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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 inline int uses_vdpau(AVCodecContext *avctx) {
1213  return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1214 }
1215 
1217 {
1218  Mpeg1Context *s1 = avctx->priv_data;
1219  MpegEncContext *s = &s1->mpeg_enc_ctx;
1220 
1221  if (s->chroma_format < 2)
1222  return ff_thread_get_format(avctx,
1223  avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1226  else if (s->chroma_format == 2)
1227  return AV_PIX_FMT_YUV422P;
1228  else
1229  return AV_PIX_FMT_YUV444P;
1230 }
1231 
1233 {
1234  // until then pix_fmt may be changed right after codec init
1235  if (avctx->hwaccel || uses_vdpau(avctx))
1236  if (avctx->idct_algo == FF_IDCT_AUTO)
1237  avctx->idct_algo = FF_IDCT_SIMPLE;
1238 
1239  if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1240  Mpeg1Context *s1 = avctx->priv_data;
1241  MpegEncContext *s = &s1->mpeg_enc_ctx;
1242 
1243  s->pack_pblocks = 1;
1244 #if FF_API_XVMC
1245  avctx->xvmc_acceleration = 2;
1246 #endif /* FF_API_XVMC */
1247  }
1248 }
1249 
1250 /* Call this function when we know all parameters.
1251  * It may be called in different places for MPEG-1 and MPEG-2. */
1253 {
1254  Mpeg1Context *s1 = avctx->priv_data;
1255  MpegEncContext *s = &s1->mpeg_enc_ctx;
1256  uint8_t old_permutation[64];
1257  int ret;
1258 
1259  if ((s1->mpeg_enc_ctx_allocated == 0) ||
1260  avctx->coded_width != s->width ||
1261  avctx->coded_height != s->height ||
1262  s1->save_width != s->width ||
1263  s1->save_height != s->height ||
1264  s1->save_aspect_info != s->aspect_ratio_info ||
1265  (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1266  0) {
1267  if (s1->mpeg_enc_ctx_allocated) {
1268  ParseContext pc = s->parse_context;
1269  s->parse_context.buffer = 0;
1270  ff_mpv_common_end(s);
1271  s->parse_context = pc;
1272  s1->mpeg_enc_ctx_allocated = 0;
1273  }
1274 
1275  if ((s->width == 0) || (s->height == 0))
1276  return -2;
1277 
1278  ret = ff_set_dimensions(avctx, s->width, s->height);
1279  if (ret < 0)
1280  return ret;
1281 
1282  if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1283  avctx->rc_max_rate = s->bit_rate;
1284  } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1285  (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1286  avctx->bit_rate = s->bit_rate;
1287  }
1289  s1->save_width = s->width;
1290  s1->save_height = s->height;
1292 
1293  /* low_delay may be forced, in this case we will have B-frames
1294  * that behave like P-frames. */
1295  avctx->has_b_frames = !s->low_delay;
1296 
1297  if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1298  // MPEG-1 fps
1301  // MPEG-1 aspect
1303  avctx->ticks_per_frame = 1;
1304  } else { // MPEG-2
1305  // MPEG-2 fps
1307  &s->avctx->time_base.num,
1310  1 << 30);
1311  avctx->ticks_per_frame = 2;
1312  // MPEG-2 aspect
1313  if (s->aspect_ratio_info > 1) {
1314  AVRational dar =
1316  (AVRational) { s1->pan_scan.width,
1317  s1->pan_scan.height }),
1318  (AVRational) { s->width, s->height });
1319 
1320  /* We ignore the spec here and guess a bit as reality does not
1321  * match the spec, see for example res_change_ffmpeg_aspect.ts
1322  * and sequence-display-aspect.mpg.
1323  * issue1613, 621, 562 */
1324  if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1325  (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1326  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1329  (AVRational) { s->width, s->height });
1330  } else {
1333  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1334 // issue1613 4/3 16/9 -> 16/9
1335 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1336 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1337 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1338  av_dlog(avctx, "A %d/%d\n",
1341  av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1343  }
1344  } else {
1345  s->avctx->sample_aspect_ratio =
1346  ff_mpeg2_aspect[s->aspect_ratio_info];
1347  }
1348  } // MPEG-2
1349 
1350  ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1351 
1352  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1353  setup_hwaccel_for_pixfmt(avctx);
1354 
1355  /* Quantization matrices may need reordering
1356  * if DCT permutation is changed. */
1357  memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1358 
1360  if (ff_mpv_common_init(s) < 0)
1361  return -2;
1362 
1363  quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1364  quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1365  quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1366  quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1367 
1368  s1->mpeg_enc_ctx_allocated = 1;
1369  }
1370  return 0;
1371 }
1372 
1374  int buf_size)
1375 {
1376  Mpeg1Context *s1 = avctx->priv_data;
1377  MpegEncContext *s = &s1->mpeg_enc_ctx;
1378  int ref, f_code, vbv_delay;
1379 
1380  init_get_bits(&s->gb, buf, buf_size * 8);
1381 
1382  ref = get_bits(&s->gb, 10); /* temporal ref */
1383  s->pict_type = get_bits(&s->gb, 3);
1384  if (s->pict_type == 0 || s->pict_type > 3)
1385  return -1;
1386 
1387  vbv_delay = get_bits(&s->gb, 16);
1388  s->vbv_delay = vbv_delay;
1389  if (s->pict_type == AV_PICTURE_TYPE_P ||
1390  s->pict_type == AV_PICTURE_TYPE_B) {
1391  s->full_pel[0] = get_bits1(&s->gb);
1392  f_code = get_bits(&s->gb, 3);
1393  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1394  return -1;
1395  f_code += !f_code;
1396  s->mpeg_f_code[0][0] = f_code;
1397  s->mpeg_f_code[0][1] = f_code;
1398  }
1399  if (s->pict_type == AV_PICTURE_TYPE_B) {
1400  s->full_pel[1] = get_bits1(&s->gb);
1401  f_code = get_bits(&s->gb, 3);
1402  if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1403  return -1;
1404  f_code += !f_code;
1405  s->mpeg_f_code[1][0] = f_code;
1406  s->mpeg_f_code[1][1] = f_code;
1407  }
1410 
1411  if (avctx->debug & FF_DEBUG_PICT_INFO)
1412  av_log(avctx, AV_LOG_DEBUG,
1413  "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1414 
1415  s->y_dc_scale = 8;
1416  s->c_dc_scale = 8;
1417  return 0;
1418 }
1419 
1421 {
1422  MpegEncContext *s = &s1->mpeg_enc_ctx;
1423  int horiz_size_ext, vert_size_ext;
1424  int bit_rate_ext;
1425 
1426  skip_bits(&s->gb, 1); /* profile and level esc*/
1427  s->avctx->profile = get_bits(&s->gb, 3);
1428  s->avctx->level = get_bits(&s->gb, 4);
1429  s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1430  s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1431  horiz_size_ext = get_bits(&s->gb, 2);
1432  vert_size_ext = get_bits(&s->gb, 2);
1433  s->width |= (horiz_size_ext << 12);
1434  s->height |= (vert_size_ext << 12);
1435  bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1436  s->bit_rate += (bit_rate_ext << 18) * 400;
1437  skip_bits1(&s->gb); /* marker */
1438  s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1439 
1440  s->low_delay = get_bits1(&s->gb);
1441  if (s->flags & CODEC_FLAG_LOW_DELAY)
1442  s->low_delay = 1;
1443 
1444  s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1445  s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1446 
1447  av_dlog(s->avctx, "sequence extension\n");
1449 
1450  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1452  "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1454  s->avctx->rc_buffer_size, s->bit_rate);
1455 }
1456 
1458 {
1459  MpegEncContext *s = &s1->mpeg_enc_ctx;
1460  int color_description, w, h;
1461 
1462  skip_bits(&s->gb, 3); /* video format */
1463  color_description = get_bits1(&s->gb);
1464  if (color_description) {
1465  s->avctx->color_primaries = get_bits(&s->gb, 8);
1466  s->avctx->color_trc = get_bits(&s->gb, 8);
1467  s->avctx->colorspace = get_bits(&s->gb, 8);
1468  }
1469  w = get_bits(&s->gb, 14);
1470  skip_bits(&s->gb, 1); // marker
1471  h = get_bits(&s->gb, 14);
1472  // remaining 3 bits are zero padding
1473 
1474  s1->pan_scan.width = 16 * w;
1475  s1->pan_scan.height = 16 * h;
1476 
1477  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1478  av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1479 }
1480 
1482 {
1483  MpegEncContext *s = &s1->mpeg_enc_ctx;
1484  int i, nofco;
1485 
1486  nofco = 1;
1487  if (s->progressive_sequence) {
1488  if (s->repeat_first_field) {
1489  nofco++;
1490  if (s->top_field_first)
1491  nofco++;
1492  }
1493  } else {
1494  if (s->picture_structure == PICT_FRAME) {
1495  nofco++;
1496  if (s->repeat_first_field)
1497  nofco++;
1498  }
1499  }
1500  for (i = 0; i < nofco; i++) {
1501  s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1502  skip_bits(&s->gb, 1); // marker
1503  s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1504  skip_bits(&s->gb, 1); // marker
1505  }
1506 
1507  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1509  "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1510  s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1511  s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1512  s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1513 }
1514 
1515 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1516  uint16_t matrix1[64], int intra)
1517 {
1518  int i;
1519 
1520  for (i = 0; i < 64; i++) {
1521  int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1522  int v = get_bits(&s->gb, 8);
1523  if (v == 0) {
1524  av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1525  return -1;
1526  }
1527  if (intra && i == 0 && v != 8) {
1528  av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1529  v = 8; // needed by pink.mpg / issue1046
1530  }
1531  matrix0[j] = v;
1532  if (matrix1)
1533  matrix1[j] = v;
1534  }
1535  return 0;
1536 }
1537 
1539 {
1540  av_dlog(s->avctx, "matrix extension\n");
1541 
1542  if (get_bits1(&s->gb))
1544  if (get_bits1(&s->gb))
1546  if (get_bits1(&s->gb))
1547  load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1548  if (get_bits1(&s->gb))
1549  load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1550 }
1551 
1553 {
1554  MpegEncContext *s = &s1->mpeg_enc_ctx;
1555 
1556  s->full_pel[0] = s->full_pel[1] = 0;
1557  s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1558  s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1559  s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1560  s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1561  if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1563  "Missing picture start code, guessing missing values\n");
1564  if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1565  if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1567  else
1569  } else
1573  }
1574  s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1575  s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1576  s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1577  s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1578 
1579  s->intra_dc_precision = get_bits(&s->gb, 2);
1580  s->picture_structure = get_bits(&s->gb, 2);
1581  s->top_field_first = get_bits1(&s->gb);
1582  s->frame_pred_frame_dct = get_bits1(&s->gb);
1584  s->q_scale_type = get_bits1(&s->gb);
1585  s->intra_vlc_format = get_bits1(&s->gb);
1586  s->alternate_scan = get_bits1(&s->gb);
1587  s->repeat_first_field = get_bits1(&s->gb);
1588  s->chroma_420_type = get_bits1(&s->gb);
1589  s->progressive_frame = get_bits1(&s->gb);
1590 
1591  if (s->alternate_scan) {
1594  } else {
1597  }
1598 
1599  /* composite display not parsed */
1600  av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1601  av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1602  av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1603  av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1604  av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1605  av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1606  av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1607  av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1608  av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1609 }
1610 
1611 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1612 {
1613  AVCodecContext *avctx = s->avctx;
1614  Mpeg1Context *s1 = (Mpeg1Context *) s;
1615 
1616  /* start frame decoding */
1617  if (s->first_field || s->picture_structure == PICT_FRAME) {
1618  AVFrameSideData *pan_scan;
1619 
1620  if (ff_mpv_frame_start(s, avctx) < 0)
1621  return -1;
1622 
1624 
1625  /* first check if we must repeat the frame */
1627  if (s->repeat_first_field) {
1628  if (s->progressive_sequence) {
1629  if (s->top_field_first)
1631  else
1633  } else if (s->progressive_frame) {
1635  }
1636  }
1637 
1640  sizeof(s1->pan_scan));
1641  if (!pan_scan)
1642  return AVERROR(ENOMEM);
1643  memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1644 
1645  if (s1->a53_caption) {
1648  s1->a53_caption_size);
1649  if (sd)
1650  memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1651  av_freep(&s1->a53_caption);
1652  }
1653 
1654  if (s1->has_stereo3d) {
1656  if (!stereo)
1657  return AVERROR(ENOMEM);
1658 
1659  *stereo = s1->stereo3d;
1660  s1->has_stereo3d = 0;
1661  }
1662 
1663  if (s1->has_afd) {
1664  AVFrameSideData *sd =
1666  AV_FRAME_DATA_AFD, 1);
1667  if (!sd)
1668  return AVERROR(ENOMEM);
1669 
1670  *sd->data = s1->afd;
1671  s1->has_afd = 0;
1672  }
1673 
1674  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1675  ff_thread_finish_setup(avctx);
1676  } else { // second field
1677  int i;
1678 
1679  if (!s->current_picture_ptr) {
1680  av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1681  return -1;
1682  }
1683 
1684  if (s->avctx->hwaccel &&
1686  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1687  av_log(avctx, AV_LOG_ERROR,
1688  "hardware accelerator failed to decode first field\n");
1689  }
1690 
1691  for (i = 0; i < 4; i++) {
1692  s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1694  s->current_picture.f->data[i] +=
1695  s->current_picture_ptr->f->linesize[i];
1696  }
1697  }
1698 
1699  if (avctx->hwaccel) {
1700  if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1701  return -1;
1702  }
1703 
1704  return 0;
1705 }
1706 
1707 #define DECODE_SLICE_ERROR -1
1708 #define DECODE_SLICE_OK 0
1709 
1710 /**
1711  * Decode a slice.
1712  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1713  * @return DECODE_SLICE_ERROR if the slice is damaged,
1714  * DECODE_SLICE_OK if this slice is OK
1715  */
1716 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1717  const uint8_t **buf, int buf_size)
1718 {
1719  AVCodecContext *avctx = s->avctx;
1720  const int lowres = s->avctx->lowres;
1721  const int field_pic = s->picture_structure != PICT_FRAME;
1722 
1723  s->resync_mb_x =
1724  s->resync_mb_y = -1;
1725 
1726  av_assert0(mb_y < s->mb_height);
1727 
1728  init_get_bits(&s->gb, *buf, buf_size * 8);
1729  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1730  skip_bits(&s->gb, 3);
1731 
1733  s->interlaced_dct = 0;
1734 
1735  s->qscale = get_qscale(s);
1736 
1737  if (s->qscale == 0) {
1738  av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1739  return -1;
1740  }
1741 
1742  /* extra slice info */
1743  if (skip_1stop_8data_bits(&s->gb) < 0)
1744  return AVERROR_INVALIDDATA;
1745 
1746  s->mb_x = 0;
1747 
1748  if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1749  skip_bits1(&s->gb);
1750  } else {
1751  while (get_bits_left(&s->gb) > 0) {
1752  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1753  MBINCR_VLC_BITS, 2);
1754  if (code < 0) {
1755  av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1756  return -1;
1757  }
1758  if (code >= 33) {
1759  if (code == 33)
1760  s->mb_x += 33;
1761  /* otherwise, stuffing, nothing to do */
1762  } else {
1763  s->mb_x += code;
1764  break;
1765  }
1766  }
1767  }
1768 
1769  if (s->mb_x >= (unsigned) s->mb_width) {
1770  av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1771  return -1;
1772  }
1773 
1774  if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1775  const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1776  int start_code = -1;
1777  buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1778  if (buf_end < *buf + buf_size)
1779  buf_end -= 4;
1780  s->mb_y = mb_y;
1781  if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1782  return DECODE_SLICE_ERROR;
1783  *buf = buf_end;
1784  return DECODE_SLICE_OK;
1785  }
1786 
1787  s->resync_mb_x = s->mb_x;
1788  s->resync_mb_y = s->mb_y = mb_y;
1789  s->mb_skip_run = 0;
1791 
1792  if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1793  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1795  "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",
1796  s->qscale,
1797  s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1798  s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1799  s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1800  (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1801  (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1802  s->progressive_sequence ? "ps" : "",
1803  s->progressive_frame ? "pf" : "",
1804  s->alternate_scan ? "alt" : "",
1805  s->top_field_first ? "top" : "",
1809  s->repeat_first_field, s->chroma_420_type ? "420" : "");
1810  }
1811  }
1812 
1813  for (;;) {
1814  // If 1, we memcpy blocks in xvmcvideo.
1815  if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1816  ff_xvmc_init_block(s); // set s->block
1817 
1818  if (mpeg_decode_mb(s, s->block) < 0)
1819  return -1;
1820 
1821  // Note motion_val is normally NULL unless we want to extract the MVs.
1822  if (s->current_picture.motion_val[0] && !s->encoding) {
1823  const int wrap = s->b8_stride;
1824  int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1825  int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1826  int motion_x, motion_y, dir, i;
1827 
1828  for (i = 0; i < 2; i++) {
1829  for (dir = 0; dir < 2; dir++) {
1830  if (s->mb_intra ||
1831  (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1832  motion_x = motion_y = 0;
1833  } else if (s->mv_type == MV_TYPE_16X16 ||
1834  (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1835  motion_x = s->mv[dir][0][0];
1836  motion_y = s->mv[dir][0][1];
1837  } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1838  motion_x = s->mv[dir][i][0];
1839  motion_y = s->mv[dir][i][1];
1840  }
1841 
1842  s->current_picture.motion_val[dir][xy][0] = motion_x;
1843  s->current_picture.motion_val[dir][xy][1] = motion_y;
1844  s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1845  s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1846  s->current_picture.ref_index [dir][b8_xy] =
1847  s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1848  av_assert2(s->field_select[dir][i] == 0 ||
1849  s->field_select[dir][i] == 1);
1850  }
1851  xy += wrap;
1852  b8_xy += 2;
1853  }
1854  }
1855 
1856  s->dest[0] += 16 >> lowres;
1857  s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1858  s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1859 
1860  ff_mpv_decode_mb(s, s->block);
1861 
1862  if (++s->mb_x >= s->mb_width) {
1863  const int mb_size = 16 >> s->avctx->lowres;
1864 
1865  ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1867 
1868  s->mb_x = 0;
1869  s->mb_y += 1 << field_pic;
1870 
1871  if (s->mb_y >= s->mb_height) {
1872  int left = get_bits_left(&s->gb);
1873  int is_d10 = s->chroma_format == 2 &&
1874  s->pict_type == AV_PICTURE_TYPE_I &&
1875  avctx->profile == 0 && avctx->level == 5 &&
1876  s->intra_dc_precision == 2 &&
1877  s->q_scale_type == 1 && s->alternate_scan == 0 &&
1878  s->progressive_frame == 0
1879  /* vbv_delay == 0xBBB || 0xE10 */;
1880 
1881  if (left >= 32 && !is_d10) {
1882  GetBitContext gb = s->gb;
1883  align_get_bits(&gb);
1884  if (show_bits(&gb, 24) == 0x060E2B) {
1885  av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1886  is_d10 = 1;
1887  }
1888  }
1889 
1890  if (left < 0 ||
1891  (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1892  ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1893  av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1894  left, show_bits(&s->gb, FFMIN(left, 23)));
1895  return -1;
1896  } else
1897  goto eos;
1898  }
1899  // There are some files out there which are missing the last slice
1900  // in cases where the slice is completely outside the visible
1901  // area, we detect this here instead of running into the end expecting
1902  // more data
1903  if (s->mb_y >= ((s->height + 15) >> 4) &&
1904  s->progressive_frame &&
1905  !s->progressive_sequence &&
1906  get_bits_left(&s->gb) <= 8 &&
1907  get_bits_left(&s->gb) >= 0 &&
1908  s->mb_skip_run == -1 &&
1909  show_bits(&s->gb, 8) == 0)
1910  goto eos;
1911 
1913  }
1914 
1915  /* skip mb handling */
1916  if (s->mb_skip_run == -1) {
1917  /* read increment again */
1918  s->mb_skip_run = 0;
1919  for (;;) {
1920  int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1921  MBINCR_VLC_BITS, 2);
1922  if (code < 0) {
1923  av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1924  return -1;
1925  }
1926  if (code >= 33) {
1927  if (code == 33) {
1928  s->mb_skip_run += 33;
1929  } else if (code == 35) {
1930  if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1931  av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1932  return -1;
1933  }
1934  goto eos; /* end of slice */
1935  }
1936  /* otherwise, stuffing, nothing to do */
1937  } else {
1938  s->mb_skip_run += code;
1939  break;
1940  }
1941  }
1942  if (s->mb_skip_run) {
1943  int i;
1944  if (s->pict_type == AV_PICTURE_TYPE_I) {
1946  "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1947  return -1;
1948  }
1949 
1950  /* skip mb */
1951  s->mb_intra = 0;
1952  for (i = 0; i < 12; i++)
1953  s->block_last_index[i] = -1;
1955  s->mv_type = MV_TYPE_16X16;
1956  else
1957  s->mv_type = MV_TYPE_FIELD;
1958  if (s->pict_type == AV_PICTURE_TYPE_P) {
1959  /* if P type, zero motion vector is implied */
1960  s->mv_dir = MV_DIR_FORWARD;
1961  s->mv[0][0][0] = s->mv[0][0][1] = 0;
1962  s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1963  s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1964  s->field_select[0][0] = (s->picture_structure - 1) & 1;
1965  } else {
1966  /* if B type, reuse previous vectors and directions */
1967  s->mv[0][0][0] = s->last_mv[0][0][0];
1968  s->mv[0][0][1] = s->last_mv[0][0][1];
1969  s->mv[1][0][0] = s->last_mv[1][0][0];
1970  s->mv[1][0][1] = s->last_mv[1][0][1];
1971  }
1972  }
1973  }
1974  }
1975 eos: // end of slice
1976  if (get_bits_left(&s->gb) < 0) {
1977  av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1978  return AVERROR_INVALIDDATA;
1979  }
1980  *buf += (get_bits_count(&s->gb) - 1) / 8;
1981  av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1982  return 0;
1983 }
1984 
1986 {
1987  MpegEncContext *s = *(void **) arg;
1988  const uint8_t *buf = s->gb.buffer;
1989  int mb_y = s->start_mb_y;
1990  const int field_pic = s->picture_structure != PICT_FRAME;
1991 
1992  s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1993 
1994  for (;;) {
1995  uint32_t start_code;
1996  int ret;
1997 
1998  ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1999  emms_c();
2000  av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2001  ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2002  s->start_mb_y, s->end_mb_y, s->er.error_count);
2003  if (ret < 0) {
2004  if (c->err_recognition & AV_EF_EXPLODE)
2005  return ret;
2006  if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2008  s->mb_x, s->mb_y,
2010  } else {
2012  s->mb_x - 1, s->mb_y,
2014  }
2015 
2016  if (s->mb_y == s->end_mb_y)
2017  return 0;
2018 
2019  start_code = -1;
2020  buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2021  mb_y = start_code - SLICE_MIN_START_CODE;
2022  if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2023  mb_y += (*buf&0xE0)<<2;
2024  mb_y <<= field_pic;
2026  mb_y++;
2027  if (mb_y < 0 || mb_y >= s->end_mb_y)
2028  return -1;
2029  }
2030 }
2031 
2032 /**
2033  * Handle slice ends.
2034  * @return 1 if it seems to be the last slice
2035  */
2036 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2037 {
2038  Mpeg1Context *s1 = avctx->priv_data;
2039  MpegEncContext *s = &s1->mpeg_enc_ctx;
2040 
2042  return 0;
2043 
2044  if (s->avctx->hwaccel) {
2045  if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2046  av_log(avctx, AV_LOG_ERROR,
2047  "hardware accelerator failed to decode picture\n");
2048  }
2049 
2050  /* end of slice reached */
2051  if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2052  /* end of image */
2053 
2054  ff_er_frame_end(&s->er);
2055 
2056  ff_mpv_frame_end(s);
2057 
2058  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2059  int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2060  if (ret < 0)
2061  return ret;
2064  } else {
2065  if (avctx->active_thread_type & FF_THREAD_FRAME)
2066  s->picture_number++;
2067  /* latency of 1 frame for I- and P-frames */
2068  /* XXX: use another variable than picture_number */
2069  if (s->last_picture_ptr) {
2070  int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2071  if (ret < 0)
2072  return ret;
2075  }
2076  }
2077 
2078  return 1;
2079  } else {
2080  return 0;
2081  }
2082 }
2083 
2085  const uint8_t *buf, int buf_size)
2086 {
2087  Mpeg1Context *s1 = avctx->priv_data;
2088  MpegEncContext *s = &s1->mpeg_enc_ctx;
2089  int width, height;
2090  int i, v, j;
2091 
2092  init_get_bits(&s->gb, buf, buf_size * 8);
2093 
2094  width = get_bits(&s->gb, 12);
2095  height = get_bits(&s->gb, 12);
2096  if (width == 0 || height == 0) {
2097  av_log(avctx, AV_LOG_WARNING,
2098  "Invalid horizontal or vertical size value.\n");
2100  return AVERROR_INVALIDDATA;
2101  }
2102  s->aspect_ratio_info = get_bits(&s->gb, 4);
2103  if (s->aspect_ratio_info == 0) {
2104  av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2106  return -1;
2107  }
2108  s->frame_rate_index = get_bits(&s->gb, 4);
2109  if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2110  return -1;
2111  s->bit_rate = get_bits(&s->gb, 18) * 400;
2112  if (get_bits1(&s->gb) == 0) /* marker */
2113  return -1;
2114  s->width = width;
2115  s->height = height;
2116 
2117  s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2118  skip_bits(&s->gb, 1);
2119 
2120  /* get matrix */
2121  if (get_bits1(&s->gb)) {
2123  } else {
2124  for (i = 0; i < 64; i++) {
2125  j = s->idsp.idct_permutation[i];
2127  s->intra_matrix[j] = v;
2128  s->chroma_intra_matrix[j] = v;
2129  }
2130  }
2131  if (get_bits1(&s->gb)) {
2133  } else {
2134  for (i = 0; i < 64; i++) {
2135  int j = s->idsp.idct_permutation[i];
2137  s->inter_matrix[j] = v;
2138  s->chroma_inter_matrix[j] = v;
2139  }
2140  }
2141 
2142  if (show_bits(&s->gb, 23) != 0) {
2143  av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2144  return -1;
2145  }
2146 
2147  /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2148  s->progressive_sequence = 1;
2149  s->progressive_frame = 1;
2151  s->first_field = 0;
2152  s->frame_pred_frame_dct = 1;
2153  s->chroma_format = 1;
2154  s->codec_id =
2156  s->out_format = FMT_MPEG1;
2157  s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2158  if (s->flags & CODEC_FLAG_LOW_DELAY)
2159  s->low_delay = 1;
2160 
2161  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2162  av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2163  s->avctx->rc_buffer_size, s->bit_rate);
2164 
2165  return 0;
2166 }
2167 
2169 {
2170  Mpeg1Context *s1 = avctx->priv_data;
2171  MpegEncContext *s = &s1->mpeg_enc_ctx;
2172  int i, v;
2173 
2174  /* start new MPEG-1 context decoding */
2175  s->out_format = FMT_MPEG1;
2176  if (s1->mpeg_enc_ctx_allocated) {
2177  ff_mpv_common_end(s);
2178  s1->mpeg_enc_ctx_allocated = 0;
2179  }
2180  s->width = avctx->coded_width;
2181  s->height = avctx->coded_height;
2182  avctx->has_b_frames = 0; // true?
2183  s->low_delay = 1;
2184 
2185  avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2186  setup_hwaccel_for_pixfmt(avctx);
2187 
2188  ff_mpv_idct_init(s);
2189  if (ff_mpv_common_init(s) < 0)
2190  return -1;
2191  s1->mpeg_enc_ctx_allocated = 1;
2192 
2193  for (i = 0; i < 64; i++) {
2194  int j = s->idsp.idct_permutation[i];
2196  s->intra_matrix[j] = v;
2197  s->chroma_intra_matrix[j] = v;
2198 
2200  s->inter_matrix[j] = v;
2201  s->chroma_inter_matrix[j] = v;
2202  }
2203 
2204  s->progressive_sequence = 1;
2205  s->progressive_frame = 1;
2207  s->first_field = 0;
2208  s->frame_pred_frame_dct = 1;
2209  s->chroma_format = 1;
2210  if (s->codec_tag == AV_RL32("BW10")) {
2212  } else {
2213  s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2215  }
2216  s1->save_width = s->width;
2217  s1->save_height = s->height;
2219  return 0;
2220 }
2221 
2223  const uint8_t *p, int buf_size)
2224 {
2225  Mpeg1Context *s1 = avctx->priv_data;
2226 
2227  if (buf_size >= 6 &&
2228  p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2229  p[4] == 3 && (p[5] & 0x40)) {
2230  /* extract A53 Part 4 CC data */
2231  int cc_count = p[5] & 0x1f;
2232  if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2233  av_freep(&s1->a53_caption);
2234  s1->a53_caption_size = cc_count * 3;
2236  if (s1->a53_caption)
2237  memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2238  }
2239  return 1;
2240  } else if (buf_size >= 11 &&
2241  p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2242  /* extract DVD CC data */
2243  int cc_count = 0;
2244  int i;
2245  // There is a caption count field in the data, but it is often
2246  // incorect. So count the number of captions present.
2247  for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2248  cc_count++;
2249  // Transform the DVD format into A53 Part 4 format
2250  if (cc_count > 0) {
2251  av_freep(&s1->a53_caption);
2252  s1->a53_caption_size = cc_count * 6;
2254  if (s1->a53_caption) {
2255  uint8_t field1 = !!(p[4] & 0x80);
2256  uint8_t *cap = s1->a53_caption;
2257  p += 5;
2258  for (i = 0; i < cc_count; i++) {
2259  cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2260  cap[1] = p[1];
2261  cap[2] = p[2];
2262  cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2263  cap[4] = p[4];
2264  cap[5] = p[5];
2265  cap += 6;
2266  p += 6;
2267  }
2268  }
2269  }
2270  return 1;
2271  }
2272  return 0;
2273 }
2274 
2276  const uint8_t *p, int buf_size)
2277 {
2278  Mpeg1Context *s = avctx->priv_data;
2279  const uint8_t *buf_end = p + buf_size;
2280  Mpeg1Context *s1 = avctx->priv_data;
2281 
2282  if (buf_size > 29){
2283  int i;
2284  for(i=0; i<20; i++)
2285  if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2286  s->tmpgexs= 1;
2287  }
2288 
2289 /* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2290  av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2291  }
2292  av_log(avctx, AV_LOG_ERROR, "\n");*/
2293  }
2294 
2295  /* we parse the DTG active format information */
2296  if (buf_end - p >= 5 &&
2297  p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2298  int flags = p[4];
2299  p += 5;
2300  if (flags & 0x80) {
2301  /* skip event id */
2302  p += 2;
2303  }
2304  if (flags & 0x40) {
2305  if (buf_end - p < 1)
2306  return;
2307 #if FF_API_AFD
2309  avctx->dtg_active_format = p[0] & 0x0f;
2311 #endif /* FF_API_AFD */
2312  s1->has_afd = 1;
2313  s1->afd = p[0] & 0x0f;
2314  }
2315  } else if (buf_end - p >= 6 &&
2316  p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2317  p[4] == 0x03) { // S3D_video_format_length
2318  // the 0x7F mask ignores the reserved_bit value
2319  const uint8_t S3D_video_format_type = p[5] & 0x7F;
2320 
2321  if (S3D_video_format_type == 0x03 ||
2322  S3D_video_format_type == 0x04 ||
2323  S3D_video_format_type == 0x08 ||
2324  S3D_video_format_type == 0x23) {
2325 
2326  s1->has_stereo3d = 1;
2327 
2328  switch (S3D_video_format_type) {
2329  case 0x03:
2331  break;
2332  case 0x04:
2334  break;
2335  case 0x08:
2337  break;
2338  case 0x23:
2340  break;
2341  }
2342  }
2343  } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2344  return;
2345  }
2346 }
2347 
2348 static void mpeg_decode_gop(AVCodecContext *avctx,
2349  const uint8_t *buf, int buf_size)
2350 {
2351  Mpeg1Context *s1 = avctx->priv_data;
2352  MpegEncContext *s = &s1->mpeg_enc_ctx;
2353  int broken_link;
2354  int64_t tc;
2355 
2356  init_get_bits(&s->gb, buf, buf_size * 8);
2357 
2358  tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2359 
2360  s->closed_gop = get_bits1(&s->gb);
2361  /* broken_link indicate that after editing the
2362  * reference frames of the first B-Frames after GOP I-Frame
2363  * are missing (open gop) */
2364  broken_link = get_bits1(&s->gb);
2365 
2366  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2367  char tcbuf[AV_TIMECODE_STR_SIZE];
2370  "GOP (%s) closed_gop=%d broken_link=%d\n",
2371  tcbuf, s->closed_gop, broken_link);
2372  }
2373 }
2374 
2375 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2376  int *got_output, const uint8_t *buf, int buf_size)
2377 {
2378  Mpeg1Context *s = avctx->priv_data;
2380  const uint8_t *buf_ptr = buf;
2381  const uint8_t *buf_end = buf + buf_size;
2382  int ret, input_size;
2383  int last_code = 0, skip_frame = 0;
2384  int picture_start_code_seen = 0;
2385 
2386  for (;;) {
2387  /* find next start code */
2388  uint32_t start_code = -1;
2389  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2390  if (start_code > 0x1ff) {
2391  if (!skip_frame) {
2392  if (HAVE_THREADS &&
2393  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2394  !avctx->hwaccel) {
2395  int i;
2396  av_assert0(avctx->thread_count > 1);
2397 
2398  avctx->execute(avctx, slice_decode_thread,
2399  &s2->thread_context[0], NULL,
2400  s->slice_count, sizeof(void *));
2401  for (i = 0; i < s->slice_count; i++)
2402  s2->er.error_count += s2->thread_context[i]->er.error_count;
2403  }
2404 
2405  if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2406  && uses_vdpau(avctx))
2407  ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2408 
2409  ret = slice_end(avctx, picture);
2410  if (ret < 0)
2411  return ret;
2412  else if (ret) {
2413  // FIXME: merge with the stuff in mpeg_decode_slice
2414  if (s2->last_picture_ptr || s2->low_delay)
2415  *got_output = 1;
2416  }
2417  }
2418  s2->pict_type = 0;
2419 
2420  if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2421  return AVERROR_INVALIDDATA;
2422 
2423  return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2424  }
2425 
2426  input_size = buf_end - buf_ptr;
2427 
2428  if (avctx->debug & FF_DEBUG_STARTCODE)
2429  av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2430  start_code, buf_ptr - buf, input_size);
2431 
2432  /* prepare data for next start code */
2433  switch (start_code) {
2434  case SEQ_START_CODE:
2435  if (last_code == 0) {
2436  mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2437  if (buf != avctx->extradata)
2438  s->sync = 1;
2439  } else {
2440  av_log(avctx, AV_LOG_ERROR,
2441  "ignoring SEQ_START_CODE after %X\n", last_code);
2442  if (avctx->err_recognition & AV_EF_EXPLODE)
2443  return AVERROR_INVALIDDATA;
2444  }
2445  break;
2446 
2447  case PICTURE_START_CODE:
2448  if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2449  /* If it's a frame picture, there can't be more than one picture header.
2450  Yet, it does happen and we need to handle it. */
2451  av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2452  break;
2453  }
2454  picture_start_code_seen = 1;
2455 
2456  if (s2->width <= 0 || s2->height <= 0) {
2457  av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2458  s2->width, s2->height);
2459  return AVERROR_INVALIDDATA;
2460  }
2461 
2462  if (s->tmpgexs){
2463  s2->intra_dc_precision= 3;
2464  s2->intra_matrix[0]= 1;
2465  }
2466  if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2467  !avctx->hwaccel && s->slice_count) {
2468  int i;
2469 
2470  avctx->execute(avctx, slice_decode_thread,
2471  s2->thread_context, NULL,
2472  s->slice_count, sizeof(void *));
2473  for (i = 0; i < s->slice_count; i++)
2474  s2->er.error_count += s2->thread_context[i]->er.error_count;
2475  s->slice_count = 0;
2476  }
2477  if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2478  ret = mpeg_decode_postinit(avctx);
2479  if (ret < 0) {
2480  av_log(avctx, AV_LOG_ERROR,
2481  "mpeg_decode_postinit() failure\n");
2482  return ret;
2483  }
2484 
2485  /* We have a complete image: we try to decompress it. */
2486  if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2487  s2->pict_type = 0;
2488  s->first_slice = 1;
2489  last_code = PICTURE_START_CODE;
2490  } else {
2491  av_log(avctx, AV_LOG_ERROR,
2492  "ignoring pic after %X\n", last_code);
2493  if (avctx->err_recognition & AV_EF_EXPLODE)
2494  return AVERROR_INVALIDDATA;
2495  }
2496  break;
2497  case EXT_START_CODE:
2498  init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2499 
2500  switch (get_bits(&s2->gb, 4)) {
2501  case 0x1:
2502  if (last_code == 0) {
2504  } else {
2505  av_log(avctx, AV_LOG_ERROR,
2506  "ignoring seq ext after %X\n", last_code);
2507  if (avctx->err_recognition & AV_EF_EXPLODE)
2508  return AVERROR_INVALIDDATA;
2509  }
2510  break;
2511  case 0x2:
2513  break;
2514  case 0x3:
2516  break;
2517  case 0x7:
2519  break;
2520  case 0x8:
2521  if (last_code == PICTURE_START_CODE) {
2523  } else {
2524  av_log(avctx, AV_LOG_ERROR,
2525  "ignoring pic cod ext after %X\n", last_code);
2526  if (avctx->err_recognition & AV_EF_EXPLODE)
2527  return AVERROR_INVALIDDATA;
2528  }
2529  break;
2530  }
2531  break;
2532  case USER_START_CODE:
2533  mpeg_decode_user_data(avctx, buf_ptr, input_size);
2534  break;
2535  case GOP_START_CODE:
2536  if (last_code == 0) {
2537  s2->first_field = 0;
2538  mpeg_decode_gop(avctx, buf_ptr, input_size);
2539  s->sync = 1;
2540  } else {
2541  av_log(avctx, AV_LOG_ERROR,
2542  "ignoring GOP_START_CODE after %X\n", last_code);
2543  if (avctx->err_recognition & AV_EF_EXPLODE)
2544  return AVERROR_INVALIDDATA;
2545  }
2546  break;
2547  default:
2548  if (start_code >= SLICE_MIN_START_CODE &&
2549  start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2550  if (s2->progressive_sequence && !s2->progressive_frame) {
2551  s2->progressive_frame = 1;
2552  av_log(s2->avctx, AV_LOG_ERROR,
2553  "interlaced frame in progressive sequence, ignoring\n");
2554  }
2555 
2556  if (s2->picture_structure == 0 ||
2558  av_log(s2->avctx, AV_LOG_ERROR,
2559  "picture_structure %d invalid, ignoring\n",
2560  s2->picture_structure);
2562  }
2563 
2565  av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2566 
2567  if (s2->picture_structure == PICT_FRAME) {
2568  s2->first_field = 0;
2569  s2->v_edge_pos = 16 * s2->mb_height;
2570  } else {
2571  s2->first_field ^= 1;
2572  s2->v_edge_pos = 8 * s2->mb_height;
2573  memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2574  }
2575  }
2576  if (start_code >= SLICE_MIN_START_CODE &&
2577  start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2578  const int field_pic = s2->picture_structure != PICT_FRAME;
2579  int mb_y = start_code - SLICE_MIN_START_CODE;
2580  last_code = SLICE_MIN_START_CODE;
2581  if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2582  mb_y += (*buf_ptr&0xE0)<<2;
2583 
2584  mb_y <<= field_pic;
2586  mb_y++;
2587 
2588  if (buf_end - buf_ptr < 2) {
2589  av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2590  return AVERROR_INVALIDDATA;
2591  }
2592 
2593  if (mb_y >= s2->mb_height) {
2594  av_log(s2->avctx, AV_LOG_ERROR,
2595  "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2596  return -1;
2597  }
2598 
2599  if (!s2->last_picture_ptr) {
2600  /* Skip B-frames if we do not have reference frames and
2601  * GOP is not closed. */
2602  if (s2->pict_type == AV_PICTURE_TYPE_B) {
2603  if (!s2->closed_gop) {
2604  skip_frame = 1;
2605  break;
2606  }
2607  }
2608  }
2610  s->sync = 1;
2611  if (!s2->next_picture_ptr) {
2612  /* Skip P-frames if we do not have a reference frame or
2613  * we have an invalid header. */
2614  if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2615  skip_frame = 1;
2616  break;
2617  }
2618  }
2619  if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2620  s2->pict_type == AV_PICTURE_TYPE_B) ||
2621  (avctx->skip_frame >= AVDISCARD_NONKEY &&
2622  s2->pict_type != AV_PICTURE_TYPE_I) ||
2623  avctx->skip_frame >= AVDISCARD_ALL) {
2624  skip_frame = 1;
2625  break;
2626  }
2627 
2628  if (!s->mpeg_enc_ctx_allocated)
2629  break;
2630 
2631  if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2632  if (mb_y < avctx->skip_top ||
2633  mb_y >= s2->mb_height - avctx->skip_bottom)
2634  break;
2635  }
2636 
2637  if (!s2->pict_type) {
2638  av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2639  if (avctx->err_recognition & AV_EF_EXPLODE)
2640  return AVERROR_INVALIDDATA;
2641  break;
2642  }
2643 
2644  if (s->first_slice) {
2645  skip_frame = 0;
2646  s->first_slice = 0;
2647  if (mpeg_field_start(s2, buf, buf_size) < 0)
2648  return -1;
2649  }
2650  if (!s2->current_picture_ptr) {
2651  av_log(avctx, AV_LOG_ERROR,
2652  "current_picture not initialized\n");
2653  return AVERROR_INVALIDDATA;
2654  }
2655 
2656  if (uses_vdpau(avctx)) {
2657  s->slice_count++;
2658  break;
2659  }
2660 
2661  if (HAVE_THREADS &&
2662  (avctx->active_thread_type & FF_THREAD_SLICE) &&
2663  !avctx->hwaccel) {
2664  int threshold = (s2->mb_height * s->slice_count +
2665  s2->slice_context_count / 2) /
2666  s2->slice_context_count;
2667  av_assert0(avctx->thread_count > 1);
2668  if (threshold <= mb_y) {
2669  MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2670 
2671  thread_context->start_mb_y = mb_y;
2672  thread_context->end_mb_y = s2->mb_height;
2673  if (s->slice_count) {
2674  s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2675  ret = ff_update_duplicate_context(thread_context, s2);
2676  if (ret < 0)
2677  return ret;
2678  }
2679  init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2680  s->slice_count++;
2681  }
2682  buf_ptr += 2; // FIXME add minimum number of bytes per slice
2683  } else {
2684  ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2685  emms_c();
2686 
2687  if (ret < 0) {
2688  if (avctx->err_recognition & AV_EF_EXPLODE)
2689  return ret;
2690  if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2691  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2692  s2->resync_mb_y, s2->mb_x, s2->mb_y,
2694  } else {
2695  ff_er_add_slice(&s2->er, s2->resync_mb_x,
2696  s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2698  }
2699  }
2700  }
2701  break;
2702  }
2703  }
2704 }
2705 
2706 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2707  int *got_output, AVPacket *avpkt)
2708 {
2709  const uint8_t *buf = avpkt->data;
2710  int ret;
2711  int buf_size = avpkt->size;
2712  Mpeg1Context *s = avctx->priv_data;
2713  AVFrame *picture = data;
2715 
2716  if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2717  /* special case for last picture */
2718  if (s2->low_delay == 0 && s2->next_picture_ptr) {
2719  int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2720  if (ret < 0)
2721  return ret;
2722 
2723  s2->next_picture_ptr = NULL;
2724 
2725  *got_output = 1;
2726  }
2727  return buf_size;
2728  }
2729 
2730  if (s2->flags & CODEC_FLAG_TRUNCATED) {
2731  int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2732  buf_size, NULL);
2733 
2734  if (ff_combine_frame(&s2->parse_context, next,
2735  (const uint8_t **) &buf, &buf_size) < 0)
2736  return buf_size;
2737  }
2738 
2739  s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2740  if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2741  || s2->codec_tag == AV_RL32("BW10")
2742  ))
2743  vcr2_init_sequence(avctx);
2744 
2745  s->slice_count = 0;
2746 
2747  if (avctx->extradata && !s->extradata_decoded) {
2748  ret = decode_chunks(avctx, picture, got_output,
2749  avctx->extradata, avctx->extradata_size);
2750  if (*got_output) {
2751  av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2752  *got_output = 0;
2753  }
2754  s->extradata_decoded = 1;
2755  if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2756  s2->current_picture_ptr = NULL;
2757  return ret;
2758  }
2759  }
2760 
2761  ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2762  if (ret<0 || *got_output)
2763  s2->current_picture_ptr = NULL;
2764 
2765  return ret;
2766 }
2767 
2768 static void flush(AVCodecContext *avctx)
2769 {
2770  Mpeg1Context *s = avctx->priv_data;
2771 
2772  s->sync = 0;
2773 
2774  ff_mpeg_flush(avctx);
2775 }
2776 
2778 {
2779  Mpeg1Context *s = avctx->priv_data;
2780 
2781  if (s->mpeg_enc_ctx_allocated)
2783  av_freep(&s->a53_caption);
2784  return 0;
2785 }
2786 
2788  { FF_PROFILE_MPEG2_422, "4:2:2" },
2789  { FF_PROFILE_MPEG2_HIGH, "High" },
2790  { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2791  { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2792  { FF_PROFILE_MPEG2_MAIN, "Main" },
2793  { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2794  { FF_PROFILE_RESERVED, "Reserved" },
2795  { FF_PROFILE_RESERVED, "Reserved" },
2796  { FF_PROFILE_UNKNOWN },
2797 };
2798 
2800  .name = "mpeg1video",
2801  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2802  .type = AVMEDIA_TYPE_VIDEO,
2803  .id = AV_CODEC_ID_MPEG1VIDEO,
2804  .priv_data_size = sizeof(Mpeg1Context),
2808  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2811  .flush = flush,
2812  .max_lowres = 3,
2814 };
2815 
2817  .name = "mpeg2video",
2818  .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2819  .type = AVMEDIA_TYPE_VIDEO,
2820  .id = AV_CODEC_ID_MPEG2VIDEO,
2821  .priv_data_size = sizeof(Mpeg1Context),
2825  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2828  .flush = flush,
2829  .max_lowres = 3,
2830  .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2831 };
2832 
2833 //legacy decoder
2835  .name = "mpegvideo",
2836  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2837  .type = AVMEDIA_TYPE_VIDEO,
2838  .id = AV_CODEC_ID_MPEG2VIDEO,
2839  .priv_data_size = sizeof(Mpeg1Context),
2844  .flush = flush,
2845  .max_lowres = 3,
2846 };
2847 
2848 #if FF_API_XVMC
2849 #if CONFIG_MPEG_XVMC_DECODER
2850 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2851 {
2852  if (avctx->active_thread_type & FF_THREAD_SLICE)
2853  return -1;
2854  if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2855  return -1;
2856  if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2857  av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2858  }
2859  mpeg_decode_init(avctx);
2860 
2862  avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2863 
2864  return 0;
2865 }
2866 
2867 AVCodec ff_mpeg_xvmc_decoder = {
2868  .name = "mpegvideo_xvmc",
2869  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2870  .type = AVMEDIA_TYPE_VIDEO,
2871  .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2872  .priv_data_size = sizeof(Mpeg1Context),
2873  .init = mpeg_mc_decode_init,
2876  .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2877  CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2878  .flush = flush,
2879 };
2880 
2881 #endif
2882 #endif /* FF_API_XVMC */
2883 
2884 #if CONFIG_MPEG_VDPAU_DECODER
2885 AVCodec ff_mpeg_vdpau_decoder = {
2886  .name = "mpegvideo_vdpau",
2887  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2888  .type = AVMEDIA_TYPE_VIDEO,
2889  .id = AV_CODEC_ID_MPEG2VIDEO,
2890  .priv_data_size = sizeof(Mpeg1Context),
2894  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2896  .flush = flush,
2897 };
2898 #endif
2899 
2900 #if CONFIG_MPEG1_VDPAU_DECODER
2901 AVCodec ff_mpeg1_vdpau_decoder = {
2902  .name = "mpeg1video_vdpau",
2903  .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2904  .type = AVMEDIA_TYPE_VIDEO,
2905  .id = AV_CODEC_ID_MPEG1VIDEO,
2906  .priv_data_size = sizeof(Mpeg1Context),
2910  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2912  .flush = flush,
2913 };
2914 #endif