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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 "dsputil.h"
38 #include "error_resilience.h"
39 #include "internal.h"
40 #include "mpeg12.h"
41 #include "mpeg12data.h"
42 #include "mpegutils.h"
43 #include "mpegvideo.h"
44 #include "thread.h"
45 #include "version.h"
46 #include "vdpau_internal.h"
47 #include "xvmc_internal.h"
48 
49 typedef struct Mpeg1Context {
51  int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
52  int repeat_field; /* true if we must repeat the field */
53  AVPanScan pan_scan; /* some temporary storage for the panscan */
61  AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
62  int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
63  int tmpgexs;
66 } Mpeg1Context;
67 
68 #define MB_TYPE_ZERO_MV 0x20000000
69 
70 static const uint32_t ptype2mb_type[7] = {
73  MB_TYPE_L0,
74  MB_TYPE_L0 | MB_TYPE_CBP,
77  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
78 };
79 
80 static const uint32_t btype2mb_type[11] = {
82  MB_TYPE_L1,
83  MB_TYPE_L1 | MB_TYPE_CBP,
84  MB_TYPE_L0,
85  MB_TYPE_L0 | MB_TYPE_CBP,
87  MB_TYPE_L0L1 | MB_TYPE_CBP,
89  MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
90  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
91  MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
92 };
93 
94 static const uint8_t non_linear_qscale[32] = {
95  0, 1, 2, 3, 4, 5, 6, 7,
96  8, 10, 12, 14, 16, 18, 20, 22,
97  24, 28, 32, 36, 40, 44, 48, 52,
98  56, 64, 72, 80, 88, 96, 104, 112,
99 };
100 
101 /* as H.263, but only 17 codes */
102 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
103 {
104  int code, sign, val, shift;
105 
106  code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
107  if (code == 0)
108  return pred;
109  if (code < 0)
110  return 0xffff;
111 
112  sign = get_bits1(&s->gb);
113  shift = fcode - 1;
114  val = code;
115  if (shift) {
116  val = (val - 1) << shift;
117  val |= get_bits(&s->gb, shift);
118  val++;
119  }
120  if (sign)
121  val = -val;
122  val += pred;
123 
124  /* modulo decoding */
125  return sign_extend(val, 5 + shift);
126 }
127 
128 #define check_scantable_index(ctx, x) \
129  do { \
130  if ((x) > 63) { \
131  av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
132  ctx->mb_x, ctx->mb_y); \
133  return AVERROR_INVALIDDATA; \
134  } \
135  } while (0)
136 
138  int16_t *block, int n)
139 {
140  int level, dc, diff, i, j, run;
141  int component;
142  RLTable *rl = &ff_rl_mpeg1;
143  uint8_t *const scantable = s->intra_scantable.permutated;
144  const uint16_t *quant_matrix = s->intra_matrix;
145  const int qscale = s->qscale;
146 
147  /* DC coefficient */
148  component = (n <= 3 ? 0 : n - 4 + 1);
149  diff = decode_dc(&s->gb, component);
150  if (diff >= 0xffff)
151  return -1;
152  dc = s->last_dc[component];
153  dc += diff;
154  s->last_dc[component] = dc;
155  block[0] = dc * quant_matrix[0];
156  av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
157  i = 0;
158  {
159  OPEN_READER(re, &s->gb);
160  UPDATE_CACHE(re, &s->gb);
161  if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
162  goto end;
163 
164  /* now quantify & encode AC coefficients */
165  for (;;) {
166  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
167  TEX_VLC_BITS, 2, 0);
168 
169  if (level != 0) {
170  i += run;
171  check_scantable_index(s, i);
172  j = scantable[i];
173  level = (level * qscale * quant_matrix[j]) >> 4;
174  level = (level - 1) | 1;
175  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
176  SHOW_SBITS(re, &s->gb, 1);
177  SKIP_BITS(re, &s->gb, 1);
178  } else {
179  /* escape */
180  run = SHOW_UBITS(re, &s->gb, 6) + 1;
181  LAST_SKIP_BITS(re, &s->gb, 6);
182  UPDATE_CACHE(re, &s->gb);
183  level = SHOW_SBITS(re, &s->gb, 8);
184  SKIP_BITS(re, &s->gb, 8);
185  if (level == -128) {
186  level = SHOW_UBITS(re, &s->gb, 8) - 256;
187  SKIP_BITS(re, &s->gb, 8);
188  } else if (level == 0) {
189  level = SHOW_UBITS(re, &s->gb, 8);
190  SKIP_BITS(re, &s->gb, 8);
191  }
192  i += run;
193  check_scantable_index(s, i);
194  j = scantable[i];
195  if (level < 0) {
196  level = -level;
197  level = (level * qscale * quant_matrix[j]) >> 4;
198  level = (level - 1) | 1;
199  level = -level;
200  } else {
201  level = (level * qscale * quant_matrix[j]) >> 4;
202  level = (level - 1) | 1;
203  }
204  }
205 
206  block[j] = level;
207  if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
208  break;
209 
210  UPDATE_CACHE(re, &s->gb);
211  }
212 end:
213  LAST_SKIP_BITS(re, &s->gb, 2);
214  CLOSE_READER(re, &s->gb);
215  }
216  s->block_last_index[n] = i;
217  return 0;
218 }
219 
221 {
222  return mpeg1_decode_block_intra(s, block, n);
223 }
224 
226  int16_t *block, int n)
227 {
228  int level, i, j, run;
229  RLTable *rl = &ff_rl_mpeg1;
230  uint8_t *const scantable = s->intra_scantable.permutated;
231  const uint16_t *quant_matrix = s->inter_matrix;
232  const int qscale = s->qscale;
233 
234  {
235  OPEN_READER(re, &s->gb);
236  i = -1;
237  // special case for first coefficient, no need to add second VLC table
238  UPDATE_CACHE(re, &s->gb);
239  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
240  level = (3 * qscale * quant_matrix[0]) >> 5;
241  level = (level - 1) | 1;
242  if (GET_CACHE(re, &s->gb) & 0x40000000)
243  level = -level;
244  block[0] = level;
245  i++;
246  SKIP_BITS(re, &s->gb, 2);
247  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
248  goto end;
249  }
250  /* now quantify & encode AC coefficients */
251  for (;;) {
252  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
253  TEX_VLC_BITS, 2, 0);
254 
255  if (level != 0) {
256  i += run;
257  check_scantable_index(s, i);
258  j = scantable[i];
259  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
260  level = (level - 1) | 1;
261  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
262  SHOW_SBITS(re, &s->gb, 1);
263  SKIP_BITS(re, &s->gb, 1);
264  } else {
265  /* escape */
266  run = SHOW_UBITS(re, &s->gb, 6) + 1;
267  LAST_SKIP_BITS(re, &s->gb, 6);
268  UPDATE_CACHE(re, &s->gb);
269  level = SHOW_SBITS(re, &s->gb, 8);
270  SKIP_BITS(re, &s->gb, 8);
271  if (level == -128) {
272  level = SHOW_UBITS(re, &s->gb, 8) - 256;
273  SKIP_BITS(re, &s->gb, 8);
274  } else if (level == 0) {
275  level = SHOW_UBITS(re, &s->gb, 8);
276  SKIP_BITS(re, &s->gb, 8);
277  }
278  i += run;
279  check_scantable_index(s, i);
280  j = scantable[i];
281  if (level < 0) {
282  level = -level;
283  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
284  level = (level - 1) | 1;
285  level = -level;
286  } else {
287  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
288  level = (level - 1) | 1;
289  }
290  }
291 
292  block[j] = level;
293  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
294  break;
295  UPDATE_CACHE(re, &s->gb);
296  }
297 end:
298  LAST_SKIP_BITS(re, &s->gb, 2);
299  CLOSE_READER(re, &s->gb);
300  }
301  s->block_last_index[n] = i;
302  return 0;
303 }
304 
305 /**
306  * Note: this function can read out of range and crash for corrupt streams.
307  * Changing this would eat up any speed benefits it has.
308  * Do not use "fast" flag if you need the code to be robust.
309  */
311  int16_t *block, int n)
312 {
313  int level, i, j, run;
314  RLTable *rl = &ff_rl_mpeg1;
315  uint8_t *const scantable = s->intra_scantable.permutated;
316  const int qscale = s->qscale;
317 
318  {
319  OPEN_READER(re, &s->gb);
320  i = -1;
321  // Special case for first coefficient, no need to add second VLC table.
322  UPDATE_CACHE(re, &s->gb);
323  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
324  level = (3 * qscale) >> 1;
325  level = (level - 1) | 1;
326  if (GET_CACHE(re, &s->gb) & 0x40000000)
327  level = -level;
328  block[0] = level;
329  i++;
330  SKIP_BITS(re, &s->gb, 2);
331  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
332  goto end;
333  }
334 
335  /* now quantify & encode AC coefficients */
336  for (;;) {
337  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
338  TEX_VLC_BITS, 2, 0);
339 
340  if (level != 0) {
341  i += run;
342  check_scantable_index(s, i);
343  j = scantable[i];
344  level = ((level * 2 + 1) * qscale) >> 1;
345  level = (level - 1) | 1;
346  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
347  SHOW_SBITS(re, &s->gb, 1);
348  SKIP_BITS(re, &s->gb, 1);
349  } else {
350  /* escape */
351  run = SHOW_UBITS(re, &s->gb, 6) + 1;
352  LAST_SKIP_BITS(re, &s->gb, 6);
353  UPDATE_CACHE(re, &s->gb);
354  level = SHOW_SBITS(re, &s->gb, 8);
355  SKIP_BITS(re, &s->gb, 8);
356  if (level == -128) {
357  level = SHOW_UBITS(re, &s->gb, 8) - 256;
358  SKIP_BITS(re, &s->gb, 8);
359  } else if (level == 0) {
360  level = SHOW_UBITS(re, &s->gb, 8);
361  SKIP_BITS(re, &s->gb, 8);
362  }
363  i += run;
364  check_scantable_index(s, i);
365  j = scantable[i];
366  if (level < 0) {
367  level = -level;
368  level = ((level * 2 + 1) * qscale) >> 1;
369  level = (level - 1) | 1;
370  level = -level;
371  } else {
372  level = ((level * 2 + 1) * qscale) >> 1;
373  level = (level - 1) | 1;
374  }
375  }
376 
377  block[j] = level;
378  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
379  break;
380  UPDATE_CACHE(re, &s->gb);
381  }
382 end:
383  LAST_SKIP_BITS(re, &s->gb, 2);
384  CLOSE_READER(re, &s->gb);
385  }
386  s->block_last_index[n] = i;
387  return 0;
388 }
389 
391  int16_t *block, int n)
392 {
393  int level, i, j, run;
394  RLTable *rl = &ff_rl_mpeg1;
395  uint8_t *const scantable = s->intra_scantable.permutated;
396  const uint16_t *quant_matrix;
397  const int qscale = s->qscale;
398  int mismatch;
399 
400  mismatch = 1;
401 
402  {
403  OPEN_READER(re, &s->gb);
404  i = -1;
405  if (n < 4)
406  quant_matrix = s->inter_matrix;
407  else
408  quant_matrix = s->chroma_inter_matrix;
409 
410  // Special case for first coefficient, no need to add second VLC table.
411  UPDATE_CACHE(re, &s->gb);
412  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
413  level = (3 * qscale * quant_matrix[0]) >> 5;
414  if (GET_CACHE(re, &s->gb) & 0x40000000)
415  level = -level;
416  block[0] = level;
417  mismatch ^= level;
418  i++;
419  SKIP_BITS(re, &s->gb, 2);
420  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
421  goto end;
422  }
423 
424  /* now quantify & encode AC coefficients */
425  for (;;) {
426  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
427  TEX_VLC_BITS, 2, 0);
428 
429  if (level != 0) {
430  i += run;
431  check_scantable_index(s, i);
432  j = scantable[i];
433  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
434  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
435  SHOW_SBITS(re, &s->gb, 1);
436  SKIP_BITS(re, &s->gb, 1);
437  } else {
438  /* escape */
439  run = SHOW_UBITS(re, &s->gb, 6) + 1;
440  LAST_SKIP_BITS(re, &s->gb, 6);
441  UPDATE_CACHE(re, &s->gb);
442  level = SHOW_SBITS(re, &s->gb, 12);
443  SKIP_BITS(re, &s->gb, 12);
444 
445  i += run;
446  check_scantable_index(s, i);
447  j = scantable[i];
448  if (level < 0) {
449  level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
450  level = -level;
451  } else {
452  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
453  }
454  }
455 
456  mismatch ^= level;
457  block[j] = level;
458  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
459  break;
460  UPDATE_CACHE(re, &s->gb);
461  }
462 end:
463  LAST_SKIP_BITS(re, &s->gb, 2);
464  CLOSE_READER(re, &s->gb);
465  }
466  block[63] ^= (mismatch & 1);
467 
468  s->block_last_index[n] = i;
469  return 0;
470 }
471 
472 /**
473  * Note: this function can read out of range and crash for corrupt streams.
474  * Changing this would eat up any speed benefits it has.
475  * Do not use "fast" flag if you need the code to be robust.
476  */
478  int16_t *block, int n)
479 {
480  int level, i, j, run;
481  RLTable *rl = &ff_rl_mpeg1;
482  uint8_t *const scantable = s->intra_scantable.permutated;
483  const int qscale = s->qscale;
484  OPEN_READER(re, &s->gb);
485  i = -1;
486 
487  // special case for first coefficient, no need to add second VLC table
488  UPDATE_CACHE(re, &s->gb);
489  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
490  level = (3 * qscale) >> 1;
491  if (GET_CACHE(re, &s->gb) & 0x40000000)
492  level = -level;
493  block[0] = level;
494  i++;
495  SKIP_BITS(re, &s->gb, 2);
496  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
497  goto end;
498  }
499 
500  /* now quantify & encode AC coefficients */
501  for (;;) {
502  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
503 
504  if (level != 0) {
505  i += run;
506  j = scantable[i];
507  level = ((level * 2 + 1) * qscale) >> 1;
508  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
509  SHOW_SBITS(re, &s->gb, 1);
510  SKIP_BITS(re, &s->gb, 1);
511  } else {
512  /* escape */
513  run = SHOW_UBITS(re, &s->gb, 6) + 1;
514  LAST_SKIP_BITS(re, &s->gb, 6);
515  UPDATE_CACHE(re, &s->gb);
516  level = SHOW_SBITS(re, &s->gb, 12);
517  SKIP_BITS(re, &s->gb, 12);
518 
519  i += run;
520  j = scantable[i];
521  if (level < 0) {
522  level = ((-level * 2 + 1) * qscale) >> 1;
523  level = -level;
524  } else {
525  level = ((level * 2 + 1) * qscale) >> 1;
526  }
527  }
528 
529  block[j] = level;
530  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
531  break;
532 
533  UPDATE_CACHE(re, &s->gb);
534  }
535 end:
536  LAST_SKIP_BITS(re, &s->gb, 2);
537  CLOSE_READER(re, &s->gb);
538  s->block_last_index[n] = i;
539  return 0;
540 }
541 
543  int16_t *block, int n)
544 {
545  int level, dc, diff, i, j, run;
546  int component;
547  RLTable *rl;
548  uint8_t *const scantable = s->intra_scantable.permutated;
549  const uint16_t *quant_matrix;
550  const int qscale = s->qscale;
551  int mismatch;
552 
553  /* DC coefficient */
554  if (n < 4) {
555  quant_matrix = s->intra_matrix;
556  component = 0;
557  } else {
558  quant_matrix = s->chroma_intra_matrix;
559  component = (n & 1) + 1;
560  }
561  diff = decode_dc(&s->gb, component);
562  if (diff >= 0xffff)
563  return -1;
564  dc = s->last_dc[component];
565  dc += diff;
566  s->last_dc[component] = dc;
567  block[0] = dc << (3 - s->intra_dc_precision);
568  av_dlog(s->avctx, "dc=%d\n", block[0]);
569  mismatch = block[0] ^ 1;
570  i = 0;
571  if (s->intra_vlc_format)
572  rl = &ff_rl_mpeg2;
573  else
574  rl = &ff_rl_mpeg1;
575 
576  {
577  OPEN_READER(re, &s->gb);
578  /* now quantify & encode AC coefficients */
579  for (;;) {
580  UPDATE_CACHE(re, &s->gb);
581  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
582  TEX_VLC_BITS, 2, 0);
583 
584  if (level == 127) {
585  break;
586  } else if (level != 0) {
587  i += run;
588  check_scantable_index(s, i);
589  j = scantable[i];
590  level = (level * qscale * quant_matrix[j]) >> 4;
591  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
592  SHOW_SBITS(re, &s->gb, 1);
593  LAST_SKIP_BITS(re, &s->gb, 1);
594  } else {
595  /* escape */
596  run = SHOW_UBITS(re, &s->gb, 6) + 1;
597  LAST_SKIP_BITS(re, &s->gb, 6);
598  UPDATE_CACHE(re, &s->gb);
599  level = SHOW_SBITS(re, &s->gb, 12);
600  SKIP_BITS(re, &s->gb, 12);
601  i += run;
602  check_scantable_index(s, i);
603  j = scantable[i];
604  if (level < 0) {
605  level = (-level * qscale * quant_matrix[j]) >> 4;
606  level = -level;
607  } else {
608  level = (level * qscale * quant_matrix[j]) >> 4;
609  }
610  }
611 
612  mismatch ^= level;
613  block[j] = level;
614  }
615  CLOSE_READER(re, &s->gb);
616  }
617  block[63] ^= mismatch & 1;
618 
619  s->block_last_index[n] = i;
620  return 0;
621 }
622 
623 /**
624  * Note: this function can read out of range and crash for corrupt streams.
625  * Changing this would eat up any speed benefits it has.
626  * Do not use "fast" flag if you need the code to be robust.
627  */
629  int16_t *block, int n)
630 {
631  int level, dc, diff, i, j, run;
632  int component;
633  RLTable *rl;
634  uint8_t *const scantable = s->intra_scantable.permutated;
635  const uint16_t *quant_matrix;
636  const int qscale = s->qscale;
637 
638  /* DC coefficient */
639  if (n < 4) {
640  quant_matrix = s->intra_matrix;
641  component = 0;
642  } else {
643  quant_matrix = s->chroma_intra_matrix;
644  component = (n & 1) + 1;
645  }
646  diff = decode_dc(&s->gb, component);
647  if (diff >= 0xffff)
648  return -1;
649  dc = s->last_dc[component];
650  dc += diff;
651  s->last_dc[component] = dc;
652  block[0] = dc << (3 - s->intra_dc_precision);
653  i = 0;
654  if (s->intra_vlc_format)
655  rl = &ff_rl_mpeg2;
656  else
657  rl = &ff_rl_mpeg1;
658 
659  {
660  OPEN_READER(re, &s->gb);
661  /* now quantify & encode AC coefficients */
662  for (;;) {
663  UPDATE_CACHE(re, &s->gb);
664  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
665  TEX_VLC_BITS, 2, 0);
666 
667  if (level >= 64 || i > 63) {
668  break;
669  } else if (level != 0) {
670  i += run;
671  j = scantable[i];
672  level = (level * qscale * quant_matrix[j]) >> 4;
673  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
674  SHOW_SBITS(re, &s->gb, 1);
675  LAST_SKIP_BITS(re, &s->gb, 1);
676  } else {
677  /* escape */
678  run = SHOW_UBITS(re, &s->gb, 6) + 1;
679  LAST_SKIP_BITS(re, &s->gb, 6);
680  UPDATE_CACHE(re, &s->gb);
681  level = SHOW_SBITS(re, &s->gb, 12);
682  SKIP_BITS(re, &s->gb, 12);
683  i += run;
684  j = scantable[i];
685  if (level < 0) {
686  level = (-level * qscale * quant_matrix[j]) >> 4;
687  level = -level;
688  } else {
689  level = (level * qscale * quant_matrix[j]) >> 4;
690  }
691  }
692 
693  block[j] = level;
694  }
695  CLOSE_READER(re, &s->gb);
696  }
697 
698  s->block_last_index[n] = i;
699  return 0;
700 }
701 
702 /******************************************/
703 /* decoding */
704 
705 static inline int get_dmv(MpegEncContext *s)
706 {
707  if (get_bits1(&s->gb))
708  return 1 - (get_bits1(&s->gb) << 1);
709  else
710  return 0;
711 }
712 
713 static inline int get_qscale(MpegEncContext *s)
714 {
715  int qscale = get_bits(&s->gb, 5);
716  if (s->q_scale_type)
717  return non_linear_qscale[qscale];
718  else
719  return qscale << 1;
720 }
721 
722 
723 /* motion type (for MPEG-2) */
724 #define MT_FIELD 1
725 #define MT_FRAME 2
726 #define MT_16X8 2
727 #define MT_DMV 3
728 
729 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
730 {
731  int i, j, k, cbp, val, mb_type, motion_type;
732  const int mb_block_count = 4 + (1 << s->chroma_format);
733 
734  av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
735 
736  av_assert2(s->mb_skipped == 0);
737 
738  if (s->mb_skip_run-- != 0) {
739  if (s->pict_type == AV_PICTURE_TYPE_P) {
740  s->mb_skipped = 1;
741  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
743  } else {
744  int mb_type;
745 
746  if (s->mb_x)
747  mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
748  else
749  // FIXME not sure if this is allowed in MPEG at all
750  mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
751  if (IS_INTRA(mb_type)) {
752  av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
753  return -1;
754  }
755  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
756  mb_type | MB_TYPE_SKIP;
757 
758  if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
759  s->mb_skipped = 1;
760  }
761 
762  return 0;
763  }
764 
765  switch (s->pict_type) {
766  default:
767  case AV_PICTURE_TYPE_I:
768  if (get_bits1(&s->gb) == 0) {
769  if (get_bits1(&s->gb) == 0) {
771  "invalid mb type in I Frame at %d %d\n",
772  s->mb_x, s->mb_y);
773  return -1;
774  }
775  mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
776  } else {
777  mb_type = MB_TYPE_INTRA;
778  }
779  break;
780  case AV_PICTURE_TYPE_P:
781  mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
782  if (mb_type < 0) {
784  "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
785  return -1;
786  }
787  mb_type = ptype2mb_type[mb_type];
788  break;
789  case AV_PICTURE_TYPE_B:
790  mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
791  if (mb_type < 0) {
793  "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
794  return -1;
795  }
796  mb_type = btype2mb_type[mb_type];
797  break;
798  }
799  av_dlog(s->avctx, "mb_type=%x\n", mb_type);
800 // motion_type = 0; /* avoid warning */
801  if (IS_INTRA(mb_type)) {
802  s->dsp.clear_blocks(s->block[0]);
803 
804  if (!s->chroma_y_shift)
805  s->dsp.clear_blocks(s->block[6]);
806 
807  /* compute DCT type */
808  // FIXME: add an interlaced_dct coded var?
809  if (s->picture_structure == PICT_FRAME &&
811  s->interlaced_dct = get_bits1(&s->gb);
812 
813  if (IS_QUANT(mb_type))
814  s->qscale = get_qscale(s);
815 
817  /* just parse them */
818  if (s->picture_structure != PICT_FRAME)
819  skip_bits1(&s->gb); /* field select */
820 
821  s->mv[0][0][0] =
822  s->last_mv[0][0][0] =
823  s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
824  s->last_mv[0][0][0]);
825  s->mv[0][0][1] =
826  s->last_mv[0][0][1] =
827  s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
828  s->last_mv[0][0][1]);
829 
830  skip_bits1(&s->gb); /* marker */
831  } else {
832  /* reset mv prediction */
833  memset(s->last_mv, 0, sizeof(s->last_mv));
834  }
835  s->mb_intra = 1;
836  // if 1, we memcpy blocks in xvmcvideo
837  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
838  ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
839 
840  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
841  if (s->flags2 & CODEC_FLAG2_FAST) {
842  for (i = 0; i < 6; i++)
844  } else {
845  for (i = 0; i < mb_block_count; i++)
846  if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
847  return -1;
848  }
849  } else {
850  for (i = 0; i < 6; i++)
851  if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
852  return -1;
853  }
854  } else {
855  if (mb_type & MB_TYPE_ZERO_MV) {
856  av_assert2(mb_type & MB_TYPE_CBP);
857 
858  s->mv_dir = MV_DIR_FORWARD;
859  if (s->picture_structure == PICT_FRAME) {
860  if (s->picture_structure == PICT_FRAME
861  && !s->frame_pred_frame_dct)
862  s->interlaced_dct = get_bits1(&s->gb);
863  s->mv_type = MV_TYPE_16X16;
864  } else {
865  s->mv_type = MV_TYPE_FIELD;
866  mb_type |= MB_TYPE_INTERLACED;
867  s->field_select[0][0] = s->picture_structure - 1;
868  }
869 
870  if (IS_QUANT(mb_type))
871  s->qscale = get_qscale(s);
872 
873  s->last_mv[0][0][0] = 0;
874  s->last_mv[0][0][1] = 0;
875  s->last_mv[0][1][0] = 0;
876  s->last_mv[0][1][1] = 0;
877  s->mv[0][0][0] = 0;
878  s->mv[0][0][1] = 0;
879  } else {
880  av_assert2(mb_type & MB_TYPE_L0L1);
881  // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
882  /* get additional motion vector type */
884  motion_type = MT_FRAME;
885  } else {
886  motion_type = get_bits(&s->gb, 2);
887  if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
888  s->interlaced_dct = get_bits1(&s->gb);
889  }
890 
891  if (IS_QUANT(mb_type))
892  s->qscale = get_qscale(s);
893 
894  /* motion vectors */
895  s->mv_dir = (mb_type >> 13) & 3;
896  av_dlog(s->avctx, "motion_type=%d\n", motion_type);
897  switch (motion_type) {
898  case MT_FRAME: /* or MT_16X8 */
899  if (s->picture_structure == PICT_FRAME) {
900  mb_type |= MB_TYPE_16x16;
901  s->mv_type = MV_TYPE_16X16;
902  for (i = 0; i < 2; i++) {
903  if (USES_LIST(mb_type, i)) {
904  /* MT_FRAME */
905  s->mv[i][0][0] =
906  s->last_mv[i][0][0] =
907  s->last_mv[i][1][0] =
908  mpeg_decode_motion(s, s->mpeg_f_code[i][0],
909  s->last_mv[i][0][0]);
910  s->mv[i][0][1] =
911  s->last_mv[i][0][1] =
912  s->last_mv[i][1][1] =
913  mpeg_decode_motion(s, s->mpeg_f_code[i][1],
914  s->last_mv[i][0][1]);
915  /* full_pel: only for MPEG-1 */
916  if (s->full_pel[i]) {
917  s->mv[i][0][0] <<= 1;
918  s->mv[i][0][1] <<= 1;
919  }
920  }
921  }
922  } else {
923  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
924  s->mv_type = MV_TYPE_16X8;
925  for (i = 0; i < 2; i++) {
926  if (USES_LIST(mb_type, i)) {
927  /* MT_16X8 */
928  for (j = 0; j < 2; j++) {
929  s->field_select[i][j] = get_bits1(&s->gb);
930  for (k = 0; k < 2; k++) {
931  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
932  s->last_mv[i][j][k]);
933  s->last_mv[i][j][k] = val;
934  s->mv[i][j][k] = val;
935  }
936  }
937  }
938  }
939  }
940  break;
941  case MT_FIELD:
942  s->mv_type = MV_TYPE_FIELD;
943  if (s->picture_structure == PICT_FRAME) {
944  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
945  for (i = 0; i < 2; i++) {
946  if (USES_LIST(mb_type, i)) {
947  for (j = 0; j < 2; j++) {
948  s->field_select[i][j] = get_bits1(&s->gb);
949  val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
950  s->last_mv[i][j][0]);
951  s->last_mv[i][j][0] = val;
952  s->mv[i][j][0] = val;
953  av_dlog(s->avctx, "fmx=%d\n", val);
954  val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
955  s->last_mv[i][j][1] >> 1);
956  s->last_mv[i][j][1] = val << 1;
957  s->mv[i][j][1] = val;
958  av_dlog(s->avctx, "fmy=%d\n", val);
959  }
960  }
961  }
962  } else {
964  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
965  for (i = 0; i < 2; i++) {
966  if (USES_LIST(mb_type, i)) {
967  s->field_select[i][0] = get_bits1(&s->gb);
968  for (k = 0; k < 2; k++) {
969  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
970  s->last_mv[i][0][k]);
971  s->last_mv[i][0][k] = val;
972  s->last_mv[i][1][k] = val;
973  s->mv[i][0][k] = val;
974  }
975  }
976  }
977  }
978  break;
979  case MT_DMV:
980  if (s->progressive_sequence){
981  av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
982  return -1;
983  }
984  s->mv_type = MV_TYPE_DMV;
985  for (i = 0; i < 2; i++) {
986  if (USES_LIST(mb_type, i)) {
987  int dmx, dmy, mx, my, m;
988  const int my_shift = s->picture_structure == PICT_FRAME;
989 
990  mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
991  s->last_mv[i][0][0]);
992  s->last_mv[i][0][0] = mx;
993  s->last_mv[i][1][0] = mx;
994  dmx = get_dmv(s);
995  my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
996  s->last_mv[i][0][1] >> my_shift);
997  dmy = get_dmv(s);
998 
999 
1000  s->last_mv[i][0][1] = my << my_shift;
1001  s->last_mv[i][1][1] = my << my_shift;
1002 
1003  s->mv[i][0][0] = mx;
1004  s->mv[i][0][1] = my;
1005  s->mv[i][1][0] = mx; // not used
1006  s->mv[i][1][1] = my; // not used
1007 
1008  if (s->picture_structure == PICT_FRAME) {
1009  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1010 
1011  // m = 1 + 2 * s->top_field_first;
1012  m = s->top_field_first ? 1 : 3;
1013 
1014  /* top -> top pred */
1015  s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1016  s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1017  m = 4 - m;
1018  s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1019  s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1020  } else {
1021  mb_type |= MB_TYPE_16x16;
1022 
1023  s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1024  s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1026  s->mv[i][2][1]--;
1027  else
1028  s->mv[i][2][1]++;
1029  }
1030  }
1031  }
1032  break;
1033  default:
1035  "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1036  return -1;
1037  }
1038  }
1039 
1040  s->mb_intra = 0;
1041  if (HAS_CBP(mb_type)) {
1042  s->dsp.clear_blocks(s->block[0]);
1043 
1044  cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1045  if (mb_block_count > 6) {
1046  cbp <<= mb_block_count - 6;
1047  cbp |= get_bits(&s->gb, mb_block_count - 6);
1048  s->dsp.clear_blocks(s->block[6]);
1049  }
1050  if (cbp <= 0) {
1052  "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1053  return -1;
1054  }
1055 
1056  // if 1, we memcpy blocks in xvmcvideo
1057  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1058  ff_xvmc_pack_pblocks(s, cbp);
1059 
1060  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1061  if (s->flags2 & CODEC_FLAG2_FAST) {
1062  for (i = 0; i < 6; i++) {
1063  if (cbp & 32)
1065  else
1066  s->block_last_index[i] = -1;
1067  cbp += cbp;
1068  }
1069  } else {
1070  cbp <<= 12 - mb_block_count;
1071 
1072  for (i = 0; i < mb_block_count; i++) {
1073  if (cbp & (1 << 11)) {
1074  if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1075  return -1;
1076  } else {
1077  s->block_last_index[i] = -1;
1078  }
1079  cbp += cbp;
1080  }
1081  }
1082  } else {
1083  if (s->flags2 & CODEC_FLAG2_FAST) {
1084  for (i = 0; i < 6; i++) {
1085  if (cbp & 32)
1086  mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1087  else
1088  s->block_last_index[i] = -1;
1089  cbp += cbp;
1090  }
1091  } else {
1092  for (i = 0; i < 6; i++) {
1093  if (cbp & 32) {
1094  if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1095  return -1;
1096  } else {
1097  s->block_last_index[i] = -1;
1098  }
1099  cbp += cbp;
1100  }
1101  }
1102  }
1103  } else {
1104  for (i = 0; i < 12; i++)
1105  s->block_last_index[i] = -1;
1106  }
1107  }
1108 
1109  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1110 
1111  return 0;
1112 }
1113 
1115 {
1116  Mpeg1Context *s = avctx->priv_data;
1118  int i;
1119 
1120  /* we need some permutation to store matrices,
1121  * until MPV_common_init() sets the real permutation. */
1122  for (i = 0; i < 64; i++)
1123  s2->dsp.idct_permutation[i] = i;
1124 
1126 
1127  s->mpeg_enc_ctx.avctx = avctx;
1128  s->mpeg_enc_ctx.flags = avctx->flags;
1129  s->mpeg_enc_ctx.flags2 = avctx->flags2;
1132 
1133  s->mpeg_enc_ctx_allocated = 0;
1135  s->repeat_field = 0;
1136  s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1137  avctx->color_range = AVCOL_RANGE_MPEG;
1138  if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1140  else
1142  return 0;
1143 }
1144 
1146  const AVCodecContext *avctx_from)
1147 {
1148  Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1149  MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1150  int err;
1151 
1152  if (avctx == avctx_from ||
1153  !ctx_from->mpeg_enc_ctx_allocated ||
1154  !s1->context_initialized)
1155  return 0;
1156 
1157  err = ff_mpeg_update_thread_context(avctx, avctx_from);
1158  if (err)
1159  return err;
1160 
1161  if (!ctx->mpeg_enc_ctx_allocated)
1162  memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1163 
1164  if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1165  s->picture_number++;
1166 
1167  return 0;
1168 }
1169 
1170 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1171  const uint8_t *new_perm)
1172 {
1173  uint16_t temp_matrix[64];
1174  int i;
1175 
1176  memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1177 
1178  for (i = 0; i < 64; i++)
1179  matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1180 }
1181 
1183 #if CONFIG_MPEG1_XVMC_HWACCEL
1185 #endif
1186 #if CONFIG_MPEG1_VDPAU_HWACCEL
1189 #endif
1192 };
1193 
1195 #if CONFIG_MPEG2_XVMC_HWACCEL
1197 #endif
1198 #if CONFIG_MPEG2_VDPAU_HWACCEL
1201 #endif
1202 #if CONFIG_MPEG2_DXVA2_HWACCEL
1204 #endif
1205 #if CONFIG_MPEG2_VAAPI_HWACCEL
1207 #endif
1210 };
1211 
1212 static inline int uses_vdpau(AVCodecContext *avctx) {
1213  return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1214 }
1215 
1217 {
1218  Mpeg1Context *s1 = avctx->priv_data;
1219  MpegEncContext *s = &s1->mpeg_enc_ctx;
1220 
1221  if (s->chroma_format < 2)
1222  return ff_thread_get_format(avctx,
1223  avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1226  else if (s->chroma_format == 2)
1227  return AV_PIX_FMT_YUV422P;
1228  else
1229  return AV_PIX_FMT_YUV444P;
1230 }
1231 
1233 {
1234  avctx->hwaccel = ff_find_hwaccel(avctx);
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. */
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 && (s->height&31)) ||
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  }
1290  s1->save_width = s->width;
1291  s1->save_height = s->height;
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
1302  // MPEG-1 aspect
1304  avctx->ticks_per_frame = 1;
1305  } else { // MPEG-2
1306  // MPEG-2 fps
1308  &s->avctx->time_base.num,
1311  1 << 30);
1312  avctx->ticks_per_frame = 2;
1313  // MPEG-2 aspect
1314  if (s->aspect_ratio_info > 1) {
1315  AVRational dar =
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 }))) {
1330  (AVRational) { s->width, s->height });
1331  } else {
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",
1342  av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1344  }
1345  } else {
1346  s->avctx->sample_aspect_ratio =
1347  ff_mpeg2_aspect[s->aspect_ratio_info];
1348  }
1349  } // MPEG-2
1350 
1351  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1352  setup_hwaccel_for_pixfmt(avctx);
1353 
1354  /* Quantization matrices may need reordering
1355  * if DCT permutation is changed. */
1356  memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1357 
1358  if (ff_MPV_common_init(s) < 0)
1359  return -2;
1360 
1361  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->dsp.idct_permutation);
1362  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->dsp.idct_permutation);
1363  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1364  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1365 
1366  s1->mpeg_enc_ctx_allocated = 1;
1367  }
1368  return 0;
1369 }
1370 
1372  int buf_size)
1373 {
1374  Mpeg1Context *s1 = avctx->priv_data;
1375  MpegEncContext *s = &s1->mpeg_enc_ctx;
1376  int ref, f_code, vbv_delay;
1377 
1378  init_get_bits(&s->gb, buf, buf_size * 8);
1379 
1380  ref = get_bits(&s->gb, 10); /* temporal ref */
1381  s->pict_type = get_bits(&s->gb, 3);
1382  if (s->pict_type == 0 || s->pict_type > 3)
1383  return -1;
1384 
1385  vbv_delay = get_bits(&s->gb, 16);
1386  s->vbv_delay = vbv_delay;
1387  if (s->pict_type == AV_PICTURE_TYPE_P ||
1388  s->pict_type == AV_PICTURE_TYPE_B) {
1389  s->full_pel[0] = get_bits1(&s->gb);
1390  f_code = get_bits(&s->gb, 3);
1391  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1392  return -1;
1393  f_code += !f_code;
1394  s->mpeg_f_code[0][0] = f_code;
1395  s->mpeg_f_code[0][1] = f_code;
1396  }
1397  if (s->pict_type == AV_PICTURE_TYPE_B) {
1398  s->full_pel[1] = get_bits1(&s->gb);
1399  f_code = get_bits(&s->gb, 3);
1400  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1401  return -1;
1402  f_code += !f_code;
1403  s->mpeg_f_code[1][0] = f_code;
1404  s->mpeg_f_code[1][1] = f_code;
1405  }
1408 
1409  if (avctx->debug & FF_DEBUG_PICT_INFO)
1410  av_log(avctx, AV_LOG_DEBUG,
1411  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1412 
1413  s->y_dc_scale = 8;
1414  s->c_dc_scale = 8;
1415  return 0;
1416 }
1417 
1419 {
1420  MpegEncContext *s = &s1->mpeg_enc_ctx;
1421  int horiz_size_ext, vert_size_ext;
1422  int bit_rate_ext;
1423 
1424  skip_bits(&s->gb, 1); /* profile and level esc*/
1425  s->avctx->profile = get_bits(&s->gb, 3);
1426  s->avctx->level = get_bits(&s->gb, 4);
1427  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1428  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1429  horiz_size_ext = get_bits(&s->gb, 2);
1430  vert_size_ext = get_bits(&s->gb, 2);
1431  s->width |= (horiz_size_ext << 12);
1432  s->height |= (vert_size_ext << 12);
1433  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1434  s->bit_rate += (bit_rate_ext << 18) * 400;
1435  skip_bits1(&s->gb); /* marker */
1436  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1437 
1438  s->low_delay = get_bits1(&s->gb);
1439  if (s->flags & CODEC_FLAG_LOW_DELAY)
1440  s->low_delay = 1;
1441 
1442  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1443  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1444 
1445  av_dlog(s->avctx, "sequence extension\n");
1447 
1448  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1450  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1452  s->avctx->rc_buffer_size, s->bit_rate);
1453 }
1454 
1456 {
1457  MpegEncContext *s = &s1->mpeg_enc_ctx;
1458  int color_description, w, h;
1459 
1460  skip_bits(&s->gb, 3); /* video format */
1461  color_description = get_bits1(&s->gb);
1462  if (color_description) {
1463  s->avctx->color_primaries = get_bits(&s->gb, 8);
1464  s->avctx->color_trc = get_bits(&s->gb, 8);
1465  s->avctx->colorspace = get_bits(&s->gb, 8);
1466  }
1467  w = get_bits(&s->gb, 14);
1468  skip_bits(&s->gb, 1); // marker
1469  h = get_bits(&s->gb, 14);
1470  // remaining 3 bits are zero padding
1471 
1472  s1->pan_scan.width = 16 * w;
1473  s1->pan_scan.height = 16 * h;
1474 
1475  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1476  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1477 }
1478 
1480 {
1481  MpegEncContext *s = &s1->mpeg_enc_ctx;
1482  int i, nofco;
1483 
1484  nofco = 1;
1485  if (s->progressive_sequence) {
1486  if (s->repeat_first_field) {
1487  nofco++;
1488  if (s->top_field_first)
1489  nofco++;
1490  }
1491  } else {
1492  if (s->picture_structure == PICT_FRAME) {
1493  nofco++;
1494  if (s->repeat_first_field)
1495  nofco++;
1496  }
1497  }
1498  for (i = 0; i < nofco; i++) {
1499  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1500  skip_bits(&s->gb, 1); // marker
1501  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1502  skip_bits(&s->gb, 1); // marker
1503  }
1504 
1505  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1507  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1508  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1509  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1510  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1511 }
1512 
1513 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1514  uint16_t matrix1[64], int intra)
1515 {
1516  int i;
1517 
1518  for (i = 0; i < 64; i++) {
1519  int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1520  int v = get_bits(&s->gb, 8);
1521  if (v == 0) {
1522  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1523  return -1;
1524  }
1525  if (intra && i == 0 && v != 8) {
1526  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1527  v = 8; // needed by pink.mpg / issue1046
1528  }
1529  matrix0[j] = v;
1530  if (matrix1)
1531  matrix1[j] = v;
1532  }
1533  return 0;
1534 }
1535 
1537 {
1538  av_dlog(s->avctx, "matrix extension\n");
1539 
1540  if (get_bits1(&s->gb))
1542  if (get_bits1(&s->gb))
1544  if (get_bits1(&s->gb))
1545  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1546  if (get_bits1(&s->gb))
1547  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1548 }
1549 
1551 {
1552  MpegEncContext *s = &s1->mpeg_enc_ctx;
1553 
1554  s->full_pel[0] = s->full_pel[1] = 0;
1555  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1556  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1557  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1558  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1559  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1561  "Missing picture start code, guessing missing values\n");
1562  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1563  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1565  else
1567  } else
1571  }
1572  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1573  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1574  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1575  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1576 
1577  s->intra_dc_precision = get_bits(&s->gb, 2);
1578  s->picture_structure = get_bits(&s->gb, 2);
1579  s->top_field_first = get_bits1(&s->gb);
1580  s->frame_pred_frame_dct = get_bits1(&s->gb);
1582  s->q_scale_type = get_bits1(&s->gb);
1583  s->intra_vlc_format = get_bits1(&s->gb);
1584  s->alternate_scan = get_bits1(&s->gb);
1585  s->repeat_first_field = get_bits1(&s->gb);
1586  s->chroma_420_type = get_bits1(&s->gb);
1587  s->progressive_frame = get_bits1(&s->gb);
1588 
1589  if (s->alternate_scan) {
1592  } else {
1595  }
1596 
1597  /* composite display not parsed */
1598  av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1599  av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1600  av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1601  av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1602  av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1603  av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1604  av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1605  av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1606  av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1607 }
1608 
1609 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1610 {
1611  AVCodecContext *avctx = s->avctx;
1612  Mpeg1Context *s1 = (Mpeg1Context *) s;
1613 
1614  /* start frame decoding */
1615  if (s->first_field || s->picture_structure == PICT_FRAME) {
1616  AVFrameSideData *pan_scan;
1617 
1618  if (ff_MPV_frame_start(s, avctx) < 0)
1619  return -1;
1620 
1622 
1623  /* first check if we must repeat the frame */
1625  if (s->repeat_first_field) {
1626  if (s->progressive_sequence) {
1627  if (s->top_field_first)
1629  else
1631  } else if (s->progressive_frame) {
1633  }
1634  }
1635 
1638  sizeof(s1->pan_scan));
1639  if (!pan_scan)
1640  return AVERROR(ENOMEM);
1641  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1642 
1643  if (s1->a53_caption) {
1646  s1->a53_caption_size);
1647  if (sd)
1648  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1649  av_freep(&s1->a53_caption);
1650  }
1651 
1652  if (s1->has_stereo3d) {
1654  if (!stereo)
1655  return AVERROR(ENOMEM);
1656 
1657  *stereo = s1->stereo3d;
1658  s1->has_stereo3d = 0;
1659  }
1660  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1661  ff_thread_finish_setup(avctx);
1662  } else { // second field
1663  int i;
1664 
1665  if (!s->current_picture_ptr) {
1666  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1667  return -1;
1668  }
1669 
1670  if (s->avctx->hwaccel &&
1672  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1673  av_log(avctx, AV_LOG_ERROR,
1674  "hardware accelerator failed to decode first field\n");
1675  }
1676 
1677  for (i = 0; i < 4; i++) {
1678  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1680  s->current_picture.f->data[i] +=
1681  s->current_picture_ptr->f->linesize[i];
1682  }
1683  }
1684 
1685  if (avctx->hwaccel) {
1686  if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1687  return -1;
1688  }
1689 
1690  return 0;
1691 }
1692 
1693 #define DECODE_SLICE_ERROR -1
1694 #define DECODE_SLICE_OK 0
1695 
1696 /**
1697  * Decode a slice.
1698  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1699  * @return DECODE_SLICE_ERROR if the slice is damaged,
1700  * DECODE_SLICE_OK if this slice is OK
1701  */
1702 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1703  const uint8_t **buf, int buf_size)
1704 {
1705  AVCodecContext *avctx = s->avctx;
1706  const int lowres = s->avctx->lowres;
1707  const int field_pic = s->picture_structure != PICT_FRAME;
1708 
1709  s->resync_mb_x =
1710  s->resync_mb_y = -1;
1711 
1712  av_assert0(mb_y < s->mb_height);
1713 
1714  init_get_bits(&s->gb, *buf, buf_size * 8);
1715  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1716  skip_bits(&s->gb, 3);
1717 
1719  s->interlaced_dct = 0;
1720 
1721  s->qscale = get_qscale(s);
1722 
1723  if (s->qscale == 0) {
1724  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1725  return -1;
1726  }
1727 
1728  /* extra slice info */
1729  if (skip_1stop_8data_bits(&s->gb) < 0)
1730  return AVERROR_INVALIDDATA;
1731 
1732  s->mb_x = 0;
1733 
1734  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1735  skip_bits1(&s->gb);
1736  } else {
1737  while (get_bits_left(&s->gb) > 0) {
1738  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1739  MBINCR_VLC_BITS, 2);
1740  if (code < 0) {
1741  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1742  return -1;
1743  }
1744  if (code >= 33) {
1745  if (code == 33)
1746  s->mb_x += 33;
1747  /* otherwise, stuffing, nothing to do */
1748  } else {
1749  s->mb_x += code;
1750  break;
1751  }
1752  }
1753  }
1754 
1755  if (s->mb_x >= (unsigned) s->mb_width) {
1756  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1757  return -1;
1758  }
1759 
1760  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1761  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1762  int start_code = -1;
1763  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1764  if (buf_end < *buf + buf_size)
1765  buf_end -= 4;
1766  s->mb_y = mb_y;
1767  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1768  return DECODE_SLICE_ERROR;
1769  *buf = buf_end;
1770  return DECODE_SLICE_OK;
1771  }
1772 
1773  s->resync_mb_x = s->mb_x;
1774  s->resync_mb_y = s->mb_y = mb_y;
1775  s->mb_skip_run = 0;
1777 
1778  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1779  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1781  "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1782  s->qscale,
1783  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1784  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1785  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1786  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1787  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1788  s->progressive_sequence ? "ps" : "",
1789  s->progressive_frame ? "pf" : "",
1790  s->alternate_scan ? "alt" : "",
1791  s->top_field_first ? "top" : "",
1795  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1796  }
1797  }
1798 
1799  for (;;) {
1800  // If 1, we memcpy blocks in xvmcvideo.
1801  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1802  ff_xvmc_init_block(s); // set s->block
1803 
1804  if (mpeg_decode_mb(s, s->block) < 0)
1805  return -1;
1806 
1807  // Note motion_val is normally NULL unless we want to extract the MVs.
1808  if (s->current_picture.motion_val[0] && !s->encoding) {
1809  const int wrap = s->b8_stride;
1810  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1811  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1812  int motion_x, motion_y, dir, i;
1813 
1814  for (i = 0; i < 2; i++) {
1815  for (dir = 0; dir < 2; dir++) {
1816  if (s->mb_intra ||
1817  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1818  motion_x = motion_y = 0;
1819  } else if (s->mv_type == MV_TYPE_16X16 ||
1820  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1821  motion_x = s->mv[dir][0][0];
1822  motion_y = s->mv[dir][0][1];
1823  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1824  motion_x = s->mv[dir][i][0];
1825  motion_y = s->mv[dir][i][1];
1826  }
1827 
1828  s->current_picture.motion_val[dir][xy][0] = motion_x;
1829  s->current_picture.motion_val[dir][xy][1] = motion_y;
1830  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1831  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1832  s->current_picture.ref_index [dir][b8_xy] =
1833  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1834  av_assert2(s->field_select[dir][i] == 0 ||
1835  s->field_select[dir][i] == 1);
1836  }
1837  xy += wrap;
1838  b8_xy += 2;
1839  }
1840  }
1841 
1842  s->dest[0] += 16 >> lowres;
1843  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1844  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1845 
1846  ff_MPV_decode_mb(s, s->block);
1847 
1848  if (++s->mb_x >= s->mb_width) {
1849  const int mb_size = 16 >> s->avctx->lowres;
1850 
1851  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1853 
1854  s->mb_x = 0;
1855  s->mb_y += 1 << field_pic;
1856 
1857  if (s->mb_y >= s->mb_height) {
1858  int left = get_bits_left(&s->gb);
1859  int is_d10 = s->chroma_format == 2 &&
1860  s->pict_type == AV_PICTURE_TYPE_I &&
1861  avctx->profile == 0 && avctx->level == 5 &&
1862  s->intra_dc_precision == 2 &&
1863  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1864  s->progressive_frame == 0
1865  /* vbv_delay == 0xBBB || 0xE10 */;
1866 
1867  if (left >= 32 && !is_d10) {
1868  GetBitContext gb = s->gb;
1869  align_get_bits(&gb);
1870  if (show_bits(&gb, 24) == 0x060E2B) {
1871  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1872  is_d10 = 1;
1873  }
1874  }
1875 
1876  if (left < 0 ||
1877  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1878  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1879  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1880  left, show_bits(&s->gb, FFMIN(left, 23)));
1881  return -1;
1882  } else
1883  goto eos;
1884  }
1885 
1887  }
1888 
1889  /* skip mb handling */
1890  if (s->mb_skip_run == -1) {
1891  /* read increment again */
1892  s->mb_skip_run = 0;
1893  for (;;) {
1894  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1895  MBINCR_VLC_BITS, 2);
1896  if (code < 0) {
1897  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1898  return -1;
1899  }
1900  if (code >= 33) {
1901  if (code == 33) {
1902  s->mb_skip_run += 33;
1903  } else if (code == 35) {
1904  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1905  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1906  return -1;
1907  }
1908  goto eos; /* end of slice */
1909  }
1910  /* otherwise, stuffing, nothing to do */
1911  } else {
1912  s->mb_skip_run += code;
1913  break;
1914  }
1915  }
1916  if (s->mb_skip_run) {
1917  int i;
1918  if (s->pict_type == AV_PICTURE_TYPE_I) {
1920  "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1921  return -1;
1922  }
1923 
1924  /* skip mb */
1925  s->mb_intra = 0;
1926  for (i = 0; i < 12; i++)
1927  s->block_last_index[i] = -1;
1929  s->mv_type = MV_TYPE_16X16;
1930  else
1931  s->mv_type = MV_TYPE_FIELD;
1932  if (s->pict_type == AV_PICTURE_TYPE_P) {
1933  /* if P type, zero motion vector is implied */
1934  s->mv_dir = MV_DIR_FORWARD;
1935  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1936  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1937  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1938  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1939  } else {
1940  /* if B type, reuse previous vectors and directions */
1941  s->mv[0][0][0] = s->last_mv[0][0][0];
1942  s->mv[0][0][1] = s->last_mv[0][0][1];
1943  s->mv[1][0][0] = s->last_mv[1][0][0];
1944  s->mv[1][0][1] = s->last_mv[1][0][1];
1945  }
1946  }
1947  }
1948  }
1949 eos: // end of slice
1950  if (get_bits_left(&s->gb) < 0)
1951  return AVERROR_INVALIDDATA;
1952  *buf += (get_bits_count(&s->gb) - 1) / 8;
1953  av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1954  return 0;
1955 }
1956 
1958 {
1959  MpegEncContext *s = *(void **) arg;
1960  const uint8_t *buf = s->gb.buffer;
1961  int mb_y = s->start_mb_y;
1962  const int field_pic = s->picture_structure != PICT_FRAME;
1963 
1964  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1965 
1966  for (;;) {
1967  uint32_t start_code;
1968  int ret;
1969 
1970  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1971  emms_c();
1972  av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1973  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1974  s->start_mb_y, s->end_mb_y, s->er.error_count);
1975  if (ret < 0) {
1976  if (c->err_recognition & AV_EF_EXPLODE)
1977  return ret;
1978  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1980  s->mb_x, s->mb_y,
1982  } else {
1984  s->mb_x - 1, s->mb_y,
1986  }
1987 
1988  if (s->mb_y == s->end_mb_y)
1989  return 0;
1990 
1991  start_code = -1;
1992  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1993  mb_y = start_code - SLICE_MIN_START_CODE;
1994  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1995  mb_y += (*buf&0xE0)<<2;
1996  mb_y <<= field_pic;
1998  mb_y++;
1999  if (mb_y < 0 || mb_y >= s->end_mb_y)
2000  return -1;
2001  }
2002 }
2003 
2004 /**
2005  * Handle slice ends.
2006  * @return 1 if it seems to be the last slice
2007  */
2008 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2009 {
2010  Mpeg1Context *s1 = avctx->priv_data;
2011  MpegEncContext *s = &s1->mpeg_enc_ctx;
2012 
2014  return 0;
2015 
2016  if (s->avctx->hwaccel) {
2017  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2018  av_log(avctx, AV_LOG_ERROR,
2019  "hardware accelerator failed to decode picture\n");
2020  }
2021 
2022  /* end of slice reached */
2023  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2024  /* end of image */
2025 
2026  ff_er_frame_end(&s->er);
2027 
2028  ff_MPV_frame_end(s);
2029 
2030  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2031  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2032  if (ret < 0)
2033  return ret;
2036  } else {
2037  if (avctx->active_thread_type & FF_THREAD_FRAME)
2038  s->picture_number++;
2039  /* latency of 1 frame for I- and P-frames */
2040  /* XXX: use another variable than picture_number */
2041  if (s->last_picture_ptr != NULL) {
2042  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2043  if (ret < 0)
2044  return ret;
2047  }
2048  }
2049 
2050  return 1;
2051  } else {
2052  return 0;
2053  }
2054 }
2055 
2057  const uint8_t *buf, int buf_size)
2058 {
2059  Mpeg1Context *s1 = avctx->priv_data;
2060  MpegEncContext *s = &s1->mpeg_enc_ctx;
2061  int width, height;
2062  int i, v, j;
2063 
2064  init_get_bits(&s->gb, buf, buf_size * 8);
2065 
2066  width = get_bits(&s->gb, 12);
2067  height = get_bits(&s->gb, 12);
2068  if (width == 0 || height == 0) {
2069  av_log(avctx, AV_LOG_WARNING,
2070  "Invalid horizontal or vertical size value.\n");
2072  return AVERROR_INVALIDDATA;
2073  }
2074  s->aspect_ratio_info = get_bits(&s->gb, 4);
2075  if (s->aspect_ratio_info == 0) {
2076  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2078  return -1;
2079  }
2080  s->frame_rate_index = get_bits(&s->gb, 4);
2081  if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2082  return -1;
2083  s->bit_rate = get_bits(&s->gb, 18) * 400;
2084  if (get_bits1(&s->gb) == 0) /* marker */
2085  return -1;
2086  s->width = width;
2087  s->height = height;
2088 
2089  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2090  skip_bits(&s->gb, 1);
2091 
2092  /* get matrix */
2093  if (get_bits1(&s->gb)) {
2095  } else {
2096  for (i = 0; i < 64; i++) {
2097  j = s->dsp.idct_permutation[i];
2099  s->intra_matrix[j] = v;
2100  s->chroma_intra_matrix[j] = v;
2101  }
2102  }
2103  if (get_bits1(&s->gb)) {
2105  } else {
2106  for (i = 0; i < 64; i++) {
2107  int j = s->dsp.idct_permutation[i];
2109  s->inter_matrix[j] = v;
2110  s->chroma_inter_matrix[j] = v;
2111  }
2112  }
2113 
2114  if (show_bits(&s->gb, 23) != 0) {
2115  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2116  return -1;
2117  }
2118 
2119  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2120  s->progressive_sequence = 1;
2121  s->progressive_frame = 1;
2123  s->first_field = 0;
2124  s->frame_pred_frame_dct = 1;
2125  s->chroma_format = 1;
2126  s->codec_id =
2128  s->out_format = FMT_MPEG1;
2129  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2130  if (s->flags & CODEC_FLAG_LOW_DELAY)
2131  s->low_delay = 1;
2132 
2133  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2134  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2135  s->avctx->rc_buffer_size, s->bit_rate);
2136 
2137  return 0;
2138 }
2139 
2141 {
2142  Mpeg1Context *s1 = avctx->priv_data;
2143  MpegEncContext *s = &s1->mpeg_enc_ctx;
2144  int i, v;
2145 
2146  /* start new MPEG-1 context decoding */
2147  s->out_format = FMT_MPEG1;
2148  if (s1->mpeg_enc_ctx_allocated) {
2149  ff_MPV_common_end(s);
2150  s1->mpeg_enc_ctx_allocated = 0;
2151  }
2152  s->width = avctx->coded_width;
2153  s->height = avctx->coded_height;
2154  avctx->has_b_frames = 0; // true?
2155  s->low_delay = 1;
2156 
2157  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2158  setup_hwaccel_for_pixfmt(avctx);
2159 
2160  if (ff_MPV_common_init(s) < 0)
2161  return -1;
2162  s1->mpeg_enc_ctx_allocated = 1;
2163 
2164  for (i = 0; i < 64; i++) {
2165  int j = s->dsp.idct_permutation[i];
2167  s->intra_matrix[j] = v;
2168  s->chroma_intra_matrix[j] = v;
2169 
2171  s->inter_matrix[j] = v;
2172  s->chroma_inter_matrix[j] = v;
2173  }
2174 
2175  s->progressive_sequence = 1;
2176  s->progressive_frame = 1;
2178  s->first_field = 0;
2179  s->frame_pred_frame_dct = 1;
2180  s->chroma_format = 1;
2181  if (s->codec_tag == AV_RL32("BW10")) {
2183  } else {
2184  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2186  }
2187  s1->save_width = s->width;
2188  s1->save_height = s->height;
2190  return 0;
2191 }
2192 
2194  const uint8_t *p, int buf_size)
2195 {
2196  Mpeg1Context *s1 = avctx->priv_data;
2197 
2198  if (buf_size >= 6 &&
2199  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2200  p[4] == 3 && (p[5] & 0x40)) {
2201  /* extract A53 Part 4 CC data */
2202  int cc_count = p[5] & 0x1f;
2203  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2204  av_freep(&s1->a53_caption);
2205  s1->a53_caption_size = cc_count * 3;
2207  if (s1->a53_caption)
2208  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2209  }
2210  return 1;
2211  } else if (buf_size >= 11 &&
2212  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2213  /* extract DVD CC data */
2214  int cc_count = 0;
2215  int i;
2216  // There is a caption count field in the data, but it is often
2217  // incorect. So count the number of captions present.
2218  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2219  cc_count++;
2220  // Transform the DVD format into A53 Part 4 format
2221  if (cc_count > 0) {
2222  av_freep(&s1->a53_caption);
2223  s1->a53_caption_size = cc_count * 6;
2225  if (s1->a53_caption) {
2226  uint8_t field1 = !!(p[4] & 0x80);
2227  uint8_t *cap = s1->a53_caption;
2228  p += 5;
2229  for (i = 0; i < cc_count; i++) {
2230  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2231  cap[1] = p[1];
2232  cap[2] = p[2];
2233  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2234  cap[4] = p[4];
2235  cap[5] = p[5];
2236  cap += 6;
2237  p += 6;
2238  }
2239  }
2240  }
2241  return 1;
2242  }
2243  return 0;
2244 }
2245 
2247  const uint8_t *p, int buf_size)
2248 {
2249  Mpeg1Context *s = avctx->priv_data;
2250  const uint8_t *buf_end = p + buf_size;
2251 
2252  if (buf_size > 29){
2253  int i;
2254  for(i=0; i<20; i++)
2255  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2256  s->tmpgexs= 1;
2257  }
2258 
2259 /* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2260  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2261  }
2262  av_log(avctx, AV_LOG_ERROR, "\n");*/
2263  }
2264 
2265  /* we parse the DTG active format information */
2266  if (buf_end - p >= 5 &&
2267  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2268  int flags = p[4];
2269  p += 5;
2270  if (flags & 0x80) {
2271  /* skip event id */
2272  p += 2;
2273  }
2274  if (flags & 0x40) {
2275  if (buf_end - p < 1)
2276  return;
2277  avctx->dtg_active_format = p[0] & 0x0f;
2278  }
2279  } else if (buf_end - p >= 6 &&
2280  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2281  p[4] == 0x03) { // S3D_video_format_length
2282  // the 0x7F mask ignores the reserved_bit value
2283  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2284 
2285  if (S3D_video_format_type == 0x03 ||
2286  S3D_video_format_type == 0x04 ||
2287  S3D_video_format_type == 0x08 ||
2288  S3D_video_format_type == 0x23) {
2289  Mpeg1Context *s1 = avctx->priv_data;
2290 
2291  s1->has_stereo3d = 1;
2292 
2293  switch (S3D_video_format_type) {
2294  case 0x03:
2296  break;
2297  case 0x04:
2299  break;
2300  case 0x08:
2302  break;
2303  case 0x23:
2305  break;
2306  }
2307  }
2308  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2309  return;
2310  }
2311 }
2312 
2313 static void mpeg_decode_gop(AVCodecContext *avctx,
2314  const uint8_t *buf, int buf_size)
2315 {
2316  Mpeg1Context *s1 = avctx->priv_data;
2317  MpegEncContext *s = &s1->mpeg_enc_ctx;
2318  int broken_link;
2319  int64_t tc;
2320 
2321  init_get_bits(&s->gb, buf, buf_size * 8);
2322 
2323  tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2324 
2325  s->closed_gop = get_bits1(&s->gb);
2326  /* broken_link indicate that after editing the
2327  * reference frames of the first B-Frames after GOP I-Frame
2328  * are missing (open gop) */
2329  broken_link = get_bits1(&s->gb);
2330 
2331  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2332  char tcbuf[AV_TIMECODE_STR_SIZE];
2335  "GOP (%s) closed_gop=%d broken_link=%d\n",
2336  tcbuf, s->closed_gop, broken_link);
2337  }
2338 }
2339 
2340 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2341  int *got_output, const uint8_t *buf, int buf_size)
2342 {
2343  Mpeg1Context *s = avctx->priv_data;
2345  const uint8_t *buf_ptr = buf;
2346  const uint8_t *buf_end = buf + buf_size;
2347  int ret, input_size;
2348  int last_code = 0, skip_frame = 0;
2349  int picture_start_code_seen = 0;
2350 
2351  for (;;) {
2352  /* find next start code */
2353  uint32_t start_code = -1;
2354  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2355  if (start_code > 0x1ff) {
2356  if (!skip_frame) {
2357  if (HAVE_THREADS &&
2358  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2359  !avctx->hwaccel) {
2360  int i;
2361  av_assert0(avctx->thread_count > 1);
2362 
2363  avctx->execute(avctx, slice_decode_thread,
2364  &s2->thread_context[0], NULL,
2365  s->slice_count, sizeof(void *));
2366  for (i = 0; i < s->slice_count; i++)
2367  s2->er.error_count += s2->thread_context[i]->er.error_count;
2368  }
2369 
2370  if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2371  && uses_vdpau(avctx))
2372  ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2373 
2374  ret = slice_end(avctx, picture);
2375  if (ret < 0)
2376  return ret;
2377  else if (ret) {
2378  // FIXME: merge with the stuff in mpeg_decode_slice
2379  if (s2->last_picture_ptr || s2->low_delay)
2380  *got_output = 1;
2381  }
2382  }
2383  s2->pict_type = 0;
2384 
2385  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2386  return AVERROR_INVALIDDATA;
2387 
2388  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2389  }
2390 
2391  input_size = buf_end - buf_ptr;
2392 
2393  if (avctx->debug & FF_DEBUG_STARTCODE)
2394  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
2395  start_code, buf_ptr - buf, input_size);
2396 
2397  /* prepare data for next start code */
2398  switch (start_code) {
2399  case SEQ_START_CODE:
2400  if (last_code == 0) {
2401  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2402  if (buf != avctx->extradata)
2403  s->sync = 1;
2404  } else {
2405  av_log(avctx, AV_LOG_ERROR,
2406  "ignoring SEQ_START_CODE after %X\n", last_code);
2407  if (avctx->err_recognition & AV_EF_EXPLODE)
2408  return AVERROR_INVALIDDATA;
2409  }
2410  break;
2411 
2412  case PICTURE_START_CODE:
2413  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2414  /* If it's a frame picture, there can't be more than one picture header.
2415  Yet, it does happen and we need to handle it. */
2416  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2417  break;
2418  }
2419  picture_start_code_seen = 1;
2420 
2421  if (s2->width <= 0 || s2->height <= 0) {
2422  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2423  s2->width, s2->height);
2424  return AVERROR_INVALIDDATA;
2425  }
2426 
2427  if (s->tmpgexs){
2428  s2->intra_dc_precision= 3;
2429  s2->intra_matrix[0]= 1;
2430  }
2431  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2432  !avctx->hwaccel && s->slice_count) {
2433  int i;
2434 
2435  avctx->execute(avctx, slice_decode_thread,
2436  s2->thread_context, NULL,
2437  s->slice_count, sizeof(void *));
2438  for (i = 0; i < s->slice_count; i++)
2439  s2->er.error_count += s2->thread_context[i]->er.error_count;
2440  s->slice_count = 0;
2441  }
2442  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2443  ret = mpeg_decode_postinit(avctx);
2444  if (ret < 0) {
2445  av_log(avctx, AV_LOG_ERROR,
2446  "mpeg_decode_postinit() failure\n");
2447  return ret;
2448  }
2449 
2450  /* We have a complete image: we try to decompress it. */
2451  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2452  s2->pict_type = 0;
2453  s->first_slice = 1;
2454  last_code = PICTURE_START_CODE;
2455  } else {
2456  av_log(avctx, AV_LOG_ERROR,
2457  "ignoring pic after %X\n", last_code);
2458  if (avctx->err_recognition & AV_EF_EXPLODE)
2459  return AVERROR_INVALIDDATA;
2460  }
2461  break;
2462  case EXT_START_CODE:
2463  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2464 
2465  switch (get_bits(&s2->gb, 4)) {
2466  case 0x1:
2467  if (last_code == 0) {
2469  } else {
2470  av_log(avctx, AV_LOG_ERROR,
2471  "ignoring seq ext after %X\n", last_code);
2472  if (avctx->err_recognition & AV_EF_EXPLODE)
2473  return AVERROR_INVALIDDATA;
2474  }
2475  break;
2476  case 0x2:
2478  break;
2479  case 0x3:
2481  break;
2482  case 0x7:
2484  break;
2485  case 0x8:
2486  if (last_code == PICTURE_START_CODE) {
2488  } else {
2489  av_log(avctx, AV_LOG_ERROR,
2490  "ignoring pic cod ext after %X\n", last_code);
2491  if (avctx->err_recognition & AV_EF_EXPLODE)
2492  return AVERROR_INVALIDDATA;
2493  }
2494  break;
2495  }
2496  break;
2497  case USER_START_CODE:
2498  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2499  break;
2500  case GOP_START_CODE:
2501  if (last_code == 0) {
2502  s2->first_field = 0;
2503  mpeg_decode_gop(avctx, buf_ptr, input_size);
2504  s->sync = 1;
2505  } else {
2506  av_log(avctx, AV_LOG_ERROR,
2507  "ignoring GOP_START_CODE after %X\n", last_code);
2508  if (avctx->err_recognition & AV_EF_EXPLODE)
2509  return AVERROR_INVALIDDATA;
2510  }
2511  break;
2512  default:
2513  if (start_code >= SLICE_MIN_START_CODE &&
2514  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2515  if (s2->progressive_sequence && !s2->progressive_frame) {
2516  s2->progressive_frame = 1;
2517  av_log(s2->avctx, AV_LOG_ERROR,
2518  "interlaced frame in progressive sequence, ignoring\n");
2519  }
2520 
2521  if (s2->picture_structure == 0 ||
2523  av_log(s2->avctx, AV_LOG_ERROR,
2524  "picture_structure %d invalid, ignoring\n",
2525  s2->picture_structure);
2527  }
2528 
2530  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2531 
2532  if (s2->picture_structure == PICT_FRAME) {
2533  s2->first_field = 0;
2534  s2->v_edge_pos = 16 * s2->mb_height;
2535  } else {
2536  s2->first_field ^= 1;
2537  s2->v_edge_pos = 8 * s2->mb_height;
2538  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2539  }
2540  }
2541  if (start_code >= SLICE_MIN_START_CODE &&
2542  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2543  const int field_pic = s2->picture_structure != PICT_FRAME;
2544  int mb_y = start_code - SLICE_MIN_START_CODE;
2545  last_code = SLICE_MIN_START_CODE;
2546  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2547  mb_y += (*buf_ptr&0xE0)<<2;
2548 
2549  mb_y <<= field_pic;
2551  mb_y++;
2552 
2553  if (buf_end - buf_ptr < 2) {
2554  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2555  return AVERROR_INVALIDDATA;
2556  }
2557 
2558  if (mb_y >= s2->mb_height) {
2559  av_log(s2->avctx, AV_LOG_ERROR,
2560  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2561  return -1;
2562  }
2563 
2564  if (s2->last_picture_ptr == NULL) {
2565  /* Skip B-frames if we do not have reference frames and
2566  * GOP is not closed. */
2567  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2568  if (!s2->closed_gop) {
2569  skip_frame = 1;
2570  break;
2571  }
2572  }
2573  }
2575  s->sync = 1;
2576  if (s2->next_picture_ptr == NULL) {
2577  /* Skip P-frames if we do not have a reference frame or
2578  * we have an invalid header. */
2579  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2580  skip_frame = 1;
2581  break;
2582  }
2583  }
2584  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2585  s2->pict_type == AV_PICTURE_TYPE_B) ||
2586  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2587  s2->pict_type != AV_PICTURE_TYPE_I) ||
2588  avctx->skip_frame >= AVDISCARD_ALL) {
2589  skip_frame = 1;
2590  break;
2591  }
2592 
2593  if (!s->mpeg_enc_ctx_allocated)
2594  break;
2595 
2596  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2597  if (mb_y < avctx->skip_top ||
2598  mb_y >= s2->mb_height - avctx->skip_bottom)
2599  break;
2600  }
2601 
2602  if (!s2->pict_type) {
2603  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2604  if (avctx->err_recognition & AV_EF_EXPLODE)
2605  return AVERROR_INVALIDDATA;
2606  break;
2607  }
2608 
2609  if (s->first_slice) {
2610  skip_frame = 0;
2611  s->first_slice = 0;
2612  if (mpeg_field_start(s2, buf, buf_size) < 0)
2613  return -1;
2614  }
2615  if (!s2->current_picture_ptr) {
2616  av_log(avctx, AV_LOG_ERROR,
2617  "current_picture not initialized\n");
2618  return AVERROR_INVALIDDATA;
2619  }
2620 
2621  if (uses_vdpau(avctx)) {
2622  s->slice_count++;
2623  break;
2624  }
2625 
2626  if (HAVE_THREADS &&
2627  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2628  !avctx->hwaccel) {
2629  int threshold = (s2->mb_height * s->slice_count +
2630  s2->slice_context_count / 2) /
2631  s2->slice_context_count;
2632  av_assert0(avctx->thread_count > 1);
2633  if (threshold <= mb_y) {
2634  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2635 
2636  thread_context->start_mb_y = mb_y;
2637  thread_context->end_mb_y = s2->mb_height;
2638  if (s->slice_count) {
2639  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2640  ret = ff_update_duplicate_context(thread_context, s2);
2641  if (ret < 0)
2642  return ret;
2643  }
2644  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2645  s->slice_count++;
2646  }
2647  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2648  } else {
2649  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2650  emms_c();
2651 
2652  if (ret < 0) {
2653  if (avctx->err_recognition & AV_EF_EXPLODE)
2654  return ret;
2655  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2656  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2657  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2659  } else {
2660  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2661  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2663  }
2664  }
2665  }
2666  break;
2667  }
2668  }
2669 }
2670 
2671 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2672  int *got_output, AVPacket *avpkt)
2673 {
2674  const uint8_t *buf = avpkt->data;
2675  int ret;
2676  int buf_size = avpkt->size;
2677  Mpeg1Context *s = avctx->priv_data;
2678  AVFrame *picture = data;
2680 
2681  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2682  /* special case for last picture */
2683  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2684  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2685  if (ret < 0)
2686  return ret;
2687 
2688  s2->next_picture_ptr = NULL;
2689 
2690  *got_output = 1;
2691  }
2692  return buf_size;
2693  }
2694 
2695  if (s2->flags & CODEC_FLAG_TRUNCATED) {
2696  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2697  buf_size, NULL);
2698 
2699  if (ff_combine_frame(&s2->parse_context, next,
2700  (const uint8_t **) &buf, &buf_size) < 0)
2701  return buf_size;
2702  }
2703 
2704  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2705  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2706  || s2->codec_tag == AV_RL32("BW10")
2707  ))
2708  vcr2_init_sequence(avctx);
2709 
2710  s->slice_count = 0;
2711 
2712  if (avctx->extradata && !s->extradata_decoded) {
2713  ret = decode_chunks(avctx, picture, got_output,
2714  avctx->extradata, avctx->extradata_size);
2715  if (*got_output) {
2716  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2717  *got_output = 0;
2718  }
2719  s->extradata_decoded = 1;
2720  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2721  s2->current_picture_ptr = NULL;
2722  return ret;
2723  }
2724  }
2725 
2726  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2727  if (ret<0 || *got_output)
2728  s2->current_picture_ptr = NULL;
2729 
2730  return ret;
2731 }
2732 
2733 static void flush(AVCodecContext *avctx)
2734 {
2735  Mpeg1Context *s = avctx->priv_data;
2736 
2737  s->sync = 0;
2738 
2739  ff_mpeg_flush(avctx);
2740 }
2741 
2743 {
2744  Mpeg1Context *s = avctx->priv_data;
2745 
2746  if (s->mpeg_enc_ctx_allocated)
2748  av_freep(&s->a53_caption);
2749  return 0;
2750 }
2751 
2753  { FF_PROFILE_MPEG2_422, "4:2:2" },
2754  { FF_PROFILE_MPEG2_HIGH, "High" },
2755  { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2756  { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2757  { FF_PROFILE_MPEG2_MAIN, "Main" },
2758  { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2759  { FF_PROFILE_RESERVED, "Reserved" },
2760  { FF_PROFILE_RESERVED, "Reserved" },
2761  { FF_PROFILE_UNKNOWN },
2762 };
2763 
2765  .name = "mpeg1video",
2766  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2767  .type = AVMEDIA_TYPE_VIDEO,
2768  .id = AV_CODEC_ID_MPEG1VIDEO,
2769  .priv_data_size = sizeof(Mpeg1Context),
2773  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2776  .flush = flush,
2777  .max_lowres = 3,
2779 };
2780 
2782  .name = "mpeg2video",
2783  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2784  .type = AVMEDIA_TYPE_VIDEO,
2785  .id = AV_CODEC_ID_MPEG2VIDEO,
2786  .priv_data_size = sizeof(Mpeg1Context),
2790  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2793  .flush = flush,
2794  .max_lowres = 3,
2795  .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2796 };
2797 
2798 //legacy decoder
2800  .name = "mpegvideo",
2801  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2802  .type = AVMEDIA_TYPE_VIDEO,
2803  .id = AV_CODEC_ID_MPEG2VIDEO,
2804  .priv_data_size = sizeof(Mpeg1Context),
2809  .flush = flush,
2810  .max_lowres = 3,
2811 };
2812 
2813 #if FF_API_XVMC
2814 #if CONFIG_MPEG_XVMC_DECODER
2815 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2816 {
2817  if (avctx->active_thread_type & FF_THREAD_SLICE)
2818  return -1;
2819  if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2820  return -1;
2821  if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2822  av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2823  }
2824  mpeg_decode_init(avctx);
2825 
2827  avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2828 
2829  return 0;
2830 }
2831 
2832 AVCodec ff_mpeg_xvmc_decoder = {
2833  .name = "mpegvideo_xvmc",
2834  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2835  .type = AVMEDIA_TYPE_VIDEO,
2836  .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2837  .priv_data_size = sizeof(Mpeg1Context),
2838  .init = mpeg_mc_decode_init,
2841  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2843  .flush = flush,
2844 };
2845 
2846 #endif
2847 #endif /* FF_API_XVMC */
2848 
2849 #if CONFIG_MPEG_VDPAU_DECODER
2850 AVCodec ff_mpeg_vdpau_decoder = {
2851  .name = "mpegvideo_vdpau",
2852  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2853  .type = AVMEDIA_TYPE_VIDEO,
2854  .id = AV_CODEC_ID_MPEG2VIDEO,
2855  .priv_data_size = sizeof(Mpeg1Context),
2859  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2861  .flush = flush,
2862 };
2863 #endif
2864 
2865 #if CONFIG_MPEG1_VDPAU_DECODER
2866 AVCodec ff_mpeg1_vdpau_decoder = {
2867  .name = "mpeg1video_vdpau",
2868  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2869  .type = AVMEDIA_TYPE_VIDEO,
2870  .id = AV_CODEC_ID_MPEG1VIDEO,
2871  .priv_data_size = sizeof(Mpeg1Context),
2875  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2877  .flush = flush,
2878 };
2879 #endif