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mpeg12dec.c
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1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27 
28 #define UNCHECKED_BITSTREAM_READER 1
29 #include <inttypes.h>
30 
31 #include "libavutil/attributes.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/stereo3d.h"
34 
35 #include "avcodec.h"
36 #include "bytestream.h"
37 #include "error_resilience.h"
38 #include "idctdsp.h"
39 #include "internal.h"
40 #include "mpeg_er.h"
41 #include "mpeg12.h"
42 #include "mpeg12data.h"
43 #include "mpegutils.h"
44 #include "mpegvideo.h"
45 #include "thread.h"
46 #include "version.h"
47 #include "vdpau_internal.h"
48 #include "xvmc_internal.h"
49 
50 typedef struct Mpeg1Context {
51  MpegEncContext mpeg_enc_ctx;
52  int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
53  int repeat_field; /* true if we must repeat the field */
54  AVPanScan pan_scan; /* some temporary storage for the panscan */
55  AVStereo3D stereo3d;
56  int has_stereo3d;
57  uint8_t *a53_caption;
58  int a53_caption_size;
59  uint8_t afd;
60  int has_afd;
61  int slice_count;
62  AVRational save_aspect;
63  int save_width, save_height, save_progressive_seq;
64  AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
65  int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
66  int tmpgexs;
67  int first_slice;
68  int extradata_decoded;
69 } Mpeg1Context;
70 
71 #define MB_TYPE_ZERO_MV 0x20000000
72 
73 static const uint32_t ptype2mb_type[7] = {
74  MB_TYPE_INTRA,
75  MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
76  MB_TYPE_L0,
77  MB_TYPE_L0 | MB_TYPE_CBP,
78  MB_TYPE_QUANT | MB_TYPE_INTRA,
79  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
80  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
81 };
82 
83 static const uint32_t btype2mb_type[11] = {
84  MB_TYPE_INTRA,
85  MB_TYPE_L1,
86  MB_TYPE_L1 | MB_TYPE_CBP,
87  MB_TYPE_L0,
88  MB_TYPE_L0 | MB_TYPE_CBP,
89  MB_TYPE_L0L1,
90  MB_TYPE_L0L1 | MB_TYPE_CBP,
91  MB_TYPE_QUANT | MB_TYPE_INTRA,
92  MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
93  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
94  MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
95 };
96 
97 static const uint8_t non_linear_qscale[32] = {
98  0, 1, 2, 3, 4, 5, 6, 7,
99  8, 10, 12, 14, 16, 18, 20, 22,
100  24, 28, 32, 36, 40, 44, 48, 52,
101  56, 64, 72, 80, 88, 96, 104, 112,
102 };
103 
104 /* as H.263, but only 17 codes */
105 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
106 {
107  int code, sign, val, shift;
108 
109  code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
110  if (code == 0)
111  return pred;
112  if (code < 0)
113  return 0xffff;
114 
115  sign = get_bits1(&s->gb);
116  shift = fcode - 1;
117  val = code;
118  if (shift) {
119  val = (val - 1) << shift;
120  val |= get_bits(&s->gb, shift);
121  val++;
122  }
123  if (sign)
124  val = -val;
125  val += pred;
126 
127  /* modulo decoding */
128  return sign_extend(val, 5 + shift);
129 }
130 
131 #define check_scantable_index(ctx, x) \
132  do { \
133  if ((x) > 63) { \
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 
140 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
141  int16_t *block, int n)
142 {
143  int level, dc, diff, i, j, run;
144  int component;
145  RLTable *rl = &ff_rl_mpeg1;
146  uint8_t *const scantable = s->intra_scantable.permutated;
147  const uint16_t *quant_matrix = s->intra_matrix;
148  const int qscale = s->qscale;
149 
150  /* DC coefficient */
151  component = (n <= 3 ? 0 : n - 4 + 1);
152  diff = decode_dc(&s->gb, component);
153  if (diff >= 0xffff)
154  return AVERROR_INVALIDDATA;
155  dc = s->last_dc[component];
156  dc += diff;
157  s->last_dc[component] = dc;
158  block[0] = dc * quant_matrix[0];
159  av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
160  i = 0;
161  {
162  OPEN_READER(re, &s->gb);
163  UPDATE_CACHE(re, &s->gb);
164  if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
165  goto end;
166 
167  /* now quantify & encode AC coefficients */
168  for (;;) {
169  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
170  TEX_VLC_BITS, 2, 0);
171 
172  if (level != 0) {
173  i += run;
174  check_scantable_index(s, i);
175  j = scantable[i];
176  level = (level * qscale * quant_matrix[j]) >> 4;
177  level = (level - 1) | 1;
178  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
179  SHOW_SBITS(re, &s->gb, 1);
180  SKIP_BITS(re, &s->gb, 1);
181  } else {
182  /* escape */
183  run = SHOW_UBITS(re, &s->gb, 6) + 1;
184  LAST_SKIP_BITS(re, &s->gb, 6);
185  UPDATE_CACHE(re, &s->gb);
186  level = SHOW_SBITS(re, &s->gb, 8);
187  SKIP_BITS(re, &s->gb, 8);
188  if (level == -128) {
189  level = SHOW_UBITS(re, &s->gb, 8) - 256;
190  SKIP_BITS(re, &s->gb, 8);
191  } else if (level == 0) {
192  level = SHOW_UBITS(re, &s->gb, 8);
193  SKIP_BITS(re, &s->gb, 8);
194  }
195  i += run;
196  check_scantable_index(s, i);
197  j = scantable[i];
198  if (level < 0) {
199  level = -level;
200  level = (level * qscale * quant_matrix[j]) >> 4;
201  level = (level - 1) | 1;
202  level = -level;
203  } else {
204  level = (level * qscale * quant_matrix[j]) >> 4;
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 
213  UPDATE_CACHE(re, &s->gb);
214  }
215 end:
216  LAST_SKIP_BITS(re, &s->gb, 2);
217  CLOSE_READER(re, &s->gb);
218  }
219  s->block_last_index[n] = i;
220  return 0;
221 }
222 
223 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
224 {
225  return mpeg1_decode_block_intra(s, block, n);
226 }
227 
228 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
229  int16_t *block, int n)
230 {
231  int level, i, j, run;
232  RLTable *rl = &ff_rl_mpeg1;
233  uint8_t *const scantable = s->intra_scantable.permutated;
234  const uint16_t *quant_matrix = s->inter_matrix;
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 * quant_matrix[0]) >> 5;
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  /* now quantify & encode AC coefficients */
254  for (;;) {
255  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
256  TEX_VLC_BITS, 2, 0);
257 
258  if (level != 0) {
259  i += run;
260  check_scantable_index(s, i);
261  j = scantable[i];
262  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
263  level = (level - 1) | 1;
264  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265  SHOW_SBITS(re, &s->gb, 1);
266  SKIP_BITS(re, &s->gb, 1);
267  } else {
268  /* escape */
269  run = SHOW_UBITS(re, &s->gb, 6) + 1;
270  LAST_SKIP_BITS(re, &s->gb, 6);
271  UPDATE_CACHE(re, &s->gb);
272  level = SHOW_SBITS(re, &s->gb, 8);
273  SKIP_BITS(re, &s->gb, 8);
274  if (level == -128) {
275  level = SHOW_UBITS(re, &s->gb, 8) - 256;
276  SKIP_BITS(re, &s->gb, 8);
277  } else if (level == 0) {
278  level = SHOW_UBITS(re, &s->gb, 8);
279  SKIP_BITS(re, &s->gb, 8);
280  }
281  i += run;
282  check_scantable_index(s, i);
283  j = scantable[i];
284  if (level < 0) {
285  level = -level;
286  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
287  level = (level - 1) | 1;
288  level = -level;
289  } else {
290  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
291  level = (level - 1) | 1;
292  }
293  }
294 
295  block[j] = level;
296  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
297  break;
298  UPDATE_CACHE(re, &s->gb);
299  }
300 end:
301  LAST_SKIP_BITS(re, &s->gb, 2);
302  CLOSE_READER(re, &s->gb);
303  }
304  s->block_last_index[n] = i;
305  return 0;
306 }
307 
308 /**
309  * Note: this function can read out of range and crash for corrupt streams.
310  * Changing this would eat up any speed benefits it has.
311  * Do not use "fast" flag if you need the code to be robust.
312  */
313 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
314  int16_t *block, int n)
315 {
316  int level, i, j, run;
317  RLTable *rl = &ff_rl_mpeg1;
318  uint8_t *const scantable = s->intra_scantable.permutated;
319  const int qscale = s->qscale;
320 
321  {
322  OPEN_READER(re, &s->gb);
323  i = -1;
324  // Special case for first coefficient, no need to add second VLC table.
325  UPDATE_CACHE(re, &s->gb);
326  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
327  level = (3 * qscale) >> 1;
328  level = (level - 1) | 1;
329  if (GET_CACHE(re, &s->gb) & 0x40000000)
330  level = -level;
331  block[0] = level;
332  i++;
333  SKIP_BITS(re, &s->gb, 2);
334  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
335  goto end;
336  }
337 
338  /* now quantify & encode AC coefficients */
339  for (;;) {
340  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
341  TEX_VLC_BITS, 2, 0);
342 
343  if (level != 0) {
344  i += run;
345  check_scantable_index(s, i);
346  j = scantable[i];
347  level = ((level * 2 + 1) * qscale) >> 1;
348  level = (level - 1) | 1;
349  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
350  SHOW_SBITS(re, &s->gb, 1);
351  SKIP_BITS(re, &s->gb, 1);
352  } else {
353  /* escape */
354  run = SHOW_UBITS(re, &s->gb, 6) + 1;
355  LAST_SKIP_BITS(re, &s->gb, 6);
356  UPDATE_CACHE(re, &s->gb);
357  level = SHOW_SBITS(re, &s->gb, 8);
358  SKIP_BITS(re, &s->gb, 8);
359  if (level == -128) {
360  level = SHOW_UBITS(re, &s->gb, 8) - 256;
361  SKIP_BITS(re, &s->gb, 8);
362  } else if (level == 0) {
363  level = SHOW_UBITS(re, &s->gb, 8);
364  SKIP_BITS(re, &s->gb, 8);
365  }
366  i += run;
367  check_scantable_index(s, i);
368  j = scantable[i];
369  if (level < 0) {
370  level = -level;
371  level = ((level * 2 + 1) * qscale) >> 1;
372  level = (level - 1) | 1;
373  level = -level;
374  } else {
375  level = ((level * 2 + 1) * qscale) >> 1;
376  level = (level - 1) | 1;
377  }
378  }
379 
380  block[j] = level;
381  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
382  break;
383  UPDATE_CACHE(re, &s->gb);
384  }
385 end:
386  LAST_SKIP_BITS(re, &s->gb, 2);
387  CLOSE_READER(re, &s->gb);
388  }
389  s->block_last_index[n] = i;
390  return 0;
391 }
392 
393 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
394  int16_t *block, int n)
395 {
396  int level, i, j, run;
397  RLTable *rl = &ff_rl_mpeg1;
398  uint8_t *const scantable = s->intra_scantable.permutated;
399  const uint16_t *quant_matrix;
400  const int qscale = s->qscale;
401  int mismatch;
402 
403  mismatch = 1;
404 
405  {
406  OPEN_READER(re, &s->gb);
407  i = -1;
408  if (n < 4)
409  quant_matrix = s->inter_matrix;
410  else
411  quant_matrix = s->chroma_inter_matrix;
412 
413  // Special case for first coefficient, no need to add second VLC table.
414  UPDATE_CACHE(re, &s->gb);
415  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416  level = (3 * qscale * quant_matrix[0]) >> 5;
417  if (GET_CACHE(re, &s->gb) & 0x40000000)
418  level = -level;
419  block[0] = level;
420  mismatch ^= 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],
430  TEX_VLC_BITS, 2, 0);
431 
432  if (level != 0) {
433  i += run;
434  check_scantable_index(s, i);
435  j = scantable[i];
436  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
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  check_scantable_index(s, i);
450  j = scantable[i];
451  if (level < 0) {
452  level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
453  level = -level;
454  } else {
455  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
456  }
457  }
458 
459  mismatch ^= level;
460  block[j] = level;
461  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
462  break;
463  UPDATE_CACHE(re, &s->gb);
464  }
465 end:
466  LAST_SKIP_BITS(re, &s->gb, 2);
467  CLOSE_READER(re, &s->gb);
468  }
469  block[63] ^= (mismatch & 1);
470 
471  s->block_last_index[n] = i;
472  return 0;
473 }
474 
475 /**
476  * Note: this function can read out of range and crash for corrupt streams.
477  * Changing this would eat up any speed benefits it has.
478  * Do not use "fast" flag if you need the code to be robust.
479  */
480 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
481  int16_t *block, int n)
482 {
483  int level, i, j, run;
484  RLTable *rl = &ff_rl_mpeg1;
485  uint8_t *const scantable = s->intra_scantable.permutated;
486  const int qscale = s->qscale;
487  OPEN_READER(re, &s->gb);
488  i = -1;
489 
490  // special case for first coefficient, no need to add second VLC table
491  UPDATE_CACHE(re, &s->gb);
492  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
493  level = (3 * qscale) >> 1;
494  if (GET_CACHE(re, &s->gb) & 0x40000000)
495  level = -level;
496  block[0] = level;
497  i++;
498  SKIP_BITS(re, &s->gb, 2);
499  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
500  goto end;
501  }
502 
503  /* now quantify & encode AC coefficients */
504  for (;;) {
505  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
506 
507  if (level != 0) {
508  i += run;
509  j = scantable[i];
510  level = ((level * 2 + 1) * qscale) >> 1;
511  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
512  SHOW_SBITS(re, &s->gb, 1);
513  SKIP_BITS(re, &s->gb, 1);
514  } else {
515  /* escape */
516  run = SHOW_UBITS(re, &s->gb, 6) + 1;
517  LAST_SKIP_BITS(re, &s->gb, 6);
518  UPDATE_CACHE(re, &s->gb);
519  level = SHOW_SBITS(re, &s->gb, 12);
520  SKIP_BITS(re, &s->gb, 12);
521 
522  i += run;
523  j = scantable[i];
524  if (level < 0) {
525  level = ((-level * 2 + 1) * qscale) >> 1;
526  level = -level;
527  } else {
528  level = ((level * 2 + 1) * qscale) >> 1;
529  }
530  }
531 
532  block[j] = level;
533  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
534  break;
535 
536  UPDATE_CACHE(re, &s->gb);
537  }
538 end:
539  LAST_SKIP_BITS(re, &s->gb, 2);
540  CLOSE_READER(re, &s->gb);
541  s->block_last_index[n] = i;
542  return 0;
543 }
544 
545 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
546  int16_t *block, int n)
547 {
548  int level, dc, diff, i, j, run;
549  int component;
550  RLTable *rl;
551  uint8_t *const scantable = s->intra_scantable.permutated;
552  const uint16_t *quant_matrix;
553  const int qscale = s->qscale;
554  int mismatch;
555 
556  /* DC coefficient */
557  if (n < 4) {
558  quant_matrix = s->intra_matrix;
559  component = 0;
560  } else {
561  quant_matrix = s->chroma_intra_matrix;
562  component = (n & 1) + 1;
563  }
564  diff = decode_dc(&s->gb, component);
565  if (diff >= 0xffff)
566  return AVERROR_INVALIDDATA;
567  dc = s->last_dc[component];
568  dc += diff;
569  s->last_dc[component] = dc;
570  block[0] = dc << (3 - s->intra_dc_precision);
571  av_dlog(s->avctx, "dc=%d\n", block[0]);
572  mismatch = block[0] ^ 1;
573  i = 0;
574  if (s->intra_vlc_format)
575  rl = &ff_rl_mpeg2;
576  else
577  rl = &ff_rl_mpeg1;
578 
579  {
580  OPEN_READER(re, &s->gb);
581  /* now quantify & encode AC coefficients */
582  for (;;) {
583  UPDATE_CACHE(re, &s->gb);
584  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
585  TEX_VLC_BITS, 2, 0);
586 
587  if (level == 127) {
588  break;
589  } else if (level != 0) {
590  i += run;
591  check_scantable_index(s, i);
592  j = scantable[i];
593  level = (level * qscale * quant_matrix[j]) >> 4;
594  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
595  SHOW_SBITS(re, &s->gb, 1);
596  LAST_SKIP_BITS(re, &s->gb, 1);
597  } else {
598  /* escape */
599  run = SHOW_UBITS(re, &s->gb, 6) + 1;
600  LAST_SKIP_BITS(re, &s->gb, 6);
601  UPDATE_CACHE(re, &s->gb);
602  level = SHOW_SBITS(re, &s->gb, 12);
603  SKIP_BITS(re, &s->gb, 12);
604  i += run;
605  check_scantable_index(s, i);
606  j = scantable[i];
607  if (level < 0) {
608  level = (-level * qscale * quant_matrix[j]) >> 4;
609  level = -level;
610  } else {
611  level = (level * qscale * quant_matrix[j]) >> 4;
612  }
613  }
614 
615  mismatch ^= level;
616  block[j] = level;
617  }
618  CLOSE_READER(re, &s->gb);
619  }
620  block[63] ^= mismatch & 1;
621 
622  s->block_last_index[n] = i;
623  return 0;
624 }
625 
626 /**
627  * Note: this function can read out of range and crash for corrupt streams.
628  * Changing this would eat up any speed benefits it has.
629  * Do not use "fast" flag if you need the code to be robust.
630  */
631 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
632  int16_t *block, int n)
633 {
634  int level, dc, diff, i, j, run;
635  int component;
636  RLTable *rl;
637  uint8_t *const scantable = s->intra_scantable.permutated;
638  const uint16_t *quant_matrix;
639  const int qscale = s->qscale;
640 
641  /* DC coefficient */
642  if (n < 4) {
643  quant_matrix = s->intra_matrix;
644  component = 0;
645  } else {
646  quant_matrix = s->chroma_intra_matrix;
647  component = (n & 1) + 1;
648  }
649  diff = decode_dc(&s->gb, component);
650  if (diff >= 0xffff)
651  return AVERROR_INVALIDDATA;
652  dc = s->last_dc[component];
653  dc += diff;
654  s->last_dc[component] = dc;
655  block[0] = dc << (3 - s->intra_dc_precision);
656  i = 0;
657  if (s->intra_vlc_format)
658  rl = &ff_rl_mpeg2;
659  else
660  rl = &ff_rl_mpeg1;
661 
662  {
663  OPEN_READER(re, &s->gb);
664  /* now quantify & encode AC coefficients */
665  for (;;) {
666  UPDATE_CACHE(re, &s->gb);
667  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
668  TEX_VLC_BITS, 2, 0);
669 
670  if (level >= 64 || i > 63) {
671  break;
672  } else if (level != 0) {
673  i += run;
674  j = scantable[i];
675  level = (level * qscale * quant_matrix[j]) >> 4;
676  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
677  SHOW_SBITS(re, &s->gb, 1);
678  LAST_SKIP_BITS(re, &s->gb, 1);
679  } else {
680  /* escape */
681  run = SHOW_UBITS(re, &s->gb, 6) + 1;
682  LAST_SKIP_BITS(re, &s->gb, 6);
683  UPDATE_CACHE(re, &s->gb);
684  level = SHOW_SBITS(re, &s->gb, 12);
685  SKIP_BITS(re, &s->gb, 12);
686  i += run;
687  j = scantable[i];
688  if (level < 0) {
689  level = (-level * qscale * quant_matrix[j]) >> 4;
690  level = -level;
691  } else {
692  level = (level * qscale * quant_matrix[j]) >> 4;
693  }
694  }
695 
696  block[j] = level;
697  }
698  CLOSE_READER(re, &s->gb);
699  }
700 
701  s->block_last_index[n] = i;
702  return 0;
703 }
704 
705 /******************************************/
706 /* decoding */
707 
708 static inline int get_dmv(MpegEncContext *s)
709 {
710  if (get_bits1(&s->gb))
711  return 1 - (get_bits1(&s->gb) << 1);
712  else
713  return 0;
714 }
715 
716 static inline int get_qscale(MpegEncContext *s)
717 {
718  int qscale = get_bits(&s->gb, 5);
719  if (s->q_scale_type)
720  return non_linear_qscale[qscale];
721  else
722  return qscale << 1;
723 }
724 
725 
726 /* motion type (for MPEG-2) */
727 #define MT_FIELD 1
728 #define MT_FRAME 2
729 #define MT_16X8 2
730 #define MT_DMV 3
731 
732 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
733 {
734  int i, j, k, cbp, val, mb_type, motion_type;
735  const int mb_block_count = 4 + (1 << s->chroma_format);
736  int ret;
737 
738  av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
739 
740  av_assert2(s->mb_skipped == 0);
741 
742  if (s->mb_skip_run-- != 0) {
743  if (s->pict_type == AV_PICTURE_TYPE_P) {
744  s->mb_skipped = 1;
745  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
746  MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
747  } else {
748  int mb_type;
749 
750  if (s->mb_x)
751  mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
752  else
753  // FIXME not sure if this is allowed in MPEG at all
754  mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
755  if (IS_INTRA(mb_type)) {
756  av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
757  return AVERROR_INVALIDDATA;
758  }
759  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
760  mb_type | MB_TYPE_SKIP;
761 
762  if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
763  s->mb_skipped = 1;
764  }
765 
766  return 0;
767  }
768 
769  switch (s->pict_type) {
770  default:
771  case AV_PICTURE_TYPE_I:
772  if (get_bits1(&s->gb) == 0) {
773  if (get_bits1(&s->gb) == 0) {
774  av_log(s->avctx, AV_LOG_ERROR,
775  "invalid mb type in I Frame at %d %d\n",
776  s->mb_x, s->mb_y);
777  return AVERROR_INVALIDDATA;
778  }
779  mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
780  } else {
781  mb_type = MB_TYPE_INTRA;
782  }
783  break;
784  case AV_PICTURE_TYPE_P:
785  mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
786  if (mb_type < 0) {
787  av_log(s->avctx, AV_LOG_ERROR,
788  "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
789  return AVERROR_INVALIDDATA;
790  }
791  mb_type = ptype2mb_type[mb_type];
792  break;
793  case AV_PICTURE_TYPE_B:
794  mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
795  if (mb_type < 0) {
796  av_log(s->avctx, AV_LOG_ERROR,
797  "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
798  return AVERROR_INVALIDDATA;
799  }
800  mb_type = btype2mb_type[mb_type];
801  break;
802  }
803  av_dlog(s->avctx, "mb_type=%x\n", mb_type);
804 // motion_type = 0; /* avoid warning */
805  if (IS_INTRA(mb_type)) {
806  s->bdsp.clear_blocks(s->block[0]);
807 
808  if (!s->chroma_y_shift)
809  s->bdsp.clear_blocks(s->block[6]);
810 
811  /* compute DCT type */
812  // FIXME: add an interlaced_dct coded var?
813  if (s->picture_structure == PICT_FRAME &&
814  !s->frame_pred_frame_dct)
815  s->interlaced_dct = get_bits1(&s->gb);
816 
817  if (IS_QUANT(mb_type))
818  s->qscale = get_qscale(s);
819 
820  if (s->concealment_motion_vectors) {
821  /* just parse them */
822  if (s->picture_structure != PICT_FRAME)
823  skip_bits1(&s->gb); /* field select */
824 
825  s->mv[0][0][0] =
826  s->last_mv[0][0][0] =
827  s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
828  s->last_mv[0][0][0]);
829  s->mv[0][0][1] =
830  s->last_mv[0][0][1] =
831  s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
832  s->last_mv[0][0][1]);
833 
834  skip_bits1(&s->gb); /* marker */
835  } else {
836  /* reset mv prediction */
837  memset(s->last_mv, 0, sizeof(s->last_mv));
838  }
839  s->mb_intra = 1;
840  // if 1, we memcpy blocks in xvmcvideo
841  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
842  ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
843 
844  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
845  if (s->flags2 & CODEC_FLAG2_FAST) {
846  for (i = 0; i < 6; i++)
847  mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
848  } else {
849  for (i = 0; i < mb_block_count; i++)
850  if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
851  return ret;
852  }
853  } else {
854  for (i = 0; i < 6; i++)
855  if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
856  return ret;
857  }
858  } else {
859  if (mb_type & MB_TYPE_ZERO_MV) {
860  av_assert2(mb_type & MB_TYPE_CBP);
861 
862  s->mv_dir = MV_DIR_FORWARD;
863  if (s->picture_structure == PICT_FRAME) {
864  if (s->picture_structure == PICT_FRAME
865  && !s->frame_pred_frame_dct)
866  s->interlaced_dct = get_bits1(&s->gb);
867  s->mv_type = MV_TYPE_16X16;
868  } else {
869  s->mv_type = MV_TYPE_FIELD;
870  mb_type |= MB_TYPE_INTERLACED;
871  s->field_select[0][0] = s->picture_structure - 1;
872  }
873 
874  if (IS_QUANT(mb_type))
875  s->qscale = get_qscale(s);
876 
877  s->last_mv[0][0][0] = 0;
878  s->last_mv[0][0][1] = 0;
879  s->last_mv[0][1][0] = 0;
880  s->last_mv[0][1][1] = 0;
881  s->mv[0][0][0] = 0;
882  s->mv[0][0][1] = 0;
883  } else {
884  av_assert2(mb_type & MB_TYPE_L0L1);
885  // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
886  /* get additional motion vector type */
887  if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
888  motion_type = MT_FRAME;
889  } else {
890  motion_type = get_bits(&s->gb, 2);
891  if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
892  s->interlaced_dct = get_bits1(&s->gb);
893  }
894 
895  if (IS_QUANT(mb_type))
896  s->qscale = get_qscale(s);
897 
898  /* motion vectors */
899  s->mv_dir = (mb_type >> 13) & 3;
900  av_dlog(s->avctx, "motion_type=%d\n", motion_type);
901  switch (motion_type) {
902  case MT_FRAME: /* or MT_16X8 */
903  if (s->picture_structure == PICT_FRAME) {
904  mb_type |= MB_TYPE_16x16;
905  s->mv_type = MV_TYPE_16X16;
906  for (i = 0; i < 2; i++) {
907  if (USES_LIST(mb_type, i)) {
908  /* MT_FRAME */
909  s->mv[i][0][0] =
910  s->last_mv[i][0][0] =
911  s->last_mv[i][1][0] =
912  mpeg_decode_motion(s, s->mpeg_f_code[i][0],
913  s->last_mv[i][0][0]);
914  s->mv[i][0][1] =
915  s->last_mv[i][0][1] =
916  s->last_mv[i][1][1] =
917  mpeg_decode_motion(s, s->mpeg_f_code[i][1],
918  s->last_mv[i][0][1]);
919  /* full_pel: only for MPEG-1 */
920  if (s->full_pel[i]) {
921  s->mv[i][0][0] <<= 1;
922  s->mv[i][0][1] <<= 1;
923  }
924  }
925  }
926  } else {
927  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
928  s->mv_type = MV_TYPE_16X8;
929  for (i = 0; i < 2; i++) {
930  if (USES_LIST(mb_type, i)) {
931  /* MT_16X8 */
932  for (j = 0; j < 2; j++) {
933  s->field_select[i][j] = get_bits1(&s->gb);
934  for (k = 0; k < 2; k++) {
935  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
936  s->last_mv[i][j][k]);
937  s->last_mv[i][j][k] = val;
938  s->mv[i][j][k] = val;
939  }
940  }
941  }
942  }
943  }
944  break;
945  case MT_FIELD:
946  s->mv_type = MV_TYPE_FIELD;
947  if (s->picture_structure == PICT_FRAME) {
948  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
949  for (i = 0; i < 2; i++) {
950  if (USES_LIST(mb_type, i)) {
951  for (j = 0; j < 2; j++) {
952  s->field_select[i][j] = get_bits1(&s->gb);
953  val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
954  s->last_mv[i][j][0]);
955  s->last_mv[i][j][0] = val;
956  s->mv[i][j][0] = val;
957  av_dlog(s->avctx, "fmx=%d\n", val);
958  val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
959  s->last_mv[i][j][1] >> 1);
960  s->last_mv[i][j][1] = val << 1;
961  s->mv[i][j][1] = val;
962  av_dlog(s->avctx, "fmy=%d\n", val);
963  }
964  }
965  }
966  } else {
967  av_assert0(!s->progressive_sequence);
968  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
969  for (i = 0; i < 2; i++) {
970  if (USES_LIST(mb_type, i)) {
971  s->field_select[i][0] = get_bits1(&s->gb);
972  for (k = 0; k < 2; k++) {
973  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
974  s->last_mv[i][0][k]);
975  s->last_mv[i][0][k] = val;
976  s->last_mv[i][1][k] = val;
977  s->mv[i][0][k] = val;
978  }
979  }
980  }
981  }
982  break;
983  case MT_DMV:
984  if (s->progressive_sequence){
985  av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
986  return AVERROR_INVALIDDATA;
987  }
988  s->mv_type = MV_TYPE_DMV;
989  for (i = 0; i < 2; i++) {
990  if (USES_LIST(mb_type, i)) {
991  int dmx, dmy, mx, my, m;
992  const int my_shift = s->picture_structure == PICT_FRAME;
993 
994  mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
995  s->last_mv[i][0][0]);
996  s->last_mv[i][0][0] = mx;
997  s->last_mv[i][1][0] = mx;
998  dmx = get_dmv(s);
999  my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1000  s->last_mv[i][0][1] >> my_shift);
1001  dmy = get_dmv(s);
1002 
1003 
1004  s->last_mv[i][0][1] = my << my_shift;
1005  s->last_mv[i][1][1] = my << my_shift;
1006 
1007  s->mv[i][0][0] = mx;
1008  s->mv[i][0][1] = my;
1009  s->mv[i][1][0] = mx; // not used
1010  s->mv[i][1][1] = my; // not used
1011 
1012  if (s->picture_structure == PICT_FRAME) {
1013  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1014 
1015  // m = 1 + 2 * s->top_field_first;
1016  m = s->top_field_first ? 1 : 3;
1017 
1018  /* top -> top pred */
1019  s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1020  s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1021  m = 4 - m;
1022  s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1023  s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1024  } else {
1025  mb_type |= MB_TYPE_16x16;
1026 
1027  s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1028  s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1029  if (s->picture_structure == PICT_TOP_FIELD)
1030  s->mv[i][2][1]--;
1031  else
1032  s->mv[i][2][1]++;
1033  }
1034  }
1035  }
1036  break;
1037  default:
1038  av_log(s->avctx, AV_LOG_ERROR,
1039  "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1040  return AVERROR_INVALIDDATA;
1041  }
1042  }
1043 
1044  s->mb_intra = 0;
1045  if (HAS_CBP(mb_type)) {
1046  s->bdsp.clear_blocks(s->block[0]);
1047 
1048  cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1049  if (mb_block_count > 6) {
1050  cbp <<= mb_block_count - 6;
1051  cbp |= get_bits(&s->gb, mb_block_count - 6);
1052  s->bdsp.clear_blocks(s->block[6]);
1053  }
1054  if (cbp <= 0) {
1055  av_log(s->avctx, AV_LOG_ERROR,
1056  "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1057  return AVERROR_INVALIDDATA;
1058  }
1059 
1060  // if 1, we memcpy blocks in xvmcvideo
1061  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1062  ff_xvmc_pack_pblocks(s, cbp);
1063 
1064  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1065  if (s->flags2 & CODEC_FLAG2_FAST) {
1066  for (i = 0; i < 6; i++) {
1067  if (cbp & 32)
1068  mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1069  else
1070  s->block_last_index[i] = -1;
1071  cbp += cbp;
1072  }
1073  } else {
1074  cbp <<= 12 - mb_block_count;
1075 
1076  for (i = 0; i < mb_block_count; i++) {
1077  if (cbp & (1 << 11)) {
1078  if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1079  return ret;
1080  } else {
1081  s->block_last_index[i] = -1;
1082  }
1083  cbp += cbp;
1084  }
1085  }
1086  } else {
1087  if (s->flags2 & CODEC_FLAG2_FAST) {
1088  for (i = 0; i < 6; i++) {
1089  if (cbp & 32)
1090  mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1091  else
1092  s->block_last_index[i] = -1;
1093  cbp += cbp;
1094  }
1095  } else {
1096  for (i = 0; i < 6; i++) {
1097  if (cbp & 32) {
1098  if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1099  return ret;
1100  } else {
1101  s->block_last_index[i] = -1;
1102  }
1103  cbp += cbp;
1104  }
1105  }
1106  }
1107  } else {
1108  for (i = 0; i < 12; i++)
1109  s->block_last_index[i] = -1;
1110  }
1111  }
1112 
1113  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1114 
1115  return 0;
1116 }
1117 
1118 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1119 {
1120  Mpeg1Context *s = avctx->priv_data;
1121  MpegEncContext *s2 = &s->mpeg_enc_ctx;
1122 
1123  ff_mpv_decode_defaults(s2);
1124 
1125  if ( avctx->codec_tag != AV_RL32("VCR2")
1126  && avctx->codec_tag != AV_RL32("BW10"))
1127  avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1128  ff_mpv_decode_init(s2, avctx);
1129 
1130  s->mpeg_enc_ctx.avctx = avctx;
1131 
1132  /* we need some permutation to store matrices,
1133  * until the decoder sets the real permutation. */
1134  ff_mpv_idct_init(s2);
1135  ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1136  ff_mpeg12_init_vlcs();
1137 
1138  s->mpeg_enc_ctx_allocated = 0;
1139  s->mpeg_enc_ctx.picture_number = 0;
1140  s->repeat_field = 0;
1141  s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1142  avctx->color_range = AVCOL_RANGE_MPEG;
1143  if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1144  avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1145  else
1146  avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1147  return 0;
1148 }
1149 
1150 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1151  const AVCodecContext *avctx_from)
1152 {
1153  Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1154  MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1155  int err;
1156 
1157  if (avctx == avctx_from ||
1158  !ctx_from->mpeg_enc_ctx_allocated ||
1159  !s1->context_initialized)
1160  return 0;
1161 
1162  err = ff_mpeg_update_thread_context(avctx, avctx_from);
1163  if (err)
1164  return err;
1165 
1166  if (!ctx->mpeg_enc_ctx_allocated)
1167  memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1168 
1169  if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1170  s->picture_number++;
1171 
1172  return 0;
1173 }
1174 
1175 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1176  const uint8_t *new_perm)
1177 {
1178  uint16_t temp_matrix[64];
1179  int i;
1180 
1181  memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1182 
1183  for (i = 0; i < 64; i++)
1184  matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1185 }
1186 
1187 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1188 #if CONFIG_MPEG1_XVMC_HWACCEL
1189  AV_PIX_FMT_XVMC,
1190 #endif
1191 #if CONFIG_MPEG1_VDPAU_HWACCEL
1192  AV_PIX_FMT_VDPAU_MPEG1,
1193  AV_PIX_FMT_VDPAU,
1194 #endif
1195  AV_PIX_FMT_YUV420P,
1196  AV_PIX_FMT_NONE
1197 };
1198 
1199 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1200 #if CONFIG_MPEG2_XVMC_HWACCEL
1201  AV_PIX_FMT_XVMC,
1202 #endif
1203 #if CONFIG_MPEG2_VDPAU_HWACCEL
1204  AV_PIX_FMT_VDPAU_MPEG2,
1205  AV_PIX_FMT_VDPAU,
1206 #endif
1207 #if CONFIG_MPEG2_DXVA2_HWACCEL
1208  AV_PIX_FMT_DXVA2_VLD,
1209 #endif
1210 #if CONFIG_MPEG2_VAAPI_HWACCEL
1211  AV_PIX_FMT_VAAPI_VLD,
1212 #endif
1213  AV_PIX_FMT_YUV420P,
1214  AV_PIX_FMT_NONE
1215 };
1216 
1217 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1218  AV_PIX_FMT_YUV422P,
1219  AV_PIX_FMT_NONE
1220 };
1221 
1222 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1223  AV_PIX_FMT_YUV444P,
1224  AV_PIX_FMT_NONE
1225 };
1226 
1227 static inline int uses_vdpau(AVCodecContext *avctx) {
1228  return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1229 }
1230 
1231 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1232 {
1233  Mpeg1Context *s1 = avctx->priv_data;
1234  MpegEncContext *s = &s1->mpeg_enc_ctx;
1235  const enum AVPixelFormat *pix_fmts;
1236 
1237  if (s->chroma_format < 2)
1238  pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1239  mpeg1_hwaccel_pixfmt_list_420 :
1240  mpeg2_hwaccel_pixfmt_list_420;
1241  else if (s->chroma_format == 2)
1242  pix_fmts = mpeg12_pixfmt_list_422;
1243  else
1244  pix_fmts = mpeg12_pixfmt_list_444;
1245 
1246  return ff_thread_get_format(avctx, pix_fmts);
1247 }
1248 
1249 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1250 {
1251  // until then pix_fmt may be changed right after codec init
1252  if (avctx->hwaccel || uses_vdpau(avctx))
1253  if (avctx->idct_algo == FF_IDCT_AUTO)
1254  avctx->idct_algo = FF_IDCT_SIMPLE;
1255 
1256  if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1257  Mpeg1Context *s1 = avctx->priv_data;
1258  MpegEncContext *s = &s1->mpeg_enc_ctx;
1259 
1260  s->pack_pblocks = 1;
1261 #if FF_API_XVMC
1262  avctx->xvmc_acceleration = 2;
1263 #endif /* FF_API_XVMC */
1264  }
1265 }
1266 
1267 /* Call this function when we know all parameters.
1268  * It may be called in different places for MPEG-1 and MPEG-2. */
1269 static int mpeg_decode_postinit(AVCodecContext *avctx)
1270 {
1271  Mpeg1Context *s1 = avctx->priv_data;
1272  MpegEncContext *s = &s1->mpeg_enc_ctx;
1273  uint8_t old_permutation[64];
1274  int ret;
1275 
1276  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1277  // MPEG-1 aspect
1278  avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1279  } else { // MPEG-2
1280  // MPEG-2 aspect
1281  if (s->aspect_ratio_info > 1) {
1282  AVRational dar =
1283  av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1284  (AVRational) { s1->pan_scan.width,
1285  s1->pan_scan.height }),
1286  (AVRational) { s->width, s->height });
1287 
1288  /* We ignore the spec here and guess a bit as reality does not
1289  * match the spec, see for example res_change_ffmpeg_aspect.ts
1290  * and sequence-display-aspect.mpg.
1291  * issue1613, 621, 562 */
1292  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1293  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1294  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1295  s->avctx->sample_aspect_ratio =
1296  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1297  (AVRational) { s->width, s->height });
1298  } else {
1299  s->avctx->sample_aspect_ratio =
1300  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1301  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1302 // issue1613 4/3 16/9 -> 16/9
1303 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1304 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1305 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1306  av_dlog(avctx, "A %d/%d\n",
1307  ff_mpeg2_aspect[s->aspect_ratio_info].num,
1308  ff_mpeg2_aspect[s->aspect_ratio_info].den);
1309  av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1310  s->avctx->sample_aspect_ratio.den);
1311  }
1312  } else {
1313  s->avctx->sample_aspect_ratio =
1314  ff_mpeg2_aspect[s->aspect_ratio_info];
1315  }
1316  } // MPEG-2
1317 
1318  ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1319 
1320  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1321  avctx->coded_width != s->width ||
1322  avctx->coded_height != s->height ||
1323  s1->save_width != s->width ||
1324  s1->save_height != s->height ||
1325  av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1326  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1327  0) {
1328  if (s1->mpeg_enc_ctx_allocated) {
1329  ParseContext pc = s->parse_context;
1330  s->parse_context.buffer = 0;
1331  ff_mpv_common_end(s);
1332  s->parse_context = pc;
1333  s1->mpeg_enc_ctx_allocated = 0;
1334  }
1335 
1336  ret = ff_set_dimensions(avctx, s->width, s->height);
1337  if (ret < 0)
1338  return ret;
1339 
1340  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1341  avctx->rc_max_rate = s->bit_rate;
1342  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1343  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1344  avctx->bit_rate = s->bit_rate;
1345  }
1346  s1->save_aspect = s->avctx->sample_aspect_ratio;
1347  s1->save_width = s->width;
1348  s1->save_height = s->height;
1349  s1->save_progressive_seq = s->progressive_sequence;
1350 
1351  /* low_delay may be forced, in this case we will have B-frames
1352  * that behave like P-frames. */
1353  avctx->has_b_frames = !s->low_delay;
1354 
1355  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1356  // MPEG-1 fps
1357  avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1358  avctx->ticks_per_frame = 1;
1359  } else { // MPEG-2
1360  // MPEG-2 fps
1361  av_reduce(&s->avctx->framerate.num,
1362  &s->avctx->framerate.den,
1363  ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1364  ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1365  1 << 30);
1366  avctx->ticks_per_frame = 2;
1367  } // MPEG-2
1368 
1369  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1370  setup_hwaccel_for_pixfmt(avctx);
1371 
1372  /* Quantization matrices may need reordering
1373  * if DCT permutation is changed. */
1374  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1375 
1376  ff_mpv_idct_init(s);
1377  if ((ret = ff_mpv_common_init(s)) < 0)
1378  return ret;
1379 
1380  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1381  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1382  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1383  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1384 
1385  s1->mpeg_enc_ctx_allocated = 1;
1386  }
1387  return 0;
1388 }
1389 
1390 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1391  int buf_size)
1392 {
1393  Mpeg1Context *s1 = avctx->priv_data;
1394  MpegEncContext *s = &s1->mpeg_enc_ctx;
1395  int ref, f_code, vbv_delay;
1396 
1397  init_get_bits(&s->gb, buf, buf_size * 8);
1398 
1399  ref = get_bits(&s->gb, 10); /* temporal ref */
1400  s->pict_type = get_bits(&s->gb, 3);
1401  if (s->pict_type == 0 || s->pict_type > 3)
1402  return AVERROR_INVALIDDATA;
1403 
1404  vbv_delay = get_bits(&s->gb, 16);
1405  s->vbv_delay = vbv_delay;
1406  if (s->pict_type == AV_PICTURE_TYPE_P ||
1407  s->pict_type == AV_PICTURE_TYPE_B) {
1408  s->full_pel[0] = get_bits1(&s->gb);
1409  f_code = get_bits(&s->gb, 3);
1410  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1411  return AVERROR_INVALIDDATA;
1412  f_code += !f_code;
1413  s->mpeg_f_code[0][0] = f_code;
1414  s->mpeg_f_code[0][1] = f_code;
1415  }
1416  if (s->pict_type == AV_PICTURE_TYPE_B) {
1417  s->full_pel[1] = get_bits1(&s->gb);
1418  f_code = get_bits(&s->gb, 3);
1419  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1420  return AVERROR_INVALIDDATA;
1421  f_code += !f_code;
1422  s->mpeg_f_code[1][0] = f_code;
1423  s->mpeg_f_code[1][1] = f_code;
1424  }
1425  s->current_picture.f->pict_type = s->pict_type;
1426  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1427 
1428  if (avctx->debug & FF_DEBUG_PICT_INFO)
1429  av_log(avctx, AV_LOG_DEBUG,
1430  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1431 
1432  s->y_dc_scale = 8;
1433  s->c_dc_scale = 8;
1434  return 0;
1435 }
1436 
1437 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1438 {
1439  MpegEncContext *s = &s1->mpeg_enc_ctx;
1440  int horiz_size_ext, vert_size_ext;
1441  int bit_rate_ext;
1442 
1443  skip_bits(&s->gb, 1); /* profile and level esc*/
1444  s->avctx->profile = get_bits(&s->gb, 3);
1445  s->avctx->level = get_bits(&s->gb, 4);
1446  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1447  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1448  horiz_size_ext = get_bits(&s->gb, 2);
1449  vert_size_ext = get_bits(&s->gb, 2);
1450  s->width |= (horiz_size_ext << 12);
1451  s->height |= (vert_size_ext << 12);
1452  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1453  s->bit_rate += (bit_rate_ext << 18) * 400;
1454  skip_bits1(&s->gb); /* marker */
1455  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1456 
1457  s->low_delay = get_bits1(&s->gb);
1458  if (s->flags & CODEC_FLAG_LOW_DELAY)
1459  s->low_delay = 1;
1460 
1461  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1462  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1463 
1464  av_dlog(s->avctx, "sequence extension\n");
1465  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1466 
1467  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1468  av_log(s->avctx, AV_LOG_DEBUG,
1469  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1470  s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1471  s->avctx->rc_buffer_size, s->bit_rate);
1472 }
1473 
1474 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1475 {
1476  MpegEncContext *s = &s1->mpeg_enc_ctx;
1477  int color_description, w, h;
1478 
1479  skip_bits(&s->gb, 3); /* video format */
1480  color_description = get_bits1(&s->gb);
1481  if (color_description) {
1482  s->avctx->color_primaries = get_bits(&s->gb, 8);
1483  s->avctx->color_trc = get_bits(&s->gb, 8);
1484  s->avctx->colorspace = get_bits(&s->gb, 8);
1485  }
1486  w = get_bits(&s->gb, 14);
1487  skip_bits(&s->gb, 1); // marker
1488  h = get_bits(&s->gb, 14);
1489  // remaining 3 bits are zero padding
1490 
1491  s1->pan_scan.width = 16 * w;
1492  s1->pan_scan.height = 16 * h;
1493 
1494  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1495  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1496 }
1497 
1498 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1499 {
1500  MpegEncContext *s = &s1->mpeg_enc_ctx;
1501  int i, nofco;
1502 
1503  nofco = 1;
1504  if (s->progressive_sequence) {
1505  if (s->repeat_first_field) {
1506  nofco++;
1507  if (s->top_field_first)
1508  nofco++;
1509  }
1510  } else {
1511  if (s->picture_structure == PICT_FRAME) {
1512  nofco++;
1513  if (s->repeat_first_field)
1514  nofco++;
1515  }
1516  }
1517  for (i = 0; i < nofco; i++) {
1518  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1519  skip_bits(&s->gb, 1); // marker
1520  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1521  skip_bits(&s->gb, 1); // marker
1522  }
1523 
1524  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1525  av_log(s->avctx, AV_LOG_DEBUG,
1526  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1527  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1528  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1529  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1530 }
1531 
1532 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1533  uint16_t matrix1[64], int intra)
1534 {
1535  int i;
1536 
1537  for (i = 0; i < 64; i++) {
1538  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1539  int v = get_bits(&s->gb, 8);
1540  if (v == 0) {
1541  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1542  return AVERROR_INVALIDDATA;
1543  }
1544  if (intra && i == 0 && v != 8) {
1545  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1546  v = 8; // needed by pink.mpg / issue1046
1547  }
1548  matrix0[j] = v;
1549  if (matrix1)
1550  matrix1[j] = v;
1551  }
1552  return 0;
1553 }
1554 
1555 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1556 {
1557  av_dlog(s->avctx, "matrix extension\n");
1558 
1559  if (get_bits1(&s->gb))
1560  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1561  if (get_bits1(&s->gb))
1562  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1563  if (get_bits1(&s->gb))
1564  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1565  if (get_bits1(&s->gb))
1566  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1567 }
1568 
1569 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1570 {
1571  MpegEncContext *s = &s1->mpeg_enc_ctx;
1572 
1573  s->full_pel[0] = s->full_pel[1] = 0;
1574  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1575  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1576  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1577  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1578  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1579  av_log(s->avctx, AV_LOG_ERROR,
1580  "Missing picture start code, guessing missing values\n");
1581  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1582  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1583  s->pict_type = AV_PICTURE_TYPE_I;
1584  else
1585  s->pict_type = AV_PICTURE_TYPE_P;
1586  } else
1587  s->pict_type = AV_PICTURE_TYPE_B;
1588  s->current_picture.f->pict_type = s->pict_type;
1589  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1590  }
1591  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1592  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1593  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1594  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1595 
1596  s->intra_dc_precision = get_bits(&s->gb, 2);
1597  s->picture_structure = get_bits(&s->gb, 2);
1598  s->top_field_first = get_bits1(&s->gb);
1599  s->frame_pred_frame_dct = get_bits1(&s->gb);
1600  s->concealment_motion_vectors = get_bits1(&s->gb);
1601  s->q_scale_type = get_bits1(&s->gb);
1602  s->intra_vlc_format = get_bits1(&s->gb);
1603  s->alternate_scan = get_bits1(&s->gb);
1604  s->repeat_first_field = get_bits1(&s->gb);
1605  s->chroma_420_type = get_bits1(&s->gb);
1606  s->progressive_frame = get_bits1(&s->gb);
1607 
1608  if (s->alternate_scan) {
1609  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1610  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1611  } else {
1612  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1613  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1614  }
1615 
1616  /* composite display not parsed */
1617  av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1618  av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1619  av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1620  av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1621  av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1622  av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1623  av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1624  av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1625  av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1626 }
1627 
1628 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1629 {
1630  AVCodecContext *avctx = s->avctx;
1631  Mpeg1Context *s1 = (Mpeg1Context *) s;
1632  int ret;
1633 
1634  /* start frame decoding */
1635  if (s->first_field || s->picture_structure == PICT_FRAME) {
1636  AVFrameSideData *pan_scan;
1637 
1638  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1639  return ret;
1640 
1641  ff_mpeg_er_frame_start(s);
1642 
1643  /* first check if we must repeat the frame */
1644  s->current_picture_ptr->f->repeat_pict = 0;
1645  if (s->repeat_first_field) {
1646  if (s->progressive_sequence) {
1647  if (s->top_field_first)
1648  s->current_picture_ptr->f->repeat_pict = 4;
1649  else
1650  s->current_picture_ptr->f->repeat_pict = 2;
1651  } else if (s->progressive_frame) {
1652  s->current_picture_ptr->f->repeat_pict = 1;
1653  }
1654  }
1655 
1656  pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1657  AV_FRAME_DATA_PANSCAN,
1658  sizeof(s1->pan_scan));
1659  if (!pan_scan)
1660  return AVERROR(ENOMEM);
1661  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1662 
1663  if (s1->a53_caption) {
1664  AVFrameSideData *sd = av_frame_new_side_data(
1665  s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1666  s1->a53_caption_size);
1667  if (sd)
1668  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1669  av_freep(&s1->a53_caption);
1670  }
1671 
1672  if (s1->has_stereo3d) {
1673  AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1674  if (!stereo)
1675  return AVERROR(ENOMEM);
1676 
1677  *stereo = s1->stereo3d;
1678  s1->has_stereo3d = 0;
1679  }
1680 
1681  if (s1->has_afd) {
1682  AVFrameSideData *sd =
1683  av_frame_new_side_data(s->current_picture_ptr->f,
1684  AV_FRAME_DATA_AFD, 1);
1685  if (!sd)
1686  return AVERROR(ENOMEM);
1687 
1688  *sd->data = s1->afd;
1689  s1->has_afd = 0;
1690  }
1691 
1692  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1693  ff_thread_finish_setup(avctx);
1694  } else { // second field
1695  int i;
1696 
1697  if (!s->current_picture_ptr) {
1698  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1699  return AVERROR_INVALIDDATA;
1700  }
1701 
1702  if (s->avctx->hwaccel &&
1703  (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1704  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1705  av_log(avctx, AV_LOG_ERROR,
1706  "hardware accelerator failed to decode first field\n");
1707  }
1708 
1709  for (i = 0; i < 4; i++) {
1710  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1711  if (s->picture_structure == PICT_BOTTOM_FIELD)
1712  s->current_picture.f->data[i] +=
1713  s->current_picture_ptr->f->linesize[i];
1714  }
1715  }
1716 
1717  if (avctx->hwaccel) {
1718  if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1719  return ret;
1720  }
1721 
1722  return 0;
1723 }
1724 
1725 #define DECODE_SLICE_ERROR -1
1726 #define DECODE_SLICE_OK 0
1727 
1728 /**
1729  * Decode a slice.
1730  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1731  * @return DECODE_SLICE_ERROR if the slice is damaged,
1732  * DECODE_SLICE_OK if this slice is OK
1733  */
1734 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1735  const uint8_t **buf, int buf_size)
1736 {
1737  AVCodecContext *avctx = s->avctx;
1738  const int lowres = s->avctx->lowres;
1739  const int field_pic = s->picture_structure != PICT_FRAME;
1740  int ret;
1741 
1742  s->resync_mb_x =
1743  s->resync_mb_y = -1;
1744 
1745  av_assert0(mb_y < s->mb_height);
1746 
1747  init_get_bits(&s->gb, *buf, buf_size * 8);
1748  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1749  skip_bits(&s->gb, 3);
1750 
1751  ff_mpeg1_clean_buffers(s);
1752  s->interlaced_dct = 0;
1753 
1754  s->qscale = get_qscale(s);
1755 
1756  if (s->qscale == 0) {
1757  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1758  return AVERROR_INVALIDDATA;
1759  }
1760 
1761  /* extra slice info */
1762  if (skip_1stop_8data_bits(&s->gb) < 0)
1763  return AVERROR_INVALIDDATA;
1764 
1765  s->mb_x = 0;
1766 
1767  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1768  skip_bits1(&s->gb);
1769  } else {
1770  while (get_bits_left(&s->gb) > 0) {
1771  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1772  MBINCR_VLC_BITS, 2);
1773  if (code < 0) {
1774  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1775  return AVERROR_INVALIDDATA;
1776  }
1777  if (code >= 33) {
1778  if (code == 33)
1779  s->mb_x += 33;
1780  /* otherwise, stuffing, nothing to do */
1781  } else {
1782  s->mb_x += code;
1783  break;
1784  }
1785  }
1786  }
1787 
1788  if (s->mb_x >= (unsigned) s->mb_width) {
1789  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1790  return AVERROR_INVALIDDATA;
1791  }
1792 
1793  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1794  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1795  int start_code = -1;
1796  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1797  if (buf_end < *buf + buf_size)
1798  buf_end -= 4;
1799  s->mb_y = mb_y;
1800  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1801  return DECODE_SLICE_ERROR;
1802  *buf = buf_end;
1803  return DECODE_SLICE_OK;
1804  }
1805 
1806  s->resync_mb_x = s->mb_x;
1807  s->resync_mb_y = s->mb_y = mb_y;
1808  s->mb_skip_run = 0;
1809  ff_init_block_index(s);
1810 
1811  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1812  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1813  av_log(s->avctx, AV_LOG_DEBUG,
1814  "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",
1815  s->qscale,
1816  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1817  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1818  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1819  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1820  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1821  s->progressive_sequence ? "ps" : "",
1822  s->progressive_frame ? "pf" : "",
1823  s->alternate_scan ? "alt" : "",
1824  s->top_field_first ? "top" : "",
1825  s->intra_dc_precision, s->picture_structure,
1826  s->frame_pred_frame_dct, s->concealment_motion_vectors,
1827  s->q_scale_type, s->intra_vlc_format,
1828  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1829  }
1830  }
1831 
1832  for (;;) {
1833  // If 1, we memcpy blocks in xvmcvideo.
1834  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1835  ff_xvmc_init_block(s); // set s->block
1836 
1837  if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1838  return ret;
1839 
1840  // Note motion_val is normally NULL unless we want to extract the MVs.
1841  if (s->current_picture.motion_val[0] && !s->encoding) {
1842  const int wrap = s->b8_stride;
1843  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1844  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1845  int motion_x, motion_y, dir, i;
1846 
1847  for (i = 0; i < 2; i++) {
1848  for (dir = 0; dir < 2; dir++) {
1849  if (s->mb_intra ||
1850  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1851  motion_x = motion_y = 0;
1852  } else if (s->mv_type == MV_TYPE_16X16 ||
1853  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1854  motion_x = s->mv[dir][0][0];
1855  motion_y = s->mv[dir][0][1];
1856  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1857  motion_x = s->mv[dir][i][0];
1858  motion_y = s->mv[dir][i][1];
1859  }
1860 
1861  s->current_picture.motion_val[dir][xy][0] = motion_x;
1862  s->current_picture.motion_val[dir][xy][1] = motion_y;
1863  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1864  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1865  s->current_picture.ref_index [dir][b8_xy] =
1866  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1867  av_assert2(s->field_select[dir][i] == 0 ||
1868  s->field_select[dir][i] == 1);
1869  }
1870  xy += wrap;
1871  b8_xy += 2;
1872  }
1873  }
1874 
1875  s->dest[0] += 16 >> lowres;
1876  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1877  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1878 
1879  ff_mpv_decode_mb(s, s->block);
1880 
1881  if (++s->mb_x >= s->mb_width) {
1882  const int mb_size = 16 >> s->avctx->lowres;
1883 
1884  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1885  ff_mpv_report_decode_progress(s);
1886 
1887  s->mb_x = 0;
1888  s->mb_y += 1 << field_pic;
1889 
1890  if (s->mb_y >= s->mb_height) {
1891  int left = get_bits_left(&s->gb);
1892  int is_d10 = s->chroma_format == 2 &&
1893  s->pict_type == AV_PICTURE_TYPE_I &&
1894  avctx->profile == 0 && avctx->level == 5 &&
1895  s->intra_dc_precision == 2 &&
1896  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1897  s->progressive_frame == 0
1898  /* vbv_delay == 0xBBB || 0xE10 */;
1899 
1900  if (left >= 32 && !is_d10) {
1901  GetBitContext gb = s->gb;
1902  align_get_bits(&gb);
1903  if (show_bits(&gb, 24) == 0x060E2B) {
1904  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1905  is_d10 = 1;
1906  }
1907  }
1908 
1909  if (left < 0 ||
1910  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1911  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1912  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1913  left, show_bits(&s->gb, FFMIN(left, 23)));
1914  return AVERROR_INVALIDDATA;
1915  } else
1916  goto eos;
1917  }
1918  // There are some files out there which are missing the last slice
1919  // in cases where the slice is completely outside the visible
1920  // area, we detect this here instead of running into the end expecting
1921  // more data
1922  if (s->mb_y >= ((s->height + 15) >> 4) &&
1923  s->progressive_frame &&
1924  !s->progressive_sequence &&
1925  get_bits_left(&s->gb) <= 8 &&
1926  get_bits_left(&s->gb) >= 0 &&
1927  s->mb_skip_run == -1 &&
1928  show_bits(&s->gb, 8) == 0)
1929  goto eos;
1930 
1931  ff_init_block_index(s);
1932  }
1933 
1934  /* skip mb handling */
1935  if (s->mb_skip_run == -1) {
1936  /* read increment again */
1937  s->mb_skip_run = 0;
1938  for (;;) {
1939  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1940  MBINCR_VLC_BITS, 2);
1941  if (code < 0) {
1942  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1943  return AVERROR_INVALIDDATA;
1944  }
1945  if (code >= 33) {
1946  if (code == 33) {
1947  s->mb_skip_run += 33;
1948  } else if (code == 35) {
1949  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1950  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1951  return AVERROR_INVALIDDATA;
1952  }
1953  goto eos; /* end of slice */
1954  }
1955  /* otherwise, stuffing, nothing to do */
1956  } else {
1957  s->mb_skip_run += code;
1958  break;
1959  }
1960  }
1961  if (s->mb_skip_run) {
1962  int i;
1963  if (s->pict_type == AV_PICTURE_TYPE_I) {
1964  av_log(s->avctx, AV_LOG_ERROR,
1965  "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1966  return AVERROR_INVALIDDATA;
1967  }
1968 
1969  /* skip mb */
1970  s->mb_intra = 0;
1971  for (i = 0; i < 12; i++)
1972  s->block_last_index[i] = -1;
1973  if (s->picture_structure == PICT_FRAME)
1974  s->mv_type = MV_TYPE_16X16;
1975  else
1976  s->mv_type = MV_TYPE_FIELD;
1977  if (s->pict_type == AV_PICTURE_TYPE_P) {
1978  /* if P type, zero motion vector is implied */
1979  s->mv_dir = MV_DIR_FORWARD;
1980  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1981  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1982  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1983  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1984  } else {
1985  /* if B type, reuse previous vectors and directions */
1986  s->mv[0][0][0] = s->last_mv[0][0][0];
1987  s->mv[0][0][1] = s->last_mv[0][0][1];
1988  s->mv[1][0][0] = s->last_mv[1][0][0];
1989  s->mv[1][0][1] = s->last_mv[1][0][1];
1990  }
1991  }
1992  }
1993  }
1994 eos: // end of slice
1995  if (get_bits_left(&s->gb) < 0) {
1996  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1997  return AVERROR_INVALIDDATA;
1998  }
1999  *buf += (get_bits_count(&s->gb) - 1) / 8;
2000  av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2001  return 0;
2002 }
2003 
2004 static int slice_decode_thread(AVCodecContext *c, void *arg)
2005 {
2006  MpegEncContext *s = *(void **) arg;
2007  const uint8_t *buf = s->gb.buffer;
2008  int mb_y = s->start_mb_y;
2009  const int field_pic = s->picture_structure != PICT_FRAME;
2010 
2011  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2012 
2013  for (;;) {
2014  uint32_t start_code;
2015  int ret;
2016 
2017  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2018  emms_c();
2019  av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2020  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2021  s->start_mb_y, s->end_mb_y, s->er.error_count);
2022  if (ret < 0) {
2023  if (c->err_recognition & AV_EF_EXPLODE)
2024  return ret;
2025  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2026  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2027  s->mb_x, s->mb_y,
2028  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2029  } else {
2030  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2031  s->mb_x - 1, s->mb_y,
2032  ER_AC_END | ER_DC_END | ER_MV_END);
2033  }
2034 
2035  if (s->mb_y == s->end_mb_y)
2036  return 0;
2037 
2038  start_code = -1;
2039  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2040  mb_y = start_code - SLICE_MIN_START_CODE;
2041  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2042  mb_y += (*buf&0xE0)<<2;
2043  mb_y <<= field_pic;
2044  if (s->picture_structure == PICT_BOTTOM_FIELD)
2045  mb_y++;
2046  if (mb_y < 0 || mb_y >= s->end_mb_y)
2047  return AVERROR_INVALIDDATA;
2048  }
2049 }
2050 
2051 /**
2052  * Handle slice ends.
2053  * @return 1 if it seems to be the last slice
2054  */
2055 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2056 {
2057  Mpeg1Context *s1 = avctx->priv_data;
2058  MpegEncContext *s = &s1->mpeg_enc_ctx;
2059 
2060  if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2061  return 0;
2062 
2063  if (s->avctx->hwaccel) {
2064  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2065  av_log(avctx, AV_LOG_ERROR,
2066  "hardware accelerator failed to decode picture\n");
2067  }
2068 
2069  /* end of slice reached */
2070  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2071  /* end of image */
2072 
2073  ff_er_frame_end(&s->er);
2074 
2075  ff_mpv_frame_end(s);
2076 
2077  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2078  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2079  if (ret < 0)
2080  return ret;
2081  ff_print_debug_info(s, s->current_picture_ptr, pict);
2082  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2083  } else {
2084  if (avctx->active_thread_type & FF_THREAD_FRAME)
2085  s->picture_number++;
2086  /* latency of 1 frame for I- and P-frames */
2087  /* XXX: use another variable than picture_number */
2088  if (s->last_picture_ptr) {
2089  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2090  if (ret < 0)
2091  return ret;
2092  ff_print_debug_info(s, s->last_picture_ptr, pict);
2093  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2094  }
2095  }
2096 
2097  return 1;
2098  } else {
2099  return 0;
2100  }
2101 }
2102 
2103 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2104  const uint8_t *buf, int buf_size)
2105 {
2106  Mpeg1Context *s1 = avctx->priv_data;
2107  MpegEncContext *s = &s1->mpeg_enc_ctx;
2108  int width, height;
2109  int i, v, j;
2110 
2111  init_get_bits(&s->gb, buf, buf_size * 8);
2112 
2113  width = get_bits(&s->gb, 12);
2114  height = get_bits(&s->gb, 12);
2115  if (width == 0 || height == 0) {
2116  av_log(avctx, AV_LOG_WARNING,
2117  "Invalid horizontal or vertical size value.\n");
2118  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2119  return AVERROR_INVALIDDATA;
2120  }
2121  s->aspect_ratio_info = get_bits(&s->gb, 4);
2122  if (s->aspect_ratio_info == 0) {
2123  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2124  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2125  return AVERROR_INVALIDDATA;
2126  }
2127  s->frame_rate_index = get_bits(&s->gb, 4);
2128  if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2129  av_log(avctx, AV_LOG_WARNING,
2130  "frame_rate_index %d is invalid\n", s->frame_rate_index);
2131  s->frame_rate_index = 1;
2132  }
2133  s->bit_rate = get_bits(&s->gb, 18) * 400;
2134  if (get_bits1(&s->gb) == 0) { /* marker */
2135  av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2136  return AVERROR_INVALIDDATA;
2137  }
2138  s->width = width;
2139  s->height = height;
2140 
2141  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2142  skip_bits(&s->gb, 1);
2143 
2144  /* get matrix */
2145  if (get_bits1(&s->gb)) {
2146  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2147  } else {
2148  for (i = 0; i < 64; i++) {
2149  j = s->idsp.idct_permutation[i];
2150  v = ff_mpeg1_default_intra_matrix[i];
2151  s->intra_matrix[j] = v;
2152  s->chroma_intra_matrix[j] = v;
2153  }
2154  }
2155  if (get_bits1(&s->gb)) {
2156  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2157  } else {
2158  for (i = 0; i < 64; i++) {
2159  int j = s->idsp.idct_permutation[i];
2160  v = ff_mpeg1_default_non_intra_matrix[i];
2161  s->inter_matrix[j] = v;
2162  s->chroma_inter_matrix[j] = v;
2163  }
2164  }
2165 
2166  if (show_bits(&s->gb, 23) != 0) {
2167  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2168  return AVERROR_INVALIDDATA;
2169  }
2170 
2171  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2172  s->progressive_sequence = 1;
2173  s->progressive_frame = 1;
2174  s->picture_structure = PICT_FRAME;
2175  s->first_field = 0;
2176  s->frame_pred_frame_dct = 1;
2177  s->chroma_format = 1;
2178  s->codec_id =
2179  s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2180  s->out_format = FMT_MPEG1;
2181  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2182  if (s->flags & CODEC_FLAG_LOW_DELAY)
2183  s->low_delay = 1;
2184 
2185  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2186  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2187  s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2188 
2189  return 0;
2190 }
2191 
2192 static int vcr2_init_sequence(AVCodecContext *avctx)
2193 {
2194  Mpeg1Context *s1 = avctx->priv_data;
2195  MpegEncContext *s = &s1->mpeg_enc_ctx;
2196  int i, v, ret;
2197 
2198  /* start new MPEG-1 context decoding */
2199  s->out_format = FMT_MPEG1;
2200  if (s1->mpeg_enc_ctx_allocated) {
2201  ff_mpv_common_end(s);
2202  s1->mpeg_enc_ctx_allocated = 0;
2203  }
2204  s->width = avctx->coded_width;
2205  s->height = avctx->coded_height;
2206  avctx->has_b_frames = 0; // true?
2207  s->low_delay = 1;
2208 
2209  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2210  setup_hwaccel_for_pixfmt(avctx);
2211 
2212  ff_mpv_idct_init(s);
2213  if ((ret = ff_mpv_common_init(s)) < 0)
2214  return ret;
2215  s1->mpeg_enc_ctx_allocated = 1;
2216 
2217  for (i = 0; i < 64; i++) {
2218  int j = s->idsp.idct_permutation[i];
2219  v = ff_mpeg1_default_intra_matrix[i];
2220  s->intra_matrix[j] = v;
2221  s->chroma_intra_matrix[j] = v;
2222 
2223  v = ff_mpeg1_default_non_intra_matrix[i];
2224  s->inter_matrix[j] = v;
2225  s->chroma_inter_matrix[j] = v;
2226  }
2227 
2228  s->progressive_sequence = 1;
2229  s->progressive_frame = 1;
2230  s->picture_structure = PICT_FRAME;
2231  s->first_field = 0;
2232  s->frame_pred_frame_dct = 1;
2233  s->chroma_format = 1;
2234  if (s->codec_tag == AV_RL32("BW10")) {
2235  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2236  } else {
2237  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2238  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2239  }
2240  s1->save_width = s->width;
2241  s1->save_height = s->height;
2242  s1->save_progressive_seq = s->progressive_sequence;
2243  return 0;
2244 }
2245 
2246 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2247  const uint8_t *p, int buf_size)
2248 {
2249  Mpeg1Context *s1 = avctx->priv_data;
2250 
2251  if (buf_size >= 6 &&
2252  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2253  p[4] == 3 && (p[5] & 0x40)) {
2254  /* extract A53 Part 4 CC data */
2255  int cc_count = p[5] & 0x1f;
2256  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2257  av_freep(&s1->a53_caption);
2258  s1->a53_caption_size = cc_count * 3;
2259  s1->a53_caption = av_malloc(s1->a53_caption_size);
2260  if (s1->a53_caption)
2261  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2262  }
2263  return 1;
2264  } else if (buf_size >= 11 &&
2265  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2266  /* extract DVD CC data */
2267  int cc_count = 0;
2268  int i;
2269  // There is a caption count field in the data, but it is often
2270  // incorect. So count the number of captions present.
2271  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2272  cc_count++;
2273  // Transform the DVD format into A53 Part 4 format
2274  if (cc_count > 0) {
2275  av_freep(&s1->a53_caption);
2276  s1->a53_caption_size = cc_count * 6;
2277  s1->a53_caption = av_malloc(s1->a53_caption_size);
2278  if (s1->a53_caption) {
2279  uint8_t field1 = !!(p[4] & 0x80);
2280  uint8_t *cap = s1->a53_caption;
2281  p += 5;
2282  for (i = 0; i < cc_count; i++) {
2283  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2284  cap[1] = p[1];
2285  cap[2] = p[2];
2286  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2287  cap[4] = p[4];
2288  cap[5] = p[5];
2289  cap += 6;
2290  p += 6;
2291  }
2292  }
2293  }
2294  return 1;
2295  }
2296  return 0;
2297 }
2298 
2299 static void mpeg_decode_user_data(AVCodecContext *avctx,
2300  const uint8_t *p, int buf_size)
2301 {
2302  Mpeg1Context *s = avctx->priv_data;
2303  const uint8_t *buf_end = p + buf_size;
2304  Mpeg1Context *s1 = avctx->priv_data;
2305 
2306 #if 0
2307  int i;
2308  for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2309  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2310  }
2311  av_log(avctx, AV_LOG_ERROR, "\n");
2312 #endif
2313 
2314  if (buf_size > 29){
2315  int i;
2316  for(i=0; i<20; i++)
2317  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2318  s->tmpgexs= 1;
2319  }
2320  }
2321  /* we parse the DTG active format information */
2322  if (buf_end - p >= 5 &&
2323  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2324  int flags = p[4];
2325  p += 5;
2326  if (flags & 0x80) {
2327  /* skip event id */
2328  p += 2;
2329  }
2330  if (flags & 0x40) {
2331  if (buf_end - p < 1)
2332  return;
2333 #if FF_API_AFD
2334 FF_DISABLE_DEPRECATION_WARNINGS
2335  avctx->dtg_active_format = p[0] & 0x0f;
2336 FF_ENABLE_DEPRECATION_WARNINGS
2337 #endif /* FF_API_AFD */
2338  s1->has_afd = 1;
2339  s1->afd = p[0] & 0x0f;
2340  }
2341  } else if (buf_end - p >= 6 &&
2342  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2343  p[4] == 0x03) { // S3D_video_format_length
2344  // the 0x7F mask ignores the reserved_bit value
2345  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2346 
2347  if (S3D_video_format_type == 0x03 ||
2348  S3D_video_format_type == 0x04 ||
2349  S3D_video_format_type == 0x08 ||
2350  S3D_video_format_type == 0x23) {
2351 
2352  s1->has_stereo3d = 1;
2353 
2354  switch (S3D_video_format_type) {
2355  case 0x03:
2356  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2357  break;
2358  case 0x04:
2359  s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2360  break;
2361  case 0x08:
2362  s1->stereo3d.type = AV_STEREO3D_2D;
2363  break;
2364  case 0x23:
2365  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2366  break;
2367  }
2368  }
2369  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2370  return;
2371  }
2372 }
2373 
2374 static void mpeg_decode_gop(AVCodecContext *avctx,
2375  const uint8_t *buf, int buf_size)
2376 {
2377  Mpeg1Context *s1 = avctx->priv_data;
2378  MpegEncContext *s = &s1->mpeg_enc_ctx;
2379  int broken_link;
2380  int64_t tc;
2381 
2382  init_get_bits(&s->gb, buf, buf_size * 8);
2383 
2384  tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2385 
2386  s->closed_gop = get_bits1(&s->gb);
2387  /* broken_link indicate that after editing the
2388  * reference frames of the first B-Frames after GOP I-Frame
2389  * are missing (open gop) */
2390  broken_link = get_bits1(&s->gb);
2391 
2392  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2393  char tcbuf[AV_TIMECODE_STR_SIZE];
2394  av_timecode_make_mpeg_tc_string(tcbuf, tc);
2395  av_log(s->avctx, AV_LOG_DEBUG,
2396  "GOP (%s) closed_gop=%d broken_link=%d\n",
2397  tcbuf, s->closed_gop, broken_link);
2398  }
2399 }
2400 
2401 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2402  int *got_output, const uint8_t *buf, int buf_size)
2403 {
2404  Mpeg1Context *s = avctx->priv_data;
2405  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2406  const uint8_t *buf_ptr = buf;
2407  const uint8_t *buf_end = buf + buf_size;
2408  int ret, input_size;
2409  int last_code = 0, skip_frame = 0;
2410  int picture_start_code_seen = 0;
2411 
2412  for (;;) {
2413  /* find next start code */
2414  uint32_t start_code = -1;
2415  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2416  if (start_code > 0x1ff) {
2417  if (!skip_frame) {
2418  if (HAVE_THREADS &&
2419  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2420  !avctx->hwaccel) {
2421  int i;
2422  av_assert0(avctx->thread_count > 1);
2423 
2424  avctx->execute(avctx, slice_decode_thread,
2425  &s2->thread_context[0], NULL,
2426  s->slice_count, sizeof(void *));
2427  for (i = 0; i < s->slice_count; i++)
2428  s2->er.error_count += s2->thread_context[i]->er.error_count;
2429  }
2430 
2431  if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2432  && uses_vdpau(avctx))
2433  ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2434 
2435  ret = slice_end(avctx, picture);
2436  if (ret < 0)
2437  return ret;
2438  else if (ret) {
2439  // FIXME: merge with the stuff in mpeg_decode_slice
2440  if (s2->last_picture_ptr || s2->low_delay)
2441  *got_output = 1;
2442  }
2443  }
2444  s2->pict_type = 0;
2445 
2446  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2447  return AVERROR_INVALIDDATA;
2448 
2449  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2450  }
2451 
2452  input_size = buf_end - buf_ptr;
2453 
2454  if (avctx->debug & FF_DEBUG_STARTCODE)
2455  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2456  start_code, buf_ptr - buf, input_size);
2457 
2458  /* prepare data for next start code */
2459  switch (start_code) {
2460  case SEQ_START_CODE:
2461  if (last_code == 0) {
2462  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2463  if (buf != avctx->extradata)
2464  s->sync = 1;
2465  } else {
2466  av_log(avctx, AV_LOG_ERROR,
2467  "ignoring SEQ_START_CODE after %X\n", last_code);
2468  if (avctx->err_recognition & AV_EF_EXPLODE)
2469  return AVERROR_INVALIDDATA;
2470  }
2471  break;
2472 
2473  case PICTURE_START_CODE:
2474  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2475  /* If it's a frame picture, there can't be more than one picture header.
2476  Yet, it does happen and we need to handle it. */
2477  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2478  break;
2479  }
2480  picture_start_code_seen = 1;
2481 
2482  if (s2->width <= 0 || s2->height <= 0) {
2483  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2484  s2->width, s2->height);
2485  return AVERROR_INVALIDDATA;
2486  }
2487 
2488  if (s->tmpgexs){
2489  s2->intra_dc_precision= 3;
2490  s2->intra_matrix[0]= 1;
2491  }
2492  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2493  !avctx->hwaccel && s->slice_count) {
2494  int i;
2495 
2496  avctx->execute(avctx, slice_decode_thread,
2497  s2->thread_context, NULL,
2498  s->slice_count, sizeof(void *));
2499  for (i = 0; i < s->slice_count; i++)
2500  s2->er.error_count += s2->thread_context[i]->er.error_count;
2501  s->slice_count = 0;
2502  }
2503  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2504  ret = mpeg_decode_postinit(avctx);
2505  if (ret < 0) {
2506  av_log(avctx, AV_LOG_ERROR,
2507  "mpeg_decode_postinit() failure\n");
2508  return ret;
2509  }
2510 
2511  /* We have a complete image: we try to decompress it. */
2512  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2513  s2->pict_type = 0;
2514  s->first_slice = 1;
2515  last_code = PICTURE_START_CODE;
2516  } else {
2517  av_log(avctx, AV_LOG_ERROR,
2518  "ignoring pic after %X\n", last_code);
2519  if (avctx->err_recognition & AV_EF_EXPLODE)
2520  return AVERROR_INVALIDDATA;
2521  }
2522  break;
2523  case EXT_START_CODE:
2524  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2525 
2526  switch (get_bits(&s2->gb, 4)) {
2527  case 0x1:
2528  if (last_code == 0) {
2529  mpeg_decode_sequence_extension(s);
2530  } else {
2531  av_log(avctx, AV_LOG_ERROR,
2532  "ignoring seq ext after %X\n", last_code);
2533  if (avctx->err_recognition & AV_EF_EXPLODE)
2534  return AVERROR_INVALIDDATA;
2535  }
2536  break;
2537  case 0x2:
2538  mpeg_decode_sequence_display_extension(s);
2539  break;
2540  case 0x3:
2541  mpeg_decode_quant_matrix_extension(s2);
2542  break;
2543  case 0x7:
2544  mpeg_decode_picture_display_extension(s);
2545  break;
2546  case 0x8:
2547  if (last_code == PICTURE_START_CODE) {
2548  mpeg_decode_picture_coding_extension(s);
2549  } else {
2550  av_log(avctx, AV_LOG_ERROR,
2551  "ignoring pic cod ext after %X\n", last_code);
2552  if (avctx->err_recognition & AV_EF_EXPLODE)
2553  return AVERROR_INVALIDDATA;
2554  }
2555  break;
2556  }
2557  break;
2558  case USER_START_CODE:
2559  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2560  break;
2561  case GOP_START_CODE:
2562  if (last_code == 0) {
2563  s2->first_field = 0;
2564  mpeg_decode_gop(avctx, buf_ptr, input_size);
2565  s->sync = 1;
2566  } else {
2567  av_log(avctx, AV_LOG_ERROR,
2568  "ignoring GOP_START_CODE after %X\n", last_code);
2569  if (avctx->err_recognition & AV_EF_EXPLODE)
2570  return AVERROR_INVALIDDATA;
2571  }
2572  break;
2573  default:
2574  if (start_code >= SLICE_MIN_START_CODE &&
2575  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2576  if (s2->progressive_sequence && !s2->progressive_frame) {
2577  s2->progressive_frame = 1;
2578  av_log(s2->avctx, AV_LOG_ERROR,
2579  "interlaced frame in progressive sequence, ignoring\n");
2580  }
2581 
2582  if (s2->picture_structure == 0 ||
2583  (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2584  av_log(s2->avctx, AV_LOG_ERROR,
2585  "picture_structure %d invalid, ignoring\n",
2586  s2->picture_structure);
2587  s2->picture_structure = PICT_FRAME;
2588  }
2589 
2590  if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2591  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2592 
2593  if (s2->picture_structure == PICT_FRAME) {
2594  s2->first_field = 0;
2595  s2->v_edge_pos = 16 * s2->mb_height;
2596  } else {
2597  s2->first_field ^= 1;
2598  s2->v_edge_pos = 8 * s2->mb_height;
2599  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2600  }
2601  }
2602  if (start_code >= SLICE_MIN_START_CODE &&
2603  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2604  const int field_pic = s2->picture_structure != PICT_FRAME;
2605  int mb_y = start_code - SLICE_MIN_START_CODE;
2606  last_code = SLICE_MIN_START_CODE;
2607  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2608  mb_y += (*buf_ptr&0xE0)<<2;
2609 
2610  mb_y <<= field_pic;
2611  if (s2->picture_structure == PICT_BOTTOM_FIELD)
2612  mb_y++;
2613 
2614  if (buf_end - buf_ptr < 2) {
2615  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2616  return AVERROR_INVALIDDATA;
2617  }
2618 
2619  if (mb_y >= s2->mb_height) {
2620  av_log(s2->avctx, AV_LOG_ERROR,
2621  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2622  return AVERROR_INVALIDDATA;
2623  }
2624 
2625  if (!s2->last_picture_ptr) {
2626  /* Skip B-frames if we do not have reference frames and
2627  * GOP is not closed. */
2628  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2629  if (!s2->closed_gop) {
2630  skip_frame = 1;
2631  break;
2632  }
2633  }
2634  }
2635  if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2636  s->sync = 1;
2637  if (!s2->next_picture_ptr) {
2638  /* Skip P-frames if we do not have a reference frame or
2639  * we have an invalid header. */
2640  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2641  skip_frame = 1;
2642  break;
2643  }
2644  }
2645  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2646  s2->pict_type == AV_PICTURE_TYPE_B) ||
2647  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2648  s2->pict_type != AV_PICTURE_TYPE_I) ||
2649  avctx->skip_frame >= AVDISCARD_ALL) {
2650  skip_frame = 1;
2651  break;
2652  }
2653 
2654  if (!s->mpeg_enc_ctx_allocated)
2655  break;
2656 
2657  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2658  if (mb_y < avctx->skip_top ||
2659  mb_y >= s2->mb_height - avctx->skip_bottom)
2660  break;
2661  }
2662 
2663  if (!s2->pict_type) {
2664  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2665  if (avctx->err_recognition & AV_EF_EXPLODE)
2666  return AVERROR_INVALIDDATA;
2667  break;
2668  }
2669 
2670  if (s->first_slice) {
2671  skip_frame = 0;
2672  s->first_slice = 0;
2673  if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2674  return ret;
2675  }
2676  if (!s2->current_picture_ptr) {
2677  av_log(avctx, AV_LOG_ERROR,
2678  "current_picture not initialized\n");
2679  return AVERROR_INVALIDDATA;
2680  }
2681 
2682  if (uses_vdpau(avctx)) {
2683  s->slice_count++;
2684  break;
2685  }
2686 
2687  if (HAVE_THREADS &&
2688  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2689  !avctx->hwaccel) {
2690  int threshold = (s2->mb_height * s->slice_count +
2691  s2->slice_context_count / 2) /
2692  s2->slice_context_count;
2693  av_assert0(avctx->thread_count > 1);
2694  if (threshold <= mb_y) {
2695  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2696 
2697  thread_context->start_mb_y = mb_y;
2698  thread_context->end_mb_y = s2->mb_height;
2699  if (s->slice_count) {
2700  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2701  ret = ff_update_duplicate_context(thread_context, s2);
2702  if (ret < 0)
2703  return ret;
2704  }
2705  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2706  s->slice_count++;
2707  }
2708  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2709  } else {
2710  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2711  emms_c();
2712 
2713  if (ret < 0) {
2714  if (avctx->err_recognition & AV_EF_EXPLODE)
2715  return ret;
2716  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2717  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2718  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2719  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2720  } else {
2721  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2722  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2723  ER_AC_END | ER_DC_END | ER_MV_END);
2724  }
2725  }
2726  }
2727  break;
2728  }
2729  }
2730 }
2731 
2732 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2733  int *got_output, AVPacket *avpkt)
2734 {
2735  const uint8_t *buf = avpkt->data;
2736  int ret;
2737  int buf_size = avpkt->size;
2738  Mpeg1Context *s = avctx->priv_data;
2739  AVFrame *picture = data;
2740  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2741 
2742  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2743  /* special case for last picture */
2744  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2745  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2746  if (ret < 0)
2747  return ret;
2748 
2749  s2->next_picture_ptr = NULL;
2750 
2751  *got_output = 1;
2752  }
2753  return buf_size;
2754  }
2755 
2756  if (s2->flags & CODEC_FLAG_TRUNCATED) {
2757  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2758  buf_size, NULL);
2759 
2760  if (ff_combine_frame(&s2->parse_context, next,
2761  (const uint8_t **) &buf, &buf_size) < 0)
2762  return buf_size;
2763  }
2764 
2765  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2766  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2767  || s2->codec_tag == AV_RL32("BW10")
2768  ))
2769  vcr2_init_sequence(avctx);
2770 
2771  s->slice_count = 0;
2772 
2773  if (avctx->extradata && !s->extradata_decoded) {
2774  ret = decode_chunks(avctx, picture, got_output,
2775  avctx->extradata, avctx->extradata_size);
2776  if (*got_output) {
2777  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2778  *got_output = 0;
2779  }
2780  s->extradata_decoded = 1;
2781  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2782  s2->current_picture_ptr = NULL;
2783  return ret;
2784  }
2785  }
2786 
2787  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2788  if (ret<0 || *got_output)
2789  s2->current_picture_ptr = NULL;
2790 
2791  return ret;
2792 }
2793 
2794 static void flush(AVCodecContext *avctx)
2795 {
2796  Mpeg1Context *s = avctx->priv_data;
2797 
2798  s->sync = 0;
2799 
2800  ff_mpeg_flush(avctx);
2801 }
2802 
2803 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2804 {
2805  Mpeg1Context *s = avctx->priv_data;
2806 
2807  if (s->mpeg_enc_ctx_allocated)
2808  ff_mpv_common_end(&s->mpeg_enc_ctx);
2809  av_freep(&s->a53_caption);
2810  return 0;
2811 }
2812 
2813 static const AVProfile mpeg2_video_profiles[] = {
2814  { FF_PROFILE_MPEG2_422, "4:2:2" },
2815  { FF_PROFILE_MPEG2_HIGH, "High" },
2816  { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2817  { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2818  { FF_PROFILE_MPEG2_MAIN, "Main" },
2819  { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2820  { FF_PROFILE_RESERVED, "Reserved" },
2821  { FF_PROFILE_RESERVED, "Reserved" },
2822  { FF_PROFILE_UNKNOWN },
2823 };
2824 
2825 AVCodec ff_mpeg1video_decoder = {
2826  .name = "mpeg1video",
2827  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2828  .type = AVMEDIA_TYPE_VIDEO,
2829  .id = AV_CODEC_ID_MPEG1VIDEO,
2830  .priv_data_size = sizeof(Mpeg1Context),
2831  .init = mpeg_decode_init,
2832  .close = mpeg_decode_end,
2833  .decode = mpeg_decode_frame,
2834  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2835  CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2836  CODEC_CAP_SLICE_THREADS,
2837  .flush = flush,
2838  .max_lowres = 3,
2839  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2840 };
2841 
2842 AVCodec ff_mpeg2video_decoder = {
2843  .name = "mpeg2video",
2844  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2845  .type = AVMEDIA_TYPE_VIDEO,
2846  .id = AV_CODEC_ID_MPEG2VIDEO,
2847  .priv_data_size = sizeof(Mpeg1Context),
2848  .init = mpeg_decode_init,
2849  .close = mpeg_decode_end,
2850  .decode = mpeg_decode_frame,
2851  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2852  CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2853  CODEC_CAP_SLICE_THREADS,
2854  .flush = flush,
2855  .max_lowres = 3,
2856  .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2857 };
2858 
2859 //legacy decoder
2860 AVCodec ff_mpegvideo_decoder = {
2861  .name = "mpegvideo",
2862  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2863  .type = AVMEDIA_TYPE_VIDEO,
2864  .id = AV_CODEC_ID_MPEG2VIDEO,
2865  .priv_data_size = sizeof(Mpeg1Context),
2866  .init = mpeg_decode_init,
2867  .close = mpeg_decode_end,
2868  .decode = mpeg_decode_frame,
2869  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2870  .flush = flush,
2871  .max_lowres = 3,
2872 };
2873 
2874 #if FF_API_XVMC
2875 #if CONFIG_MPEG_XVMC_DECODER
2876 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2877 {
2878  if (avctx->active_thread_type & FF_THREAD_SLICE)
2879  return -1;
2880  if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2881  return -1;
2882  if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2883  av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2884  }
2885  mpeg_decode_init(avctx);
2886 
2887  avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2888  avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2889 
2890  return 0;
2891 }
2892 
2893 AVCodec ff_mpeg_xvmc_decoder = {
2894  .name = "mpegvideo_xvmc",
2895  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2896  .type = AVMEDIA_TYPE_VIDEO,
2897  .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2898  .priv_data_size = sizeof(Mpeg1Context),
2899  .init = mpeg_mc_decode_init,
2900  .close = mpeg_decode_end,
2901  .decode = mpeg_decode_frame,
2902  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2903  CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2904  .flush = flush,
2905 };
2906 
2907 #endif
2908 #endif /* FF_API_XVMC */
2909 
2910 #if CONFIG_MPEG_VDPAU_DECODER
2911 AVCodec ff_mpeg_vdpau_decoder = {
2912  .name = "mpegvideo_vdpau",
2913  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2914  .type = AVMEDIA_TYPE_VIDEO,
2915  .id = AV_CODEC_ID_MPEG2VIDEO,
2916  .priv_data_size = sizeof(Mpeg1Context),
2917  .init = mpeg_decode_init,
2918  .close = mpeg_decode_end,
2919  .decode = mpeg_decode_frame,
2920  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2921  CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2922  .flush = flush,
2923 };
2924 #endif
2925 
2926 #if CONFIG_MPEG1_VDPAU_DECODER
2927 AVCodec ff_mpeg1_vdpau_decoder = {
2928  .name = "mpeg1video_vdpau",
2929  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2930  .type = AVMEDIA_TYPE_VIDEO,
2931  .id = AV_CODEC_ID_MPEG1VIDEO,
2932  .priv_data_size = sizeof(Mpeg1Context),
2933  .init = mpeg_decode_init,
2934  .close = mpeg_decode_end,
2935  .decode = mpeg_decode_frame,
2936  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2937  CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2938  .flush = flush,
2939 };
2940 #endif
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