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;
1344 
1345  init_get_bits(&s->gb, buf, buf_size * 8);
1346 
1347  ref = get_bits(&s->gb, 10); /* temporal ref */
1348  s->pict_type = get_bits(&s->gb, 3);
1349  if (s->pict_type == 0 || s->pict_type > 3)
1350  return AVERROR_INVALIDDATA;
1351 
1352  vbv_delay = get_bits(&s->gb, 16);
1353  s->vbv_delay = vbv_delay;
1354  if (s->pict_type == AV_PICTURE_TYPE_P ||
1355  s->pict_type == AV_PICTURE_TYPE_B) {
1356  s->full_pel[0] = get_bits1(&s->gb);
1357  f_code = get_bits(&s->gb, 3);
1358  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1359  return AVERROR_INVALIDDATA;
1360  f_code += !f_code;
1361  s->mpeg_f_code[0][0] = f_code;
1362  s->mpeg_f_code[0][1] = f_code;
1363  }
1364  if (s->pict_type == AV_PICTURE_TYPE_B) {
1365  s->full_pel[1] = get_bits1(&s->gb);
1366  f_code = get_bits(&s->gb, 3);
1367  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1368  return AVERROR_INVALIDDATA;
1369  f_code += !f_code;
1370  s->mpeg_f_code[1][0] = f_code;
1371  s->mpeg_f_code[1][1] = f_code;
1372  }
1373  s->current_picture.f->pict_type = s->pict_type;
1374  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1375 
1376  if (avctx->debug & FF_DEBUG_PICT_INFO)
1377  av_log(avctx, AV_LOG_DEBUG,
1378  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1379 
1380  s->y_dc_scale = 8;
1381  s->c_dc_scale = 8;
1382  return 0;
1383 }
1384 
1386 {
1387  MpegEncContext *s = &s1->mpeg_enc_ctx;
1388  int horiz_size_ext, vert_size_ext;
1389  int bit_rate_ext;
1390  AVCPBProperties *cpb_props;
1391 
1392  skip_bits(&s->gb, 1); /* profile and level esc*/
1393  s->avctx->profile = get_bits(&s->gb, 3);
1394  s->avctx->level = get_bits(&s->gb, 4);
1395  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1396  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1397 
1398  if (!s->chroma_format) {
1399  s->chroma_format = 1;
1400  av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1401  }
1402 
1403  horiz_size_ext = get_bits(&s->gb, 2);
1404  vert_size_ext = get_bits(&s->gb, 2);
1405  s->width |= (horiz_size_ext << 12);
1406  s->height |= (vert_size_ext << 12);
1407  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1408  s->bit_rate += (bit_rate_ext << 18) * 400LL;
1409  check_marker(s->avctx, &s->gb, "after bit rate extension");
1410  s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1411 
1412  s->low_delay = get_bits1(&s->gb);
1413  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1414  s->low_delay = 1;
1415 
1416  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1417  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1418 
1419  ff_dlog(s->avctx, "sequence extension\n");
1420  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1421 
1422  if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1423  cpb_props->buffer_size = s1->rc_buffer_size;
1424  if (s->bit_rate != 0x3FFFF*400)
1425  cpb_props->max_bitrate = s->bit_rate;
1426  }
1427 
1428  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1429  av_log(s->avctx, AV_LOG_DEBUG,
1430  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1431  s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1432  s1->rc_buffer_size, s->bit_rate);
1433 }
1434 
1436 {
1437  MpegEncContext *s = &s1->mpeg_enc_ctx;
1438  int color_description, w, h;
1439 
1440  skip_bits(&s->gb, 3); /* video format */
1441  color_description = get_bits1(&s->gb);
1442  if (color_description) {
1443  s->avctx->color_primaries = get_bits(&s->gb, 8);
1444  s->avctx->color_trc = get_bits(&s->gb, 8);
1445  s->avctx->colorspace = get_bits(&s->gb, 8);
1446  }
1447  w = get_bits(&s->gb, 14);
1448  skip_bits(&s->gb, 1); // marker
1449  h = get_bits(&s->gb, 14);
1450  // remaining 3 bits are zero padding
1451 
1452  s1->pan_scan.width = 16 * w;
1453  s1->pan_scan.height = 16 * h;
1454 
1455  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1456  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1457 }
1458 
1460 {
1461  MpegEncContext *s = &s1->mpeg_enc_ctx;
1462  int i, nofco;
1463 
1464  nofco = 1;
1465  if (s->progressive_sequence) {
1466  if (s->repeat_first_field) {
1467  nofco++;
1468  if (s->top_field_first)
1469  nofco++;
1470  }
1471  } else {
1472  if (s->picture_structure == PICT_FRAME) {
1473  nofco++;
1474  if (s->repeat_first_field)
1475  nofco++;
1476  }
1477  }
1478  for (i = 0; i < nofco; i++) {
1479  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1480  skip_bits(&s->gb, 1); // marker
1481  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1482  skip_bits(&s->gb, 1); // marker
1483  }
1484 
1485  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1486  av_log(s->avctx, AV_LOG_DEBUG,
1487  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1488  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1489  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1490  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1491 }
1492 
1493 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1494  uint16_t matrix1[64], int intra)
1495 {
1496  int i;
1497 
1498  for (i = 0; i < 64; i++) {
1499  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1500  int v = get_bits(&s->gb, 8);
1501  if (v == 0) {
1502  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1503  return AVERROR_INVALIDDATA;
1504  }
1505  if (intra && i == 0 && v != 8) {
1506  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1507  v = 8; // needed by pink.mpg / issue1046
1508  }
1509  matrix0[j] = v;
1510  if (matrix1)
1511  matrix1[j] = v;
1512  }
1513  return 0;
1514 }
1515 
1517 {
1518  ff_dlog(s->avctx, "matrix extension\n");
1519 
1520  if (get_bits1(&s->gb))
1521  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1522  if (get_bits1(&s->gb))
1523  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1524  if (get_bits1(&s->gb))
1525  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1526  if (get_bits1(&s->gb))
1527  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1528 }
1529 
1531 {
1532  MpegEncContext *s = &s1->mpeg_enc_ctx;
1533 
1534  s->full_pel[0] = s->full_pel[1] = 0;
1535  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1536  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1537  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1538  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1539  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1540  av_log(s->avctx, AV_LOG_ERROR,
1541  "Missing picture start code, guessing missing values\n");
1542  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1543  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1544  s->pict_type = AV_PICTURE_TYPE_I;
1545  else
1546  s->pict_type = AV_PICTURE_TYPE_P;
1547  } else
1548  s->pict_type = AV_PICTURE_TYPE_B;
1549  s->current_picture.f->pict_type = s->pict_type;
1550  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1551  }
1552  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1553  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1554  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1555  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1556 
1557  s->intra_dc_precision = get_bits(&s->gb, 2);
1558  s->picture_structure = get_bits(&s->gb, 2);
1559  s->top_field_first = get_bits1(&s->gb);
1560  s->frame_pred_frame_dct = get_bits1(&s->gb);
1561  s->concealment_motion_vectors = get_bits1(&s->gb);
1562  s->q_scale_type = get_bits1(&s->gb);
1563  s->intra_vlc_format = get_bits1(&s->gb);
1564  s->alternate_scan = get_bits1(&s->gb);
1565  s->repeat_first_field = get_bits1(&s->gb);
1566  s->chroma_420_type = get_bits1(&s->gb);
1567  s->progressive_frame = get_bits1(&s->gb);
1568 
1569  if (s->alternate_scan) {
1570  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1571  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1572  } else {
1573  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1574  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1575  }
1576 
1577  /* composite display not parsed */
1578  ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1579  ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1580  ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1581  ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1582  ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1583  ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1584  ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1585  ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1586  ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1587 }
1588 
1589 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1590 {
1591  AVCodecContext *avctx = s->avctx;
1592  Mpeg1Context *s1 = (Mpeg1Context *) s;
1593  int ret;
1594 
1595  if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1596  if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1597  return AVERROR_INVALIDDATA;
1598  }
1599 
1600  /* start frame decoding */
1601  if (s->first_field || s->picture_structure == PICT_FRAME) {
1602  AVFrameSideData *pan_scan;
1603 
1604  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1605  return ret;
1606 
1608 
1609  /* first check if we must repeat the frame */
1610  s->current_picture_ptr->f->repeat_pict = 0;
1611  if (s->repeat_first_field) {
1612  if (s->progressive_sequence) {
1613  if (s->top_field_first)
1614  s->current_picture_ptr->f->repeat_pict = 4;
1615  else
1616  s->current_picture_ptr->f->repeat_pict = 2;
1617  } else if (s->progressive_frame) {
1618  s->current_picture_ptr->f->repeat_pict = 1;
1619  }
1620  }
1621 
1622  pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1624  sizeof(s1->pan_scan));
1625  if (!pan_scan)
1626  return AVERROR(ENOMEM);
1627  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1628 
1629  if (s1->a53_buf_ref) {
1631  s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1632  s1->a53_buf_ref);
1633  if (!sd)
1634  av_buffer_unref(&s1->a53_buf_ref);
1635  s1->a53_buf_ref = NULL;
1636  }
1637 
1638  if (s1->has_stereo3d) {
1639  AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1640  if (!stereo)
1641  return AVERROR(ENOMEM);
1642 
1643  *stereo = s1->stereo3d;
1644  s1->has_stereo3d = 0;
1645  }
1646 
1647  if (s1->has_afd) {
1648  AVFrameSideData *sd =
1649  av_frame_new_side_data(s->current_picture_ptr->f,
1650  AV_FRAME_DATA_AFD, 1);
1651  if (!sd)
1652  return AVERROR(ENOMEM);
1653 
1654  *sd->data = s1->afd;
1655  s1->has_afd = 0;
1656  }
1657 
1658  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1659  ff_thread_finish_setup(avctx);
1660  } else { // second field
1661  int i;
1662 
1663  if (!s->current_picture_ptr) {
1664  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1665  return AVERROR_INVALIDDATA;
1666  }
1667 
1668  if (s->avctx->hwaccel) {
1669  if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1670  av_log(avctx, AV_LOG_ERROR,
1671  "hardware accelerator failed to decode first field\n");
1672  return ret;
1673  }
1674  }
1675 
1676  for (i = 0; i < 4; i++) {
1677  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1678  if (s->picture_structure == PICT_BOTTOM_FIELD)
1679  s->current_picture.f->data[i] +=
1680  s->current_picture_ptr->f->linesize[i];
1681  }
1682  }
1683 
1684  if (avctx->hwaccel) {
1685  if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1686  return ret;
1687  }
1688 
1689  return 0;
1690 }
1691 
1692 #define DECODE_SLICE_ERROR -1
1693 #define DECODE_SLICE_OK 0
1694 
1695 /**
1696  * Decode a slice.
1697  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1698  * @return DECODE_SLICE_ERROR if the slice is damaged,
1699  * DECODE_SLICE_OK if this slice is OK
1700  */
1701 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1702  const uint8_t **buf, int buf_size)
1703 {
1704  AVCodecContext *avctx = s->avctx;
1705  const int lowres = s->avctx->lowres;
1706  const int field_pic = s->picture_structure != PICT_FRAME;
1707  int ret;
1708 
1709  s->resync_mb_x =
1710  s->resync_mb_y = -1;
1711 
1712  av_assert0(mb_y < s->mb_height);
1713 
1714  init_get_bits(&s->gb, *buf, buf_size * 8);
1715  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1716  skip_bits(&s->gb, 3);
1717 
1719  s->interlaced_dct = 0;
1720 
1721  s->qscale = mpeg_get_qscale(s);
1722 
1723  if (s->qscale == 0) {
1724  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1725  return AVERROR_INVALIDDATA;
1726  }
1727 
1728  /* extra slice info */
1729  if (skip_1stop_8data_bits(&s->gb) < 0)
1730  return AVERROR_INVALIDDATA;
1731 
1732  s->mb_x = 0;
1733 
1734  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1735  skip_bits1(&s->gb);
1736  } else {
1737  while (get_bits_left(&s->gb) > 0) {
1738  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1739  MBINCR_VLC_BITS, 2);
1740  if (code < 0) {
1741  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1742  return AVERROR_INVALIDDATA;
1743  }
1744  if (code >= 33) {
1745  if (code == 33)
1746  s->mb_x += 33;
1747  /* otherwise, stuffing, nothing to do */
1748  } else {
1749  s->mb_x += code;
1750  break;
1751  }
1752  }
1753  }
1754 
1755  if (s->mb_x >= (unsigned) s->mb_width) {
1756  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1757  return AVERROR_INVALIDDATA;
1758  }
1759 
1760  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1761  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1762  int start_code = -1;
1763  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1764  if (buf_end < *buf + buf_size)
1765  buf_end -= 4;
1766  s->mb_y = mb_y;
1767  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1768  return DECODE_SLICE_ERROR;
1769  *buf = buf_end;
1770  return DECODE_SLICE_OK;
1771  }
1772 
1773  s->resync_mb_x = s->mb_x;
1774  s->resync_mb_y = s->mb_y = mb_y;
1775  s->mb_skip_run = 0;
1777 
1778  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1779  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1780  av_log(s->avctx, AV_LOG_DEBUG,
1781  "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1782  s->qscale,
1783  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1784  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1785  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1786  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1787  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1788  s->progressive_sequence ? "ps" : "",
1789  s->progressive_frame ? "pf" : "",
1790  s->alternate_scan ? "alt" : "",
1791  s->top_field_first ? "top" : "",
1792  s->intra_dc_precision, s->picture_structure,
1793  s->frame_pred_frame_dct, s->concealment_motion_vectors,
1794  s->q_scale_type, s->intra_vlc_format,
1795  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1796  }
1797  }
1798 
1799  for (;;) {
1800  // If 1, we memcpy blocks in xvmcvideo.
1801  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1802  ff_xvmc_init_block(s); // set s->block
1803 
1804  if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1805  return ret;
1806 
1807  // Note motion_val is normally NULL unless we want to extract the MVs.
1808  if (s->current_picture.motion_val[0] && !s->encoding) {
1809  const int wrap = s->b8_stride;
1810  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1811  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1812  int motion_x, motion_y, dir, i;
1813 
1814  for (i = 0; i < 2; i++) {
1815  for (dir = 0; dir < 2; dir++) {
1816  if (s->mb_intra ||
1817  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1818  motion_x = motion_y = 0;
1819  } else if (s->mv_type == MV_TYPE_16X16 ||
1820  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1821  motion_x = s->mv[dir][0][0];
1822  motion_y = s->mv[dir][0][1];
1823  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1824  motion_x = s->mv[dir][i][0];
1825  motion_y = s->mv[dir][i][1];
1826  }
1827 
1828  s->current_picture.motion_val[dir][xy][0] = motion_x;
1829  s->current_picture.motion_val[dir][xy][1] = motion_y;
1830  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1831  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1832  s->current_picture.ref_index [dir][b8_xy] =
1833  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1834  av_assert2(s->field_select[dir][i] == 0 ||
1835  s->field_select[dir][i] == 1);
1836  }
1837  xy += wrap;
1838  b8_xy += 2;
1839  }
1840  }
1841 
1842  s->dest[0] += 16 >> lowres;
1843  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1844  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1845 
1846  ff_mpv_reconstruct_mb(s, s->block);
1847 
1848  if (++s->mb_x >= s->mb_width) {
1849  const int mb_size = 16 >> s->avctx->lowres;
1850  int left;
1851 
1852  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1854 
1855  s->mb_x = 0;
1856  s->mb_y += 1 << field_pic;
1857 
1858  if (s->mb_y >= s->mb_height) {
1859  int left = get_bits_left(&s->gb);
1860  int is_d10 = s->chroma_format == 2 &&
1861  s->pict_type == AV_PICTURE_TYPE_I &&
1862  avctx->profile == 0 && avctx->level == 5 &&
1863  s->intra_dc_precision == 2 &&
1864  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1865  s->progressive_frame == 0
1866  /* vbv_delay == 0xBBB || 0xE10 */;
1867 
1868  if (left >= 32 && !is_d10) {
1869  GetBitContext gb = s->gb;
1870  align_get_bits(&gb);
1871  if (show_bits(&gb, 24) == 0x060E2B) {
1872  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1873  is_d10 = 1;
1874  }
1875  if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1876  av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1877  goto eos;
1878  }
1879  }
1880 
1881  if (left < 0 ||
1882  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1883  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1884  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1885  left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1886  return AVERROR_INVALIDDATA;
1887  } else
1888  goto eos;
1889  }
1890  // There are some files out there which are missing the last slice
1891  // in cases where the slice is completely outside the visible
1892  // area, we detect this here instead of running into the end expecting
1893  // more data
1894  left = get_bits_left(&s->gb);
1895  if (s->mb_y >= ((s->height + 15) >> 4) &&
1896  !s->progressive_sequence &&
1897  left <= 25 &&
1898  left >= 0 &&
1899  s->mb_skip_run == -1 &&
1900  (!left || show_bits(&s->gb, left) == 0))
1901  goto eos;
1902 
1904  }
1905 
1906  /* skip mb handling */
1907  if (s->mb_skip_run == -1) {
1908  /* read increment again */
1909  s->mb_skip_run = 0;
1910  for (;;) {
1911  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1912  MBINCR_VLC_BITS, 2);
1913  if (code < 0) {
1914  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1915  return AVERROR_INVALIDDATA;
1916  }
1917  if (code >= 33) {
1918  if (code == 33) {
1919  s->mb_skip_run += 33;
1920  } else if (code == 35) {
1921  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1922  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1923  return AVERROR_INVALIDDATA;
1924  }
1925  goto eos; /* end of slice */
1926  }
1927  /* otherwise, stuffing, nothing to do */
1928  } else {
1929  s->mb_skip_run += code;
1930  break;
1931  }
1932  }
1933  if (s->mb_skip_run) {
1934  int i;
1935  if (s->pict_type == AV_PICTURE_TYPE_I) {
1936  av_log(s->avctx, AV_LOG_ERROR,
1937  "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1938  return AVERROR_INVALIDDATA;
1939  }
1940 
1941  /* skip mb */
1942  s->mb_intra = 0;
1943  for (i = 0; i < 12; i++)
1944  s->block_last_index[i] = -1;
1945  if (s->picture_structure == PICT_FRAME)
1946  s->mv_type = MV_TYPE_16X16;
1947  else
1948  s->mv_type = MV_TYPE_FIELD;
1949  if (s->pict_type == AV_PICTURE_TYPE_P) {
1950  /* if P type, zero motion vector is implied */
1951  s->mv_dir = MV_DIR_FORWARD;
1952  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1953  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1954  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1955  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1956  } else {
1957  /* if B type, reuse previous vectors and directions */
1958  s->mv[0][0][0] = s->last_mv[0][0][0];
1959  s->mv[0][0][1] = s->last_mv[0][0][1];
1960  s->mv[1][0][0] = s->last_mv[1][0][0];
1961  s->mv[1][0][1] = s->last_mv[1][0][1];
1962  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1963  s->field_select[1][0] = (s->picture_structure - 1) & 1;
1964  }
1965  }
1966  }
1967  }
1968 eos: // end of slice
1969  if (get_bits_left(&s->gb) < 0) {
1970  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1971  return AVERROR_INVALIDDATA;
1972  }
1973  *buf += (get_bits_count(&s->gb) - 1) / 8;
1974  ff_dlog(s, "Slice start:%d %d end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1975  return 0;
1976 }
1977 
1979 {
1980  MpegEncContext *s = *(void **) arg;
1981  const uint8_t *buf = s->gb.buffer;
1982  int mb_y = s->start_mb_y;
1983  const int field_pic = s->picture_structure != PICT_FRAME;
1984 
1985  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1986 
1987  for (;;) {
1988  uint32_t start_code;
1989  int ret;
1990 
1991  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1992  emms_c();
1993  ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1994  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1995  s->start_mb_y, s->end_mb_y, s->er.error_count);
1996  if (ret < 0) {
1997  if (c->err_recognition & AV_EF_EXPLODE)
1998  return ret;
1999  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2000  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2001  s->mb_x, s->mb_y,
2003  } else {
2004  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2005  s->mb_x - 1, s->mb_y,
2007  }
2008 
2009  if (s->mb_y == s->end_mb_y)
2010  return 0;
2011 
2012  start_code = -1;
2013  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2014  if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2015  return AVERROR_INVALIDDATA;
2017  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2018  mb_y += (*buf&0xE0)<<2;
2019  mb_y <<= field_pic;
2020  if (s->picture_structure == PICT_BOTTOM_FIELD)
2021  mb_y++;
2022  if (mb_y >= s->end_mb_y)
2023  return AVERROR_INVALIDDATA;
2024  }
2025 }
2026 
2027 /**
2028  * Handle slice ends.
2029  * @return 1 if it seems to be the last slice
2030  */
2031 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2032 {
2033  Mpeg1Context *s1 = avctx->priv_data;
2034  MpegEncContext *s = &s1->mpeg_enc_ctx;
2035 
2036  if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2037  return 0;
2038 
2039  if (s->avctx->hwaccel) {
2040  int ret = s->avctx->hwaccel->end_frame(s->avctx);
2041  if (ret < 0) {
2042  av_log(avctx, AV_LOG_ERROR,
2043  "hardware accelerator failed to decode picture\n");
2044  return ret;
2045  }
2046  }
2047 
2048  /* end of slice reached */
2049  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2050  /* end of image */
2051 
2052  ff_er_frame_end(&s->er);
2053 
2055 
2056  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2057  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2058  if (ret < 0)
2059  return ret;
2060  ff_print_debug_info(s, s->current_picture_ptr, pict);
2061  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2062  } else {
2063  if (avctx->active_thread_type & FF_THREAD_FRAME)
2064  s->picture_number++;
2065  /* latency of 1 frame for I- and P-frames */
2066  /* XXX: use another variable than picture_number */
2067  if (s->last_picture_ptr) {
2068  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2069  if (ret < 0)
2070  return ret;
2071  ff_print_debug_info(s, s->last_picture_ptr, pict);
2072  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2073  }
2074  }
2075 
2076  return 1;
2077  } else {
2078  return 0;
2079  }
2080 }
2081 
2083  const uint8_t *buf, int buf_size)
2084 {
2085  Mpeg1Context *s1 = avctx->priv_data;
2086  MpegEncContext *s = &s1->mpeg_enc_ctx;
2087  int width, height;
2088  int i, v, j;
2089 
2090  init_get_bits(&s->gb, buf, buf_size * 8);
2091 
2092  width = get_bits(&s->gb, 12);
2093  height = get_bits(&s->gb, 12);
2094  if (width == 0 || height == 0) {
2095  av_log(avctx, AV_LOG_WARNING,
2096  "Invalid horizontal or vertical size value.\n");
2098  return AVERROR_INVALIDDATA;
2099  }
2100  s->aspect_ratio_info = get_bits(&s->gb, 4);
2101  if (s->aspect_ratio_info == 0) {
2102  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2104  return AVERROR_INVALIDDATA;
2105  }
2106  s->frame_rate_index = get_bits(&s->gb, 4);
2107  if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2108  av_log(avctx, AV_LOG_WARNING,
2109  "frame_rate_index %d is invalid\n", s->frame_rate_index);
2110  s->frame_rate_index = 1;
2111  }
2112  s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2113  if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2114  return AVERROR_INVALIDDATA;
2115  }
2116 
2117  s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2118  skip_bits(&s->gb, 1);
2119 
2120  /* get matrix */
2121  if (get_bits1(&s->gb)) {
2122  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2123  } else {
2124  for (i = 0; i < 64; i++) {
2125  j = s->idsp.idct_permutation[i];
2127  s->intra_matrix[j] = v;
2128  s->chroma_intra_matrix[j] = v;
2129  }
2130  }
2131  if (get_bits1(&s->gb)) {
2132  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2133  } else {
2134  for (i = 0; i < 64; i++) {
2135  int j = s->idsp.idct_permutation[i];
2137  s->inter_matrix[j] = v;
2138  s->chroma_inter_matrix[j] = v;
2139  }
2140  }
2141 
2142  if (show_bits(&s->gb, 23) != 0) {
2143  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2144  return AVERROR_INVALIDDATA;
2145  }
2146 
2147  s->width = width;
2148  s->height = height;
2149 
2150  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2151  s->progressive_sequence = 1;
2152  s->progressive_frame = 1;
2153  s->picture_structure = PICT_FRAME;
2154  s->first_field = 0;
2155  s->frame_pred_frame_dct = 1;
2156  s->chroma_format = 1;
2157  s->codec_id =
2158  s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2159  s->out_format = FMT_MPEG1;
2160  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2161  if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2162  s->low_delay = 1;
2163 
2164  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2165  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2166  s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2167 
2168  return 0;
2169 }
2170 
2172 {
2173  Mpeg1Context *s1 = avctx->priv_data;
2174  MpegEncContext *s = &s1->mpeg_enc_ctx;
2175  int i, v, ret;
2176 
2177  /* start new MPEG-1 context decoding */
2178  s->out_format = FMT_MPEG1;
2179  if (s1->mpeg_enc_ctx_allocated) {
2181  s1->mpeg_enc_ctx_allocated = 0;
2182  }
2183  s->width = avctx->coded_width;
2184  s->height = avctx->coded_height;
2185  avctx->has_b_frames = 0; // true?
2186  s->low_delay = 1;
2187 
2188  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2189  setup_hwaccel_for_pixfmt(avctx);
2190 
2192  if ((ret = ff_mpv_common_init(s)) < 0)
2193  return ret;
2194  s1->mpeg_enc_ctx_allocated = 1;
2195 
2196  for (i = 0; i < 64; i++) {
2197  int j = s->idsp.idct_permutation[i];
2199  s->intra_matrix[j] = v;
2200  s->chroma_intra_matrix[j] = v;
2201 
2203  s->inter_matrix[j] = v;
2204  s->chroma_inter_matrix[j] = v;
2205  }
2206 
2207  s->progressive_sequence = 1;
2208  s->progressive_frame = 1;
2209  s->picture_structure = PICT_FRAME;
2210  s->first_field = 0;
2211  s->frame_pred_frame_dct = 1;
2212  s->chroma_format = 1;
2213  if (s->codec_tag == AV_RL32("BW10")) {
2214  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2215  } else {
2216  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2217  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2218  }
2219  s1->save_width = s->width;
2220  s1->save_height = s->height;
2221  s1->save_progressive_seq = s->progressive_sequence;
2222  return 0;
2223 }
2224 
2226  const uint8_t *p, int buf_size)
2227 {
2228  Mpeg1Context *s1 = avctx->priv_data;
2229 
2230  if (buf_size >= 6 &&
2231  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2232  p[4] == 3 && (p[5] & 0x40)) {
2233  /* extract A53 Part 4 CC data */
2234  int cc_count = p[5] & 0x1f;
2235  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2236  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2237  const uint64_t new_size = (old_size + cc_count
2238  * UINT64_C(3));
2239  int ret;
2240 
2241  if (new_size > 3*A53_MAX_CC_COUNT)
2242  return AVERROR(EINVAL);
2243 
2244  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2245  if (ret >= 0)
2246  memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
2247 
2249  }
2250  return 1;
2251  } else if (buf_size >= 2 &&
2252  p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2253  /* extract SCTE-20 CC data */
2254  GetBitContext gb;
2255  int cc_count = 0;
2256  int i, ret;
2257 
2258  init_get_bits(&gb, p + 2, buf_size - 2);
2259  cc_count = get_bits(&gb, 5);
2260  if (cc_count > 0) {
2261  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2262  const uint64_t new_size = (old_size + cc_count
2263  * UINT64_C(3));
2264  if (new_size > 3*A53_MAX_CC_COUNT)
2265  return AVERROR(EINVAL);
2266 
2267  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2268  if (ret >= 0) {
2269  uint8_t field, cc1, cc2;
2270  uint8_t *cap = s1->a53_buf_ref->data;
2271 
2272  memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
2273  for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2274  skip_bits(&gb, 2); // priority
2275  field = get_bits(&gb, 2);
2276  skip_bits(&gb, 5); // line_offset
2277  cc1 = get_bits(&gb, 8);
2278  cc2 = get_bits(&gb, 8);
2279  skip_bits(&gb, 1); // marker
2280 
2281  if (!field) { // forbidden
2282  cap[0] = cap[1] = cap[2] = 0x00;
2283  } else {
2284  field = (field == 2 ? 1 : 0);
2285  if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2286  cap[0] = 0x04 | field;
2287  cap[1] = ff_reverse[cc1];
2288  cap[2] = ff_reverse[cc2];
2289  }
2290  cap += 3;
2291  }
2292  }
2294  }
2295  return 1;
2296  } else if (buf_size >= 11 &&
2297  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2298  /* extract DVD CC data
2299  *
2300  * uint32_t user_data_start_code 0x000001B2 (big endian)
2301  * uint16_t user_identifier 0x4343 "CC"
2302  * uint8_t user_data_type_code 0x01
2303  * uint8_t caption_block_size 0xF8
2304  * uint8_t
2305  * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2306  * bit 6 caption_filler 0
2307  * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2308  * bit 0 caption_extra_field_added 1=one additional caption word
2309  *
2310  * struct caption_field_block {
2311  * uint8_t
2312  * bit 7:1 caption_filler 0x7F (all 1s)
2313  * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2314  * uint8_t caption_first_byte
2315  * uint8_t caption_second_byte
2316  * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2317  *
2318  * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2319  * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2320  * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2321  * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2322  * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2323  int cc_count = 0;
2324  int i, ret;
2325  // There is a caption count field in the data, but it is often
2326  // incorrect. So count the number of captions present.
2327  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2328  cc_count++;
2329  // Transform the DVD format into A53 Part 4 format
2330  if (cc_count > 0) {
2331  int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2332  const uint64_t new_size = (old_size + cc_count
2333  * UINT64_C(6));
2334  if (new_size > 3*A53_MAX_CC_COUNT)
2335  return AVERROR(EINVAL);
2336 
2337  ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2338  if (ret >= 0) {
2339  uint8_t field1 = !!(p[4] & 0x80);
2340  uint8_t *cap = s1->a53_buf_ref->data;
2341  p += 5;
2342  for (i = 0; i < cc_count; i++) {
2343  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2344  cap[1] = p[1];
2345  cap[2] = p[2];
2346  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2347  cap[4] = p[4];
2348  cap[5] = p[5];
2349  cap += 6;
2350  p += 6;
2351  }
2352  }
2354  }
2355  return 1;
2356  }
2357  return 0;
2358 }
2359 
2361  const uint8_t *p, int buf_size)
2362 {
2363  Mpeg1Context *s = avctx->priv_data;
2364  const uint8_t *buf_end = p + buf_size;
2365  Mpeg1Context *s1 = avctx->priv_data;
2366 
2367 #if 0
2368  int i;
2369  for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2370  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2371  }
2372  av_log(avctx, AV_LOG_ERROR, "\n");
2373 #endif
2374 
2375  if (buf_size > 29){
2376  int i;
2377  for(i=0; i<20; i++)
2378  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2379  s->tmpgexs= 1;
2380  }
2381  }
2382  /* we parse the DTG active format information */
2383  if (buf_end - p >= 5 &&
2384  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2385  int flags = p[4];
2386  p += 5;
2387  if (flags & 0x80) {
2388  /* skip event id */
2389  p += 2;
2390  }
2391  if (flags & 0x40) {
2392  if (buf_end - p < 1)
2393  return;
2394  s1->has_afd = 1;
2395  s1->afd = p[0] & 0x0f;
2396  }
2397  } else if (buf_end - p >= 6 &&
2398  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2399  p[4] == 0x03) { // S3D_video_format_length
2400  // the 0x7F mask ignores the reserved_bit value
2401  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2402 
2403  if (S3D_video_format_type == 0x03 ||
2404  S3D_video_format_type == 0x04 ||
2405  S3D_video_format_type == 0x08 ||
2406  S3D_video_format_type == 0x23) {
2407 
2408  s1->has_stereo3d = 1;
2409 
2410  switch (S3D_video_format_type) {
2411  case 0x03:
2412  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2413  break;
2414  case 0x04:
2415  s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2416  break;
2417  case 0x08:
2418  s1->stereo3d.type = AV_STEREO3D_2D;
2419  break;
2420  case 0x23:
2421  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2422  break;
2423  }
2424  }
2425  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2426  return;
2427  }
2428 }
2429 
2430 static void mpeg_decode_gop(AVCodecContext *avctx,
2431  const uint8_t *buf, int buf_size)
2432 {
2433  Mpeg1Context *s1 = avctx->priv_data;
2434  MpegEncContext *s = &s1->mpeg_enc_ctx;
2435  int broken_link;
2436  int64_t tc;
2437 
2438  init_get_bits(&s->gb, buf, buf_size * 8);
2439 
2440  tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2441 
2442  s->closed_gop = get_bits1(&s->gb);
2443  /* broken_link indicates that after editing the
2444  * reference frames of the first B-Frames after GOP I-Frame
2445  * are missing (open gop) */
2446  broken_link = get_bits1(&s->gb);
2447 
2448  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2449  char tcbuf[AV_TIMECODE_STR_SIZE];
2451  av_log(s->avctx, AV_LOG_DEBUG,
2452  "GOP (%s) closed_gop=%d broken_link=%d\n",
2453  tcbuf, s->closed_gop, broken_link);
2454  }
2455 }
2456 
2457 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2458  int *got_output, const uint8_t *buf, int buf_size)
2459 {
2460  Mpeg1Context *s = avctx->priv_data;
2461  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2462  const uint8_t *buf_ptr = buf;
2463  const uint8_t *buf_end = buf + buf_size;
2464  int ret, input_size;
2465  int last_code = 0, skip_frame = 0;
2466  int picture_start_code_seen = 0;
2467 
2468  for (;;) {
2469  /* find next start code */
2470  uint32_t start_code = -1;
2471  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2472  if (start_code > 0x1ff) {
2473  if (!skip_frame) {
2474  if (HAVE_THREADS &&
2475  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2476  !avctx->hwaccel) {
2477  int i;
2478  av_assert0(avctx->thread_count > 1);
2479 
2480  avctx->execute(avctx, slice_decode_thread,
2481  &s2->thread_context[0], NULL,
2482  s->slice_count, sizeof(void *));
2483  for (i = 0; i < s->slice_count; i++)
2484  s2->er.error_count += s2->thread_context[i]->er.error_count;
2485  }
2486 
2487  ret = slice_end(avctx, picture);
2488  if (ret < 0)
2489  return ret;
2490  else if (ret) {
2491  // FIXME: merge with the stuff in mpeg_decode_slice
2492  if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2493  *got_output = 1;
2494  }
2495  }
2496  s2->pict_type = 0;
2497 
2498  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2499  return AVERROR_INVALIDDATA;
2500 
2501  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2502  }
2503 
2504  input_size = buf_end - buf_ptr;
2505 
2506  if (avctx->debug & FF_DEBUG_STARTCODE)
2507  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2508  start_code, buf_ptr - buf, input_size);
2509 
2510  /* prepare data for next start code */
2511  switch (start_code) {
2512  case SEQ_START_CODE:
2513  if (last_code == 0) {
2514  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2515  if (buf != avctx->extradata)
2516  s->sync = 1;
2517  } else {
2518  av_log(avctx, AV_LOG_ERROR,
2519  "ignoring SEQ_START_CODE after %X\n", last_code);
2520  if (avctx->err_recognition & AV_EF_EXPLODE)
2521  return AVERROR_INVALIDDATA;
2522  }
2523  break;
2524 
2525  case PICTURE_START_CODE:
2526  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2527  /* If it's a frame picture, there can't be more than one picture header.
2528  Yet, it does happen and we need to handle it. */
2529  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2530  break;
2531  }
2532  picture_start_code_seen = 1;
2533 
2534  if (s2->width <= 0 || s2->height <= 0) {
2535  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2536  s2->width, s2->height);
2537  return AVERROR_INVALIDDATA;
2538  }
2539 
2540  if (s->tmpgexs){
2541  s2->intra_dc_precision= 3;
2542  s2->intra_matrix[0]= 1;
2543  }
2544  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2545  !avctx->hwaccel && s->slice_count) {
2546  int i;
2547 
2548  avctx->execute(avctx, slice_decode_thread,
2549  s2->thread_context, NULL,
2550  s->slice_count, sizeof(void *));
2551  for (i = 0; i < s->slice_count; i++)
2552  s2->er.error_count += s2->thread_context[i]->er.error_count;
2553  s->slice_count = 0;
2554  }
2555  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2556  ret = mpeg_decode_postinit(avctx);
2557  if (ret < 0) {
2558  av_log(avctx, AV_LOG_ERROR,
2559  "mpeg_decode_postinit() failure\n");
2560  return ret;
2561  }
2562 
2563  /* We have a complete image: we try to decompress it. */
2564  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2565  s2->pict_type = 0;
2566  s->first_slice = 1;
2567  last_code = PICTURE_START_CODE;
2568  } else {
2569  av_log(avctx, AV_LOG_ERROR,
2570  "ignoring pic after %X\n", last_code);
2571  if (avctx->err_recognition & AV_EF_EXPLODE)
2572  return AVERROR_INVALIDDATA;
2573  }
2574  break;
2575  case EXT_START_CODE:
2576  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2577 
2578  switch (get_bits(&s2->gb, 4)) {
2579  case 0x1:
2580  if (last_code == 0) {
2582  } else {
2583  av_log(avctx, AV_LOG_ERROR,
2584  "ignoring seq ext after %X\n", last_code);
2585  if (avctx->err_recognition & AV_EF_EXPLODE)
2586  return AVERROR_INVALIDDATA;
2587  }
2588  break;
2589  case 0x2:
2591  break;
2592  case 0x3:
2594  break;
2595  case 0x7:
2597  break;
2598  case 0x8:
2599  if (last_code == PICTURE_START_CODE) {
2601  } else {
2602  av_log(avctx, AV_LOG_ERROR,
2603  "ignoring pic cod ext after %X\n", last_code);
2604  if (avctx->err_recognition & AV_EF_EXPLODE)
2605  return AVERROR_INVALIDDATA;
2606  }
2607  break;
2608  }
2609  break;
2610  case USER_START_CODE:
2611  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2612  break;
2613  case GOP_START_CODE:
2614  if (last_code == 0) {
2615  s2->first_field = 0;
2616  mpeg_decode_gop(avctx, buf_ptr, input_size);
2617  s->sync = 1;
2618  } else {
2619  av_log(avctx, AV_LOG_ERROR,
2620  "ignoring GOP_START_CODE after %X\n", last_code);
2621  if (avctx->err_recognition & AV_EF_EXPLODE)
2622  return AVERROR_INVALIDDATA;
2623  }
2624  break;
2625  default:
2627  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2628  if (s2->progressive_sequence && !s2->progressive_frame) {
2629  s2->progressive_frame = 1;
2630  av_log(s2->avctx, AV_LOG_ERROR,
2631  "interlaced frame in progressive sequence, ignoring\n");
2632  }
2633 
2634  if (s2->picture_structure == 0 ||
2635  (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2636  av_log(s2->avctx, AV_LOG_ERROR,
2637  "picture_structure %d invalid, ignoring\n",
2638  s2->picture_structure);
2639  s2->picture_structure = PICT_FRAME;
2640  }
2641 
2642  if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2643  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2644 
2645  if (s2->picture_structure == PICT_FRAME) {
2646  s2->first_field = 0;
2647  s2->v_edge_pos = 16 * s2->mb_height;
2648  } else {
2649  s2->first_field ^= 1;
2650  s2->v_edge_pos = 8 * s2->mb_height;
2651  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2652  }
2653  }
2655  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2656  const int field_pic = s2->picture_structure != PICT_FRAME;
2657  int mb_y = start_code - SLICE_MIN_START_CODE;
2658  last_code = SLICE_MIN_START_CODE;
2659  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2660  mb_y += (*buf_ptr&0xE0)<<2;
2661 
2662  mb_y <<= field_pic;
2663  if (s2->picture_structure == PICT_BOTTOM_FIELD)
2664  mb_y++;
2665 
2666  if (buf_end - buf_ptr < 2) {
2667  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2668  return AVERROR_INVALIDDATA;
2669  }
2670 
2671  if (mb_y >= s2->mb_height) {
2672  av_log(s2->avctx, AV_LOG_ERROR,
2673  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2674  return AVERROR_INVALIDDATA;
2675  }
2676 
2677  if (!s2->last_picture_ptr) {
2678  /* Skip B-frames if we do not have reference frames and
2679  * GOP is not closed. */
2680  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2681  if (!s2->closed_gop) {
2682  skip_frame = 1;
2683  av_log(s2->avctx, AV_LOG_DEBUG,
2684  "Skipping B slice due to open GOP\n");
2685  break;
2686  }
2687  }
2688  }
2689  if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2690  s->sync = 1;
2691  if (!s2->next_picture_ptr) {
2692  /* Skip P-frames if we do not have a reference frame or
2693  * we have an invalid header. */
2694  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2695  skip_frame = 1;
2696  av_log(s2->avctx, AV_LOG_DEBUG,
2697  "Skipping P slice due to !sync\n");
2698  break;
2699  }
2700  }
2701  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2702  s2->pict_type == AV_PICTURE_TYPE_B) ||
2703  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2704  s2->pict_type != AV_PICTURE_TYPE_I) ||
2705  avctx->skip_frame >= AVDISCARD_ALL) {
2706  skip_frame = 1;
2707  break;
2708  }
2709 
2710  if (!s->mpeg_enc_ctx_allocated)
2711  break;
2712 
2713  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2714  if (mb_y < avctx->skip_top ||
2715  mb_y >= s2->mb_height - avctx->skip_bottom)
2716  break;
2717  }
2718 
2719  if (!s2->pict_type) {
2720  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2721  if (avctx->err_recognition & AV_EF_EXPLODE)
2722  return AVERROR_INVALIDDATA;
2723  break;
2724  }
2725 
2726  if (s->first_slice) {
2727  skip_frame = 0;
2728  s->first_slice = 0;
2729  if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2730  return ret;
2731  }
2732  if (!s2->current_picture_ptr) {
2733  av_log(avctx, AV_LOG_ERROR,
2734  "current_picture not initialized\n");
2735  return AVERROR_INVALIDDATA;
2736  }
2737 
2738  if (HAVE_THREADS &&
2739  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2740  !avctx->hwaccel) {
2741  int threshold = (s2->mb_height * s->slice_count +
2742  s2->slice_context_count / 2) /
2743  s2->slice_context_count;
2744  av_assert0(avctx->thread_count > 1);
2745  if (threshold <= mb_y) {
2746  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2747 
2748  thread_context->start_mb_y = mb_y;
2749  thread_context->end_mb_y = s2->mb_height;
2750  if (s->slice_count) {
2751  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2752  ret = ff_update_duplicate_context(thread_context, s2);
2753  if (ret < 0)
2754  return ret;
2755  }
2756  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2757  s->slice_count++;
2758  }
2759  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2760  } else {
2761  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2762  emms_c();
2763 
2764  if (ret < 0) {
2765  if (avctx->err_recognition & AV_EF_EXPLODE)
2766  return ret;
2767  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2768  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2769  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2771  } else {
2772  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2773  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2775  }
2776  }
2777  }
2778  break;
2779  }
2780  }
2781 }
2782 
2783 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2784  int *got_output, AVPacket *avpkt)
2785 {
2786  const uint8_t *buf = avpkt->data;
2787  int ret;
2788  int buf_size = avpkt->size;
2789  Mpeg1Context *s = avctx->priv_data;
2790  AVFrame *picture = data;
2791  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2792 
2793  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2794  /* special case for last picture */
2795  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2796  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2797  if (ret < 0)
2798  return ret;
2799 
2800  s2->next_picture_ptr = NULL;
2801 
2802  *got_output = 1;
2803  }
2804  return buf_size;
2805  }
2806 
2807  if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2808  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2809  buf_size, NULL);
2810 
2811  if (ff_combine_frame(&s2->parse_context, next,
2812  (const uint8_t **) &buf, &buf_size) < 0)
2813  return buf_size;
2814  }
2815 
2816  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2817  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2818  || s2->codec_tag == AV_RL32("BW10")
2819  ))
2820  vcr2_init_sequence(avctx);
2821 
2822  s->slice_count = 0;
2823 
2824  if (avctx->extradata && !s->extradata_decoded) {
2825  ret = decode_chunks(avctx, picture, got_output,
2826  avctx->extradata, avctx->extradata_size);
2827  if (*got_output) {
2828  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2829  av_frame_unref(picture);
2830  *got_output = 0;
2831  }
2832  s->extradata_decoded = 1;
2833  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2834  s2->current_picture_ptr = NULL;
2835  return ret;
2836  }
2837  }
2838 
2839  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2840  if (ret<0 || *got_output) {
2841  s2->current_picture_ptr = NULL;
2842 
2843  if (s2->timecode_frame_start != -1 && *got_output) {
2844  char tcbuf[AV_TIMECODE_STR_SIZE];
2845  AVFrameSideData *tcside = av_frame_new_side_data(picture,
2847  sizeof(int64_t));
2848  if (!tcside)
2849  return AVERROR(ENOMEM);
2850  memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2851 
2852  av_timecode_make_mpeg_tc_string(tcbuf, s2->timecode_frame_start);
2853  av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
2854 
2855  s2->timecode_frame_start = -1;
2856  }
2857  }
2858 
2859  return ret;
2860 }
2861 
2862 static void flush(AVCodecContext *avctx)
2863 {
2864  Mpeg1Context *s = avctx->priv_data;
2865 
2866  s->sync = 0;
2867 
2868  ff_mpeg_flush(avctx);
2869 }
2870 
2872 {
2873  Mpeg1Context *s = avctx->priv_data;
2874 
2875  if (s->mpeg_enc_ctx_allocated)
2876  ff_mpv_common_end(&s->mpeg_enc_ctx);
2877  av_buffer_unref(&s->a53_buf_ref);
2878  return 0;
2879 }
2880 
2882  .name = "mpeg1video",
2883  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2884  .type = AVMEDIA_TYPE_VIDEO,
2885  .id = AV_CODEC_ID_MPEG1VIDEO,
2886  .priv_data_size = sizeof(Mpeg1Context),
2888  .close = mpeg_decode_end,
2893  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
2895  .flush = flush,
2896  .max_lowres = 3,
2897  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2898  .hw_configs = (const AVCodecHWConfigInternal *const []) {
2899 #if CONFIG_MPEG1_NVDEC_HWACCEL
2900  HWACCEL_NVDEC(mpeg1),
2901 #endif
2902 #if CONFIG_MPEG1_VDPAU_HWACCEL
2903  HWACCEL_VDPAU(mpeg1),
2904 #endif
2905 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2906  HWACCEL_VIDEOTOOLBOX(mpeg1),
2907 #endif
2908 #if CONFIG_MPEG1_XVMC_HWACCEL
2909  HWACCEL_XVMC(mpeg1),
2910 #endif
2911  NULL
2912  },
2913 };
2914 
2916  .name = "mpeg2video",
2917  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2918  .type = AVMEDIA_TYPE_VIDEO,
2919  .id = AV_CODEC_ID_MPEG2VIDEO,
2920  .priv_data_size = sizeof(Mpeg1Context),
2922  .close = mpeg_decode_end,
2927  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
2929  .flush = flush,
2930  .max_lowres = 3,
2932  .hw_configs = (const AVCodecHWConfigInternal *const []) {
2933 #if CONFIG_MPEG2_DXVA2_HWACCEL
2934  HWACCEL_DXVA2(mpeg2),
2935 #endif
2936 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2937  HWACCEL_D3D11VA(mpeg2),
2938 #endif
2939 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2940  HWACCEL_D3D11VA2(mpeg2),
2941 #endif
2942 #if CONFIG_MPEG2_NVDEC_HWACCEL
2943  HWACCEL_NVDEC(mpeg2),
2944 #endif
2945 #if CONFIG_MPEG2_VAAPI_HWACCEL
2946  HWACCEL_VAAPI(mpeg2),
2947 #endif
2948 #if CONFIG_MPEG2_VDPAU_HWACCEL
2949  HWACCEL_VDPAU(mpeg2),
2950 #endif
2951 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2952  HWACCEL_VIDEOTOOLBOX(mpeg2),
2953 #endif
2954 #if CONFIG_MPEG2_XVMC_HWACCEL
2955  HWACCEL_XVMC(mpeg2),
2956 #endif
2957  NULL
2958  },
2959 };
2960 
2961 //legacy decoder
2963  .name = "mpegvideo",
2964  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2965  .type = AVMEDIA_TYPE_VIDEO,
2966  .id = AV_CODEC_ID_MPEG2VIDEO,
2967  .priv_data_size = sizeof(Mpeg1Context),
2969  .close = mpeg_decode_end,
2972  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
2974  .flush = flush,
2975  .max_lowres = 3,
2976 };
2977 
2978 typedef struct IPUContext {
2980 
2981  int flags;
2982  DECLARE_ALIGNED(32, int16_t, block)[6][64];
2983 } IPUContext;
2984 
2985 static int ipu_decode_frame(AVCodecContext *avctx, void *data,
2986  int *got_frame, AVPacket *avpkt)
2987 {
2988  IPUContext *s = avctx->priv_data;
2989  MpegEncContext *m = &s->m;
2990  GetBitContext *gb = &m->gb;
2991  AVFrame * const frame = data;
2992  int ret;
2993 
2994  ret = ff_get_buffer(avctx, frame, 0);
2995  if (ret < 0)
2996  return ret;
2997 
2998  ret = init_get_bits8(gb, avpkt->data, avpkt->size);
2999  if (ret < 0)
3000  return ret;
3001 
3002  s->flags = get_bits(gb, 8);
3003  m->intra_dc_precision = s->flags & 3;
3004  m->q_scale_type = !!(s->flags & 0x40);
3005  m->intra_vlc_format = !!(s->flags & 0x20);
3006  m->alternate_scan = !!(s->flags & 0x10);
3007 
3008  if (s->flags & 0x10) {
3011  } else {
3014  }
3015 
3016  m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3));
3017  m->qscale = 1;
3018 
3019  for (int y = 0; y < avctx->height; y += 16) {
3020  int intraquant;
3021 
3022  for (int x = 0; x < avctx->width; x += 16) {
3023  if (x || y) {
3024  if (!get_bits1(gb))
3025  return AVERROR_INVALIDDATA;
3026  }
3027  if (get_bits1(gb)) {
3028  intraquant = 0;
3029  } else {
3030  if (!get_bits1(gb))
3031  return AVERROR_INVALIDDATA;
3032  intraquant = 1;
3033  }
3034 
3035  if (s->flags & 4)
3036  skip_bits1(gb);
3037 
3038  if (intraquant)
3039  m->qscale = mpeg_get_qscale(m);
3040 
3041  memset(s->block, 0, sizeof(s->block));
3042 
3043  for (int n = 0; n < 6; n++) {
3044  if (s->flags & 0x80) {
3046  m->intra_matrix,
3048  m->last_dc, s->block[n],
3049  n, m->qscale);
3050  if (ret >= 0)
3051  m->block_last_index[n] = ret;
3052  } else {
3053  ret = mpeg2_decode_block_intra(m, s->block[n], n);
3054  }
3055 
3056  if (ret < 0)
3057  return ret;
3058  }
3059 
3060  m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
3061  frame->linesize[0], s->block[0]);
3062  m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
3063  frame->linesize[0], s->block[1]);
3064  m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
3065  frame->linesize[0], s->block[2]);
3066  m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
3067  frame->linesize[0], s->block[3]);
3068  m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
3069  frame->linesize[1], s->block[4]);
3070  m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
3071  frame->linesize[2], s->block[5]);
3072  }
3073  }
3074 
3075  align_get_bits(gb);
3076  if (get_bits_left(gb) != 32)
3077  return AVERROR_INVALIDDATA;
3078 
3079  frame->pict_type = AV_PICTURE_TYPE_I;
3080  frame->key_frame = 1;
3081  *got_frame = 1;
3082 
3083  return avpkt->size;
3084 }
3085 
3087 {
3088  IPUContext *s = avctx->priv_data;
3089  MpegEncContext *m = &s->m;
3090 
3091  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
3092 
3093  ff_mpv_decode_init(m, avctx);
3094  ff_mpv_idct_init(m);
3097 
3098  for (int i = 0; i < 64; i++) {
3099  int j = m->idsp.idct_permutation[i];
3101  m->intra_matrix[j] = v;
3102  m->chroma_intra_matrix[j] = v;
3103  }
3104 
3105  for (int i = 0; i < 64; i++) {
3106  int j = m->idsp.idct_permutation[i];
3108  m->inter_matrix[j] = v;
3109  m->chroma_inter_matrix[j] = v;
3110  }
3111 
3112  return 0;
3113 }
3114 
3116 {
3117  IPUContext *s = avctx->priv_data;
3118 
3119  ff_mpv_common_end(&s->m);
3120 
3121  return 0;
3122 }
3123 
3125  .name = "ipu",
3126  .long_name = NULL_IF_CONFIG_SMALL("IPU Video"),
3127  .type = AVMEDIA_TYPE_VIDEO,
3128  .id = AV_CODEC_ID_IPU,
3129  .priv_data_size = sizeof(IPUContext),
3130  .init = ipu_decode_init,
3132  .close = ipu_decode_end,
3133  .capabilities = AV_CODEC_CAP_DR1,
3135 };
PICT_FRAME
#define PICT_FRAME
Definition: mpegutils.h:39
vcr2_init_sequence
static int vcr2_init_sequence(AVCodecContext *avctx)
Definition: mpeg12dec.c:2171
ipu_decode_frame
static int ipu_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mpeg12dec.c:2985
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:1348
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:67
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:187
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:41
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:2225
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:850
FMT_MPEG1
@ FMT_MPEG1
Definition: mpegutils.h:124
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:2783
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:604
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:1313
SLICE_MAX_START_CODE
#define SLICE_MAX_START_CODE
Definition: cavs.h:34
MB_TYPE_16x8
#define MB_TYPE_16x8
Definition: mpegutils.h:55
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:3086
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:39
HWACCEL_DXVA2
#define HWACCEL_DXVA2(codec)
Definition: hwconfig.h:67
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
ipu_decode_end
static av_cold int ipu_decode_end(AVCodecContext *avctx)
Definition: mpeg12dec.c:3115
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:142
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: mpegutils.h:54
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:38
ff_er_add_slice
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
Definition: error_resilience.c:830
ff_init_block_index
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2267
ff_tlog
#define ff_tlog(ctx,...)
Definition: internal.h:91
mpegvideo.h
AV_EF_COMPLIANT
#define AV_EF_COMPLIANT
consider all spec non compliances as errors
Definition: avcodec.h:1328
MB_TYPE_L1
#define MB_TYPE_L1
Definition: mpegutils.h:68
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
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:1387
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:1292
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:1399
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:1699
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:2457
AVCodecContext::skip_frame
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:1662
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:1516
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:1429
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:99
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:1978
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:464
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:71
val
static double val(void *priv, double ch)
Definition: aeval.c:76
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:265
mpeg12_pixfmt_list_444
static enum AVPixelFormat mpeg12_pixfmt_list_444[]
Definition: mpeg12dec.c:1158
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:572
mpeg1_decode_sequence
static int mpeg1_decode_sequence(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: mpeg12dec.c:2082
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:101
AVRational::num
int num
Numerator.
Definition: rational.h:59
HWACCEL_VIDEOTOOLBOX
@ HWACCEL_VIDEOTOOLBOX
Definition: ffmpeg.h:62
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:61
AV_EF_BITSTREAM
#define AV_EF_BITSTREAM
detect bitstream specification deviations
Definition: avcodec.h:1322
IPUContext
Definition: mpeg12dec.c:2978
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:181
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:2862
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:486
AVCodecContext::has_b_frames
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:668
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:98
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:516
s1
#define s1
Definition: regdef.h:38
slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2031
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:1435
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:202
ctx
AVFormatContext * ctx
Definition: movenc.c:48
PICT_TOP_FIELD
#define PICT_TOP_FIELD
Definition: mpegutils.h:37
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:1183
ff_mpeg1video_decoder
const AVCodec ff_mpeg1video_decoder
Definition: mpeg12dec.c:2881
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:394
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:192
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:956
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:434
mpeg_decode_picture_display_extension
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
Definition: mpeg12dec.c:1459
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:288
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:257
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:70
lowres
static int lowres
Definition: ffplay.c:336
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:572
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:156
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:2962
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:1324
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:1640
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:471
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1638
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:248
AVPacket::size
int size
Definition: packet.h:366
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:117
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:326
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:2981
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
FFMAX
#define FFMAX(a, b)
Definition: common.h:103
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:62
FF_THREAD_SLICE
#define FF_THREAD_SLICE
Decode more than one part of a single frame at once.
Definition: avcodec.h:1441
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:887
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:58
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:139
height
#define height
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
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:3124
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:1440
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:69
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:2430
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:407
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:316
AVCodecContext::properties
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:1811
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:485
AVHWAccel::decode_slice
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:2116
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:49
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:95
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:1299
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:436
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1386
ptype2mb_type
static const uint32_t ptype2mb_type[7]
Definition: mpeg12dec.c:79
IPUContext::m
MpegEncContext m
Definition: mpeg12dec.c:2979
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:963
MAX_INDEX
#define MAX_INDEX
Definition: mpeg12dec.c:130
AVCodecContext::height
int height
Definition: avcodec.h:557
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:594
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:307
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:1589
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:384
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1448
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:1480
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:1530
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:1514
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:1813
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:1291
AV_EF_AGGRESSIVE
#define AV_EF_AGGRESSIVE
consider things that a sane encoder should not do as an error
Definition: avcodec.h:1329
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:2088
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:572
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:2871
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:2915
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:84
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:409
Mpeg1Context::mpeg_enc_ctx
MpegEncContext mpeg_enc_ctx
Definition: mpeg12dec.c:57
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:411
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:900
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:1385
HWACCEL_VAAPI
#define HWACCEL_VAAPI(codec)
Definition: hwconfig.h:73
mpeg_er.h
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:557
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:59
IPUContext::block
int16_t block[6][64]
Definition: mpeg12dec.c:2982
mpeg_decode_user_data
static void mpeg_decode_user_data(AVCodecContext *avctx, const uint8_t *p, int buf_size)
Definition: mpeg12dec.c:2360
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:1693
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:1692
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:1493
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:742
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:73
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:1701
re
float re
Definition: fft.c:82