FFmpeg  4.4
nutdec.c
Go to the documentation of this file.
1 /*
2  * "NUT" Container Format demuxer
3  * Copyright (c) 2004-2006 Michael Niedermayer
4  * Copyright (c) 2003 Alex Beregszaszi
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 #include "libavutil/avstring.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/bswap.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/tree.h"
30 #include "libavcodec/bytestream.h"
31 #include "avio_internal.h"
32 #include "isom.h"
33 #include "nut.h"
34 #include "riff.h"
35 
36 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
37 
38 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
39  int64_t *pos_arg, int64_t pos_limit);
40 
41 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
42 {
43  unsigned int len = ffio_read_varlen(bc);
44 
45  if (len && maxlen)
46  avio_read(bc, string, FFMIN(len, maxlen));
47  while (len > maxlen) {
48  avio_r8(bc);
49  len--;
50  if (bc->eof_reached)
51  len = maxlen;
52  }
53 
54  if (maxlen)
55  string[FFMIN(len, maxlen - 1)] = 0;
56 
57  if (bc->eof_reached)
58  return AVERROR_EOF;
59  if (maxlen == len)
60  return -1;
61  else
62  return 0;
63 }
64 
65 static int64_t get_s(AVIOContext *bc)
66 {
67  int64_t v = ffio_read_varlen(bc) + 1;
68 
69  if (v & 1)
70  return -(v >> 1);
71  else
72  return (v >> 1);
73 }
74 
75 static uint64_t get_fourcc(AVIOContext *bc)
76 {
77  unsigned int len = ffio_read_varlen(bc);
78 
79  if (len == 2)
80  return avio_rl16(bc);
81  else if (len == 4)
82  return avio_rl32(bc);
83  else {
84  av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len);
85  return -1;
86  }
87 }
88 
90  int calculate_checksum, uint64_t startcode)
91 {
92  int64_t size;
93 
94  startcode = av_be2ne64(startcode);
95  startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
96 
98  size = ffio_read_varlen(bc);
99  if (size > 4096)
100  avio_rb32(bc);
101  if (ffio_get_checksum(bc) && size > 4096)
102  return -1;
103 
104  ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
105 
106  return size;
107 }
108 
109 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
110 {
111  uint64_t state = 0;
112 
113  if (pos >= 0)
114  /* Note, this may fail if the stream is not seekable, but that should
115  * not matter, as in this case we simply start where we currently are */
116  avio_seek(bc, pos, SEEK_SET);
117  while (!avio_feof(bc)) {
118  state = (state << 8) | avio_r8(bc);
119  if ((state >> 56) != 'N')
120  continue;
121  switch (state) {
122  case MAIN_STARTCODE:
123  case STREAM_STARTCODE:
124  case SYNCPOINT_STARTCODE:
125  case INFO_STARTCODE:
126  case INDEX_STARTCODE:
127  return state;
128  }
129  }
130 
131  return 0;
132 }
133 
134 /**
135  * Find the given startcode.
136  * @param code the startcode
137  * @param pos the start position of the search, or -1 if the current position
138  * @return the position of the startcode or -1 if not found
139  */
140 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
141 {
142  for (;;) {
143  uint64_t startcode = find_any_startcode(bc, pos);
144  if (startcode == code)
145  return avio_tell(bc) - 8;
146  else if (startcode == 0)
147  return -1;
148  pos = -1;
149  }
150 }
151 
152 static int nut_probe(const AVProbeData *p)
153 {
154  int i;
155 
156  for (i = 0; i < p->buf_size-8; i++) {
157  if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
158  continue;
159  if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
160  return AVPROBE_SCORE_MAX;
161  }
162  return 0;
163 }
164 
165 #define GET_V(dst, check) \
166  do { \
167  tmp = ffio_read_varlen(bc); \
168  if (!(check)) { \
169  av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
170  ret = AVERROR_INVALIDDATA; \
171  goto fail; \
172  } \
173  dst = tmp; \
174  } while (0)
175 
176 static int skip_reserved(AVIOContext *bc, int64_t pos)
177 {
178  pos -= avio_tell(bc);
179  if (pos < 0) {
180  avio_seek(bc, pos, SEEK_CUR);
181  return AVERROR_INVALIDDATA;
182  } else {
183  while (pos--) {
184  if (bc->eof_reached)
185  return AVERROR_INVALIDDATA;
186  avio_r8(bc);
187  }
188  return 0;
189  }
190 }
191 
193 {
194  AVFormatContext *s = nut->avf;
195  AVIOContext *bc = s->pb;
196  uint64_t tmp, end, length;
197  unsigned int stream_count;
198  int i, j, count, ret;
199  int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
200 
201  length = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
202  end = length + avio_tell(bc);
203 
204  nut->version = ffio_read_varlen(bc);
205  if (nut->version < NUT_MIN_VERSION ||
206  nut->version > NUT_MAX_VERSION) {
207  av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
208  nut->version);
209  return AVERROR(ENOSYS);
210  }
211  if (nut->version > 3)
212  nut->minor_version = ffio_read_varlen(bc);
213 
214  GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
215 
216  nut->max_distance = ffio_read_varlen(bc);
217  if (nut->max_distance > 65536) {
218  av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
219  nut->max_distance = 65536;
220  }
221 
222  GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational) && tmp < length/2);
223  nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational));
224  if (!nut->time_base)
225  return AVERROR(ENOMEM);
226 
227  for (i = 0; i < nut->time_base_count; i++) {
228  GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
229  GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
230  if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
231  av_log(s, AV_LOG_ERROR, "invalid time base %d/%d\n",
232  nut->time_base[i].num,
233  nut->time_base[i].den);
234  ret = AVERROR_INVALIDDATA;
235  goto fail;
236  }
237  }
238  tmp_pts = 0;
239  tmp_mul = 1;
240  tmp_stream = 0;
241  tmp_head_idx = 0;
242  for (i = 0; i < 256;) {
243  int tmp_flags = ffio_read_varlen(bc);
244  int tmp_fields = ffio_read_varlen(bc);
245 
246  if (tmp_fields > 0)
247  tmp_pts = get_s(bc);
248  if (tmp_fields > 1)
249  tmp_mul = ffio_read_varlen(bc);
250  if (tmp_fields > 2)
251  tmp_stream = ffio_read_varlen(bc);
252  if (tmp_fields > 3)
253  tmp_size = ffio_read_varlen(bc);
254  else
255  tmp_size = 0;
256  if (tmp_fields > 4)
257  tmp_res = ffio_read_varlen(bc);
258  else
259  tmp_res = 0;
260  if (tmp_fields > 5)
261  count = ffio_read_varlen(bc);
262  else
263  count = tmp_mul - (unsigned)tmp_size;
264  if (tmp_fields > 6)
265  get_s(bc);
266  if (tmp_fields > 7)
267  tmp_head_idx = ffio_read_varlen(bc);
268 
269  while (tmp_fields-- > 8) {
270  if (bc->eof_reached) {
271  av_log(s, AV_LOG_ERROR, "reached EOF while decoding main header\n");
272  ret = AVERROR_INVALIDDATA;
273  goto fail;
274  }
275  ffio_read_varlen(bc);
276  }
277 
278  if (count <= 0 || count > 256 - (i <= 'N') - i) {
279  av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
280  ret = AVERROR_INVALIDDATA;
281  goto fail;
282  }
283  if (tmp_stream >= stream_count) {
284  av_log(s, AV_LOG_ERROR, "illegal stream number %d >= %d\n",
285  tmp_stream, stream_count);
286  ret = AVERROR_INVALIDDATA;
287  goto fail;
288  }
289 
290  for (j = 0; j < count; j++, i++) {
291  if (i == 'N') {
292  nut->frame_code[i].flags = FLAG_INVALID;
293  j--;
294  continue;
295  }
296  nut->frame_code[i].flags = tmp_flags;
297  nut->frame_code[i].pts_delta = tmp_pts;
298  nut->frame_code[i].stream_id = tmp_stream;
299  nut->frame_code[i].size_mul = tmp_mul;
300  nut->frame_code[i].size_lsb = tmp_size + j;
301  nut->frame_code[i].reserved_count = tmp_res;
302  nut->frame_code[i].header_idx = tmp_head_idx;
303  }
304  }
305  av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
306 
307  if (end > avio_tell(bc) + 4) {
308  int rem = 1024;
309  GET_V(nut->header_count, tmp < 128U);
310  nut->header_count++;
311  for (i = 1; i < nut->header_count; i++) {
312  uint8_t *hdr;
313  GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
314  if (rem < nut->header_len[i]) {
316  "invalid elision header %d : %d > %d\n",
317  i, nut->header_len[i], rem);
318  ret = AVERROR_INVALIDDATA;
319  goto fail;
320  }
321  rem -= nut->header_len[i];
322  hdr = av_malloc(nut->header_len[i]);
323  if (!hdr) {
324  ret = AVERROR(ENOMEM);
325  goto fail;
326  }
327  avio_read(bc, hdr, nut->header_len[i]);
328  nut->header[i] = hdr;
329  }
330  av_assert0(nut->header_len[0] == 0);
331  }
332 
333  // flags had been effectively introduced in version 4
334  if (nut->version > 3 && end > avio_tell(bc) + 4) {
335  nut->flags = ffio_read_varlen(bc);
336  }
337 
338  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
339  av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
340  ret = AVERROR_INVALIDDATA;
341  goto fail;
342  }
343 
344  nut->stream = av_calloc(stream_count, sizeof(StreamContext));
345  if (!nut->stream) {
346  ret = AVERROR(ENOMEM);
347  goto fail;
348  }
349  for (i = 0; i < stream_count; i++)
351 
352  return 0;
353 fail:
354  av_freep(&nut->time_base);
355  for (i = 1; i < nut->header_count; i++) {
356  av_freep(&nut->header[i]);
357  }
358  nut->header_count = 0;
359  return ret;
360 }
361 
363 {
364  AVFormatContext *s = nut->avf;
365  AVIOContext *bc = s->pb;
366  StreamContext *stc;
367  int class, stream_id, ret;
368  uint64_t tmp, end;
369  AVStream *st = NULL;
370 
371  end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
372  end += avio_tell(bc);
373 
374  GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
375  stc = &nut->stream[stream_id];
376  st = s->streams[stream_id];
377  if (!st)
378  return AVERROR(ENOMEM);
379 
380  class = ffio_read_varlen(bc);
381  tmp = get_fourcc(bc);
382  st->codecpar->codec_tag = tmp;
383  switch (class) {
384  case 0:
386  st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
390  0
391  },
392  tmp);
393  break;
394  case 1:
396  st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
400  0
401  },
402  tmp);
403  break;
404  case 2:
407  break;
408  case 3:
411  break;
412  default:
413  av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
414  return AVERROR(ENOSYS);
415  }
416  if (class < 3 && st->codecpar->codec_id == AV_CODEC_ID_NONE)
418  "Unknown codec tag '0x%04x' for stream number %d\n",
419  (unsigned int) tmp, stream_id);
420 
421  GET_V(stc->time_base_id, tmp < nut->time_base_count);
422  GET_V(stc->msb_pts_shift, tmp < 16);
424  GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
425  st->codecpar->video_delay = stc->decode_delay;
426  ffio_read_varlen(bc); // stream flags
427 
428  GET_V(st->codecpar->extradata_size, tmp < (1 << 30));
429  if (st->codecpar->extradata_size) {
430  ret = ff_get_extradata(s, st->codecpar, bc,
431  st->codecpar->extradata_size);
432  if (ret < 0)
433  return ret;
434  }
435 
436  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
437  GET_V(st->codecpar->width, tmp > 0);
438  GET_V(st->codecpar->height, tmp > 0);
441  if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
442  av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
444  ret = AVERROR_INVALIDDATA;
445  goto fail;
446  }
447  ffio_read_varlen(bc); /* csp type */
448  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
449  GET_V(st->codecpar->sample_rate, tmp > 0);
450  ffio_read_varlen(bc); // samplerate_den
451  GET_V(st->codecpar->channels, tmp > 0);
452  }
453  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
455  "stream header %d checksum mismatch\n", stream_id);
456  ret = AVERROR_INVALIDDATA;
457  goto fail;
458  }
459  stc->time_base = &nut->time_base[stc->time_base_id];
460  avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
461  stc->time_base->den);
462  return 0;
463 fail:
464  if (st && st->codecpar) {
465  av_freep(&st->codecpar->extradata);
466  st->codecpar->extradata_size = 0;
467  }
468  return ret;
469 }
470 
472  int stream_id)
473 {
474  int flag = 0, i;
475 
476  for (i = 0; ff_nut_dispositions[i].flag; ++i)
477  if (!strcmp(ff_nut_dispositions[i].str, value))
479  if (!flag)
480  av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
481  for (i = 0; i < avf->nb_streams; ++i)
482  if (stream_id == i || stream_id == -1)
483  avf->streams[i]->disposition |= flag;
484 }
485 
487 {
488  AVFormatContext *s = nut->avf;
489  AVIOContext *bc = s->pb;
490  uint64_t tmp, chapter_start, chapter_len;
491  unsigned int stream_id_plus1, count;
492  int i, ret = 0;
493  int64_t chapter_id, value, end;
494  char name[256], str_value[1024], type_str[256];
495  const char *type;
496  int *event_flags = NULL;
497  AVChapter *chapter = NULL;
498  AVStream *st = NULL;
499  AVDictionary **metadata = NULL;
500  int metadata_flag = 0;
501 
502  end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
503  end += avio_tell(bc);
504 
505  GET_V(stream_id_plus1, tmp <= s->nb_streams);
506  chapter_id = get_s(bc);
507  chapter_start = ffio_read_varlen(bc);
508  chapter_len = ffio_read_varlen(bc);
509  count = ffio_read_varlen(bc);
510 
511  if (chapter_id && !stream_id_plus1) {
512  int64_t start = chapter_start / nut->time_base_count;
513  chapter = avpriv_new_chapter(s, chapter_id,
514  nut->time_base[chapter_start %
515  nut->time_base_count],
516  start, start + chapter_len, NULL);
517  if (!chapter) {
518  av_log(s, AV_LOG_ERROR, "Could not create chapter.\n");
519  return AVERROR(ENOMEM);
520  }
521  metadata = &chapter->metadata;
522  } else if (stream_id_plus1) {
523  st = s->streams[stream_id_plus1 - 1];
524  metadata = &st->metadata;
525  event_flags = &st->event_flags;
526  metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
527  } else {
528  metadata = &s->metadata;
529  event_flags = &s->event_flags;
530  metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
531  }
532 
533  for (i = 0; i < count; i++) {
534  ret = get_str(bc, name, sizeof(name));
535  if (ret < 0) {
536  av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
537  return ret;
538  }
539  value = get_s(bc);
540  str_value[0] = 0;
541 
542  if (value == -1) {
543  type = "UTF-8";
544  ret = get_str(bc, str_value, sizeof(str_value));
545  } else if (value == -2) {
546  ret = get_str(bc, type_str, sizeof(type_str));
547  if (ret < 0) {
548  av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
549  return ret;
550  }
551  type = type_str;
552  ret = get_str(bc, str_value, sizeof(str_value));
553  } else if (value == -3) {
554  type = "s";
555  value = get_s(bc);
556  } else if (value == -4) {
557  type = "t";
558  value = ffio_read_varlen(bc);
559  } else if (value < -4) {
560  type = "r";
561  get_s(bc);
562  } else {
563  type = "v";
564  }
565 
566  if (ret < 0) {
567  av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
568  return ret;
569  }
570 
571  if (stream_id_plus1 > s->nb_streams) {
573  "invalid stream id %d for info packet\n",
574  stream_id_plus1);
575  continue;
576  }
577 
578  if (!strcmp(type, "UTF-8")) {
579  if (chapter_id == 0 && !strcmp(name, "Disposition")) {
580  set_disposition_bits(s, str_value, stream_id_plus1 - 1);
581  continue;
582  }
583 
584  if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
585  sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
586  if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den ||
587  st->r_frame_rate.num < 0 || st->r_frame_rate.den < 0)
588  st->r_frame_rate.num = st->r_frame_rate.den = 0;
589  continue;
590  }
591 
592  if (metadata && av_strcasecmp(name, "Uses") &&
593  av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
594  if (event_flags)
595  *event_flags |= metadata_flag;
596  av_dict_set(metadata, name, str_value, 0);
597  }
598  }
599  }
600 
601  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
602  av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
603  return AVERROR_INVALIDDATA;
604  }
605 fail:
606  return FFMIN(ret, 0);
607 }
608 
609 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
610 {
611  AVFormatContext *s = nut->avf;
612  AVIOContext *bc = s->pb;
613  int64_t end;
614  uint64_t tmp;
615  int ret;
616 
617  nut->last_syncpoint_pos = avio_tell(bc) - 8;
618 
619  end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
620  end += avio_tell(bc);
621 
622  tmp = ffio_read_varlen(bc);
623  *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
624  if (*back_ptr < 0)
625  return AVERROR_INVALIDDATA;
626 
627  ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
628  tmp / nut->time_base_count);
629 
630  if (nut->flags & NUT_BROADCAST) {
631  tmp = ffio_read_varlen(bc);
632  av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
634  nut->time_base[tmp % nut->time_base_count],
635  AV_TIME_BASE_Q));
636  }
637 
638  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
639  av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
640  return AVERROR_INVALIDDATA;
641  }
642 
643  *ts = tmp / nut->time_base_count *
645 
646  if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
647  return ret;
648 
649  return 0;
650 }
651 
652 //FIXME calculate exactly, this is just a good approximation.
653 static int64_t find_duration(NUTContext *nut, int64_t filesize)
654 {
655  AVFormatContext *s = nut->avf;
656  int64_t duration = 0;
657 
659 
660  if(duration > 0)
661  s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
662  return duration;
663 }
664 
666 {
667  AVFormatContext *s = nut->avf;
668  AVIOContext *bc = s->pb;
669  uint64_t tmp, end;
670  int i, j, syncpoint_count;
671  int64_t filesize = avio_size(bc);
672  int64_t *syncpoints = NULL;
673  uint64_t max_pts;
674  int8_t *has_keyframe = NULL;
675  int ret = AVERROR_INVALIDDATA;
676 
677  if(filesize <= 0)
678  return -1;
679 
680  avio_seek(bc, filesize - 12, SEEK_SET);
681  avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
682  if (avio_rb64(bc) != INDEX_STARTCODE) {
683  av_log(s, AV_LOG_WARNING, "no index at the end\n");
684 
685  if(s->duration<=0)
686  s->duration = find_duration(nut, filesize);
687  return ret;
688  }
689 
690  end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
691  end += avio_tell(bc);
692 
693  max_pts = ffio_read_varlen(bc);
694  s->duration = av_rescale_q(max_pts / nut->time_base_count,
695  nut->time_base[max_pts % nut->time_base_count],
697  s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
698 
699  GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
700  syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
701  has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
702  if (!syncpoints || !has_keyframe) {
703  ret = AVERROR(ENOMEM);
704  goto fail;
705  }
706  for (i = 0; i < syncpoint_count; i++) {
707  syncpoints[i] = ffio_read_varlen(bc);
708  if (syncpoints[i] <= 0)
709  goto fail;
710  if (i)
711  syncpoints[i] += syncpoints[i - 1];
712  }
713 
714  for (i = 0; i < s->nb_streams; i++) {
715  int64_t last_pts = -1;
716  for (j = 0; j < syncpoint_count;) {
717  uint64_t x = ffio_read_varlen(bc);
718  int type = x & 1;
719  int n = j;
720  x >>= 1;
721  if (type) {
722  int flag = x & 1;
723  x >>= 1;
724  if (n + x >= syncpoint_count + 1) {
725  av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
726  goto fail;
727  }
728  while (x--)
729  has_keyframe[n++] = flag;
730  has_keyframe[n++] = !flag;
731  } else {
732  if (x <= 1) {
733  av_log(s, AV_LOG_ERROR, "index: x %"PRIu64" is invalid\n", x);
734  goto fail;
735  }
736  while (x != 1) {
737  if (n >= syncpoint_count + 1) {
738  av_log(s, AV_LOG_ERROR, "index overflow B\n");
739  goto fail;
740  }
741  has_keyframe[n++] = x & 1;
742  x >>= 1;
743  }
744  }
745  if (has_keyframe[0]) {
746  av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
747  goto fail;
748  }
749  av_assert0(n <= syncpoint_count + 1);
750  for (; j < n && j < syncpoint_count; j++) {
751  if (has_keyframe[j]) {
752  uint64_t B, A = ffio_read_varlen(bc);
753  if (!A) {
754  A = ffio_read_varlen(bc);
755  B = ffio_read_varlen(bc);
756  // eor_pts[j][i] = last_pts + A + B
757  } else
758  B = 0;
759  av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
760  last_pts + A, 0, 0, AVINDEX_KEYFRAME);
761  last_pts += A + B;
762  }
763  }
764  }
765  }
766 
767  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
768  av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
769  goto fail;
770  }
771  ret = 0;
772 
773 fail:
774  av_free(syncpoints);
775  av_free(has_keyframe);
776  return ret;
777 }
778 
780 {
781  NUTContext *nut = s->priv_data;
782  int i;
783 
784  av_freep(&nut->time_base);
785  av_freep(&nut->stream);
786  ff_nut_free_sp(nut);
787  for (i = 1; i < nut->header_count; i++)
788  av_freep(&nut->header[i]);
789 
790  return 0;
791 }
792 
794 {
795  NUTContext *nut = s->priv_data;
796  AVIOContext *bc = s->pb;
797  int64_t pos;
798  int initialized_stream_count;
799 
800  nut->avf = s;
801 
802  /* main header */
803  pos = 0;
804  do {
805  pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
806  if (pos < 0 + 1) {
807  av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
808  goto fail;
809  }
810  } while (decode_main_header(nut) < 0);
811 
812  /* stream headers */
813  pos = 0;
814  for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
816  if (pos < 0 + 1) {
817  av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
818  goto fail;
819  }
820  if (decode_stream_header(nut) >= 0)
821  initialized_stream_count++;
822  }
823 
824  /* info headers */
825  pos = 0;
826  for (;;) {
827  uint64_t startcode = find_any_startcode(bc, pos);
828  pos = avio_tell(bc);
829 
830  if (startcode == 0) {
831  av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
832  goto fail;
833  } else if (startcode == SYNCPOINT_STARTCODE) {
834  nut->next_startcode = startcode;
835  break;
836  } else if (startcode != INFO_STARTCODE) {
837  continue;
838  }
839 
840  decode_info_header(nut);
841  }
842 
843  s->internal->data_offset = pos - 8;
844 
845  if (bc->seekable & AVIO_SEEKABLE_NORMAL) {
846  int64_t orig_pos = avio_tell(bc);
848  avio_seek(bc, orig_pos, SEEK_SET);
849  }
851 
853 
854  return 0;
855 
856 fail:
857  nut_read_close(s);
858 
859  return AVERROR_INVALIDDATA;
860 }
861 
862 static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
863 {
864  int count = ffio_read_varlen(bc);
865  int skip_start = 0;
866  int skip_end = 0;
867  int channels = 0;
868  int64_t channel_layout = 0;
869  int sample_rate = 0;
870  int width = 0;
871  int height = 0;
872  int i, ret;
873 
874  for (i=0; i<count; i++) {
875  uint8_t name[256], str_value[256], type_str[256];
876  int value;
877  if (avio_tell(bc) >= maxpos)
878  return AVERROR_INVALIDDATA;
879  ret = get_str(bc, name, sizeof(name));
880  if (ret < 0) {
881  av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
882  return ret;
883  }
884  value = get_s(bc);
885 
886  if (value == -1) {
887  ret = get_str(bc, str_value, sizeof(str_value));
888  if (ret < 0) {
889  av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
890  return ret;
891  }
892  av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
893  } else if (value == -2) {
894  uint8_t *dst = NULL;
895  int64_t v64, value_len;
896 
897  ret = get_str(bc, type_str, sizeof(type_str));
898  if (ret < 0) {
899  av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
900  return ret;
901  }
902  value_len = ffio_read_varlen(bc);
903  if (value_len < 0 || value_len >= maxpos - avio_tell(bc))
904  return AVERROR_INVALIDDATA;
905  if (!strcmp(name, "Palette")) {
907  } else if (!strcmp(name, "Extradata")) {
909  } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
911  if(!dst)
912  return AVERROR(ENOMEM);
913  AV_WB64(dst, v64);
914  dst += 8;
915  } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
916  channel_layout = avio_rl64(bc);
917  continue;
918  } else {
919  av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
920  avio_skip(bc, value_len);
921  continue;
922  }
923  if(!dst)
924  return AVERROR(ENOMEM);
925  avio_read(bc, dst, value_len);
926  } else if (value == -3) {
927  value = get_s(bc);
928  } else if (value == -4) {
929  value = ffio_read_varlen(bc);
930  } else if (value < -4) {
931  get_s(bc);
932  } else {
933  if (!strcmp(name, "SkipStart")) {
934  skip_start = value;
935  } else if (!strcmp(name, "SkipEnd")) {
936  skip_end = value;
937  } else if (!strcmp(name, "Channels")) {
938  channels = value;
939  } else if (!strcmp(name, "SampleRate")) {
940  sample_rate = value;
941  } else if (!strcmp(name, "Width")) {
942  width = value;
943  } else if (!strcmp(name, "Height")) {
944  height = value;
945  } else {
946  av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
947  }
948  }
949  }
950 
951  if (channels || channel_layout || sample_rate || width || height) {
953  if (!dst)
954  return AVERROR(ENOMEM);
955  bytestream_put_le32(&dst,
957  AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) +
960  );
961  if (channels)
962  bytestream_put_le32(&dst, channels);
963  if (channel_layout)
964  bytestream_put_le64(&dst, channel_layout);
965  if (sample_rate)
966  bytestream_put_le32(&dst, sample_rate);
967  if (width || height){
968  bytestream_put_le32(&dst, width);
969  bytestream_put_le32(&dst, height);
970  }
971  }
972 
973  if (skip_start || skip_end) {
975  if (!dst)
976  return AVERROR(ENOMEM);
977  AV_WL32(dst, skip_start);
978  AV_WL32(dst+4, skip_end);
979  }
980 
981  if (avio_tell(bc) >= maxpos)
982  return AVERROR_INVALIDDATA;
983 
984  return 0;
985 }
986 
987 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
988  uint8_t *header_idx, int frame_code)
989 {
990  AVFormatContext *s = nut->avf;
991  AVIOContext *bc = s->pb;
992  StreamContext *stc;
993  int size, flags, size_mul, pts_delta, i, reserved_count, ret;
994  uint64_t tmp;
995 
996  if (!(nut->flags & NUT_PIPE) &&
997  avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
999  "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
1000  avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
1001  return AVERROR_INVALIDDATA;
1002  }
1003 
1004  flags = nut->frame_code[frame_code].flags;
1005  size_mul = nut->frame_code[frame_code].size_mul;
1006  size = nut->frame_code[frame_code].size_lsb;
1007  *stream_id = nut->frame_code[frame_code].stream_id;
1008  pts_delta = nut->frame_code[frame_code].pts_delta;
1009  reserved_count = nut->frame_code[frame_code].reserved_count;
1010  *header_idx = nut->frame_code[frame_code].header_idx;
1011 
1012  if (flags & FLAG_INVALID)
1013  return AVERROR_INVALIDDATA;
1014  if (flags & FLAG_CODED)
1015  flags ^= ffio_read_varlen(bc);
1016  if (flags & FLAG_STREAM_ID) {
1017  GET_V(*stream_id, tmp < s->nb_streams);
1018  }
1019  stc = &nut->stream[*stream_id];
1020  if (flags & FLAG_CODED_PTS) {
1021  int64_t coded_pts = ffio_read_varlen(bc);
1022  // FIXME check last_pts validity?
1023  if (coded_pts < (1LL << stc->msb_pts_shift)) {
1024  *pts = ff_lsb2full(stc, coded_pts);
1025  } else
1026  *pts = coded_pts - (1LL << stc->msb_pts_shift);
1027  } else
1028  *pts = stc->last_pts + pts_delta;
1029  if (flags & FLAG_SIZE_MSB)
1030  size += size_mul * ffio_read_varlen(bc);
1031  if (flags & FLAG_MATCH_TIME)
1032  get_s(bc);
1033  if (flags & FLAG_HEADER_IDX)
1034  *header_idx = ffio_read_varlen(bc);
1035  if (flags & FLAG_RESERVED)
1036  reserved_count = ffio_read_varlen(bc);
1037  for (i = 0; i < reserved_count; i++) {
1038  if (bc->eof_reached) {
1039  av_log(s, AV_LOG_ERROR, "reached EOF while decoding frame header\n");
1040  return AVERROR_INVALIDDATA;
1041  }
1042  ffio_read_varlen(bc);
1043  }
1044 
1045  if (*header_idx >= (unsigned)nut->header_count) {
1046  av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
1047  return AVERROR_INVALIDDATA;
1048  }
1049  if (size > 4096)
1050  *header_idx = 0;
1051  size -= nut->header_len[*header_idx];
1052 
1053  if (flags & FLAG_CHECKSUM) {
1054  avio_rb32(bc); // FIXME check this
1055  } else if (!(nut->flags & NUT_PIPE) &&
1056  size > 2 * nut->max_distance ||
1057  FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
1058  av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
1059  return AVERROR_INVALIDDATA;
1060  }
1061 
1062  stc->last_pts = *pts;
1063  stc->last_flags = flags;
1064 
1065  return size;
1066 fail:
1067  return ret;
1068 }
1069 
1070 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
1071 {
1072  AVFormatContext *s = nut->avf;
1073  AVIOContext *bc = s->pb;
1074  int size, stream_id, discard, ret;
1075  int64_t pts, last_IP_pts;
1076  StreamContext *stc;
1077  uint8_t header_idx;
1078 
1079  size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1080  if (size < 0)
1081  return size;
1082 
1083  stc = &nut->stream[stream_id];
1084 
1085  if (stc->last_flags & FLAG_KEY)
1086  stc->skip_until_key_frame = 0;
1087 
1088  discard = s->streams[stream_id]->discard;
1089  last_IP_pts = s->streams[stream_id]->last_IP_pts;
1090  if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1091  (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1092  last_IP_pts > pts) ||
1093  discard >= AVDISCARD_ALL ||
1094  stc->skip_until_key_frame) {
1095  avio_skip(bc, size);
1096  return 1;
1097  }
1098 
1099  ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1100  if (ret < 0)
1101  return ret;
1102  if (nut->header[header_idx])
1103  memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1104  pkt->pos = avio_tell(bc); // FIXME
1105  if (stc->last_flags & FLAG_SM_DATA) {
1106  int sm_size;
1107  if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) {
1108  ret = AVERROR_INVALIDDATA;
1109  goto fail;
1110  }
1111  if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) {
1112  ret = AVERROR_INVALIDDATA;
1113  goto fail;
1114  }
1115  sm_size = avio_tell(bc) - pkt->pos;
1116  size -= sm_size;
1117  pkt->size -= sm_size;
1118  }
1119 
1120  ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1121  if (ret != size) {
1122  if (ret < 0)
1123  goto fail;
1124  }
1125  av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1126 
1127  pkt->stream_index = stream_id;
1128  if (stc->last_flags & FLAG_KEY)
1130  pkt->pts = pts;
1131 
1132  return 0;
1133 fail:
1135  return ret;
1136 }
1137 
1139 {
1140  NUTContext *nut = s->priv_data;
1141  AVIOContext *bc = s->pb;
1142  int i, frame_code = 0, ret, skip;
1143  int64_t ts, back_ptr;
1144 
1145  for (;;) {
1146  int64_t pos = avio_tell(bc);
1147  uint64_t tmp = nut->next_startcode;
1148  nut->next_startcode = 0;
1149 
1150  if (tmp) {
1151  pos -= 8;
1152  } else {
1153  frame_code = avio_r8(bc);
1154  if (avio_feof(bc))
1155  return AVERROR_EOF;
1156  if (frame_code == 'N') {
1157  tmp = frame_code;
1158  for (i = 1; i < 8; i++)
1159  tmp = (tmp << 8) + avio_r8(bc);
1160  }
1161  }
1162  switch (tmp) {
1163  case MAIN_STARTCODE:
1164  case STREAM_STARTCODE:
1165  case INDEX_STARTCODE:
1166  skip = get_packetheader(nut, bc, 0, tmp);
1167  avio_skip(bc, skip);
1168  break;
1169  case INFO_STARTCODE:
1170  if (decode_info_header(nut) < 0)
1171  goto resync;
1172  break;
1173  case SYNCPOINT_STARTCODE:
1174  if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1175  goto resync;
1176  frame_code = avio_r8(bc);
1177  case 0:
1178  ret = decode_frame(nut, pkt, frame_code);
1179  if (ret == 0)
1180  return 0;
1181  else if (ret == 1) // OK but discard packet
1182  break;
1183  default:
1184 resync:
1185  av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1187  nut->last_resync_pos = avio_tell(bc);
1188  if (tmp == 0)
1189  return AVERROR_INVALIDDATA;
1190  av_log(s, AV_LOG_DEBUG, "sync\n");
1191  nut->next_startcode = tmp;
1192  }
1193  }
1194 }
1195 
1196 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1197  int64_t *pos_arg, int64_t pos_limit)
1198 {
1199  NUTContext *nut = s->priv_data;
1200  AVIOContext *bc = s->pb;
1201  int64_t pos, pts, back_ptr;
1202  av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1203  stream_index, *pos_arg, pos_limit);
1204 
1205  pos = *pos_arg;
1206  do {
1208  if (pos < 1) {
1209  av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1210  return AV_NOPTS_VALUE;
1211  }
1212  } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1213  *pos_arg = pos - 1;
1214  av_assert0(nut->last_syncpoint_pos == *pos_arg);
1215 
1216  av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1217  if (stream_index == -2)
1218  return back_ptr;
1219  av_assert0(stream_index == -1);
1220  return pts;
1221 }
1222 
1223 static int read_seek(AVFormatContext *s, int stream_index,
1224  int64_t pts, int flags)
1225 {
1226  NUTContext *nut = s->priv_data;
1227  AVStream *st = s->streams[stream_index];
1228  Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1229  Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1230  Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1231  int64_t pos, pos2, ts;
1232  int i;
1233 
1234  if (nut->flags & NUT_PIPE) {
1235  return AVERROR(ENOSYS);
1236  }
1237 
1238  if (st->index_entries) {
1240  if (index < 0)
1242  if (index < 0)
1243  return -1;
1244 
1245  pos2 = st->index_entries[index].pos;
1246  ts = st->index_entries[index].timestamp;
1247  } else {
1249  (void **) next_node);
1250  av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1251  next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1252  next_node[1]->ts);
1253  pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1254  next_node[1]->pos, next_node[1]->pos,
1255  next_node[0]->ts, next_node[1]->ts,
1257  if (pos < 0)
1258  return pos;
1259 
1260  if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1261  dummy.pos = pos + 16;
1262  next_node[1] = &nopts_sp;
1264  (void **) next_node);
1265  pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1266  next_node[1]->pos, next_node[1]->pos,
1267  next_node[0]->back_ptr, next_node[1]->back_ptr,
1268  flags, &ts, nut_read_timestamp);
1269  if (pos2 >= 0)
1270  pos = pos2;
1271  // FIXME dir but I think it does not matter
1272  }
1273  dummy.pos = pos;
1275  NULL);
1276 
1277  av_assert0(sp);
1278  pos2 = sp->back_ptr - 15;
1279  }
1280  av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1281  pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1282  avio_seek(s->pb, pos, SEEK_SET);
1283  nut->last_syncpoint_pos = pos;
1284  av_log(s, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1285  if (pos2 > pos || pos2 + 15 < pos)
1286  av_log(s, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1287  for (i = 0; i < s->nb_streams; i++)
1288  nut->stream[i].skip_until_key_frame = 1;
1289 
1290  nut->last_resync_pos = 0;
1291 
1292  return 0;
1293 }
1294 
1296  .name = "nut",
1297  .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1298  .flags = AVFMT_SEEK_TO_PTS,
1299  .priv_data_size = sizeof(NUTContext),
1300  .read_probe = nut_probe,
1304  .read_seek = read_seek,
1305  .extensions = "nut",
1306  .codec_tag = ff_nut_codec_tags,
1307 };
channels
Definition: aptx.h:33
#define A(x)
Definition: vp56_arith.h:28
uint8_t
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define AVFMT_EVENT_FLAG_METADATA_UPDATED
Definition: avformat.h:1562
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
@ AVFMT_DURATION_FROM_PTS
Duration accurately estimated from PTSes.
Definition: avformat.h:1211
#define AVSTREAM_EVENT_FLAG_METADATA_UPDATED
Definition: avformat.h:999
#define AVFMT_SEEK_TO_PTS
Seeking is based on PTS.
Definition: avformat.h:484
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2415
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:902
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:342
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:781
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:758
void ffio_init_checksum(AVIOContext *s, unsigned long(*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum)
Definition: aviobuf.c:612
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:604
uint64_t ffio_read_varlen(AVIOContext *bc)
Definition: aviobuf.c:910
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:586
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, buffer_size_t size)
Definition: avpacket.c:343
#define AV_RB32
Definition: intreadwrite.h:130
byte swapping routines
#define av_be2ne64(x)
Definition: bswap.h:94
#define flag(name)
Definition: cbs_av1.c:553
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
static struct @321 state
#define fail()
Definition: checkasm.h:133
#define FFMIN(a, b)
Definition: common.h:105
#define FFMAX(a, b)
Definition: common.h:103
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define NULL
Definition: coverity.c:32
Public dictionary API.
double value
Definition: eval.c:98
sample_rate
static int nb_streams
Definition: ffprobe.c:283
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
static int64_t last_pts
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
@ AVDISCARD_ALL
discard all
Definition: avcodec.h:236
@ AVDISCARD_NONKEY
discard all frames except keyframes
Definition: avcodec.h:235
@ AVDISCARD_BIDIR
discard all bidirectional frames
Definition: avcodec.h:233
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:114
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
@ AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT
Definition: packet.h:432
@ AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT
Definition: packet.h:433
@ AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE
Definition: packet.h:434
@ AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS
Definition: packet.h:435
@ AV_PKT_DATA_SKIP_SAMPLES
Recommmends skipping the specified number of samples.
Definition: packet.h:156
@ AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL
Data found in BlockAdditional element of matroska container.
Definition: packet.h:191
@ AV_PKT_DATA_PALETTE
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette.
Definition: packet.h:46
@ AV_PKT_DATA_NEW_EXTRADATA
The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was...
Definition: packet.h:55
@ AV_PKT_DATA_PARAM_CHANGE
An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
Definition: packet.h:72
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
enum AVCodecID av_codec_get_id(const struct AVCodecTag *const *tags, unsigned int tag)
Get the AVCodecID for the given codec tag tag.
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:2011
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2128
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
int64_t av_gcd(int64_t a, int64_t b)
Compute the greatest common divisor of two integer operands.
Definition: mathematics.c:37
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:245
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
@ AVMEDIA_TYPE_DATA
Opaque data information usually continuous.
Definition: avutil.h:203
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:215
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
int index
Definition: gxfenc.c:89
#define B
Definition: huffyuvdsp.h:32
cl_device_type type
int i
Definition: input.c:407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
#define AV_WB64(p, v)
Definition: intreadwrite.h:433
const AVCodecTag ff_codec_movvideo_tags[]
Definition: isom_tags.c:29
static int resync(AVFormatContext *s)
Definition: flvdec.c:970
int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
Definition: utils.c:2211
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4941
AVChapter * avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: utils.c:4635
int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
Perform a binary search using read_timestamp().
Definition: utils.c:2249
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:3330
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3129
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:59
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
int dummy
Definition: motion.c:64
const AVCodecTag ff_nut_audio_tags[]
Definition: nut.c:221
const AVCodecTag ff_nut_video_tags[]
Definition: nut.c:43
void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val)
Definition: nut.c:255
int ff_nut_sp_pos_cmp(const void *a, const void *b)
Definition: nut.c:273
int64_t ff_lsb2full(StreamContext *stream, int64_t lsb)
Definition: nut.c:266
int ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts)
Definition: nut.c:285
int ff_nut_sp_pts_cmp(const void *a, const void *b)
Definition: nut.c:279
const AVCodecTag ff_nut_data_tags[]
Definition: nut.c:38
const AVCodecTag *const ff_nut_codec_tags[]
Definition: nut.c:250
void ff_nut_free_sp(NUTContext *nut)
Definition: nut.c:316
const AVCodecTag ff_nut_audio_extra_tags[]
Definition: nut.c:211
const Dispositions ff_nut_dispositions[]
Definition: nut.c:324
const AVCodecTag ff_nut_subtitle_tags[]
Definition: nut.c:28
const AVMetadataConv ff_nut_metadata_conv[]
Definition: nut.c:334
#define SYNCPOINT_STARTCODE
Definition: nut.h:31
@ FLAG_CHECKSUM
Definition: nut.h:49
@ FLAG_HEADER_IDX
Definition: nut.h:52
@ FLAG_KEY
Definition: nut.h:44
@ FLAG_SM_DATA
Definition: nut.h:51
@ FLAG_MATCH_TIME
Definition: nut.h:53
@ FLAG_CODED_PTS
Definition: nut.h:46
@ FLAG_SIZE_MSB
Definition: nut.h:48
@ FLAG_INVALID
Definition: nut.h:55
@ FLAG_CODED
Definition: nut.h:54
@ FLAG_RESERVED
Definition: nut.h:50
@ FLAG_STREAM_ID
Definition: nut.h:47
#define NUT_MIN_VERSION
Definition: nut.h:41
#define NUT_BROADCAST
Definition: nut.h:113
#define STREAM_STARTCODE
Definition: nut.h:30
#define NUT_MAX_VERSION
Definition: nut.h:39
#define MAIN_STARTCODE
Definition: nut.h:29
#define NUT_PIPE
Definition: nut.h:114
#define INDEX_STARTCODE
Definition: nut.h:32
#define INFO_STARTCODE
Definition: nut.h:33
static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nutdec.c:1138
static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
Definition: nutdec.c:109
static uint64_t get_fourcc(AVIOContext *bc)
Definition: nutdec.c:75
#define NUT_MAX_STREAMS
Definition: nutdec.c:36
static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
Definition: nutdec.c:41
static int decode_main_header(NUTContext *nut)
Definition: nutdec.c:192
static void set_disposition_bits(AVFormatContext *avf, char *value, int stream_id)
Definition: nutdec.c:471
static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit)
Definition: nutdec.c:1196
static int decode_info_header(NUTContext *nut)
Definition: nutdec.c:486
static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
Definition: nutdec.c:609
AVInputFormat ff_nut_demuxer
Definition: nutdec.c:1295
static int64_t find_duration(NUTContext *nut, int64_t filesize)
Definition: nutdec.c:653
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
Definition: nutdec.c:1070
static int get_packetheader(NUTContext *nut, AVIOContext *bc, int calculate_checksum, uint64_t startcode)
Definition: nutdec.c:89
static int nut_probe(const AVProbeData *p)
Definition: nutdec.c:152
static int skip_reserved(AVIOContext *bc, int64_t pos)
Definition: nutdec.c:176
static int find_and_decode_index(NUTContext *nut)
Definition: nutdec.c:665
static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
Definition: nutdec.c:862
static int64_t get_s(AVIOContext *bc)
Definition: nutdec.c:65
static int nut_read_close(AVFormatContext *s)
Definition: nutdec.c:779
static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
Definition: nutdec.c:1223
#define GET_V(dst, check)
Definition: nutdec.c:165
static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
Find the given startcode.
Definition: nutdec.c:140
static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, uint8_t *header_idx, int frame_code)
Definition: nutdec.c:987
static int decode_stream_header(NUTContext *nut)
Definition: nutdec.c:362
static int nut_read_header(AVFormatContext *s)
Definition: nutdec.c:793
const char * name
Definition: qsvenc.c:46
#define sp
Definition: regdef.h:63
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:33
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:508
internal header for RIFF based (de)muxers do NOT include this in end user applications
const uint8_t * code
Definition: spdifenc.c:413
unsigned int pos
Definition: spdifenc.c:412
AVDictionary * metadata
Definition: avformat.h:1193
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
int channels
Audio only.
Definition: codec_par.h:166
int width
Video only.
Definition: codec_par.h:126
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int video_delay
Video only.
Definition: codec_par.h:155
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1288
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1300
Bytestream IO Context.
Definition: avio.h:161
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:239
int64_t pos
Definition: avformat.h:804
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:805
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int size
Definition: packet.h:370
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
uint8_t * data
Definition: packet.h:369
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:935
AVDictionary * metadata
Definition: avformat.h:937
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:902
int event_flags
Flags indicating events happening on the stream, a combination of AVSTREAM_EVENT_FLAG_*.
Definition: avformat.h:992
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1090
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1015
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:926
int flag
Definition: nut.h:130
uint8_t header_idx
Definition: nut.h:72
uint16_t flags
Definition: nut.h:66
int16_t pts_delta
Definition: nut.h:70
uint16_t size_mul
Definition: nut.h:68
uint8_t stream_id
Definition: nut.h:67
uint16_t size_lsb
Definition: nut.h:69
uint8_t reserved_count
Definition: nut.h:71
Definition: nut.h:91
const uint8_t * header[128]
Definition: nut.h:98
int flags
Definition: nut.h:115
AVRational * time_base
Definition: nut.h:107
StreamContext * stream
Definition: nut.h:100
int header_count
Definition: nut.h:106
AVFormatContext * avf
Definition: nut.h:93
struct AVTreeNode * syncpoints
Definition: nut.h:108
int minor_version
Definition: nut.h:117
uint64_t next_startcode
Definition: nut.h:99
int version
Definition: nut.h:116
FrameCode frame_code[256]
Definition: nut.h:96
int64_t last_resync_pos
Definition: nut.h:105
unsigned int max_distance
Definition: nut.h:102
uint8_t header_len[128]
Definition: nut.h:97
int64_t last_syncpoint_pos
Definition: nut.h:104
unsigned int time_base_count
Definition: nut.h:103
int time_base_id
Definition: nut.h:79
AVRational time_base
Definition: signature.h:103
int max_pts_distance
Definition: nut.h:82
int skip_until_key_frame
Definition: nut.h:77
int decode_delay
Definition: nut.h:83
int msb_pts_shift
Definition: nut.h:81
int last_flags
Definition: nut.h:76
int64_t last_pts
Definition: nut.h:78
Definition: nut.h:58
int64_t ts
Definition: nut.h:62
#define av_free(p)
#define av_malloc_array(a, b)
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
static uint8_t tmp[11]
Definition: aes_ctr.c:27
int64_t duration
Definition: movenc.c:64
AVPacket * pkt
Definition: movenc.c:59
#define height
#define width
static int64_t pts
void * av_tree_find(const AVTreeNode *t, void *key, int(*cmp)(const void *key, const void *b), void *next[2])
Definition: tree.c:39
A tree container.
int size
int len