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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 
1124  s->mpeg_enc_ctx.avctx = avctx;
1125  s->mpeg_enc_ctx.flags = avctx->flags;
1126  s->mpeg_enc_ctx.flags2 = avctx->flags2;
1127 
1128  /* we need some permutation to store matrices,
1129  * until the decoder sets the real permutation. */
1130  ff_mpv_idct_init(s2);
1133 
1134  s->mpeg_enc_ctx_allocated = 0;
1136  s->repeat_field = 0;
1137  s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1138  avctx->color_range = AVCOL_RANGE_MPEG;
1139  if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1141  else
1143  return 0;
1144 }
1145 
1147  const AVCodecContext *avctx_from)
1148 {
1149  Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1150  MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1151  int err;
1152 
1153  if (avctx == avctx_from ||
1154  !ctx_from->mpeg_enc_ctx_allocated ||
1155  !s1->context_initialized)
1156  return 0;
1157 
1158  err = ff_mpeg_update_thread_context(avctx, avctx_from);
1159  if (err)
1160  return err;
1161 
1162  if (!ctx->mpeg_enc_ctx_allocated)
1163  memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1164 
1165  if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1166  s->picture_number++;
1167 
1168  return 0;
1169 }
1170 
1171 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1172  const uint8_t *new_perm)
1173 {
1174  uint16_t temp_matrix[64];
1175  int i;
1176 
1177  memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1178 
1179  for (i = 0; i < 64; i++)
1180  matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1181 }
1182 
1184 #if CONFIG_MPEG1_XVMC_HWACCEL
1186 #endif
1187 #if CONFIG_MPEG1_VDPAU_HWACCEL
1190 #endif
1193 };
1194 
1196 #if CONFIG_MPEG2_XVMC_HWACCEL
1198 #endif
1199 #if CONFIG_MPEG2_VDPAU_HWACCEL
1202 #endif
1203 #if CONFIG_MPEG2_DXVA2_HWACCEL
1205 #endif
1206 #if CONFIG_MPEG2_VAAPI_HWACCEL
1208 #endif
1211 };
1212 
1213 static inline int uses_vdpau(AVCodecContext *avctx) {
1214  return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1215 }
1216 
1218 {
1219  Mpeg1Context *s1 = avctx->priv_data;
1220  MpegEncContext *s = &s1->mpeg_enc_ctx;
1221 
1222  if (s->chroma_format < 2)
1223  return ff_thread_get_format(avctx,
1224  avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1227  else if (s->chroma_format == 2)
1228  return AV_PIX_FMT_YUV422P;
1229  else
1230  return AV_PIX_FMT_YUV444P;
1231 }
1232 
1234 {
1235  // until then pix_fmt may be changed right after codec init
1236  if (avctx->hwaccel || uses_vdpau(avctx))
1237  if (avctx->idct_algo == FF_IDCT_AUTO)
1238  avctx->idct_algo = FF_IDCT_SIMPLE;
1239 
1240  if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1241  Mpeg1Context *s1 = avctx->priv_data;
1242  MpegEncContext *s = &s1->mpeg_enc_ctx;
1243 
1244  s->pack_pblocks = 1;
1245 #if FF_API_XVMC
1246  avctx->xvmc_acceleration = 2;
1247 #endif /* FF_API_XVMC */
1248  }
1249 }
1250 
1251 /* Call this function when we know all parameters.
1252  * It may be called in different places for MPEG-1 and MPEG-2. */
1254 {
1255  Mpeg1Context *s1 = avctx->priv_data;
1256  MpegEncContext *s = &s1->mpeg_enc_ctx;
1257  uint8_t old_permutation[64];
1258  int ret;
1259 
1260  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1261  avctx->coded_width != s->width ||
1262  avctx->coded_height != s->height ||
1263  s1->save_width != s->width ||
1264  s1->save_height != s->height ||
1265  s1->save_aspect_info != s->aspect_ratio_info ||
1266  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1267  0) {
1268  if (s1->mpeg_enc_ctx_allocated) {
1269  ParseContext pc = s->parse_context;
1270  s->parse_context.buffer = 0;
1271  ff_mpv_common_end(s);
1272  s->parse_context = pc;
1273  s1->mpeg_enc_ctx_allocated = 0;
1274  }
1275 
1276  if ((s->width == 0) || (s->height == 0))
1277  return -2;
1278 
1279  ret = ff_set_dimensions(avctx, s->width, s->height);
1280  if (ret < 0)
1281  return ret;
1282 
1283  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1284  avctx->rc_max_rate = s->bit_rate;
1285  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1286  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1287  avctx->bit_rate = s->bit_rate;
1288  }
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  ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1352 
1353  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1354  setup_hwaccel_for_pixfmt(avctx);
1355 
1356  /* Quantization matrices may need reordering
1357  * if DCT permutation is changed. */
1358  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1359 
1361  if (ff_mpv_common_init(s) < 0)
1362  return -2;
1363 
1364  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1365  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1366  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1367  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1368 
1369  s1->mpeg_enc_ctx_allocated = 1;
1370  }
1371  return 0;
1372 }
1373 
1375  int buf_size)
1376 {
1377  Mpeg1Context *s1 = avctx->priv_data;
1378  MpegEncContext *s = &s1->mpeg_enc_ctx;
1379  int ref, f_code, vbv_delay;
1380 
1381  init_get_bits(&s->gb, buf, buf_size * 8);
1382 
1383  ref = get_bits(&s->gb, 10); /* temporal ref */
1384  s->pict_type = get_bits(&s->gb, 3);
1385  if (s->pict_type == 0 || s->pict_type > 3)
1386  return -1;
1387 
1388  vbv_delay = get_bits(&s->gb, 16);
1389  s->vbv_delay = vbv_delay;
1390  if (s->pict_type == AV_PICTURE_TYPE_P ||
1391  s->pict_type == AV_PICTURE_TYPE_B) {
1392  s->full_pel[0] = get_bits1(&s->gb);
1393  f_code = get_bits(&s->gb, 3);
1394  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1395  return -1;
1396  f_code += !f_code;
1397  s->mpeg_f_code[0][0] = f_code;
1398  s->mpeg_f_code[0][1] = f_code;
1399  }
1400  if (s->pict_type == AV_PICTURE_TYPE_B) {
1401  s->full_pel[1] = get_bits1(&s->gb);
1402  f_code = get_bits(&s->gb, 3);
1403  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1404  return -1;
1405  f_code += !f_code;
1406  s->mpeg_f_code[1][0] = f_code;
1407  s->mpeg_f_code[1][1] = f_code;
1408  }
1411 
1412  if (avctx->debug & FF_DEBUG_PICT_INFO)
1413  av_log(avctx, AV_LOG_DEBUG,
1414  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1415 
1416  s->y_dc_scale = 8;
1417  s->c_dc_scale = 8;
1418  return 0;
1419 }
1420 
1422 {
1423  MpegEncContext *s = &s1->mpeg_enc_ctx;
1424  int horiz_size_ext, vert_size_ext;
1425  int bit_rate_ext;
1426 
1427  skip_bits(&s->gb, 1); /* profile and level esc*/
1428  s->avctx->profile = get_bits(&s->gb, 3);
1429  s->avctx->level = get_bits(&s->gb, 4);
1430  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1431  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1432  horiz_size_ext = get_bits(&s->gb, 2);
1433  vert_size_ext = get_bits(&s->gb, 2);
1434  s->width |= (horiz_size_ext << 12);
1435  s->height |= (vert_size_ext << 12);
1436  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1437  s->bit_rate += (bit_rate_ext << 18) * 400;
1438  skip_bits1(&s->gb); /* marker */
1439  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1440 
1441  s->low_delay = get_bits1(&s->gb);
1442  if (s->flags & CODEC_FLAG_LOW_DELAY)
1443  s->low_delay = 1;
1444 
1445  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1446  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1447 
1448  av_dlog(s->avctx, "sequence extension\n");
1450 
1451  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1453  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1455  s->avctx->rc_buffer_size, s->bit_rate);
1456 }
1457 
1459 {
1460  MpegEncContext *s = &s1->mpeg_enc_ctx;
1461  int color_description, w, h;
1462 
1463  skip_bits(&s->gb, 3); /* video format */
1464  color_description = get_bits1(&s->gb);
1465  if (color_description) {
1466  s->avctx->color_primaries = get_bits(&s->gb, 8);
1467  s->avctx->color_trc = get_bits(&s->gb, 8);
1468  s->avctx->colorspace = get_bits(&s->gb, 8);
1469  }
1470  w = get_bits(&s->gb, 14);
1471  skip_bits(&s->gb, 1); // marker
1472  h = get_bits(&s->gb, 14);
1473  // remaining 3 bits are zero padding
1474 
1475  s1->pan_scan.width = 16 * w;
1476  s1->pan_scan.height = 16 * h;
1477 
1478  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1479  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1480 }
1481 
1483 {
1484  MpegEncContext *s = &s1->mpeg_enc_ctx;
1485  int i, nofco;
1486 
1487  nofco = 1;
1488  if (s->progressive_sequence) {
1489  if (s->repeat_first_field) {
1490  nofco++;
1491  if (s->top_field_first)
1492  nofco++;
1493  }
1494  } else {
1495  if (s->picture_structure == PICT_FRAME) {
1496  nofco++;
1497  if (s->repeat_first_field)
1498  nofco++;
1499  }
1500  }
1501  for (i = 0; i < nofco; i++) {
1502  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1503  skip_bits(&s->gb, 1); // marker
1504  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1505  skip_bits(&s->gb, 1); // marker
1506  }
1507 
1508  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1510  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1511  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1512  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1513  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1514 }
1515 
1516 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1517  uint16_t matrix1[64], int intra)
1518 {
1519  int i;
1520 
1521  for (i = 0; i < 64; i++) {
1522  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1523  int v = get_bits(&s->gb, 8);
1524  if (v == 0) {
1525  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1526  return -1;
1527  }
1528  if (intra && i == 0 && v != 8) {
1529  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1530  v = 8; // needed by pink.mpg / issue1046
1531  }
1532  matrix0[j] = v;
1533  if (matrix1)
1534  matrix1[j] = v;
1535  }
1536  return 0;
1537 }
1538 
1540 {
1541  av_dlog(s->avctx, "matrix extension\n");
1542 
1543  if (get_bits1(&s->gb))
1545  if (get_bits1(&s->gb))
1547  if (get_bits1(&s->gb))
1548  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1549  if (get_bits1(&s->gb))
1550  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1551 }
1552 
1554 {
1555  MpegEncContext *s = &s1->mpeg_enc_ctx;
1556 
1557  s->full_pel[0] = s->full_pel[1] = 0;
1558  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1559  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1560  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1561  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1562  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1564  "Missing picture start code, guessing missing values\n");
1565  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1566  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1568  else
1570  } else
1574  }
1575  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1576  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1577  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1578  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1579 
1580  s->intra_dc_precision = get_bits(&s->gb, 2);
1581  s->picture_structure = get_bits(&s->gb, 2);
1582  s->top_field_first = get_bits1(&s->gb);
1583  s->frame_pred_frame_dct = get_bits1(&s->gb);
1585  s->q_scale_type = get_bits1(&s->gb);
1586  s->intra_vlc_format = get_bits1(&s->gb);
1587  s->alternate_scan = get_bits1(&s->gb);
1588  s->repeat_first_field = get_bits1(&s->gb);
1589  s->chroma_420_type = get_bits1(&s->gb);
1590  s->progressive_frame = get_bits1(&s->gb);
1591 
1592  if (s->alternate_scan) {
1595  } else {
1598  }
1599 
1600  /* composite display not parsed */
1601  av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1602  av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1603  av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1604  av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1605  av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1606  av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1607  av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1608  av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1609  av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1610 }
1611 
1612 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1613 {
1614  AVCodecContext *avctx = s->avctx;
1615  Mpeg1Context *s1 = (Mpeg1Context *) s;
1616 
1617  /* start frame decoding */
1618  if (s->first_field || s->picture_structure == PICT_FRAME) {
1619  AVFrameSideData *pan_scan;
1620 
1621  if (ff_mpv_frame_start(s, avctx) < 0)
1622  return -1;
1623 
1625 
1626  /* first check if we must repeat the frame */
1628  if (s->repeat_first_field) {
1629  if (s->progressive_sequence) {
1630  if (s->top_field_first)
1632  else
1634  } else if (s->progressive_frame) {
1636  }
1637  }
1638 
1641  sizeof(s1->pan_scan));
1642  if (!pan_scan)
1643  return AVERROR(ENOMEM);
1644  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1645 
1646  if (s1->a53_caption) {
1649  s1->a53_caption_size);
1650  if (sd)
1651  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1652  av_freep(&s1->a53_caption);
1653  }
1654 
1655  if (s1->has_stereo3d) {
1657  if (!stereo)
1658  return AVERROR(ENOMEM);
1659 
1660  *stereo = s1->stereo3d;
1661  s1->has_stereo3d = 0;
1662  }
1663 
1664  if (s1->has_afd) {
1665  AVFrameSideData *sd =
1667  AV_FRAME_DATA_AFD, 1);
1668  if (!sd)
1669  return AVERROR(ENOMEM);
1670 
1671  *sd->data = s1->afd;
1672  s1->has_afd = 0;
1673  }
1674 
1675  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1676  ff_thread_finish_setup(avctx);
1677  } else { // second field
1678  int i;
1679 
1680  if (!s->current_picture_ptr) {
1681  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1682  return -1;
1683  }
1684 
1685  if (s->avctx->hwaccel &&
1687  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1688  av_log(avctx, AV_LOG_ERROR,
1689  "hardware accelerator failed to decode first field\n");
1690  }
1691 
1692  for (i = 0; i < 4; i++) {
1693  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1695  s->current_picture.f->data[i] +=
1696  s->current_picture_ptr->f->linesize[i];
1697  }
1698  }
1699 
1700  if (avctx->hwaccel) {
1701  if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1702  return -1;
1703  }
1704 
1705  return 0;
1706 }
1707 
1708 #define DECODE_SLICE_ERROR -1
1709 #define DECODE_SLICE_OK 0
1710 
1711 /**
1712  * Decode a slice.
1713  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1714  * @return DECODE_SLICE_ERROR if the slice is damaged,
1715  * DECODE_SLICE_OK if this slice is OK
1716  */
1717 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1718  const uint8_t **buf, int buf_size)
1719 {
1720  AVCodecContext *avctx = s->avctx;
1721  const int lowres = s->avctx->lowres;
1722  const int field_pic = s->picture_structure != PICT_FRAME;
1723 
1724  s->resync_mb_x =
1725  s->resync_mb_y = -1;
1726 
1727  av_assert0(mb_y < s->mb_height);
1728 
1729  init_get_bits(&s->gb, *buf, buf_size * 8);
1730  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1731  skip_bits(&s->gb, 3);
1732 
1734  s->interlaced_dct = 0;
1735 
1736  s->qscale = get_qscale(s);
1737 
1738  if (s->qscale == 0) {
1739  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1740  return -1;
1741  }
1742 
1743  /* extra slice info */
1744  if (skip_1stop_8data_bits(&s->gb) < 0)
1745  return AVERROR_INVALIDDATA;
1746 
1747  s->mb_x = 0;
1748 
1749  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1750  skip_bits1(&s->gb);
1751  } else {
1752  while (get_bits_left(&s->gb) > 0) {
1753  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1754  MBINCR_VLC_BITS, 2);
1755  if (code < 0) {
1756  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1757  return -1;
1758  }
1759  if (code >= 33) {
1760  if (code == 33)
1761  s->mb_x += 33;
1762  /* otherwise, stuffing, nothing to do */
1763  } else {
1764  s->mb_x += code;
1765  break;
1766  }
1767  }
1768  }
1769 
1770  if (s->mb_x >= (unsigned) s->mb_width) {
1771  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1772  return -1;
1773  }
1774 
1775  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1776  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1777  int start_code = -1;
1778  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1779  if (buf_end < *buf + buf_size)
1780  buf_end -= 4;
1781  s->mb_y = mb_y;
1782  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1783  return DECODE_SLICE_ERROR;
1784  *buf = buf_end;
1785  return DECODE_SLICE_OK;
1786  }
1787 
1788  s->resync_mb_x = s->mb_x;
1789  s->resync_mb_y = s->mb_y = mb_y;
1790  s->mb_skip_run = 0;
1792 
1793  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1794  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1796  "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",
1797  s->qscale,
1798  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1799  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1800  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1801  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1802  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1803  s->progressive_sequence ? "ps" : "",
1804  s->progressive_frame ? "pf" : "",
1805  s->alternate_scan ? "alt" : "",
1806  s->top_field_first ? "top" : "",
1810  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1811  }
1812  }
1813 
1814  for (;;) {
1815  // If 1, we memcpy blocks in xvmcvideo.
1816  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1817  ff_xvmc_init_block(s); // set s->block
1818 
1819  if (mpeg_decode_mb(s, s->block) < 0)
1820  return -1;
1821 
1822  // Note motion_val is normally NULL unless we want to extract the MVs.
1823  if (s->current_picture.motion_val[0] && !s->encoding) {
1824  const int wrap = s->b8_stride;
1825  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1826  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1827  int motion_x, motion_y, dir, i;
1828 
1829  for (i = 0; i < 2; i++) {
1830  for (dir = 0; dir < 2; dir++) {
1831  if (s->mb_intra ||
1832  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1833  motion_x = motion_y = 0;
1834  } else if (s->mv_type == MV_TYPE_16X16 ||
1835  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1836  motion_x = s->mv[dir][0][0];
1837  motion_y = s->mv[dir][0][1];
1838  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1839  motion_x = s->mv[dir][i][0];
1840  motion_y = s->mv[dir][i][1];
1841  }
1842 
1843  s->current_picture.motion_val[dir][xy][0] = motion_x;
1844  s->current_picture.motion_val[dir][xy][1] = motion_y;
1845  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1846  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1847  s->current_picture.ref_index [dir][b8_xy] =
1848  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1849  av_assert2(s->field_select[dir][i] == 0 ||
1850  s->field_select[dir][i] == 1);
1851  }
1852  xy += wrap;
1853  b8_xy += 2;
1854  }
1855  }
1856 
1857  s->dest[0] += 16 >> lowres;
1858  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1859  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1860 
1861  ff_mpv_decode_mb(s, s->block);
1862 
1863  if (++s->mb_x >= s->mb_width) {
1864  const int mb_size = 16 >> s->avctx->lowres;
1865 
1866  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1868 
1869  s->mb_x = 0;
1870  s->mb_y += 1 << field_pic;
1871 
1872  if (s->mb_y >= s->mb_height) {
1873  int left = get_bits_left(&s->gb);
1874  int is_d10 = s->chroma_format == 2 &&
1875  s->pict_type == AV_PICTURE_TYPE_I &&
1876  avctx->profile == 0 && avctx->level == 5 &&
1877  s->intra_dc_precision == 2 &&
1878  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1879  s->progressive_frame == 0
1880  /* vbv_delay == 0xBBB || 0xE10 */;
1881 
1882  if (left >= 32 && !is_d10) {
1883  GetBitContext gb = s->gb;
1884  align_get_bits(&gb);
1885  if (show_bits(&gb, 24) == 0x060E2B) {
1886  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1887  is_d10 = 1;
1888  }
1889  }
1890 
1891  if (left < 0 ||
1892  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1893  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1894  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1895  left, show_bits(&s->gb, FFMIN(left, 23)));
1896  return -1;
1897  } else
1898  goto eos;
1899  }
1900  // There are some files out there which are missing the last slice
1901  // in cases where the slice is completely outside the visible
1902  // area, we detect this here instead of running into the end expecting
1903  // more data
1904  if (s->mb_y >= ((s->height + 15) >> 4) &&
1905  s->progressive_frame &&
1906  !s->progressive_sequence &&
1907  get_bits_left(&s->gb) <= 8 &&
1908  get_bits_left(&s->gb) >= 0 &&
1909  s->mb_skip_run == -1 &&
1910  show_bits(&s->gb, 8) == 0)
1911  goto eos;
1912 
1914  }
1915 
1916  /* skip mb handling */
1917  if (s->mb_skip_run == -1) {
1918  /* read increment again */
1919  s->mb_skip_run = 0;
1920  for (;;) {
1921  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1922  MBINCR_VLC_BITS, 2);
1923  if (code < 0) {
1924  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1925  return -1;
1926  }
1927  if (code >= 33) {
1928  if (code == 33) {
1929  s->mb_skip_run += 33;
1930  } else if (code == 35) {
1931  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1932  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1933  return -1;
1934  }
1935  goto eos; /* end of slice */
1936  }
1937  /* otherwise, stuffing, nothing to do */
1938  } else {
1939  s->mb_skip_run += code;
1940  break;
1941  }
1942  }
1943  if (s->mb_skip_run) {
1944  int i;
1945  if (s->pict_type == AV_PICTURE_TYPE_I) {
1947  "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1948  return -1;
1949  }
1950 
1951  /* skip mb */
1952  s->mb_intra = 0;
1953  for (i = 0; i < 12; i++)
1954  s->block_last_index[i] = -1;
1956  s->mv_type = MV_TYPE_16X16;
1957  else
1958  s->mv_type = MV_TYPE_FIELD;
1959  if (s->pict_type == AV_PICTURE_TYPE_P) {
1960  /* if P type, zero motion vector is implied */
1961  s->mv_dir = MV_DIR_FORWARD;
1962  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1963  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1964  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1965  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1966  } else {
1967  /* if B type, reuse previous vectors and directions */
1968  s->mv[0][0][0] = s->last_mv[0][0][0];
1969  s->mv[0][0][1] = s->last_mv[0][0][1];
1970  s->mv[1][0][0] = s->last_mv[1][0][0];
1971  s->mv[1][0][1] = s->last_mv[1][0][1];
1972  }
1973  }
1974  }
1975  }
1976 eos: // end of slice
1977  if (get_bits_left(&s->gb) < 0) {
1978  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1979  return AVERROR_INVALIDDATA;
1980  }
1981  *buf += (get_bits_count(&s->gb) - 1) / 8;
1982  av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1983  return 0;
1984 }
1985 
1987 {
1988  MpegEncContext *s = *(void **) arg;
1989  const uint8_t *buf = s->gb.buffer;
1990  int mb_y = s->start_mb_y;
1991  const int field_pic = s->picture_structure != PICT_FRAME;
1992 
1993  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1994 
1995  for (;;) {
1996  uint32_t start_code;
1997  int ret;
1998 
1999  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2000  emms_c();
2001  av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2002  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2003  s->start_mb_y, s->end_mb_y, s->er.error_count);
2004  if (ret < 0) {
2005  if (c->err_recognition & AV_EF_EXPLODE)
2006  return ret;
2007  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2009  s->mb_x, s->mb_y,
2011  } else {
2013  s->mb_x - 1, s->mb_y,
2015  }
2016 
2017  if (s->mb_y == s->end_mb_y)
2018  return 0;
2019 
2020  start_code = -1;
2021  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2022  mb_y = start_code - SLICE_MIN_START_CODE;
2023  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2024  mb_y += (*buf&0xE0)<<2;
2025  mb_y <<= field_pic;
2027  mb_y++;
2028  if (mb_y < 0 || mb_y >= s->end_mb_y)
2029  return -1;
2030  }
2031 }
2032 
2033 /**
2034  * Handle slice ends.
2035  * @return 1 if it seems to be the last slice
2036  */
2037 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2038 {
2039  Mpeg1Context *s1 = avctx->priv_data;
2040  MpegEncContext *s = &s1->mpeg_enc_ctx;
2041 
2043  return 0;
2044 
2045  if (s->avctx->hwaccel) {
2046  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2047  av_log(avctx, AV_LOG_ERROR,
2048  "hardware accelerator failed to decode picture\n");
2049  }
2050 
2051  /* end of slice reached */
2052  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2053  /* end of image */
2054 
2055  ff_er_frame_end(&s->er);
2056 
2057  ff_mpv_frame_end(s);
2058 
2059  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2060  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2061  if (ret < 0)
2062  return ret;
2065  } else {
2066  if (avctx->active_thread_type & FF_THREAD_FRAME)
2067  s->picture_number++;
2068  /* latency of 1 frame for I- and P-frames */
2069  /* XXX: use another variable than picture_number */
2070  if (s->last_picture_ptr) {
2071  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2072  if (ret < 0)
2073  return ret;
2076  }
2077  }
2078 
2079  return 1;
2080  } else {
2081  return 0;
2082  }
2083 }
2084 
2086  const uint8_t *buf, int buf_size)
2087 {
2088  Mpeg1Context *s1 = avctx->priv_data;
2089  MpegEncContext *s = &s1->mpeg_enc_ctx;
2090  int width, height;
2091  int i, v, j;
2092 
2093  init_get_bits(&s->gb, buf, buf_size * 8);
2094 
2095  width = get_bits(&s->gb, 12);
2096  height = get_bits(&s->gb, 12);
2097  if (width == 0 || height == 0) {
2098  av_log(avctx, AV_LOG_WARNING,
2099  "Invalid horizontal or vertical size value.\n");
2101  return AVERROR_INVALIDDATA;
2102  }
2103  s->aspect_ratio_info = get_bits(&s->gb, 4);
2104  if (s->aspect_ratio_info == 0) {
2105  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2107  return -1;
2108  }
2109  s->frame_rate_index = get_bits(&s->gb, 4);
2110  if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2111  return -1;
2112  s->bit_rate = get_bits(&s->gb, 18) * 400;
2113  if (get_bits1(&s->gb) == 0) /* marker */
2114  return -1;
2115  s->width = width;
2116  s->height = height;
2117 
2118  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2119  skip_bits(&s->gb, 1);
2120 
2121  /* get matrix */
2122  if (get_bits1(&s->gb)) {
2124  } else {
2125  for (i = 0; i < 64; i++) {
2126  j = s->idsp.idct_permutation[i];
2128  s->intra_matrix[j] = v;
2129  s->chroma_intra_matrix[j] = v;
2130  }
2131  }
2132  if (get_bits1(&s->gb)) {
2134  } else {
2135  for (i = 0; i < 64; i++) {
2136  int j = s->idsp.idct_permutation[i];
2138  s->inter_matrix[j] = v;
2139  s->chroma_inter_matrix[j] = v;
2140  }
2141  }
2142 
2143  if (show_bits(&s->gb, 23) != 0) {
2144  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2145  return -1;
2146  }
2147 
2148  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2149  s->progressive_sequence = 1;
2150  s->progressive_frame = 1;
2152  s->first_field = 0;
2153  s->frame_pred_frame_dct = 1;
2154  s->chroma_format = 1;
2155  s->codec_id =
2157  s->out_format = FMT_MPEG1;
2158  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2159  if (s->flags & CODEC_FLAG_LOW_DELAY)
2160  s->low_delay = 1;
2161 
2162  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2163  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2164  s->avctx->rc_buffer_size, s->bit_rate);
2165 
2166  return 0;
2167 }
2168 
2170 {
2171  Mpeg1Context *s1 = avctx->priv_data;
2172  MpegEncContext *s = &s1->mpeg_enc_ctx;
2173  int i, v;
2174 
2175  /* start new MPEG-1 context decoding */
2176  s->out_format = FMT_MPEG1;
2177  if (s1->mpeg_enc_ctx_allocated) {
2178  ff_mpv_common_end(s);
2179  s1->mpeg_enc_ctx_allocated = 0;
2180  }
2181  s->width = avctx->coded_width;
2182  s->height = avctx->coded_height;
2183  avctx->has_b_frames = 0; // true?
2184  s->low_delay = 1;
2185 
2186  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2187  setup_hwaccel_for_pixfmt(avctx);
2188 
2189  ff_mpv_idct_init(s);
2190  if (ff_mpv_common_init(s) < 0)
2191  return -1;
2192  s1->mpeg_enc_ctx_allocated = 1;
2193 
2194  for (i = 0; i < 64; i++) {
2195  int j = s->idsp.idct_permutation[i];
2197  s->intra_matrix[j] = v;
2198  s->chroma_intra_matrix[j] = v;
2199 
2201  s->inter_matrix[j] = v;
2202  s->chroma_inter_matrix[j] = v;
2203  }
2204 
2205  s->progressive_sequence = 1;
2206  s->progressive_frame = 1;
2208  s->first_field = 0;
2209  s->frame_pred_frame_dct = 1;
2210  s->chroma_format = 1;
2211  if (s->codec_tag == AV_RL32("BW10")) {
2213  } else {
2214  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2216  }
2217  s1->save_width = s->width;
2218  s1->save_height = s->height;
2220  return 0;
2221 }
2222 
2224  const uint8_t *p, int buf_size)
2225 {
2226  Mpeg1Context *s1 = avctx->priv_data;
2227 
2228  if (buf_size >= 6 &&
2229  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2230  p[4] == 3 && (p[5] & 0x40)) {
2231  /* extract A53 Part 4 CC data */
2232  int cc_count = p[5] & 0x1f;
2233  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2234  av_freep(&s1->a53_caption);
2235  s1->a53_caption_size = cc_count * 3;
2237  if (s1->a53_caption)
2238  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2239  }
2240  return 1;
2241  } else if (buf_size >= 11 &&
2242  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2243  /* extract DVD CC data */
2244  int cc_count = 0;
2245  int i;
2246  // There is a caption count field in the data, but it is often
2247  // incorect. So count the number of captions present.
2248  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2249  cc_count++;
2250  // Transform the DVD format into A53 Part 4 format
2251  if (cc_count > 0) {
2252  av_freep(&s1->a53_caption);
2253  s1->a53_caption_size = cc_count * 6;
2255  if (s1->a53_caption) {
2256  uint8_t field1 = !!(p[4] & 0x80);
2257  uint8_t *cap = s1->a53_caption;
2258  p += 5;
2259  for (i = 0; i < cc_count; i++) {
2260  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2261  cap[1] = p[1];
2262  cap[2] = p[2];
2263  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2264  cap[4] = p[4];
2265  cap[5] = p[5];
2266  cap += 6;
2267  p += 6;
2268  }
2269  }
2270  }
2271  return 1;
2272  }
2273  return 0;
2274 }
2275 
2277  const uint8_t *p, int buf_size)
2278 {
2279  Mpeg1Context *s = avctx->priv_data;
2280  const uint8_t *buf_end = p + buf_size;
2281  Mpeg1Context *s1 = avctx->priv_data;
2282 
2283  if (buf_size > 29){
2284  int i;
2285  for(i=0; i<20; i++)
2286  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2287  s->tmpgexs= 1;
2288  }
2289 
2290 /* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2291  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2292  }
2293  av_log(avctx, AV_LOG_ERROR, "\n");*/
2294  }
2295 
2296  /* we parse the DTG active format information */
2297  if (buf_end - p >= 5 &&
2298  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2299  int flags = p[4];
2300  p += 5;
2301  if (flags & 0x80) {
2302  /* skip event id */
2303  p += 2;
2304  }
2305  if (flags & 0x40) {
2306  if (buf_end - p < 1)
2307  return;
2308 #if FF_API_AFD
2310  avctx->dtg_active_format = p[0] & 0x0f;
2312 #endif /* FF_API_AFD */
2313  s1->has_afd = 1;
2314  s1->afd = p[0] & 0x0f;
2315  }
2316  } else if (buf_end - p >= 6 &&
2317  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2318  p[4] == 0x03) { // S3D_video_format_length
2319  // the 0x7F mask ignores the reserved_bit value
2320  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2321 
2322  if (S3D_video_format_type == 0x03 ||
2323  S3D_video_format_type == 0x04 ||
2324  S3D_video_format_type == 0x08 ||
2325  S3D_video_format_type == 0x23) {
2326 
2327  s1->has_stereo3d = 1;
2328 
2329  switch (S3D_video_format_type) {
2330  case 0x03:
2332  break;
2333  case 0x04:
2335  break;
2336  case 0x08:
2338  break;
2339  case 0x23:
2341  break;
2342  }
2343  }
2344  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2345  return;
2346  }
2347 }
2348 
2349 static void mpeg_decode_gop(AVCodecContext *avctx,
2350  const uint8_t *buf, int buf_size)
2351 {
2352  Mpeg1Context *s1 = avctx->priv_data;
2353  MpegEncContext *s = &s1->mpeg_enc_ctx;
2354  int broken_link;
2355  int64_t tc;
2356 
2357  init_get_bits(&s->gb, buf, buf_size * 8);
2358 
2359  tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2360 
2361  s->closed_gop = get_bits1(&s->gb);
2362  /* broken_link indicate that after editing the
2363  * reference frames of the first B-Frames after GOP I-Frame
2364  * are missing (open gop) */
2365  broken_link = get_bits1(&s->gb);
2366 
2367  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2368  char tcbuf[AV_TIMECODE_STR_SIZE];
2371  "GOP (%s) closed_gop=%d broken_link=%d\n",
2372  tcbuf, s->closed_gop, broken_link);
2373  }
2374 }
2375 
2376 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2377  int *got_output, const uint8_t *buf, int buf_size)
2378 {
2379  Mpeg1Context *s = avctx->priv_data;
2381  const uint8_t *buf_ptr = buf;
2382  const uint8_t *buf_end = buf + buf_size;
2383  int ret, input_size;
2384  int last_code = 0, skip_frame = 0;
2385  int picture_start_code_seen = 0;
2386 
2387  for (;;) {
2388  /* find next start code */
2389  uint32_t start_code = -1;
2390  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2391  if (start_code > 0x1ff) {
2392  if (!skip_frame) {
2393  if (HAVE_THREADS &&
2394  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2395  !avctx->hwaccel) {
2396  int i;
2397  av_assert0(avctx->thread_count > 1);
2398 
2399  avctx->execute(avctx, slice_decode_thread,
2400  &s2->thread_context[0], NULL,
2401  s->slice_count, sizeof(void *));
2402  for (i = 0; i < s->slice_count; i++)
2403  s2->er.error_count += s2->thread_context[i]->er.error_count;
2404  }
2405 
2406  if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2407  && uses_vdpau(avctx))
2408  ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2409 
2410  ret = slice_end(avctx, picture);
2411  if (ret < 0)
2412  return ret;
2413  else if (ret) {
2414  // FIXME: merge with the stuff in mpeg_decode_slice
2415  if (s2->last_picture_ptr || s2->low_delay)
2416  *got_output = 1;
2417  }
2418  }
2419  s2->pict_type = 0;
2420 
2421  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2422  return AVERROR_INVALIDDATA;
2423 
2424  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2425  }
2426 
2427  input_size = buf_end - buf_ptr;
2428 
2429  if (avctx->debug & FF_DEBUG_STARTCODE)
2430  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2431  start_code, buf_ptr - buf, input_size);
2432 
2433  /* prepare data for next start code */
2434  switch (start_code) {
2435  case SEQ_START_CODE:
2436  if (last_code == 0) {
2437  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2438  if (buf != avctx->extradata)
2439  s->sync = 1;
2440  } else {
2441  av_log(avctx, AV_LOG_ERROR,
2442  "ignoring SEQ_START_CODE after %X\n", last_code);
2443  if (avctx->err_recognition & AV_EF_EXPLODE)
2444  return AVERROR_INVALIDDATA;
2445  }
2446  break;
2447 
2448  case PICTURE_START_CODE:
2449  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2450  /* If it's a frame picture, there can't be more than one picture header.
2451  Yet, it does happen and we need to handle it. */
2452  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2453  break;
2454  }
2455  picture_start_code_seen = 1;
2456 
2457  if (s2->width <= 0 || s2->height <= 0) {
2458  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2459  s2->width, s2->height);
2460  return AVERROR_INVALIDDATA;
2461  }
2462 
2463  if (s->tmpgexs){
2464  s2->intra_dc_precision= 3;
2465  s2->intra_matrix[0]= 1;
2466  }
2467  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2468  !avctx->hwaccel && s->slice_count) {
2469  int i;
2470 
2471  avctx->execute(avctx, slice_decode_thread,
2472  s2->thread_context, NULL,
2473  s->slice_count, sizeof(void *));
2474  for (i = 0; i < s->slice_count; i++)
2475  s2->er.error_count += s2->thread_context[i]->er.error_count;
2476  s->slice_count = 0;
2477  }
2478  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2479  ret = mpeg_decode_postinit(avctx);
2480  if (ret < 0) {
2481  av_log(avctx, AV_LOG_ERROR,
2482  "mpeg_decode_postinit() failure\n");
2483  return ret;
2484  }
2485 
2486  /* We have a complete image: we try to decompress it. */
2487  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2488  s2->pict_type = 0;
2489  s->first_slice = 1;
2490  last_code = PICTURE_START_CODE;
2491  } else {
2492  av_log(avctx, AV_LOG_ERROR,
2493  "ignoring pic after %X\n", last_code);
2494  if (avctx->err_recognition & AV_EF_EXPLODE)
2495  return AVERROR_INVALIDDATA;
2496  }
2497  break;
2498  case EXT_START_CODE:
2499  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2500 
2501  switch (get_bits(&s2->gb, 4)) {
2502  case 0x1:
2503  if (last_code == 0) {
2505  } else {
2506  av_log(avctx, AV_LOG_ERROR,
2507  "ignoring seq ext after %X\n", last_code);
2508  if (avctx->err_recognition & AV_EF_EXPLODE)
2509  return AVERROR_INVALIDDATA;
2510  }
2511  break;
2512  case 0x2:
2514  break;
2515  case 0x3:
2517  break;
2518  case 0x7:
2520  break;
2521  case 0x8:
2522  if (last_code == PICTURE_START_CODE) {
2524  } else {
2525  av_log(avctx, AV_LOG_ERROR,
2526  "ignoring pic cod ext after %X\n", last_code);
2527  if (avctx->err_recognition & AV_EF_EXPLODE)
2528  return AVERROR_INVALIDDATA;
2529  }
2530  break;
2531  }
2532  break;
2533  case USER_START_CODE:
2534  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2535  break;
2536  case GOP_START_CODE:
2537  if (last_code == 0) {
2538  s2->first_field = 0;
2539  mpeg_decode_gop(avctx, buf_ptr, input_size);
2540  s->sync = 1;
2541  } else {
2542  av_log(avctx, AV_LOG_ERROR,
2543  "ignoring GOP_START_CODE after %X\n", last_code);
2544  if (avctx->err_recognition & AV_EF_EXPLODE)
2545  return AVERROR_INVALIDDATA;
2546  }
2547  break;
2548  default:
2549  if (start_code >= SLICE_MIN_START_CODE &&
2550  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2551  if (s2->progressive_sequence && !s2->progressive_frame) {
2552  s2->progressive_frame = 1;
2553  av_log(s2->avctx, AV_LOG_ERROR,
2554  "interlaced frame in progressive sequence, ignoring\n");
2555  }
2556 
2557  if (s2->picture_structure == 0 ||
2559  av_log(s2->avctx, AV_LOG_ERROR,
2560  "picture_structure %d invalid, ignoring\n",
2561  s2->picture_structure);
2563  }
2564 
2566  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2567 
2568  if (s2->picture_structure == PICT_FRAME) {
2569  s2->first_field = 0;
2570  s2->v_edge_pos = 16 * s2->mb_height;
2571  } else {
2572  s2->first_field ^= 1;
2573  s2->v_edge_pos = 8 * s2->mb_height;
2574  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2575  }
2576  }
2577  if (start_code >= SLICE_MIN_START_CODE &&
2578  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2579  const int field_pic = s2->picture_structure != PICT_FRAME;
2580  int mb_y = start_code - SLICE_MIN_START_CODE;
2581  last_code = SLICE_MIN_START_CODE;
2582  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2583  mb_y += (*buf_ptr&0xE0)<<2;
2584 
2585  mb_y <<= field_pic;
2587  mb_y++;
2588 
2589  if (buf_end - buf_ptr < 2) {
2590  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2591  return AVERROR_INVALIDDATA;
2592  }
2593 
2594  if (mb_y >= s2->mb_height) {
2595  av_log(s2->avctx, AV_LOG_ERROR,
2596  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2597  return -1;
2598  }
2599 
2600  if (!s2->last_picture_ptr) {
2601  /* Skip B-frames if we do not have reference frames and
2602  * GOP is not closed. */
2603  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2604  if (!s2->closed_gop) {
2605  skip_frame = 1;
2606  break;
2607  }
2608  }
2609  }
2611  s->sync = 1;
2612  if (!s2->next_picture_ptr) {
2613  /* Skip P-frames if we do not have a reference frame or
2614  * we have an invalid header. */
2615  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2616  skip_frame = 1;
2617  break;
2618  }
2619  }
2620  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2621  s2->pict_type == AV_PICTURE_TYPE_B) ||
2622  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2623  s2->pict_type != AV_PICTURE_TYPE_I) ||
2624  avctx->skip_frame >= AVDISCARD_ALL) {
2625  skip_frame = 1;
2626  break;
2627  }
2628 
2629  if (!s->mpeg_enc_ctx_allocated)
2630  break;
2631 
2632  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2633  if (mb_y < avctx->skip_top ||
2634  mb_y >= s2->mb_height - avctx->skip_bottom)
2635  break;
2636  }
2637 
2638  if (!s2->pict_type) {
2639  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2640  if (avctx->err_recognition & AV_EF_EXPLODE)
2641  return AVERROR_INVALIDDATA;
2642  break;
2643  }
2644 
2645  if (s->first_slice) {
2646  skip_frame = 0;
2647  s->first_slice = 0;
2648  if (mpeg_field_start(s2, buf, buf_size) < 0)
2649  return -1;
2650  }
2651  if (!s2->current_picture_ptr) {
2652  av_log(avctx, AV_LOG_ERROR,
2653  "current_picture not initialized\n");
2654  return AVERROR_INVALIDDATA;
2655  }
2656 
2657  if (uses_vdpau(avctx)) {
2658  s->slice_count++;
2659  break;
2660  }
2661 
2662  if (HAVE_THREADS &&
2663  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2664  !avctx->hwaccel) {
2665  int threshold = (s2->mb_height * s->slice_count +
2666  s2->slice_context_count / 2) /
2667  s2->slice_context_count;
2668  av_assert0(avctx->thread_count > 1);
2669  if (threshold <= mb_y) {
2670  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2671 
2672  thread_context->start_mb_y = mb_y;
2673  thread_context->end_mb_y = s2->mb_height;
2674  if (s->slice_count) {
2675  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2676  ret = ff_update_duplicate_context(thread_context, s2);
2677  if (ret < 0)
2678  return ret;
2679  }
2680  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2681  s->slice_count++;
2682  }
2683  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2684  } else {
2685  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2686  emms_c();
2687 
2688  if (ret < 0) {
2689  if (avctx->err_recognition & AV_EF_EXPLODE)
2690  return ret;
2691  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2692  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2693  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2695  } else {
2696  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2697  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2699  }
2700  }
2701  }
2702  break;
2703  }
2704  }
2705 }
2706 
2707 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2708  int *got_output, AVPacket *avpkt)
2709 {
2710  const uint8_t *buf = avpkt->data;
2711  int ret;
2712  int buf_size = avpkt->size;
2713  Mpeg1Context *s = avctx->priv_data;
2714  AVFrame *picture = data;
2716 
2717  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2718  /* special case for last picture */
2719  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2720  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2721  if (ret < 0)
2722  return ret;
2723 
2724  s2->next_picture_ptr = NULL;
2725 
2726  *got_output = 1;
2727  }
2728  return buf_size;
2729  }
2730 
2731  if (s2->flags & CODEC_FLAG_TRUNCATED) {
2732  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2733  buf_size, NULL);
2734 
2735  if (ff_combine_frame(&s2->parse_context, next,
2736  (const uint8_t **) &buf, &buf_size) < 0)
2737  return buf_size;
2738  }
2739 
2740  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2741  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2742  || s2->codec_tag == AV_RL32("BW10")
2743  ))
2744  vcr2_init_sequence(avctx);
2745 
2746  s->slice_count = 0;
2747 
2748  if (avctx->extradata && !s->extradata_decoded) {
2749  ret = decode_chunks(avctx, picture, got_output,
2750  avctx->extradata, avctx->extradata_size);
2751  if (*got_output) {
2752  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2753  *got_output = 0;
2754  }
2755  s->extradata_decoded = 1;
2756  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2757  s2->current_picture_ptr = NULL;
2758  return ret;
2759  }
2760  }
2761 
2762  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2763  if (ret<0 || *got_output)
2764  s2->current_picture_ptr = NULL;
2765 
2766  return ret;
2767 }
2768 
2769 static void flush(AVCodecContext *avctx)
2770 {
2771  Mpeg1Context *s = avctx->priv_data;
2772 
2773  s->sync = 0;
2774 
2775  ff_mpeg_flush(avctx);
2776 }
2777 
2779 {
2780  Mpeg1Context *s = avctx->priv_data;
2781 
2782  if (s->mpeg_enc_ctx_allocated)
2784  av_freep(&s->a53_caption);
2785  return 0;
2786 }
2787 
2789  { FF_PROFILE_MPEG2_422, "4:2:2" },
2790  { FF_PROFILE_MPEG2_HIGH, "High" },
2791  { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2792  { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2793  { FF_PROFILE_MPEG2_MAIN, "Main" },
2794  { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2795  { FF_PROFILE_RESERVED, "Reserved" },
2796  { FF_PROFILE_RESERVED, "Reserved" },
2797  { FF_PROFILE_UNKNOWN },
2798 };
2799 
2801  .name = "mpeg1video",
2802  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2803  .type = AVMEDIA_TYPE_VIDEO,
2804  .id = AV_CODEC_ID_MPEG1VIDEO,
2805  .priv_data_size = sizeof(Mpeg1Context),
2809  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2812  .flush = flush,
2813  .max_lowres = 3,
2815 };
2816 
2818  .name = "mpeg2video",
2819  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2820  .type = AVMEDIA_TYPE_VIDEO,
2821  .id = AV_CODEC_ID_MPEG2VIDEO,
2822  .priv_data_size = sizeof(Mpeg1Context),
2826  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2829  .flush = flush,
2830  .max_lowres = 3,
2831  .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2832 };
2833 
2834 //legacy decoder
2836  .name = "mpegvideo",
2837  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2838  .type = AVMEDIA_TYPE_VIDEO,
2839  .id = AV_CODEC_ID_MPEG2VIDEO,
2840  .priv_data_size = sizeof(Mpeg1Context),
2845  .flush = flush,
2846  .max_lowres = 3,
2847 };
2848 
2849 #if FF_API_XVMC
2850 #if CONFIG_MPEG_XVMC_DECODER
2851 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2852 {
2853  if (avctx->active_thread_type & FF_THREAD_SLICE)
2854  return -1;
2855  if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2856  return -1;
2857  if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2858  av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2859  }
2860  mpeg_decode_init(avctx);
2861 
2863  avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2864 
2865  return 0;
2866 }
2867 
2868 AVCodec ff_mpeg_xvmc_decoder = {
2869  .name = "mpegvideo_xvmc",
2870  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2871  .type = AVMEDIA_TYPE_VIDEO,
2872  .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2873  .priv_data_size = sizeof(Mpeg1Context),
2874  .init = mpeg_mc_decode_init,
2877  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2878  CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2879  .flush = flush,
2880 };
2881 
2882 #endif
2883 #endif /* FF_API_XVMC */
2884 
2885 #if CONFIG_MPEG_VDPAU_DECODER
2886 AVCodec ff_mpeg_vdpau_decoder = {
2887  .name = "mpegvideo_vdpau",
2888  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2889  .type = AVMEDIA_TYPE_VIDEO,
2890  .id = AV_CODEC_ID_MPEG2VIDEO,
2891  .priv_data_size = sizeof(Mpeg1Context),
2895  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2897  .flush = flush,
2898 };
2899 #endif
2900 
2901 #if CONFIG_MPEG1_VDPAU_DECODER
2902 AVCodec ff_mpeg1_vdpau_decoder = {
2903  .name = "mpeg1video_vdpau",
2904  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2905  .type = AVMEDIA_TYPE_VIDEO,
2906  .id = AV_CODEC_ID_MPEG1VIDEO,
2907  .priv_data_size = sizeof(Mpeg1Context),
2911  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2913  .flush = flush,
2914 };
2915 #endif