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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  int save_aspect_info;
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 -1;
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 -1;
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 -1;
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 ((s1->mpeg_enc_ctx_allocated == 0) ||
1277  avctx->coded_width != s->width ||
1278  avctx->coded_height != s->height ||
1279  s1->save_width != s->width ||
1280  s1->save_height != s->height ||
1281  s1->save_aspect_info != s->aspect_ratio_info ||
1282  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1283  0) {
1284  if (s1->mpeg_enc_ctx_allocated) {
1285  ParseContext pc = s->parse_context;
1286  s->parse_context.buffer = 0;
1287  ff_mpv_common_end(s);
1288  s->parse_context = pc;
1289  s1->mpeg_enc_ctx_allocated = 0;
1290  }
1291 
1292  if ((s->width == 0) || (s->height == 0))
1293  return -2;
1294 
1295  ret = ff_set_dimensions(avctx, s->width, s->height);
1296  if (ret < 0)
1297  return ret;
1298 
1299  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1300  avctx->rc_max_rate = s->bit_rate;
1301  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1302  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1303  avctx->bit_rate = s->bit_rate;
1304  }
1305  s1->save_aspect_info = s->aspect_ratio_info;
1306  s1->save_width = s->width;
1307  s1->save_height = s->height;
1308  s1->save_progressive_seq = s->progressive_sequence;
1309 
1310  /* low_delay may be forced, in this case we will have B-frames
1311  * that behave like P-frames. */
1312  avctx->has_b_frames = !s->low_delay;
1313 
1314  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1315  // MPEG-1 fps
1316  avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1317  // MPEG-1 aspect
1318  avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1319  avctx->ticks_per_frame = 1;
1320  } else { // MPEG-2
1321  // MPEG-2 fps
1322  av_reduce(&s->avctx->framerate.num,
1323  &s->avctx->framerate.den,
1324  ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1325  ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1326  1 << 30);
1327  avctx->ticks_per_frame = 2;
1328  // MPEG-2 aspect
1329  if (s->aspect_ratio_info > 1) {
1330  AVRational dar =
1331  av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1332  (AVRational) { s1->pan_scan.width,
1333  s1->pan_scan.height }),
1334  (AVRational) { s->width, s->height });
1335 
1336  /* We ignore the spec here and guess a bit as reality does not
1337  * match the spec, see for example res_change_ffmpeg_aspect.ts
1338  * and sequence-display-aspect.mpg.
1339  * issue1613, 621, 562 */
1340  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1341  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1342  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1343  s->avctx->sample_aspect_ratio =
1344  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1345  (AVRational) { s->width, s->height });
1346  } else {
1347  s->avctx->sample_aspect_ratio =
1348  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1349  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1350 // issue1613 4/3 16/9 -> 16/9
1351 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1352 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1353 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1354  av_dlog(avctx, "A %d/%d\n",
1355  ff_mpeg2_aspect[s->aspect_ratio_info].num,
1356  ff_mpeg2_aspect[s->aspect_ratio_info].den);
1357  av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1358  s->avctx->sample_aspect_ratio.den);
1359  }
1360  } else {
1361  s->avctx->sample_aspect_ratio =
1362  ff_mpeg2_aspect[s->aspect_ratio_info];
1363  }
1364  } // MPEG-2
1365 
1366  ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1367 
1368  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1369  setup_hwaccel_for_pixfmt(avctx);
1370 
1371  /* Quantization matrices may need reordering
1372  * if DCT permutation is changed. */
1373  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1374 
1375  ff_mpv_idct_init(s);
1376  if (ff_mpv_common_init(s) < 0)
1377  return -2;
1378 
1379  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1380  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1381  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1382  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1383 
1384  s1->mpeg_enc_ctx_allocated = 1;
1385  }
1386  return 0;
1387 }
1388 
1389 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1390  int buf_size)
1391 {
1392  Mpeg1Context *s1 = avctx->priv_data;
1393  MpegEncContext *s = &s1->mpeg_enc_ctx;
1394  int ref, f_code, vbv_delay;
1395 
1396  init_get_bits(&s->gb, buf, buf_size * 8);
1397 
1398  ref = get_bits(&s->gb, 10); /* temporal ref */
1399  s->pict_type = get_bits(&s->gb, 3);
1400  if (s->pict_type == 0 || s->pict_type > 3)
1401  return AVERROR_INVALIDDATA;
1402 
1403  vbv_delay = get_bits(&s->gb, 16);
1404  s->vbv_delay = vbv_delay;
1405  if (s->pict_type == AV_PICTURE_TYPE_P ||
1406  s->pict_type == AV_PICTURE_TYPE_B) {
1407  s->full_pel[0] = get_bits1(&s->gb);
1408  f_code = get_bits(&s->gb, 3);
1409  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1410  return AVERROR_INVALIDDATA;
1411  f_code += !f_code;
1412  s->mpeg_f_code[0][0] = f_code;
1413  s->mpeg_f_code[0][1] = f_code;
1414  }
1415  if (s->pict_type == AV_PICTURE_TYPE_B) {
1416  s->full_pel[1] = get_bits1(&s->gb);
1417  f_code = get_bits(&s->gb, 3);
1418  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1419  return AVERROR_INVALIDDATA;
1420  f_code += !f_code;
1421  s->mpeg_f_code[1][0] = f_code;
1422  s->mpeg_f_code[1][1] = f_code;
1423  }
1424  s->current_picture.f->pict_type = s->pict_type;
1425  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1426 
1427  if (avctx->debug & FF_DEBUG_PICT_INFO)
1428  av_log(avctx, AV_LOG_DEBUG,
1429  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1430 
1431  s->y_dc_scale = 8;
1432  s->c_dc_scale = 8;
1433  return 0;
1434 }
1435 
1436 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1437 {
1438  MpegEncContext *s = &s1->mpeg_enc_ctx;
1439  int horiz_size_ext, vert_size_ext;
1440  int bit_rate_ext;
1441 
1442  skip_bits(&s->gb, 1); /* profile and level esc*/
1443  s->avctx->profile = get_bits(&s->gb, 3);
1444  s->avctx->level = get_bits(&s->gb, 4);
1445  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1446  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1447  horiz_size_ext = get_bits(&s->gb, 2);
1448  vert_size_ext = get_bits(&s->gb, 2);
1449  s->width |= (horiz_size_ext << 12);
1450  s->height |= (vert_size_ext << 12);
1451  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1452  s->bit_rate += (bit_rate_ext << 18) * 400;
1453  skip_bits1(&s->gb); /* marker */
1454  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1455 
1456  s->low_delay = get_bits1(&s->gb);
1457  if (s->flags & CODEC_FLAG_LOW_DELAY)
1458  s->low_delay = 1;
1459 
1460  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1461  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1462 
1463  av_dlog(s->avctx, "sequence extension\n");
1464  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1465 
1466  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1467  av_log(s->avctx, AV_LOG_DEBUG,
1468  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1469  s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1470  s->avctx->rc_buffer_size, s->bit_rate);
1471 }
1472 
1473 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1474 {
1475  MpegEncContext *s = &s1->mpeg_enc_ctx;
1476  int color_description, w, h;
1477 
1478  skip_bits(&s->gb, 3); /* video format */
1479  color_description = get_bits1(&s->gb);
1480  if (color_description) {
1481  s->avctx->color_primaries = get_bits(&s->gb, 8);
1482  s->avctx->color_trc = get_bits(&s->gb, 8);
1483  s->avctx->colorspace = get_bits(&s->gb, 8);
1484  }
1485  w = get_bits(&s->gb, 14);
1486  skip_bits(&s->gb, 1); // marker
1487  h = get_bits(&s->gb, 14);
1488  // remaining 3 bits are zero padding
1489 
1490  s1->pan_scan.width = 16 * w;
1491  s1->pan_scan.height = 16 * h;
1492 
1493  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1494  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1495 }
1496 
1497 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1498 {
1499  MpegEncContext *s = &s1->mpeg_enc_ctx;
1500  int i, nofco;
1501 
1502  nofco = 1;
1503  if (s->progressive_sequence) {
1504  if (s->repeat_first_field) {
1505  nofco++;
1506  if (s->top_field_first)
1507  nofco++;
1508  }
1509  } else {
1510  if (s->picture_structure == PICT_FRAME) {
1511  nofco++;
1512  if (s->repeat_first_field)
1513  nofco++;
1514  }
1515  }
1516  for (i = 0; i < nofco; i++) {
1517  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1518  skip_bits(&s->gb, 1); // marker
1519  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1520  skip_bits(&s->gb, 1); // marker
1521  }
1522 
1523  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1524  av_log(s->avctx, AV_LOG_DEBUG,
1525  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1526  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1527  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1528  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1529 }
1530 
1531 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1532  uint16_t matrix1[64], int intra)
1533 {
1534  int i;
1535 
1536  for (i = 0; i < 64; i++) {
1537  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1538  int v = get_bits(&s->gb, 8);
1539  if (v == 0) {
1540  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1541  return AVERROR_INVALIDDATA;
1542  }
1543  if (intra && i == 0 && v != 8) {
1544  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1545  v = 8; // needed by pink.mpg / issue1046
1546  }
1547  matrix0[j] = v;
1548  if (matrix1)
1549  matrix1[j] = v;
1550  }
1551  return 0;
1552 }
1553 
1554 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1555 {
1556  av_dlog(s->avctx, "matrix extension\n");
1557 
1558  if (get_bits1(&s->gb))
1559  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1560  if (get_bits1(&s->gb))
1561  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1562  if (get_bits1(&s->gb))
1563  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1564  if (get_bits1(&s->gb))
1565  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1566 }
1567 
1568 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1569 {
1570  MpegEncContext *s = &s1->mpeg_enc_ctx;
1571 
1572  s->full_pel[0] = s->full_pel[1] = 0;
1573  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1574  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1575  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1576  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1577  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1578  av_log(s->avctx, AV_LOG_ERROR,
1579  "Missing picture start code, guessing missing values\n");
1580  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1581  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1582  s->pict_type = AV_PICTURE_TYPE_I;
1583  else
1584  s->pict_type = AV_PICTURE_TYPE_P;
1585  } else
1586  s->pict_type = AV_PICTURE_TYPE_B;
1587  s->current_picture.f->pict_type = s->pict_type;
1588  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1589  }
1590  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1591  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1592  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1593  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1594 
1595  s->intra_dc_precision = get_bits(&s->gb, 2);
1596  s->picture_structure = get_bits(&s->gb, 2);
1597  s->top_field_first = get_bits1(&s->gb);
1598  s->frame_pred_frame_dct = get_bits1(&s->gb);
1599  s->concealment_motion_vectors = get_bits1(&s->gb);
1600  s->q_scale_type = get_bits1(&s->gb);
1601  s->intra_vlc_format = get_bits1(&s->gb);
1602  s->alternate_scan = get_bits1(&s->gb);
1603  s->repeat_first_field = get_bits1(&s->gb);
1604  s->chroma_420_type = get_bits1(&s->gb);
1605  s->progressive_frame = get_bits1(&s->gb);
1606 
1607  if (s->alternate_scan) {
1608  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1609  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1610  } else {
1611  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1612  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1613  }
1614 
1615  /* composite display not parsed */
1616  av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1617  av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1618  av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1619  av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1620  av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1621  av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1622  av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1623  av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1624  av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1625 }
1626 
1627 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1628 {
1629  AVCodecContext *avctx = s->avctx;
1630  Mpeg1Context *s1 = (Mpeg1Context *) s;
1631  int ret;
1632 
1633  /* start frame decoding */
1634  if (s->first_field || s->picture_structure == PICT_FRAME) {
1635  AVFrameSideData *pan_scan;
1636 
1637  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1638  return ret;
1639 
1640  ff_mpeg_er_frame_start(s);
1641 
1642  /* first check if we must repeat the frame */
1643  s->current_picture_ptr->f->repeat_pict = 0;
1644  if (s->repeat_first_field) {
1645  if (s->progressive_sequence) {
1646  if (s->top_field_first)
1647  s->current_picture_ptr->f->repeat_pict = 4;
1648  else
1649  s->current_picture_ptr->f->repeat_pict = 2;
1650  } else if (s->progressive_frame) {
1651  s->current_picture_ptr->f->repeat_pict = 1;
1652  }
1653  }
1654 
1655  pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1656  AV_FRAME_DATA_PANSCAN,
1657  sizeof(s1->pan_scan));
1658  if (!pan_scan)
1659  return AVERROR(ENOMEM);
1660  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1661 
1662  if (s1->a53_caption) {
1663  AVFrameSideData *sd = av_frame_new_side_data(
1664  s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1665  s1->a53_caption_size);
1666  if (sd)
1667  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1668  av_freep(&s1->a53_caption);
1669  }
1670 
1671  if (s1->has_stereo3d) {
1672  AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1673  if (!stereo)
1674  return AVERROR(ENOMEM);
1675 
1676  *stereo = s1->stereo3d;
1677  s1->has_stereo3d = 0;
1678  }
1679 
1680  if (s1->has_afd) {
1681  AVFrameSideData *sd =
1682  av_frame_new_side_data(s->current_picture_ptr->f,
1683  AV_FRAME_DATA_AFD, 1);
1684  if (!sd)
1685  return AVERROR(ENOMEM);
1686 
1687  *sd->data = s1->afd;
1688  s1->has_afd = 0;
1689  }
1690 
1691  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1692  ff_thread_finish_setup(avctx);
1693  } else { // second field
1694  int i;
1695 
1696  if (!s->current_picture_ptr) {
1697  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1698  return -1;
1699  }
1700 
1701  if (s->avctx->hwaccel &&
1702  (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1703  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1704  av_log(avctx, AV_LOG_ERROR,
1705  "hardware accelerator failed to decode first field\n");
1706  }
1707 
1708  for (i = 0; i < 4; i++) {
1709  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1710  if (s->picture_structure == PICT_BOTTOM_FIELD)
1711  s->current_picture.f->data[i] +=
1712  s->current_picture_ptr->f->linesize[i];
1713  }
1714  }
1715 
1716  if (avctx->hwaccel) {
1717  if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1718  return ret;
1719  }
1720 
1721  return 0;
1722 }
1723 
1724 #define DECODE_SLICE_ERROR -1
1725 #define DECODE_SLICE_OK 0
1726 
1727 /**
1728  * Decode a slice.
1729  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1730  * @return DECODE_SLICE_ERROR if the slice is damaged,
1731  * DECODE_SLICE_OK if this slice is OK
1732  */
1733 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1734  const uint8_t **buf, int buf_size)
1735 {
1736  AVCodecContext *avctx = s->avctx;
1737  const int lowres = s->avctx->lowres;
1738  const int field_pic = s->picture_structure != PICT_FRAME;
1739  int ret;
1740 
1741  s->resync_mb_x =
1742  s->resync_mb_y = -1;
1743 
1744  av_assert0(mb_y < s->mb_height);
1745 
1746  init_get_bits(&s->gb, *buf, buf_size * 8);
1747  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1748  skip_bits(&s->gb, 3);
1749 
1750  ff_mpeg1_clean_buffers(s);
1751  s->interlaced_dct = 0;
1752 
1753  s->qscale = get_qscale(s);
1754 
1755  if (s->qscale == 0) {
1756  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1757  return AVERROR_INVALIDDATA;
1758  }
1759 
1760  /* extra slice info */
1761  if (skip_1stop_8data_bits(&s->gb) < 0)
1762  return AVERROR_INVALIDDATA;
1763 
1764  s->mb_x = 0;
1765 
1766  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1767  skip_bits1(&s->gb);
1768  } else {
1769  while (get_bits_left(&s->gb) > 0) {
1770  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1771  MBINCR_VLC_BITS, 2);
1772  if (code < 0) {
1773  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1774  return AVERROR_INVALIDDATA;
1775  }
1776  if (code >= 33) {
1777  if (code == 33)
1778  s->mb_x += 33;
1779  /* otherwise, stuffing, nothing to do */
1780  } else {
1781  s->mb_x += code;
1782  break;
1783  }
1784  }
1785  }
1786 
1787  if (s->mb_x >= (unsigned) s->mb_width) {
1788  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1789  return AVERROR_INVALIDDATA;
1790  }
1791 
1792  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1793  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1794  int start_code = -1;
1795  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1796  if (buf_end < *buf + buf_size)
1797  buf_end -= 4;
1798  s->mb_y = mb_y;
1799  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1800  return DECODE_SLICE_ERROR;
1801  *buf = buf_end;
1802  return DECODE_SLICE_OK;
1803  }
1804 
1805  s->resync_mb_x = s->mb_x;
1806  s->resync_mb_y = s->mb_y = mb_y;
1807  s->mb_skip_run = 0;
1808  ff_init_block_index(s);
1809 
1810  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1811  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1812  av_log(s->avctx, AV_LOG_DEBUG,
1813  "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",
1814  s->qscale,
1815  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1816  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1817  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1818  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1819  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1820  s->progressive_sequence ? "ps" : "",
1821  s->progressive_frame ? "pf" : "",
1822  s->alternate_scan ? "alt" : "",
1823  s->top_field_first ? "top" : "",
1824  s->intra_dc_precision, s->picture_structure,
1825  s->frame_pred_frame_dct, s->concealment_motion_vectors,
1826  s->q_scale_type, s->intra_vlc_format,
1827  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1828  }
1829  }
1830 
1831  for (;;) {
1832  // If 1, we memcpy blocks in xvmcvideo.
1833  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1834  ff_xvmc_init_block(s); // set s->block
1835 
1836  if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1837  return ret;
1838 
1839  // Note motion_val is normally NULL unless we want to extract the MVs.
1840  if (s->current_picture.motion_val[0] && !s->encoding) {
1841  const int wrap = s->b8_stride;
1842  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1843  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1844  int motion_x, motion_y, dir, i;
1845 
1846  for (i = 0; i < 2; i++) {
1847  for (dir = 0; dir < 2; dir++) {
1848  if (s->mb_intra ||
1849  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1850  motion_x = motion_y = 0;
1851  } else if (s->mv_type == MV_TYPE_16X16 ||
1852  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1853  motion_x = s->mv[dir][0][0];
1854  motion_y = s->mv[dir][0][1];
1855  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1856  motion_x = s->mv[dir][i][0];
1857  motion_y = s->mv[dir][i][1];
1858  }
1859 
1860  s->current_picture.motion_val[dir][xy][0] = motion_x;
1861  s->current_picture.motion_val[dir][xy][1] = motion_y;
1862  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1863  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1864  s->current_picture.ref_index [dir][b8_xy] =
1865  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1866  av_assert2(s->field_select[dir][i] == 0 ||
1867  s->field_select[dir][i] == 1);
1868  }
1869  xy += wrap;
1870  b8_xy += 2;
1871  }
1872  }
1873 
1874  s->dest[0] += 16 >> lowres;
1875  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1876  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1877 
1878  ff_mpv_decode_mb(s, s->block);
1879 
1880  if (++s->mb_x >= s->mb_width) {
1881  const int mb_size = 16 >> s->avctx->lowres;
1882 
1883  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1884  ff_mpv_report_decode_progress(s);
1885 
1886  s->mb_x = 0;
1887  s->mb_y += 1 << field_pic;
1888 
1889  if (s->mb_y >= s->mb_height) {
1890  int left = get_bits_left(&s->gb);
1891  int is_d10 = s->chroma_format == 2 &&
1892  s->pict_type == AV_PICTURE_TYPE_I &&
1893  avctx->profile == 0 && avctx->level == 5 &&
1894  s->intra_dc_precision == 2 &&
1895  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1896  s->progressive_frame == 0
1897  /* vbv_delay == 0xBBB || 0xE10 */;
1898 
1899  if (left >= 32 && !is_d10) {
1900  GetBitContext gb = s->gb;
1901  align_get_bits(&gb);
1902  if (show_bits(&gb, 24) == 0x060E2B) {
1903  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1904  is_d10 = 1;
1905  }
1906  }
1907 
1908  if (left < 0 ||
1909  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1910  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1911  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1912  left, show_bits(&s->gb, FFMIN(left, 23)));
1913  return -1;
1914  } else
1915  goto eos;
1916  }
1917  // There are some files out there which are missing the last slice
1918  // in cases where the slice is completely outside the visible
1919  // area, we detect this here instead of running into the end expecting
1920  // more data
1921  if (s->mb_y >= ((s->height + 15) >> 4) &&
1922  s->progressive_frame &&
1923  !s->progressive_sequence &&
1924  get_bits_left(&s->gb) <= 8 &&
1925  get_bits_left(&s->gb) >= 0 &&
1926  s->mb_skip_run == -1 &&
1927  show_bits(&s->gb, 8) == 0)
1928  goto eos;
1929 
1930  ff_init_block_index(s);
1931  }
1932 
1933  /* skip mb handling */
1934  if (s->mb_skip_run == -1) {
1935  /* read increment again */
1936  s->mb_skip_run = 0;
1937  for (;;) {
1938  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1939  MBINCR_VLC_BITS, 2);
1940  if (code < 0) {
1941  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1942  return AVERROR_INVALIDDATA;
1943  }
1944  if (code >= 33) {
1945  if (code == 33) {
1946  s->mb_skip_run += 33;
1947  } else if (code == 35) {
1948  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1949  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1950  return -1;
1951  }
1952  goto eos; /* end of slice */
1953  }
1954  /* otherwise, stuffing, nothing to do */
1955  } else {
1956  s->mb_skip_run += code;
1957  break;
1958  }
1959  }
1960  if (s->mb_skip_run) {
1961  int i;
1962  if (s->pict_type == AV_PICTURE_TYPE_I) {
1963  av_log(s->avctx, AV_LOG_ERROR,
1964  "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1965  return AVERROR_INVALIDDATA;
1966  }
1967 
1968  /* skip mb */
1969  s->mb_intra = 0;
1970  for (i = 0; i < 12; i++)
1971  s->block_last_index[i] = -1;
1972  if (s->picture_structure == PICT_FRAME)
1973  s->mv_type = MV_TYPE_16X16;
1974  else
1975  s->mv_type = MV_TYPE_FIELD;
1976  if (s->pict_type == AV_PICTURE_TYPE_P) {
1977  /* if P type, zero motion vector is implied */
1978  s->mv_dir = MV_DIR_FORWARD;
1979  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1980  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1981  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1982  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1983  } else {
1984  /* if B type, reuse previous vectors and directions */
1985  s->mv[0][0][0] = s->last_mv[0][0][0];
1986  s->mv[0][0][1] = s->last_mv[0][0][1];
1987  s->mv[1][0][0] = s->last_mv[1][0][0];
1988  s->mv[1][0][1] = s->last_mv[1][0][1];
1989  }
1990  }
1991  }
1992  }
1993 eos: // end of slice
1994  if (get_bits_left(&s->gb) < 0) {
1995  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1996  return AVERROR_INVALIDDATA;
1997  }
1998  *buf += (get_bits_count(&s->gb) - 1) / 8;
1999  av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2000  return 0;
2001 }
2002 
2003 static int slice_decode_thread(AVCodecContext *c, void *arg)
2004 {
2005  MpegEncContext *s = *(void **) arg;
2006  const uint8_t *buf = s->gb.buffer;
2007  int mb_y = s->start_mb_y;
2008  const int field_pic = s->picture_structure != PICT_FRAME;
2009 
2010  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2011 
2012  for (;;) {
2013  uint32_t start_code;
2014  int ret;
2015 
2016  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2017  emms_c();
2018  av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2019  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2020  s->start_mb_y, s->end_mb_y, s->er.error_count);
2021  if (ret < 0) {
2022  if (c->err_recognition & AV_EF_EXPLODE)
2023  return ret;
2024  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2025  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2026  s->mb_x, s->mb_y,
2027  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2028  } else {
2029  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2030  s->mb_x - 1, s->mb_y,
2031  ER_AC_END | ER_DC_END | ER_MV_END);
2032  }
2033 
2034  if (s->mb_y == s->end_mb_y)
2035  return 0;
2036 
2037  start_code = -1;
2038  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2039  mb_y = start_code - SLICE_MIN_START_CODE;
2040  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2041  mb_y += (*buf&0xE0)<<2;
2042  mb_y <<= field_pic;
2043  if (s->picture_structure == PICT_BOTTOM_FIELD)
2044  mb_y++;
2045  if (mb_y < 0 || mb_y >= s->end_mb_y)
2046  return -1;
2047  }
2048 }
2049 
2050 /**
2051  * Handle slice ends.
2052  * @return 1 if it seems to be the last slice
2053  */
2054 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2055 {
2056  Mpeg1Context *s1 = avctx->priv_data;
2057  MpegEncContext *s = &s1->mpeg_enc_ctx;
2058 
2059  if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2060  return 0;
2061 
2062  if (s->avctx->hwaccel) {
2063  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2064  av_log(avctx, AV_LOG_ERROR,
2065  "hardware accelerator failed to decode picture\n");
2066  }
2067 
2068  /* end of slice reached */
2069  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2070  /* end of image */
2071 
2072  ff_er_frame_end(&s->er);
2073 
2074  ff_mpv_frame_end(s);
2075 
2076  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2077  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2078  if (ret < 0)
2079  return ret;
2080  ff_print_debug_info(s, s->current_picture_ptr, pict);
2081  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2082  } else {
2083  if (avctx->active_thread_type & FF_THREAD_FRAME)
2084  s->picture_number++;
2085  /* latency of 1 frame for I- and P-frames */
2086  /* XXX: use another variable than picture_number */
2087  if (s->last_picture_ptr) {
2088  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2089  if (ret < 0)
2090  return ret;
2091  ff_print_debug_info(s, s->last_picture_ptr, pict);
2092  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2093  }
2094  }
2095 
2096  return 1;
2097  } else {
2098  return 0;
2099  }
2100 }
2101 
2102 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2103  const uint8_t *buf, int buf_size)
2104 {
2105  Mpeg1Context *s1 = avctx->priv_data;
2106  MpegEncContext *s = &s1->mpeg_enc_ctx;
2107  int width, height;
2108  int i, v, j;
2109 
2110  init_get_bits(&s->gb, buf, buf_size * 8);
2111 
2112  width = get_bits(&s->gb, 12);
2113  height = get_bits(&s->gb, 12);
2114  if (width == 0 || height == 0) {
2115  av_log(avctx, AV_LOG_WARNING,
2116  "Invalid horizontal or vertical size value.\n");
2117  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2118  return AVERROR_INVALIDDATA;
2119  }
2120  s->aspect_ratio_info = get_bits(&s->gb, 4);
2121  if (s->aspect_ratio_info == 0) {
2122  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2123  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2124  return AVERROR_INVALIDDATA;
2125  }
2126  s->frame_rate_index = get_bits(&s->gb, 4);
2127  if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2128  av_log(avctx, AV_LOG_WARNING, "frame_rate_index %d is invalid\n", s->frame_rate_index);
2129  s->frame_rate_index = 1;
2130  }
2131  s->bit_rate = get_bits(&s->gb, 18) * 400;
2132  if (get_bits1(&s->gb) == 0) { /* marker */
2133  av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2134  return AVERROR_INVALIDDATA;
2135  }
2136  s->width = width;
2137  s->height = height;
2138 
2139  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2140  skip_bits(&s->gb, 1);
2141 
2142  /* get matrix */
2143  if (get_bits1(&s->gb)) {
2144  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2145  } else {
2146  for (i = 0; i < 64; i++) {
2147  j = s->idsp.idct_permutation[i];
2148  v = ff_mpeg1_default_intra_matrix[i];
2149  s->intra_matrix[j] = v;
2150  s->chroma_intra_matrix[j] = v;
2151  }
2152  }
2153  if (get_bits1(&s->gb)) {
2154  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2155  } else {
2156  for (i = 0; i < 64; i++) {
2157  int j = s->idsp.idct_permutation[i];
2158  v = ff_mpeg1_default_non_intra_matrix[i];
2159  s->inter_matrix[j] = v;
2160  s->chroma_inter_matrix[j] = v;
2161  }
2162  }
2163 
2164  if (show_bits(&s->gb, 23) != 0) {
2165  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2166  return AVERROR_INVALIDDATA;
2167  }
2168 
2169  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2170  s->progressive_sequence = 1;
2171  s->progressive_frame = 1;
2172  s->picture_structure = PICT_FRAME;
2173  s->first_field = 0;
2174  s->frame_pred_frame_dct = 1;
2175  s->chroma_format = 1;
2176  s->codec_id =
2177  s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2178  s->out_format = FMT_MPEG1;
2179  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2180  if (s->flags & CODEC_FLAG_LOW_DELAY)
2181  s->low_delay = 1;
2182 
2183  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2184  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2185  s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2186 
2187  return 0;
2188 }
2189 
2190 static int vcr2_init_sequence(AVCodecContext *avctx)
2191 {
2192  Mpeg1Context *s1 = avctx->priv_data;
2193  MpegEncContext *s = &s1->mpeg_enc_ctx;
2194  int i, v;
2195  int ret;
2196 
2197  /* start new MPEG-1 context decoding */
2198  s->out_format = FMT_MPEG1;
2199  if (s1->mpeg_enc_ctx_allocated) {
2200  ff_mpv_common_end(s);
2201  s1->mpeg_enc_ctx_allocated = 0;
2202  }
2203  s->width = avctx->coded_width;
2204  s->height = avctx->coded_height;
2205  avctx->has_b_frames = 0; // true?
2206  s->low_delay = 1;
2207 
2208  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2209  setup_hwaccel_for_pixfmt(avctx);
2210 
2211  ff_mpv_idct_init(s);
2212  if ((ret = ff_mpv_common_init(s)) < 0)
2213  return ret;
2214  s1->mpeg_enc_ctx_allocated = 1;
2215 
2216  for (i = 0; i < 64; i++) {
2217  int j = s->idsp.idct_permutation[i];
2218  v = ff_mpeg1_default_intra_matrix[i];
2219  s->intra_matrix[j] = v;
2220  s->chroma_intra_matrix[j] = v;
2221 
2222  v = ff_mpeg1_default_non_intra_matrix[i];
2223  s->inter_matrix[j] = v;
2224  s->chroma_inter_matrix[j] = v;
2225  }
2226 
2227  s->progressive_sequence = 1;
2228  s->progressive_frame = 1;
2229  s->picture_structure = PICT_FRAME;
2230  s->first_field = 0;
2231  s->frame_pred_frame_dct = 1;
2232  s->chroma_format = 1;
2233  if (s->codec_tag == AV_RL32("BW10")) {
2234  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2235  } else {
2236  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2237  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2238  }
2239  s1->save_width = s->width;
2240  s1->save_height = s->height;
2241  s1->save_progressive_seq = s->progressive_sequence;
2242  return 0;
2243 }
2244 
2245 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2246  const uint8_t *p, int buf_size)
2247 {
2248  Mpeg1Context *s1 = avctx->priv_data;
2249 
2250  if (buf_size >= 6 &&
2251  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2252  p[4] == 3 && (p[5] & 0x40)) {
2253  /* extract A53 Part 4 CC data */
2254  int cc_count = p[5] & 0x1f;
2255  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2256  av_freep(&s1->a53_caption);
2257  s1->a53_caption_size = cc_count * 3;
2258  s1->a53_caption = av_malloc(s1->a53_caption_size);
2259  if (s1->a53_caption)
2260  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2261  }
2262  return 1;
2263  } else if (buf_size >= 11 &&
2264  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2265  /* extract DVD CC data */
2266  int cc_count = 0;
2267  int i;
2268  // There is a caption count field in the data, but it is often
2269  // incorect. So count the number of captions present.
2270  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2271  cc_count++;
2272  // Transform the DVD format into A53 Part 4 format
2273  if (cc_count > 0) {
2274  av_freep(&s1->a53_caption);
2275  s1->a53_caption_size = cc_count * 6;
2276  s1->a53_caption = av_malloc(s1->a53_caption_size);
2277  if (s1->a53_caption) {
2278  uint8_t field1 = !!(p[4] & 0x80);
2279  uint8_t *cap = s1->a53_caption;
2280  p += 5;
2281  for (i = 0; i < cc_count; i++) {
2282  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2283  cap[1] = p[1];
2284  cap[2] = p[2];
2285  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2286  cap[4] = p[4];
2287  cap[5] = p[5];
2288  cap += 6;
2289  p += 6;
2290  }
2291  }
2292  }
2293  return 1;
2294  }
2295  return 0;
2296 }
2297 
2298 static void mpeg_decode_user_data(AVCodecContext *avctx,
2299  const uint8_t *p, int buf_size)
2300 {
2301  Mpeg1Context *s = avctx->priv_data;
2302  const uint8_t *buf_end = p + buf_size;
2303  Mpeg1Context *s1 = avctx->priv_data;
2304 
2305  if (buf_size > 29){
2306  int i;
2307  for(i=0; i<20; i++)
2308  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2309  s->tmpgexs= 1;
2310  }
2311 
2312 /* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2313  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2314  }
2315  av_log(avctx, AV_LOG_ERROR, "\n");*/
2316  }
2317 
2318  /* we parse the DTG active format information */
2319  if (buf_end - p >= 5 &&
2320  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2321  int flags = p[4];
2322  p += 5;
2323  if (flags & 0x80) {
2324  /* skip event id */
2325  p += 2;
2326  }
2327  if (flags & 0x40) {
2328  if (buf_end - p < 1)
2329  return;
2330 #if FF_API_AFD
2331 FF_DISABLE_DEPRECATION_WARNINGS
2332  avctx->dtg_active_format = p[0] & 0x0f;
2333 FF_ENABLE_DEPRECATION_WARNINGS
2334 #endif /* FF_API_AFD */
2335  s1->has_afd = 1;
2336  s1->afd = p[0] & 0x0f;
2337  }
2338  } else if (buf_end - p >= 6 &&
2339  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2340  p[4] == 0x03) { // S3D_video_format_length
2341  // the 0x7F mask ignores the reserved_bit value
2342  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2343 
2344  if (S3D_video_format_type == 0x03 ||
2345  S3D_video_format_type == 0x04 ||
2346  S3D_video_format_type == 0x08 ||
2347  S3D_video_format_type == 0x23) {
2348 
2349  s1->has_stereo3d = 1;
2350 
2351  switch (S3D_video_format_type) {
2352  case 0x03:
2353  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2354  break;
2355  case 0x04:
2356  s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2357  break;
2358  case 0x08:
2359  s1->stereo3d.type = AV_STEREO3D_2D;
2360  break;
2361  case 0x23:
2362  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2363  break;
2364  }
2365  }
2366  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2367  return;
2368  }
2369 }
2370 
2371 static void mpeg_decode_gop(AVCodecContext *avctx,
2372  const uint8_t *buf, int buf_size)
2373 {
2374  Mpeg1Context *s1 = avctx->priv_data;
2375  MpegEncContext *s = &s1->mpeg_enc_ctx;
2376  int broken_link;
2377  int64_t tc;
2378 
2379  init_get_bits(&s->gb, buf, buf_size * 8);
2380 
2381  tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2382 
2383  s->closed_gop = get_bits1(&s->gb);
2384  /* broken_link indicate that after editing the
2385  * reference frames of the first B-Frames after GOP I-Frame
2386  * are missing (open gop) */
2387  broken_link = get_bits1(&s->gb);
2388 
2389  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2390  char tcbuf[AV_TIMECODE_STR_SIZE];
2391  av_timecode_make_mpeg_tc_string(tcbuf, tc);
2392  av_log(s->avctx, AV_LOG_DEBUG,
2393  "GOP (%s) closed_gop=%d broken_link=%d\n",
2394  tcbuf, s->closed_gop, broken_link);
2395  }
2396 }
2397 
2398 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2399  int *got_output, const uint8_t *buf, int buf_size)
2400 {
2401  Mpeg1Context *s = avctx->priv_data;
2402  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2403  const uint8_t *buf_ptr = buf;
2404  const uint8_t *buf_end = buf + buf_size;
2405  int ret, input_size;
2406  int last_code = 0, skip_frame = 0;
2407  int picture_start_code_seen = 0;
2408 
2409  for (;;) {
2410  /* find next start code */
2411  uint32_t start_code = -1;
2412  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2413  if (start_code > 0x1ff) {
2414  if (!skip_frame) {
2415  if (HAVE_THREADS &&
2416  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2417  !avctx->hwaccel) {
2418  int i;
2419  av_assert0(avctx->thread_count > 1);
2420 
2421  avctx->execute(avctx, slice_decode_thread,
2422  &s2->thread_context[0], NULL,
2423  s->slice_count, sizeof(void *));
2424  for (i = 0; i < s->slice_count; i++)
2425  s2->er.error_count += s2->thread_context[i]->er.error_count;
2426  }
2427 
2428  if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2429  && uses_vdpau(avctx))
2430  ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2431 
2432  ret = slice_end(avctx, picture);
2433  if (ret < 0)
2434  return ret;
2435  else if (ret) {
2436  // FIXME: merge with the stuff in mpeg_decode_slice
2437  if (s2->last_picture_ptr || s2->low_delay)
2438  *got_output = 1;
2439  }
2440  }
2441  s2->pict_type = 0;
2442 
2443  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2444  return AVERROR_INVALIDDATA;
2445 
2446  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2447  }
2448 
2449  input_size = buf_end - buf_ptr;
2450 
2451  if (avctx->debug & FF_DEBUG_STARTCODE)
2452  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2453  start_code, buf_ptr - buf, input_size);
2454 
2455  /* prepare data for next start code */
2456  switch (start_code) {
2457  case SEQ_START_CODE:
2458  if (last_code == 0) {
2459  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2460  if (buf != avctx->extradata)
2461  s->sync = 1;
2462  } else {
2463  av_log(avctx, AV_LOG_ERROR,
2464  "ignoring SEQ_START_CODE after %X\n", last_code);
2465  if (avctx->err_recognition & AV_EF_EXPLODE)
2466  return AVERROR_INVALIDDATA;
2467  }
2468  break;
2469 
2470  case PICTURE_START_CODE:
2471  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2472  /* If it's a frame picture, there can't be more than one picture header.
2473  Yet, it does happen and we need to handle it. */
2474  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2475  break;
2476  }
2477  picture_start_code_seen = 1;
2478 
2479  if (s2->width <= 0 || s2->height <= 0) {
2480  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2481  s2->width, s2->height);
2482  return AVERROR_INVALIDDATA;
2483  }
2484 
2485  if (s->tmpgexs){
2486  s2->intra_dc_precision= 3;
2487  s2->intra_matrix[0]= 1;
2488  }
2489  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2490  !avctx->hwaccel && s->slice_count) {
2491  int i;
2492 
2493  avctx->execute(avctx, slice_decode_thread,
2494  s2->thread_context, NULL,
2495  s->slice_count, sizeof(void *));
2496  for (i = 0; i < s->slice_count; i++)
2497  s2->er.error_count += s2->thread_context[i]->er.error_count;
2498  s->slice_count = 0;
2499  }
2500  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2501  ret = mpeg_decode_postinit(avctx);
2502  if (ret < 0) {
2503  av_log(avctx, AV_LOG_ERROR,
2504  "mpeg_decode_postinit() failure\n");
2505  return ret;
2506  }
2507 
2508  /* We have a complete image: we try to decompress it. */
2509  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2510  s2->pict_type = 0;
2511  s->first_slice = 1;
2512  last_code = PICTURE_START_CODE;
2513  } else {
2514  av_log(avctx, AV_LOG_ERROR,
2515  "ignoring pic after %X\n", last_code);
2516  if (avctx->err_recognition & AV_EF_EXPLODE)
2517  return AVERROR_INVALIDDATA;
2518  }
2519  break;
2520  case EXT_START_CODE:
2521  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2522 
2523  switch (get_bits(&s2->gb, 4)) {
2524  case 0x1:
2525  if (last_code == 0) {
2526  mpeg_decode_sequence_extension(s);
2527  } else {
2528  av_log(avctx, AV_LOG_ERROR,
2529  "ignoring seq ext after %X\n", last_code);
2530  if (avctx->err_recognition & AV_EF_EXPLODE)
2531  return AVERROR_INVALIDDATA;
2532  }
2533  break;
2534  case 0x2:
2535  mpeg_decode_sequence_display_extension(s);
2536  break;
2537  case 0x3:
2538  mpeg_decode_quant_matrix_extension(s2);
2539  break;
2540  case 0x7:
2541  mpeg_decode_picture_display_extension(s);
2542  break;
2543  case 0x8:
2544  if (last_code == PICTURE_START_CODE) {
2545  mpeg_decode_picture_coding_extension(s);
2546  } else {
2547  av_log(avctx, AV_LOG_ERROR,
2548  "ignoring pic cod ext after %X\n", last_code);
2549  if (avctx->err_recognition & AV_EF_EXPLODE)
2550  return AVERROR_INVALIDDATA;
2551  }
2552  break;
2553  }
2554  break;
2555  case USER_START_CODE:
2556  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2557  break;
2558  case GOP_START_CODE:
2559  if (last_code == 0) {
2560  s2->first_field = 0;
2561  mpeg_decode_gop(avctx, buf_ptr, input_size);
2562  s->sync = 1;
2563  } else {
2564  av_log(avctx, AV_LOG_ERROR,
2565  "ignoring GOP_START_CODE after %X\n", last_code);
2566  if (avctx->err_recognition & AV_EF_EXPLODE)
2567  return AVERROR_INVALIDDATA;
2568  }
2569  break;
2570  default:
2571  if (start_code >= SLICE_MIN_START_CODE &&
2572  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2573  if (s2->progressive_sequence && !s2->progressive_frame) {
2574  s2->progressive_frame = 1;
2575  av_log(s2->avctx, AV_LOG_ERROR,
2576  "interlaced frame in progressive sequence, ignoring\n");
2577  }
2578 
2579  if (s2->picture_structure == 0 ||
2580  (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2581  av_log(s2->avctx, AV_LOG_ERROR,
2582  "picture_structure %d invalid, ignoring\n",
2583  s2->picture_structure);
2584  s2->picture_structure = PICT_FRAME;
2585  }
2586 
2587  if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2588  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2589 
2590  if (s2->picture_structure == PICT_FRAME) {
2591  s2->first_field = 0;
2592  s2->v_edge_pos = 16 * s2->mb_height;
2593  } else {
2594  s2->first_field ^= 1;
2595  s2->v_edge_pos = 8 * s2->mb_height;
2596  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2597  }
2598  }
2599  if (start_code >= SLICE_MIN_START_CODE &&
2600  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2601  const int field_pic = s2->picture_structure != PICT_FRAME;
2602  int mb_y = start_code - SLICE_MIN_START_CODE;
2603  last_code = SLICE_MIN_START_CODE;
2604  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2605  mb_y += (*buf_ptr&0xE0)<<2;
2606 
2607  mb_y <<= field_pic;
2608  if (s2->picture_structure == PICT_BOTTOM_FIELD)
2609  mb_y++;
2610 
2611  if (buf_end - buf_ptr < 2) {
2612  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2613  return AVERROR_INVALIDDATA;
2614  }
2615 
2616  if (mb_y >= s2->mb_height) {
2617  av_log(s2->avctx, AV_LOG_ERROR,
2618  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2619  return AVERROR_INVALIDDATA;
2620  }
2621 
2622  if (!s2->last_picture_ptr) {
2623  /* Skip B-frames if we do not have reference frames and
2624  * GOP is not closed. */
2625  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2626  if (!s2->closed_gop) {
2627  skip_frame = 1;
2628  break;
2629  }
2630  }
2631  }
2632  if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2633  s->sync = 1;
2634  if (!s2->next_picture_ptr) {
2635  /* Skip P-frames if we do not have a reference frame or
2636  * we have an invalid header. */
2637  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2638  skip_frame = 1;
2639  break;
2640  }
2641  }
2642  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2643  s2->pict_type == AV_PICTURE_TYPE_B) ||
2644  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2645  s2->pict_type != AV_PICTURE_TYPE_I) ||
2646  avctx->skip_frame >= AVDISCARD_ALL) {
2647  skip_frame = 1;
2648  break;
2649  }
2650 
2651  if (!s->mpeg_enc_ctx_allocated)
2652  break;
2653 
2654  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2655  if (mb_y < avctx->skip_top ||
2656  mb_y >= s2->mb_height - avctx->skip_bottom)
2657  break;
2658  }
2659 
2660  if (!s2->pict_type) {
2661  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2662  if (avctx->err_recognition & AV_EF_EXPLODE)
2663  return AVERROR_INVALIDDATA;
2664  break;
2665  }
2666 
2667  if (s->first_slice) {
2668  skip_frame = 0;
2669  s->first_slice = 0;
2670  if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2671  return ret;
2672  }
2673  if (!s2->current_picture_ptr) {
2674  av_log(avctx, AV_LOG_ERROR,
2675  "current_picture not initialized\n");
2676  return AVERROR_INVALIDDATA;
2677  }
2678 
2679  if (uses_vdpau(avctx)) {
2680  s->slice_count++;
2681  break;
2682  }
2683 
2684  if (HAVE_THREADS &&
2685  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2686  !avctx->hwaccel) {
2687  int threshold = (s2->mb_height * s->slice_count +
2688  s2->slice_context_count / 2) /
2689  s2->slice_context_count;
2690  av_assert0(avctx->thread_count > 1);
2691  if (threshold <= mb_y) {
2692  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2693 
2694  thread_context->start_mb_y = mb_y;
2695  thread_context->end_mb_y = s2->mb_height;
2696  if (s->slice_count) {
2697  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2698  ret = ff_update_duplicate_context(thread_context, s2);
2699  if (ret < 0)
2700  return ret;
2701  }
2702  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2703  s->slice_count++;
2704  }
2705  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2706  } else {
2707  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2708  emms_c();
2709 
2710  if (ret < 0) {
2711  if (avctx->err_recognition & AV_EF_EXPLODE)
2712  return ret;
2713  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2714  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2715  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2716  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2717  } else {
2718  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2719  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2720  ER_AC_END | ER_DC_END | ER_MV_END);
2721  }
2722  }
2723  }
2724  break;
2725  }
2726  }
2727 }
2728 
2729 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2730  int *got_output, AVPacket *avpkt)
2731 {
2732  const uint8_t *buf = avpkt->data;
2733  int ret;
2734  int buf_size = avpkt->size;
2735  Mpeg1Context *s = avctx->priv_data;
2736  AVFrame *picture = data;
2737  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2738 
2739  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2740  /* special case for last picture */
2741  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2742  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2743  if (ret < 0)
2744  return ret;
2745 
2746  s2->next_picture_ptr = NULL;
2747 
2748  *got_output = 1;
2749  }
2750  return buf_size;
2751  }
2752 
2753  if (s2->flags & CODEC_FLAG_TRUNCATED) {
2754  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2755  buf_size, NULL);
2756 
2757  if (ff_combine_frame(&s2->parse_context, next,
2758  (const uint8_t **) &buf, &buf_size) < 0)
2759  return buf_size;
2760  }
2761 
2762  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2763  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2764  || s2->codec_tag == AV_RL32("BW10")
2765  ))
2766  vcr2_init_sequence(avctx);
2767 
2768  s->slice_count = 0;
2769 
2770  if (avctx->extradata && !s->extradata_decoded) {
2771  ret = decode_chunks(avctx, picture, got_output,
2772  avctx->extradata, avctx->extradata_size);
2773  if (*got_output) {
2774  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2775  *got_output = 0;
2776  }
2777  s->extradata_decoded = 1;
2778  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2779  s2->current_picture_ptr = NULL;
2780  return ret;
2781  }
2782  }
2783 
2784  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2785  if (ret<0 || *got_output)
2786  s2->current_picture_ptr = NULL;
2787 
2788  return ret;
2789 }
2790 
2791 static void flush(AVCodecContext *avctx)
2792 {
2793  Mpeg1Context *s = avctx->priv_data;
2794 
2795  s->sync = 0;
2796 
2797  ff_mpeg_flush(avctx);
2798 }
2799 
2800 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2801 {
2802  Mpeg1Context *s = avctx->priv_data;
2803 
2804  if (s->mpeg_enc_ctx_allocated)
2805  ff_mpv_common_end(&s->mpeg_enc_ctx);
2806  av_freep(&s->a53_caption);
2807  return 0;
2808 }
2809 
2810 static const AVProfile mpeg2_video_profiles[] = {
2811  { FF_PROFILE_MPEG2_422, "4:2:2" },
2812  { FF_PROFILE_MPEG2_HIGH, "High" },
2813  { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2814  { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2815  { FF_PROFILE_MPEG2_MAIN, "Main" },
2816  { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2817  { FF_PROFILE_RESERVED, "Reserved" },
2818  { FF_PROFILE_RESERVED, "Reserved" },
2819  { FF_PROFILE_UNKNOWN },
2820 };
2821 
2822 AVCodec ff_mpeg1video_decoder = {
2823  .name = "mpeg1video",
2824  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2825  .type = AVMEDIA_TYPE_VIDEO,
2826  .id = AV_CODEC_ID_MPEG1VIDEO,
2827  .priv_data_size = sizeof(Mpeg1Context),
2828  .init = mpeg_decode_init,
2829  .close = mpeg_decode_end,
2830  .decode = mpeg_decode_frame,
2831  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2832  CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2833  CODEC_CAP_SLICE_THREADS,
2834  .flush = flush,
2835  .max_lowres = 3,
2836  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2837 };
2838 
2839 AVCodec ff_mpeg2video_decoder = {
2840  .name = "mpeg2video",
2841  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2842  .type = AVMEDIA_TYPE_VIDEO,
2843  .id = AV_CODEC_ID_MPEG2VIDEO,
2844  .priv_data_size = sizeof(Mpeg1Context),
2845  .init = mpeg_decode_init,
2846  .close = mpeg_decode_end,
2847  .decode = mpeg_decode_frame,
2848  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2849  CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2850  CODEC_CAP_SLICE_THREADS,
2851  .flush = flush,
2852  .max_lowres = 3,
2853  .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2854 };
2855 
2856 //legacy decoder
2857 AVCodec ff_mpegvideo_decoder = {
2858  .name = "mpegvideo",
2859  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2860  .type = AVMEDIA_TYPE_VIDEO,
2861  .id = AV_CODEC_ID_MPEG2VIDEO,
2862  .priv_data_size = sizeof(Mpeg1Context),
2863  .init = mpeg_decode_init,
2864  .close = mpeg_decode_end,
2865  .decode = mpeg_decode_frame,
2866  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2867  .flush = flush,
2868  .max_lowres = 3,
2869 };
2870 
2871 #if FF_API_XVMC
2872 #if CONFIG_MPEG_XVMC_DECODER
2873 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2874 {
2875  if (avctx->active_thread_type & FF_THREAD_SLICE)
2876  return -1;
2877  if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2878  return -1;
2879  if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2880  av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2881  }
2882  mpeg_decode_init(avctx);
2883 
2884  avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2885  avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2886 
2887  return 0;
2888 }
2889 
2890 AVCodec ff_mpeg_xvmc_decoder = {
2891  .name = "mpegvideo_xvmc",
2892  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2893  .type = AVMEDIA_TYPE_VIDEO,
2894  .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2895  .priv_data_size = sizeof(Mpeg1Context),
2896  .init = mpeg_mc_decode_init,
2897  .close = mpeg_decode_end,
2898  .decode = mpeg_decode_frame,
2899  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2900  CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2901  .flush = flush,
2902 };
2903 
2904 #endif
2905 #endif /* FF_API_XVMC */
2906 
2907 #if CONFIG_MPEG_VDPAU_DECODER
2908 AVCodec ff_mpeg_vdpau_decoder = {
2909  .name = "mpegvideo_vdpau",
2910  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2911  .type = AVMEDIA_TYPE_VIDEO,
2912  .id = AV_CODEC_ID_MPEG2VIDEO,
2913  .priv_data_size = sizeof(Mpeg1Context),
2914  .init = mpeg_decode_init,
2915  .close = mpeg_decode_end,
2916  .decode = mpeg_decode_frame,
2917  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2918  CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2919  .flush = flush,
2920 };
2921 #endif
2922 
2923 #if CONFIG_MPEG1_VDPAU_DECODER
2924 AVCodec ff_mpeg1_vdpau_decoder = {
2925  .name = "mpeg1video_vdpau",
2926  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2927  .type = AVMEDIA_TYPE_VIDEO,
2928  .id = AV_CODEC_ID_MPEG1VIDEO,
2929  .priv_data_size = sizeof(Mpeg1Context),
2930  .init = mpeg_decode_init,
2931  .close = mpeg_decode_end,
2932  .decode = mpeg_decode_frame,
2933  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2934  CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2935  .flush = flush,
2936 };
2937 #endif
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