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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  int slice_count;
60  int save_aspect_info;
61  int save_width, save_height, save_progressive_seq;
62  AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
63  int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
64  int tmpgexs;
65  int first_slice;
66  int extradata_decoded;
67 } Mpeg1Context;
68 
69 #define MB_TYPE_ZERO_MV 0x20000000
70 
71 static const uint32_t ptype2mb_type[7] = {
72  MB_TYPE_INTRA,
73  MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
74  MB_TYPE_L0,
75  MB_TYPE_L0 | MB_TYPE_CBP,
76  MB_TYPE_QUANT | MB_TYPE_INTRA,
77  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
78  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
79 };
80 
81 static const uint32_t btype2mb_type[11] = {
82  MB_TYPE_INTRA,
83  MB_TYPE_L1,
84  MB_TYPE_L1 | MB_TYPE_CBP,
85  MB_TYPE_L0,
86  MB_TYPE_L0 | MB_TYPE_CBP,
87  MB_TYPE_L0L1,
88  MB_TYPE_L0L1 | MB_TYPE_CBP,
89  MB_TYPE_QUANT | MB_TYPE_INTRA,
90  MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
91  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
92  MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
93 };
94 
95 static const uint8_t non_linear_qscale[32] = {
96  0, 1, 2, 3, 4, 5, 6, 7,
97  8, 10, 12, 14, 16, 18, 20, 22,
98  24, 28, 32, 36, 40, 44, 48, 52,
99  56, 64, 72, 80, 88, 96, 104, 112,
100 };
101 
102 /* as H.263, but only 17 codes */
103 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
104 {
105  int code, sign, val, shift;
106 
107  code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
108  if (code == 0)
109  return pred;
110  if (code < 0)
111  return 0xffff;
112 
113  sign = get_bits1(&s->gb);
114  shift = fcode - 1;
115  val = code;
116  if (shift) {
117  val = (val - 1) << shift;
118  val |= get_bits(&s->gb, shift);
119  val++;
120  }
121  if (sign)
122  val = -val;
123  val += pred;
124 
125  /* modulo decoding */
126  return sign_extend(val, 5 + shift);
127 }
128 
129 #define check_scantable_index(ctx, x) \
130  do { \
131  if ((x) > 63) { \
132  av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
133  ctx->mb_x, ctx->mb_y); \
134  return AVERROR_INVALIDDATA; \
135  } \
136  } while (0)
137 
138 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
139  int16_t *block, int n)
140 {
141  int level, dc, diff, i, j, run;
142  int component;
143  RLTable *rl = &ff_rl_mpeg1;
144  uint8_t *const scantable = s->intra_scantable.permutated;
145  const uint16_t *quant_matrix = s->intra_matrix;
146  const int qscale = s->qscale;
147 
148  /* DC coefficient */
149  component = (n <= 3 ? 0 : n - 4 + 1);
150  diff = decode_dc(&s->gb, component);
151  if (diff >= 0xffff)
152  return -1;
153  dc = s->last_dc[component];
154  dc += diff;
155  s->last_dc[component] = dc;
156  block[0] = dc * quant_matrix[0];
157  av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
158  i = 0;
159  {
160  OPEN_READER(re, &s->gb);
161  UPDATE_CACHE(re, &s->gb);
162  if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
163  goto end;
164 
165  /* now quantify & encode AC coefficients */
166  for (;;) {
167  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
168  TEX_VLC_BITS, 2, 0);
169 
170  if (level != 0) {
171  i += run;
172  check_scantable_index(s, i);
173  j = scantable[i];
174  level = (level * qscale * quant_matrix[j]) >> 4;
175  level = (level - 1) | 1;
176  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
177  SHOW_SBITS(re, &s->gb, 1);
178  SKIP_BITS(re, &s->gb, 1);
179  } else {
180  /* escape */
181  run = SHOW_UBITS(re, &s->gb, 6) + 1;
182  LAST_SKIP_BITS(re, &s->gb, 6);
183  UPDATE_CACHE(re, &s->gb);
184  level = SHOW_SBITS(re, &s->gb, 8);
185  SKIP_BITS(re, &s->gb, 8);
186  if (level == -128) {
187  level = SHOW_UBITS(re, &s->gb, 8) - 256;
188  SKIP_BITS(re, &s->gb, 8);
189  } else if (level == 0) {
190  level = SHOW_UBITS(re, &s->gb, 8);
191  SKIP_BITS(re, &s->gb, 8);
192  }
193  i += run;
194  check_scantable_index(s, i);
195  j = scantable[i];
196  if (level < 0) {
197  level = -level;
198  level = (level * qscale * quant_matrix[j]) >> 4;
199  level = (level - 1) | 1;
200  level = -level;
201  } else {
202  level = (level * qscale * quant_matrix[j]) >> 4;
203  level = (level - 1) | 1;
204  }
205  }
206 
207  block[j] = level;
208  if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
209  break;
210 
211  UPDATE_CACHE(re, &s->gb);
212  }
213 end:
214  LAST_SKIP_BITS(re, &s->gb, 2);
215  CLOSE_READER(re, &s->gb);
216  }
217  s->block_last_index[n] = i;
218  return 0;
219 }
220 
221 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
222 {
223  return mpeg1_decode_block_intra(s, block, n);
224 }
225 
226 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
227  int16_t *block, int n)
228 {
229  int level, i, j, run;
230  RLTable *rl = &ff_rl_mpeg1;
231  uint8_t *const scantable = s->intra_scantable.permutated;
232  const uint16_t *quant_matrix = s->inter_matrix;
233  const int qscale = s->qscale;
234 
235  {
236  OPEN_READER(re, &s->gb);
237  i = -1;
238  // special case for first coefficient, no need to add second VLC table
239  UPDATE_CACHE(re, &s->gb);
240  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
241  level = (3 * qscale * quant_matrix[0]) >> 5;
242  level = (level - 1) | 1;
243  if (GET_CACHE(re, &s->gb) & 0x40000000)
244  level = -level;
245  block[0] = level;
246  i++;
247  SKIP_BITS(re, &s->gb, 2);
248  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
249  goto end;
250  }
251  /* now quantify & encode AC coefficients */
252  for (;;) {
253  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
254  TEX_VLC_BITS, 2, 0);
255 
256  if (level != 0) {
257  i += run;
258  check_scantable_index(s, i);
259  j = scantable[i];
260  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
261  level = (level - 1) | 1;
262  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
263  SHOW_SBITS(re, &s->gb, 1);
264  SKIP_BITS(re, &s->gb, 1);
265  } else {
266  /* escape */
267  run = SHOW_UBITS(re, &s->gb, 6) + 1;
268  LAST_SKIP_BITS(re, &s->gb, 6);
269  UPDATE_CACHE(re, &s->gb);
270  level = SHOW_SBITS(re, &s->gb, 8);
271  SKIP_BITS(re, &s->gb, 8);
272  if (level == -128) {
273  level = SHOW_UBITS(re, &s->gb, 8) - 256;
274  SKIP_BITS(re, &s->gb, 8);
275  } else if (level == 0) {
276  level = SHOW_UBITS(re, &s->gb, 8);
277  SKIP_BITS(re, &s->gb, 8);
278  }
279  i += run;
280  check_scantable_index(s, i);
281  j = scantable[i];
282  if (level < 0) {
283  level = -level;
284  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
285  level = (level - 1) | 1;
286  level = -level;
287  } else {
288  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
289  level = (level - 1) | 1;
290  }
291  }
292 
293  block[j] = level;
294  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
295  break;
296  UPDATE_CACHE(re, &s->gb);
297  }
298 end:
299  LAST_SKIP_BITS(re, &s->gb, 2);
300  CLOSE_READER(re, &s->gb);
301  }
302  s->block_last_index[n] = i;
303  return 0;
304 }
305 
306 /**
307  * Note: this function can read out of range and crash for corrupt streams.
308  * Changing this would eat up any speed benefits it has.
309  * Do not use "fast" flag if you need the code to be robust.
310  */
311 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
312  int16_t *block, int n)
313 {
314  int level, i, j, run;
315  RLTable *rl = &ff_rl_mpeg1;
316  uint8_t *const scantable = s->intra_scantable.permutated;
317  const int qscale = s->qscale;
318 
319  {
320  OPEN_READER(re, &s->gb);
321  i = -1;
322  // Special case for first coefficient, no need to add second VLC table.
323  UPDATE_CACHE(re, &s->gb);
324  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
325  level = (3 * qscale) >> 1;
326  level = (level - 1) | 1;
327  if (GET_CACHE(re, &s->gb) & 0x40000000)
328  level = -level;
329  block[0] = level;
330  i++;
331  SKIP_BITS(re, &s->gb, 2);
332  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
333  goto end;
334  }
335 
336  /* now quantify & encode AC coefficients */
337  for (;;) {
338  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
339  TEX_VLC_BITS, 2, 0);
340 
341  if (level != 0) {
342  i += run;
343  check_scantable_index(s, i);
344  j = scantable[i];
345  level = ((level * 2 + 1) * qscale) >> 1;
346  level = (level - 1) | 1;
347  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
348  SHOW_SBITS(re, &s->gb, 1);
349  SKIP_BITS(re, &s->gb, 1);
350  } else {
351  /* escape */
352  run = SHOW_UBITS(re, &s->gb, 6) + 1;
353  LAST_SKIP_BITS(re, &s->gb, 6);
354  UPDATE_CACHE(re, &s->gb);
355  level = SHOW_SBITS(re, &s->gb, 8);
356  SKIP_BITS(re, &s->gb, 8);
357  if (level == -128) {
358  level = SHOW_UBITS(re, &s->gb, 8) - 256;
359  SKIP_BITS(re, &s->gb, 8);
360  } else if (level == 0) {
361  level = SHOW_UBITS(re, &s->gb, 8);
362  SKIP_BITS(re, &s->gb, 8);
363  }
364  i += run;
365  check_scantable_index(s, i);
366  j = scantable[i];
367  if (level < 0) {
368  level = -level;
369  level = ((level * 2 + 1) * qscale) >> 1;
370  level = (level - 1) | 1;
371  level = -level;
372  } else {
373  level = ((level * 2 + 1) * qscale) >> 1;
374  level = (level - 1) | 1;
375  }
376  }
377 
378  block[j] = level;
379  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
380  break;
381  UPDATE_CACHE(re, &s->gb);
382  }
383 end:
384  LAST_SKIP_BITS(re, &s->gb, 2);
385  CLOSE_READER(re, &s->gb);
386  }
387  s->block_last_index[n] = i;
388  return 0;
389 }
390 
391 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
392  int16_t *block, int n)
393 {
394  int level, i, j, run;
395  RLTable *rl = &ff_rl_mpeg1;
396  uint8_t *const scantable = s->intra_scantable.permutated;
397  const uint16_t *quant_matrix;
398  const int qscale = s->qscale;
399  int mismatch;
400 
401  mismatch = 1;
402 
403  {
404  OPEN_READER(re, &s->gb);
405  i = -1;
406  if (n < 4)
407  quant_matrix = s->inter_matrix;
408  else
409  quant_matrix = s->chroma_inter_matrix;
410 
411  // Special case for first coefficient, no need to add second VLC table.
412  UPDATE_CACHE(re, &s->gb);
413  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
414  level = (3 * qscale * quant_matrix[0]) >> 5;
415  if (GET_CACHE(re, &s->gb) & 0x40000000)
416  level = -level;
417  block[0] = level;
418  mismatch ^= level;
419  i++;
420  SKIP_BITS(re, &s->gb, 2);
421  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
422  goto end;
423  }
424 
425  /* now quantify & encode AC coefficients */
426  for (;;) {
427  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
428  TEX_VLC_BITS, 2, 0);
429 
430  if (level != 0) {
431  i += run;
432  check_scantable_index(s, i);
433  j = scantable[i];
434  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
435  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
436  SHOW_SBITS(re, &s->gb, 1);
437  SKIP_BITS(re, &s->gb, 1);
438  } else {
439  /* escape */
440  run = SHOW_UBITS(re, &s->gb, 6) + 1;
441  LAST_SKIP_BITS(re, &s->gb, 6);
442  UPDATE_CACHE(re, &s->gb);
443  level = SHOW_SBITS(re, &s->gb, 12);
444  SKIP_BITS(re, &s->gb, 12);
445 
446  i += run;
447  check_scantable_index(s, i);
448  j = scantable[i];
449  if (level < 0) {
450  level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
451  level = -level;
452  } else {
453  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
454  }
455  }
456 
457  mismatch ^= level;
458  block[j] = level;
459  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
460  break;
461  UPDATE_CACHE(re, &s->gb);
462  }
463 end:
464  LAST_SKIP_BITS(re, &s->gb, 2);
465  CLOSE_READER(re, &s->gb);
466  }
467  block[63] ^= (mismatch & 1);
468 
469  s->block_last_index[n] = i;
470  return 0;
471 }
472 
473 /**
474  * Note: this function can read out of range and crash for corrupt streams.
475  * Changing this would eat up any speed benefits it has.
476  * Do not use "fast" flag if you need the code to be robust.
477  */
478 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
479  int16_t *block, int n)
480 {
481  int level, i, j, run;
482  RLTable *rl = &ff_rl_mpeg1;
483  uint8_t *const scantable = s->intra_scantable.permutated;
484  const int qscale = s->qscale;
485  OPEN_READER(re, &s->gb);
486  i = -1;
487 
488  // special case for first coefficient, no need to add second VLC table
489  UPDATE_CACHE(re, &s->gb);
490  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
491  level = (3 * qscale) >> 1;
492  if (GET_CACHE(re, &s->gb) & 0x40000000)
493  level = -level;
494  block[0] = level;
495  i++;
496  SKIP_BITS(re, &s->gb, 2);
497  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
498  goto end;
499  }
500 
501  /* now quantify & encode AC coefficients */
502  for (;;) {
503  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
504 
505  if (level != 0) {
506  i += run;
507  j = scantable[i];
508  level = ((level * 2 + 1) * qscale) >> 1;
509  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
510  SHOW_SBITS(re, &s->gb, 1);
511  SKIP_BITS(re, &s->gb, 1);
512  } else {
513  /* escape */
514  run = SHOW_UBITS(re, &s->gb, 6) + 1;
515  LAST_SKIP_BITS(re, &s->gb, 6);
516  UPDATE_CACHE(re, &s->gb);
517  level = SHOW_SBITS(re, &s->gb, 12);
518  SKIP_BITS(re, &s->gb, 12);
519 
520  i += run;
521  j = scantable[i];
522  if (level < 0) {
523  level = ((-level * 2 + 1) * qscale) >> 1;
524  level = -level;
525  } else {
526  level = ((level * 2 + 1) * qscale) >> 1;
527  }
528  }
529 
530  block[j] = level;
531  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
532  break;
533 
534  UPDATE_CACHE(re, &s->gb);
535  }
536 end:
537  LAST_SKIP_BITS(re, &s->gb, 2);
538  CLOSE_READER(re, &s->gb);
539  s->block_last_index[n] = i;
540  return 0;
541 }
542 
543 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
544  int16_t *block, int n)
545 {
546  int level, dc, diff, i, j, run;
547  int component;
548  RLTable *rl;
549  uint8_t *const scantable = s->intra_scantable.permutated;
550  const uint16_t *quant_matrix;
551  const int qscale = s->qscale;
552  int mismatch;
553 
554  /* DC coefficient */
555  if (n < 4) {
556  quant_matrix = s->intra_matrix;
557  component = 0;
558  } else {
559  quant_matrix = s->chroma_intra_matrix;
560  component = (n & 1) + 1;
561  }
562  diff = decode_dc(&s->gb, component);
563  if (diff >= 0xffff)
564  return -1;
565  dc = s->last_dc[component];
566  dc += diff;
567  s->last_dc[component] = dc;
568  block[0] = dc << (3 - s->intra_dc_precision);
569  av_dlog(s->avctx, "dc=%d\n", block[0]);
570  mismatch = block[0] ^ 1;
571  i = 0;
572  if (s->intra_vlc_format)
573  rl = &ff_rl_mpeg2;
574  else
575  rl = &ff_rl_mpeg1;
576 
577  {
578  OPEN_READER(re, &s->gb);
579  /* now quantify & encode AC coefficients */
580  for (;;) {
581  UPDATE_CACHE(re, &s->gb);
582  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
583  TEX_VLC_BITS, 2, 0);
584 
585  if (level == 127) {
586  break;
587  } else if (level != 0) {
588  i += run;
589  check_scantable_index(s, i);
590  j = scantable[i];
591  level = (level * qscale * quant_matrix[j]) >> 4;
592  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
593  SHOW_SBITS(re, &s->gb, 1);
594  LAST_SKIP_BITS(re, &s->gb, 1);
595  } else {
596  /* escape */
597  run = SHOW_UBITS(re, &s->gb, 6) + 1;
598  LAST_SKIP_BITS(re, &s->gb, 6);
599  UPDATE_CACHE(re, &s->gb);
600  level = SHOW_SBITS(re, &s->gb, 12);
601  SKIP_BITS(re, &s->gb, 12);
602  i += run;
603  check_scantable_index(s, i);
604  j = scantable[i];
605  if (level < 0) {
606  level = (-level * qscale * quant_matrix[j]) >> 4;
607  level = -level;
608  } else {
609  level = (level * qscale * quant_matrix[j]) >> 4;
610  }
611  }
612 
613  mismatch ^= level;
614  block[j] = level;
615  }
616  CLOSE_READER(re, &s->gb);
617  }
618  block[63] ^= mismatch & 1;
619 
620  s->block_last_index[n] = i;
621  return 0;
622 }
623 
624 /**
625  * Note: this function can read out of range and crash for corrupt streams.
626  * Changing this would eat up any speed benefits it has.
627  * Do not use "fast" flag if you need the code to be robust.
628  */
629 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
630  int16_t *block, int n)
631 {
632  int level, dc, diff, i, j, run;
633  int component;
634  RLTable *rl;
635  uint8_t *const scantable = s->intra_scantable.permutated;
636  const uint16_t *quant_matrix;
637  const int qscale = s->qscale;
638 
639  /* DC coefficient */
640  if (n < 4) {
641  quant_matrix = s->intra_matrix;
642  component = 0;
643  } else {
644  quant_matrix = s->chroma_intra_matrix;
645  component = (n & 1) + 1;
646  }
647  diff = decode_dc(&s->gb, component);
648  if (diff >= 0xffff)
649  return -1;
650  dc = s->last_dc[component];
651  dc += diff;
652  s->last_dc[component] = dc;
653  block[0] = dc << (3 - s->intra_dc_precision);
654  i = 0;
655  if (s->intra_vlc_format)
656  rl = &ff_rl_mpeg2;
657  else
658  rl = &ff_rl_mpeg1;
659 
660  {
661  OPEN_READER(re, &s->gb);
662  /* now quantify & encode AC coefficients */
663  for (;;) {
664  UPDATE_CACHE(re, &s->gb);
665  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
666  TEX_VLC_BITS, 2, 0);
667 
668  if (level >= 64 || i > 63) {
669  break;
670  } else if (level != 0) {
671  i += run;
672  j = scantable[i];
673  level = (level * qscale * quant_matrix[j]) >> 4;
674  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
675  SHOW_SBITS(re, &s->gb, 1);
676  LAST_SKIP_BITS(re, &s->gb, 1);
677  } else {
678  /* escape */
679  run = SHOW_UBITS(re, &s->gb, 6) + 1;
680  LAST_SKIP_BITS(re, &s->gb, 6);
681  UPDATE_CACHE(re, &s->gb);
682  level = SHOW_SBITS(re, &s->gb, 12);
683  SKIP_BITS(re, &s->gb, 12);
684  i += run;
685  j = scantable[i];
686  if (level < 0) {
687  level = (-level * qscale * quant_matrix[j]) >> 4;
688  level = -level;
689  } else {
690  level = (level * qscale * quant_matrix[j]) >> 4;
691  }
692  }
693 
694  block[j] = level;
695  }
696  CLOSE_READER(re, &s->gb);
697  }
698 
699  s->block_last_index[n] = i;
700  return 0;
701 }
702 
703 /******************************************/
704 /* decoding */
705 
706 static inline int get_dmv(MpegEncContext *s)
707 {
708  if (get_bits1(&s->gb))
709  return 1 - (get_bits1(&s->gb) << 1);
710  else
711  return 0;
712 }
713 
714 static inline int get_qscale(MpegEncContext *s)
715 {
716  int qscale = get_bits(&s->gb, 5);
717  if (s->q_scale_type)
718  return non_linear_qscale[qscale];
719  else
720  return qscale << 1;
721 }
722 
723 
724 /* motion type (for MPEG-2) */
725 #define MT_FIELD 1
726 #define MT_FRAME 2
727 #define MT_16X8 2
728 #define MT_DMV 3
729 
730 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
731 {
732  int i, j, k, cbp, val, mb_type, motion_type;
733  const int mb_block_count = 4 + (1 << s->chroma_format);
734 
735  av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
736 
737  av_assert2(s->mb_skipped == 0);
738 
739  if (s->mb_skip_run-- != 0) {
740  if (s->pict_type == AV_PICTURE_TYPE_P) {
741  s->mb_skipped = 1;
742  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
743  MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
744  } else {
745  int mb_type;
746 
747  if (s->mb_x)
748  mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
749  else
750  // FIXME not sure if this is allowed in MPEG at all
751  mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
752  if (IS_INTRA(mb_type)) {
753  av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
754  return -1;
755  }
756  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
757  mb_type | MB_TYPE_SKIP;
758 
759  if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
760  s->mb_skipped = 1;
761  }
762 
763  return 0;
764  }
765 
766  switch (s->pict_type) {
767  default:
768  case AV_PICTURE_TYPE_I:
769  if (get_bits1(&s->gb) == 0) {
770  if (get_bits1(&s->gb) == 0) {
771  av_log(s->avctx, AV_LOG_ERROR,
772  "invalid mb type in I Frame at %d %d\n",
773  s->mb_x, s->mb_y);
774  return -1;
775  }
776  mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
777  } else {
778  mb_type = MB_TYPE_INTRA;
779  }
780  break;
781  case AV_PICTURE_TYPE_P:
782  mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
783  if (mb_type < 0) {
784  av_log(s->avctx, AV_LOG_ERROR,
785  "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
786  return -1;
787  }
788  mb_type = ptype2mb_type[mb_type];
789  break;
790  case AV_PICTURE_TYPE_B:
791  mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
792  if (mb_type < 0) {
793  av_log(s->avctx, AV_LOG_ERROR,
794  "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
795  return -1;
796  }
797  mb_type = btype2mb_type[mb_type];
798  break;
799  }
800  av_dlog(s->avctx, "mb_type=%x\n", mb_type);
801 // motion_type = 0; /* avoid warning */
802  if (IS_INTRA(mb_type)) {
803  s->bdsp.clear_blocks(s->block[0]);
804 
805  if (!s->chroma_y_shift)
806  s->bdsp.clear_blocks(s->block[6]);
807 
808  /* compute DCT type */
809  // FIXME: add an interlaced_dct coded var?
810  if (s->picture_structure == PICT_FRAME &&
811  !s->frame_pred_frame_dct)
812  s->interlaced_dct = get_bits1(&s->gb);
813 
814  if (IS_QUANT(mb_type))
815  s->qscale = get_qscale(s);
816 
817  if (s->concealment_motion_vectors) {
818  /* just parse them */
819  if (s->picture_structure != PICT_FRAME)
820  skip_bits1(&s->gb); /* field select */
821 
822  s->mv[0][0][0] =
823  s->last_mv[0][0][0] =
824  s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
825  s->last_mv[0][0][0]);
826  s->mv[0][0][1] =
827  s->last_mv[0][0][1] =
828  s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
829  s->last_mv[0][0][1]);
830 
831  skip_bits1(&s->gb); /* marker */
832  } else {
833  /* reset mv prediction */
834  memset(s->last_mv, 0, sizeof(s->last_mv));
835  }
836  s->mb_intra = 1;
837  // if 1, we memcpy blocks in xvmcvideo
838  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
839  ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
840 
841  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
842  if (s->flags2 & CODEC_FLAG2_FAST) {
843  for (i = 0; i < 6; i++)
844  mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
845  } else {
846  for (i = 0; i < mb_block_count; i++)
847  if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
848  return -1;
849  }
850  } else {
851  for (i = 0; i < 6; i++)
852  if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
853  return -1;
854  }
855  } else {
856  if (mb_type & MB_TYPE_ZERO_MV) {
857  av_assert2(mb_type & MB_TYPE_CBP);
858 
859  s->mv_dir = MV_DIR_FORWARD;
860  if (s->picture_structure == PICT_FRAME) {
861  if (s->picture_structure == PICT_FRAME
862  && !s->frame_pred_frame_dct)
863  s->interlaced_dct = get_bits1(&s->gb);
864  s->mv_type = MV_TYPE_16X16;
865  } else {
866  s->mv_type = MV_TYPE_FIELD;
867  mb_type |= MB_TYPE_INTERLACED;
868  s->field_select[0][0] = s->picture_structure - 1;
869  }
870 
871  if (IS_QUANT(mb_type))
872  s->qscale = get_qscale(s);
873 
874  s->last_mv[0][0][0] = 0;
875  s->last_mv[0][0][1] = 0;
876  s->last_mv[0][1][0] = 0;
877  s->last_mv[0][1][1] = 0;
878  s->mv[0][0][0] = 0;
879  s->mv[0][0][1] = 0;
880  } else {
881  av_assert2(mb_type & MB_TYPE_L0L1);
882  // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
883  /* get additional motion vector type */
884  if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
885  motion_type = MT_FRAME;
886  } else {
887  motion_type = get_bits(&s->gb, 2);
888  if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
889  s->interlaced_dct = get_bits1(&s->gb);
890  }
891 
892  if (IS_QUANT(mb_type))
893  s->qscale = get_qscale(s);
894 
895  /* motion vectors */
896  s->mv_dir = (mb_type >> 13) & 3;
897  av_dlog(s->avctx, "motion_type=%d\n", motion_type);
898  switch (motion_type) {
899  case MT_FRAME: /* or MT_16X8 */
900  if (s->picture_structure == PICT_FRAME) {
901  mb_type |= MB_TYPE_16x16;
902  s->mv_type = MV_TYPE_16X16;
903  for (i = 0; i < 2; i++) {
904  if (USES_LIST(mb_type, i)) {
905  /* MT_FRAME */
906  s->mv[i][0][0] =
907  s->last_mv[i][0][0] =
908  s->last_mv[i][1][0] =
909  mpeg_decode_motion(s, s->mpeg_f_code[i][0],
910  s->last_mv[i][0][0]);
911  s->mv[i][0][1] =
912  s->last_mv[i][0][1] =
913  s->last_mv[i][1][1] =
914  mpeg_decode_motion(s, s->mpeg_f_code[i][1],
915  s->last_mv[i][0][1]);
916  /* full_pel: only for MPEG-1 */
917  if (s->full_pel[i]) {
918  s->mv[i][0][0] <<= 1;
919  s->mv[i][0][1] <<= 1;
920  }
921  }
922  }
923  } else {
924  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
925  s->mv_type = MV_TYPE_16X8;
926  for (i = 0; i < 2; i++) {
927  if (USES_LIST(mb_type, i)) {
928  /* MT_16X8 */
929  for (j = 0; j < 2; j++) {
930  s->field_select[i][j] = get_bits1(&s->gb);
931  for (k = 0; k < 2; k++) {
932  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
933  s->last_mv[i][j][k]);
934  s->last_mv[i][j][k] = val;
935  s->mv[i][j][k] = val;
936  }
937  }
938  }
939  }
940  }
941  break;
942  case MT_FIELD:
943  s->mv_type = MV_TYPE_FIELD;
944  if (s->picture_structure == PICT_FRAME) {
945  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
946  for (i = 0; i < 2; i++) {
947  if (USES_LIST(mb_type, i)) {
948  for (j = 0; j < 2; j++) {
949  s->field_select[i][j] = get_bits1(&s->gb);
950  val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
951  s->last_mv[i][j][0]);
952  s->last_mv[i][j][0] = val;
953  s->mv[i][j][0] = val;
954  av_dlog(s->avctx, "fmx=%d\n", val);
955  val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
956  s->last_mv[i][j][1] >> 1);
957  s->last_mv[i][j][1] = val << 1;
958  s->mv[i][j][1] = val;
959  av_dlog(s->avctx, "fmy=%d\n", val);
960  }
961  }
962  }
963  } else {
964  av_assert0(!s->progressive_sequence);
965  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
966  for (i = 0; i < 2; i++) {
967  if (USES_LIST(mb_type, i)) {
968  s->field_select[i][0] = get_bits1(&s->gb);
969  for (k = 0; k < 2; k++) {
970  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
971  s->last_mv[i][0][k]);
972  s->last_mv[i][0][k] = val;
973  s->last_mv[i][1][k] = val;
974  s->mv[i][0][k] = val;
975  }
976  }
977  }
978  }
979  break;
980  case MT_DMV:
981  if (s->progressive_sequence){
982  av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
983  return -1;
984  }
985  s->mv_type = MV_TYPE_DMV;
986  for (i = 0; i < 2; i++) {
987  if (USES_LIST(mb_type, i)) {
988  int dmx, dmy, mx, my, m;
989  const int my_shift = s->picture_structure == PICT_FRAME;
990 
991  mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
992  s->last_mv[i][0][0]);
993  s->last_mv[i][0][0] = mx;
994  s->last_mv[i][1][0] = mx;
995  dmx = get_dmv(s);
996  my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
997  s->last_mv[i][0][1] >> my_shift);
998  dmy = get_dmv(s);
999 
1000 
1001  s->last_mv[i][0][1] = my << my_shift;
1002  s->last_mv[i][1][1] = my << my_shift;
1003 
1004  s->mv[i][0][0] = mx;
1005  s->mv[i][0][1] = my;
1006  s->mv[i][1][0] = mx; // not used
1007  s->mv[i][1][1] = my; // not used
1008 
1009  if (s->picture_structure == PICT_FRAME) {
1010  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1011 
1012  // m = 1 + 2 * s->top_field_first;
1013  m = s->top_field_first ? 1 : 3;
1014 
1015  /* top -> top pred */
1016  s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1017  s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1018  m = 4 - m;
1019  s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1020  s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1021  } else {
1022  mb_type |= MB_TYPE_16x16;
1023 
1024  s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1025  s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1026  if (s->picture_structure == PICT_TOP_FIELD)
1027  s->mv[i][2][1]--;
1028  else
1029  s->mv[i][2][1]++;
1030  }
1031  }
1032  }
1033  break;
1034  default:
1035  av_log(s->avctx, AV_LOG_ERROR,
1036  "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1037  return -1;
1038  }
1039  }
1040 
1041  s->mb_intra = 0;
1042  if (HAS_CBP(mb_type)) {
1043  s->bdsp.clear_blocks(s->block[0]);
1044 
1045  cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1046  if (mb_block_count > 6) {
1047  cbp <<= mb_block_count - 6;
1048  cbp |= get_bits(&s->gb, mb_block_count - 6);
1049  s->bdsp.clear_blocks(s->block[6]);
1050  }
1051  if (cbp <= 0) {
1052  av_log(s->avctx, AV_LOG_ERROR,
1053  "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1054  return -1;
1055  }
1056 
1057  // if 1, we memcpy blocks in xvmcvideo
1058  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1059  ff_xvmc_pack_pblocks(s, cbp);
1060 
1061  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1062  if (s->flags2 & CODEC_FLAG2_FAST) {
1063  for (i = 0; i < 6; i++) {
1064  if (cbp & 32)
1065  mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1066  else
1067  s->block_last_index[i] = -1;
1068  cbp += cbp;
1069  }
1070  } else {
1071  cbp <<= 12 - mb_block_count;
1072 
1073  for (i = 0; i < mb_block_count; i++) {
1074  if (cbp & (1 << 11)) {
1075  if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1076  return -1;
1077  } else {
1078  s->block_last_index[i] = -1;
1079  }
1080  cbp += cbp;
1081  }
1082  }
1083  } else {
1084  if (s->flags2 & CODEC_FLAG2_FAST) {
1085  for (i = 0; i < 6; i++) {
1086  if (cbp & 32)
1087  mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1088  else
1089  s->block_last_index[i] = -1;
1090  cbp += cbp;
1091  }
1092  } else {
1093  for (i = 0; i < 6; i++) {
1094  if (cbp & 32) {
1095  if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1096  return -1;
1097  } else {
1098  s->block_last_index[i] = -1;
1099  }
1100  cbp += cbp;
1101  }
1102  }
1103  }
1104  } else {
1105  for (i = 0; i < 12; i++)
1106  s->block_last_index[i] = -1;
1107  }
1108  }
1109 
1110  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1111 
1112  return 0;
1113 }
1114 
1115 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1116 {
1117  Mpeg1Context *s = avctx->priv_data;
1118  MpegEncContext *s2 = &s->mpeg_enc_ctx;
1119  int i;
1120 
1121  /* we need some permutation to store matrices,
1122  * until MPV_common_init() sets the real permutation. */
1123  for (i = 0; i < 64; i++)
1124  s2->idsp.idct_permutation[i] = i;
1125 
1126  ff_MPV_decode_defaults(s2);
1127 
1128  s->mpeg_enc_ctx.avctx = avctx;
1129  s->mpeg_enc_ctx.flags = avctx->flags;
1130  s->mpeg_enc_ctx.flags2 = avctx->flags2;
1131  ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1132  ff_mpeg12_init_vlcs();
1133 
1134  s->mpeg_enc_ctx_allocated = 0;
1135  s->mpeg_enc_ctx.picture_number = 0;
1136  s->repeat_field = 0;
1137  s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1138  avctx->color_range = AVCOL_RANGE_MPEG;
1139  if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1140  avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1141  else
1142  avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1143  return 0;
1144 }
1145 
1146 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1147  const AVCodecContext *avctx_from)
1148 {
1149  Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1150  MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1151  int err;
1152 
1153  if (avctx == avctx_from ||
1154  !ctx_from->mpeg_enc_ctx_allocated ||
1155  !s1->context_initialized)
1156  return 0;
1157 
1158  err = ff_mpeg_update_thread_context(avctx, avctx_from);
1159  if (err)
1160  return err;
1161 
1162  if (!ctx->mpeg_enc_ctx_allocated)
1163  memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1164 
1165  if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1166  s->picture_number++;
1167 
1168  return 0;
1169 }
1170 
1171 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1172  const uint8_t *new_perm)
1173 {
1174  uint16_t temp_matrix[64];
1175  int i;
1176 
1177  memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1178 
1179  for (i = 0; i < 64; i++)
1180  matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1181 }
1182 
1183 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1184 #if CONFIG_MPEG1_XVMC_HWACCEL
1185  AV_PIX_FMT_XVMC,
1186 #endif
1187 #if CONFIG_MPEG1_VDPAU_HWACCEL
1188  AV_PIX_FMT_VDPAU_MPEG1,
1189  AV_PIX_FMT_VDPAU,
1190 #endif
1191  AV_PIX_FMT_YUV420P,
1192  AV_PIX_FMT_NONE
1193 };
1194 
1195 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1196 #if CONFIG_MPEG2_XVMC_HWACCEL
1197  AV_PIX_FMT_XVMC,
1198 #endif
1199 #if CONFIG_MPEG2_VDPAU_HWACCEL
1200  AV_PIX_FMT_VDPAU_MPEG2,
1201  AV_PIX_FMT_VDPAU,
1202 #endif
1203 #if CONFIG_MPEG2_DXVA2_HWACCEL
1204  AV_PIX_FMT_DXVA2_VLD,
1205 #endif
1206 #if CONFIG_MPEG2_VAAPI_HWACCEL
1207  AV_PIX_FMT_VAAPI_VLD,
1208 #endif
1209  AV_PIX_FMT_YUV420P,
1210  AV_PIX_FMT_NONE
1211 };
1212 
1213 static inline int uses_vdpau(AVCodecContext *avctx) {
1214  return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1215 }
1216 
1217 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1218 {
1219  Mpeg1Context *s1 = avctx->priv_data;
1220  MpegEncContext *s = &s1->mpeg_enc_ctx;
1221 
1222  if (s->chroma_format < 2)
1223  return ff_thread_get_format(avctx,
1224  avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1225  mpeg1_hwaccel_pixfmt_list_420 :
1226  mpeg2_hwaccel_pixfmt_list_420);
1227  else if (s->chroma_format == 2)
1228  return AV_PIX_FMT_YUV422P;
1229  else
1230  return AV_PIX_FMT_YUV444P;
1231 }
1232 
1233 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1234 {
1235  // until then pix_fmt may be changed right after codec init
1236  if (avctx->hwaccel || uses_vdpau(avctx))
1237  if (avctx->idct_algo == FF_IDCT_AUTO)
1238  avctx->idct_algo = FF_IDCT_SIMPLE;
1239 
1240  if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1241  Mpeg1Context *s1 = avctx->priv_data;
1242  MpegEncContext *s = &s1->mpeg_enc_ctx;
1243 
1244  s->pack_pblocks = 1;
1245 #if FF_API_XVMC
1246  avctx->xvmc_acceleration = 2;
1247 #endif /* FF_API_XVMC */
1248  }
1249 }
1250 
1251 /* Call this function when we know all parameters.
1252  * It may be called in different places for MPEG-1 and MPEG-2. */
1253 static int mpeg_decode_postinit(AVCodecContext *avctx)
1254 {
1255  Mpeg1Context *s1 = avctx->priv_data;
1256  MpegEncContext *s = &s1->mpeg_enc_ctx;
1257  uint8_t old_permutation[64];
1258  int ret;
1259 
1260  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1261  avctx->coded_width != s->width ||
1262  avctx->coded_height != s->height ||
1263  s1->save_width != s->width ||
1264  s1->save_height != s->height ||
1265  s1->save_aspect_info != s->aspect_ratio_info ||
1266  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1267  0) {
1268  if (s1->mpeg_enc_ctx_allocated) {
1269  ParseContext pc = s->parse_context;
1270  s->parse_context.buffer = 0;
1271  ff_MPV_common_end(s);
1272  s->parse_context = pc;
1273  s1->mpeg_enc_ctx_allocated = 0;
1274  }
1275 
1276  if ((s->width == 0) || (s->height == 0))
1277  return -2;
1278 
1279  ret = ff_set_dimensions(avctx, s->width, s->height);
1280  if (ret < 0)
1281  return ret;
1282 
1283  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1284  avctx->rc_max_rate = s->bit_rate;
1285  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1286  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1287  avctx->bit_rate = s->bit_rate;
1288  }
1289  s1->save_aspect_info = s->aspect_ratio_info;
1290  s1->save_width = s->width;
1291  s1->save_height = s->height;
1292  s1->save_progressive_seq = s->progressive_sequence;
1293 
1294  /* low_delay may be forced, in this case we will have B-frames
1295  * that behave like P-frames. */
1296  avctx->has_b_frames = !s->low_delay;
1297 
1298  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1299  // MPEG-1 fps
1300  avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1301  avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1302  // MPEG-1 aspect
1303  avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1304  avctx->ticks_per_frame = 1;
1305  } else { // MPEG-2
1306  // MPEG-2 fps
1307  av_reduce(&s->avctx->time_base.den,
1308  &s->avctx->time_base.num,
1309  ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1310  ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1311  1 << 30);
1312  avctx->ticks_per_frame = 2;
1313  // MPEG-2 aspect
1314  if (s->aspect_ratio_info > 1) {
1315  AVRational dar =
1316  av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1317  (AVRational) { s1->pan_scan.width,
1318  s1->pan_scan.height }),
1319  (AVRational) { s->width, s->height });
1320 
1321  /* We ignore the spec here and guess a bit as reality does not
1322  * match the spec, see for example res_change_ffmpeg_aspect.ts
1323  * and sequence-display-aspect.mpg.
1324  * issue1613, 621, 562 */
1325  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1326  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1327  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1328  s->avctx->sample_aspect_ratio =
1329  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1330  (AVRational) { s->width, s->height });
1331  } else {
1332  s->avctx->sample_aspect_ratio =
1333  av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1334  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1335 // issue1613 4/3 16/9 -> 16/9
1336 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1337 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1338 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1339  av_dlog(avctx, "A %d/%d\n",
1340  ff_mpeg2_aspect[s->aspect_ratio_info].num,
1341  ff_mpeg2_aspect[s->aspect_ratio_info].den);
1342  av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1343  s->avctx->sample_aspect_ratio.den);
1344  }
1345  } else {
1346  s->avctx->sample_aspect_ratio =
1347  ff_mpeg2_aspect[s->aspect_ratio_info];
1348  }
1349  } // MPEG-2
1350 
1351  ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1352 
1353  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1354  setup_hwaccel_for_pixfmt(avctx);
1355 
1356  /* Quantization matrices may need reordering
1357  * if DCT permutation is changed. */
1358  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1359 
1360  if (ff_MPV_common_init(s) < 0)
1361  return -2;
1362 
1363  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1364  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1365  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1366  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1367 
1368  s1->mpeg_enc_ctx_allocated = 1;
1369  }
1370  return 0;
1371 }
1372 
1373 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1374  int buf_size)
1375 {
1376  Mpeg1Context *s1 = avctx->priv_data;
1377  MpegEncContext *s = &s1->mpeg_enc_ctx;
1378  int ref, f_code, vbv_delay;
1379 
1380  init_get_bits(&s->gb, buf, buf_size * 8);
1381 
1382  ref = get_bits(&s->gb, 10); /* temporal ref */
1383  s->pict_type = get_bits(&s->gb, 3);
1384  if (s->pict_type == 0 || s->pict_type > 3)
1385  return -1;
1386 
1387  vbv_delay = get_bits(&s->gb, 16);
1388  s->vbv_delay = vbv_delay;
1389  if (s->pict_type == AV_PICTURE_TYPE_P ||
1390  s->pict_type == AV_PICTURE_TYPE_B) {
1391  s->full_pel[0] = get_bits1(&s->gb);
1392  f_code = get_bits(&s->gb, 3);
1393  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1394  return -1;
1395  f_code += !f_code;
1396  s->mpeg_f_code[0][0] = f_code;
1397  s->mpeg_f_code[0][1] = f_code;
1398  }
1399  if (s->pict_type == AV_PICTURE_TYPE_B) {
1400  s->full_pel[1] = get_bits1(&s->gb);
1401  f_code = get_bits(&s->gb, 3);
1402  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1403  return -1;
1404  f_code += !f_code;
1405  s->mpeg_f_code[1][0] = f_code;
1406  s->mpeg_f_code[1][1] = f_code;
1407  }
1408  s->current_picture.f->pict_type = s->pict_type;
1409  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1410 
1411  if (avctx->debug & FF_DEBUG_PICT_INFO)
1412  av_log(avctx, AV_LOG_DEBUG,
1413  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1414 
1415  s->y_dc_scale = 8;
1416  s->c_dc_scale = 8;
1417  return 0;
1418 }
1419 
1420 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1421 {
1422  MpegEncContext *s = &s1->mpeg_enc_ctx;
1423  int horiz_size_ext, vert_size_ext;
1424  int bit_rate_ext;
1425 
1426  skip_bits(&s->gb, 1); /* profile and level esc*/
1427  s->avctx->profile = get_bits(&s->gb, 3);
1428  s->avctx->level = get_bits(&s->gb, 4);
1429  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1430  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1431  horiz_size_ext = get_bits(&s->gb, 2);
1432  vert_size_ext = get_bits(&s->gb, 2);
1433  s->width |= (horiz_size_ext << 12);
1434  s->height |= (vert_size_ext << 12);
1435  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1436  s->bit_rate += (bit_rate_ext << 18) * 400;
1437  skip_bits1(&s->gb); /* marker */
1438  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1439 
1440  s->low_delay = get_bits1(&s->gb);
1441  if (s->flags & CODEC_FLAG_LOW_DELAY)
1442  s->low_delay = 1;
1443 
1444  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1445  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1446 
1447  av_dlog(s->avctx, "sequence extension\n");
1448  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1449 
1450  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1451  av_log(s->avctx, AV_LOG_DEBUG,
1452  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1453  s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1454  s->avctx->rc_buffer_size, s->bit_rate);
1455 }
1456 
1457 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1458 {
1459  MpegEncContext *s = &s1->mpeg_enc_ctx;
1460  int color_description, w, h;
1461 
1462  skip_bits(&s->gb, 3); /* video format */
1463  color_description = get_bits1(&s->gb);
1464  if (color_description) {
1465  s->avctx->color_primaries = get_bits(&s->gb, 8);
1466  s->avctx->color_trc = get_bits(&s->gb, 8);
1467  s->avctx->colorspace = get_bits(&s->gb, 8);
1468  }
1469  w = get_bits(&s->gb, 14);
1470  skip_bits(&s->gb, 1); // marker
1471  h = get_bits(&s->gb, 14);
1472  // remaining 3 bits are zero padding
1473 
1474  s1->pan_scan.width = 16 * w;
1475  s1->pan_scan.height = 16 * h;
1476 
1477  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1478  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1479 }
1480 
1481 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1482 {
1483  MpegEncContext *s = &s1->mpeg_enc_ctx;
1484  int i, nofco;
1485 
1486  nofco = 1;
1487  if (s->progressive_sequence) {
1488  if (s->repeat_first_field) {
1489  nofco++;
1490  if (s->top_field_first)
1491  nofco++;
1492  }
1493  } else {
1494  if (s->picture_structure == PICT_FRAME) {
1495  nofco++;
1496  if (s->repeat_first_field)
1497  nofco++;
1498  }
1499  }
1500  for (i = 0; i < nofco; i++) {
1501  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1502  skip_bits(&s->gb, 1); // marker
1503  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1504  skip_bits(&s->gb, 1); // marker
1505  }
1506 
1507  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1508  av_log(s->avctx, AV_LOG_DEBUG,
1509  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1510  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1511  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1512  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1513 }
1514 
1515 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1516  uint16_t matrix1[64], int intra)
1517 {
1518  int i;
1519 
1520  for (i = 0; i < 64; i++) {
1521  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1522  int v = get_bits(&s->gb, 8);
1523  if (v == 0) {
1524  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1525  return -1;
1526  }
1527  if (intra && i == 0 && v != 8) {
1528  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1529  v = 8; // needed by pink.mpg / issue1046
1530  }
1531  matrix0[j] = v;
1532  if (matrix1)
1533  matrix1[j] = v;
1534  }
1535  return 0;
1536 }
1537 
1538 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1539 {
1540  av_dlog(s->avctx, "matrix extension\n");
1541 
1542  if (get_bits1(&s->gb))
1543  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1544  if (get_bits1(&s->gb))
1545  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1546  if (get_bits1(&s->gb))
1547  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1548  if (get_bits1(&s->gb))
1549  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1550 }
1551 
1552 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1553 {
1554  MpegEncContext *s = &s1->mpeg_enc_ctx;
1555 
1556  s->full_pel[0] = s->full_pel[1] = 0;
1557  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1558  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1559  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1560  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1561  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1562  av_log(s->avctx, AV_LOG_ERROR,
1563  "Missing picture start code, guessing missing values\n");
1564  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1565  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1566  s->pict_type = AV_PICTURE_TYPE_I;
1567  else
1568  s->pict_type = AV_PICTURE_TYPE_P;
1569  } else
1570  s->pict_type = AV_PICTURE_TYPE_B;
1571  s->current_picture.f->pict_type = s->pict_type;
1572  s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1573  }
1574  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1575  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1576  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1577  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1578 
1579  s->intra_dc_precision = get_bits(&s->gb, 2);
1580  s->picture_structure = get_bits(&s->gb, 2);
1581  s->top_field_first = get_bits1(&s->gb);
1582  s->frame_pred_frame_dct = get_bits1(&s->gb);
1583  s->concealment_motion_vectors = get_bits1(&s->gb);
1584  s->q_scale_type = get_bits1(&s->gb);
1585  s->intra_vlc_format = get_bits1(&s->gb);
1586  s->alternate_scan = get_bits1(&s->gb);
1587  s->repeat_first_field = get_bits1(&s->gb);
1588  s->chroma_420_type = get_bits1(&s->gb);
1589  s->progressive_frame = get_bits1(&s->gb);
1590 
1591  if (s->alternate_scan) {
1592  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1593  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1594  } else {
1595  ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1596  ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1597  }
1598 
1599  /* composite display not parsed */
1600  av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1601  av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1602  av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1603  av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1604  av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1605  av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1606  av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1607  av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1608  av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1609 }
1610 
1611 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1612 {
1613  AVCodecContext *avctx = s->avctx;
1614  Mpeg1Context *s1 = (Mpeg1Context *) s;
1615 
1616  /* start frame decoding */
1617  if (s->first_field || s->picture_structure == PICT_FRAME) {
1618  AVFrameSideData *pan_scan;
1619 
1620  if (ff_MPV_frame_start(s, avctx) < 0)
1621  return -1;
1622 
1623  ff_mpeg_er_frame_start(s);
1624 
1625  /* first check if we must repeat the frame */
1626  s->current_picture_ptr->f->repeat_pict = 0;
1627  if (s->repeat_first_field) {
1628  if (s->progressive_sequence) {
1629  if (s->top_field_first)
1630  s->current_picture_ptr->f->repeat_pict = 4;
1631  else
1632  s->current_picture_ptr->f->repeat_pict = 2;
1633  } else if (s->progressive_frame) {
1634  s->current_picture_ptr->f->repeat_pict = 1;
1635  }
1636  }
1637 
1638  pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1639  AV_FRAME_DATA_PANSCAN,
1640  sizeof(s1->pan_scan));
1641  if (!pan_scan)
1642  return AVERROR(ENOMEM);
1643  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1644 
1645  if (s1->a53_caption) {
1646  AVFrameSideData *sd = av_frame_new_side_data(
1647  s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1648  s1->a53_caption_size);
1649  if (sd)
1650  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1651  av_freep(&s1->a53_caption);
1652  }
1653 
1654  if (s1->has_stereo3d) {
1655  AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1656  if (!stereo)
1657  return AVERROR(ENOMEM);
1658 
1659  *stereo = s1->stereo3d;
1660  s1->has_stereo3d = 0;
1661  }
1662  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1663  ff_thread_finish_setup(avctx);
1664  } else { // second field
1665  int i;
1666 
1667  if (!s->current_picture_ptr) {
1668  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1669  return -1;
1670  }
1671 
1672  if (s->avctx->hwaccel &&
1673  (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1674  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1675  av_log(avctx, AV_LOG_ERROR,
1676  "hardware accelerator failed to decode first field\n");
1677  }
1678 
1679  for (i = 0; i < 4; i++) {
1680  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1681  if (s->picture_structure == PICT_BOTTOM_FIELD)
1682  s->current_picture.f->data[i] +=
1683  s->current_picture_ptr->f->linesize[i];
1684  }
1685  }
1686 
1687  if (avctx->hwaccel) {
1688  if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1689  return -1;
1690  }
1691 
1692  return 0;
1693 }
1694 
1695 #define DECODE_SLICE_ERROR -1
1696 #define DECODE_SLICE_OK 0
1697 
1698 /**
1699  * Decode a slice.
1700  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1701  * @return DECODE_SLICE_ERROR if the slice is damaged,
1702  * DECODE_SLICE_OK if this slice is OK
1703  */
1704 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1705  const uint8_t **buf, int buf_size)
1706 {
1707  AVCodecContext *avctx = s->avctx;
1708  const int lowres = s->avctx->lowres;
1709  const int field_pic = s->picture_structure != PICT_FRAME;
1710 
1711  s->resync_mb_x =
1712  s->resync_mb_y = -1;
1713 
1714  av_assert0(mb_y < s->mb_height);
1715 
1716  init_get_bits(&s->gb, *buf, buf_size * 8);
1717  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1718  skip_bits(&s->gb, 3);
1719 
1720  ff_mpeg1_clean_buffers(s);
1721  s->interlaced_dct = 0;
1722 
1723  s->qscale = get_qscale(s);
1724 
1725  if (s->qscale == 0) {
1726  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1727  return -1;
1728  }
1729 
1730  /* extra slice info */
1731  if (skip_1stop_8data_bits(&s->gb) < 0)
1732  return AVERROR_INVALIDDATA;
1733 
1734  s->mb_x = 0;
1735 
1736  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1737  skip_bits1(&s->gb);
1738  } else {
1739  while (get_bits_left(&s->gb) > 0) {
1740  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1741  MBINCR_VLC_BITS, 2);
1742  if (code < 0) {
1743  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1744  return -1;
1745  }
1746  if (code >= 33) {
1747  if (code == 33)
1748  s->mb_x += 33;
1749  /* otherwise, stuffing, nothing to do */
1750  } else {
1751  s->mb_x += code;
1752  break;
1753  }
1754  }
1755  }
1756 
1757  if (s->mb_x >= (unsigned) s->mb_width) {
1758  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1759  return -1;
1760  }
1761 
1762  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1763  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1764  int start_code = -1;
1765  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1766  if (buf_end < *buf + buf_size)
1767  buf_end -= 4;
1768  s->mb_y = mb_y;
1769  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1770  return DECODE_SLICE_ERROR;
1771  *buf = buf_end;
1772  return DECODE_SLICE_OK;
1773  }
1774 
1775  s->resync_mb_x = s->mb_x;
1776  s->resync_mb_y = s->mb_y = mb_y;
1777  s->mb_skip_run = 0;
1778  ff_init_block_index(s);
1779 
1780  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1781  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1782  av_log(s->avctx, AV_LOG_DEBUG,
1783  "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1784  s->qscale,
1785  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1786  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1787  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1788  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1789  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1790  s->progressive_sequence ? "ps" : "",
1791  s->progressive_frame ? "pf" : "",
1792  s->alternate_scan ? "alt" : "",
1793  s->top_field_first ? "top" : "",
1794  s->intra_dc_precision, s->picture_structure,
1795  s->frame_pred_frame_dct, s->concealment_motion_vectors,
1796  s->q_scale_type, s->intra_vlc_format,
1797  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1798  }
1799  }
1800 
1801  for (;;) {
1802  // If 1, we memcpy blocks in xvmcvideo.
1803  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1804  ff_xvmc_init_block(s); // set s->block
1805 
1806  if (mpeg_decode_mb(s, s->block) < 0)
1807  return -1;
1808 
1809  // Note motion_val is normally NULL unless we want to extract the MVs.
1810  if (s->current_picture.motion_val[0] && !s->encoding) {
1811  const int wrap = s->b8_stride;
1812  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1813  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1814  int motion_x, motion_y, dir, i;
1815 
1816  for (i = 0; i < 2; i++) {
1817  for (dir = 0; dir < 2; dir++) {
1818  if (s->mb_intra ||
1819  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1820  motion_x = motion_y = 0;
1821  } else if (s->mv_type == MV_TYPE_16X16 ||
1822  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1823  motion_x = s->mv[dir][0][0];
1824  motion_y = s->mv[dir][0][1];
1825  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1826  motion_x = s->mv[dir][i][0];
1827  motion_y = s->mv[dir][i][1];
1828  }
1829 
1830  s->current_picture.motion_val[dir][xy][0] = motion_x;
1831  s->current_picture.motion_val[dir][xy][1] = motion_y;
1832  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1833  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1834  s->current_picture.ref_index [dir][b8_xy] =
1835  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1836  av_assert2(s->field_select[dir][i] == 0 ||
1837  s->field_select[dir][i] == 1);
1838  }
1839  xy += wrap;
1840  b8_xy += 2;
1841  }
1842  }
1843 
1844  s->dest[0] += 16 >> lowres;
1845  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1846  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1847 
1848  ff_MPV_decode_mb(s, s->block);
1849 
1850  if (++s->mb_x >= s->mb_width) {
1851  const int mb_size = 16 >> s->avctx->lowres;
1852 
1853  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1854  ff_MPV_report_decode_progress(s);
1855 
1856  s->mb_x = 0;
1857  s->mb_y += 1 << field_pic;
1858 
1859  if (s->mb_y >= s->mb_height) {
1860  int left = get_bits_left(&s->gb);
1861  int is_d10 = s->chroma_format == 2 &&
1862  s->pict_type == AV_PICTURE_TYPE_I &&
1863  avctx->profile == 0 && avctx->level == 5 &&
1864  s->intra_dc_precision == 2 &&
1865  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1866  s->progressive_frame == 0
1867  /* vbv_delay == 0xBBB || 0xE10 */;
1868 
1869  if (left >= 32 && !is_d10) {
1870  GetBitContext gb = s->gb;
1871  align_get_bits(&gb);
1872  if (show_bits(&gb, 24) == 0x060E2B) {
1873  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1874  is_d10 = 1;
1875  }
1876  }
1877 
1878  if (left < 0 ||
1879  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1880  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1881  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1882  left, show_bits(&s->gb, FFMIN(left, 23)));
1883  return -1;
1884  } else
1885  goto eos;
1886  }
1887 
1888  ff_init_block_index(s);
1889  }
1890 
1891  /* skip mb handling */
1892  if (s->mb_skip_run == -1) {
1893  /* read increment again */
1894  s->mb_skip_run = 0;
1895  for (;;) {
1896  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1897  MBINCR_VLC_BITS, 2);
1898  if (code < 0) {
1899  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1900  return -1;
1901  }
1902  if (code >= 33) {
1903  if (code == 33) {
1904  s->mb_skip_run += 33;
1905  } else if (code == 35) {
1906  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1907  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1908  return -1;
1909  }
1910  goto eos; /* end of slice */
1911  }
1912  /* otherwise, stuffing, nothing to do */
1913  } else {
1914  s->mb_skip_run += code;
1915  break;
1916  }
1917  }
1918  if (s->mb_skip_run) {
1919  int i;
1920  if (s->pict_type == AV_PICTURE_TYPE_I) {
1921  av_log(s->avctx, AV_LOG_ERROR,
1922  "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1923  return -1;
1924  }
1925 
1926  /* skip mb */
1927  s->mb_intra = 0;
1928  for (i = 0; i < 12; i++)
1929  s->block_last_index[i] = -1;
1930  if (s->picture_structure == PICT_FRAME)
1931  s->mv_type = MV_TYPE_16X16;
1932  else
1933  s->mv_type = MV_TYPE_FIELD;
1934  if (s->pict_type == AV_PICTURE_TYPE_P) {
1935  /* if P type, zero motion vector is implied */
1936  s->mv_dir = MV_DIR_FORWARD;
1937  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1938  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1939  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1940  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1941  } else {
1942  /* if B type, reuse previous vectors and directions */
1943  s->mv[0][0][0] = s->last_mv[0][0][0];
1944  s->mv[0][0][1] = s->last_mv[0][0][1];
1945  s->mv[1][0][0] = s->last_mv[1][0][0];
1946  s->mv[1][0][1] = s->last_mv[1][0][1];
1947  }
1948  }
1949  }
1950  }
1951 eos: // end of slice
1952  if (get_bits_left(&s->gb) < 0)
1953  return AVERROR_INVALIDDATA;
1954  *buf += (get_bits_count(&s->gb) - 1) / 8;
1955  av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1956  return 0;
1957 }
1958 
1959 static int slice_decode_thread(AVCodecContext *c, void *arg)
1960 {
1961  MpegEncContext *s = *(void **) arg;
1962  const uint8_t *buf = s->gb.buffer;
1963  int mb_y = s->start_mb_y;
1964  const int field_pic = s->picture_structure != PICT_FRAME;
1965 
1966  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1967 
1968  for (;;) {
1969  uint32_t start_code;
1970  int ret;
1971 
1972  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1973  emms_c();
1974  av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1975  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1976  s->start_mb_y, s->end_mb_y, s->er.error_count);
1977  if (ret < 0) {
1978  if (c->err_recognition & AV_EF_EXPLODE)
1979  return ret;
1980  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1981  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1982  s->mb_x, s->mb_y,
1983  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1984  } else {
1985  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1986  s->mb_x - 1, s->mb_y,
1987  ER_AC_END | ER_DC_END | ER_MV_END);
1988  }
1989 
1990  if (s->mb_y == s->end_mb_y)
1991  return 0;
1992 
1993  start_code = -1;
1994  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1995  mb_y = start_code - SLICE_MIN_START_CODE;
1996  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1997  mb_y += (*buf&0xE0)<<2;
1998  mb_y <<= field_pic;
1999  if (s->picture_structure == PICT_BOTTOM_FIELD)
2000  mb_y++;
2001  if (mb_y < 0 || mb_y >= s->end_mb_y)
2002  return -1;
2003  }
2004 }
2005 
2006 /**
2007  * Handle slice ends.
2008  * @return 1 if it seems to be the last slice
2009  */
2010 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2011 {
2012  Mpeg1Context *s1 = avctx->priv_data;
2013  MpegEncContext *s = &s1->mpeg_enc_ctx;
2014 
2015  if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2016  return 0;
2017 
2018  if (s->avctx->hwaccel) {
2019  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2020  av_log(avctx, AV_LOG_ERROR,
2021  "hardware accelerator failed to decode picture\n");
2022  }
2023 
2024  /* end of slice reached */
2025  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2026  /* end of image */
2027 
2028  ff_er_frame_end(&s->er);
2029 
2030  ff_MPV_frame_end(s);
2031 
2032  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2033  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2034  if (ret < 0)
2035  return ret;
2036  ff_print_debug_info(s, s->current_picture_ptr, pict);
2037  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2038  } else {
2039  if (avctx->active_thread_type & FF_THREAD_FRAME)
2040  s->picture_number++;
2041  /* latency of 1 frame for I- and P-frames */
2042  /* XXX: use another variable than picture_number */
2043  if (s->last_picture_ptr != NULL) {
2044  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2045  if (ret < 0)
2046  return ret;
2047  ff_print_debug_info(s, s->last_picture_ptr, pict);
2048  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2049  }
2050  }
2051 
2052  return 1;
2053  } else {
2054  return 0;
2055  }
2056 }
2057 
2058 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2059  const uint8_t *buf, int buf_size)
2060 {
2061  Mpeg1Context *s1 = avctx->priv_data;
2062  MpegEncContext *s = &s1->mpeg_enc_ctx;
2063  int width, height;
2064  int i, v, j;
2065 
2066  init_get_bits(&s->gb, buf, buf_size * 8);
2067 
2068  width = get_bits(&s->gb, 12);
2069  height = get_bits(&s->gb, 12);
2070  if (width == 0 || height == 0) {
2071  av_log(avctx, AV_LOG_WARNING,
2072  "Invalid horizontal or vertical size value.\n");
2073  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2074  return AVERROR_INVALIDDATA;
2075  }
2076  s->aspect_ratio_info = get_bits(&s->gb, 4);
2077  if (s->aspect_ratio_info == 0) {
2078  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2079  if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2080  return -1;
2081  }
2082  s->frame_rate_index = get_bits(&s->gb, 4);
2083  if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2084  return -1;
2085  s->bit_rate = get_bits(&s->gb, 18) * 400;
2086  if (get_bits1(&s->gb) == 0) /* marker */
2087  return -1;
2088  s->width = width;
2089  s->height = height;
2090 
2091  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2092  skip_bits(&s->gb, 1);
2093 
2094  /* get matrix */
2095  if (get_bits1(&s->gb)) {
2096  load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2097  } else {
2098  for (i = 0; i < 64; i++) {
2099  j = s->idsp.idct_permutation[i];
2100  v = ff_mpeg1_default_intra_matrix[i];
2101  s->intra_matrix[j] = v;
2102  s->chroma_intra_matrix[j] = v;
2103  }
2104  }
2105  if (get_bits1(&s->gb)) {
2106  load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2107  } else {
2108  for (i = 0; i < 64; i++) {
2109  int j = s->idsp.idct_permutation[i];
2110  v = ff_mpeg1_default_non_intra_matrix[i];
2111  s->inter_matrix[j] = v;
2112  s->chroma_inter_matrix[j] = v;
2113  }
2114  }
2115 
2116  if (show_bits(&s->gb, 23) != 0) {
2117  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2118  return -1;
2119  }
2120 
2121  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2122  s->progressive_sequence = 1;
2123  s->progressive_frame = 1;
2124  s->picture_structure = PICT_FRAME;
2125  s->first_field = 0;
2126  s->frame_pred_frame_dct = 1;
2127  s->chroma_format = 1;
2128  s->codec_id =
2129  s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2130  s->out_format = FMT_MPEG1;
2131  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2132  if (s->flags & CODEC_FLAG_LOW_DELAY)
2133  s->low_delay = 1;
2134 
2135  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2136  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2137  s->avctx->rc_buffer_size, s->bit_rate);
2138 
2139  return 0;
2140 }
2141 
2142 static int vcr2_init_sequence(AVCodecContext *avctx)
2143 {
2144  Mpeg1Context *s1 = avctx->priv_data;
2145  MpegEncContext *s = &s1->mpeg_enc_ctx;
2146  int i, v;
2147 
2148  /* start new MPEG-1 context decoding */
2149  s->out_format = FMT_MPEG1;
2150  if (s1->mpeg_enc_ctx_allocated) {
2151  ff_MPV_common_end(s);
2152  s1->mpeg_enc_ctx_allocated = 0;
2153  }
2154  s->width = avctx->coded_width;
2155  s->height = avctx->coded_height;
2156  avctx->has_b_frames = 0; // true?
2157  s->low_delay = 1;
2158 
2159  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2160  setup_hwaccel_for_pixfmt(avctx);
2161 
2162  if (ff_MPV_common_init(s) < 0)
2163  return -1;
2164  s1->mpeg_enc_ctx_allocated = 1;
2165 
2166  for (i = 0; i < 64; i++) {
2167  int j = s->idsp.idct_permutation[i];
2168  v = ff_mpeg1_default_intra_matrix[i];
2169  s->intra_matrix[j] = v;
2170  s->chroma_intra_matrix[j] = v;
2171 
2172  v = ff_mpeg1_default_non_intra_matrix[i];
2173  s->inter_matrix[j] = v;
2174  s->chroma_inter_matrix[j] = v;
2175  }
2176 
2177  s->progressive_sequence = 1;
2178  s->progressive_frame = 1;
2179  s->picture_structure = PICT_FRAME;
2180  s->first_field = 0;
2181  s->frame_pred_frame_dct = 1;
2182  s->chroma_format = 1;
2183  if (s->codec_tag == AV_RL32("BW10")) {
2184  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2185  } else {
2186  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2187  s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2188  }
2189  s1->save_width = s->width;
2190  s1->save_height = s->height;
2191  s1->save_progressive_seq = s->progressive_sequence;
2192  return 0;
2193 }
2194 
2195 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2196  const uint8_t *p, int buf_size)
2197 {
2198  Mpeg1Context *s1 = avctx->priv_data;
2199 
2200  if (buf_size >= 6 &&
2201  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2202  p[4] == 3 && (p[5] & 0x40)) {
2203  /* extract A53 Part 4 CC data */
2204  int cc_count = p[5] & 0x1f;
2205  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2206  av_freep(&s1->a53_caption);
2207  s1->a53_caption_size = cc_count * 3;
2208  s1->a53_caption = av_malloc(s1->a53_caption_size);
2209  if (s1->a53_caption)
2210  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2211  }
2212  return 1;
2213  } else if (buf_size >= 11 &&
2214  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2215  /* extract DVD CC data */
2216  int cc_count = 0;
2217  int i;
2218  // There is a caption count field in the data, but it is often
2219  // incorect. So count the number of captions present.
2220  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2221  cc_count++;
2222  // Transform the DVD format into A53 Part 4 format
2223  if (cc_count > 0) {
2224  av_freep(&s1->a53_caption);
2225  s1->a53_caption_size = cc_count * 6;
2226  s1->a53_caption = av_malloc(s1->a53_caption_size);
2227  if (s1->a53_caption) {
2228  uint8_t field1 = !!(p[4] & 0x80);
2229  uint8_t *cap = s1->a53_caption;
2230  p += 5;
2231  for (i = 0; i < cc_count; i++) {
2232  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2233  cap[1] = p[1];
2234  cap[2] = p[2];
2235  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2236  cap[4] = p[4];
2237  cap[5] = p[5];
2238  cap += 6;
2239  p += 6;
2240  }
2241  }
2242  }
2243  return 1;
2244  }
2245  return 0;
2246 }
2247 
2248 static void mpeg_decode_user_data(AVCodecContext *avctx,
2249  const uint8_t *p, int buf_size)
2250 {
2251  Mpeg1Context *s = avctx->priv_data;
2252  const uint8_t *buf_end = p + buf_size;
2253 
2254  if (buf_size > 29){
2255  int i;
2256  for(i=0; i<20; i++)
2257  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2258  s->tmpgexs= 1;
2259  }
2260 
2261 /* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2262  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2263  }
2264  av_log(avctx, AV_LOG_ERROR, "\n");*/
2265  }
2266 
2267  /* we parse the DTG active format information */
2268  if (buf_end - p >= 5 &&
2269  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2270  int flags = p[4];
2271  p += 5;
2272  if (flags & 0x80) {
2273  /* skip event id */
2274  p += 2;
2275  }
2276  if (flags & 0x40) {
2277  if (buf_end - p < 1)
2278  return;
2279  avctx->dtg_active_format = p[0] & 0x0f;
2280  }
2281  } else if (buf_end - p >= 6 &&
2282  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2283  p[4] == 0x03) { // S3D_video_format_length
2284  // the 0x7F mask ignores the reserved_bit value
2285  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2286 
2287  if (S3D_video_format_type == 0x03 ||
2288  S3D_video_format_type == 0x04 ||
2289  S3D_video_format_type == 0x08 ||
2290  S3D_video_format_type == 0x23) {
2291  Mpeg1Context *s1 = avctx->priv_data;
2292 
2293  s1->has_stereo3d = 1;
2294 
2295  switch (S3D_video_format_type) {
2296  case 0x03:
2297  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2298  break;
2299  case 0x04:
2300  s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2301  break;
2302  case 0x08:
2303  s1->stereo3d.type = AV_STEREO3D_2D;
2304  break;
2305  case 0x23:
2306  s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2307  break;
2308  }
2309  }
2310  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2311  return;
2312  }
2313 }
2314 
2315 static void mpeg_decode_gop(AVCodecContext *avctx,
2316  const uint8_t *buf, int buf_size)
2317 {
2318  Mpeg1Context *s1 = avctx->priv_data;
2319  MpegEncContext *s = &s1->mpeg_enc_ctx;
2320  int broken_link;
2321  int64_t tc;
2322 
2323  init_get_bits(&s->gb, buf, buf_size * 8);
2324 
2325  tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2326 
2327  s->closed_gop = get_bits1(&s->gb);
2328  /* broken_link indicate that after editing the
2329  * reference frames of the first B-Frames after GOP I-Frame
2330  * are missing (open gop) */
2331  broken_link = get_bits1(&s->gb);
2332 
2333  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2334  char tcbuf[AV_TIMECODE_STR_SIZE];
2335  av_timecode_make_mpeg_tc_string(tcbuf, tc);
2336  av_log(s->avctx, AV_LOG_DEBUG,
2337  "GOP (%s) closed_gop=%d broken_link=%d\n",
2338  tcbuf, s->closed_gop, broken_link);
2339  }
2340 }
2341 
2342 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2343  int *got_output, const uint8_t *buf, int buf_size)
2344 {
2345  Mpeg1Context *s = avctx->priv_data;
2346  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2347  const uint8_t *buf_ptr = buf;
2348  const uint8_t *buf_end = buf + buf_size;
2349  int ret, input_size;
2350  int last_code = 0, skip_frame = 0;
2351  int picture_start_code_seen = 0;
2352 
2353  for (;;) {
2354  /* find next start code */
2355  uint32_t start_code = -1;
2356  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2357  if (start_code > 0x1ff) {
2358  if (!skip_frame) {
2359  if (HAVE_THREADS &&
2360  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2361  !avctx->hwaccel) {
2362  int i;
2363  av_assert0(avctx->thread_count > 1);
2364 
2365  avctx->execute(avctx, slice_decode_thread,
2366  &s2->thread_context[0], NULL,
2367  s->slice_count, sizeof(void *));
2368  for (i = 0; i < s->slice_count; i++)
2369  s2->er.error_count += s2->thread_context[i]->er.error_count;
2370  }
2371 
2372  if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2373  && uses_vdpau(avctx))
2374  ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2375 
2376  ret = slice_end(avctx, picture);
2377  if (ret < 0)
2378  return ret;
2379  else if (ret) {
2380  // FIXME: merge with the stuff in mpeg_decode_slice
2381  if (s2->last_picture_ptr || s2->low_delay)
2382  *got_output = 1;
2383  }
2384  }
2385  s2->pict_type = 0;
2386 
2387  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2388  return AVERROR_INVALIDDATA;
2389 
2390  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2391  }
2392 
2393  input_size = buf_end - buf_ptr;
2394 
2395  if (avctx->debug & FF_DEBUG_STARTCODE)
2396  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2397  start_code, buf_ptr - buf, input_size);
2398 
2399  /* prepare data for next start code */
2400  switch (start_code) {
2401  case SEQ_START_CODE:
2402  if (last_code == 0) {
2403  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2404  if (buf != avctx->extradata)
2405  s->sync = 1;
2406  } else {
2407  av_log(avctx, AV_LOG_ERROR,
2408  "ignoring SEQ_START_CODE after %X\n", last_code);
2409  if (avctx->err_recognition & AV_EF_EXPLODE)
2410  return AVERROR_INVALIDDATA;
2411  }
2412  break;
2413 
2414  case PICTURE_START_CODE:
2415  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2416  /* If it's a frame picture, there can't be more than one picture header.
2417  Yet, it does happen and we need to handle it. */
2418  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2419  break;
2420  }
2421  picture_start_code_seen = 1;
2422 
2423  if (s2->width <= 0 || s2->height <= 0) {
2424  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2425  s2->width, s2->height);
2426  return AVERROR_INVALIDDATA;
2427  }
2428 
2429  if (s->tmpgexs){
2430  s2->intra_dc_precision= 3;
2431  s2->intra_matrix[0]= 1;
2432  }
2433  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2434  !avctx->hwaccel && s->slice_count) {
2435  int i;
2436 
2437  avctx->execute(avctx, slice_decode_thread,
2438  s2->thread_context, NULL,
2439  s->slice_count, sizeof(void *));
2440  for (i = 0; i < s->slice_count; i++)
2441  s2->er.error_count += s2->thread_context[i]->er.error_count;
2442  s->slice_count = 0;
2443  }
2444  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2445  ret = mpeg_decode_postinit(avctx);
2446  if (ret < 0) {
2447  av_log(avctx, AV_LOG_ERROR,
2448  "mpeg_decode_postinit() failure\n");
2449  return ret;
2450  }
2451 
2452  /* We have a complete image: we try to decompress it. */
2453  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2454  s2->pict_type = 0;
2455  s->first_slice = 1;
2456  last_code = PICTURE_START_CODE;
2457  } else {
2458  av_log(avctx, AV_LOG_ERROR,
2459  "ignoring pic after %X\n", last_code);
2460  if (avctx->err_recognition & AV_EF_EXPLODE)
2461  return AVERROR_INVALIDDATA;
2462  }
2463  break;
2464  case EXT_START_CODE:
2465  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2466 
2467  switch (get_bits(&s2->gb, 4)) {
2468  case 0x1:
2469  if (last_code == 0) {
2470  mpeg_decode_sequence_extension(s);
2471  } else {
2472  av_log(avctx, AV_LOG_ERROR,
2473  "ignoring seq ext after %X\n", last_code);
2474  if (avctx->err_recognition & AV_EF_EXPLODE)
2475  return AVERROR_INVALIDDATA;
2476  }
2477  break;
2478  case 0x2:
2479  mpeg_decode_sequence_display_extension(s);
2480  break;
2481  case 0x3:
2482  mpeg_decode_quant_matrix_extension(s2);
2483  break;
2484  case 0x7:
2485  mpeg_decode_picture_display_extension(s);
2486  break;
2487  case 0x8:
2488  if (last_code == PICTURE_START_CODE) {
2489  mpeg_decode_picture_coding_extension(s);
2490  } else {
2491  av_log(avctx, AV_LOG_ERROR,
2492  "ignoring pic cod ext after %X\n", last_code);
2493  if (avctx->err_recognition & AV_EF_EXPLODE)
2494  return AVERROR_INVALIDDATA;
2495  }
2496  break;
2497  }
2498  break;
2499  case USER_START_CODE:
2500  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2501  break;
2502  case GOP_START_CODE:
2503  if (last_code == 0) {
2504  s2->first_field = 0;
2505  mpeg_decode_gop(avctx, buf_ptr, input_size);
2506  s->sync = 1;
2507  } else {
2508  av_log(avctx, AV_LOG_ERROR,
2509  "ignoring GOP_START_CODE after %X\n", last_code);
2510  if (avctx->err_recognition & AV_EF_EXPLODE)
2511  return AVERROR_INVALIDDATA;
2512  }
2513  break;
2514  default:
2515  if (start_code >= SLICE_MIN_START_CODE &&
2516  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2517  if (s2->progressive_sequence && !s2->progressive_frame) {
2518  s2->progressive_frame = 1;
2519  av_log(s2->avctx, AV_LOG_ERROR,
2520  "interlaced frame in progressive sequence, ignoring\n");
2521  }
2522 
2523  if (s2->picture_structure == 0 ||
2524  (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2525  av_log(s2->avctx, AV_LOG_ERROR,
2526  "picture_structure %d invalid, ignoring\n",
2527  s2->picture_structure);
2528  s2->picture_structure = PICT_FRAME;
2529  }
2530 
2531  if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2532  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2533 
2534  if (s2->picture_structure == PICT_FRAME) {
2535  s2->first_field = 0;
2536  s2->v_edge_pos = 16 * s2->mb_height;
2537  } else {
2538  s2->first_field ^= 1;
2539  s2->v_edge_pos = 8 * s2->mb_height;
2540  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2541  }
2542  }
2543  if (start_code >= SLICE_MIN_START_CODE &&
2544  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2545  const int field_pic = s2->picture_structure != PICT_FRAME;
2546  int mb_y = start_code - SLICE_MIN_START_CODE;
2547  last_code = SLICE_MIN_START_CODE;
2548  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2549  mb_y += (*buf_ptr&0xE0)<<2;
2550 
2551  mb_y <<= field_pic;
2552  if (s2->picture_structure == PICT_BOTTOM_FIELD)
2553  mb_y++;
2554 
2555  if (buf_end - buf_ptr < 2) {
2556  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2557  return AVERROR_INVALIDDATA;
2558  }
2559 
2560  if (mb_y >= s2->mb_height) {
2561  av_log(s2->avctx, AV_LOG_ERROR,
2562  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2563  return -1;
2564  }
2565 
2566  if (s2->last_picture_ptr == NULL) {
2567  /* Skip B-frames if we do not have reference frames and
2568  * GOP is not closed. */
2569  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2570  if (!s2->closed_gop) {
2571  skip_frame = 1;
2572  break;
2573  }
2574  }
2575  }
2576  if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2577  s->sync = 1;
2578  if (s2->next_picture_ptr == NULL) {
2579  /* Skip P-frames if we do not have a reference frame or
2580  * we have an invalid header. */
2581  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2582  skip_frame = 1;
2583  break;
2584  }
2585  }
2586  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2587  s2->pict_type == AV_PICTURE_TYPE_B) ||
2588  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2589  s2->pict_type != AV_PICTURE_TYPE_I) ||
2590  avctx->skip_frame >= AVDISCARD_ALL) {
2591  skip_frame = 1;
2592  break;
2593  }
2594 
2595  if (!s->mpeg_enc_ctx_allocated)
2596  break;
2597 
2598  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2599  if (mb_y < avctx->skip_top ||
2600  mb_y >= s2->mb_height - avctx->skip_bottom)
2601  break;
2602  }
2603 
2604  if (!s2->pict_type) {
2605  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2606  if (avctx->err_recognition & AV_EF_EXPLODE)
2607  return AVERROR_INVALIDDATA;
2608  break;
2609  }
2610 
2611  if (s->first_slice) {
2612  skip_frame = 0;
2613  s->first_slice = 0;
2614  if (mpeg_field_start(s2, buf, buf_size) < 0)
2615  return -1;
2616  }
2617  if (!s2->current_picture_ptr) {
2618  av_log(avctx, AV_LOG_ERROR,
2619  "current_picture not initialized\n");
2620  return AVERROR_INVALIDDATA;
2621  }
2622 
2623  if (uses_vdpau(avctx)) {
2624  s->slice_count++;
2625  break;
2626  }
2627 
2628  if (HAVE_THREADS &&
2629  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2630  !avctx->hwaccel) {
2631  int threshold = (s2->mb_height * s->slice_count +
2632  s2->slice_context_count / 2) /
2633  s2->slice_context_count;
2634  av_assert0(avctx->thread_count > 1);
2635  if (threshold <= mb_y) {
2636  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2637 
2638  thread_context->start_mb_y = mb_y;
2639  thread_context->end_mb_y = s2->mb_height;
2640  if (s->slice_count) {
2641  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2642  ret = ff_update_duplicate_context(thread_context, s2);
2643  if (ret < 0)
2644  return ret;
2645  }
2646  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2647  s->slice_count++;
2648  }
2649  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2650  } else {
2651  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2652  emms_c();
2653 
2654  if (ret < 0) {
2655  if (avctx->err_recognition & AV_EF_EXPLODE)
2656  return ret;
2657  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2658  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2659  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2660  ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2661  } else {
2662  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2663  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2664  ER_AC_END | ER_DC_END | ER_MV_END);
2665  }
2666  }
2667  }
2668  break;
2669  }
2670  }
2671 }
2672 
2673 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2674  int *got_output, AVPacket *avpkt)
2675 {
2676  const uint8_t *buf = avpkt->data;
2677  int ret;
2678  int buf_size = avpkt->size;
2679  Mpeg1Context *s = avctx->priv_data;
2680  AVFrame *picture = data;
2681  MpegEncContext *s2 = &s->mpeg_enc_ctx;
2682 
2683  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2684  /* special case for last picture */
2685  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2686  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2687  if (ret < 0)
2688  return ret;
2689 
2690  s2->next_picture_ptr = NULL;
2691 
2692  *got_output = 1;
2693  }
2694  return buf_size;
2695  }
2696 
2697  if (s2->flags & CODEC_FLAG_TRUNCATED) {
2698  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2699  buf_size, NULL);
2700 
2701  if (ff_combine_frame(&s2->parse_context, next,
2702  (const uint8_t **) &buf, &buf_size) < 0)
2703  return buf_size;
2704  }
2705 
2706  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2707  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2708  || s2->codec_tag == AV_RL32("BW10")
2709  ))
2710  vcr2_init_sequence(avctx);
2711 
2712  s->slice_count = 0;
2713 
2714  if (avctx->extradata && !s->extradata_decoded) {
2715  ret = decode_chunks(avctx, picture, got_output,
2716  avctx->extradata, avctx->extradata_size);
2717  if (*got_output) {
2718  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2719  *got_output = 0;
2720  }
2721  s->extradata_decoded = 1;
2722  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2723  s2->current_picture_ptr = NULL;
2724  return ret;
2725  }
2726  }
2727 
2728  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2729  if (ret<0 || *got_output)
2730  s2->current_picture_ptr = NULL;
2731 
2732  return ret;
2733 }
2734 
2735 static void flush(AVCodecContext *avctx)
2736 {
2737  Mpeg1Context *s = avctx->priv_data;
2738 
2739  s->sync = 0;
2740 
2741  ff_mpeg_flush(avctx);
2742 }
2743 
2744 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2745 {
2746  Mpeg1Context *s = avctx->priv_data;
2747 
2748  if (s->mpeg_enc_ctx_allocated)
2749  ff_MPV_common_end(&s->mpeg_enc_ctx);
2750  av_freep(&s->a53_caption);
2751  return 0;
2752 }
2753 
2754 static const AVProfile mpeg2_video_profiles[] = {
2755  { FF_PROFILE_MPEG2_422, "4:2:2" },
2756  { FF_PROFILE_MPEG2_HIGH, "High" },
2757  { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2758  { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2759  { FF_PROFILE_MPEG2_MAIN, "Main" },
2760  { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2761  { FF_PROFILE_RESERVED, "Reserved" },
2762  { FF_PROFILE_RESERVED, "Reserved" },
2763  { FF_PROFILE_UNKNOWN },
2764 };
2765 
2766 AVCodec ff_mpeg1video_decoder = {
2767  .name = "mpeg1video",
2768  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2769  .type = AVMEDIA_TYPE_VIDEO,
2770  .id = AV_CODEC_ID_MPEG1VIDEO,
2771  .priv_data_size = sizeof(Mpeg1Context),
2772  .init = mpeg_decode_init,
2773  .close = mpeg_decode_end,
2774  .decode = mpeg_decode_frame,
2775  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2776  CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2777  CODEC_CAP_SLICE_THREADS,
2778  .flush = flush,
2779  .max_lowres = 3,
2780  .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2781 };
2782 
2783 AVCodec ff_mpeg2video_decoder = {
2784  .name = "mpeg2video",
2785  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2786  .type = AVMEDIA_TYPE_VIDEO,
2787  .id = AV_CODEC_ID_MPEG2VIDEO,
2788  .priv_data_size = sizeof(Mpeg1Context),
2789  .init = mpeg_decode_init,
2790  .close = mpeg_decode_end,
2791  .decode = mpeg_decode_frame,
2792  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2793  CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2794  CODEC_CAP_SLICE_THREADS,
2795  .flush = flush,
2796  .max_lowres = 3,
2797  .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2798 };
2799 
2800 //legacy decoder
2801 AVCodec ff_mpegvideo_decoder = {
2802  .name = "mpegvideo",
2803  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2804  .type = AVMEDIA_TYPE_VIDEO,
2805  .id = AV_CODEC_ID_MPEG2VIDEO,
2806  .priv_data_size = sizeof(Mpeg1Context),
2807  .init = mpeg_decode_init,
2808  .close = mpeg_decode_end,
2809  .decode = mpeg_decode_frame,
2810  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2811  .flush = flush,
2812  .max_lowres = 3,
2813 };
2814 
2815 #if FF_API_XVMC
2816 #if CONFIG_MPEG_XVMC_DECODER
2817 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2818 {
2819  if (avctx->active_thread_type & FF_THREAD_SLICE)
2820  return -1;
2821  if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2822  return -1;
2823  if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2824  av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2825  }
2826  mpeg_decode_init(avctx);
2827 
2828  avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2829  avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2830 
2831  return 0;
2832 }
2833 
2834 AVCodec ff_mpeg_xvmc_decoder = {
2835  .name = "mpegvideo_xvmc",
2836  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2837  .type = AVMEDIA_TYPE_VIDEO,
2838  .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2839  .priv_data_size = sizeof(Mpeg1Context),
2840  .init = mpeg_mc_decode_init,
2841  .close = mpeg_decode_end,
2842  .decode = mpeg_decode_frame,
2843  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2844  CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2845  .flush = flush,
2846 };
2847 
2848 #endif
2849 #endif /* FF_API_XVMC */
2850 
2851 #if CONFIG_MPEG_VDPAU_DECODER
2852 AVCodec ff_mpeg_vdpau_decoder = {
2853  .name = "mpegvideo_vdpau",
2854  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2855  .type = AVMEDIA_TYPE_VIDEO,
2856  .id = AV_CODEC_ID_MPEG2VIDEO,
2857  .priv_data_size = sizeof(Mpeg1Context),
2858  .init = mpeg_decode_init,
2859  .close = mpeg_decode_end,
2860  .decode = mpeg_decode_frame,
2861  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2862  CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2863  .flush = flush,
2864 };
2865 #endif
2866 
2867 #if CONFIG_MPEG1_VDPAU_DECODER
2868 AVCodec ff_mpeg1_vdpau_decoder = {
2869  .name = "mpeg1video_vdpau",
2870  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2871  .type = AVMEDIA_TYPE_VIDEO,
2872  .id = AV_CODEC_ID_MPEG1VIDEO,
2873  .priv_data_size = sizeof(Mpeg1Context),
2874  .init = mpeg_decode_init,
2875  .close = mpeg_decode_end,
2876  .decode = mpeg_decode_frame,
2877  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2878  CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2879  .flush = flush,
2880 };
2881 #endif
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