2668  if (!s2->next_picture_ptr) {
2669  /* Skip P-frames if we do not have a reference frame or
2670  * we have an invalid header. */
2671  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2672  skip_frame = 1;
2673  break;
2674  }
2675  }
2676  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2677  s2->pict_type == AV_PICTURE_TYPE_B) ||
2678  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2679  s2->pict_type != AV_PICTURE_TYPE_I) ||
2680  avctx->skip_frame >= AVDISCARD_ALL) {
2681  skip_frame = 1;
2682  break;
2683  }
2684 
2685  if (!s->mpeg_enc_ctx_allocated)
2686  break;
2687 
2688  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2689  if (mb_y < avctx->skip_top ||
2690  mb_y >= s2->mb_height - avctx->skip_bottom)
2691  break;
2692  }
2693 
2694  if (!s2->pict_type) {
2695  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2696  if (avctx->err_recognition & AV_EF_EXPLODE)
2697  return AVERROR_INVALIDDATA;
2698  break;
2699  }
2700 
2701  if (s->first_slice) {
2702  skip_frame = 0;
2703  s->first_slice = 0;
2704  if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2705  return ret;
2706  }
2707  if (!s2->current_picture_ptr) {
2708  av_log(avctx, AV_LOG_ERROR,
2709  "current_picture not initialized\n");
2710  return AVERROR_INVALIDDATA;
2711  }
2712 
2713 #if FF_API_VDPAU
2714  if (uses_vdpau(avctx)) {
2715  s->slice_count++;
2716  break;
2717  }
2718 #endif
2719 
2720  if (HAVE_THREADS &&
2721  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2722  !avctx->hwaccel) {
2723  int threshold = (s2->mb_height * s->slice_count +
2724  s2->slice_context_count / 2) /
2725  s2->slice_context_count;
2726  av_assert0(avctx->thread_count > 1);
2727  if (threshold <= mb_y) {
2728  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2729 
2730  thread_context->start_mb_y = mb_y;
2731  thread_context->end_mb_y = s2->mb_height;
2732  if (s->slice_count) {
2733  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2734  ret = ff_update_duplicate_context(thread_context, s2);
2735  if (ret < 0)
2736  return ret;
2737  }
2738  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2739  s->slice_count++;
2740  }
2741  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2742  } else {
2743  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2744  emms_c();
2745 
2746  if (ret < 0) {
2747  if (avctx->err_recognition & AV_EF_EXPLODE)
2748  return ret;
2749  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2750  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2751  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2752  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2753  } else {
2754  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2755  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2756  ER_AC_END | ER_DC_END | ER_MV_END);
2757  }
2758  }
2759  }
2760  break;
2761  }
2762  }
2763 }
2764 
2765 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2766  int *got_output, AVPacket *avpkt)
2767 {
2768  const uint8_t *buf = avpkt->data;
2769  int ret;
2770  int buf_size = avpkt->size;
2771  Mpeg1Context *s = avctx->priv_data;
2772  AVFrame *picture = data;
2773  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2774 
2775  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2776  /* special case for last picture */
2777  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2778  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2779  if (ret < 0)
2780  return ret;
2781 
2782  s2->next_picture_ptr = NULL;
2783 
2784  *got_output = 1;
2785  }
2786  return buf_size;
2787  }
2788 
2789  if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2790  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2791  buf_size, NULL);
2792 
2793  if (ff_combine_frame(&s2->parse_context, next,
2794  (const uint8_t **) &buf, &buf_size) < 0)
2795  return buf_size;
2796  }
2797 
2798  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2799  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2800  || s2->codec_tag == AV_RL32("BW10")
2801  ))
2802  vcr2_init_sequence(avctx);
2803 
2804  s->slice_count = 0;
2805 
2806  if (avctx->extradata && !s->extradata_decoded) {
2807  ret = decode_chunks(avctx, picture, got_output,
2808  avctx->extradata, avctx->extradata_size);
2809  if (*got_output) {
2810  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2811  av_frame_unref(picture);
2812  *got_output = 0;
2813  }
2814  s->extradata_decoded = 1;
2815  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2816  s2->current_picture_ptr = NULL;
2817  return ret;
2818  }
2819  }
2820 
2821  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2822  if (ret<0 || *got_output) {
2823  s2->current_picture_ptr = NULL;
2824 
2825  if (s2->timecode_frame_start != -1 && *got_output) {
2826  AVFrameSideData *tcside = av_frame_new_side_data(picture,
2827  AV_FRAME_DATA_GOP_TIMECODE,
2828  sizeof(int64_t));
2829  if (!tcside)
2830  return AVERROR(ENOMEM);
2831  memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2832 
2833  s2->timecode_frame_start = -1;
2834  }
2835  }
2836 
2837  return ret;
2838 }
2839 
2840 static void flush(AVCodecContext *avctx)
2841 {
2842  Mpeg1Context *s = avctx->priv_data;
2843 
2844  s->sync = 0;
2845 
2846  ff_mpeg_flush(avctx);
2847 }
2848 
2849 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2850 {
2851  Mpeg1Context *s = avctx->priv_data;
2852 
2853  if (s->mpeg_enc_ctx_allocated)
2854  ff_mpv_common_end(&s->mpeg_enc_ctx);
2855  av_freep(&s->a53_caption);
2856  return 0;
2857 }
2858 
2859 AVCodec ff_mpeg1video_decoder = {
2860  .name = "mpeg1video",
2861  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2862  .type = AVMEDIA_TYPE_VIDEO,
2863  .id = AV_CODEC_ID_MPEG1VIDEO,
2864  .priv_data_size = sizeof(Mpeg1Context),
2865  .init = mpeg_decode_init,
2866  .close = mpeg_decode_end,
2867  .decode = mpeg_decode_frame,
2868  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2869  AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2870  AV_CODEC_CAP_SLICE_THREADS,
2871  .flush = flush,
2872  .max_lowres = 3,
2873  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2874 };
2875 
2876 AVCodec ff_mpeg2video_decoder = {
2877  .name = "mpeg2video",
2878  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2879  .type = AVMEDIA_TYPE_VIDEO,
2880  .id = AV_CODEC_ID_MPEG2VIDEO,
2881  .priv_data_size = sizeof(Mpeg1Context),
2882  .init = mpeg_decode_init,
2883  .close = mpeg_decode_end,
2884  .decode = mpeg_decode_frame,
2885  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2886  AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2887  AV_CODEC_CAP_SLICE_THREADS,
2888  .flush = flush,
2889  .max_lowres = 3,
2890  .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2891 };
2892 
2893 //legacy decoder
2894 AVCodec ff_mpegvideo_decoder = {
2895  .name = "mpegvideo",
2896  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2897  .type = AVMEDIA_TYPE_VIDEO,
2898  .id = AV_CODEC_ID_MPEG2VIDEO,
2899  .priv_data_size = sizeof(Mpeg1Context),
2900  .init = mpeg_decode_init,
2901  .close = mpeg_decode_end,
2902  .decode = mpeg_decode_frame,
2903  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2904  .flush = flush,
2905  .max_lowres = 3,
2906 };
2907 
2908 #if FF_API_XVMC
2909 #if CONFIG_MPEG_XVMC_DECODER
2910 FF_DISABLE_DEPRECATION_WARNINGS
2911 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2912 {
2913  if (avctx->active_thread_type & FF_THREAD_SLICE)
2914  return -1;
2915  if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2916  return -1;
2917  if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2918  ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2919  }
2920  mpeg_decode_init(avctx);
2921 
2922  avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2923  avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2924 
2925  return 0;
2926 }
2927 
2928 AVCodec ff_mpeg_xvmc_decoder = {
2929  .name = "mpegvideo_xvmc",
2930  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2931  .type = AVMEDIA_TYPE_VIDEO,
2932  .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2933  .priv_data_size = sizeof(Mpeg1Context),
2934  .init = mpeg_mc_decode_init,
2935  .close = mpeg_decode_end,
2936  .decode = mpeg_decode_frame,
2937  .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2938  AV_CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL |
2939  AV_CODEC_CAP_DELAY,
2940  .flush = flush,
2941 };
2942 FF_ENABLE_DEPRECATION_WARNINGS
2943 #endif
2944 #endif /* FF_API_XVMC */
2945 
2946 #if CONFIG_MPEG_VDPAU_DECODER && FF_API_VDPAU
2947 AVCodec ff_mpeg_vdpau_decoder = {
2948  .name = "mpegvideo_vdpau",
2949  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2950  .type = AVMEDIA_TYPE_VIDEO,
2951  .id = AV_CODEC_ID_MPEG2VIDEO,
2952  .priv_data_size = sizeof(Mpeg1Context),
2953  .init = mpeg_decode_init,
2954  .close = mpeg_decode_end,
2955  .decode = mpeg_decode_frame,
2956  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED |
2957  AV_CODEC_CAP_HWACCEL_VDPAU | AV_CODEC_CAP_DELAY,
2958  .flush = flush,
2959 };
2960 #endif
2961 
2962 #if CONFIG_MPEG1_VDPAU_DECODER && FF_API_VDPAU
2963 AVCodec ff_mpeg1_vdpau_decoder = {
2964  .name = "mpeg1video_vdpau",
2965  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2966  .type = AVMEDIA_TYPE_VIDEO,
2967  .id = AV_CODEC_ID_MPEG1VIDEO,
2968  .priv_data_size = sizeof(Mpeg1Context),
2969  .init = mpeg_decode_init,
2970  .close = mpeg_decode_end,
2971  .decode = mpeg_decode_frame,
2972  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED |
2973  AV_CODEC_CAP_HWACCEL_VDPAU | AV_CODEC_CAP_DELAY,
2974  .flush = flush,
2975 };
2976 #endif
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:378
AV_EF_AGGRESSIVE
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:2980
ff_tlog
#define ff_tlog(ctx,...)
Definition: internal.h:65
MpegEncContext::idsp
IDCTDSPContext idsp
Definition: mpegvideo.h:227
NULL
#define NULL
Definition: coverity.c:32
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:1685
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:3375
MB_TYPE_SKIP
#define MB_TYPE_SKIP
Definition: avcodec.h:1264
val
const char const char void * val
Definition: avisynth_c.h:771
AVDISCARD_NONKEY
discard all frames except keyframes
Definition: avcodec.h:786
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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:2739
MpegEncContext::timecode_frame_start
int64_t timecode_frame_start
GOP timecode frame start number, in non drop frame format.
Definition: mpegvideo.h:459
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:3783
MpegEncContext::aspect_ratio_info
int aspect_ratio_info
Definition: mpegvideo.h:400
MpegEncContext::picture_number
int picture_number
Definition: mpegvideo.h:124
s
const char * s
Definition: avisynth_c.h:768
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
SLICE_MAX_START_CODE
#define SLICE_MAX_START_CODE
Definition: cavs.h:32
FF_API_VDPAU
#define FF_API_VDPAU
Definition: version.h:109
SLICE_FLAG_ALLOW_FIELD
#define SLICE_FLAG_ALLOW_FIELD
allow draw_horiz_band() with field slices (MPEG-2 field pics)
Definition: avcodec.h:2221
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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:481
MAX_INDEX
#define MAX_INDEX
Definition: mpeg12dec.c:127
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
quant_matrix_rebuild
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, const uint8_t *new_perm)
Definition: mpeg12dec.c:1121
h
h
Definition: vp9dsp_template.c:2093
data
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
MpegEncContext::start_mb_y
int start_mb_y
start mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y) ...
Definition: mpegvideo.h:150
MV_TYPE_FIELD
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:269
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:1878
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float re
Definition: fft.c:82
mpeg_decode_sequence_display_extension
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1462
AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
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:247
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:144
AV_PIX_FMT_VDPAU_MPEG2
MPEG-2 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstr...
Definition: pixfmt.h:106
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1741
FF_IDCT_SIMPLE
#define FF_IDCT_SIMPLE
Definition: avcodec.h:3038
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:210
Mpeg1Context::afd
uint8_t afd
Definition: mpeg12dec.c:62
AV_PIX_FMT_VIDEOTOOLBOX
hardware decoding through Videotoolbox
Definition: pixfmt.h:296
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:151
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
Mpeg1Context::a53_caption
uint8_t * a53_caption
Definition: mpeg12dec.c:60
MpegEncContext::chroma_intra_matrix
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:301
AVPanScan::height
int height
Definition: avcodec.h:1296
MpegEncContext::v_edge_pos
int v_edge_pos
horizontal / vertical position of the right/bottom edge (pixel replication)
Definition: mpegvideo.h:129
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:857
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:2413
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static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:388
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:317
AVPacket::size
int size
Definition: avcodec.h:1602
MpegEncContext::codec_id
enum AVCodecID codec_id
Definition: mpegvideo.h:109
AV_EF_COMPLIANT
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:2979
BlockDSPContext::clear_blocks
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
mpeg_decode_picture_coding_extension
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1557
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const uint8_t * buffer
Definition: get_bits.h:56
ff_mpeg1_clean_buffers
void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:122
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:2087
xvmc_internal.h
MB_TYPE_INTRA
#define MB_TYPE_INTRA
Definition: mpegutils.h:75
ff_mpeg1video_decoder
AVCodec ff_mpeg1video_decoder
Definition: mpeg12dec.c:2859
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:1904
tc
#define tc
Definition: regdef.h:69
mpeg_decode_init
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
Definition: mpeg12dec.c:1065
MB_TYPE_QUANT
#define MB_TYPE_QUANT
Definition: avcodec.h:1272
AV_EF_BITSTREAM
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:2973
mpegvideo.h
mpegvideo header.
HAS_CBP
#define HAS_CBP(a)
Definition: mpegutils.h:103
AVDISCARD_ALL
discard all
Definition: avcodec.h:787
ScanTable::permutated
uint8_t permutated[64]
Definition: idctdsp.h:31
run
uint8_t run
Definition: svq3.c:206
ER_MV_ERROR
#define ER_MV_ERROR
Definition: error_resilience.h:32
mpeg_decode_gop
static void mpeg_decode_gop(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2397
SLICE_MIN_START_CODE
#define SLICE_MIN_START_CODE
Definition: mpegvideo.h:70
AVCodecContext::profile
int profile
profile
Definition: avcodec.h:3181
AV_STEREO3D_SIDEBYSIDE
Views are next to each other.
Definition: stereo3d.h:45
AVCodec
AVCodec.
Definition: avcodec.h:3600
get_dmv
static int get_dmv(MpegEncContext *s)
Definition: mpeg12dec.c:644
MpegEncContext::qscale
int qscale
QP.
Definition: mpegvideo.h:201
RLTable
RLTable.
Definition: rl.h:39
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:232
MpegEncContext::chroma_x_shift
int chroma_x_shift
Definition: mpegvideo.h:475
MpegEncContext::encoding
int encoding
true if we are encoding (vs decoding)
Definition: mpegvideo.h:111
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:3301
ff_mpeg2_non_linear_qscale
const uint8_t ff_mpeg2_non_linear_qscale[32]
Definition: mpegvideodata.c:27
block
static int16_t block[64]
Definition: dct.c:113
AVCodecContext::hwaccel
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2996
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:984
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:101
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:2732
MBINCR_VLC_BITS
#define MBINCR_VLC_BITS
Definition: mpeg12vlc.h:37
ptype2mb_type
static const uint32_t ptype2mb_type[7]
Definition: mpeg12dec.c:76
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:123
MpegEncContext::out_format
enum OutputFormat out_format
output format
Definition: mpegvideo.h:101
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2917
end
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
ff_mpeg1_aspect
const float ff_mpeg1_aspect[16]
Definition: mpeg12data.c:394
thread.h
Multithreading support functions.
AV_CODEC_FLAG_LOW_DELAY
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:878
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:383
load_matrix
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
Definition: mpeg12dec.c:1520
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1791
MpegEncContext::full_pel
int full_pel[2]
Definition: mpegvideo.h:479
MpegEncContext::interlaced_dct
int interlaced_dct
Definition: mpegvideo.h:480
ff_mpv_decode_mb
void ff_mpv_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2720
mpeg_get_pixelformat
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
Definition: mpeg12dec.c:1189
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:177
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:51
MpegEncContext::intra_dc_precision
int intra_dc_precision
Definition: mpegvideo.h:460
MpegEncContext::repeat_first_field
int repeat_first_field
Definition: mpegvideo.h:469
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:143
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:266
PICT_BOTTOM_FIELD
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:38
height
#define height
AVPacket::data
uint8_t * data
Definition: avcodec.h:1601
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
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
AV_CODEC_CAP_HWACCEL_VDPAU
#define AV_CODEC_CAP_HWACCEL_VDPAU
Codec can export data for HW decoding (VDPAU).
Definition: avcodec.h:995
ER_MV_END
#define ER_MV_END
Definition: error_resilience.h:35
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
AV_PIX_FMT_VDPAU_MPEG1
MPEG-1 HW decoding with VDPAU, data[0] contains a vdpau_render_state struct which contains the bitstr...
Definition: pixfmt.h:105
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:126
AVCodecContext::lowres
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:3087
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:117
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:507
AV_CODEC_FLAG_GRAY
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:861
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:88
ff_mv_vlc
VLC ff_mv_vlc
Definition: mpeg12.c:134
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2420
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
ff_vdpau_mpeg_picture_complete
void ff_vdpau_mpeg_picture_complete(MpegEncContext *s, const uint8_t *buf, int buf_size, int slice_count)
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:3036
setup_hwaccel_for_pixfmt
static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
Definition: mpeg12dec.c:1210
version.h
Libavcodec version macros.
AV_CODEC_ID_MPEG1VIDEO
Definition: avcodec.h:195
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:568
AVCodec::id
enum AVCodecID id
Definition: avcodec.h:3614
MpegEncContext::slice_context_count
int slice_context_count
number of used thread_contexts
Definition: mpegvideo.h:153
Mpeg1Context::extradata_decoded
int extradata_decoded
Definition: mpeg12dec.c:71
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:160
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:1998
MpegEncContext::last_dc
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:182
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:787
MT_FIELD
#define MT_FIELD
Definition: mpeg12dec.c:663
PTRDIFF_SPECIFIER
#define PTRDIFF_SPECIFIER
Definition: internal.h:251
MpegEncContext::mb_skipped
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:192
MpegEncContext::chroma_y_shift
int chroma_y_shift
Definition: mpegvideo.h:476
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:250
AVERROR
#define AVERROR(e)
Definition: error.h:43
mpeg_decode_sequence_extension
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1419
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:176
MpegEncContext::er
ERContext er
Definition: mpegvideo.h:550
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:3126
ff_mpegvideo_decoder
AVCodec ff_mpegvideo_decoder
Definition: mpeg12dec.c:2894
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:57
get_qscale
static int get_qscale(MpegEncContext *s)
Definition: mpeg12dec.c:652
arg
const char * arg
Definition: jacosubdec.c:66
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1771
wrap
#define wrap(func)
Definition: neontest.h:65
SEQ_END_CODE
#define SEQ_END_CODE
Definition: mpegvideo.h:66
PICT_TOP_FIELD
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3607
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:1295
MpegEncContext::low_delay
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:404
mpeg_decode_user_data
static void mpeg_decode_user_data(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2322
MpegEncContext::gb
GetBitContext gb
Definition: mpegvideo.h:445
AV_FRAME_DATA_GOP_TIMECODE
The GOP timecode in 25 bit timecode format.
Definition: frame.h:123
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:131
ff_mpv_common_end
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1115
ff_mb_pat_vlc
VLC ff_mb_pat_vlc
Definition: mpeg12.c:142
FFMAX
#define FFMAX(a, b)
Definition: common.h:94
decode_dc
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12.h:32
Mpeg1Context::repeat_field
int repeat_field
Definition: mpeg12dec.c:56
AVCodecContext::timecode_frame_start
attribute_deprecated int64_t timecode_frame_start
Definition: avcodec.h:2788
DECODE_SLICE_ERROR
#define DECODE_SLICE_ERROR
Definition: mpeg12dec.c:1716
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:490
DECODE_SLICE_OK
#define DECODE_SLICE_OK
Definition: mpeg12dec.c:1717
AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2771
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:175
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:215
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:2653
internal.h
common internal API header
ER_AC_ERROR
#define ER_AC_ERROR
Definition: error_resilience.h:30
mpeg_field_start
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:1616
MpegEncContext::intra_vlc_format
int intra_vlc_format
Definition: mpegvideo.h:466
ff_mpeg2_video_profiles
const AVProfile ff_mpeg2_video_profiles[]
Definition: profiles.c:95
AV_CODEC_CAP_DRAW_HORIZ_BAND
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:953
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:1968
MpegEncContext::progressive_frame
int progressive_frame
Definition: mpegvideo.h:478
AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:268
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:258
MB_PAT_VLC_BITS
#define MB_PAT_VLC_BITS
Definition: mpeg12vlc.h:38
MpegEncContext::top_field_first
int top_field_first
Definition: mpegvideo.h:462
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2964
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:3118
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:2191
width
#define width
start_code
static const uint8_t start_code[]
Definition: h264dec.c:657
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:193
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:3035
MB_TYPE_INTERLACED
#define MB_TYPE_INTERLACED
Definition: avcodec.h:1260
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:181
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:34
mpeg_decode_a53_cc
static int mpeg_decode_a53_cc(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2245
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:483
MpegEncContext::alternate_scan
int alternate_scan
Definition: mpegvideo.h:467
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:68
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:2392
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:282
Mpeg1Context::a53_caption_size
int a53_caption_size
Definition: mpeg12dec.c:61
MB_TYPE_L0L1
#define MB_TYPE_L0L1
Definition: avcodec.h:1271
FF_THREAD_SLICE
#define FF_THREAD_SLICE
Decode more than one part of a single frame at once.
Definition: avcodec.h:3119
AVCodecContext::level
int level
level
Definition: avcodec.h:3279
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:181
mpeg_decode_end
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
Definition: mpeg12dec.c:2849
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:535
mpeg_decode_quant_matrix_extension
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
Definition: mpeg12dec.c:1543
MpegEncContext::pblocks
int16_t(*[12] pblocks)[64]
Definition: mpegvideo.h:495
MpegEncContext::block_last_index
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2975
n
int n
Definition: avisynth_c.h:684
IDCTDSPContext::idct_permutation
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
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:1822
MpegEncContext::mpeg_f_code
int mpeg_f_code[2][2]
Definition: mpegvideo.h:454
EXT_START_CODE
#define EXT_START_CODE
Definition: cavs.h:33
MB_TYPE_L1
#define MB_TYPE_L1
Definition: avcodec.h:1270
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
ff_mpeg_update_thread_context
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:483
AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:196
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:193
ff_mpv_decode_defaults
void ff_mpv_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:657
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:3107
mpeg1_decode_sequence
static int mpeg1_decode_sequence(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2102
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:481
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: avcodec.h:1026
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:461
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:127
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:1147
MpegEncContext::concealment_motion_vectors
int concealment_motion_vectors
Definition: mpegvideo.h:463
MpegEncContext::thread_context
struct MpegEncContext * thread_context[MAX_THREADS]
Definition: mpegvideo.h:152
avcodec.h
Libavcodec external API header.
Mpeg1Context::frame_rate_ext
AVRational frame_rate_ext
Definition: mpeg12dec.c:67
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1693
MpegEncContext::bdsp
BlockDSPContext bdsp
Definition: mpegvideo.h:223
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:215
AV_STEREO3D_SIDEBYSIDE_QUINCUNX
Views are next to each other, but when upscaling apply a checkerboard pattern.
Definition: stereo3d.h:87
AV_CODEC_FLAG2_FAST
#define AV_CODEC_FLAG2_FAST
Allow non spec compliant speedup tricks.
Definition: avcodec.h:901
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:2916
error_resilience.h
MB_PTYPE_VLC_BITS
#define MB_PTYPE_VLC_BITS
Definition: mpeg12vlc.h:39
AVCodecContext
main external API structure.
Definition: avcodec.h:1676
mpeg_er.h
MpegEncContext::intra_scantable
ScanTable intra_scantable
Definition: mpegvideo.h:88
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:97
IS_QUANT
#define IS_QUANT(a)
Definition: mpegutils.h:97
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:1708
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:120
AVFrameSideData::data
uint8_t * data
Definition: frame.h:145
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:470
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:1725
ff_print_debug_info
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:1961
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:1792
MpegEncContext::progressive_sequence
int progressive_sequence
Definition: mpegvideo.h:453
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:324
AVCodecContext::slice_flags
int slice_flags
slice flags
Definition: avcodec.h:2219
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:1878
FF_CODEC_PROPERTY_CLOSED_CAPTIONS
#define FF_CODEC_PROPERTY_CLOSED_CAPTIONS
Definition: avcodec.h:3510
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:292
profiles
static const AVProfile profiles[]
Definition: libfdk-aacenc.c:378
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:625
MpegEncContext::closed_gop
int closed_gop
MPEG1/2 GOP is closed.
Definition: mpegvideo.h:208
Mpeg1Context::has_stereo3d
int has_stereo3d
Definition: mpeg12dec.c:59
ff_mb_ptype_vlc
VLC ff_mb_ptype_vlc
Definition: mpeg12.c:140
avpriv_toupper4
unsigned int avpriv_toupper4(unsigned int x)
Definition: utils.c:3922
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:2406
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:2399
Picture::f
struct AVFrame * f
Definition: mpegpicture.h:46
AV_PIX_FMT_VDPAU
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:209
mpeg12_pixfmt_list_422
static enum AVPixelFormat mpeg12_pixfmt_list_422[]
Definition: mpeg12dec.c:1173
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:406
GET_CACHE
#define GET_CACHE(name, gb)
Definition: get_bits.h:197
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:185
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: avcodec.h:1256
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:666
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:815
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:1189
AVCodecContext::dtg_active_format
attribute_deprecated int dtg_active_format
DTG active format information (additional aspect ratio information only used in DVB MPEG-2 transport ...
Definition: avcodec.h:2182
ER_DC_ERROR
#define ER_DC_ERROR
Definition: error_resilience.h:31
AV_PIX_FMT_DXVA2_VLD
HW decoding through DXVA2, Picture.data[3] contains a LPDIRECT3DSURFACE9 pointer. ...
Definition: pixfmt.h:148
mpeg_decode_frame
static int mpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_output, AVPacket *avpkt)
Definition: mpeg12dec.c:2765
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:2430
MpegEncContext::pict_type
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
ff_mpeg12_common_init
av_cold void ff_mpeg12_common_init(MpegEncContext *s)
Definition: mpeg12.c:114
AV_CODEC_CAP_TRUNCATED
#define AV_CODEC_CAP_TRUNCATED
Definition: avcodec.h:960
sign_extend
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:139
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:493
AVCodecContext::skip_bottom
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:2301
flags
static int flags
Definition: cpu.c:47
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
AVPanScan
Pan Scan area.
Definition: avcodec.h:1282
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
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
MpegEncContext::b8_stride
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:128
AVCOL_RANGE_MPEG
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:459
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:78
MpegEncContext::next_picture_ptr
Picture * next_picture_ptr
pointer to the next picture (for bidir pred)
Definition: mpegvideo.h:180
MpegEncContext::avctx
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:194
MB_TYPE_CBP
#define MB_TYPE_CBP
Definition: avcodec.h:1273
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:247
AVDISCARD_NONREF
discard all non reference
Definition: avcodec.h:783
ff_mpeg2_aspect
const AVRational ff_mpeg2_aspect[16]
Definition: mpeg12data.c:415
ERContext::error_count
volatile int error_count
Definition: error_resilience.h:63
mpeg1_hwaccel_pixfmt_list_420
static enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[]
Definition: mpeg12dec.c:1133
AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:70
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:80
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:127
ff_mpv_decode_init
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Definition: mpegvideo.c:662
if
if(ret< 0)
Definition: vf_mcdeint.c:282
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
ff_mpeg2video_decoder
AVCodec ff_mpeg2video_decoder
Definition: mpeg12dec.c:2876
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dv.h:93
mpeg_decode_mb
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpeg12dec.c:668
MpegEncContext::dest
uint8_t * dest[3]
Definition: mpegvideo.h:295
AV_STEREO3D_2D
Video is not stereoscopic (and metadata has to be there).
Definition: stereo3d.h:35
c
static double c[64]
Definition: vsrc_mptestsrc.c:87
GetBitContext::buffer_end
const uint8_t * buffer_end
Definition: get_bits.h:56
flush
static void flush(AVCodecContext *avctx)
Definition: mpeg12dec.c:2840
ff_mbincr_vlc
VLC ff_mbincr_vlc
Definition: mpeg12.c:139
MpegEncContext::last_picture_ptr
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:179
AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:270
mpeg1_decode_picture
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:1372
AVCodecContext::properties
unsigned properties
Definition: avcodec.h:3508
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
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: avcodec.h:1257
ff_update_duplicate_context
int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src)
Definition: mpegvideo.c:455
Mpeg1Context::stereo3d
AVStereo3D stereo3d
Definition: mpeg12dec.c:58
lowres
static int lowres
Definition: ffplay.c:330
IS_INTRA
#define IS_INTRA(x, y)
slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2051
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:1303
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1718
PICT_FRAME
#define PICT_FRAME
Definition: mpegutils.h:39
MpegEncContext::frame_rate_index
int frame_rate_index
Definition: mpegvideo.h:214
ff_mpv_common_init
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:877
mpeg_decode_postinit
static int mpeg_decode_postinit(AVCodecContext *avctx)
Definition: mpeg12dec.c:1236
diff
static av_always_inline int diff(const uint32_t a, const uint32_t b)
Definition: vf_palettegen.c:138
MpegEncContext::picture_structure
int picture_structure
Definition: mpegvideo.h:457
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:2930
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:3147
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
ff_mpv_frame_end
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1421
MT_FRAME
#define MT_FRAME
Definition: mpeg12dec.c:664
MV_TYPE_DMV
#define MV_TYPE_DMV
2 vectors, special mpeg2 Dual Prime Vectors
Definition: mpegvideo.h:270
SEQ_START_CODE
#define SEQ_START_CODE
Definition: mpegvideo.h:67
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:497
MpegEncContext::parse_context
ParseContext parse_context
Definition: mpegvideo.h:362
FF_QSCALE_TYPE_MPEG2
#define FF_QSCALE_TYPE_MPEG2
Definition: avcodec.h:1346
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:100
AV_STEREO3D_TOPBOTTOM
Views are on top of each other.
Definition: stereo3d.h:55
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:253
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:445
AVCodecContext::flags2
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1778
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
SLICE_FLAG_CODED_ORDER
#define SLICE_FLAG_CODED_ORDER
draw_horiz_band() is called in coded order instead of display
Definition: avcodec.h:2220
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:870
AV_CODEC_FLAG2_SHOW_ALL
#define AV_CODEC_FLAG2_SHOW_ALL
Show all frames before the first keyframe.
Definition: avcodec.h:929
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
MpegEncContext::inter_scantable
ScanTable inter_scantable
if inter == intra then intra should be used to reduce the cache usage
Definition: mpegvideo.h:87
decode
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2035
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:195
PICTURE_START_CODE
#define PICTURE_START_CODE
Definition: mpegvideo.h:69
skip_1stop_8data_bits
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:573
AV_PIX_FMT_D3D11VA_VLD
HW decoding through Direct3D11, Picture.data[3] contains a ID3D11VideoDecoderOutputView pointer...
Definition: pixfmt.h:243
AVCHROMA_LOC_CENTER
MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0.
Definition: pixfmt.h:482
ER_AC_END
#define ER_AC_END
Definition: error_resilience.h:33
AVHWAccel::decode_slice
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3797
slice_decode_thread
static int slice_decode_thread(AVCodecContext *c, void *arg)
Definition: mpeg12dec.c:2000
AVHWAccel::end_frame
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3808
mpeg12_pixfmt_list_444
static enum AVPixelFormat mpeg12_pixfmt_list_444[]
Definition: mpeg12dec.c:1178
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1578
ff_mpv_report_decode_progress
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2816
ff_mpeg12_frame_rate_tab
const AVRational ff_mpeg12_frame_rate_tab[16]
Definition: mpeg12data.c:308
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959
MB_TYPE_L0
#define MB_TYPE_L0
Definition: avcodec.h:1269
vdpau_compat.h
mpeg_decode_picture_display_extension
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1486
AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:269
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:2676
Mpeg1Context::pan_scan
AVPanScan pan_scan
Definition: mpeg12dec.c:57
ff_mb_btype_vlc
VLC ff_mb_btype_vlc
Definition: mpeg12.c:141
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