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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 {
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 */
60  int has_afd;
64  AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
65  int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
66  int tmpgexs;
69 } Mpeg1Context;
70 
71 #define MB_TYPE_ZERO_MV 0x20000000
72 
73 static const uint32_t ptype2mb_type[7] = {
76  MB_TYPE_L0,
77  MB_TYPE_L0 | MB_TYPE_CBP,
80  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
81 };
82 
83 static const uint32_t btype2mb_type[11] = {
85  MB_TYPE_L1,
86  MB_TYPE_L1 | MB_TYPE_CBP,
87  MB_TYPE_L0,
88  MB_TYPE_L0 | MB_TYPE_CBP,
90  MB_TYPE_L0L1 | MB_TYPE_CBP,
92  MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
93  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
94  MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
95 };
96 
97 static const uint8_t non_linear_qscale[32] = {
98  0, 1, 2, 3, 4, 5, 6, 7,
99  8, 10, 12, 14, 16, 18, 20, 22,
100  24, 28, 32, 36, 40, 44, 48, 52,
101  56, 64, 72, 80, 88, 96, 104, 112,
102 };
103 
104 /* as H.263, but only 17 codes */
105 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
106 {
107  int code, sign, val, shift;
108 
109  code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
110  if (code == 0)
111  return pred;
112  if (code < 0)
113  return 0xffff;
114 
115  sign = get_bits1(&s->gb);
116  shift = fcode - 1;
117  val = code;
118  if (shift) {
119  val = (val - 1) << shift;
120  val |= get_bits(&s->gb, shift);
121  val++;
122  }
123  if (sign)
124  val = -val;
125  val += pred;
126 
127  /* modulo decoding */
128  return sign_extend(val, 5 + shift);
129 }
130 
131 #define check_scantable_index(ctx, x) \
132  do { \
133  if ((x) > 63) { \
134  av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
135  ctx->mb_x, ctx->mb_y); \
136  return AVERROR_INVALIDDATA; \
137  } \
138  } while (0)
139 
141  int16_t *block, int n)
142 {
143  int level, dc, diff, i, j, run;
144  int component;
145  RLTable *rl = &ff_rl_mpeg1;
146  uint8_t *const scantable = s->intra_scantable.permutated;
147  const uint16_t *quant_matrix = s->intra_matrix;
148  const int qscale = s->qscale;
149 
150  /* DC coefficient */
151  component = (n <= 3 ? 0 : n - 4 + 1);
152  diff = decode_dc(&s->gb, component);
153  if (diff >= 0xffff)
154  return -1;
155  dc = s->last_dc[component];
156  dc += diff;
157  s->last_dc[component] = dc;
158  block[0] = dc * quant_matrix[0];
159  av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
160  i = 0;
161  {
162  OPEN_READER(re, &s->gb);
163  UPDATE_CACHE(re, &s->gb);
164  if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
165  goto end;
166 
167  /* now quantify & encode AC coefficients */
168  for (;;) {
169  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
170  TEX_VLC_BITS, 2, 0);
171 
172  if (level != 0) {
173  i += run;
174  check_scantable_index(s, i);
175  j = scantable[i];
176  level = (level * qscale * quant_matrix[j]) >> 4;
177  level = (level - 1) | 1;
178  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
179  SHOW_SBITS(re, &s->gb, 1);
180  SKIP_BITS(re, &s->gb, 1);
181  } else {
182  /* escape */
183  run = SHOW_UBITS(re, &s->gb, 6) + 1;
184  LAST_SKIP_BITS(re, &s->gb, 6);
185  UPDATE_CACHE(re, &s->gb);
186  level = SHOW_SBITS(re, &s->gb, 8);
187  SKIP_BITS(re, &s->gb, 8);
188  if (level == -128) {
189  level = SHOW_UBITS(re, &s->gb, 8) - 256;
190  SKIP_BITS(re, &s->gb, 8);
191  } else if (level == 0) {
192  level = SHOW_UBITS(re, &s->gb, 8);
193  SKIP_BITS(re, &s->gb, 8);
194  }
195  i += run;
196  check_scantable_index(s, i);
197  j = scantable[i];
198  if (level < 0) {
199  level = -level;
200  level = (level * qscale * quant_matrix[j]) >> 4;
201  level = (level - 1) | 1;
202  level = -level;
203  } else {
204  level = (level * qscale * quant_matrix[j]) >> 4;
205  level = (level - 1) | 1;
206  }
207  }
208 
209  block[j] = level;
210  if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
211  break;
212 
213  UPDATE_CACHE(re, &s->gb);
214  }
215 end:
216  LAST_SKIP_BITS(re, &s->gb, 2);
217  CLOSE_READER(re, &s->gb);
218  }
219  s->block_last_index[n] = i;
220  return 0;
221 }
222 
224 {
225  return mpeg1_decode_block_intra(s, block, n);
226 }
227 
229  int16_t *block, int n)
230 {
231  int level, i, j, run;
232  RLTable *rl = &ff_rl_mpeg1;
233  uint8_t *const scantable = s->intra_scantable.permutated;
234  const uint16_t *quant_matrix = s->inter_matrix;
235  const int qscale = s->qscale;
236 
237  {
238  OPEN_READER(re, &s->gb);
239  i = -1;
240  // special case for first coefficient, no need to add second VLC table
241  UPDATE_CACHE(re, &s->gb);
242  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
243  level = (3 * qscale * quant_matrix[0]) >> 5;
244  level = (level - 1) | 1;
245  if (GET_CACHE(re, &s->gb) & 0x40000000)
246  level = -level;
247  block[0] = level;
248  i++;
249  SKIP_BITS(re, &s->gb, 2);
250  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
251  goto end;
252  }
253  /* now quantify & encode AC coefficients */
254  for (;;) {
255  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
256  TEX_VLC_BITS, 2, 0);
257 
258  if (level != 0) {
259  i += run;
260  check_scantable_index(s, i);
261  j = scantable[i];
262  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
263  level = (level - 1) | 1;
264  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265  SHOW_SBITS(re, &s->gb, 1);
266  SKIP_BITS(re, &s->gb, 1);
267  } else {
268  /* escape */
269  run = SHOW_UBITS(re, &s->gb, 6) + 1;
270  LAST_SKIP_BITS(re, &s->gb, 6);
271  UPDATE_CACHE(re, &s->gb);
272  level = SHOW_SBITS(re, &s->gb, 8);
273  SKIP_BITS(re, &s->gb, 8);
274  if (level == -128) {
275  level = SHOW_UBITS(re, &s->gb, 8) - 256;
276  SKIP_BITS(re, &s->gb, 8);
277  } else if (level == 0) {
278  level = SHOW_UBITS(re, &s->gb, 8);
279  SKIP_BITS(re, &s->gb, 8);
280  }
281  i += run;
282  check_scantable_index(s, i);
283  j = scantable[i];
284  if (level < 0) {
285  level = -level;
286  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
287  level = (level - 1) | 1;
288  level = -level;
289  } else {
290  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
291  level = (level - 1) | 1;
292  }
293  }
294 
295  block[j] = level;
296  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
297  break;
298  UPDATE_CACHE(re, &s->gb);
299  }
300 end:
301  LAST_SKIP_BITS(re, &s->gb, 2);
302  CLOSE_READER(re, &s->gb);
303  }
304  s->block_last_index[n] = i;
305  return 0;
306 }
307 
308 /**
309  * Note: this function can read out of range and crash for corrupt streams.
310  * Changing this would eat up any speed benefits it has.
311  * Do not use "fast" flag if you need the code to be robust.
312  */
314  int16_t *block, int n)
315 {
316  int level, i, j, run;
317  RLTable *rl = &ff_rl_mpeg1;
318  uint8_t *const scantable = s->intra_scantable.permutated;
319  const int qscale = s->qscale;
320 
321  {
322  OPEN_READER(re, &s->gb);
323  i = -1;
324  // Special case for first coefficient, no need to add second VLC table.
325  UPDATE_CACHE(re, &s->gb);
326  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
327  level = (3 * qscale) >> 1;
328  level = (level - 1) | 1;
329  if (GET_CACHE(re, &s->gb) & 0x40000000)
330  level = -level;
331  block[0] = level;
332  i++;
333  SKIP_BITS(re, &s->gb, 2);
334  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
335  goto end;
336  }
337 
338  /* now quantify & encode AC coefficients */
339  for (;;) {
340  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
341  TEX_VLC_BITS, 2, 0);
342 
343  if (level != 0) {
344  i += run;
345  check_scantable_index(s, i);
346  j = scantable[i];
347  level = ((level * 2 + 1) * qscale) >> 1;
348  level = (level - 1) | 1;
349  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
350  SHOW_SBITS(re, &s->gb, 1);
351  SKIP_BITS(re, &s->gb, 1);
352  } else {
353  /* escape */
354  run = SHOW_UBITS(re, &s->gb, 6) + 1;
355  LAST_SKIP_BITS(re, &s->gb, 6);
356  UPDATE_CACHE(re, &s->gb);
357  level = SHOW_SBITS(re, &s->gb, 8);
358  SKIP_BITS(re, &s->gb, 8);
359  if (level == -128) {
360  level = SHOW_UBITS(re, &s->gb, 8) - 256;
361  SKIP_BITS(re, &s->gb, 8);
362  } else if (level == 0) {
363  level = SHOW_UBITS(re, &s->gb, 8);
364  SKIP_BITS(re, &s->gb, 8);
365  }
366  i += run;
367  check_scantable_index(s, i);
368  j = scantable[i];
369  if (level < 0) {
370  level = -level;
371  level = ((level * 2 + 1) * qscale) >> 1;
372  level = (level - 1) | 1;
373  level = -level;
374  } else {
375  level = ((level * 2 + 1) * qscale) >> 1;
376  level = (level - 1) | 1;
377  }
378  }
379 
380  block[j] = level;
381  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
382  break;
383  UPDATE_CACHE(re, &s->gb);
384  }
385 end:
386  LAST_SKIP_BITS(re, &s->gb, 2);
387  CLOSE_READER(re, &s->gb);
388  }
389  s->block_last_index[n] = i;
390  return 0;
391 }
392 
394  int16_t *block, int n)
395 {
396  int level, i, j, run;
397  RLTable *rl = &ff_rl_mpeg1;
398  uint8_t *const scantable = s->intra_scantable.permutated;
399  const uint16_t *quant_matrix;
400  const int qscale = s->qscale;
401  int mismatch;
402 
403  mismatch = 1;
404 
405  {
406  OPEN_READER(re, &s->gb);
407  i = -1;
408  if (n < 4)
409  quant_matrix = s->inter_matrix;
410  else
411  quant_matrix = s->chroma_inter_matrix;
412 
413  // Special case for first coefficient, no need to add second VLC table.
414  UPDATE_CACHE(re, &s->gb);
415  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416  level = (3 * qscale * quant_matrix[0]) >> 5;
417  if (GET_CACHE(re, &s->gb) & 0x40000000)
418  level = -level;
419  block[0] = level;
420  mismatch ^= level;
421  i++;
422  SKIP_BITS(re, &s->gb, 2);
423  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
424  goto end;
425  }
426 
427  /* now quantify & encode AC coefficients */
428  for (;;) {
429  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
430  TEX_VLC_BITS, 2, 0);
431 
432  if (level != 0) {
433  i += run;
434  check_scantable_index(s, i);
435  j = scantable[i];
436  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
437  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
438  SHOW_SBITS(re, &s->gb, 1);
439  SKIP_BITS(re, &s->gb, 1);
440  } else {
441  /* escape */
442  run = SHOW_UBITS(re, &s->gb, 6) + 1;
443  LAST_SKIP_BITS(re, &s->gb, 6);
444  UPDATE_CACHE(re, &s->gb);
445  level = SHOW_SBITS(re, &s->gb, 12);
446  SKIP_BITS(re, &s->gb, 12);
447 
448  i += run;
449  check_scantable_index(s, i);
450  j = scantable[i];
451  if (level < 0) {
452  level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
453  level = -level;
454  } else {
455  level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
456  }
457  }
458 
459  mismatch ^= level;
460  block[j] = level;
461  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
462  break;
463  UPDATE_CACHE(re, &s->gb);
464  }
465 end:
466  LAST_SKIP_BITS(re, &s->gb, 2);
467  CLOSE_READER(re, &s->gb);
468  }
469  block[63] ^= (mismatch & 1);
470 
471  s->block_last_index[n] = i;
472  return 0;
473 }
474 
475 /**
476  * Note: this function can read out of range and crash for corrupt streams.
477  * Changing this would eat up any speed benefits it has.
478  * Do not use "fast" flag if you need the code to be robust.
479  */
481  int16_t *block, int n)
482 {
483  int level, i, j, run;
484  RLTable *rl = &ff_rl_mpeg1;
485  uint8_t *const scantable = s->intra_scantable.permutated;
486  const int qscale = s->qscale;
487  OPEN_READER(re, &s->gb);
488  i = -1;
489 
490  // special case for first coefficient, no need to add second VLC table
491  UPDATE_CACHE(re, &s->gb);
492  if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
493  level = (3 * qscale) >> 1;
494  if (GET_CACHE(re, &s->gb) & 0x40000000)
495  level = -level;
496  block[0] = level;
497  i++;
498  SKIP_BITS(re, &s->gb, 2);
499  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
500  goto end;
501  }
502 
503  /* now quantify & encode AC coefficients */
504  for (;;) {
505  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
506 
507  if (level != 0) {
508  i += run;
509  j = scantable[i];
510  level = ((level * 2 + 1) * qscale) >> 1;
511  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
512  SHOW_SBITS(re, &s->gb, 1);
513  SKIP_BITS(re, &s->gb, 1);
514  } else {
515  /* escape */
516  run = SHOW_UBITS(re, &s->gb, 6) + 1;
517  LAST_SKIP_BITS(re, &s->gb, 6);
518  UPDATE_CACHE(re, &s->gb);
519  level = SHOW_SBITS(re, &s->gb, 12);
520  SKIP_BITS(re, &s->gb, 12);
521 
522  i += run;
523  j = scantable[i];
524  if (level < 0) {
525  level = ((-level * 2 + 1) * qscale) >> 1;
526  level = -level;
527  } else {
528  level = ((level * 2 + 1) * qscale) >> 1;
529  }
530  }
531 
532  block[j] = level;
533  if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
534  break;
535 
536  UPDATE_CACHE(re, &s->gb);
537  }
538 end:
539  LAST_SKIP_BITS(re, &s->gb, 2);
540  CLOSE_READER(re, &s->gb);
541  s->block_last_index[n] = i;
542  return 0;
543 }
544 
546  int16_t *block, int n)
547 {
548  int level, dc, diff, i, j, run;
549  int component;
550  RLTable *rl;
551  uint8_t *const scantable = s->intra_scantable.permutated;
552  const uint16_t *quant_matrix;
553  const int qscale = s->qscale;
554  int mismatch;
555 
556  /* DC coefficient */
557  if (n < 4) {
558  quant_matrix = s->intra_matrix;
559  component = 0;
560  } else {
561  quant_matrix = s->chroma_intra_matrix;
562  component = (n & 1) + 1;
563  }
564  diff = decode_dc(&s->gb, component);
565  if (diff >= 0xffff)
566  return -1;
567  dc = s->last_dc[component];
568  dc += diff;
569  s->last_dc[component] = dc;
570  block[0] = dc << (3 - s->intra_dc_precision);
571  av_dlog(s->avctx, "dc=%d\n", block[0]);
572  mismatch = block[0] ^ 1;
573  i = 0;
574  if (s->intra_vlc_format)
575  rl = &ff_rl_mpeg2;
576  else
577  rl = &ff_rl_mpeg1;
578 
579  {
580  OPEN_READER(re, &s->gb);
581  /* now quantify & encode AC coefficients */
582  for (;;) {
583  UPDATE_CACHE(re, &s->gb);
584  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
585  TEX_VLC_BITS, 2, 0);
586 
587  if (level == 127) {
588  break;
589  } else if (level != 0) {
590  i += run;
591  check_scantable_index(s, i);
592  j = scantable[i];
593  level = (level * qscale * quant_matrix[j]) >> 4;
594  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
595  SHOW_SBITS(re, &s->gb, 1);
596  LAST_SKIP_BITS(re, &s->gb, 1);
597  } else {
598  /* escape */
599  run = SHOW_UBITS(re, &s->gb, 6) + 1;
600  LAST_SKIP_BITS(re, &s->gb, 6);
601  UPDATE_CACHE(re, &s->gb);
602  level = SHOW_SBITS(re, &s->gb, 12);
603  SKIP_BITS(re, &s->gb, 12);
604  i += run;
605  check_scantable_index(s, i);
606  j = scantable[i];
607  if (level < 0) {
608  level = (-level * qscale * quant_matrix[j]) >> 4;
609  level = -level;
610  } else {
611  level = (level * qscale * quant_matrix[j]) >> 4;
612  }
613  }
614 
615  mismatch ^= level;
616  block[j] = level;
617  }
618  CLOSE_READER(re, &s->gb);
619  }
620  block[63] ^= mismatch & 1;
621 
622  s->block_last_index[n] = i;
623  return 0;
624 }
625 
626 /**
627  * Note: this function can read out of range and crash for corrupt streams.
628  * Changing this would eat up any speed benefits it has.
629  * Do not use "fast" flag if you need the code to be robust.
630  */
632  int16_t *block, int n)
633 {
634  int level, dc, diff, i, j, run;
635  int component;
636  RLTable *rl;
637  uint8_t *const scantable = s->intra_scantable.permutated;
638  const uint16_t *quant_matrix;
639  const int qscale = s->qscale;
640 
641  /* DC coefficient */
642  if (n < 4) {
643  quant_matrix = s->intra_matrix;
644  component = 0;
645  } else {
646  quant_matrix = s->chroma_intra_matrix;
647  component = (n & 1) + 1;
648  }
649  diff = decode_dc(&s->gb, component);
650  if (diff >= 0xffff)
651  return -1;
652  dc = s->last_dc[component];
653  dc += diff;
654  s->last_dc[component] = dc;
655  block[0] = dc << (3 - s->intra_dc_precision);
656  i = 0;
657  if (s->intra_vlc_format)
658  rl = &ff_rl_mpeg2;
659  else
660  rl = &ff_rl_mpeg1;
661 
662  {
663  OPEN_READER(re, &s->gb);
664  /* now quantify & encode AC coefficients */
665  for (;;) {
666  UPDATE_CACHE(re, &s->gb);
667  GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
668  TEX_VLC_BITS, 2, 0);
669 
670  if (level >= 64 || i > 63) {
671  break;
672  } else if (level != 0) {
673  i += run;
674  j = scantable[i];
675  level = (level * qscale * quant_matrix[j]) >> 4;
676  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
677  SHOW_SBITS(re, &s->gb, 1);
678  LAST_SKIP_BITS(re, &s->gb, 1);
679  } else {
680  /* escape */
681  run = SHOW_UBITS(re, &s->gb, 6) + 1;
682  LAST_SKIP_BITS(re, &s->gb, 6);
683  UPDATE_CACHE(re, &s->gb);
684  level = SHOW_SBITS(re, &s->gb, 12);
685  SKIP_BITS(re, &s->gb, 12);
686  i += run;
687  j = scantable[i];
688  if (level < 0) {
689  level = (-level * qscale * quant_matrix[j]) >> 4;
690  level = -level;
691  } else {
692  level = (level * qscale * quant_matrix[j]) >> 4;
693  }
694  }
695 
696  block[j] = level;
697  }
698  CLOSE_READER(re, &s->gb);
699  }
700 
701  s->block_last_index[n] = i;
702  return 0;
703 }
704 
705 /******************************************/
706 /* decoding */
707 
708 static inline int get_dmv(MpegEncContext *s)
709 {
710  if (get_bits1(&s->gb))
711  return 1 - (get_bits1(&s->gb) << 1);
712  else
713  return 0;
714 }
715 
716 static inline int get_qscale(MpegEncContext *s)
717 {
718  int qscale = get_bits(&s->gb, 5);
719  if (s->q_scale_type)
720  return non_linear_qscale[qscale];
721  else
722  return qscale << 1;
723 }
724 
725 
726 /* motion type (for MPEG-2) */
727 #define MT_FIELD 1
728 #define MT_FRAME 2
729 #define MT_16X8 2
730 #define MT_DMV 3
731 
732 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
733 {
734  int i, j, k, cbp, val, mb_type, motion_type;
735  const int mb_block_count = 4 + (1 << s->chroma_format);
736 
737  av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
738 
739  av_assert2(s->mb_skipped == 0);
740 
741  if (s->mb_skip_run-- != 0) {
742  if (s->pict_type == AV_PICTURE_TYPE_P) {
743  s->mb_skipped = 1;
744  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
746  } else {
747  int mb_type;
748 
749  if (s->mb_x)
750  mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
751  else
752  // FIXME not sure if this is allowed in MPEG at all
753  mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
754  if (IS_INTRA(mb_type)) {
755  av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
756  return -1;
757  }
758  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
759  mb_type | MB_TYPE_SKIP;
760 
761  if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
762  s->mb_skipped = 1;
763  }
764 
765  return 0;
766  }
767 
768  switch (s->pict_type) {
769  default:
770  case AV_PICTURE_TYPE_I:
771  if (get_bits1(&s->gb) == 0) {
772  if (get_bits1(&s->gb) == 0) {
774  "invalid mb type in I Frame at %d %d\n",
775  s->mb_x, s->mb_y);
776  return -1;
777  }
778  mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
779  } else {
780  mb_type = MB_TYPE_INTRA;
781  }
782  break;
783  case AV_PICTURE_TYPE_P:
784  mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
785  if (mb_type < 0) {
787  "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
788  return -1;
789  }
790  mb_type = ptype2mb_type[mb_type];
791  break;
792  case AV_PICTURE_TYPE_B:
793  mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
794  if (mb_type < 0) {
796  "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
797  return -1;
798  }
799  mb_type = btype2mb_type[mb_type];
800  break;
801  }
802  av_dlog(s->avctx, "mb_type=%x\n", mb_type);
803 // motion_type = 0; /* avoid warning */
804  if (IS_INTRA(mb_type)) {
805  s->bdsp.clear_blocks(s->block[0]);
806 
807  if (!s->chroma_y_shift)
808  s->bdsp.clear_blocks(s->block[6]);
809 
810  /* compute DCT type */
811  // FIXME: add an interlaced_dct coded var?
812  if (s->picture_structure == PICT_FRAME &&
814  s->interlaced_dct = get_bits1(&s->gb);
815 
816  if (IS_QUANT(mb_type))
817  s->qscale = get_qscale(s);
818 
820  /* just parse them */
821  if (s->picture_structure != PICT_FRAME)
822  skip_bits1(&s->gb); /* field select */
823 
824  s->mv[0][0][0] =
825  s->last_mv[0][0][0] =
826  s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
827  s->last_mv[0][0][0]);
828  s->mv[0][0][1] =
829  s->last_mv[0][0][1] =
830  s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
831  s->last_mv[0][0][1]);
832 
833  skip_bits1(&s->gb); /* marker */
834  } else {
835  /* reset mv prediction */
836  memset(s->last_mv, 0, sizeof(s->last_mv));
837  }
838  s->mb_intra = 1;
839  // if 1, we memcpy blocks in xvmcvideo
840  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
841  ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
842 
843  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
844  if (s->flags2 & CODEC_FLAG2_FAST) {
845  for (i = 0; i < 6; i++)
847  } else {
848  for (i = 0; i < mb_block_count; i++)
849  if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
850  return -1;
851  }
852  } else {
853  for (i = 0; i < 6; i++)
854  if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
855  return -1;
856  }
857  } else {
858  if (mb_type & MB_TYPE_ZERO_MV) {
859  av_assert2(mb_type & MB_TYPE_CBP);
860 
861  s->mv_dir = MV_DIR_FORWARD;
862  if (s->picture_structure == PICT_FRAME) {
863  if (s->picture_structure == PICT_FRAME
864  && !s->frame_pred_frame_dct)
865  s->interlaced_dct = get_bits1(&s->gb);
866  s->mv_type = MV_TYPE_16X16;
867  } else {
868  s->mv_type = MV_TYPE_FIELD;
869  mb_type |= MB_TYPE_INTERLACED;
870  s->field_select[0][0] = s->picture_structure - 1;
871  }
872 
873  if (IS_QUANT(mb_type))
874  s->qscale = get_qscale(s);
875 
876  s->last_mv[0][0][0] = 0;
877  s->last_mv[0][0][1] = 0;
878  s->last_mv[0][1][0] = 0;
879  s->last_mv[0][1][1] = 0;
880  s->mv[0][0][0] = 0;
881  s->mv[0][0][1] = 0;
882  } else {
883  av_assert2(mb_type & MB_TYPE_L0L1);
884  // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
885  /* get additional motion vector type */
887  motion_type = MT_FRAME;
888  } else {
889  motion_type = get_bits(&s->gb, 2);
890  if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
891  s->interlaced_dct = get_bits1(&s->gb);
892  }
893 
894  if (IS_QUANT(mb_type))
895  s->qscale = get_qscale(s);
896 
897  /* motion vectors */
898  s->mv_dir = (mb_type >> 13) & 3;
899  av_dlog(s->avctx, "motion_type=%d\n", motion_type);
900  switch (motion_type) {
901  case MT_FRAME: /* or MT_16X8 */
902  if (s->picture_structure == PICT_FRAME) {
903  mb_type |= MB_TYPE_16x16;
904  s->mv_type = MV_TYPE_16X16;
905  for (i = 0; i < 2; i++) {
906  if (USES_LIST(mb_type, i)) {
907  /* MT_FRAME */
908  s->mv[i][0][0] =
909  s->last_mv[i][0][0] =
910  s->last_mv[i][1][0] =
911  mpeg_decode_motion(s, s->mpeg_f_code[i][0],
912  s->last_mv[i][0][0]);
913  s->mv[i][0][1] =
914  s->last_mv[i][0][1] =
915  s->last_mv[i][1][1] =
916  mpeg_decode_motion(s, s->mpeg_f_code[i][1],
917  s->last_mv[i][0][1]);
918  /* full_pel: only for MPEG-1 */
919  if (s->full_pel[i]) {
920  s->mv[i][0][0] <<= 1;
921  s->mv[i][0][1] <<= 1;
922  }
923  }
924  }
925  } else {
926  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
927  s->mv_type = MV_TYPE_16X8;
928  for (i = 0; i < 2; i++) {
929  if (USES_LIST(mb_type, i)) {
930  /* MT_16X8 */
931  for (j = 0; j < 2; j++) {
932  s->field_select[i][j] = get_bits1(&s->gb);
933  for (k = 0; k < 2; k++) {
934  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
935  s->last_mv[i][j][k]);
936  s->last_mv[i][j][k] = val;
937  s->mv[i][j][k] = val;
938  }
939  }
940  }
941  }
942  }
943  break;
944  case MT_FIELD:
945  s->mv_type = MV_TYPE_FIELD;
946  if (s->picture_structure == PICT_FRAME) {
947  mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
948  for (i = 0; i < 2; i++) {
949  if (USES_LIST(mb_type, i)) {
950  for (j = 0; j < 2; j++) {
951  s->field_select[i][j] = get_bits1(&s->gb);
952  val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
953  s->last_mv[i][j][0]);
954  s->last_mv[i][j][0] = val;
955  s->mv[i][j][0] = val;
956  av_dlog(s->avctx, "fmx=%d\n", val);
957  val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
958  s->last_mv[i][j][1] >> 1);
959  s->last_mv[i][j][1] = val << 1;
960  s->mv[i][j][1] = val;
961  av_dlog(s->avctx, "fmy=%d\n", val);
962  }
963  }
964  }
965  } else {
967  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
968  for (i = 0; i < 2; i++) {
969  if (USES_LIST(mb_type, i)) {
970  s->field_select[i][0] = get_bits1(&s->gb);
971  for (k = 0; k < 2; k++) {
972  val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
973  s->last_mv[i][0][k]);
974  s->last_mv[i][0][k] = val;
975  s->last_mv[i][1][k] = val;
976  s->mv[i][0][k] = val;
977  }
978  }
979  }
980  }
981  break;
982  case MT_DMV:
983  if (s->progressive_sequence){
984  av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
985  return -1;
986  }
987  s->mv_type = MV_TYPE_DMV;
988  for (i = 0; i < 2; i++) {
989  if (USES_LIST(mb_type, i)) {
990  int dmx, dmy, mx, my, m;
991  const int my_shift = s->picture_structure == PICT_FRAME;
992 
993  mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
994  s->last_mv[i][0][0]);
995  s->last_mv[i][0][0] = mx;
996  s->last_mv[i][1][0] = mx;
997  dmx = get_dmv(s);
998  my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
999  s->last_mv[i][0][1] >> my_shift);
1000  dmy = get_dmv(s);
1001 
1002 
1003  s->last_mv[i][0][1] = my << my_shift;
1004  s->last_mv[i][1][1] = my << my_shift;
1005 
1006  s->mv[i][0][0] = mx;
1007  s->mv[i][0][1] = my;
1008  s->mv[i][1][0] = mx; // not used
1009  s->mv[i][1][1] = my; // not used
1010 
1011  if (s->picture_structure == PICT_FRAME) {
1012  mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1013 
1014  // m = 1 + 2 * s->top_field_first;
1015  m = s->top_field_first ? 1 : 3;
1016 
1017  /* top -> top pred */
1018  s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1019  s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1020  m = 4 - m;
1021  s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1022  s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1023  } else {
1024  mb_type |= MB_TYPE_16x16;
1025 
1026  s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1027  s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1029  s->mv[i][2][1]--;
1030  else
1031  s->mv[i][2][1]++;
1032  }
1033  }
1034  }
1035  break;
1036  default:
1038  "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1039  return -1;
1040  }
1041  }
1042 
1043  s->mb_intra = 0;
1044  if (HAS_CBP(mb_type)) {
1045  s->bdsp.clear_blocks(s->block[0]);
1046 
1047  cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1048  if (mb_block_count > 6) {
1049  cbp <<= mb_block_count - 6;
1050  cbp |= get_bits(&s->gb, mb_block_count - 6);
1051  s->bdsp.clear_blocks(s->block[6]);
1052  }
1053  if (cbp <= 0) {
1055  "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1056  return -1;
1057  }
1058 
1059  // if 1, we memcpy blocks in xvmcvideo
1060  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1061  ff_xvmc_pack_pblocks(s, cbp);
1062 
1063  if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1064  if (s->flags2 & CODEC_FLAG2_FAST) {
1065  for (i = 0; i < 6; i++) {
1066  if (cbp & 32)
1068  else
1069  s->block_last_index[i] = -1;
1070  cbp += cbp;
1071  }
1072  } else {
1073  cbp <<= 12 - mb_block_count;
1074 
1075  for (i = 0; i < mb_block_count; i++) {
1076  if (cbp & (1 << 11)) {
1077  if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1078  return -1;
1079  } else {
1080  s->block_last_index[i] = -1;
1081  }
1082  cbp += cbp;
1083  }
1084  }
1085  } else {
1086  if (s->flags2 & CODEC_FLAG2_FAST) {
1087  for (i = 0; i < 6; i++) {
1088  if (cbp & 32)
1089  mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1090  else
1091  s->block_last_index[i] = -1;
1092  cbp += cbp;
1093  }
1094  } else {
1095  for (i = 0; i < 6; i++) {
1096  if (cbp & 32) {
1097  if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1098  return -1;
1099  } else {
1100  s->block_last_index[i] = -1;
1101  }
1102  cbp += cbp;
1103  }
1104  }
1105  }
1106  } else {
1107  for (i = 0; i < 12; i++)
1108  s->block_last_index[i] = -1;
1109  }
1110  }
1111 
1112  s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1113 
1114  return 0;
1115 }
1116 
1118 {
1119  Mpeg1Context *s = avctx->priv_data;
1121 
1123  ff_mpv_decode_init(s2, avctx);
1124 
1125  s->mpeg_enc_ctx.avctx = avctx;
1126 
1127  /* we need some permutation to store matrices,
1128  * until the decoder sets the real permutation. */
1129  ff_mpv_idct_init(s2);
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 const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1215 };
1216 
1217 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1220 };
1221 
1222 static inline int uses_vdpau(AVCodecContext *avctx) {
1223  return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1224 }
1225 
1227 {
1228  Mpeg1Context *s1 = avctx->priv_data;
1229  MpegEncContext *s = &s1->mpeg_enc_ctx;
1230  const enum AVPixelFormat *pix_fmts;
1231 
1232  if (s->chroma_format < 2)
1233  pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1236  else if (s->chroma_format == 2)
1237  pix_fmts = mpeg12_pixfmt_list_422;
1238  else
1239  pix_fmts = mpeg12_pixfmt_list_444;
1240 
1241  return ff_thread_get_format(avctx, pix_fmts);
1242 }
1243 
1245 {
1246  // until then pix_fmt may be changed right after codec init
1247  if (avctx->hwaccel || uses_vdpau(avctx))
1248  if (avctx->idct_algo == FF_IDCT_AUTO)
1249  avctx->idct_algo = FF_IDCT_SIMPLE;
1250 
1251  if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1252  Mpeg1Context *s1 = avctx->priv_data;
1253  MpegEncContext *s = &s1->mpeg_enc_ctx;
1254 
1255  s->pack_pblocks = 1;
1256 #if FF_API_XVMC
1257  avctx->xvmc_acceleration = 2;
1258 #endif /* FF_API_XVMC */
1259  }
1260 }
1261 
1262 /* Call this function when we know all parameters.
1263  * It may be called in different places for MPEG-1 and MPEG-2. */
1265 {
1266  Mpeg1Context *s1 = avctx->priv_data;
1267  MpegEncContext *s = &s1->mpeg_enc_ctx;
1268  uint8_t old_permutation[64];
1269  int ret;
1270 
1271  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1272  avctx->coded_width != s->width ||
1273  avctx->coded_height != s->height ||
1274  s1->save_width != s->width ||
1275  s1->save_height != s->height ||
1276  s1->save_aspect_info != s->aspect_ratio_info ||
1277  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1278  0) {
1279  if (s1->mpeg_enc_ctx_allocated) {
1280  ParseContext pc = s->parse_context;
1281  s->parse_context.buffer = 0;
1282  ff_mpv_common_end(s);
1283  s->parse_context = pc;
1284  s1->mpeg_enc_ctx_allocated = 0;
1285  }
1286 
1287  if ((s->width == 0) || (s->height == 0))
1288  return -2;
1289 
1290  ret = ff_set_dimensions(avctx, s->width, s->height);
1291  if (ret < 0)
1292  return ret;
1293 
1294  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1295  avctx->rc_max_rate = s->bit_rate;
1296  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1297  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1298  avctx->bit_rate = s->bit_rate;
1299  }
1301  s1->save_width = s->width;
1302  s1->save_height = s->height;
1304 
1305  /* low_delay may be forced, in this case we will have B-frames
1306  * that behave like P-frames. */
1307  avctx->has_b_frames = !s->low_delay;
1308 
1309  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1310  // MPEG-1 fps
1312  // MPEG-1 aspect
1314  avctx->ticks_per_frame = 1;
1315  } else { // MPEG-2
1316  // MPEG-2 fps
1318  &s->avctx->framerate.den,
1321  1 << 30);
1322  avctx->ticks_per_frame = 2;
1323  // MPEG-2 aspect
1324  if (s->aspect_ratio_info > 1) {
1325  AVRational dar =
1327  (AVRational) { s1->pan_scan.width,
1328  s1->pan_scan.height }),
1329  (AVRational) { s->width, s->height });
1330 
1331  /* We ignore the spec here and guess a bit as reality does not
1332  * match the spec, see for example res_change_ffmpeg_aspect.ts
1333  * and sequence-display-aspect.mpg.
1334  * issue1613, 621, 562 */
1335  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1336  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1337  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1340  (AVRational) { s->width, s->height });
1341  } else {
1344  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1345 // issue1613 4/3 16/9 -> 16/9
1346 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1347 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1348 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1349  av_dlog(avctx, "A %d/%d\n",
1352  av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1354  }
1355  } else {
1356  s->avctx->sample_aspect_ratio =
1357  ff_mpeg2_aspect[s->aspect_ratio_info];
1358  }
1359  } // MPEG-2
1360 
1361  ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1362 
1363  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1364  setup_hwaccel_for_pixfmt(avctx);
1365 
1366  /* Quantization matrices may need reordering
1367  * if DCT permutation is changed. */
1368  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1369 
1371  if (ff_mpv_common_init(s) < 0)
1372  return -2;
1373 
1374  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1375  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1376  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1377  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1378 
1379  s1->mpeg_enc_ctx_allocated = 1;
1380  }
1381  return 0;
1382 }
1383 
1385  int buf_size)
1386 {
1387  Mpeg1Context *s1 = avctx->priv_data;
1388  MpegEncContext *s = &s1->mpeg_enc_ctx;
1389  int ref, f_code, vbv_delay;
1390 
1391  init_get_bits(&s->gb, buf, buf_size * 8);
1392 
1393  ref = get_bits(&s->gb, 10); /* temporal ref */
1394  s->pict_type = get_bits(&s->gb, 3);
1395  if (s->pict_type == 0 || s->pict_type > 3)
1396  return -1;
1397 
1398  vbv_delay = get_bits(&s->gb, 16);
1399  s->vbv_delay = vbv_delay;
1400  if (s->pict_type == AV_PICTURE_TYPE_P ||
1401  s->pict_type == AV_PICTURE_TYPE_B) {
1402  s->full_pel[0] = get_bits1(&s->gb);
1403  f_code = get_bits(&s->gb, 3);
1404  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1405  return -1;
1406  f_code += !f_code;
1407  s->mpeg_f_code[0][0] = f_code;
1408  s->mpeg_f_code[0][1] = f_code;
1409  }
1410  if (s->pict_type == AV_PICTURE_TYPE_B) {
1411  s->full_pel[1] = get_bits1(&s->gb);
1412  f_code = get_bits(&s->gb, 3);
1413  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1414  return -1;
1415  f_code += !f_code;
1416  s->mpeg_f_code[1][0] = f_code;
1417  s->mpeg_f_code[1][1] = f_code;
1418  }
1421 
1422  if (avctx->debug & FF_DEBUG_PICT_INFO)
1423  av_log(avctx, AV_LOG_DEBUG,
1424  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1425 
1426  s->y_dc_scale = 8;
1427  s->c_dc_scale = 8;
1428  return 0;
1429 }
1430 
1432 {
1433  MpegEncContext *s = &s1->mpeg_enc_ctx;
1434  int horiz_size_ext, vert_size_ext;
1435  int bit_rate_ext;
1436 
1437  skip_bits(&s->gb, 1); /* profile and level esc*/
1438  s->avctx->profile = get_bits(&s->gb, 3);
1439  s->avctx->level = get_bits(&s->gb, 4);
1440  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1441  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1442  horiz_size_ext = get_bits(&s->gb, 2);
1443  vert_size_ext = get_bits(&s->gb, 2);
1444  s->width |= (horiz_size_ext << 12);
1445  s->height |= (vert_size_ext << 12);
1446  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1447  s->bit_rate += (bit_rate_ext << 18) * 400;
1448  skip_bits1(&s->gb); /* marker */
1449  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1450 
1451  s->low_delay = get_bits1(&s->gb);
1452  if (s->flags & CODEC_FLAG_LOW_DELAY)
1453  s->low_delay = 1;
1454 
1455  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1456  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1457 
1458  av_dlog(s->avctx, "sequence extension\n");
1460 
1461  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1463  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1465  s->avctx->rc_buffer_size, s->bit_rate);
1466 }
1467 
1469 {
1470  MpegEncContext *s = &s1->mpeg_enc_ctx;
1471  int color_description, w, h;
1472 
1473  skip_bits(&s->gb, 3); /* video format */
1474  color_description = get_bits1(&s->gb);
1475  if (color_description) {
1476  s->avctx->color_primaries = get_bits(&s->gb, 8);
1477  s->avctx->color_trc = get_bits(&s->gb, 8);
1478  s->avctx->colorspace = get_bits(&s->gb, 8);
1479  }
1480  w = get_bits(&s->gb, 14);
1481  skip_bits(&s->gb, 1); // marker
1482  h = get_bits(&s->gb, 14);
1483  // remaining 3 bits are zero padding
1484 
1485  s1->pan_scan.width = 16 * w;
1486  s1->pan_scan.height = 16 * h;
1487 
1488  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1489  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1490 }
1491 
1493 {
1494  MpegEncContext *s = &s1->mpeg_enc_ctx;
1495  int i, nofco;
1496 
1497  nofco = 1;
1498  if (s->progressive_sequence) {
1499  if (s->repeat_first_field) {
1500  nofco++;
1501  if (s->top_field_first)
1502  nofco++;
1503  }
1504  } else {
1505  if (s->picture_structure == PICT_FRAME) {
1506  nofco++;
1507  if (s->repeat_first_field)
1508  nofco++;
1509  }
1510  }
1511  for (i = 0; i < nofco; i++) {
1512  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1513  skip_bits(&s->gb, 1); // marker
1514  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1515  skip_bits(&s->gb, 1); // marker
1516  }
1517 
1518  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1520  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1521  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1522  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1523  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1524 }
1525 
1526 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1527  uint16_t matrix1[64], int intra)
1528 {
1529  int i;
1530 
1531  for (i = 0; i < 64; i++) {
1532  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1533  int v = get_bits(&s->gb, 8);
1534  if (v == 0) {
1535  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1536  return -1;
1537  }
1538  if (intra && i == 0 && v != 8) {
1539  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1540  v = 8; // needed by pink.mpg / issue1046
1541  }
1542  matrix0[j] = v;
1543  if (matrix1)
1544  matrix1[j] = v;
1545  }
1546  return 0;
1547 }
1548 
1550 {
1551  av_dlog(s->avctx, "matrix extension\n");
1552 
1553  if (get_bits1(&s->gb))
1555  if (get_bits1(&s->gb))
1557  if (get_bits1(&s->gb))
1558  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1559  if (get_bits1(&s->gb))
1560  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1561 }
1562 
1564 {
1565  MpegEncContext *s = &s1->mpeg_enc_ctx;
1566 
1567  s->full_pel[0] = s->full_pel[1] = 0;
1568  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1569  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1570  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1571  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1572  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1574  "Missing picture start code, guessing missing values\n");
1575  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1576  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1578  else
1580  } else
1584  }
1585  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1586  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1587  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1588  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1589 
1590  s->intra_dc_precision = get_bits(&s->gb, 2);
1591  s->picture_structure = get_bits(&s->gb, 2);
1592  s->top_field_first = get_bits1(&s->gb);
1593  s->frame_pred_frame_dct = get_bits1(&s->gb);
1595  s->q_scale_type = get_bits1(&s->gb);
1596  s->intra_vlc_format = get_bits1(&s->gb);
1597  s->alternate_scan = get_bits1(&s->gb);
1598  s->repeat_first_field = get_bits1(&s->gb);
1599  s->chroma_420_type = get_bits1(&s->gb);
1600  s->progressive_frame = get_bits1(&s->gb);
1601 
1602  if (s->alternate_scan) {
1605  } else {
1608  }
1609 
1610  /* composite display not parsed */
1611  av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1612  av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1613  av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1614  av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1615  av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1616  av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1617  av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1618  av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1619  av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1620 }
1621 
1622 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1623 {
1624  AVCodecContext *avctx = s->avctx;
1625  Mpeg1Context *s1 = (Mpeg1Context *) s;
1626 
1627  /* start frame decoding */
1628  if (s->first_field || s->picture_structure == PICT_FRAME) {
1629  AVFrameSideData *pan_scan;
1630 
1631  if (ff_mpv_frame_start(s, avctx) < 0)
1632  return -1;
1633 
1635 
1636  /* first check if we must repeat the frame */
1638  if (s->repeat_first_field) {
1639  if (s->progressive_sequence) {
1640  if (s->top_field_first)
1642  else
1644  } else if (s->progressive_frame) {
1646  }
1647  }
1648 
1651  sizeof(s1->pan_scan));
1652  if (!pan_scan)
1653  return AVERROR(ENOMEM);
1654  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1655 
1656  if (s1->a53_caption) {
1659  s1->a53_caption_size);
1660  if (sd)
1661  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1662  av_freep(&s1->a53_caption);
1663  }
1664 
1665  if (s1->has_stereo3d) {
1667  if (!stereo)
1668  return AVERROR(ENOMEM);
1669 
1670  *stereo = s1->stereo3d;
1671  s1->has_stereo3d = 0;
1672  }
1673 
1674  if (s1->has_afd) {
1675  AVFrameSideData *sd =
1677  AV_FRAME_DATA_AFD, 1);
1678  if (!sd)
1679  return AVERROR(ENOMEM);
1680 
1681  *sd->data = s1->afd;
1682  s1->has_afd = 0;
1683  }
1684 
1685  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1686  ff_thread_finish_setup(avctx);
1687  } else { // second field
1688  int i;
1689 
1690  if (!s->current_picture_ptr) {
1691  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1692  return -1;
1693  }
1694 
1695  if (s->avctx->hwaccel &&
1697  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1698  av_log(avctx, AV_LOG_ERROR,
1699  "hardware accelerator failed to decode first field\n");
1700  }
1701 
1702  for (i = 0; i < 4; i++) {
1703  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1705  s->current_picture.f->data[i] +=
1706  s->current_picture_ptr->f->linesize[i];
1707  }
1708  }
1709 
1710  if (avctx->hwaccel) {
1711  if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1712  return -1;
1713  }
1714 
1715  return 0;
1716 }
1717 
1718 #define DECODE_SLICE_ERROR -1
1719 #define DECODE_SLICE_OK 0
1720 
1721 /**
1722  * Decode a slice.
1723  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1724  * @return DECODE_SLICE_ERROR if the slice is damaged,
1725  * DECODE_SLICE_OK if this slice is OK
1726  */
1727 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1728  const uint8_t **buf, int buf_size)
1729 {
1730  AVCodecContext *avctx = s->avctx;
1731  const int lowres = s->avctx->lowres;
1732  const int field_pic = s->picture_structure != PICT_FRAME;
1733 
1734  s->resync_mb_x =
1735  s->resync_mb_y = -1;
1736 
1737  av_assert0(mb_y < s->mb_height);
1738 
1739  init_get_bits(&s->gb, *buf, buf_size * 8);
1740  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1741  skip_bits(&s->gb, 3);
1742 
1744  s->interlaced_dct = 0;
1745 
1746  s->qscale = get_qscale(s);
1747 
1748  if (s->qscale == 0) {
1749  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1750  return -1;
1751  }
1752 
1753  /* extra slice info */
1754  if (skip_1stop_8data_bits(&s->gb) < 0)
1755  return AVERROR_INVALIDDATA;
1756 
1757  s->mb_x = 0;
1758 
1759  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1760  skip_bits1(&s->gb);
1761  } else {
1762  while (get_bits_left(&s->gb) > 0) {
1763  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1764  MBINCR_VLC_BITS, 2);
1765  if (code < 0) {
1766  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1767  return -1;
1768  }
1769  if (code >= 33) {
1770  if (code == 33)
1771  s->mb_x += 33;
1772  /* otherwise, stuffing, nothing to do */
1773  } else {
1774  s->mb_x += code;
1775  break;
1776  }
1777  }
1778  }
1779 
1780  if (s->mb_x >= (unsigned) s->mb_width) {
1781  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1782  return -1;
1783  }
1784 
1785  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1786  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1787  int start_code = -1;
1788  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1789  if (buf_end < *buf + buf_size)
1790  buf_end -= 4;
1791  s->mb_y = mb_y;
1792  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1793  return DECODE_SLICE_ERROR;
1794  *buf = buf_end;
1795  return DECODE_SLICE_OK;
1796  }
1797 
1798  s->resync_mb_x = s->mb_x;
1799  s->resync_mb_y = s->mb_y = mb_y;
1800  s->mb_skip_run = 0;
1802 
1803  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1804  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1806  "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",
1807  s->qscale,
1808  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1809  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1810  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1811  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1812  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1813  s->progressive_sequence ? "ps" : "",
1814  s->progressive_frame ? "pf" : "",
1815  s->alternate_scan ? "alt" : "",
1816  s->top_field_first ? "top" : "",
1820  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1821  }
1822  }
1823 
1824  for (;;) {
1825  // If 1, we memcpy blocks in xvmcvideo.
1826  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1827  ff_xvmc_init_block(s); // set s->block
1828 
1829  if (mpeg_decode_mb(s, s->block) < 0)
1830  return -1;
1831 
1832  // Note motion_val is normally NULL unless we want to extract the MVs.
1833  if (s->current_picture.motion_val[0] && !s->encoding) {
1834  const int wrap = s->b8_stride;
1835  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1836  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1837  int motion_x, motion_y, dir, i;
1838 
1839  for (i = 0; i < 2; i++) {
1840  for (dir = 0; dir < 2; dir++) {
1841  if (s->mb_intra ||
1842  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1843  motion_x = motion_y = 0;
1844  } else if (s->mv_type == MV_TYPE_16X16 ||
1845  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1846  motion_x = s->mv[dir][0][0];
1847  motion_y = s->mv[dir][0][1];
1848  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1849  motion_x = s->mv[dir][i][0];
1850  motion_y = s->mv[dir][i][1];
1851  }
1852 
1853  s->current_picture.motion_val[dir][xy][0] = motion_x;
1854  s->current_picture.motion_val[dir][xy][1] = motion_y;
1855  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1856  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1857  s->current_picture.ref_index [dir][b8_xy] =
1858  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1859  av_assert2(s->field_select[dir][i] == 0 ||
1860  s->field_select[dir][i] == 1);
1861  }
1862  xy += wrap;
1863  b8_xy += 2;
1864  }
1865  }
1866 
1867  s->dest[0] += 16 >> lowres;
1868  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1869  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1870 
1871  ff_mpv_decode_mb(s, s->block);
1872 
1873  if (++s->mb_x >= s->mb_width) {
1874  const int mb_size = 16 >> s->avctx->lowres;
1875 
1876  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1878 
1879  s->mb_x = 0;
1880  s->mb_y += 1 << field_pic;
1881 
1882  if (s->mb_y >= s->mb_height) {
1883  int left = get_bits_left(&s->gb);
1884  int is_d10 = s->chroma_format == 2 &&
1885  s->pict_type == AV_PICTURE_TYPE_I &&
1886  avctx->profile == 0 && avctx->level == 5 &&
1887  s->intra_dc_precision == 2 &&
1888  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1889  s->progressive_frame == 0
1890  /* vbv_delay == 0xBBB || 0xE10 */;
1891 
1892  if (left >= 32 && !is_d10) {
1893  GetBitContext gb = s->gb;
1894  align_get_bits(&gb);
1895  if (show_bits(&gb, 24) == 0x060E2B) {
1896  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1897  is_d10 = 1;
1898  }
1899  }
1900 
1901  if (left < 0 ||
1902  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1903  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1904  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1905  left, show_bits(&s->gb, FFMIN(left, 23)));
1906  return -1;
1907  } else
1908  goto eos;
1909  }
1910  // There are some files out there which are missing the last slice
1911  // in cases where the slice is completely outside the visible
1912  // area, we detect this here instead of running into the end expecting
1913  // more data
1914  if (s->mb_y >= ((s->height + 15) >> 4) &&
1915  s->progressive_frame &&
1916  !s->progressive_sequence &&
1917  get_bits_left(&s->gb) <= 8 &&
1918  get_bits_left(&s->gb) >= 0 &&
1919  s->mb_skip_run == -1 &&
1920  show_bits(&s->gb, 8) == 0)
1921  goto eos;
1922 
1924  }
1925 
1926  /* skip mb handling */
1927  if (s->mb_skip_run == -1) {
1928  /* read increment again */
1929  s->mb_skip_run = 0;
1930  for (;;) {
1931  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1932  MBINCR_VLC_BITS, 2);
1933  if (code < 0) {
1934  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1935  return -1;
1936  }
1937  if (code >= 33) {
1938  if (code == 33) {
1939  s->mb_skip_run += 33;
1940  } else if (code == 35) {
1941  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1942  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1943  return -1;
1944  }
1945  goto eos; /* end of slice */
1946  }
1947  /* otherwise, stuffing, nothing to do */
1948  } else {
1949  s->mb_skip_run += code;
1950  break;
1951  }
1952  }
1953  if (s->mb_skip_run) {
1954  int i;
1955  if (s->pict_type == AV_PICTURE_TYPE_I) {
1957  "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1958  return -1;
1959  }
1960 
1961  /* skip mb */
1962  s->mb_intra = 0;
1963  for (i = 0; i < 12; i++)
1964  s->block_last_index[i] = -1;
1966  s->mv_type = MV_TYPE_16X16;
1967  else
1968  s->mv_type = MV_TYPE_FIELD;
1969  if (s->pict_type == AV_PICTURE_TYPE_P) {
1970  /* if P type, zero motion vector is implied */
1971  s->mv_dir = MV_DIR_FORWARD;
1972  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1973  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1974  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1975  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1976  } else {
1977  /* if B type, reuse previous vectors and directions */
1978  s->mv[0][0][0] = s->last_mv[0][0][0];
1979  s->mv[0][0][1] = s->last_mv[0][0][1];
1980  s->mv[1][0][0] = s->last_mv[1][0][0];
1981  s->mv[1][0][1] = s->last_mv[1][0][1];
1982  }
1983  }
1984  }
1985  }
1986 eos: // end of slice
1987  if (get_bits_left(&s->gb) < 0) {
1988  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1989  return AVERROR_INVALIDDATA;
1990  }
1991  *buf += (get_bits_count(&s->gb) - 1) / 8;
1992  av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1993  return 0;
1994 }
1995 
1997 {
1998  MpegEncContext *s = *(void **) arg;
1999  const uint8_t *buf = s->gb.buffer;
2000  int mb_y = s->start_mb_y;
2001  const int field_pic = s->picture_structure != PICT_FRAME;
2002 
2003  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2004 
2005  for (;;) {
2006  uint32_t start_code;
2007  int ret;
2008 
2009  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2010  emms_c();
2011  av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2012  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2013  s->start_mb_y, s->end_mb_y, s->er.error_count);
2014  if (ret < 0) {
2015  if (c->err_recognition & AV_EF_EXPLODE)
2016  return ret;
2017  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2019  s->mb_x, s->mb_y,
2021  } else {
2023  s->mb_x - 1, s->mb_y,
2025  }
2026 
2027  if (s->mb_y == s->end_mb_y)
2028  return 0;
2029 
2030  start_code = -1;
2031  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2032  mb_y = start_code - SLICE_MIN_START_CODE;
2033  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2034  mb_y += (*buf&0xE0)<<2;
2035  mb_y <<= field_pic;
2037  mb_y++;
2038  if (mb_y < 0 || mb_y >= s->end_mb_y)
2039  return -1;
2040  }
2041 }
2042 
2043 /**
2044  * Handle slice ends.
2045  * @return 1 if it seems to be the last slice
2046  */
2047 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2048 {
2049  Mpeg1Context *s1 = avctx->priv_data;
2050  MpegEncContext *s = &s1->mpeg_enc_ctx;
2051 
2053  return 0;
2054 
2055  if (s->avctx->hwaccel) {
2056  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2057  av_log(avctx, AV_LOG_ERROR,
2058  "hardware accelerator failed to decode picture\n");
2059  }
2060 
2061  /* end of slice reached */
2062  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2063  /* end of image */
2064 
2065  ff_er_frame_end(&s->er);
2066 
2067  ff_mpv_frame_end(s);
2068 
2069  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2070  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2071  if (ret < 0)
2072  return ret;
2075  } else {
2076  if (avctx->active_thread_type & FF_THREAD_FRAME)
2077  s->picture_number++;
2078  /* latency of 1 frame for I- and P-frames */
2079  /* XXX: use another variable than picture_number */
2080  if (s->last_picture_ptr) {
2081  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2082  if (ret < 0)
2083  return ret;
2086  }
2087  }
2088 
2089  return 1;
2090  } else {
2091  return 0;
2092  }
2093 }
2094 
2096  const uint8_t *buf, int buf_size)
2097 {
2098  Mpeg1Context *s1 = avctx->priv_data;
2099  MpegEncContext *s = &s1->mpeg_enc_ctx;
2100  int width, height;
2101  int i, v, j;
2102 
2103  init_get_bits(&s->gb, buf, buf_size * 8);
2104 
2105  width = get_bits(&s->gb, 12);
2106  height = get_bits(&s->gb, 12);
2107  if (width == 0 || height == 0) {
2108  av_log(avctx, AV_LOG_WARNING,
2109  "Invalid horizontal or vertical size value.\n");
2111  return AVERROR_INVALIDDATA;
2112  }
2113  s->aspect_ratio_info = get_bits(&s->gb, 4);
2114  if (s->aspect_ratio_info == 0) {
2115  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2117  return -1;
2118  }
2119  s->frame_rate_index = get_bits(&s->gb, 4);
2120  if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2121  return -1;
2122  s->bit_rate = get_bits(&s->gb, 18) * 400;
2123  if (get_bits1(&s->gb) == 0) /* marker */
2124  return -1;
2125  s->width = width;
2126  s->height = height;
2127 
2128  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2129  skip_bits(&s->gb, 1);
2130 
2131  /* get matrix */
2132  if (get_bits1(&s->gb)) {
2134  } else {
2135  for (i = 0; i < 64; i++) {
2136  j = s->idsp.idct_permutation[i];
2138  s->intra_matrix[j] = v;
2139  s->chroma_intra_matrix[j] = v;
2140  }
2141  }
2142  if (get_bits1(&s->gb)) {
2144  } else {
2145  for (i = 0; i < 64; i++) {
2146  int j = s->idsp.idct_permutation[i];
2148  s->inter_matrix[j] = v;
2149  s->chroma_inter_matrix[j] = v;
2150  }
2151  }
2152 
2153  if (show_bits(&s->gb, 23) != 0) {
2154  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2155  return -1;
2156  }
2157 
2158  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2159  s->progressive_sequence = 1;
2160  s->progressive_frame = 1;
2162  s->first_field = 0;
2163  s->frame_pred_frame_dct = 1;
2164  s->chroma_format = 1;
2165  s->codec_id =
2167  s->out_format = FMT_MPEG1;
2168  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2169  if (s->flags & CODEC_FLAG_LOW_DELAY)
2170  s->low_delay = 1;
2171 
2172  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2173  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2175 
2176  return 0;
2177 }
2178 
2180 {
2181  Mpeg1Context *s1 = avctx->priv_data;
2182  MpegEncContext *s = &s1->mpeg_enc_ctx;
2183  int i, v;
2184 
2185  /* start new MPEG-1 context decoding */
2186  s->out_format = FMT_MPEG1;
2187  if (s1->mpeg_enc_ctx_allocated) {
2188  ff_mpv_common_end(s);
2189  s1->mpeg_enc_ctx_allocated = 0;
2190  }
2191  s->width = avctx->coded_width;
2192  s->height = avctx->coded_height;
2193  avctx->has_b_frames = 0; // true?
2194  s->low_delay = 1;
2195 
2196  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2197  setup_hwaccel_for_pixfmt(avctx);
2198 
2199  ff_mpv_idct_init(s);
2200  if (ff_mpv_common_init(s) < 0)
2201  return -1;
2202  s1->mpeg_enc_ctx_allocated = 1;
2203 
2204  for (i = 0; i < 64; i++) {
2205  int j = s->idsp.idct_permutation[i];
2207  s->intra_matrix[j] = v;
2208  s->chroma_intra_matrix[j] = v;
2209 
2211  s->inter_matrix[j] = v;
2212  s->chroma_inter_matrix[j] = v;
2213  }
2214 
2215  s->progressive_sequence = 1;
2216  s->progressive_frame = 1;
2218  s->first_field = 0;
2219  s->frame_pred_frame_dct = 1;
2220  s->chroma_format = 1;
2221  if (s->codec_tag == AV_RL32("BW10")) {
2223  } else {
2224  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2226  }
2227  s1->save_width = s->width;
2228  s1->save_height = s->height;
2230  return 0;
2231 }
2232 
2234  const uint8_t *p, int buf_size)
2235 {
2236  Mpeg1Context *s1 = avctx->priv_data;
2237 
2238  if (buf_size >= 6 &&
2239  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2240  p[4] == 3 && (p[5] & 0x40)) {
2241  /* extract A53 Part 4 CC data */
2242  int cc_count = p[5] & 0x1f;
2243  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2244  av_freep(&s1->a53_caption);
2245  s1->a53_caption_size = cc_count * 3;
2247  if (s1->a53_caption)
2248  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2249  }
2250  return 1;
2251  } else if (buf_size >= 11 &&
2252  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2253  /* extract DVD CC data */
2254  int cc_count = 0;
2255  int i;
2256  // There is a caption count field in the data, but it is often
2257  // incorect. So count the number of captions present.
2258  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2259  cc_count++;
2260  // Transform the DVD format into A53 Part 4 format
2261  if (cc_count > 0) {
2262  av_freep(&s1->a53_caption);
2263  s1->a53_caption_size = cc_count * 6;
2265  if (s1->a53_caption) {
2266  uint8_t field1 = !!(p[4] & 0x80);
2267  uint8_t *cap = s1->a53_caption;
2268  p += 5;
2269  for (i = 0; i < cc_count; i++) {
2270  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2271  cap[1] = p[1];
2272  cap[2] = p[2];
2273  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2274  cap[4] = p[4];
2275  cap[5] = p[5];
2276  cap += 6;
2277  p += 6;
2278  }
2279  }
2280  }
2281  return 1;
2282  }
2283  return 0;
2284 }
2285 
2287  const uint8_t *p, int buf_size)
2288 {
2289  Mpeg1Context *s = avctx->priv_data;
2290  const uint8_t *buf_end = p + buf_size;
2291  Mpeg1Context *s1 = avctx->priv_data;
2292 
2293  if (buf_size > 29){
2294  int i;
2295  for(i=0; i<20; i++)
2296  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2297  s->tmpgexs= 1;
2298  }
2299 
2300 /* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2301  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2302  }
2303  av_log(avctx, AV_LOG_ERROR, "\n");*/
2304  }
2305 
2306  /* we parse the DTG active format information */
2307  if (buf_end - p >= 5 &&
2308  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2309  int flags = p[4];
2310  p += 5;
2311  if (flags & 0x80) {
2312  /* skip event id */
2313  p += 2;
2314  }
2315  if (flags & 0x40) {
2316  if (buf_end - p < 1)
2317  return;
2318 #if FF_API_AFD
2320  avctx->dtg_active_format = p[0] & 0x0f;
2322 #endif /* FF_API_AFD */
2323  s1->has_afd = 1;
2324  s1->afd = p[0] & 0x0f;
2325  }
2326  } else if (buf_end - p >= 6 &&
2327  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2328  p[4] == 0x03) { // S3D_video_format_length
2329  // the 0x7F mask ignores the reserved_bit value
2330  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2331 
2332  if (S3D_video_format_type == 0x03 ||
2333  S3D_video_format_type == 0x04 ||
2334  S3D_video_format_type == 0x08 ||
2335  S3D_video_format_type == 0x23) {
2336 
2337  s1->has_stereo3d = 1;
2338 
2339  switch (S3D_video_format_type) {
2340  case 0x03:
2342  break;
2343  case 0x04:
2345  break;
2346  case 0x08:
2348  break;
2349  case 0x23:
2351  break;
2352  }
2353  }
2354  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2355  return;
2356  }
2357 }
2358 
2359 static void mpeg_decode_gop(AVCodecContext *avctx,
2360  const uint8_t *buf, int buf_size)
2361 {
2362  Mpeg1Context *s1 = avctx->priv_data;
2363  MpegEncContext *s = &s1->mpeg_enc_ctx;
2364  int broken_link;
2365  int64_t tc;
2366 
2367  init_get_bits(&s->gb, buf, buf_size * 8);
2368 
2369  tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2370 
2371  s->closed_gop = get_bits1(&s->gb);
2372  /* broken_link indicate that after editing the
2373  * reference frames of the first B-Frames after GOP I-Frame
2374  * are missing (open gop) */
2375  broken_link = get_bits1(&s->gb);
2376 
2377  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2378  char tcbuf[AV_TIMECODE_STR_SIZE];
2381  "GOP (%s) closed_gop=%d broken_link=%d\n",
2382  tcbuf, s->closed_gop, broken_link);
2383  }
2384 }
2385 
2386 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2387  int *got_output, const uint8_t *buf, int buf_size)
2388 {
2389  Mpeg1Context *s = avctx->priv_data;
2391  const uint8_t *buf_ptr = buf;
2392  const uint8_t *buf_end = buf + buf_size;
2393  int ret, input_size;
2394  int last_code = 0, skip_frame = 0;
2395  int picture_start_code_seen = 0;
2396 
2397  for (;;) {
2398  /* find next start code */
2399  uint32_t start_code = -1;
2400  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2401  if (start_code > 0x1ff) {
2402  if (!skip_frame) {
2403  if (HAVE_THREADS &&
2404  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2405  !avctx->hwaccel) {
2406  int i;
2407  av_assert0(avctx->thread_count > 1);
2408 
2409  avctx->execute(avctx, slice_decode_thread,
2410  &s2->thread_context[0], NULL,
2411  s->slice_count, sizeof(void *));
2412  for (i = 0; i < s->slice_count; i++)
2413  s2->er.error_count += s2->thread_context[i]->er.error_count;
2414  }
2415 
2416  if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2417  && uses_vdpau(avctx))
2418  ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2419 
2420  ret = slice_end(avctx, picture);
2421  if (ret < 0)
2422  return ret;
2423  else if (ret) {
2424  // FIXME: merge with the stuff in mpeg_decode_slice
2425  if (s2->last_picture_ptr || s2->low_delay)
2426  *got_output = 1;
2427  }
2428  }
2429  s2->pict_type = 0;
2430 
2431  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2432  return AVERROR_INVALIDDATA;
2433 
2434  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2435  }
2436 
2437  input_size = buf_end - buf_ptr;
2438 
2439  if (avctx->debug & FF_DEBUG_STARTCODE)
2440  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2441  start_code, buf_ptr - buf, input_size);
2442 
2443  /* prepare data for next start code */
2444  switch (start_code) {
2445  case SEQ_START_CODE:
2446  if (last_code == 0) {
2447  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2448  if (buf != avctx->extradata)
2449  s->sync = 1;
2450  } else {
2451  av_log(avctx, AV_LOG_ERROR,
2452  "ignoring SEQ_START_CODE after %X\n", last_code);
2453  if (avctx->err_recognition & AV_EF_EXPLODE)
2454  return AVERROR_INVALIDDATA;
2455  }
2456  break;
2457 
2458  case PICTURE_START_CODE:
2459  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2460  /* If it's a frame picture, there can't be more than one picture header.
2461  Yet, it does happen and we need to handle it. */
2462  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2463  break;
2464  }
2465  picture_start_code_seen = 1;
2466 
2467  if (s2->width <= 0 || s2->height <= 0) {
2468  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2469  s2->width, s2->height);
2470  return AVERROR_INVALIDDATA;
2471  }
2472 
2473  if (s->tmpgexs){
2474  s2->intra_dc_precision= 3;
2475  s2->intra_matrix[0]= 1;
2476  }
2477  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2478  !avctx->hwaccel && s->slice_count) {
2479  int i;
2480 
2481  avctx->execute(avctx, slice_decode_thread,
2482  s2->thread_context, NULL,
2483  s->slice_count, sizeof(void *));
2484  for (i = 0; i < s->slice_count; i++)
2485  s2->er.error_count += s2->thread_context[i]->er.error_count;
2486  s->slice_count = 0;
2487  }
2488  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2489  ret = mpeg_decode_postinit(avctx);
2490  if (ret < 0) {
2491  av_log(avctx, AV_LOG_ERROR,
2492  "mpeg_decode_postinit() failure\n");
2493  return ret;
2494  }
2495 
2496  /* We have a complete image: we try to decompress it. */
2497  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2498  s2->pict_type = 0;
2499  s->first_slice = 1;
2500  last_code = PICTURE_START_CODE;
2501  } else {
2502  av_log(avctx, AV_LOG_ERROR,
2503  "ignoring pic after %X\n", last_code);
2504  if (avctx->err_recognition & AV_EF_EXPLODE)
2505  return AVERROR_INVALIDDATA;
2506  }
2507  break;
2508  case EXT_START_CODE:
2509  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2510 
2511  switch (get_bits(&s2->gb, 4)) {
2512  case 0x1:
2513  if (last_code == 0) {
2515  } else {
2516  av_log(avctx, AV_LOG_ERROR,
2517  "ignoring seq ext after %X\n", last_code);
2518  if (avctx->err_recognition & AV_EF_EXPLODE)
2519  return AVERROR_INVALIDDATA;
2520  }
2521  break;
2522  case 0x2:
2524  break;
2525  case 0x3:
2527  break;
2528  case 0x7:
2530  break;
2531  case 0x8:
2532  if (last_code == PICTURE_START_CODE) {
2534  } else {
2535  av_log(avctx, AV_LOG_ERROR,
2536  "ignoring pic cod ext after %X\n", last_code);
2537  if (avctx->err_recognition & AV_EF_EXPLODE)
2538  return AVERROR_INVALIDDATA;
2539  }
2540  break;
2541  }
2542  break;
2543  case USER_START_CODE:
2544  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2545  break;
2546  case GOP_START_CODE:
2547  if (last_code == 0) {
2548  s2->first_field = 0;
2549  mpeg_decode_gop(avctx, buf_ptr, input_size);
2550  s->sync = 1;
2551  } else {
2552  av_log(avctx, AV_LOG_ERROR,
2553  "ignoring GOP_START_CODE after %X\n", last_code);
2554  if (avctx->err_recognition & AV_EF_EXPLODE)
2555  return AVERROR_INVALIDDATA;
2556  }
2557  break;
2558  default:
2559  if (start_code >= SLICE_MIN_START_CODE &&
2560  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2561  if (s2->progressive_sequence && !s2->progressive_frame) {
2562  s2->progressive_frame = 1;
2563  av_log(s2->avctx, AV_LOG_ERROR,
2564  "interlaced frame in progressive sequence, ignoring\n");
2565  }
2566 
2567  if (s2->picture_structure == 0 ||
2569  av_log(s2->avctx, AV_LOG_ERROR,
2570  "picture_structure %d invalid, ignoring\n",
2571  s2->picture_structure);
2573  }
2574 
2576  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2577 
2578  if (s2->picture_structure == PICT_FRAME) {
2579  s2->first_field = 0;
2580  s2->v_edge_pos = 16 * s2->mb_height;
2581  } else {
2582  s2->first_field ^= 1;
2583  s2->v_edge_pos = 8 * s2->mb_height;
2584  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2585  }
2586  }
2587  if (start_code >= SLICE_MIN_START_CODE &&
2588  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2589  const int field_pic = s2->picture_structure != PICT_FRAME;
2590  int mb_y = start_code - SLICE_MIN_START_CODE;
2591  last_code = SLICE_MIN_START_CODE;
2592  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2593  mb_y += (*buf_ptr&0xE0)<<2;
2594 
2595  mb_y <<= field_pic;
2597  mb_y++;
2598 
2599  if (buf_end - buf_ptr < 2) {
2600  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2601  return AVERROR_INVALIDDATA;
2602  }
2603 
2604  if (mb_y >= s2->mb_height) {
2605  av_log(s2->avctx, AV_LOG_ERROR,
2606  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2607  return -1;
2608  }
2609 
2610  if (!s2->last_picture_ptr) {
2611  /* Skip B-frames if we do not have reference frames and
2612  * GOP is not closed. */
2613  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2614  if (!s2->closed_gop) {
2615  skip_frame = 1;
2616  break;
2617  }
2618  }
2619  }
2621  s->sync = 1;
2622  if (!s2->next_picture_ptr) {
2623  /* Skip P-frames if we do not have a reference frame or
2624  * we have an invalid header. */
2625  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2626  skip_frame = 1;
2627  break;
2628  }
2629  }
2630  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2631  s2->pict_type == AV_PICTURE_TYPE_B) ||
2632  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2633  s2->pict_type != AV_PICTURE_TYPE_I) ||
2634  avctx->skip_frame >= AVDISCARD_ALL) {
2635  skip_frame = 1;
2636  break;
2637  }
2638 
2639  if (!s->mpeg_enc_ctx_allocated)
2640  break;
2641 
2642  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2643  if (mb_y < avctx->skip_top ||
2644  mb_y >= s2->mb_height - avctx->skip_bottom)
2645  break;
2646  }
2647 
2648  if (!s2->pict_type) {
2649  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2650  if (avctx->err_recognition & AV_EF_EXPLODE)
2651  return AVERROR_INVALIDDATA;
2652  break;
2653  }
2654 
2655  if (s->first_slice) {
2656  skip_frame = 0;
2657  s->first_slice = 0;
2658  if (mpeg_field_start(s2, buf, buf_size) < 0)
2659  return -1;
2660  }
2661  if (!s2->current_picture_ptr) {
2662  av_log(avctx, AV_LOG_ERROR,
2663  "current_picture not initialized\n");
2664  return AVERROR_INVALIDDATA;
2665  }
2666 
2667  if (uses_vdpau(avctx)) {
2668  s->slice_count++;
2669  break;
2670  }
2671 
2672  if (HAVE_THREADS &&
2673  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2674  !avctx->hwaccel) {
2675  int threshold = (s2->mb_height * s->slice_count +
2676  s2->slice_context_count / 2) /
2677  s2->slice_context_count;
2678  av_assert0(avctx->thread_count > 1);
2679  if (threshold <= mb_y) {
2680  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2681 
2682  thread_context->start_mb_y = mb_y;
2683  thread_context->end_mb_y = s2->mb_height;
2684  if (s->slice_count) {
2685  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2686  ret = ff_update_duplicate_context(thread_context, s2);
2687  if (ret < 0)
2688  return ret;
2689  }
2690  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2691  s->slice_count++;
2692  }
2693  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2694  } else {
2695  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2696  emms_c();
2697 
2698  if (ret < 0) {
2699  if (avctx->err_recognition & AV_EF_EXPLODE)
2700  return ret;
2701  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2702  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2703  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2705  } else {
2706  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2707  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2709  }
2710  }
2711  }
2712  break;
2713  }
2714  }
2715 }
2716 
2717 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2718  int *got_output, AVPacket *avpkt)
2719 {
2720  const uint8_t *buf = avpkt->data;
2721  int ret;
2722  int buf_size = avpkt->size;
2723  Mpeg1Context *s = avctx->priv_data;
2724  AVFrame *picture = data;
2726 
2727  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2728  /* special case for last picture */
2729  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2730  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2731  if (ret < 0)
2732  return ret;
2733 
2734  s2->next_picture_ptr = NULL;
2735 
2736  *got_output = 1;
2737  }
2738  return buf_size;
2739  }
2740 
2741  if (s2->flags & CODEC_FLAG_TRUNCATED) {
2742  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2743  buf_size, NULL);
2744 
2745  if (ff_combine_frame(&s2->parse_context, next,
2746  (const uint8_t **) &buf, &buf_size) < 0)
2747  return buf_size;
2748  }
2749 
2750  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2751  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2752  || s2->codec_tag == AV_RL32("BW10")
2753  ))
2754  vcr2_init_sequence(avctx);
2755 
2756  s->slice_count = 0;
2757 
2758  if (avctx->extradata && !s->extradata_decoded) {
2759  ret = decode_chunks(avctx, picture, got_output,
2760  avctx->extradata, avctx->extradata_size);
2761  if (*got_output) {
2762  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2763  *got_output = 0;
2764  }
2765  s->extradata_decoded = 1;
2766  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2767  s2->current_picture_ptr = NULL;
2768  return ret;
2769  }
2770  }
2771 
2772  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2773  if (ret<0 || *got_output)
2774  s2->current_picture_ptr = NULL;
2775 
2776  return ret;
2777 }
2778 
2779 static void flush(AVCodecContext *avctx)
2780 {
2781  Mpeg1Context *s = avctx->priv_data;
2782 
2783  s->sync = 0;
2784 
2785  ff_mpeg_flush(avctx);
2786 }
2787 
2789 {
2790  Mpeg1Context *s = avctx->priv_data;
2791 
2792  if (s->mpeg_enc_ctx_allocated)
2794  av_freep(&s->a53_caption);
2795  return 0;
2796 }
2797 
2799  { FF_PROFILE_MPEG2_422, "4:2:2" },
2800  { FF_PROFILE_MPEG2_HIGH, "High" },
2801  { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2802  { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2803  { FF_PROFILE_MPEG2_MAIN, "Main" },
2804  { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2805  { FF_PROFILE_RESERVED, "Reserved" },
2806  { FF_PROFILE_RESERVED, "Reserved" },
2807  { FF_PROFILE_UNKNOWN },
2808 };
2809 
2811  .name = "mpeg1video",
2812  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2813  .type = AVMEDIA_TYPE_VIDEO,
2814  .id = AV_CODEC_ID_MPEG1VIDEO,
2815  .priv_data_size = sizeof(Mpeg1Context),
2819  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2822  .flush = flush,
2823  .max_lowres = 3,
2825 };
2826 
2828  .name = "mpeg2video",
2829  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2830  .type = AVMEDIA_TYPE_VIDEO,
2831  .id = AV_CODEC_ID_MPEG2VIDEO,
2832  .priv_data_size = sizeof(Mpeg1Context),
2836  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2839  .flush = flush,
2840  .max_lowres = 3,
2841  .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2842 };
2843 
2844 //legacy decoder
2846  .name = "mpegvideo",
2847  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2848  .type = AVMEDIA_TYPE_VIDEO,
2849  .id = AV_CODEC_ID_MPEG2VIDEO,
2850  .priv_data_size = sizeof(Mpeg1Context),
2855  .flush = flush,
2856  .max_lowres = 3,
2857 };
2858 
2859 #if FF_API_XVMC
2860 #if CONFIG_MPEG_XVMC_DECODER
2861 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2862 {
2863  if (avctx->active_thread_type & FF_THREAD_SLICE)
2864  return -1;
2865  if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2866  return -1;
2867  if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2868  av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2869  }
2870  mpeg_decode_init(avctx);
2871 
2873  avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2874 
2875  return 0;
2876 }
2877 
2878 AVCodec ff_mpeg_xvmc_decoder = {
2879  .name = "mpegvideo_xvmc",
2880  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2881  .type = AVMEDIA_TYPE_VIDEO,
2882  .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2883  .priv_data_size = sizeof(Mpeg1Context),
2884  .init = mpeg_mc_decode_init,
2887  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2888  CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2889  .flush = flush,
2890 };
2891 
2892 #endif
2893 #endif /* FF_API_XVMC */
2894 
2895 #if CONFIG_MPEG_VDPAU_DECODER
2896 AVCodec ff_mpeg_vdpau_decoder = {
2897  .name = "mpegvideo_vdpau",
2898  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2899  .type = AVMEDIA_TYPE_VIDEO,
2900  .id = AV_CODEC_ID_MPEG2VIDEO,
2901  .priv_data_size = sizeof(Mpeg1Context),
2905  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2907  .flush = flush,
2908 };
2909 #endif
2910 
2911 #if CONFIG_MPEG1_VDPAU_DECODER
2912 AVCodec ff_mpeg1_vdpau_decoder = {
2913  .name = "mpeg1video_vdpau",
2914  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2915  .type = AVMEDIA_TYPE_VIDEO,
2916  .id = AV_CODEC_ID_MPEG1VIDEO,
2917  .priv_data_size = sizeof(Mpeg1Context),
2921  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2923  .flush = flush,
2924 };
2925 #endif