FFmpeg
mpeg12dec.c
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1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27 
28 #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/mem_internal.h"
35 #include "libavutil/stereo3d.h"
37 
38 #include "avcodec.h"
39 #include "bytestream.h"
40 #include "error_resilience.h"
41 #include "hwconfig.h"
42 #include "idctdsp.h"
43 #include "internal.h"
44 #include "mpeg_er.h"
45 #include "mpeg12.h"
46 #include "mpeg12data.h"
47 #include "mpegutils.h"
48 #include "mpegvideo.h"
49 #include "mpegvideodata.h"
50 #include "profiles.h"
51 #include "thread.h"
52 #include "xvmc_internal.h"
53 
54 #define A53_MAX_CC_COUNT 2000
55 
56 typedef struct Mpeg1Context {
58  int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
59  int repeat_field; /* true if we must repeat the field */
60  AVPanScan pan_scan; /* some temporary storage for the panscan */
64  uint8_t afd;
65  int has_afd;
70  AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
71  int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
72  int tmpgexs;
75 } Mpeg1Context;
76 
77 #define MB_TYPE_ZERO_MV 0x20000000
78 
79 static const uint32_t ptype2mb_type[7] = {
82  MB_TYPE_L0,
87 };
88 
89 static const uint32_t btype2mb_type[11] = {
91  MB_TYPE_L1,
93  MB_TYPE_L0,
101 };
102 
103 /* as H.263, but only 17 codes */
104 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
105 {
106  int code, sign, val, shift;
107 
108  code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
109  if (code == 0)
110  return pred;
111  if (code < 0)
112  return 0xffff;
113 
114  sign = get_bits1(&s->gb);
115  shift = fcode - 1;
116  val = code;
117  if (shift) {
118  val = (val - 1) << shift;
119  val |= get_bits(&s->gb, shift);
120  val++;
121  }
122  if (sign)
123  val = -val;
124  val += pred;
125 
126  /* modulo decoding */
127  return sign_extend(val, 5 + shift);
128 }
129 
130 #define MAX_INDEX (64 - 1)
131 #define check_scantable_index(ctx, x) \
132  do { \
133  if ((x) > MAX_INDEX) { \
134  av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
135  ctx->mb_x, ctx->mb_y); \
136  return AVERROR_INVALIDDATA; \
137  } \
138  } while (0)
139 
141  int16_t *block, int n)
142 {
143  int level, i, j, run;
144  RLTable *rl = &ff_rl_mpeg1;
145  uint8_t *const scantable = s->intra_scantable.permutated;
146  const uint16_t *quant_matrix = s->inter_matrix;
147  const int qscale = s->qscale;
148 
149  {
150  OPEN_READER(re, &s->gb);
151  i = -1;
152  // special case for first coefficient, no need to add second VLC table
153  UPDATE_CACHE(re, &s->gb);
154  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
155  level = (3 * qscale * quant_matrix[0]) >> 5;
156  level = (level - 1) | 1;
157  if (GET_CACHE(re, &s->gb) & 0x40000000)
158  level = -level;
159  block[0] = level;
160  i++;
161  SKIP_BITS(re, &s->gb, 2);
162  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
163  goto end;
164  }
165  /* now quantify & encode AC coefficients */
166  for (;;) {
167  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
168  TEX_VLC_BITS, 2, 0);
169 
170  if (level != 0) {
171  i += run;
172  if (i > MAX_INDEX)
173  break;
174  j = scantable[i];
175  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
176  level = (level - 1) | 1;
177  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
178  SHOW_SBITS(re, &s->gb, 1);
179  SKIP_BITS(re, &s->gb, 1);
180  } else {
181  /* escape */
182  run = SHOW_UBITS(re, &s->gb, 6) + 1;
183  LAST_SKIP_BITS(re, &s->gb, 6);
184  UPDATE_CACHE(re, &s->gb);
185  level = SHOW_SBITS(re, &s->gb, 8);
186  SKIP_BITS(re, &s->gb, 8);
187  if (level == -128) {
188  level = SHOW_UBITS(re, &s->gb, 8) - 256;
189  SKIP_BITS(re, &s->gb, 8);
190  } else if (level == 0) {
191  level = SHOW_UBITS(re, &s->gb, 8);
192  SKIP_BITS(re, &s->gb, 8);
193  }
194  i += run;
195  if (i > MAX_INDEX)
196  break;
197  j = scantable[i];
198  if (level < 0) {
199  level = -level;
200  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
201  level = (level - 1) | 1;
202  level = -level;
203  } else {
204  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
205  level = (level - 1) | 1;
206  }
207  }
208 
209  block[j] = level;
210  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
211  break;
212  UPDATE_CACHE(re, &s->gb);
213  }
214 end:
215  LAST_SKIP_BITS(re, &s->gb, 2);
216  CLOSE_READER(re, &s->gb);
217  }
218 
220 
221  s->block_last_index[n] = i;
222  return 0;
223 }
224 
225 /**
226  * Changing this would eat up any speed benefits it has.
227  * Do not use "fast" flag if you need the code to be robust.
228  */
230  int16_t *block, int n)
231 {
232  int level, i, j, run;
233  RLTable *rl = &ff_rl_mpeg1;
234  uint8_t *const scantable = s->intra_scantable.permutated;
235  const int qscale = s->qscale;
236 
237  {
238  OPEN_READER(re, &s->gb);
239  i = -1;
240  // Special case for first coefficient, no need to add second VLC table.
241  UPDATE_CACHE(re, &s->gb);
242  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
243  level = (3 * qscale) >> 1;
244  level = (level - 1) | 1;
245  if (GET_CACHE(re, &s->gb) & 0x40000000)
246  level = -level;
247  block[0] = level;
248  i++;
249  SKIP_BITS(re, &s->gb, 2);
250  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
251  goto end;
252  }
253 
254  /* now quantify & encode AC coefficients */
255  for (;;) {
256  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
257  TEX_VLC_BITS, 2, 0);
258 
259  if (level != 0) {
260  i += run;
261  if (i > MAX_INDEX)
262  break;
263  j = scantable[i];
264  level = ((level * 2 + 1) * qscale) >> 1;
265  level = (level - 1) | 1;
266  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
267  SHOW_SBITS(re, &s->gb, 1);
268  SKIP_BITS(re, &s->gb, 1);
269  } else {
270  /* escape */
271  run = SHOW_UBITS(re, &s->gb, 6) + 1;
272  LAST_SKIP_BITS(re, &s->gb, 6);
273  UPDATE_CACHE(re, &s->gb);
274  level = SHOW_SBITS(re, &s->gb, 8);
275  SKIP_BITS(re, &s->gb, 8);
276  if (level == -128) {
277  level = SHOW_UBITS(re, &s->gb, 8) - 256;
278  SKIP_BITS(re, &s->gb, 8);
279  } else if (level == 0) {
280  level = SHOW_UBITS(re, &s->gb, 8);
281  SKIP_BITS(re, &s->gb, 8);
282  }
283  i += run;
284  if (i > MAX_INDEX)
285  break;
286  j = scantable[i];
287  if (level < 0) {
288  level = -level;
289  level = ((level * 2 + 1) * qscale) >> 1;
290  level = (level - 1) | 1;
291  level = -level;
292  } else {
293  level = ((level * 2 + 1) * qscale) >> 1;
294  level = (level - 1) | 1;
295  }
296  }
297 
298  block[j] = level;
299  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
300  break;
301  UPDATE_CACHE(re, &s->gb);
302  }
303 end:
304  LAST_SKIP_BITS(re, &s->gb, 2);
305  CLOSE_READER(re, &s->gb);
306  }
307 
309 
310  s->block_last_index[n] = i;
311  return 0;
312 }
313 
315  int16_t *block, int n)
316 {
317  int level, i, j, run;
318  RLTable *rl = &ff_rl_mpeg1;
319  uint8_t *const scantable = s->intra_scantable.permutated;
320  const uint16_t *quant_matrix;
321  const int qscale = s->qscale;
322  int mismatch;
323 
324  mismatch = 1;
325 
326  {
327  OPEN_READER(re, &s->gb);
328  i = -1;
329  if (n < 4)
330  quant_matrix = s->inter_matrix;
331  else
332  quant_matrix = s->chroma_inter_matrix;
333 
334  // Special case for first coefficient, no need to add second VLC table.
335  UPDATE_CACHE(re, &s->gb);
336  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
337  level = (3 * qscale * quant_matrix[0]) >> 5;
338  if (GET_CACHE(re, &s->gb) & 0x40000000)
339  level = -level;
340  block[0] = level;
341  mismatch ^= level;
342  i++;
343  SKIP_BITS(re, &s->gb, 2);
344  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
345  goto end;
346  }
347 
348  /* now quantify & encode AC coefficients */
349  for (;;) {
350  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
351  TEX_VLC_BITS, 2, 0);
352 
353  if (level != 0) {
354  i += run;
355  if (i > MAX_INDEX)
356  break;
357  j = scantable[i];
358  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
359  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
360  SHOW_SBITS(re, &s->gb, 1);
361  SKIP_BITS(re, &s->gb, 1);
362  } else {
363  /* escape */
364  run = SHOW_UBITS(re, &s->gb, 6) + 1;
365  LAST_SKIP_BITS(re, &s->gb, 6);
366  UPDATE_CACHE(re, &s->gb);
367  level = SHOW_SBITS(re, &s->gb, 12);
368  SKIP_BITS(re, &s->gb, 12);
369 
370  i += run;
371  if (i > MAX_INDEX)
372  break;
373  j = scantable[i];
374  if (level < 0) {
375  level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
376  level = -level;
377  } else {
378  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
379  }
380  }
381 
382  mismatch ^= level;
383  block[j] = level;
384  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
385  break;
386  UPDATE_CACHE(re, &s->gb);
387  }
388 end:
389  LAST_SKIP_BITS(re, &s->gb, 2);
390  CLOSE_READER(re, &s->gb);
391  }
392  block[63] ^= (mismatch & 1);
393 
395 
396  s->block_last_index[n] = i;
397  return 0;
398 }
399 
400 /**
401  * Changing this would eat up any speed benefits it has.
402  * Do not use "fast" flag if you need the code to be robust.
403  */
405  int16_t *block, int n)
406 {
407  int level, i, j, run;
408  RLTable *rl = &ff_rl_mpeg1;
409  uint8_t *const scantable = s->intra_scantable.permutated;
410  const int qscale = s->qscale;
411  OPEN_READER(re, &s->gb);
412  i = -1;
413 
414  // special case for first coefficient, no need to add second VLC table
415  UPDATE_CACHE(re, &s->gb);
416  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
417  level = (3 * qscale) >> 1;
418  if (GET_CACHE(re, &s->gb) & 0x40000000)
419  level = -level;
420  block[0] = level;
421  i++;
422  SKIP_BITS(re, &s->gb, 2);
423  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
424  goto end;
425  }
426 
427  /* now quantify & encode AC coefficients */
428  for (;;) {
429  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
430 
431  if (level != 0) {
432  i += run;
433  if (i > MAX_INDEX)
434  break;
435  j = scantable[i];
436  level = ((level * 2 + 1) * qscale) >> 1;
437  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
438  SHOW_SBITS(re, &s->gb, 1);
439  SKIP_BITS(re, &s->gb, 1);
440  } else {
441  /* escape */
442  run = SHOW_UBITS(re, &s->gb, 6) + 1;
443  LAST_SKIP_BITS(re, &s->gb, 6);
444  UPDATE_CACHE(re, &s->gb);
445  level = SHOW_SBITS(re, &s->gb, 12);
446  SKIP_BITS(re, &s->gb, 12);
447 
448  i += run;
449  if (i > MAX_INDEX)
450  break;
451  j = scantable[i];
452  if (level < 0) {
453  level = ((-level * 2 + 1) * qscale) >> 1;
454  level = -level;
455  } else {
456  level = ((level * 2 + 1) * qscale) >> 1;
457  }
458  }
459 
460  block[j] = level;
461  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
462  break;
463 
464  UPDATE_CACHE(re, &s->gb);
465  }
466 end:
467  LAST_SKIP_BITS(re, &s->gb, 2);
468  CLOSE_READER(re, &s->gb);
469 
471 
472  s->block_last_index[n] = i;
473  return 0;
474 }
475 
477  int16_t *block, int n)
478 {
479  int level, dc, diff, i, j, run;
480  int component;
481  RLTable *rl;
482  uint8_t *const scantable = s->intra_scantable.permutated;
483  const uint16_t *quant_matrix;
484  const int qscale = s->qscale;
485  int mismatch;
486 
487  /* DC coefficient */
488  if (n < 4) {
489  quant_matrix = s->intra_matrix;
490  component = 0;
491  } else {
492  quant_matrix = s->chroma_intra_matrix;
493  component = (n & 1) + 1;
494  }
495  diff = decode_dc(&s->gb, component);
496  dc = s->last_dc[component];
497  dc += diff;
498  s->last_dc[component] = dc;
499  block[0] = dc * (1 << (3 - s->intra_dc_precision));
500  ff_tlog(s->avctx, "dc=%d\n", block[0]);
501  mismatch = block[0] ^ 1;
502  i = 0;
503  if (s->intra_vlc_format)
504  rl = &ff_rl_mpeg2;
505  else
506  rl = &ff_rl_mpeg1;
507 
508  {
509  OPEN_READER(re, &s->gb);
510  /* now quantify & encode AC coefficients */
511  for (;;) {
512  UPDATE_CACHE(re, &s->gb);
513  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
514  TEX_VLC_BITS, 2, 0);
515 
516  if (level == 127) {
517  break;
518  } else if (level != 0) {
519  i += run;
520  if (i > MAX_INDEX)
521  break;
522  j = scantable[i];
523  level = (level * qscale * quant_matrix[j]) >> 4;
524  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
525  SHOW_SBITS(re, &s->gb, 1);
526  LAST_SKIP_BITS(re, &s->gb, 1);
527  } else {
528  /* escape */
529  run = SHOW_UBITS(re, &s->gb, 6) + 1;
530  SKIP_BITS(re, &s->gb, 6);
531  level = SHOW_SBITS(re, &s->gb, 12);
532  LAST_SKIP_BITS(re, &s->gb, 12);
533  i += run;
534  if (i > MAX_INDEX)
535  break;
536  j = scantable[i];
537  if (level < 0) {
538  level = (-level * qscale * quant_matrix[j]) >> 4;
539  level = -level;
540  } else {
541  level = (level * qscale * quant_matrix[j]) >> 4;
542  }
543  }
544 
545  mismatch ^= level;
546  block[j] = level;
547  }
548  CLOSE_READER(re, &s->gb);
549  }
550  block[63] ^= mismatch & 1;
551 
553 
554  s->block_last_index[n] = i;
555  return 0;
556 }
557 
558 /**
559  * Changing this would eat up any speed benefits it has.
560  * Do not use "fast" flag if you need the code to be robust.
561  */
563  int16_t *block, int n)
564 {
565  int level, dc, diff, i, j, run;
566  int component;
567  RLTable *rl;
568  uint8_t *const scantable = s->intra_scantable.permutated;
569  const uint16_t *quant_matrix;
570  const int qscale = s->qscale;
571 
572  /* DC coefficient */
573  if (n < 4) {
574  quant_matrix = s->intra_matrix;
575  component = 0;
576  } else {
577  quant_matrix = s->chroma_intra_matrix;
578  component = (n & 1) + 1;
579  }
580  diff = decode_dc(&s->gb, component);
581  dc = s->last_dc[component];
582  dc += diff;
583  s->last_dc[component] = dc;
584  block[0] = dc * (1 << (3 - s->intra_dc_precision));
585  i = 0;
586  if (s->intra_vlc_format)
587  rl = &ff_rl_mpeg2;
588  else
589  rl = &ff_rl_mpeg1;
590 
591  {
592  OPEN_READER(re, &s->gb);
593  /* now quantify & encode AC coefficients */
594  for (;;) {
595  UPDATE_CACHE(re, &s->gb);
596  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
597  TEX_VLC_BITS, 2, 0);
598 
599  if (level >= 64 || i > 63) {
600  break;
601  } else if (level != 0) {
602  i += run;
603  j = scantable[i];
604  level = (level * qscale * quant_matrix[j]) >> 4;
605  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
606  SHOW_SBITS(re, &s->gb, 1);
607  LAST_SKIP_BITS(re, &s->gb, 1);
608  } else {
609  /* escape */
610  run = SHOW_UBITS(re, &s->gb, 6) + 1;
611  SKIP_BITS(re, &s->gb, 6);
612  level = SHOW_SBITS(re, &s->gb, 12);
613  LAST_SKIP_BITS(re, &s->gb, 12);
614  i += run;
615  j = scantable[i];
616  if (level < 0) {
617  level = (-level * qscale * quant_matrix[j]) >> 4;
618  level = -level;
619  } else {
620  level = (level * qscale * quant_matrix[j]) >> 4;
621  }
622  }
623 
624  block[j] = level;
625  }
626  CLOSE_READER(re, &s->gb);
627  }
628 
630 
631  s->block_last_index[n] = i;
632  return 0;
633 }
634 
635 /******************************************/
636 /* decoding */
637 
638 static inline int get_dmv(MpegEncContext *s)
639 {
640  if (get_bits1(&s->gb))
641  return 1 - (get_bits1(&s->gb) << 1);
642  else
643  return 0;
644 }
645 
646 /* motion type (for MPEG-2) */
647 #define MT_FIELD 1
648 #define MT_FRAME 2
649 #define MT_16X8 2
650 #define MT_DMV 3
651 
652 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
653 {
654  int i, j, k, cbp, val, mb_type, motion_type;
655  const int mb_block_count = 4 + (1 << s->chroma_format);
656  int ret;
657 
658  ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
659 
660  av_assert2(s->mb_skipped == 0);
661 
662  if (s->mb_skip_run-- != 0) {
663  if (s->pict_type == AV_PICTURE_TYPE_P) {
664  s->mb_skipped = 1;
665  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
667  } else {
668  int mb_type;
669 
670  if (s->mb_x)
671  mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
672  else
673  // FIXME not sure if this is allowed in MPEG at all
674  mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
675  if (IS_INTRA(mb_type)) {
676  av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
677  return AVERROR_INVALIDDATA;
678  }
679  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
680  mb_type | MB_TYPE_SKIP;
681 
682  if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
683  s->mb_skipped = 1;
684  }
685 
686  return 0;
687  }
688 
689  switch (s->pict_type) {
690  default:
691  case AV_PICTURE_TYPE_I:
692  if (get_bits1(&s->gb) == 0) {
693  if (get_bits1(&s->gb) == 0) {
694  av_log(s->avctx, AV_LOG_ERROR,
695  "Invalid mb type in I-frame at %d %d\n",
696  s->mb_x, s->mb_y);
697  return AVERROR_INVALIDDATA;
698  }
699  mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
700  } else {
701  mb_type = MB_TYPE_INTRA;
702  }
703  break;
704  case AV_PICTURE_TYPE_P:
705  mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
706  if (mb_type < 0) {
707  av_log(s->avctx, AV_LOG_ERROR,
708  "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
709  return AVERROR_INVALIDDATA;
710  }
711  mb_type = ptype2mb_type[mb_type];
712  break;
713  case AV_PICTURE_TYPE_B:
714  mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
715  if (mb_type < 0) {
716  av_log(s->avctx, AV_LOG_ERROR,
717  "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
718  return AVERROR_INVALIDDATA;
719  }
720  mb_type = btype2mb_type[mb_type];
721  break;
722  }
723  ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
724 // motion_type = 0; /* avoid warning */
725  if (IS_INTRA(mb_type)) {
726  s->bdsp.clear_blocks(s->block[0]);
727 
728  if (!s->chroma_y_shift)
729  s->bdsp.clear_blocks(s->block[6]);
730 
731  /* compute DCT type */
732  // FIXME: add an interlaced_dct coded var?
733  if (s->picture_structure == PICT_FRAME &&
734  !s->frame_pred_frame_dct)
735  s->interlaced_dct = get_bits1(&s->gb);
736 
737  if (IS_QUANT(mb_type))
738  s->qscale = mpeg_get_qscale(s);
739 
740  if (s->concealment_motion_vectors) {
741  /* just parse them */
742  if (s->picture_structure != PICT_FRAME)
743  skip_bits1(&s->gb); /* field select */
744 
745  s->mv[0][0][0] =
746  s->last_mv[0][0][0] =
747  s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
748  s->last_mv[0][0][0]);
749  s->mv[0][0][1] =
750  s->last_mv[0][0][1] =
751  s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
752  s->last_mv[0][0][1]);
753 
754  check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
755  } else {
756  /* reset mv prediction */
757  memset(s->last_mv, 0, sizeof(s->last_mv));
758  }
759  s->mb_intra = 1;
760  // if 1, we memcpy blocks in xvmcvideo
761  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
762  ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
763 
764  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
765  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
766  for (i = 0; i < 6; i++)
767  mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
768  } else {
769  for (i = 0; i < mb_block_count; i++)
770  if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
771  return ret;
772  }
773  } else {
774  for (i = 0; i < 6; i++) {
776  s->intra_matrix,
777  s->intra_scantable.permutated,
778  s->last_dc, *s->pblocks[i],
779  i, s->qscale);
780  if (ret < 0) {
781  av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
782  s->mb_x, s->mb_y);
783  return ret;
784  }
785 
786  s->block_last_index[i] = ret;
787  }
788  }
789  } else {
790  if (mb_type & MB_TYPE_ZERO_MV) {
791  av_assert2(mb_type & MB_TYPE_CBP);
792 
793  s->mv_dir = MV_DIR_FORWARD;
794  if (s->picture_structure == PICT_FRAME) {
795  if (s->picture_structure == PICT_FRAME
796  && !s->frame_pred_frame_dct)
797  s->interlaced_dct = get_bits1(&s->gb);
798  s->mv_type = MV_TYPE_16X16;
799  } else {
800  s->mv_type = MV_TYPE_FIELD;
801  mb_type |= MB_TYPE_INTERLACED;
802  s->field_select[0][0] = s->picture_structure - 1;
803  }
804 
805  if (IS_QUANT(mb_type))
806  s->qscale = mpeg_get_qscale(s);
807 
808  s->last_mv[0][0][0] = 0;
809  s->last_mv[0][0][1] = 0;
810  s->last_mv[0][1][0] = 0;
811  s->last_mv[0][1][1] = 0;
812  s->mv[0][0][0] = 0;
813  s->mv[0][0][1] = 0;
814  } else {
815  av_assert2(mb_type & MB_TYPE_L0L1);
816  // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
817  /* get additional motion vector type */
818  if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
819  motion_type = MT_FRAME;
820  } else {
821  motion_type = get_bits(&s->gb, 2);
822  if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
823  s->interlaced_dct = get_bits1(&s->gb);
824  }
825 
826  if (IS_QUANT(mb_type))
827  s->qscale = mpeg_get_qscale(s);
828 
829  /* motion vectors */
830  s->mv_dir = (mb_type >> 13) & 3;
831  ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
832  switch (motion_type) {
833  case MT_FRAME: /* or MT_16X8 */
834  if (s->picture_structure == PICT_FRAME) {
835  mb_type |= MB_TYPE_16x16;
836  s->mv_type = MV_TYPE_16X16;
837  for (i = 0; i < 2; i++) {
838  if (USES_LIST(mb_type, i)) {
839  /* MT_FRAME */
840  s->mv[i][0][0] =
841  s->last_mv[i][0][0] =
842  s->last_mv[i][1][0] =
843  mpeg_decode_motion(s, s->mpeg_f_code[i][0],
844  s->last_mv[i][0][0]);
845  s->mv[i][0][1] =
846  s->last_mv[i][0][1] =
847  s->last_mv[i][1][1] =
848  mpeg_decode_motion(s, s->mpeg_f_code[i][1],
849  s->last_mv[i][0][1]);
850  /* full_pel: only for MPEG-1 */
851  if (s->full_pel[i]) {
852  s->mv[i][0][0] *= 2;
853  s->mv[i][0][1] *= 2;
854  }
855  }
856  }
857  } else {
858  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
859  s->mv_type = MV_TYPE_16X8;
860  for (i = 0; i < 2; i++) {
861  if (USES_LIST(mb_type, i)) {
862  /* MT_16X8 */
863  for (j = 0; j < 2; j++) {
864  s->field_select[i][j] = get_bits1(&s->gb);
865  for (k = 0; k < 2; k++) {
866  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
867  s->last_mv[i][j][k]);
868  s->last_mv[i][j][k] = val;
869  s->mv[i][j][k] = val;
870  }
871  }
872  }
873  }
874  }
875  break;
876  case MT_FIELD:
877  s->mv_type = MV_TYPE_FIELD;
878  if (s->picture_structure == PICT_FRAME) {
879  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
880  for (i = 0; i < 2; i++) {
881  if (USES_LIST(mb_type, i)) {
882  for (j = 0; j < 2; j++) {
883  s->field_select[i][j] = get_bits1(&s->gb);
884  val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
885  s->last_mv[i][j][0]);
886  s->last_mv[i][j][0] = val;
887  s->mv[i][j][0] = val;
888  ff_tlog(s->avctx, "fmx=%d\n", val);
889  val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
890  s->last_mv[i][j][1] >> 1);
891  s->last_mv[i][j][1] = 2 * val;
892  s->mv[i][j][1] = val;
893  ff_tlog(s->avctx, "fmy=%d\n", val);
894  }
895  }
896  }
897  } else {
898  av_assert0(!s->progressive_sequence);
899  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
900  for (i = 0; i < 2; i++) {
901  if (USES_LIST(mb_type, i)) {
902  s->field_select[i][0] = get_bits1(&s->gb);
903  for (k = 0; k < 2; k++) {
904  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
905  s->last_mv[i][0][k]);
906  s->last_mv[i][0][k] = val;
907  s->last_mv[i][1][k] = val;
908  s->mv[i][0][k] = val;
909  }
910  }
911  }
912  }
913  break;
914  case MT_DMV:
915  if (s->progressive_sequence){
916  av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
917  return AVERROR_INVALIDDATA;
918  }
919  s->mv_type = MV_TYPE_DMV;
920  for (i = 0; i < 2; i++) {
921  if (USES_LIST(mb_type, i)) {
922  int dmx, dmy, mx, my, m;
923  const int my_shift = s->picture_structure == PICT_FRAME;
924 
925  mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
926  s->last_mv[i][0][0]);
927  s->last_mv[i][0][0] = mx;
928  s->last_mv[i][1][0] = mx;
929  dmx = get_dmv(s);
930  my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
931  s->last_mv[i][0][1] >> my_shift);
932  dmy = get_dmv(s);
933 
934 
935  s->last_mv[i][0][1] = my * (1 << my_shift);
936  s->last_mv[i][1][1] = my * (1 << my_shift);
937 
938  s->mv[i][0][0] = mx;
939  s->mv[i][0][1] = my;
940  s->mv[i][1][0] = mx; // not used
941  s->mv[i][1][1] = my; // not used
942 
943  if (s->picture_structure == PICT_FRAME) {
944  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
945 
946  // m = 1 + 2 * s->top_field_first;
947  m = s->top_field_first ? 1 : 3;
948 
949  /* top -> top pred */
950  s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
951  s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
952  m = 4 - m;
953  s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
954  s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
955  } else {
956  mb_type |= MB_TYPE_16x16;
957 
958  s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
959  s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
960  if (s->picture_structure == PICT_TOP_FIELD)
961  s->mv[i][2][1]--;
962  else
963  s->mv[i][2][1]++;
964  }
965  }
966  }
967  break;
968  default:
969  av_log(s->avctx, AV_LOG_ERROR,
970  "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
971  return AVERROR_INVALIDDATA;
972  }
973  }
974 
975  s->mb_intra = 0;
976  if (HAS_CBP(mb_type)) {
977  s->bdsp.clear_blocks(s->block[0]);
978 
979  cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
980  if (mb_block_count > 6) {
981  cbp *= 1 << mb_block_count - 6;
982  cbp |= get_bits(&s->gb, mb_block_count - 6);
983  s->bdsp.clear_blocks(s->block[6]);
984  }
985  if (cbp <= 0) {
986  av_log(s->avctx, AV_LOG_ERROR,
987  "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
988  return AVERROR_INVALIDDATA;
989  }
990 
991  // if 1, we memcpy blocks in xvmcvideo
992  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
993  ff_xvmc_pack_pblocks(s, cbp);
994 
995  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
996  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
997  for (i = 0; i < 6; i++) {
998  if (cbp & 32)
999  mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1000  else
1001  s->block_last_index[i] = -1;
1002  cbp += cbp;
1003  }
1004  } else {
1005  cbp <<= 12 - mb_block_count;
1006 
1007  for (i = 0; i < mb_block_count; i++) {
1008  if (cbp & (1 << 11)) {
1009  if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1010  return ret;
1011  } else {
1012  s->block_last_index[i] = -1;
1013  }
1014  cbp += cbp;
1015  }
1016  }
1017  } else {
1018  if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1019  for (i = 0; i < 6; i++) {
1020  if (cbp & 32)
1021  mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1022  else
1023  s->block_last_index[i] = -1;
1024  cbp += cbp;
1025  }
1026  } else {
1027  for (i = 0; i < 6; i++) {
1028  if (cbp & 32) {
1029  if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1030  return ret;
1031  } else {
1032  s->block_last_index[i] = -1;
1033  }
1034  cbp += cbp;
1035  }
1036  }
1037  }
1038  } else {
1039  for (i = 0; i < 12; i++)
1040  s->block_last_index[i] = -1;
1041  }
1042  }
1043 
1044  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1045 
1046  return 0;
1047 }
1048 
1050 {
1051  Mpeg1Context *s = avctx->priv_data;
1052  MpegEncContext *s2 = &s->mpeg_enc_ctx;
1053 
1054  if ( avctx->codec_tag != AV_RL32("VCR2")
1055  && avctx->codec_tag != AV_RL32("BW10"))
1056  avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1057  ff_mpv_decode_init(s2, avctx);
1058 
1059  /* we need some permutation to store matrices,
1060  * until the decoder sets the real permutation. */
1062  ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1064 
1065  s2->chroma_format = 1;
1066  s->mpeg_enc_ctx_allocated = 0;
1067  s->mpeg_enc_ctx.picture_number = 0;
1068  s->repeat_field = 0;
1069  avctx->color_range = AVCOL_RANGE_MPEG;
1070  return 0;
1071 }
1072 
1073 #if HAVE_THREADS
1074 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1075  const AVCodecContext *avctx_from)
1076 {
1077  Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1078  MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1079  int err;
1080 
1081  if (avctx == avctx_from ||
1082  !ctx_from->mpeg_enc_ctx_allocated ||
1083  !s1->context_initialized)
1084  return 0;
1085 
1086  err = ff_mpeg_update_thread_context(avctx, avctx_from);
1087  if (err)
1088  return err;
1089 
1090  if (!ctx->mpeg_enc_ctx_allocated)
1091  memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1092 
1093  if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1094  s->picture_number++;
1095 
1096  return 0;
1097 }
1098 #endif
1099 
1100 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1101  const uint8_t *new_perm)
1102 {
1103  uint16_t temp_matrix[64];
1104  int i;
1105 
1106  memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1107 
1108  for (i = 0; i < 64; i++)
1109  matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1110 }
1111 
1113 #if CONFIG_MPEG1_NVDEC_HWACCEL
1115 #endif
1116 #if CONFIG_MPEG1_XVMC_HWACCEL
1118 #endif
1119 #if CONFIG_MPEG1_VDPAU_HWACCEL
1121 #endif
1124 };
1125 
1127 #if CONFIG_MPEG2_NVDEC_HWACCEL
1129 #endif
1130 #if CONFIG_MPEG2_XVMC_HWACCEL
1132 #endif
1133 #if CONFIG_MPEG2_VDPAU_HWACCEL
1135 #endif
1136 #if CONFIG_MPEG2_DXVA2_HWACCEL
1138 #endif
1139 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1142 #endif
1143 #if CONFIG_MPEG2_VAAPI_HWACCEL
1145 #endif
1146 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1148 #endif
1151 };
1152 
1153 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1156 };
1157 
1158 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1161 };
1162 
1164 {
1165  Mpeg1Context *s1 = avctx->priv_data;
1166  MpegEncContext *s = &s1->mpeg_enc_ctx;
1167  const enum AVPixelFormat *pix_fmts;
1168 
1169  if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1170  return AV_PIX_FMT_GRAY8;
1171 
1172  if (s->chroma_format < 2)
1176  else if (s->chroma_format == 2)
1178  else
1180 
1181  return ff_thread_get_format(avctx, pix_fmts);
1182 }
1183 
1185 {
1186  // until then pix_fmt may be changed right after codec init
1187  if (avctx->hwaccel)
1188  if (avctx->idct_algo == FF_IDCT_AUTO)
1189  avctx->idct_algo = FF_IDCT_NONE;
1190 
1191  if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1192  Mpeg1Context *s1 = avctx->priv_data;
1193  MpegEncContext *s = &s1->mpeg_enc_ctx;
1194 
1195  s->pack_pblocks = 1;
1196  }
1197 }
1198 
1199 /* Call this function when we know all parameters.
1200  * It may be called in different places for MPEG-1 and MPEG-2. */
1202 {
1203  Mpeg1Context *s1 = avctx->priv_data;
1204  MpegEncContext *s = &s1->mpeg_enc_ctx;
1205  uint8_t old_permutation[64];
1206  int ret;
1207 
1208  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1209  // MPEG-1 aspect
1210  AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1211  avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1212  } else { // MPEG-2
1213  // MPEG-2 aspect
1214  if (s->aspect_ratio_info > 1) {
1215  AVRational dar =
1216  av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1217  (AVRational) { s1->pan_scan.width,
1218  s1->pan_scan.height }),
1219  (AVRational) { s->width, s->height });
1220 
1221  /* We ignore the spec here and guess a bit as reality does not
1222  * match the spec, see for example res_change_ffmpeg_aspect.ts
1223  * and sequence-display-aspect.mpg.
1224  * issue1613, 621, 562 */
1225  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1226  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1227  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1228  s->avctx->sample_aspect_ratio =
1229  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1230  (AVRational) { s->width, s->height });
1231  } else {
1232  s->avctx->sample_aspect_ratio =
1233  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1234  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1235 // issue1613 4/3 16/9 -> 16/9
1236 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1237 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1238 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1239  ff_dlog(avctx, "aspect A %d/%d\n",
1240  ff_mpeg2_aspect[s->aspect_ratio_info].num,
1241  ff_mpeg2_aspect[s->aspect_ratio_info].den);
1242  ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1243  s->avctx->sample_aspect_ratio.den);
1244  }
1245  } else {
1246  s->avctx->sample_aspect_ratio =
1247  ff_mpeg2_aspect[s->aspect_ratio_info];
1248  }
1249  } // MPEG-2
1250 
1251  if (av_image_check_sar(s->width, s->height,
1252  avctx->sample_aspect_ratio) < 0) {
1253  av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1254  avctx->sample_aspect_ratio.num,
1255  avctx->sample_aspect_ratio.den);
1256  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1257  }
1258 
1259  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1260  avctx->coded_width != s->width ||
1261  avctx->coded_height != s->height ||
1262  s1->save_width != s->width ||
1263  s1->save_height != s->height ||
1264  av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1265  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1266  0) {
1267  if (s1->mpeg_enc_ctx_allocated) {
1268  ParseContext pc = s->parse_context;
1269  s->parse_context.buffer = 0;
1271  s->parse_context = pc;
1272  s1->mpeg_enc_ctx_allocated = 0;
1273  }
1274 
1275  ret = ff_set_dimensions(avctx, s->width, s->height);
1276  if (ret < 0)
1277  return ret;
1278 
1279  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1280  avctx->rc_max_rate = s->bit_rate;
1281  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1282  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1283  avctx->bit_rate = s->bit_rate;
1284  }
1285  s1->save_aspect = s->avctx->sample_aspect_ratio;
1286  s1->save_width = s->width;
1287  s1->save_height = s->height;
1288  s1->save_progressive_seq = s->progressive_sequence;
1289 
1290  /* low_delay may be forced, in this case we will have B-frames
1291  * that behave like P-frames. */
1292  avctx->has_b_frames = !s->low_delay;
1293 
1294  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1295  // MPEG-1 fps
1296  avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1297  avctx->ticks_per_frame = 1;
1298 
1300  } else { // MPEG-2
1301  // MPEG-2 fps
1302  av_reduce(&s->avctx->framerate.num,
1303  &s->avctx->framerate.den,
1304  ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1305  ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1306  1 << 30);
1307  avctx->ticks_per_frame = 2;
1308 
1309  switch (s->chroma_format) {
1310  case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1311  case 2:
1312  case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1313  default: av_assert0(0);
1314  }
1315  } // MPEG-2
1316 
1317  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1318  setup_hwaccel_for_pixfmt(avctx);
1319 
1320  /* Quantization matrices may need reordering
1321  * if DCT permutation is changed. */
1322  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1323 
1325  if ((ret = ff_mpv_common_init(s)) < 0)
1326  return ret;
1327 
1328  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1329  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1330  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1331  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1332 
1333  s1->mpeg_enc_ctx_allocated = 1;
1334  }
1335  return 0;
1336 }
1337 
1338 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1339  int buf_size)
1340 {
1341  Mpeg1Context *s1 = avctx->priv_data;
1342  MpegEncContext *s = &s1->mpeg_enc_ctx;
1343  int ref, f_code, vbv_delay, ret;
1344 
1345  ret = init_get_bits8(&s->gb, buf, buf_size);
1346  if (ret < 0)
1347  return ret;
1348 
1349  ref = get_bits(&s->gb, 10); /* temporal ref */
1350  s->pict_type = get_bits(&s->gb, 3);
1351  if (s->pict_type == 0 || s->pict_type > 3)
1352  return AVERROR_INVALIDDATA;
1353 
1354  vbv_delay = get_bits(&s->gb, 16);
1355  s->vbv_delay = vbv_delay;
1356  if (s->pict_type == AV_PICTURE_TYPE_P ||
1357  s->pict_type == AV_PICTURE_TYPE_B) {
1358  s->full_pel[0] = get_bits1(&s->gb);
1359  f_code = get_bits(&s->gb, 3);
1360  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1361  return AVERROR_INVALIDDATA;
1362  f_code += !f_code;
1363  s->mpeg_f_code[0][0] = f_code;
1364  s->mpeg_f_code[0][1] = f_code;
1365  }
1366  if (s->pict_type == AV_PICTURE_TYPE_B) {
1367  s->full_pel[1] = get_bits1(&s->gb);
1368  f_code = get_bits(&s->gb, 3);
1369  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1370  return AVERROR_INVALIDDATA;
1371  f_code += !f_code;
1372  s->mpeg_f_code[1][0] = f_code;
1373  s->mpeg_f_code[1][1] = f_code;
1374  }
1375  s->current_picture.f->pict_type = s->pict_type;
1376  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1377 
1378  if (avctx->debug & FF_DEBUG_PICT_INFO)
1379  av_log(avctx, AV_LOG_DEBUG,
1380  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1381 
1382  s->y_dc_scale = 8;
1383  s->c_dc_scale = 8;
1384  return 0;
1385 }
1386 
1388 {
1389  MpegEncContext *s = &s1->mpeg_enc_ctx;
1390  int horiz_size_ext, vert_size_ext;
1391  int bit_rate_ext;
1392  AVCPBProperties *cpb_props;
1393 
1394  skip_bits(&s->gb, 1); /* profile and level esc*/
1395  s->avctx->profile = get_bits(&s->gb, 3);
1396  s->avctx->level = get_bits(&s->gb, 4);
1397  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1398  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1399 
1400  if (!s->chroma_format) {
1401  s->chroma_format = 1;
1402  av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1403  }
1404 
1405  horiz_size_ext = get_bits(&s->gb, 2);
1406  vert_size_ext = get_bits(&s->gb, 2);
1407  s->width |= (horiz_size_ext << 12);
1408  s->height |= (vert_size_ext << 12);
1409  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1410  s->bit_rate += (bit_rate_ext << 18) * 400LL;
1411  check_marker(s->avctx, &s->gb, "after bit rate extension");
1412  s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1413 
1414  s->low_delay = get_bits1(&s->gb);
1415  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1416  s->low_delay = 1;
1417 
1418  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1419  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1420 
1421  ff_dlog(s->avctx, "sequence extension\n");
1422  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1423 
1424  if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1425  cpb_props->buffer_size = s1->rc_buffer_size;
1426  if (s->bit_rate != 0x3FFFF*400)
1427  cpb_props->max_bitrate = s->bit_rate;
1428  }
1429 
1430  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1431  av_log(s->avctx, AV_LOG_DEBUG,
1432  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1433  s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1434  s1->rc_buffer_size, s->bit_rate);
1435 }
1436 
1438 {
1439  MpegEncContext *s = &s1->mpeg_enc_ctx;
1440  int color_description, w, h;
1441 
1442  skip_bits(&s->gb, 3); /* video format */
1443  color_description = get_bits1(&s->gb);
1444  if (color_description) {
1445  s->avctx->color_primaries = get_bits(&s->gb, 8);
1446  s->avctx->color_trc = get_bits(&s->gb, 8);
1447  s->avctx->colorspace = get_bits(&s->gb, 8);
1448  }
1449  w = get_bits(&s->gb, 14);
1450  skip_bits(&s->gb, 1); // marker
1451  h = get_bits(&s->gb, 14);
1452  // remaining 3 bits are zero padding
1453 
1454  s1->pan_scan.width = 16 * w;
1455  s1->pan_scan.height = 16 * h;
1456 
1457  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1458  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1459 }
1460 
1462 {
1463  MpegEncContext *s = &s1->mpeg_enc_ctx;
1464  int i, nofco;
1465 
1466  nofco = 1;
1467  if (s->progressive_sequence) {
1468  if (s->repeat_first_field) {
1469  nofco++;
1470  if (s->top_field_first)
1471  nofco++;
1472  }
1473  } else {
1474  if (s->picture_structure == PICT_FRAME) {
1475  nofco++;
1476  if (s->repeat_first_field)
1477  nofco++;
1478  }
1479  }
1480  for (i = 0; i < nofco; i++) {
1481  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1482  skip_bits(&s->gb, 1); // marker
1483  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1484  skip_bits(&s->gb, 1); // marker
1485  }
1486 
1487  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1488  av_log(s->avctx, AV_LOG_DEBUG,
1489  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1490  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1491  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1492  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1493 }
1494 
1495 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1496  uint16_t matrix1[64], int intra)
1497 {
1498  int i;
1499 
1500  for (i = 0; i < 64; i++) {
1501  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1502  int v = get_bits(&s->gb, 8);
1503  if (v == 0) {
1504  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1505  return AVERROR_INVALIDDATA;
1506  }
1507  if (intra && i == 0 && v != 8) {
1508  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1509  v = 8; // needed by pink.mpg / issue1046
1510  }
1511  matrix0[j] = v;
1512  if (matrix1)
1513  matrix1[j] = v;
1514  }
1515  return 0;
1516 }
1517 
1519 {
1520  ff_dlog(s->avctx, "matrix extension\n");
1521 
1522  if (get_bits1(&s->gb))
1523  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1524  if (get_bits1(&s->gb))
1525  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1526  if (get_bits1(&s->gb))
1527  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1528  if (get_bits1(&s->gb))
1529  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1530 }
1531 
1533 {
1534  MpegEncContext *s = &s1->mpeg_enc_ctx;
1535 
1536  s->full_pel[0] = s->full_pel[1] = 0;
1537  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1538  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1539  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1540  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1541  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1542  av_log(s->avctx, AV_LOG_ERROR,
1543  "Missing picture start code, guessing missing values\n");
1544  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1545  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1546  s->pict_type = AV_PICTURE_TYPE_I;
1547  else
1548  s->pict_type = AV_PICTURE_TYPE_P;
1549  } else
1550  s->pict_type = AV_PICTURE_TYPE_B;
1551  s->current_picture.f->pict_type = s->pict_type;
1552  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1553  }
1554  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1555  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1556  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1557  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1558 
1559  s->intra_dc_precision = get_bits(&s->gb, 2);
1560  s->picture_structure = get_bits(&s->gb, 2);
1561  s->top_field_first = get_bits1(&s->gb);
1562  s->frame_pred_frame_dct = get_bits1(&s->gb);
1563  s->concealment_motion_vectors = get_bits1(&s->gb);
1564  s->q_scale_type = get_bits1(&s->gb);
1565  s->intra_vlc_format = get_bits1(&s->gb);
1566  s->alternate_scan = get_bits1(&s->gb);
1567  s->repeat_first_field = get_bits1(&s->gb);
1568  s->chroma_420_type = get_bits1(&s->gb);
1569  s->progressive_frame = get_bits1(&s->gb);
1570 
1571  if (s->alternate_scan) {
1572  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1573  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1574  } else {
1575  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1576  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1577  }
1578 
1579  /* composite display not parsed */
1580  ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1581  ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1582  ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1583  ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1584  ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1585  ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1586  ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1587  ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1588  ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1589 }
1590 
1591 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1592 {
1593  AVCodecContext *avctx = s->avctx;
1594  Mpeg1Context *s1 = (Mpeg1Context *) s;
1595  int ret;
1596 
1597  if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1598  if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1599  return AVERROR_INVALIDDATA;
1600  }
1601 
1602  /* start frame decoding */
1603  if (s->first_field || s->picture_structure == PICT_FRAME) {
1604  AVFrameSideData *pan_scan;
1605 
1606  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1607  return ret;
1608 
1610 
1611  /* first check if we must repeat the frame */
1612  s->current_picture_ptr->f->repeat_pict = 0;
1613  if (s->repeat_first_field) {
1614  if (s->progressive_sequence) {
1615  if (s->top_field_first)
1616  s->current_picture_ptr->f->repeat_pict = 4;
1617  else
1618  s->current_picture_ptr->f->repeat_pict = 2;
1619  } else if (s->progressive_frame) {
1620  s->current_picture_ptr->f->repeat_pict = 1;
1621  }
1622  }
1623 
1624  pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1626  sizeof(s1->pan_scan));
1627  if (!pan_scan)
1628  return AVERROR(ENOMEM);
1629  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1630 
1631  if (s1->a53_buf_ref) {
1633  s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1634  s1->a53_buf_ref);
1635  if (!sd)
1636  av_buffer_unref(&s1->a53_buf_ref);
1637  s1->a53_buf_ref = NULL;
1638  }
1639 
1640  if (s1->has_stereo3d) {
1641  AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1642  if (!stereo)
1643  return AVERROR(ENOMEM);
1644 
1645  *stereo = s1->stereo3d;
1646  s1->has_stereo3d = 0;
1647  }
1648 
1649  if (s1->has_afd) {
1650  AVFrameSideData *sd =
1651  av_frame_new_side_data(s->current_picture_ptr->f,
1652  AV_FRAME_DATA_AFD, 1);
1653  if (!sd)
1654  return AVERROR(ENOMEM);
1655 
1656  *sd->data = s1->afd;
1657  s1->has_afd = 0;
1658  }
1659 
1660  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1661  ff_thread_finish_setup(avctx);
1662  } else { // second field
1663  int i;
1664 
1665  if (!s->current_picture_ptr) {
1666  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1667  return AVERROR_INVALIDDATA;
1668  }
1669 
1670  if (s->avctx->hwaccel) {
1671  if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1672  av_log(avctx, AV_LOG_ERROR,
1673  "hardware accelerator failed to decode first field\n");
1674  return ret;
1675  }
1676  }
1677 
1678  for (i = 0; i < 4; i++) {
1679  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1680  if (s->picture_structure == PICT_BOTTOM_FIELD)
1681  s->current_picture.f->data[i] +=
1682  s->current_picture_ptr->f->linesize[i];
1683  }
1684  }
1685 
1686  if (avctx->hwaccel) {
1687  if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1688  return ret;
1689  }
1690 
1691  return 0;
1692 }
1693 
1694 #define DECODE_SLICE_ERROR -1
1695 #define DECODE_SLICE_OK 0
1696 
1697 /**
1698  * Decode a slice.
1699  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1700  * @return DECODE_SLICE_ERROR if the slice is damaged,
1701  * DECODE_SLICE_OK if this slice is OK
1702  */
1703 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1704  const uint8_t **buf, int buf_size)
1705 {
1706  AVCodecContext *avctx = s->avctx;
1707  const int lowres = s->avctx->lowres;
1708  const int field_pic = s->picture_structure != PICT_FRAME;
1709  int ret;
1710 
1711  s->resync_mb_x =
1712  s->resync_mb_y = -1;
1713 
1714  av_assert0(mb_y < s->mb_height);
1715 
1716  init_get_bits(&s->gb, *buf, buf_size * 8);
1717  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1718  skip_bits(&s->gb, 3);
1719 
1721  s->interlaced_dct = 0;
1722 
1723  s->qscale = mpeg_get_qscale(s);
1724 
1725  if (s->qscale == 0) {
1726  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1727  return AVERROR_INVALIDDATA;
1728  }
1729 
1730  /* extra slice info */
1731  if (skip_1stop_8data_bits(&s->gb) < 0)
1732  return AVERROR_INVALIDDATA;
1733 
1734  s->mb_x = 0;
1735 
1736  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1737  skip_bits1(&s->gb);
1738  } else {
1739  while (get_bits_left(&s->gb) > 0) {
1740  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1741  MBINCR_VLC_BITS, 2);
1742  if (code < 0) {
1743  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1744  return AVERROR_INVALIDDATA;
1745  }
1746  if (code >= 33) {
1747  if (code == 33)
1748  s->mb_x += 33;
1749  /* otherwise, stuffing, nothing to do */
1750  } else {
1751  s->mb_x += code;
1752  break;
1753  }
1754  }
1755  }
1756 
1757  if (s->mb_x >= (unsigned) s->mb_width) {
1758  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1759  return AVERROR_INVALIDDATA;
1760  }
1761 
1762  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1763  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1764  int start_code = -1;
1765  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1766  if (buf_end < *buf + buf_size)
1767  buf_end -= 4;
1768  s->mb_y = mb_y;
1769  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1770  return DECODE_SLICE_ERROR;
1771  *buf = buf_end;
1772  return DECODE_SLICE_OK;
1773  }
1774 
1775  s->resync_mb_x = s->mb_x;
1776  s->resync_mb_y = s->mb_y = mb_y;
1777  s->mb_skip_run = 0;
1779 
1780  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1781  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1782  av_log(s->avctx, AV_LOG_DEBUG,
1783  "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",
1784  s->qscale,
1785  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1786  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1787  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1788  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1789  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1790  s->progressive_sequence ? "ps" : "",
1791  s->progressive_frame ? "pf" : "",
1792  s->alternate_scan ? "alt" : "",
1793  s->top_field_first ? "top" : "",
1794  s->intra_dc_precision, s->picture_structure,
1795  s->frame_pred_frame_dct, s->concealment_motion_vectors,
1796  s->q_scale_type, s->intra_vlc_format,
1797  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1798  }
1799  }
1800 
1801  for (;;) {
1802  // If 1, we memcpy blocks in xvmcvideo.
1803  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1804  ff_xvmc_init_block(s); // set s->block
1805 
1806  if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1807  return ret;
1808 
1809  // Note motion_val is normally NULL unless we want to extract the MVs.
1810  if (s->current_picture.motion_val[0] && !s->encoding) {
1811  const int wrap = s->b8_stride;
1812  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1813  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1814  int motion_x, motion_y, dir, i;
1815 
1816  for (i = 0; i < 2; i++) {
1817  for (dir = 0; dir < 2; dir++) {
1818  if (s->mb_intra ||
1819  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1820  motion_x = motion_y = 0;
1821  } else if (s->mv_type == MV_TYPE_16X16 ||
1822  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1823  motion_x = s->mv[dir][0][0];
1824  motion_y = s->mv[dir][0][1];
1825  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1826  motion_x = s->mv[dir][i][0];
1827  motion_y = s->mv[dir][i][1];
1828  }
1829 
1830  s->current_picture.motion_val[dir][xy][0] = motion_x;
1831  s->current_picture.motion_val[dir][xy][1] = motion_y;
1832  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1833  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1834  s->current_picture.ref_index [dir][b8_xy] =
1835  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1836  av_assert2(s->field_select[dir][i] == 0 ||
1837  s->field_select[dir][i] == 1);
1838  }
1839  xy += wrap;
1840  b8_xy += 2;
1841  }
1842  }
1843 
1844  s->dest[0] += 16 >> lowres;
1845  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1846  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1847 
1848  ff_mpv_reconstruct_mb(s, s->block);
1849 
1850  if (++s->mb_x >= s->mb_width) {
1851  const int mb_size = 16 >> s->avctx->lowres;
1852  int left;
1853 
1854  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1856 
1857  s->mb_x = 0;
1858  s->mb_y += 1 << field_pic;
1859 
1860  if (s->mb_y >= s->mb_height) {
1861  int left = get_bits_left(&s->gb);
1862  int is_d10 = s->chroma_format == 2 &&
1863  s->pict_type == AV_PICTURE_TYPE_I &&
1864  avctx->profile == 0 && avctx->level == 5 &&
1865  s->intra_dc_precision == 2 &&
1866  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1867  s->progressive_frame == 0
1868  /* vbv_delay == 0xBBB || 0xE10 */;
1869 
1870  if (left >= 32 && !is_d10) {
1871  GetBitContext gb = s->gb;
1872  align_get_bits(&gb);
1873  if (show_bits(&gb, 24) == 0x060E2B) {
1874  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1875  is_d10 = 1;
1876  }
1877  if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1878  av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1879  goto eos;
1880  }
1881  }
1882 
1883  if (left < 0 ||
1884  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1885  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1886  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1887  left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1888  return AVERROR_INVALIDDATA;
1889  } else
1890  goto eos;
1891  }
1892  // There are some files out there which are missing the last slice
1893  // in cases where the slice is completely outside the visible
1894  // area, we detect this here instead of running into the end expecting
1895  // more data
1896  left = get_bits_left(&s->gb);
1897  if (s->mb_y >= ((s->height + 15) >> 4) &&
1898  !s->progressive_sequence &&
1899  left <= 25 &&
1900  left >= 0 &&
1901  s->mb_skip_run == -1 &&
1902  (!left || show_bits(&s->gb, left) == 0))
1903  goto eos;
1904 
1906  }
1907 
1908  /* skip mb handling */
1909  if (s->mb_skip_run == -1) {
1910  /* read increment again */
1911  s->mb_skip_run = 0;
1912  for (;;) {
1913  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1914  MBINCR_VLC_BITS, 2);
1915  if (code < 0) {
1916  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1917  return AVERROR_INVALIDDATA;
1918  }
1919  if (code >= 33) {
1920  if (code == 33) {
1921  s->mb_skip_run += 33;
1922  } else if (code == 35) {
1923  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1924  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1925  return AVERROR_INVALIDDATA;
1926  }
1927  goto eos; /* end of slice */
1928  }
1929  /* otherwise, stuffing, nothing to do */
1930  } else {
1931  s->mb_skip_run += code;
1932  break;
1933  }
1934  }
1935  if (s->mb_skip_run) {
1936  int i;
1937  if (s->pict_type == AV_PICTURE_TYPE_I) {
1938  av_log(s->avctx, AV_LOG_ERROR,
1939  "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1940  return AVERROR_INVALIDDATA;
1941  }
1942 
1943  /* skip mb */
1944  s->mb_intra = 0;
1945  for (i = 0; i < 12; i++)
1946  s->block_last_index[i] = -1;
1947  if (s->picture_structure == PICT_FRAME)
1948  s->mv_type = MV_TYPE_16X16;
1949  else
1950  s->mv_type = MV_TYPE_FIELD;
1951  if (s->pict_type == AV_PICTURE_TYPE_P) {
1952  /* if P type, zero motion vector is implied */
1953  s->mv_dir = MV_DIR_FORWARD;
1954  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1955  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1956  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1957  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1958  } else {
1959  /* if B type, reuse previous vectors and directions */
1960  s->mv[0][0][0] = s->last_mv[0][0][0];
1961  s->mv[0][0][1] = s->last_mv[0][0][1];
1962  s->mv[1][0][0] = s->last_mv[1][0][0];
1963  s->mv[1][0][1] = s->last_mv[1][0][1];
1964  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1965  s->field_select[1][0] = (s->picture_structure - 1) & 1;
1966  }
1967  }
1968  }
1969  }
1970 eos: // end of slice
1971  if (get_bits_left(&s->gb) < 0) {
1972  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1973  return AVERROR_INVALIDDATA;
1974  }
1975  *buf += (get_bits_count(&s->gb) - 1) / 8;
1976  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);
1977  return 0;
1978 }
1979 
1981 {
1982  MpegEncContext *s = *(void **) arg;
1983  const uint8_t *buf = s->gb.buffer;
1984  int mb_y = s->start_mb_y;
1985  const int field_pic = s->picture_structure != PICT_FRAME;
1986 
1987  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1988 
1989  for (;;) {
1990  uint32_t start_code;
1991  int ret;
1992 
1993  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1994  emms_c();
1995  ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1996  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1997  s->start_mb_y, s->end_mb_y, s->er.error_count);
1998  if (ret < 0) {
1999  if (c->err_recognition & AV_EF_EXPLODE)
2000  return ret;
2001  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2002  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2003  s->mb_x, s->mb_y,
2005  } else {
2006  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2007  s->mb_x - 1, s->mb_y,
2009  }
2010 
2011  if (s->mb_y == s->end_mb_y)
2012  return 0;
2013 
2014  start_code = -1;
2015  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2016  if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2017  return AVERROR_INVALIDDATA;
2019  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2020  mb_y += (*buf&0xE0)<<2;
2021  mb_y <<= field_pic;
2022  if (s->picture_structure == PICT_BOTTOM_FIELD)
2023  mb_y++;
2024  if (mb_y >= s->end_mb_y)
2025  return AVERROR_INVALIDDATA;
2026  }
2027 }
2028 
2029 /**
2030  * Handle slice ends.
2031  * @return 1 if it seems to be the last slice
2032  */
2033 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2034 {
2035  Mpeg1Context *s1 = avctx->priv_data;
2036  MpegEncContext *s = &s1->mpeg_enc_ctx;
2037 
2038  if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2039  return 0;
2040 
2041  if (s->avctx->hwaccel) {
2042  int ret = s->avctx->hwaccel->end_frame(s->avctx);
2043  if (ret < 0) {
2044  av_log(avctx, AV_LOG_ERROR,
2045  "hardware accelerator failed to decode picture\n");
2046  return ret;
2047  }
2048  }
2049 
2050  /* end of slice reached */
2051  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2052  /* end of image */
2053 
2054  ff_er_frame_end(&s->er);
2055 
2057 
2058  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2059  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2060  if (ret < 0)
2061  return ret;
2062  ff_print_debug_info(s, s->current_picture_ptr, pict);
2063  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2064  } else {
2065  if (avctx->active_thread_type & FF_THREAD_FRAME)
2066  s->picture_number++;
2067  /* latency of 1 frame for I- and P-frames */
2068  /* XXX: use another variable than picture_number */
2069  if (s->last_picture_ptr) {
2070  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2071  if (ret < 0)
2072  return ret;
2073  ff_print_debug_info(s, s->last_picture_ptr, pict);
2074  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2075  }
2076  }
2077 
2078  return 1;
2079  } else {
2080  return 0;
2081  }
2082 }
2083 
2085  const uint8_t *buf, int buf_size)
2086 {
2087  Mpeg1Context *s1 = avctx->priv_data;
2088  MpegEncContext *s = &s1->mpeg_enc_ctx;
2089  int width, height;
2090  int i, v, j;
2091 
2092  init_get_bits(&s->gb, buf, buf_size * 8);
2093 
2094  width = get_bits(&s->gb, 12);
2095  height = get_bits(&s->gb, 12);
2096  if (width == 0 || height == 0) {
2097  av_log(avctx, AV_LOG_WARNING,
2098  "Invalid horizontal or vertical size value.\n");
2100  return AVERROR_INVALIDDATA;
2101  }
2102  s->aspect_ratio_info = get_bits(&s->gb, 4);
2103  if (s->aspect_ratio_info == 0) {
2104  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2106  return AVERROR_INVALIDDATA;
2107  }
2108  s->frame_rate_index = get_bits(&s->gb, 4);
2109  if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2110  av_log(avctx, AV_LOG_WARNING,
2111  "frame_rate_index %d is invalid\n", s->frame_rate_index);
2112  s->frame_rate_index = 1;
2113  }
2114  s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2115  if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2116  return AVERROR_INVALIDDATA;
2117  }
2118 
2119  s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2120  skip_bits(&s->gb, 1);
2121 
2122  /* get matrix */
2123  if (get_bits1(&s->gb)) {
2124  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2125  } else {
2126  for (i = 0; i < 64; i++) {
2127  j = s->idsp.idct_permutation[i];
2129  s->intra_matrix[j] = v;
2130  s->chroma_intra_matrix[j] = v;
2131  }
2132  }
2133  if (get_bits1(&s->gb)) {
2134  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2135  } else {
2136  for (i = 0; i < 64; i++) {
2137  int j = s->idsp.idct_permutation[i];
2139  s->inter_matrix[j] = v;
2140  s->chroma_inter_matrix[j] = v;
2141  }
2142  }
2143 
2144  if (show_bits(&s->gb, 23) != 0) {
2145  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2146  return AVERROR_INVALIDDATA;
2147  }
2148 
2149  s->width = width;
2150  s->height = height;
2151 
2152  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2153  s->progressive_sequence = 1;
2154  s->progressive_frame = 1;
2155  s->picture_structure = PICT_FRAME;
2156  s->first_field = 0;
2157  s->frame_pred_frame_dct = 1;
2158  s->chroma_format = 1;
2159  s->codec_id =
2160  s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2161  s->out_format = FMT_MPEG1;
2162  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2163  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2164  s->low_delay = 1;
2165 
2166  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2167  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2168  s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2169 
2170  return 0;
2171 }
2172 
2174 {
2175  Mpeg1Context *s1 = avctx->priv_data;
2176  MpegEncContext *s = &s1->mpeg_enc_ctx;
2177  int i, v, ret;
2178 
2179  /* start new MPEG-1 context decoding */
2180  s->out_format = FMT_MPEG1;
2181  if (s1->mpeg_enc_ctx_allocated) {
2183  s1->mpeg_enc_ctx_allocated = 0;
2184  }
2185  s->width = avctx->coded_width;
2186  s->height = avctx->coded_height;
2187  avctx->has_b_frames = 0; // true?
2188  s->low_delay = 1;
2189 
2190  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2191  setup_hwaccel_for_pixfmt(avctx);
2192 
2194  if ((ret = ff_mpv_common_init(s)) < 0)
2195  return ret;
2196  s1->mpeg_enc_ctx_allocated = 1;
2197 
2198  for (i = 0; i < 64; i++) {
2199  int j = s->idsp.idct_permutation[i];
2201  s->intra_matrix[j] = v;
2202  s->chroma_intra_matrix[j] = v;
2203 
2205  s->inter_matrix[j] = v;
2206  s->chroma_inter_matrix[j] = v;
2207  }
2208 
2209  s->progressive_sequence = 1;
2210  s->progressive_frame = 1;
2211  s->picture_structure = PICT_FRAME;
2212  s->first_field = 0;
2213  s->frame_pred_frame_dct = 1;
2214  s->chroma_format = 1;
2215  if (s->codec_tag == AV_RL32("BW10")) {
2216  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2217  } else {
2218  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2219  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2220  }
2221  s1->save_width = s->width;
2222  s1->save_height = s->height;
2223  s1->save_progressive_seq = s->progressive_sequence;
2224  return 0;
2225 }
2226 
2228  const uint8_t *p, int buf_size)
2229 {
2230  Mpeg1Context *s1 = avctx->priv_data;
2231 
2232  if (buf_size >= 6 &&
2233  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2234  p[4] == 3 && (p[5] & 0x40)) {
2235  /* extract A53 Part 4 CC data */
2236  int cc_count = p[5] & 0x1f;
2237  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2238  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2239  const uint64_t new_size = (old_size + cc_count
2240  * UINT64_C(3));
2241  int ret;
2242 
2243  if (new_size > 3*A53_MAX_CC_COUNT)
2244  return AVERROR(EINVAL);
2245 
2246  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2247  if (ret >= 0)
2248  memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
2249 
2251  }
2252  return 1;
2253  } else if (buf_size >= 2 &&
2254  p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2255  /* extract SCTE-20 CC data */
2256  GetBitContext gb;
2257  int cc_count = 0;
2258  int i, ret;
2259 
2260  init_get_bits(&gb, p + 2, buf_size - 2);
2261  cc_count = get_bits(&gb, 5);
2262  if (cc_count > 0) {
2263  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2264  const uint64_t new_size = (old_size + cc_count
2265  * UINT64_C(3));
2266  if (new_size > 3*A53_MAX_CC_COUNT)
2267  return AVERROR(EINVAL);
2268 
2269  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2270  if (ret >= 0) {
2271  uint8_t field, cc1, cc2;
2272  uint8_t *cap = s1->a53_buf_ref->data;
2273 
2274  memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
2275  for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2276  skip_bits(&gb, 2); // priority
2277  field = get_bits(&gb, 2);
2278  skip_bits(&gb, 5); // line_offset
2279  cc1 = get_bits(&gb, 8);
2280  cc2 = get_bits(&gb, 8);
2281  skip_bits(&gb, 1); // marker
2282 
2283  if (!field) { // forbidden
2284  cap[0] = cap[1] = cap[2] = 0x00;
2285  } else {
2286  field = (field == 2 ? 1 : 0);
2287  if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2288  cap[0] = 0x04 | field;
2289  cap[1] = ff_reverse[cc1];
2290  cap[2] = ff_reverse[cc2];
2291  }
2292  cap += 3;
2293  }
2294  }
2296  }
2297  return 1;
2298  } else if (buf_size >= 11 &&
2299  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2300  /* extract DVD CC data
2301  *
2302  * uint32_t user_data_start_code 0x000001B2 (big endian)
2303  * uint16_t user_identifier 0x4343 "CC"
2304  * uint8_t user_data_type_code 0x01
2305  * uint8_t caption_block_size 0xF8
2306  * uint8_t
2307  * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2308  * bit 6 caption_filler 0
2309  * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2310  * bit 0 caption_extra_field_added 1=one additional caption word
2311  *
2312  * struct caption_field_block {
2313  * uint8_t
2314  * bit 7:1 caption_filler 0x7F (all 1s)
2315  * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2316  * uint8_t caption_first_byte
2317  * uint8_t caption_second_byte
2318  * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2319  *
2320  * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2321  * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2322  * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2323  * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2324  * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2325  int cc_count = 0;
2326  int i, ret;
2327  // There is a caption count field in the data, but it is often
2328  // incorrect. So count the number of captions present.
2329  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2330  cc_count++;
2331  // Transform the DVD format into A53 Part 4 format
2332  if (cc_count > 0) {
2333  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2334  const uint64_t new_size = (old_size + cc_count
2335  * UINT64_C(6));
2336  if (new_size > 3*A53_MAX_CC_COUNT)
2337  return AVERROR(EINVAL);
2338 
2339  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2340  if (ret >= 0) {
2341  uint8_t field1 = !!(p[4] & 0x80);
2342  uint8_t *cap = s1->a53_buf_ref->data;
2343  p += 5;
2344  for (i = 0; i < cc_count; i++) {
2345  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2346  cap[1] = p[1];
2347  cap[2] = p[2];
2348  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2349  cap[4] = p[4];
2350  cap[5] = p[5];
2351  cap += 6;
2352  p += 6;
2353  }
2354  }
2356  }
2357  return 1;
2358  }
2359  return 0;
2360 }
2361 
2363  const uint8_t *p, int buf_size)
2364 {
2365  Mpeg1Context *s = avctx->priv_data;
2366  const uint8_t *buf_end = p + buf_size;
2367  Mpeg1Context *s1 = avctx->priv_data;
2368 
2369 #if 0
2370  int i;
2371  for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2372  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2373  }
2374  av_log(avctx, AV_LOG_ERROR, "\n");
2375 #endif
2376 
2377  if (buf_size > 29){
2378  int i;
2379  for(i=0; i<20; i++)
2380  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2381  s->tmpgexs= 1;
2382  }
2383  }
2384  /* we parse the DTG active format information */
2385  if (buf_end - p >= 5 &&
2386  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2387  int flags = p[4];
2388  p += 5;
2389  if (flags & 0x80) {
2390  /* skip event id */
2391  p += 2;
2392  }
2393  if (flags & 0x40) {
2394  if (buf_end - p < 1)
2395  return;
2396  s1->has_afd = 1;
2397  s1->afd = p[0] & 0x0f;
2398  }
2399  } else if (buf_end - p >= 6 &&
2400  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2401  p[4] == 0x03) { // S3D_video_format_length
2402  // the 0x7F mask ignores the reserved_bit value
2403  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2404 
2405  if (S3D_video_format_type == 0x03 ||
2406  S3D_video_format_type == 0x04 ||
2407  S3D_video_format_type == 0x08 ||
2408  S3D_video_format_type == 0x23) {
2409 
2410  s1->has_stereo3d = 1;
2411 
2412  switch (S3D_video_format_type) {
2413  case 0x03:
2414  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2415  break;
2416  case 0x04:
2417  s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2418  break;
2419  case 0x08:
2420  s1->stereo3d.type = AV_STEREO3D_2D;
2421  break;
2422  case 0x23:
2423  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2424  break;
2425  }
2426  }
2427  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2428  return;
2429  }
2430 }
2431 
2432 static void mpeg_decode_gop(AVCodecContext *avctx,
2433  const uint8_t *buf, int buf_size)
2434 {
2435  Mpeg1Context *s1 = avctx->priv_data;
2436  MpegEncContext *s = &s1->mpeg_enc_ctx;
2437  int broken_link;
2438  int64_t tc;
2439 
2440  init_get_bits(&s->gb, buf, buf_size * 8);
2441 
2442  tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2443 
2444  s->closed_gop = get_bits1(&s->gb);
2445  /* broken_link indicates that after editing the
2446  * reference frames of the first B-Frames after GOP I-Frame
2447  * are missing (open gop) */
2448  broken_link = get_bits1(&s->gb);
2449 
2450  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2451  char tcbuf[AV_TIMECODE_STR_SIZE];
2453  av_log(s->avctx, AV_LOG_DEBUG,
2454  "GOP (%s) closed_gop=%d broken_link=%d\n",
2455  tcbuf, s->closed_gop, broken_link);
2456  }
2457 }
2458 
2459 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2460  int *got_output, const uint8_t *buf, int buf_size)
2461 {
2462  Mpeg1Context *s = avctx->priv_data;
2463  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2464  const uint8_t *buf_ptr = buf;
2465  const uint8_t *buf_end = buf + buf_size;
2466  int ret, input_size;
2467  int last_code = 0, skip_frame = 0;
2468  int picture_start_code_seen = 0;
2469 
2470  for (;;) {
2471  /* find next start code */
2472  uint32_t start_code = -1;
2473  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2474  if (start_code > 0x1ff) {
2475  if (!skip_frame) {
2476  if (HAVE_THREADS &&
2477  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2478  !avctx->hwaccel) {
2479  int i;
2480  av_assert0(avctx->thread_count > 1);
2481 
2482  avctx->execute(avctx, slice_decode_thread,
2483  &s2->thread_context[0], NULL,
2484  s->slice_count, sizeof(void *));
2485  for (i = 0; i < s->slice_count; i++)
2486  s2->er.error_count += s2->thread_context[i]->er.error_count;
2487  }
2488 
2489  ret = slice_end(avctx, picture);
2490  if (ret < 0)
2491  return ret;
2492  else if (ret) {
2493  // FIXME: merge with the stuff in mpeg_decode_slice
2494  if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2495  *got_output = 1;
2496  }
2497  }
2498  s2->pict_type = 0;
2499 
2500  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2501  return AVERROR_INVALIDDATA;
2502 
2503  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2504  }
2505 
2506  input_size = buf_end - buf_ptr;
2507 
2508  if (avctx->debug & FF_DEBUG_STARTCODE)
2509  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2510  start_code, buf_ptr - buf, input_size);
2511 
2512  /* prepare data for next start code */
2513  switch (start_code) {
2514  case SEQ_START_CODE:
2515  if (last_code == 0) {
2516  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2517  if (buf != avctx->extradata)
2518  s->sync = 1;
2519  } else {
2520  av_log(avctx, AV_LOG_ERROR,
2521  "ignoring SEQ_START_CODE after %X\n", last_code);
2522  if (avctx->err_recognition & AV_EF_EXPLODE)
2523  return AVERROR_INVALIDDATA;
2524  }
2525  break;
2526 
2527  case PICTURE_START_CODE:
2528  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2529  /* If it's a frame picture, there can't be more than one picture header.
2530  Yet, it does happen and we need to handle it. */
2531  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2532  break;
2533  }
2534  picture_start_code_seen = 1;
2535 
2536  if (s2->width <= 0 || s2->height <= 0) {
2537  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2538  s2->width, s2->height);
2539  return AVERROR_INVALIDDATA;
2540  }
2541 
2542  if (s->tmpgexs){
2543  s2->intra_dc_precision= 3;
2544  s2->intra_matrix[0]= 1;
2545  }
2546  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2547  !avctx->hwaccel && s->slice_count) {
2548  int i;
2549 
2550  avctx->execute(avctx, slice_decode_thread,
2551  s2->thread_context, NULL,
2552  s->slice_count, sizeof(void *));
2553  for (i = 0; i < s->slice_count; i++)
2554  s2->er.error_count += s2->thread_context[i]->er.error_count;
2555  s->slice_count = 0;
2556  }
2557  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2558  ret = mpeg_decode_postinit(avctx);
2559  if (ret < 0) {
2560  av_log(avctx, AV_LOG_ERROR,
2561  "mpeg_decode_postinit() failure\n");
2562  return ret;
2563  }
2564 
2565  /* We have a complete image: we try to decompress it. */
2566  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2567  s2->pict_type = 0;
2568  s->first_slice = 1;
2569  last_code = PICTURE_START_CODE;
2570  } else {
2571  av_log(avctx, AV_LOG_ERROR,
2572  "ignoring pic after %X\n", last_code);
2573  if (avctx->err_recognition & AV_EF_EXPLODE)
2574  return AVERROR_INVALIDDATA;
2575  }
2576  break;
2577  case EXT_START_CODE:
2578  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2579 
2580  switch (get_bits(&s2->gb, 4)) {
2581  case 0x1:
2582  if (last_code == 0) {
2584  } else {
2585  av_log(avctx, AV_LOG_ERROR,
2586  "ignoring seq ext after %X\n", last_code);
2587  if (avctx->err_recognition & AV_EF_EXPLODE)
2588  return AVERROR_INVALIDDATA;
2589  }
2590  break;
2591  case 0x2:
2593  break;
2594  case 0x3:
2596  break;
2597  case 0x7:
2599  break;
2600  case 0x8:
2601  if (last_code == PICTURE_START_CODE) {
2603  } else {
2604  av_log(avctx, AV_LOG_ERROR,
2605  "ignoring pic cod ext after %X\n", last_code);
2606  if (avctx->err_recognition & AV_EF_EXPLODE)
2607  return AVERROR_INVALIDDATA;
2608  }
2609  break;
2610  }
2611  break;
2612  case USER_START_CODE:
2613  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2614  break;
2615  case GOP_START_CODE:
2616  if (last_code == 0) {
2617  s2->first_field = 0;
2618  mpeg_decode_gop(avctx, buf_ptr, input_size);
2619  s->sync = 1;
2620  } else {
2621  av_log(avctx, AV_LOG_ERROR,
2622  "ignoring GOP_START_CODE after %X\n", last_code);
2623  if (avctx->err_recognition & AV_EF_EXPLODE)
2624  return AVERROR_INVALIDDATA;
2625  }
2626  break;
2627  default:
2629  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2630  if (s2->progressive_sequence && !s2->progressive_frame) {
2631  s2->progressive_frame = 1;
2632  av_log(s2->avctx, AV_LOG_ERROR,
2633  "interlaced frame in progressive sequence, ignoring\n");
2634  }
2635 
2636  if (s2->picture_structure == 0 ||
2637  (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2638  av_log(s2->avctx, AV_LOG_ERROR,
2639  "picture_structure %d invalid, ignoring\n",
2640  s2->picture_structure);
2641  s2->picture_structure = PICT_FRAME;
2642  }
2643 
2644  if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2645  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2646 
2647  if (s2->picture_structure == PICT_FRAME) {
2648  s2->first_field = 0;
2649  s2->v_edge_pos = 16 * s2->mb_height;
2650  } else {
2651  s2->first_field ^= 1;
2652  s2->v_edge_pos = 8 * s2->mb_height;
2653  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2654  }
2655  }
2657  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2658  const int field_pic = s2->picture_structure != PICT_FRAME;
2659  int mb_y = start_code - SLICE_MIN_START_CODE;
2660  last_code = SLICE_MIN_START_CODE;
2661  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2662  mb_y += (*buf_ptr&0xE0)<<2;
2663 
2664  mb_y <<= field_pic;
2665  if (s2->picture_structure == PICT_BOTTOM_FIELD)
2666  mb_y++;
2667 
2668  if (buf_end - buf_ptr < 2) {
2669  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2670  return AVERROR_INVALIDDATA;
2671  }
2672 
2673  if (mb_y >= s2->mb_height) {
2674  av_log(s2->avctx, AV_LOG_ERROR,
2675  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2676  return AVERROR_INVALIDDATA;
2677  }
2678 
2679  if (!s2->last_picture_ptr) {
2680  /* Skip B-frames if we do not have reference frames and
2681  * GOP is not closed. */
2682  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2683  if (!s2->closed_gop) {
2684  skip_frame = 1;
2685  av_log(s2->avctx, AV_LOG_DEBUG,
2686  "Skipping B slice due to open GOP\n");
2687  break;
2688  }
2689  }
2690  }
2691  if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2692  s->sync = 1;
2693  if (!s2->next_picture_ptr) {
2694  /* Skip P-frames if we do not have a reference frame or
2695  * we have an invalid header. */
2696  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2697  skip_frame = 1;
2698  av_log(s2->avctx, AV_LOG_DEBUG,
2699  "Skipping P slice due to !sync\n");
2700  break;
2701  }
2702  }
2703  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2704  s2->pict_type == AV_PICTURE_TYPE_B) ||
2705  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2706  s2->pict_type != AV_PICTURE_TYPE_I) ||
2707  avctx->skip_frame >= AVDISCARD_ALL) {
2708  skip_frame = 1;
2709  break;
2710  }
2711 
2712  if (!s->mpeg_enc_ctx_allocated)
2713  break;
2714 
2715  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2716  if (mb_y < avctx->skip_top ||
2717  mb_y >= s2->mb_height - avctx->skip_bottom)
2718  break;
2719  }
2720 
2721  if (!s2->pict_type) {
2722  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2723  if (avctx->err_recognition & AV_EF_EXPLODE)
2724  return AVERROR_INVALIDDATA;
2725  break;
2726  }
2727 
2728  if (s->first_slice) {
2729  skip_frame = 0;
2730  s->first_slice = 0;
2731  if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2732  return ret;
2733  }
2734  if (!s2->current_picture_ptr) {
2735  av_log(avctx, AV_LOG_ERROR,
2736  "current_picture not initialized\n");
2737  return AVERROR_INVALIDDATA;
2738  }
2739 
2740  if (HAVE_THREADS &&
2741  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2742  !avctx->hwaccel) {
2743  int threshold = (s2->mb_height * s->slice_count +
2744  s2->slice_context_count / 2) /
2745  s2->slice_context_count;
2746  av_assert0(avctx->thread_count > 1);
2747  if (threshold <= mb_y) {
2748  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2749 
2750  thread_context->start_mb_y = mb_y;
2751  thread_context->end_mb_y = s2->mb_height;
2752  if (s->slice_count) {
2753  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2754  ret = ff_update_duplicate_context(thread_context, s2);
2755  if (ret < 0)
2756  return ret;
2757  }
2758  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2759  s->slice_count++;
2760  }
2761  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2762  } else {
2763  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2764  emms_c();
2765 
2766  if (ret < 0) {
2767  if (avctx->err_recognition & AV_EF_EXPLODE)
2768  return ret;
2769  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2770  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2771  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2773  } else {
2774  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2775  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2777  }
2778  }
2779  }
2780  break;
2781  }
2782  }
2783 }
2784 
2785 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2786  int *got_output, AVPacket *avpkt)
2787 {
2788  const uint8_t *buf = avpkt->data;
2789  int ret;
2790  int buf_size = avpkt->size;
2791  Mpeg1Context *s = avctx->priv_data;
2792  AVFrame *picture = data;
2793  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2794 
2795  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2796  /* special case for last picture */
2797  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2798  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2799  if (ret < 0)
2800  return ret;
2801 
2802  s2->next_picture_ptr = NULL;
2803 
2804  *got_output = 1;
2805  }
2806  return buf_size;
2807  }
2808 
2809  if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2810  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2811  buf_size, NULL);
2812 
2813  if (ff_combine_frame(&s2->parse_context, next,
2814  (const uint8_t **) &buf, &buf_size) < 0)
2815  return buf_size;
2816  }
2817 
2818  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2819  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2820  || s2->codec_tag == AV_RL32("BW10")
2821  ))
2822  vcr2_init_sequence(avctx);
2823 
2824  s->slice_count = 0;
2825 
2826  if (avctx->extradata && !s->extradata_decoded) {
2827  ret = decode_chunks(avctx, picture, got_output,
2828  avctx->extradata, avctx->extradata_size);
2829  if (*got_output) {
2830  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2831  av_frame_unref(picture);
2832  *got_output = 0;
2833  }
2834  s->extradata_decoded = 1;
2835  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2836  s2->current_picture_ptr = NULL;
2837  return ret;
2838  }
2839  }
2840 
2841  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2842  if (ret<0 || *got_output) {
2843  s2->current_picture_ptr = NULL;
2844 
2845  if (s2->timecode_frame_start != -1 && *got_output) {
2846  char tcbuf[AV_TIMECODE_STR_SIZE];
2847  AVFrameSideData *tcside = av_frame_new_side_data(picture,
2849  sizeof(int64_t));
2850  if (!tcside)
2851  return AVERROR(ENOMEM);
2852  memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2853 
2854  av_timecode_make_mpeg_tc_string(tcbuf, s2->timecode_frame_start);
2855  av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
2856 
2857  s2->timecode_frame_start = -1;
2858  }
2859  }
2860 
2861  return ret;
2862 }
2863 
2864 static void flush(AVCodecContext *avctx)
2865 {
2866  Mpeg1Context *s = avctx->priv_data;
2867 
2868  s->sync = 0;
2869 
2870  ff_mpeg_flush(avctx);
2871 }
2872 
2874 {
2875  Mpeg1Context *s = avctx->priv_data;
2876 
2877  if (s->mpeg_enc_ctx_allocated)
2878  ff_mpv_common_end(&s->mpeg_enc_ctx);
2879  av_buffer_unref(&s->a53_buf_ref);
2880  return 0;
2881 }
2882 
2884  .name = "mpeg1video",
2885  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2886  .type = AVMEDIA_TYPE_VIDEO,
2887  .id = AV_CODEC_ID_MPEG1VIDEO,
2888  .priv_data_size = sizeof(Mpeg1Context),
2890  .close = mpeg_decode_end,
2895  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
2897  .flush = flush,
2898  .max_lowres = 3,
2899  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2900  .hw_configs = (const AVCodecHWConfigInternal *const []) {
2901 #if CONFIG_MPEG1_NVDEC_HWACCEL
2902  HWACCEL_NVDEC(mpeg1),
2903 #endif
2904 #if CONFIG_MPEG1_VDPAU_HWACCEL
2905  HWACCEL_VDPAU(mpeg1),
2906 #endif
2907 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2908  HWACCEL_VIDEOTOOLBOX(mpeg1),
2909 #endif
2910 #if CONFIG_MPEG1_XVMC_HWACCEL
2911  HWACCEL_XVMC(mpeg1),
2912 #endif
2913  NULL
2914  },
2915 };
2916 
2918  .name = "mpeg2video",
2919  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2920  .type = AVMEDIA_TYPE_VIDEO,
2921  .id = AV_CODEC_ID_MPEG2VIDEO,
2922  .priv_data_size = sizeof(Mpeg1Context),
2924  .close = mpeg_decode_end,
2929  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
2931  .flush = flush,
2932  .max_lowres = 3,
2934  .hw_configs = (const AVCodecHWConfigInternal *const []) {
2935 #if CONFIG_MPEG2_DXVA2_HWACCEL
2936  HWACCEL_DXVA2(mpeg2),
2937 #endif
2938 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2939  HWACCEL_D3D11VA(mpeg2),
2940 #endif
2941 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2942  HWACCEL_D3D11VA2(mpeg2),
2943 #endif
2944 #if CONFIG_MPEG2_NVDEC_HWACCEL
2945  HWACCEL_NVDEC(mpeg2),
2946 #endif
2947 #if CONFIG_MPEG2_VAAPI_HWACCEL
2948  HWACCEL_VAAPI(mpeg2),
2949 #endif
2950 #if CONFIG_MPEG2_VDPAU_HWACCEL
2951  HWACCEL_VDPAU(mpeg2),
2952 #endif
2953 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2954  HWACCEL_VIDEOTOOLBOX(mpeg2),
2955 #endif
2956 #if CONFIG_MPEG2_XVMC_HWACCEL
2957  HWACCEL_XVMC(mpeg2),
2958 #endif
2959  NULL
2960  },
2961 };
2962 
2963 //legacy decoder
2965  .name = "mpegvideo",
2966  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2967  .type = AVMEDIA_TYPE_VIDEO,
2968  .id = AV_CODEC_ID_MPEG2VIDEO,
2969  .priv_data_size = sizeof(Mpeg1Context),
2971  .close = mpeg_decode_end,
2974  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
2976  .flush = flush,
2977  .max_lowres = 3,
2978 };
2979 
2980 typedef struct IPUContext {
2982 
2983  int flags;
2984  DECLARE_ALIGNED(32, int16_t, block)[6][64];
2985 } IPUContext;
2986 
2987 static int ipu_decode_frame(AVCodecContext *avctx, void *data,
2988  int *got_frame, AVPacket *avpkt)
2989 {
2990  IPUContext *s = avctx->priv_data;
2991  MpegEncContext *m = &s->m;
2992  GetBitContext *gb = &m->gb;
2993  AVFrame * const frame = data;
2994  int ret;
2995 
2996  ret = ff_get_buffer(avctx, frame, 0);
2997  if (ret < 0)
2998  return ret;
2999 
3000  ret = init_get_bits8(gb, avpkt->data, avpkt->size);
3001  if (ret < 0)
3002  return ret;
3003 
3004  s->flags = get_bits(gb, 8);
3005  m->intra_dc_precision = s->flags & 3;
3006  m->q_scale_type = !!(s->flags & 0x40);
3007  m->intra_vlc_format = !!(s->flags & 0x20);
3008  m->alternate_scan = !!(s->flags & 0x10);
3009 
3010  if (s->flags & 0x10) {
3013  } else {
3016  }
3017 
3018  m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3));
3019  m->qscale = 1;
3020 
3021  for (int y = 0; y < avctx->height; y += 16) {
3022  int intraquant;
3023 
3024  for (int x = 0; x < avctx->width; x += 16) {
3025  if (x || y) {
3026  if (!get_bits1(gb))
3027  return AVERROR_INVALIDDATA;
3028  }
3029  if (get_bits1(gb)) {
3030  intraquant = 0;
3031  } else {
3032  if (!get_bits1(gb))
3033  return AVERROR_INVALIDDATA;
3034  intraquant = 1;
3035  }
3036 
3037  if (s->flags & 4)
3038  skip_bits1(gb);
3039 
3040  if (intraquant)
3041  m->qscale = mpeg_get_qscale(m);
3042 
3043  memset(s->block, 0, sizeof(s->block));
3044 
3045  for (int n = 0; n < 6; n++) {
3046  if (s->flags & 0x80) {
3048  m->intra_matrix,
3050  m->last_dc, s->block[n],
3051  n, m->qscale);
3052  if (ret >= 0)
3053  m->block_last_index[n] = ret;
3054  } else {
3055  ret = mpeg2_decode_block_intra(m, s->block[n], n);
3056  }
3057 
3058  if (ret < 0)
3059  return ret;
3060  }
3061 
3062  m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
3063  frame->linesize[0], s->block[0]);
3064  m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
3065  frame->linesize[0], s->block[1]);
3066  m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
3067  frame->linesize[0], s->block[2]);
3068  m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
3069  frame->linesize[0], s->block[3]);
3070  m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
3071  frame->linesize[1], s->block[4]);
3072  m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
3073  frame->linesize[2], s->block[5]);
3074  }
3075  }
3076 
3077  align_get_bits(gb);
3078  if (get_bits_left(gb) != 32)
3079  return AVERROR_INVALIDDATA;
3080 
3081  frame->pict_type = AV_PICTURE_TYPE_I;
3082  frame->key_frame = 1;
3083  *got_frame = 1;
3084 
3085  return avpkt->size;
3086 }
3087 
3089 {
3090  IPUContext *s = avctx->priv_data;
3091  MpegEncContext *m = &s->m;
3092 
3093  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
3094 
3095  ff_mpv_decode_init(m, avctx);
3096  ff_mpv_idct_init(m);
3099 
3100  for (int i = 0; i < 64; i++) {
3101  int j = m->idsp.idct_permutation[i];
3103  m->intra_matrix[j] = v;
3104  m->chroma_intra_matrix[j] = v;
3105  }
3106 
3107  for (int i = 0; i < 64; i++) {
3108  int j = m->idsp.idct_permutation[i];
3110  m->inter_matrix[j] = v;
3111  m->chroma_inter_matrix[j] = v;
3112  }
3113 
3114  return 0;
3115 }
3116 
3118 {
3119  IPUContext *s = avctx->priv_data;
3120 
3121  ff_mpv_common_end(&s->m);
3122 
3123  return 0;
3124 }
3125 
3127  .name = "ipu",
3128  .long_name = NULL_IF_CONFIG_SMALL("IPU Video"),
3129  .type = AVMEDIA_TYPE_VIDEO,
3130  .id = AV_CODEC_ID_IPU,
3131  .priv_data_size = sizeof(IPUContext),
3132  .init = ipu_decode_init,
3134  .close = ipu_decode_end,
3135  .capabilities = AV_CODEC_CAP_DR1,
3137 };
PICT_FRAME
#define PICT_FRAME
Definition: mpegutils.h:38
vcr2_init_sequence
static int vcr2_init_sequence(AVCodecContext *avctx)
Definition: mpeg12dec.c:2173
ipu_decode_frame
static int ipu_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mpeg12dec.c:2987
ff_mpv_common_init
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:913
hwconfig.h
AVCodecContext::hwaccel
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1355
AVCodec
AVCodec.
Definition: codec.h:197
ff_rl_mpeg2
RLTable ff_rl_mpeg2
Definition: mpeg12data.c:174
MB_TYPE_L0
#define MB_TYPE_L0
Definition: mpegutils.h:66
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
Mpeg1Context::has_afd
int has_afd
Definition: mpeg12dec.c:65
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AV_TIMECODE_STR_SIZE
#define AV_TIMECODE_STR_SIZE
Definition: timecode.h:33
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
AV_PIX_FMT_CUDA
@ AV_PIX_FMT_CUDA
HW acceleration through CUDA.
Definition: pixfmt.h:225
ff_init_scantable
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
level
uint8_t level
Definition: svq3.c:204
Mpeg1Context::a53_buf_ref
AVBufferRef * a53_buf_ref
Definition: mpeg12dec.c:63
ff_mpeg2_aspect
const AVRational ff_mpeg2_aspect[16]
Definition: mpeg12data.c:395
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
show_bits_long
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:603
mpeg_decode_a53_cc
static int mpeg_decode_a53_cc(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2227
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:850
FMT_MPEG1
@ FMT_MPEG1
Definition: mpegutils.h:123
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AV_STEREO3D_SIDEBYSIDE_QUINCUNX
@ AV_STEREO3D_SIDEBYSIDE_QUINCUNX
Views are next to each other, but when upscaling apply a checkerboard pattern.
Definition: stereo3d.h:117
mem_internal.h
MpegEncContext::gb
GetBitContext gb
Definition: mpegvideo.h:450
mpeg_decode_frame
static int mpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_output, AVPacket *avpkt)
Definition: mpeg12dec.c:2785
av_frame_new_side_data
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, size_t size)
Add a new side data to a frame.
Definition: frame.c:605
check_scantable_index
#define check_scantable_index(ctx, x)
Definition: mpeg12dec.c:131
AV_FRAME_DATA_A53_CC
@ AV_FRAME_DATA_A53_CC
ATSC A53 Part 4 Closed Captions.
Definition: frame.h:58
MT_FIELD
#define MT_FIELD
Definition: mpeg12dec.c:647
EXT_START_CODE
#define EXT_START_CODE
Definition: cavs.h:35
MV_TYPE_16X8
#define MV_TYPE_16X8
2 vectors, one per 16x8 block
Definition: mpegvideo.h:268
ff_mbincr_vlc
VLC ff_mbincr_vlc
Definition: mpeg12.c:131
av_div_q
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
mpeg_get_qscale
static int mpeg_get_qscale(MpegEncContext *s)
Definition: mpegvideo.h:774
AVPanScan
Pan Scan area.
Definition: defs.h:75
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1320
SLICE_MAX_START_CODE
#define SLICE_MAX_START_CODE
Definition: cavs.h:34
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: mpegutils.h:54
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:220
ipu_decode_init
static av_cold int ipu_decode_init(AVCodecContext *avctx)
Definition: mpeg12dec.c:3088
SEQ_START_CODE
#define SEQ_START_CODE
Definition: mpegvideo.h:68
AV_CODEC_CAP_TRUNCATED
#define AV_CODEC_CAP_TRUNCATED
Definition: codec.h:53
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
start_code
static const uint8_t start_code[]
Definition: videotoolboxenc.c:191
ff_mpeg12_common_init
av_cold void ff_mpeg12_common_init(MpegEncContext *s)
Definition: mpeg12.c:106
avpriv_toupper4
unsigned int avpriv_toupper4(unsigned int x)
Definition: utils.c:869
w
uint8_t w
Definition: llviddspenc.c:38
HWACCEL_DXVA2
#define HWACCEL_DXVA2(codec)
Definition: hwconfig.h:67
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
ipu_decode_end
static av_cold int ipu_decode_end(AVCodecContext *avctx)
Definition: mpeg12dec.c:3117
mpeg_decode_mb
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpeg12dec.c:652
mpeg2_decode_block_intra
static int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:476
HWACCEL_D3D11VA2
#define HWACCEL_D3D11VA2(codec)
Definition: hwconfig.h:69
ff_reverse
const uint8_t ff_reverse[256]
Definition: reverse.c:23
MpegEncContext::last_dc
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:185
data
const char data[16]
Definition: mxf.c:143
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: mpegutils.h:53
HWACCEL_XVMC
#define HWACCEL_XVMC(codec)
Definition: hwconfig.h:81
AV_PIX_FMT_D3D11VA_VLD
@ AV_PIX_FMT_D3D11VA_VLD
HW decoding through Direct3D11 via old API, Picture.data[3] contains a ID3D11VideoDecoderOutputView p...
Definition: pixfmt.h:219
mpeg2_fast_decode_block_intra
static int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
Changing this would eat up any speed benefits it has.
Definition: mpeg12dec.c:562
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:798
PICT_BOTTOM_FIELD
#define PICT_BOTTOM_FIELD
Definition: mpegutils.h:37
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:829
ff_init_block_index
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2267
ff_tlog
#define ff_tlog(ctx,...)
Definition: internal.h:97
mpegvideo.h
AV_EF_COMPLIANT
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:1335
MB_TYPE_L1
#define MB_TYPE_L1
Definition: mpegutils.h:67
avpriv_find_start_code
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:179
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
Mpeg1Context::first_slice
int first_slice
Definition: mpeg12dec.c:73
ER_DC_END
#define ER_DC_END
Definition: error_resilience.h:35
mpeg_decode_postinit
static int mpeg_decode_postinit(AVCodecContext *avctx)
Definition: mpeg12dec.c:1201
ff_add_cpb_side_data
AVCPBProperties * ff_add_cpb_side_data(AVCodecContext *avctx)
Add a CPB properties side data to an encoding context.
Definition: utils.c:1001
mpegutils.h
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:1394
ER_MV_ERROR
#define ER_MV_ERROR
Definition: error_resilience.h:33
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:660
thread.h
ff_mb_pat_vlc
VLC ff_mb_pat_vlc
Definition: mpeg12.c:134
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1299
MV_TYPE_DMV
#define MV_TYPE_DMV
2 vectors, special mpeg2 Dual Prime Vectors
Definition: mpegvideo.h:270
GET_CACHE
#define GET_CACHE(name, gb)
Definition: get_bits.h:216
FF_IDCT_NONE
#define FF_IDCT_NONE
Definition: avcodec.h:1406
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:468
Mpeg1Context::save_aspect
AVRational save_aspect
Definition: mpeg12dec.c:67
MpegEncContext::intra_scantable
ScanTable intra_scantable
Definition: mpegvideo.h:91
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:1706
AV_STEREO3D_SIDEBYSIDE
@ AV_STEREO3D_SIDEBYSIDE
Views are next to each other.
Definition: stereo3d.h:67
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
MB_TYPE_ZERO_MV
#define MB_TYPE_ZERO_MV
Definition: mpeg12dec.c:77
MT_DMV
#define MT_DMV
Definition: mpeg12dec.c:650
ParseContext
Definition: parser.h:28
decode_chunks
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture, int *got_output, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2459
AVCodecContext::skip_frame
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:1669
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:237
mpeg_decode_quant_matrix_extension
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
Definition: mpeg12dec.c:1518
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
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1436
AV_STEREO3D_2D
@ AV_STEREO3D_2D
Video is not stereoscopic (and metadata has to be there).
Definition: stereo3d.h:55
wrap
#define wrap(func)
Definition: neontest.h:65
PICTURE_START_CODE
#define PICTURE_START_CODE
Definition: mpegvideo.h:70
RLTable
RLTable.
Definition: rl.h:39
GetBitContext
Definition: get_bits.h:62
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:98
ff_mpeg_draw_horiz_band
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
Definition: mpegvideo.c:2260
slice_decode_thread
static int slice_decode_thread(AVCodecContext *c, void *arg)
Definition: mpeg12dec.c:1980
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
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:459
IDCTDSPContext::idct_put
void(* idct_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:72
MB_TYPE_CBP
#define MB_TYPE_CBP
Definition: mpegutils.h:70
val
static double val(void *priv, double ch)
Definition: aeval.c:75
Mpeg1Context::tmpgexs
int tmpgexs
Definition: mpeg12dec.c:72
HWACCEL_VDPAU
#define HWACCEL_VDPAU(codec)
Definition: hwconfig.h:75
AV_CODEC_FLAG_LOW_DELAY
#define AV_CODEC_FLAG_LOW_DELAY
Force low delay.
Definition: avcodec.h:260
mpeg12_pixfmt_list_444
static enum AVPixelFormat mpeg12_pixfmt_list_444[]
Definition: mpeg12dec.c:1158
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:567
mpeg1_decode_sequence
static int mpeg1_decode_sequence(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2084
av_reduce
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
HAS_CBP
#define HAS_CBP(a)
Definition: mpegutils.h:100
AVRational::num
int num
Numerator.
Definition: rational.h:59
HWACCEL_VIDEOTOOLBOX
@ HWACCEL_VIDEOTOOLBOX
Definition: ffmpeg.h:63
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:62
AV_EF_BITSTREAM
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:1329
IPUContext
Definition: mpeg12dec.c:2980
mpeg1_hwaccel_pixfmt_list_420
static enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[]
Definition: mpeg12dec.c:1112
ff_mpv_common_end
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1111
mpeg12.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
ER_DC_ERROR
#define ER_DC_ERROR
Definition: error_resilience.h:32
av_cold
#define av_cold
Definition: attributes.h:90
mpeg2_hwaccel_pixfmt_list_420
static enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[]
Definition: mpeg12dec.c:1126
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:678
mpeg1_decode_picture
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:1338
flush
static void flush(AVCodecContext *avctx)
Definition: mpeg12dec.c:2864
Mpeg1Context::save_progressive_seq
int save_progressive_seq
Definition: mpeg12dec.c:68
ff_rl_mpeg1
RLTable ff_rl_mpeg1
Definition: mpeg12data.c:166
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:150
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:481
AVCodecContext::has_b_frames
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:675
A53_MAX_CC_COUNT
#define A53_MAX_CC_COUNT
Definition: mpeg12dec.c:54
Mpeg1Context::repeat_field
int repeat_field
Definition: mpeg12dec.c:59
width
#define width
stereo3d.h
AV_PIX_FMT_DXVA2_VLD
@ AV_PIX_FMT_DXVA2_VLD
HW decoding through DXVA2, Picture.data[3] contains a LPDIRECT3DSURFACE9 pointer.
Definition: pixfmt.h:127
s
#define s(width, name)
Definition: cbs_vp9.c:257
ff_mpeg1_aspect
const float ff_mpeg1_aspect[16]
Definition: mpeg12data.c:374
FF_QSCALE_TYPE_MPEG2
#define FF_QSCALE_TYPE_MPEG2
Definition: internal.h:104
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:511
s1
#define s1
Definition: regdef.h:38
slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2033
Mpeg1Context::mpeg_enc_ctx_allocated
int mpeg_enc_ctx_allocated
Definition: mpeg12dec.c:58
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:213
ff_mpeg_er_frame_start
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:46
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:290
mpeg_decode_sequence_display_extension
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1437
Mpeg1Context::pan_scan
AVPanScan pan_scan
Definition: mpeg12dec.c:60
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:360
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
ctx
AVFormatContext * ctx
Definition: movenc.c:48
PICT_TOP_FIELD
#define PICT_TOP_FIELD
Definition: mpegutils.h:36
mpeg12_pixfmt_list_422
static enum AVPixelFormat mpeg12_pixfmt_list_422[]
Definition: mpeg12dec.c:1153
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:194
IS_INTRA
#define IS_INTRA(x, y)
field
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this field
Definition: writing_filters.txt:78
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
AVCodecContext::rc_max_rate
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:1190
ff_mpeg1video_decoder
const AVCodec ff_mpeg1video_decoder
Definition: mpeg12dec.c:2883
AVCPBProperties
This structure describes the bitrate properties of an encoded bitstream.
Definition: defs.h:104
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:389
arg
const char * arg
Definition: jacosubdec.c:67
if
if(ret)
Definition: filter_design.txt:179
AVDISCARD_ALL
@ AVDISCARD_ALL
discard all
Definition: defs.h:54
Mpeg1Context::rc_buffer_size
int rc_buffer_size
Definition: mpeg12dec.c:69
MB_PTYPE_VLC_BITS
#define MB_PTYPE_VLC_BITS
Definition: mpeg12vlc.h:39
Mpeg1Context::save_width
int save_width
Definition: mpeg12dec.c:68
PTRDIFF_SPECIFIER
#define PTRDIFF_SPECIFIER
Definition: internal.h:191
NULL
#define NULL
Definition: coverity.c:32
run
uint8_t run
Definition: svq3.c:203
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:963
av_buffer_unref
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:125
ER_AC_ERROR
#define ER_AC_ERROR
Definition: error_resilience.h:31
ff_mpv_idct_init
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:331
Mpeg1Context::sync
int sync
Definition: mpeg12dec.c:71
AVCHROMA_LOC_LEFT
@ AVCHROMA_LOC_LEFT
MPEG-2/4 4:2:0, H.264 default for 4:2:0.
Definition: pixfmt.h:597
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVCHROMA_LOC_TOPLEFT
@ AVCHROMA_LOC_TOPLEFT
ITU-R 601, SMPTE 274M 296M S314M(DV 4:1:1), mpeg2 4:2:2.
Definition: pixfmt.h:599
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:429
mpeg_decode_picture_display_extension
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1461
MpegEncContext::inter_matrix
uint16_t inter_matrix[64]
Definition: mpegvideo.h:302
AV_CODEC_FLAG2_FAST
#define AV_CODEC_FLAG2_FAST
Allow non spec compliant speedup tricks.
Definition: avcodec.h:283
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:499
SEQ_END_CODE
#define SEQ_END_CODE
Definition: mpegvideo.h:67
profiles.h
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:252
AV_PIX_FMT_XVMC
@ AV_PIX_FMT_XVMC
XVideo Motion Acceleration via common packet passing.
Definition: pixfmt.h:263
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:200
MB_TYPE_QUANT
#define MB_TYPE_QUANT
Definition: mpegutils.h:69
lowres
static int lowres
Definition: ffplay.c:334
av_frame_new_side_data_from_buf
AVFrameSideData * av_frame_new_side_data_from_buf(AVFrame *frame, enum AVFrameSideDataType type, AVBufferRef *buf)
Add a new side data to a frame from an existing AVBufferRef.
Definition: frame.c:573
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:155
MB_BTYPE_VLC_BITS
#define MB_BTYPE_VLC_BITS
Definition: mpeg12vlc.h:40
xvmc_internal.h
ff_mpegvideo_decoder
const AVCodec ff_mpegvideo_decoder
Definition: mpeg12dec.c:2964
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1331
AV_FRAME_DATA_AFD
@ AV_FRAME_DATA_AFD
Active Format Description data consisting of a single byte as specified in ETSI TS 101 154 using AVAc...
Definition: frame.h:89
AVCodecContext::level
int level
level
Definition: avcodec.h:1647
Mpeg1Context::save_height
int save_height
Definition: mpeg12dec.c:68
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AV_CODEC_ID_MPEG1VIDEO
@ AV_CODEC_ID_MPEG1VIDEO
Definition: codec_id.h:51
MpegEncContext::idsp
IDCTDSPContext idsp
Definition: mpegvideo.h:230
ff_mb_ptype_vlc
VLC ff_mb_ptype_vlc
Definition: mpeg12.c:132
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
quant_matrix_rebuild
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, const uint8_t *new_perm)
Definition: mpeg12dec.c:1100
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:175
s2
#define s2
Definition: regdef.h:39
AVDISCARD_NONKEY
@ AVDISCARD_NONKEY
discard all frames except keyframes
Definition: defs.h:53
AVCodecContext::flags2
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:466
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1648
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AV_CODEC_FLAG_GRAY
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:243
AVPacket::size
int size
Definition: packet.h:374
dc
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled top and top right vectors is used as motion vector prediction the used motion vector is the sum of the predictor and(mvx_diff, mvy_diff) *mv_scale Intra DC Prediction block[y][x] dc[1]
Definition: snow.txt:400
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:116
MpegEncContext::qscale
int qscale
QP.
Definition: mpegvideo.h:204
AV_CODEC_ID_IPU
@ AV_CODEC_ID_IPU
Definition: codec_id.h:305
AV_FRAME_DATA_PANSCAN
@ AV_FRAME_DATA_PANSCAN
The data is the AVPanScan struct defined in libavcodec.
Definition: frame.h:52
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:327
MT_FRAME
#define MT_FRAME
Definition: mpeg12dec.c:648
SLICE_MIN_START_CODE
#define SLICE_MIN_START_CODE
Definition: mpegvideo.h:71
IPUContext::flags
int flags
Definition: mpeg12dec.c:2983
MpegEncContext::intra_matrix
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:300
ff_mpeg1_clean_buffers
void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:114
GOP_START_CODE
#define GOP_START_CODE
Definition: mpegvideo.h:69
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
AVFrameSideData::data
uint8_t * data
Definition: frame.h:211
MB_TYPE_SKIP
#define MB_TYPE_SKIP
Definition: mpegutils.h:61
FF_THREAD_SLICE
#define FF_THREAD_SLICE
Decode more than one part of a single frame at once.
Definition: avcodec.h:1448
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2300
USER_START_CODE
#define USER_START_CODE
Definition: cavs.h:36
AVCodecContext::skip_bottom
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:894
AVCodecHWConfigInternal
Definition: hwconfig.h:29
ff_mpeg1_default_intra_matrix
const uint16_t ff_mpeg1_default_intra_matrix[256]
Definition: mpeg12data.c:30
MB_TYPE_INTERLACED
#define MB_TYPE_INTERLACED
Definition: mpegutils.h:57
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:139
height
#define height
ff_mpeg_update_thread_context
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: mpegvideo.c:524
Mpeg1Context::has_stereo3d
int has_stereo3d
Definition: mpeg12dec.c:62
mpeg_decode_init
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
Definition: mpeg12dec.c:1049
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: codec.h:112
HWACCEL_D3D11VA
#define HWACCEL_D3D11VA(codec)
Definition: hwconfig.h:79
mpegvideodata.h
attributes.h
MV_TYPE_FIELD
#define MV_TYPE_FIELD
2 vectors, one per field
Definition: mpegvideo.h:269
ff_mpv_export_qp_table
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:1420
skip_bits1
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:539
AV_PIX_FMT_D3D11
@ AV_PIX_FMT_D3D11
Hardware surfaces for Direct3D11.
Definition: pixfmt.h:303
ff_print_debug_info
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:1413
ff_ipu_decoder
const AVCodec ff_ipu_decoder
Definition: mpeg12dec.c:3126
HWACCEL_NVDEC
#define HWACCEL_NVDEC(codec)
Definition: hwconfig.h:71
AV_PIX_FMT_VAAPI
@ AV_PIX_FMT_VAAPI
Hardware acceleration through VA-API, data[3] contains a VASurfaceID.
Definition: pixfmt.h:119
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:197
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1447
ff_mpeg2_video_profiles
const AVProfile ff_mpeg2_video_profiles[]
Definition: profiles.c:100
AV_PIX_FMT_VDPAU
@ AV_PIX_FMT_VDPAU
HW acceleration through VDPAU, Picture.data[3] contains a VdpVideoSurface.
Definition: pixfmt.h:187
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
MB_TYPE_L0L1
#define MB_TYPE_L0L1
Definition: mpegutils.h:68
AV_PIX_FMT_VIDEOTOOLBOX
@ AV_PIX_FMT_VIDEOTOOLBOX
hardware decoding through Videotoolbox
Definition: pixfmt.h:272
MpegEncContext::block_last_index
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:86
mpeg_decode_gop
static void mpeg_decode_gop(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2432
setup_hwaccel_for_pixfmt
static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
Definition: mpeg12dec.c:1184
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
MpegEncContext::chroma_inter_matrix
uint16_t chroma_inter_matrix[64]
Definition: mpegvideo.h:303
i
int i
Definition: input.c:406
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
AV_CODEC_FLAG2_SHOW_ALL
#define AV_CODEC_FLAG2_SHOW_ALL
Show all frames before the first keyframe.
Definition: avcodec.h:311
AVCodecContext::properties
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:1818
ff_alternate_vertical_scan
const uint8_t ff_alternate_vertical_scan[64]
Definition: mpegvideodata.c:95
btype2mb_type
static const uint32_t btype2mb_type[11]
Definition: mpeg12dec.c:89
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:480
AVHWAccel::decode_slice
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:2123
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:447
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:50
internal.h
AV_STEREO3D_TOPBOTTOM
@ AV_STEREO3D_TOPBOTTOM
Views are on top of each other.
Definition: stereo3d.h:79
AVCPBProperties::max_bitrate
int64_t max_bitrate
Maximum bitrate of the stream, in bits per second.
Definition: defs.h:109
IS_QUANT
#define IS_QUANT(a)
Definition: mpegutils.h:94
ff_mpeg12_init_vlcs
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:165
FF_DEBUG_STARTCODE
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:1306
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
MB_PAT_VLC_BITS
#define MB_PAT_VLC_BITS
Definition: mpeg12vlc.h:38
mpeg1_decode_block_inter
static int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:140
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:437
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1393
ptype2mb_type
static const uint32_t ptype2mb_type[7]
Definition: mpeg12dec.c:79
IPUContext::m
MpegEncContext m
Definition: mpeg12dec.c:2981
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
update_thread_context
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have update_thread_context() run it in the next thread. Add AV_CODEC_CAP_FRAME_THREADS to the codec capabilities. There will be very little speed gain at this point but it should work. If there are inter-frame dependencies
MpegEncContext::intra_vlc_format
int intra_vlc_format
Definition: mpegvideo.h:472
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:970
MAX_INDEX
#define MAX_INDEX
Definition: mpeg12dec.c:130
AVCodecContext::height
int height
Definition: avcodec.h:552
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:589
ff_mpv_frame_end
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1405
AVCOL_RANGE_MPEG
@ AVCOL_RANGE_MPEG
Narrow or limited range content.
Definition: pixfmt.h:559
Mpeg1Context::stereo3d
AVStereo3D stereo3d
Definition: mpeg12dec.c:61
idctdsp.h
avcodec.h
av_cmp_q
static int av_cmp_q(AVRational a, AVRational b)
Compare two rationals.
Definition: rational.h:89
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:739
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
ff_mpeg12_frame_rate_tab
const AVRational ff_mpeg12_frame_rate_tab[]
Definition: mpeg12framerate.c:24
ret
ret
Definition: filter_design.txt:187
pred
static const float pred[4]
Definition: siprdata.h:259
AV_FRAME_DATA_GOP_TIMECODE
@ AV_FRAME_DATA_GOP_TIMECODE
The GOP timecode in 25 bit timecode format.
Definition: frame.h:124
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
ff_mpeg1_default_non_intra_matrix
const uint16_t ff_mpeg1_default_non_intra_matrix[64]
Definition: mpeg12data.c:41
AVCPBProperties::buffer_size
int64_t buffer_size
The size of the buffer to which the ratecontrol is applied, in bits.
Definition: defs.h:125
mpeg1_fast_decode_block_inter
static int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
Changing this would eat up any speed benefits it has.
Definition: mpeg12dec.c:229
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:694
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:1181
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dvdec.c:132
ff_thread_finish_setup
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call ff_thread_finish_setup() afterwards. If some code can 't be moved
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
mpeg_get_pixelformat
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
Definition: mpeg12dec.c:1163
AV_CODEC_FLAG2_CHUNKS
#define AV_CODEC_FLAG2_CHUNKS
Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
Definition: avcodec.h:302
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
mpeg12data.h
mpeg2_fast_decode_block_non_intra
static int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
Changing this would eat up any speed benefits it has.
Definition: mpeg12dec.c:404
mpeg_field_start
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:1591
skip_1stop_8data_bits
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:855
AVCodecContext
main external API structure.
Definition: avcodec.h:379
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1455
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:165
MpegEncContext::intra_dc_precision
int intra_dc_precision
Definition: mpegvideo.h:466
decode_dc
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12.h:40
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:1487
ff_update_duplicate_context
int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src)
Definition: mpegvideo.c:499
mpeg_decode_picture_coding_extension
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1532
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:212
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
AVCHROMA_LOC_CENTER
@ AVCHROMA_LOC_CENTER
MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0.
Definition: pixfmt.h:598
AVRational::den
int den
Denominator.
Definition: rational.h:60
error_resilience.h
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AVCodecContext::profile
int profile
profile
Definition: avcodec.h:1521
AVFrame::metadata
AVDictionary * metadata
metadata.
Definition: frame.h:572
ff_mb_btype_vlc
VLC ff_mb_btype_vlc
Definition: mpeg12.c:133
sign_extend
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
ff_thread_get_format
FF_DISABLE_DEPRECATION_WARNINGS enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Wrapper around get_format() for frame-multithreaded codecs.
Definition: pthread_frame.c:1061
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
ff_mpv_reconstruct_mb
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2248
Mpeg1Context::slice_count
int slice_count
Definition: mpeg12dec.c:66
profiles
static const AVProfile profiles[]
Definition: libfdk-aacenc.c:429
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:77
FF_CODEC_PROPERTY_CLOSED_CAPTIONS
#define FF_CODEC_PROPERTY_CLOSED_CAPTIONS
Definition: avcodec.h:1820
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
av_buffer_realloc
int av_buffer_realloc(AVBufferRef **pbuf, size_t size)
Reallocate a given buffer.
Definition: buffer.c:169
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:1298
AV_EF_AGGRESSIVE
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:1336
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:2095
shift
static int shift(int a, int b)
Definition: sonic.c:83
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:567
get_dmv
static int get_dmv(MpegEncContext *s)
Definition: mpeg12dec.c:638
tc
#define tc
Definition: regdef.h:69
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mpeg_decode_end
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
Definition: mpeg12dec.c:2873
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
ff_mpeg2video_decoder
const AVCodec ff_mpeg2video_decoder
Definition: mpeg12dec.c:2917
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:86
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
MpegEncContext::inter_scantable
ScanTable inter_scantable
if inter == intra then intra should be used to reduce the cache usage
Definition: mpegvideo.h:90
IDCTDSPContext::idct_permutation
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
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
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:209
check_marker
static int check_marker(void *logctx, GetBitContext *s, const char *msg)
Definition: get_bits.h:613
ER_MV_END
#define ER_MV_END
Definition: error_resilience.h:36
diff
static av_always_inline int diff(const uint32_t a, const uint32_t b)
Definition: vf_palettegen.c:136
ff_mv_vlc
VLC ff_mv_vlc
Definition: mpeg12.c:126
MpegEncContext::q_scale_type
int q_scale_type
Definition: mpegvideo.h:470
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:404
Mpeg1Context::mpeg_enc_ctx
MpegEncContext mpeg_enc_ctx
Definition: mpeg12dec.c:57
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:406
ScanTable::permutated
uint8_t permutated[64]
Definition: idctdsp.h:33
ff_er_frame_end
void ff_er_frame_end(ERContext *s)
Definition: error_resilience.c:899
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
mpeg_decode_sequence_extension
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1387
HWACCEL_VAAPI
#define HWACCEL_VAAPI(codec)
Definition: hwconfig.h:73
mpeg_er.h
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:552
int32_t
int32_t
Definition: audioconvert.c:56
bytestream.h
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AV_CODEC_CAP_DRAW_HORIZ_BAND
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: codec.h:44
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
Mpeg1Context::frame_rate_ext
AVRational frame_rate_ext
Definition: mpeg12dec.c:70
mpeg_decode_motion
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
Definition: mpeg12dec.c:104
ff_mpv_report_decode_progress
void ff_mpv_report_decode_progress(MpegEncContext *s)
Definition: mpegvideo.c:2345
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
IPUContext::block
int16_t block[6][64]
Definition: mpeg12dec.c:2984
mpeg_decode_user_data
static void mpeg_decode_user_data(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2362
h
h
Definition: vp9dsp_template.c:2038
MpegEncContext::end_mb_y
int end_mb_y
end mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
Definition: mpegvideo.h:154
ER_AC_END
#define ER_AC_END
Definition: error_resilience.h:34
AVStereo3D
Stereo 3D type: this structure describes how two videos are packed within a single video surface,...
Definition: stereo3d.h:176
av_image_check_sar
int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
Check if the given sample aspect ratio of an image is valid.
Definition: imgutils.c:323
MV_VLC_BITS
#define MV_VLC_BITS
Definition: mpeg12vlc.h:34
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:153
ff_mpv_decode_init
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Initialize the given MpegEncContext for decoding.
Definition: mpegvideo.c:699
AVDISCARD_NONREF
@ AVDISCARD_NONREF
discard all non reference
Definition: defs.h:50
MpegEncContext::alternate_scan
int alternate_scan
Definition: mpegvideo.h:473
DECODE_SLICE_OK
#define DECODE_SLICE_OK
Definition: mpeg12dec.c:1695
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:52
DECODE_SLICE_ERROR
#define DECODE_SLICE_ERROR
Definition: mpeg12dec.c:1694
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:81
load_matrix
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
Definition: mpeg12dec.c:1495
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
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:749
Mpeg1Context::afd
uint8_t afd
Definition: mpeg12dec.c:64
Mpeg1Context
Definition: mpeg12dec.c:56
RLTable::rl_vlc
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
MpegEncContext::chroma_intra_matrix
uint16_t chroma_intra_matrix[64]
Definition: mpegvideo.h:301
Mpeg1Context::extradata_decoded
int extradata_decoded
Definition: mpeg12dec.c:74
video_enc_params.h
mpeg2_decode_block_non_intra
static int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:314
MB_TYPE_INTRA
#define MB_TYPE_INTRA
Definition: mpegutils.h:72
MBINCR_VLC_BITS
#define MBINCR_VLC_BITS
Definition: mpeg12vlc.h:37
mpeg_decode_slice
static int mpeg_decode_slice(MpegEncContext *s, int mb_y, const uint8_t **buf, int buf_size)
Decode a slice.
Definition: mpeg12dec.c:1703
re
float re
Definition: fft.c:82