FFmpeg
utils.c
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1 /*
2  * various utility functions for use within FFmpeg
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdarg.h>
23 #include <stdint.h>
24 
25 #include "config.h"
26 
27 #include "libavutil/avassert.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/mathematics.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/parseutils.h"
34 #include "libavutil/pixdesc.h"
35 #include "libavutil/thread.h"
36 #include "libavutil/time.h"
38 #include "libavutil/timestamp.h"
39 
40 #include "libavcodec/bytestream.h"
41 #include "libavcodec/internal.h"
42 #include "libavcodec/raw.h"
43 
44 #include "audiointerleave.h"
45 #include "avformat.h"
46 #include "avio_internal.h"
47 #include "id3v2.h"
48 #include "internal.h"
49 #include "metadata.h"
50 #if CONFIG_NETWORK
51 #include "network.h"
52 #endif
53 #include "riff.h"
54 #include "url.h"
55 
56 #include "libavutil/ffversion.h"
57 const char av_format_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
58 
60 
61 /**
62  * @file
63  * various utility functions for use within FFmpeg
64  */
65 
66 unsigned avformat_version(void)
67 {
70 }
71 
72 const char *avformat_configuration(void)
73 {
74  return FFMPEG_CONFIGURATION;
75 }
76 
77 const char *avformat_license(void)
78 {
79 #define LICENSE_PREFIX "libavformat license: "
80  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
81 }
82 
84 {
85  return ff_mutex_lock(&avformat_mutex) ? -1 : 0;
86 }
87 
89 {
90  return ff_mutex_unlock(&avformat_mutex) ? -1 : 0;
91 }
92 
93 #define RELATIVE_TS_BASE (INT64_MAX - (1LL<<48))
94 
95 static int is_relative(int64_t ts) {
96  return ts > (RELATIVE_TS_BASE - (1LL<<48));
97 }
98 
99 /**
100  * Wrap a given time stamp, if there is an indication for an overflow
101  *
102  * @param st stream
103  * @param timestamp the time stamp to wrap
104  * @return resulting time stamp
105  */
106 static int64_t wrap_timestamp(const AVStream *st, int64_t timestamp)
107 {
109  st->pts_wrap_reference != AV_NOPTS_VALUE && timestamp != AV_NOPTS_VALUE) {
111  timestamp < st->pts_wrap_reference)
112  return timestamp + (1ULL << st->pts_wrap_bits);
113  else if (st->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET &&
114  timestamp >= st->pts_wrap_reference)
115  return timestamp - (1ULL << st->pts_wrap_bits);
116  }
117  return timestamp;
118 }
119 
120 #if FF_API_FORMAT_GET_SET
121 MAKE_ACCESSORS(AVStream, stream, AVRational, r_frame_rate)
122 #if FF_API_LAVF_FFSERVER
124 MAKE_ACCESSORS(AVStream, stream, char *, recommended_encoder_configuration)
126 #endif
129 MAKE_ACCESSORS(AVFormatContext, format, AVCodec *, subtitle_codec)
131 MAKE_ACCESSORS(AVFormatContext, format, int, metadata_header_padding)
132 MAKE_ACCESSORS(AVFormatContext, format, void *, opaque)
134 #if FF_API_OLD_OPEN_CALLBACKS
138 #endif
139 #endif
140 
141 int64_t av_stream_get_end_pts(const AVStream *st)
142 {
143  if (st->internal->priv_pts) {
144  return st->internal->priv_pts->val;
145  } else
146  return AV_NOPTS_VALUE;
147 }
148 
150 {
151  return st->parser;
152 }
153 
155 {
156  int i;
158  for (i = 0; i < s->nb_streams; i++) {
159  AVStream *st = s->streams[i];
160  st->inject_global_side_data = 1;
161  }
162 }
163 
165 {
166  av_assert0(!dst->codec_whitelist &&
167  !dst->format_whitelist &&
168  !dst->protocol_whitelist &&
169  !dst->protocol_blacklist);
170  dst-> codec_whitelist = av_strdup(src->codec_whitelist);
174  if ( (src-> codec_whitelist && !dst-> codec_whitelist)
175  || (src-> format_whitelist && !dst-> format_whitelist)
176  || (src->protocol_whitelist && !dst->protocol_whitelist)
177  || (src->protocol_blacklist && !dst->protocol_blacklist)) {
178  av_log(dst, AV_LOG_ERROR, "Failed to duplicate black/whitelist\n");
179  return AVERROR(ENOMEM);
180  }
181  return 0;
182 }
183 
185 {
186 #if FF_API_LAVF_AVCTX
188  if (st->codec->codec)
189  return st->codec->codec;
191 #endif
192 
193  switch (st->codecpar->codec_type) {
194  case AVMEDIA_TYPE_VIDEO:
195  if (s->video_codec) return s->video_codec;
196  break;
197  case AVMEDIA_TYPE_AUDIO:
198  if (s->audio_codec) return s->audio_codec;
199  break;
201  if (s->subtitle_codec) return s->subtitle_codec;
202  break;
203  }
204 
205  return avcodec_find_decoder(codec_id);
206 }
207 
209 {
210  const AVCodec *codec;
211 
212 #if CONFIG_H264_DECODER
213  /* Other parts of the code assume this decoder to be used for h264,
214  * so force it if possible. */
215  if (codec_id == AV_CODEC_ID_H264)
216  return avcodec_find_decoder_by_name("h264");
217 #endif
218 
219  codec = find_decoder(s, st, codec_id);
220  if (!codec)
221  return NULL;
222 
224  const AVCodec *probe_codec = NULL;
225  while (probe_codec = av_codec_next(probe_codec)) {
226  if (probe_codec->id == codec_id &&
227  av_codec_is_decoder(probe_codec) &&
229  return probe_codec;
230  }
231  }
232  }
233 
234  return codec;
235 }
236 
237 #if FF_API_FORMAT_GET_SET
238 int av_format_get_probe_score(const AVFormatContext *s)
239 {
240  return s->probe_score;
241 }
242 #endif
243 
244 /* an arbitrarily chosen "sane" max packet size -- 50M */
245 #define SANE_CHUNK_SIZE (50000000)
246 
248 {
249  if (s->maxsize>= 0) {
250  int64_t remaining= s->maxsize - avio_tell(s);
251  if (remaining < size) {
252  int64_t newsize = avio_size(s);
253  if (!s->maxsize || s->maxsize<newsize)
254  s->maxsize = newsize - !newsize;
255  remaining= s->maxsize - avio_tell(s);
256  remaining= FFMAX(remaining, 0);
257  }
258 
259  if (s->maxsize>= 0 && remaining+1 < size) {
260  av_log(NULL, remaining ? AV_LOG_ERROR : AV_LOG_DEBUG, "Truncating packet of size %d to %"PRId64"\n", size, remaining+1);
261  size = remaining+1;
262  }
263  }
264  return size;
265 }
266 
267 /* Read the data in sane-sized chunks and append to pkt.
268  * Return the number of bytes read or an error. */
270 {
271  int64_t orig_pos = pkt->pos; // av_grow_packet might reset pos
272  int orig_size = pkt->size;
273  int ret;
274 
275  do {
276  int prev_size = pkt->size;
277  int read_size;
278 
279  /* When the caller requests a lot of data, limit it to the amount
280  * left in file or SANE_CHUNK_SIZE when it is not known. */
281  read_size = size;
282  if (read_size > SANE_CHUNK_SIZE/10) {
283  read_size = ffio_limit(s, read_size);
284  // If filesize/maxsize is unknown, limit to SANE_CHUNK_SIZE
285  if (s->maxsize < 0)
286  read_size = FFMIN(read_size, SANE_CHUNK_SIZE);
287  }
288 
289  ret = av_grow_packet(pkt, read_size);
290  if (ret < 0)
291  break;
292 
293  ret = avio_read(s, pkt->data + prev_size, read_size);
294  if (ret != read_size) {
295  av_shrink_packet(pkt, prev_size + FFMAX(ret, 0));
296  break;
297  }
298 
299  size -= read_size;
300  } while (size > 0);
301  if (size > 0)
302  pkt->flags |= AV_PKT_FLAG_CORRUPT;
303 
304  pkt->pos = orig_pos;
305  if (!pkt->size)
306  av_packet_unref(pkt);
307  return pkt->size > orig_size ? pkt->size - orig_size : ret;
308 }
309 
311 {
312  av_init_packet(pkt);
313  pkt->data = NULL;
314  pkt->size = 0;
315  pkt->pos = avio_tell(s);
316 
317  return append_packet_chunked(s, pkt, size);
318 }
319 
321 {
322  if (!pkt->size)
323  return av_get_packet(s, pkt, size);
324  return append_packet_chunked(s, pkt, size);
325 }
326 
327 int av_filename_number_test(const char *filename)
328 {
329  char buf[1024];
330  return filename &&
331  (av_get_frame_filename(buf, sizeof(buf), filename, 1) >= 0);
332 }
333 
335  AVProbeData *pd)
336 {
337  static const struct {
338  const char *name;
339  enum AVCodecID id;
340  enum AVMediaType type;
341  } fmt_id_type[] = {
343  { "ac3", AV_CODEC_ID_AC3, AVMEDIA_TYPE_AUDIO },
344  { "aptx", AV_CODEC_ID_APTX, AVMEDIA_TYPE_AUDIO },
345  { "dts", AV_CODEC_ID_DTS, AVMEDIA_TYPE_AUDIO },
347  { "dvbtxt", AV_CODEC_ID_DVB_TELETEXT,AVMEDIA_TYPE_SUBTITLE },
348  { "eac3", AV_CODEC_ID_EAC3, AVMEDIA_TYPE_AUDIO },
350  { "hevc", AV_CODEC_ID_HEVC, AVMEDIA_TYPE_VIDEO },
351  { "loas", AV_CODEC_ID_AAC_LATM, AVMEDIA_TYPE_AUDIO },
352  { "m4v", AV_CODEC_ID_MPEG4, AVMEDIA_TYPE_VIDEO },
353  { "mjpeg_2000",AV_CODEC_ID_JPEG2000, AVMEDIA_TYPE_VIDEO },
354  { "mp3", AV_CODEC_ID_MP3, AVMEDIA_TYPE_AUDIO },
355  { "mpegvideo", AV_CODEC_ID_MPEG2VIDEO, AVMEDIA_TYPE_VIDEO },
356  { "truehd", AV_CODEC_ID_TRUEHD, AVMEDIA_TYPE_AUDIO },
357  { 0 }
358  };
359  int score;
360  const AVInputFormat *fmt = av_probe_input_format3(pd, 1, &score);
361 
362  if (fmt) {
363  int i;
364  av_log(s, AV_LOG_DEBUG,
365  "Probe with size=%d, packets=%d detected %s with score=%d\n",
367  fmt->name, score);
368  for (i = 0; fmt_id_type[i].name; i++) {
369  if (!strcmp(fmt->name, fmt_id_type[i].name)) {
370  if (fmt_id_type[i].type != AVMEDIA_TYPE_AUDIO &&
371  st->codecpar->sample_rate)
372  continue;
373  if (st->request_probe > score &&
374  st->codecpar->codec_id != fmt_id_type[i].id)
375  continue;
376  st->codecpar->codec_id = fmt_id_type[i].id;
377  st->codecpar->codec_type = fmt_id_type[i].type;
378  st->internal->need_context_update = 1;
379 #if FF_API_LAVF_AVCTX
381  st->codec->codec_type = st->codecpar->codec_type;
382  st->codec->codec_id = st->codecpar->codec_id;
384 #endif
385  return score;
386  }
387  }
388  }
389  return 0;
390 }
391 
392 /************************************************************/
393 /* input media file */
394 
396  int err;
397 
398  if (ic->format_whitelist && av_match_list(ic->iformat->name, ic->format_whitelist, ',') <= 0) {
399  av_log(ic, AV_LOG_ERROR, "Format not on whitelist \'%s\'\n", ic->format_whitelist);
400  return AVERROR(EINVAL);
401  }
402 
403  if (ic->iformat->read_header) {
404  err = ic->iformat->read_header(ic);
405  if (err < 0)
406  return err;
407  }
408 
409  if (ic->pb && !ic->internal->data_offset)
410  ic->internal->data_offset = avio_tell(ic->pb);
411 
412  return 0;
413 }
414 
415 /* Open input file and probe the format if necessary. */
416 static int init_input(AVFormatContext *s, const char *filename,
418 {
419  int ret;
420  AVProbeData pd = { filename, NULL, 0 };
421  int score = AVPROBE_SCORE_RETRY;
422 
423  if (s->pb) {
425  if (!s->iformat)
426  return av_probe_input_buffer2(s->pb, &s->iformat, filename,
427  s, 0, s->format_probesize);
428  else if (s->iformat->flags & AVFMT_NOFILE)
429  av_log(s, AV_LOG_WARNING, "Custom AVIOContext makes no sense and "
430  "will be ignored with AVFMT_NOFILE format.\n");
431  return 0;
432  }
433 
434  if ((s->iformat && s->iformat->flags & AVFMT_NOFILE) ||
435  (!s->iformat && (s->iformat = av_probe_input_format2(&pd, 0, &score))))
436  return score;
437 
438  if ((ret = s->io_open(s, &s->pb, filename, AVIO_FLAG_READ | s->avio_flags, options)) < 0)
439  return ret;
440 
441  if (s->iformat)
442  return 0;
443  return av_probe_input_buffer2(s->pb, &s->iformat, filename,
444  s, 0, s->format_probesize);
445 }
446 
447 int ff_packet_list_put(AVPacketList **packet_buffer,
448  AVPacketList **plast_pktl,
449  AVPacket *pkt, int flags)
450 {
451  AVPacketList *pktl = av_mallocz(sizeof(AVPacketList));
452  int ret;
453 
454  if (!pktl)
455  return AVERROR(ENOMEM);
456 
457  if (flags & FF_PACKETLIST_FLAG_REF_PACKET) {
458  if ((ret = av_packet_ref(&pktl->pkt, pkt)) < 0) {
459  av_free(pktl);
460  return ret;
461  }
462  } else {
463  ret = av_packet_make_refcounted(pkt);
464  if (ret < 0) {
465  av_free(pktl);
466  return ret;
467  }
468  av_packet_move_ref(&pktl->pkt, pkt);
469  }
470 
471  if (*packet_buffer)
472  (*plast_pktl)->next = pktl;
473  else
474  *packet_buffer = pktl;
475 
476  /* Add the packet in the buffered packet list. */
477  *plast_pktl = pktl;
478  return 0;
479 }
480 
482 {
483  int i, ret;
484  for (i = 0; i < s->nb_streams; i++)
486  s->streams[i]->discard < AVDISCARD_ALL) {
487  if (s->streams[i]->attached_pic.size <= 0) {
489  "Attached picture on stream %d has invalid size, "
490  "ignoring\n", i);
491  continue;
492  }
493 
496  &s->streams[i]->attached_pic,
498  if (ret < 0)
499  return ret;
500  }
501  return 0;
502 }
503 
505 {
506  int i, ret;
507  for (i = 0; i < s->nb_streams; i++) {
508  AVStream *st = s->streams[i];
509 
510  if (!st->internal->need_context_update)
511  continue;
512 
513  /* close parser, because it depends on the codec */
514  if (st->parser && st->internal->avctx->codec_id != st->codecpar->codec_id) {
515  av_parser_close(st->parser);
516  st->parser = NULL;
517  }
518 
519  /* update internal codec context, for the parser */
521  if (ret < 0)
522  return ret;
523 
524 #if FF_API_LAVF_AVCTX
526  /* update deprecated public codec context */
527  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
528  if (ret < 0)
529  return ret;
531 #endif
532 
533  st->internal->need_context_update = 0;
534  }
535  return 0;
536 }
537 
538 
539 int avformat_open_input(AVFormatContext **ps, const char *filename,
541 {
542  AVFormatContext *s = *ps;
543  int i, ret = 0;
544  AVDictionary *tmp = NULL;
545  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
546 
547  if (!s && !(s = avformat_alloc_context()))
548  return AVERROR(ENOMEM);
549  if (!s->av_class) {
550  av_log(NULL, AV_LOG_ERROR, "Input context has not been properly allocated by avformat_alloc_context() and is not NULL either\n");
551  return AVERROR(EINVAL);
552  }
553  if (fmt)
554  s->iformat = fmt;
555 
556  if (options)
557  av_dict_copy(&tmp, *options, 0);
558 
559  if (s->pb) // must be before any goto fail
561 
562  if ((ret = av_opt_set_dict(s, &tmp)) < 0)
563  goto fail;
564 
565  if (!(s->url = av_strdup(filename ? filename : ""))) {
566  ret = AVERROR(ENOMEM);
567  goto fail;
568  }
569 
570 #if FF_API_FORMAT_FILENAME
572  av_strlcpy(s->filename, filename ? filename : "", sizeof(s->filename));
574 #endif
575  if ((ret = init_input(s, filename, &tmp)) < 0)
576  goto fail;
577  s->probe_score = ret;
578 
579  if (!s->protocol_whitelist && s->pb && s->pb->protocol_whitelist) {
581  if (!s->protocol_whitelist) {
582  ret = AVERROR(ENOMEM);
583  goto fail;
584  }
585  }
586 
587  if (!s->protocol_blacklist && s->pb && s->pb->protocol_blacklist) {
589  if (!s->protocol_blacklist) {
590  ret = AVERROR(ENOMEM);
591  goto fail;
592  }
593  }
594 
595  if (s->format_whitelist && av_match_list(s->iformat->name, s->format_whitelist, ',') <= 0) {
596  av_log(s, AV_LOG_ERROR, "Format not on whitelist \'%s\'\n", s->format_whitelist);
597  ret = AVERROR(EINVAL);
598  goto fail;
599  }
600 
602 
603  /* Check filename in case an image number is expected. */
604  if (s->iformat->flags & AVFMT_NEEDNUMBER) {
605  if (!av_filename_number_test(filename)) {
606  ret = AVERROR(EINVAL);
607  goto fail;
608  }
609  }
610 
612 
613  /* Allocate private data. */
614  if (s->iformat->priv_data_size > 0) {
615  if (!(s->priv_data = av_mallocz(s->iformat->priv_data_size))) {
616  ret = AVERROR(ENOMEM);
617  goto fail;
618  }
619  if (s->iformat->priv_class) {
620  *(const AVClass **) s->priv_data = s->iformat->priv_class;
622  if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
623  goto fail;
624  }
625  }
626 
627  /* e.g. AVFMT_NOFILE formats will not have a AVIOContext */
628  if (s->pb)
629  ff_id3v2_read_dict(s->pb, &s->internal->id3v2_meta, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
630 
631 
632  if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->iformat->read_header)
633  if ((ret = s->iformat->read_header(s)) < 0)
634  goto fail;
635 
636  if (!s->metadata) {
637  s->metadata = s->internal->id3v2_meta;
638  s->internal->id3v2_meta = NULL;
639  } else if (s->internal->id3v2_meta) {
640  int level = AV_LOG_WARNING;
642  level = AV_LOG_ERROR;
643  av_log(s, level, "Discarding ID3 tags because more suitable tags were found.\n");
646  return AVERROR_INVALIDDATA;
647  }
648 
649  if (id3v2_extra_meta) {
650  if (!strcmp(s->iformat->name, "mp3") || !strcmp(s->iformat->name, "aac") ||
651  !strcmp(s->iformat->name, "tta") || !strcmp(s->iformat->name, "wav")) {
652  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0)
653  goto fail;
654  if ((ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0)
655  goto fail;
656  if ((ret = ff_id3v2_parse_priv(s, &id3v2_extra_meta)) < 0)
657  goto fail;
658  } else
659  av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
660  }
661  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
662 
663  if ((ret = avformat_queue_attached_pictures(s)) < 0)
664  goto fail;
665 
666  if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->pb && !s->internal->data_offset)
667  s->internal->data_offset = avio_tell(s->pb);
668 
670 
672 
673  for (i = 0; i < s->nb_streams; i++)
675 
676  if (options) {
677  av_dict_free(options);
678  *options = tmp;
679  }
680  *ps = s;
681  return 0;
682 
683 fail:
684  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
685  av_dict_free(&tmp);
686  if (s->pb && !(s->flags & AVFMT_FLAG_CUSTOM_IO))
687  avio_closep(&s->pb);
689  *ps = NULL;
690  return ret;
691 }
692 
693 /*******************************************************/
694 
696 {
697  switch (st->codecpar->codec_type) {
698  case AVMEDIA_TYPE_VIDEO:
699  if (s->video_codec_id)
700  st->codecpar->codec_id = s->video_codec_id;
701  break;
702  case AVMEDIA_TYPE_AUDIO:
703  if (s->audio_codec_id)
704  st->codecpar->codec_id = s->audio_codec_id;
705  break;
707  if (s->subtitle_codec_id)
709  break;
710  case AVMEDIA_TYPE_DATA:
711  if (s->data_codec_id)
712  st->codecpar->codec_id = s->data_codec_id;
713  break;
714  }
715 }
716 
717 static int probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
718 {
719  if (st->request_probe>0) {
720  AVProbeData *pd = &st->probe_data;
721  int end;
722  av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
723  --st->probe_packets;
724 
725  if (pkt) {
726  uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
727  if (!new_buf) {
729  "Failed to reallocate probe buffer for stream %d\n",
730  st->index);
731  goto no_packet;
732  }
733  pd->buf = new_buf;
734  memcpy(pd->buf + pd->buf_size, pkt->data, pkt->size);
735  pd->buf_size += pkt->size;
736  memset(pd->buf + pd->buf_size, 0, AVPROBE_PADDING_SIZE);
737  } else {
738 no_packet:
739  st->probe_packets = 0;
740  if (!pd->buf_size) {
742  "nothing to probe for stream %d\n", st->index);
743  }
744  }
745 
747  || st->probe_packets<= 0;
748 
749  if (end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)) {
750  int score = set_codec_from_probe_data(s, st, pd);
752  || end) {
753  pd->buf_size = 0;
754  av_freep(&pd->buf);
755  st->request_probe = -1;
756  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
757  av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
758  } else
759  av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
760  }
761  force_codec_ids(s, st);
762  }
763  }
764  return 0;
765 }
766 
767 static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
768 {
769  int64_t ref = pkt->dts;
770  int i, pts_wrap_behavior;
771  int64_t pts_wrap_reference;
772  AVProgram *first_program;
773 
774  if (ref == AV_NOPTS_VALUE)
775  ref = pkt->pts;
776  if (st->pts_wrap_reference != AV_NOPTS_VALUE || st->pts_wrap_bits >= 63 || ref == AV_NOPTS_VALUE || !s->correct_ts_overflow)
777  return 0;
778  ref &= (1LL << st->pts_wrap_bits)-1;
779 
780  // reference time stamp should be 60 s before first time stamp
781  pts_wrap_reference = ref - av_rescale(60, st->time_base.den, st->time_base.num);
782  // if first time stamp is not more than 1/8 and 60s before the wrap point, subtract rather than add wrap offset
783  pts_wrap_behavior = (ref < (1LL << st->pts_wrap_bits) - (1LL << st->pts_wrap_bits-3)) ||
784  (ref < (1LL << st->pts_wrap_bits) - av_rescale(60, st->time_base.den, st->time_base.num)) ?
786 
787  first_program = av_find_program_from_stream(s, NULL, stream_index);
788 
789  if (!first_program) {
790  int default_stream_index = av_find_default_stream_index(s);
791  if (s->streams[default_stream_index]->pts_wrap_reference == AV_NOPTS_VALUE) {
792  for (i = 0; i < s->nb_streams; i++) {
794  continue;
795  s->streams[i]->pts_wrap_reference = pts_wrap_reference;
796  s->streams[i]->pts_wrap_behavior = pts_wrap_behavior;
797  }
798  }
799  else {
800  st->pts_wrap_reference = s->streams[default_stream_index]->pts_wrap_reference;
801  st->pts_wrap_behavior = s->streams[default_stream_index]->pts_wrap_behavior;
802  }
803  }
804  else {
805  AVProgram *program = first_program;
806  while (program) {
807  if (program->pts_wrap_reference != AV_NOPTS_VALUE) {
808  pts_wrap_reference = program->pts_wrap_reference;
809  pts_wrap_behavior = program->pts_wrap_behavior;
810  break;
811  }
812  program = av_find_program_from_stream(s, program, stream_index);
813  }
814 
815  // update every program with differing pts_wrap_reference
816  program = first_program;
817  while (program) {
818  if (program->pts_wrap_reference != pts_wrap_reference) {
819  for (i = 0; i<program->nb_stream_indexes; i++) {
820  s->streams[program->stream_index[i]]->pts_wrap_reference = pts_wrap_reference;
821  s->streams[program->stream_index[i]]->pts_wrap_behavior = pts_wrap_behavior;
822  }
823 
824  program->pts_wrap_reference = pts_wrap_reference;
825  program->pts_wrap_behavior = pts_wrap_behavior;
826  }
827  program = av_find_program_from_stream(s, program, stream_index);
828  }
829  }
830  return 1;
831 }
832 
834 {
835  int ret, i, err;
836  AVStream *st;
837 
838  pkt->data = NULL;
839  pkt->size = 0;
840  av_init_packet(pkt);
841 
842  for (;;) {
844  const AVPacket *pkt1;
845 
846  if (pktl) {
847  st = s->streams[pktl->pkt.stream_index];
849  if ((err = probe_codec(s, st, NULL)) < 0)
850  return err;
851  if (st->request_probe <= 0) {
853  &s->internal->raw_packet_buffer_end, pkt);
855  return 0;
856  }
857  }
858 
859  ret = s->iformat->read_packet(s, pkt);
860  if (ret < 0) {
861  av_packet_unref(pkt);
862 
863  /* Some demuxers return FFERROR_REDO when they consume
864  data and discard it (ignored streams, junk, extradata).
865  We must re-call the demuxer to get the real packet. */
866  if (ret == FFERROR_REDO)
867  continue;
868  if (!pktl || ret == AVERROR(EAGAIN))
869  return ret;
870  for (i = 0; i < s->nb_streams; i++) {
871  st = s->streams[i];
872  if (st->probe_packets || st->request_probe > 0)
873  if ((err = probe_codec(s, st, NULL)) < 0)
874  return err;
875  av_assert0(st->request_probe <= 0);
876  }
877  continue;
878  }
879 
880  err = av_packet_make_refcounted(pkt);
881  if (err < 0) {
882  av_packet_unref(pkt);
883  return err;
884  }
885 
886  if ((s->flags & AVFMT_FLAG_DISCARD_CORRUPT) &&
887  (pkt->flags & AV_PKT_FLAG_CORRUPT)) {
889  "Dropped corrupted packet (stream = %d)\n",
890  pkt->stream_index);
891  av_packet_unref(pkt);
892  continue;
893  }
894 
895  av_assert0(pkt->stream_index < (unsigned)s->nb_streams &&
896  "Invalid stream index.\n");
897 
898  st = s->streams[pkt->stream_index];
899 
901  // correct first time stamps to negative values
902  if (!is_relative(st->first_dts))
903  st->first_dts = wrap_timestamp(st, st->first_dts);
904  if (!is_relative(st->start_time))
905  st->start_time = wrap_timestamp(st, st->start_time);
906  if (!is_relative(st->cur_dts))
907  st->cur_dts = wrap_timestamp(st, st->cur_dts);
908  }
909 
910  pkt->dts = wrap_timestamp(st, pkt->dts);
911  pkt->pts = wrap_timestamp(st, pkt->pts);
912 
913  force_codec_ids(s, st);
914 
915  /* TODO: audio: time filter; video: frame reordering (pts != dts) */
917  pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
918 
919  if (!pktl && st->request_probe <= 0)
920  return ret;
921 
924  pkt, 0);
925  if (err < 0) {
926  av_packet_unref(pkt);
927  return err;
928  }
929  pkt1 = &s->internal->raw_packet_buffer_end->pkt;
931 
932  if ((err = probe_codec(s, st, pkt1)) < 0)
933  return err;
934  }
935 }
936 
937 
938 /**********************************************************/
939 
941 {
942  switch(avctx->codec_id) {
943  case AV_CODEC_ID_MP1:
944  case AV_CODEC_ID_MP2:
945  case AV_CODEC_ID_MP3:
946  case AV_CODEC_ID_CODEC2:
947  return 1;
948  }
949 
950  return 0;
951 }
952 
953 /**
954  * Return the frame duration in seconds. Return 0 if not available.
955  */
956 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
958 {
959  AVRational codec_framerate = s->iformat ? st->internal->avctx->framerate :
960  av_mul_q(av_inv_q(st->internal->avctx->time_base), (AVRational){1, st->internal->avctx->ticks_per_frame});
961  int frame_size, sample_rate;
962 
963 #if FF_API_LAVF_AVCTX
965  if ((!codec_framerate.den || !codec_framerate.num) && st->codec->time_base.den && st->codec->time_base.num)
966  codec_framerate = av_mul_q(av_inv_q(st->codec->time_base), (AVRational){1, st->codec->ticks_per_frame});
968 #endif
969 
970  *pnum = 0;
971  *pden = 0;
972  switch (st->codecpar->codec_type) {
973  case AVMEDIA_TYPE_VIDEO:
974  if (st->r_frame_rate.num && !pc && s->iformat) {
975  *pnum = st->r_frame_rate.den;
976  *pden = st->r_frame_rate.num;
977  } else if (st->time_base.num * 1000LL > st->time_base.den) {
978  *pnum = st->time_base.num;
979  *pden = st->time_base.den;
980  } else if (codec_framerate.den * 1000LL > codec_framerate.num) {
982  av_reduce(pnum, pden,
983  codec_framerate.den,
984  codec_framerate.num * (int64_t)st->internal->avctx->ticks_per_frame,
985  INT_MAX);
986 
987  if (pc && pc->repeat_pict) {
988  av_assert0(s->iformat); // this may be wrong for interlaced encoding but its not used for that case
989  av_reduce(pnum, pden,
990  (*pnum) * (1LL + pc->repeat_pict),
991  (*pden),
992  INT_MAX);
993  }
994  /* If this codec can be interlaced or progressive then we need
995  * a parser to compute duration of a packet. Thus if we have
996  * no parser in such case leave duration undefined. */
997  if (st->internal->avctx->ticks_per_frame > 1 && !pc)
998  *pnum = *pden = 0;
999  }
1000  break;
1001  case AVMEDIA_TYPE_AUDIO:
1002  if (st->internal->avctx_inited) {
1003  frame_size = av_get_audio_frame_duration(st->internal->avctx, pkt->size);
1004  sample_rate = st->internal->avctx->sample_rate;
1005  } else {
1006  frame_size = av_get_audio_frame_duration2(st->codecpar, pkt->size);
1007  sample_rate = st->codecpar->sample_rate;
1008  }
1009  if (frame_size <= 0 || sample_rate <= 0)
1010  break;
1011  *pnum = frame_size;
1012  *pden = sample_rate;
1013  break;
1014  default:
1015  break;
1016  }
1017 }
1018 
1019 static int is_intra_only(enum AVCodecID id)
1020 {
1022  if (!d)
1023  return 0;
1025  return 0;
1026  return 1;
1027 }
1028 
1030 {
1031  if (st->codecpar->codec_id != AV_CODEC_ID_H264) return 1;
1032  if (!st->info) // if we have left find_stream_info then nb_decoded_frames won't increase anymore for stream copy
1033  return 1;
1034 #if CONFIG_H264_DECODER
1035  if (st->internal->avctx->has_b_frames &&
1037  return 1;
1038 #endif
1039  if (st->internal->avctx->has_b_frames<3)
1040  return st->nb_decoded_frames >= 7;
1041  else if (st->internal->avctx->has_b_frames<4)
1042  return st->nb_decoded_frames >= 18;
1043  else
1044  return st->nb_decoded_frames >= 20;
1045 }
1046 
1048 {
1049  if (pktl->next)
1050  return pktl->next;
1051  if (pktl == s->internal->packet_buffer_end)
1052  return s->internal->parse_queue;
1053  return NULL;
1054 }
1055 
1056 static int64_t select_from_pts_buffer(AVStream *st, int64_t *pts_buffer, int64_t dts) {
1057  int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
1059 
1060  if(!onein_oneout) {
1061  int delay = st->internal->avctx->has_b_frames;
1062  int i;
1063 
1064  if (dts == AV_NOPTS_VALUE) {
1065  int64_t best_score = INT64_MAX;
1066  for (i = 0; i<delay; i++) {
1067  if (st->pts_reorder_error_count[i]) {
1068  int64_t score = st->pts_reorder_error[i] / st->pts_reorder_error_count[i];
1069  if (score < best_score) {
1070  best_score = score;
1071  dts = pts_buffer[i];
1072  }
1073  }
1074  }
1075  } else {
1076  for (i = 0; i<delay; i++) {
1077  if (pts_buffer[i] != AV_NOPTS_VALUE) {
1078  int64_t diff = FFABS(pts_buffer[i] - dts)
1079  + (uint64_t)st->pts_reorder_error[i];
1080  diff = FFMAX(diff, st->pts_reorder_error[i]);
1081  st->pts_reorder_error[i] = diff;
1082  st->pts_reorder_error_count[i]++;
1083  if (st->pts_reorder_error_count[i] > 250) {
1084  st->pts_reorder_error[i] >>= 1;
1085  st->pts_reorder_error_count[i] >>= 1;
1086  }
1087  }
1088  }
1089  }
1090  }
1091 
1092  if (dts == AV_NOPTS_VALUE)
1093  dts = pts_buffer[0];
1094 
1095  return dts;
1096 }
1097 
1098 /**
1099  * Updates the dts of packets of a stream in pkt_buffer, by re-ordering the pts
1100  * of the packets in a window.
1101  */
1102 static void update_dts_from_pts(AVFormatContext *s, int stream_index,
1103  AVPacketList *pkt_buffer)
1104 {
1105  AVStream *st = s->streams[stream_index];
1106  int delay = st->internal->avctx->has_b_frames;
1107  int i;
1108 
1109  int64_t pts_buffer[MAX_REORDER_DELAY+1];
1110 
1111  for (i = 0; i<MAX_REORDER_DELAY+1; i++)
1112  pts_buffer[i] = AV_NOPTS_VALUE;
1113 
1114  for (; pkt_buffer; pkt_buffer = get_next_pkt(s, st, pkt_buffer)) {
1115  if (pkt_buffer->pkt.stream_index != stream_index)
1116  continue;
1117 
1118  if (pkt_buffer->pkt.pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
1119  pts_buffer[0] = pkt_buffer->pkt.pts;
1120  for (i = 0; i<delay && pts_buffer[i] > pts_buffer[i + 1]; i++)
1121  FFSWAP(int64_t, pts_buffer[i], pts_buffer[i + 1]);
1122 
1123  pkt_buffer->pkt.dts = select_from_pts_buffer(st, pts_buffer, pkt_buffer->pkt.dts);
1124  }
1125  }
1126 }
1127 
1128 static void update_initial_timestamps(AVFormatContext *s, int stream_index,
1129  int64_t dts, int64_t pts, AVPacket *pkt)
1130 {
1131  AVStream *st = s->streams[stream_index];
1133  AVPacketList *pktl_it;
1134 
1135  uint64_t shift;
1136 
1137  if (st->first_dts != AV_NOPTS_VALUE ||
1138  dts == AV_NOPTS_VALUE ||
1139  st->cur_dts == AV_NOPTS_VALUE ||
1140  st->cur_dts < INT_MIN + RELATIVE_TS_BASE ||
1141  is_relative(dts))
1142  return;
1143 
1144  st->first_dts = dts - (st->cur_dts - RELATIVE_TS_BASE);
1145  st->cur_dts = dts;
1146  shift = (uint64_t)st->first_dts - RELATIVE_TS_BASE;
1147 
1148  if (is_relative(pts))
1149  pts += shift;
1150 
1151  for (pktl_it = pktl; pktl_it; pktl_it = get_next_pkt(s, st, pktl_it)) {
1152  if (pktl_it->pkt.stream_index != stream_index)
1153  continue;
1154  if (is_relative(pktl_it->pkt.pts))
1155  pktl_it->pkt.pts += shift;
1156 
1157  if (is_relative(pktl_it->pkt.dts))
1158  pktl_it->pkt.dts += shift;
1159 
1160  if (st->start_time == AV_NOPTS_VALUE && pktl_it->pkt.pts != AV_NOPTS_VALUE) {
1161  st->start_time = pktl_it->pkt.pts;
1163  st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
1164  }
1165  }
1166 
1168  update_dts_from_pts(s, stream_index, pktl);
1169  }
1170 
1171  if (st->start_time == AV_NOPTS_VALUE) {
1172  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || !(pkt->flags & AV_PKT_FLAG_DISCARD)) {
1173  st->start_time = pts;
1174  }
1176  st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
1177  }
1178 }
1179 
1181  int stream_index, int duration)
1182 {
1184  int64_t cur_dts = RELATIVE_TS_BASE;
1185 
1186  if (st->first_dts != AV_NOPTS_VALUE) {
1188  return;
1190  cur_dts = st->first_dts;
1191  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
1192  if (pktl->pkt.stream_index == stream_index) {
1193  if (pktl->pkt.pts != pktl->pkt.dts ||
1194  pktl->pkt.dts != AV_NOPTS_VALUE ||
1195  pktl->pkt.duration)
1196  break;
1197  cur_dts -= duration;
1198  }
1199  }
1200  if (pktl && pktl->pkt.dts != st->first_dts) {
1201  av_log(s, AV_LOG_DEBUG, "first_dts %s not matching first dts %s (pts %s, duration %"PRId64") in the queue\n",
1202  av_ts2str(st->first_dts), av_ts2str(pktl->pkt.dts), av_ts2str(pktl->pkt.pts), pktl->pkt.duration);
1203  return;
1204  }
1205  if (!pktl) {
1206  av_log(s, AV_LOG_DEBUG, "first_dts %s but no packet with dts in the queue\n", av_ts2str(st->first_dts));
1207  return;
1208  }
1210  st->first_dts = cur_dts;
1211  } else if (st->cur_dts != RELATIVE_TS_BASE)
1212  return;
1213 
1214  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
1215  if (pktl->pkt.stream_index != stream_index)
1216  continue;
1217  if ((pktl->pkt.pts == pktl->pkt.dts ||
1218  pktl->pkt.pts == AV_NOPTS_VALUE) &&
1219  (pktl->pkt.dts == AV_NOPTS_VALUE ||
1220  pktl->pkt.dts == st->first_dts ||
1221  pktl->pkt.dts == RELATIVE_TS_BASE) &&
1222  !pktl->pkt.duration) {
1223  pktl->pkt.dts = cur_dts;
1224  if (!st->internal->avctx->has_b_frames)
1225  pktl->pkt.pts = cur_dts;
1226 // if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1227  pktl->pkt.duration = duration;
1228  } else
1229  break;
1230  cur_dts = pktl->pkt.dts + pktl->pkt.duration;
1231  }
1232  if (!pktl)
1233  st->cur_dts = cur_dts;
1234 }
1235 
1238  int64_t next_dts, int64_t next_pts)
1239 {
1240  int num, den, presentation_delayed, delay, i;
1241  int64_t offset;
1243  int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
1245 
1246  if (s->flags & AVFMT_FLAG_NOFILLIN)
1247  return;
1248 
1249  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && pkt->dts != AV_NOPTS_VALUE) {
1250  if (pkt->dts == pkt->pts && st->last_dts_for_order_check != AV_NOPTS_VALUE) {
1251  if (st->last_dts_for_order_check <= pkt->dts) {
1252  st->dts_ordered++;
1253  } else {
1255  "DTS %"PRIi64" < %"PRIi64" out of order\n",
1256  pkt->dts,
1258  st->dts_misordered++;
1259  }
1260  if (st->dts_ordered + st->dts_misordered > 250) {
1261  st->dts_ordered >>= 1;
1262  st->dts_misordered >>= 1;
1263  }
1264  }
1265 
1266  st->last_dts_for_order_check = pkt->dts;
1267  if (st->dts_ordered < 8*st->dts_misordered && pkt->dts == pkt->pts)
1268  pkt->dts = AV_NOPTS_VALUE;
1269  }
1270 
1271  if ((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
1272  pkt->dts = AV_NOPTS_VALUE;
1273 
1274  if (pc && pc->pict_type == AV_PICTURE_TYPE_B
1275  && !st->internal->avctx->has_b_frames)
1276  //FIXME Set low_delay = 0 when has_b_frames = 1
1277  st->internal->avctx->has_b_frames = 1;
1278 
1279  /* do we have a video B-frame ? */
1280  delay = st->internal->avctx->has_b_frames;
1281  presentation_delayed = 0;
1282 
1283  /* XXX: need has_b_frame, but cannot get it if the codec is
1284  * not initialized */
1285  if (delay &&
1286  pc && pc->pict_type != AV_PICTURE_TYPE_B)
1287  presentation_delayed = 1;
1288 
1289  if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
1290  st->pts_wrap_bits < 63 &&
1291  pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
1292  if (is_relative(st->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > st->cur_dts) {
1293  pkt->dts -= 1LL << st->pts_wrap_bits;
1294  } else
1295  pkt->pts += 1LL << st->pts_wrap_bits;
1296  }
1297 
1298  /* Some MPEG-2 in MPEG-PS lack dts (issue #171 / input_file.mpg).
1299  * We take the conservative approach and discard both.
1300  * Note: If this is misbehaving for an H.264 file, then possibly
1301  * presentation_delayed is not set correctly. */
1302  if (delay == 1 && pkt->dts == pkt->pts &&
1303  pkt->dts != AV_NOPTS_VALUE && presentation_delayed) {
1304  av_log(s, AV_LOG_DEBUG, "invalid dts/pts combination %"PRIi64"\n", pkt->dts);
1305  if ( strcmp(s->iformat->name, "mov,mp4,m4a,3gp,3g2,mj2")
1306  && strcmp(s->iformat->name, "flv")) // otherwise we discard correct timestamps for vc1-wmapro.ism
1307  pkt->dts = AV_NOPTS_VALUE;
1308  }
1309 
1310  duration = av_mul_q((AVRational) {pkt->duration, 1}, st->time_base);
1311  if (pkt->duration <= 0) {
1312  ff_compute_frame_duration(s, &num, &den, st, pc, pkt);
1313  if (den && num) {
1314  duration = (AVRational) {num, den};
1315  pkt->duration = av_rescale_rnd(1,
1316  num * (int64_t) st->time_base.den,
1317  den * (int64_t) st->time_base.num,
1318  AV_ROUND_DOWN);
1319  }
1320  }
1321 
1322  if (pkt->duration > 0 && (s->internal->packet_buffer || s->internal->parse_queue))
1323  update_initial_durations(s, st, pkt->stream_index, pkt->duration);
1324 
1325  /* Correct timestamps with byte offset if demuxers only have timestamps
1326  * on packet boundaries */
1327  if (pc && st->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size) {
1328  /* this will estimate bitrate based on this frame's duration and size */
1329  offset = av_rescale(pc->offset, pkt->duration, pkt->size);
1330  if (pkt->pts != AV_NOPTS_VALUE)
1331  pkt->pts += offset;
1332  if (pkt->dts != AV_NOPTS_VALUE)
1333  pkt->dts += offset;
1334  }
1335 
1336  /* This may be redundant, but it should not hurt. */
1337  if (pkt->dts != AV_NOPTS_VALUE &&
1338  pkt->pts != AV_NOPTS_VALUE &&
1339  pkt->pts > pkt->dts)
1340  presentation_delayed = 1;
1341 
1342  if (s->debug & FF_FDEBUG_TS)
1343  av_log(s, AV_LOG_DEBUG,
1344  "IN delayed:%d pts:%s, dts:%s cur_dts:%s st:%d pc:%p duration:%"PRId64" delay:%d onein_oneout:%d\n",
1345  presentation_delayed, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts),
1346  pkt->stream_index, pc, pkt->duration, delay, onein_oneout);
1347 
1348  /* Interpolate PTS and DTS if they are not present. We skip H264
1349  * currently because delay and has_b_frames are not reliably set. */
1350  if ((delay == 0 || (delay == 1 && pc)) &&
1351  onein_oneout) {
1352  if (presentation_delayed) {
1353  /* DTS = decompression timestamp */
1354  /* PTS = presentation timestamp */
1355  if (pkt->dts == AV_NOPTS_VALUE)
1356  pkt->dts = st->last_IP_pts;
1357  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1358  if (pkt->dts == AV_NOPTS_VALUE)
1359  pkt->dts = st->cur_dts;
1360 
1361  /* This is tricky: the dts must be incremented by the duration
1362  * of the frame we are displaying, i.e. the last I- or P-frame. */
1363  if (st->last_IP_duration == 0 && (uint64_t)pkt->duration <= INT32_MAX)
1364  st->last_IP_duration = pkt->duration;
1365  if (pkt->dts != AV_NOPTS_VALUE)
1366  st->cur_dts = pkt->dts + st->last_IP_duration;
1367  if (pkt->dts != AV_NOPTS_VALUE &&
1368  pkt->pts == AV_NOPTS_VALUE &&
1369  st->last_IP_duration > 0 &&
1370  ((uint64_t)st->cur_dts - (uint64_t)next_dts + 1) <= 2 &&
1371  next_dts != next_pts &&
1372  next_pts != AV_NOPTS_VALUE)
1373  pkt->pts = next_dts;
1374 
1375  if ((uint64_t)pkt->duration <= INT32_MAX)
1376  st->last_IP_duration = pkt->duration;
1377  st->last_IP_pts = pkt->pts;
1378  /* Cannot compute PTS if not present (we can compute it only
1379  * by knowing the future. */
1380  } else if (pkt->pts != AV_NOPTS_VALUE ||
1381  pkt->dts != AV_NOPTS_VALUE ||
1382  pkt->duration > 0 ) {
1383 
1384  /* presentation is not delayed : PTS and DTS are the same */
1385  if (pkt->pts == AV_NOPTS_VALUE)
1386  pkt->pts = pkt->dts;
1388  pkt->pts, pkt);
1389  if (pkt->pts == AV_NOPTS_VALUE)
1390  pkt->pts = st->cur_dts;
1391  pkt->dts = pkt->pts;
1392  if (pkt->pts != AV_NOPTS_VALUE && duration.num >= 0)
1393  st->cur_dts = av_add_stable(st->time_base, pkt->pts, duration, 1);
1394  }
1395  }
1396 
1397  if (pkt->pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
1398  st->pts_buffer[0] = pkt->pts;
1399  for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
1400  FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
1401 
1403  pkt->dts = select_from_pts_buffer(st, st->pts_buffer, pkt->dts);
1404  }
1405  // We skipped it above so we try here.
1406  if (!onein_oneout)
1407  // This should happen on the first packet
1408  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1409  if (pkt->dts > st->cur_dts)
1410  st->cur_dts = pkt->dts;
1411 
1412  if (s->debug & FF_FDEBUG_TS)
1413  av_log(s, AV_LOG_DEBUG, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s st:%d (%d)\n",
1414  presentation_delayed, delay, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), st->index, st->id);
1415 
1416  /* update flags */
1418  pkt->flags |= AV_PKT_FLAG_KEY;
1419 #if FF_API_CONVERGENCE_DURATION
1421  if (pc)
1424 #endif
1425 }
1426 
1427 void ff_packet_list_free(AVPacketList **pkt_buf, AVPacketList **pkt_buf_end)
1428 {
1429  AVPacketList *tmp = *pkt_buf;
1430 
1431  while (tmp) {
1432  AVPacketList *pktl = tmp;
1433  tmp = pktl->next;
1434  av_packet_unref(&pktl->pkt);
1435  av_freep(&pktl);
1436  }
1437  *pkt_buf = NULL;
1438  *pkt_buf_end = NULL;
1439 }
1440 
1441 /**
1442  * Parse a packet, add all split parts to parse_queue.
1443  *
1444  * @param pkt Packet to parse; must not be NULL.
1445  * @param flush Indicates whether to flush. If set, pkt must be blank.
1446  */
1448  int stream_index, int flush)
1449 {
1450  AVPacket out_pkt;
1451  AVStream *st = s->streams[stream_index];
1452  uint8_t *data = pkt->data;
1453  int size = pkt->size;
1454  int ret = 0, got_output = flush;
1455 
1456  if (size || flush) {
1457  av_init_packet(&out_pkt);
1458  } else if (st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
1459  // preserve 0-size sync packets
1461  }
1462 
1463  while (size > 0 || (flush && got_output)) {
1464  int len;
1465  int64_t next_pts = pkt->pts;
1466  int64_t next_dts = pkt->dts;
1467 
1468  len = av_parser_parse2(st->parser, st->internal->avctx,
1469  &out_pkt.data, &out_pkt.size, data, size,
1470  pkt->pts, pkt->dts, pkt->pos);
1471 
1472  pkt->pts = pkt->dts = AV_NOPTS_VALUE;
1473  pkt->pos = -1;
1474  /* increment read pointer */
1475  data += len;
1476  size -= len;
1477 
1478  got_output = !!out_pkt.size;
1479 
1480  if (!out_pkt.size)
1481  continue;
1482 
1483  if (pkt->buf && out_pkt.data == pkt->data) {
1484  /* reference pkt->buf only when out_pkt.data is guaranteed to point
1485  * to data in it and not in the parser's internal buffer. */
1486  /* XXX: Ensure this is the case with all parsers when st->parser->flags
1487  * is PARSER_FLAG_COMPLETE_FRAMES and check for that instead? */
1488  out_pkt.buf = av_buffer_ref(pkt->buf);
1489  if (!out_pkt.buf) {
1490  ret = AVERROR(ENOMEM);
1491  goto fail;
1492  }
1493  } else {
1494  ret = av_packet_make_refcounted(&out_pkt);
1495  if (ret < 0)
1496  goto fail;
1497  }
1498 
1499  if (pkt->side_data) {
1500  out_pkt.side_data = pkt->side_data;
1501  out_pkt.side_data_elems = pkt->side_data_elems;
1502  pkt->side_data = NULL;
1503  pkt->side_data_elems = 0;
1504  }
1505 
1506  /* set the duration */
1507  out_pkt.duration = (st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) ? pkt->duration : 0;
1509  if (st->internal->avctx->sample_rate > 0) {
1510  out_pkt.duration =
1512  (AVRational) { 1, st->internal->avctx->sample_rate },
1513  st->time_base,
1514  AV_ROUND_DOWN);
1515  }
1516  }
1517 
1518  out_pkt.stream_index = st->index;
1519  out_pkt.pts = st->parser->pts;
1520  out_pkt.dts = st->parser->dts;
1521  out_pkt.pos = st->parser->pos;
1522  out_pkt.flags |= pkt->flags & AV_PKT_FLAG_DISCARD;
1523 
1525  out_pkt.pos = st->parser->frame_offset;
1526 
1527  if (st->parser->key_frame == 1 ||
1528  (st->parser->key_frame == -1 &&
1530  out_pkt.flags |= AV_PKT_FLAG_KEY;
1531 
1532  if (st->parser->key_frame == -1 && st->parser->pict_type ==AV_PICTURE_TYPE_NONE && (pkt->flags&AV_PKT_FLAG_KEY))
1533  out_pkt.flags |= AV_PKT_FLAG_KEY;
1534 
1535  compute_pkt_fields(s, st, st->parser, &out_pkt, next_dts, next_pts);
1536 
1539  &out_pkt, 0);
1540  if (ret < 0) {
1541  av_packet_unref(&out_pkt);
1542  goto fail;
1543  }
1544  }
1545 
1546  /* end of the stream => close and free the parser */
1547  if (flush) {
1548  av_parser_close(st->parser);
1549  st->parser = NULL;
1550  }
1551 
1552 fail:
1553  av_packet_unref(pkt);
1554  return ret;
1555 }
1556 
1558  AVPacketList **pkt_buffer_end,
1559  AVPacket *pkt)
1560 {
1561  AVPacketList *pktl;
1562  av_assert0(*pkt_buffer);
1563  pktl = *pkt_buffer;
1564  *pkt = pktl->pkt;
1565  *pkt_buffer = pktl->next;
1566  if (!pktl->next)
1567  *pkt_buffer_end = NULL;
1568  av_freep(&pktl);
1569  return 0;
1570 }
1571 
1572 static int64_t ts_to_samples(AVStream *st, int64_t ts)
1573 {
1574  return av_rescale(ts, st->time_base.num * st->codecpar->sample_rate, st->time_base.den);
1575 }
1576 
1578 {
1579  int ret, i, got_packet = 0;
1580  AVDictionary *metadata = NULL;
1581 
1582  while (!got_packet && !s->internal->parse_queue) {
1583  AVStream *st;
1584 
1585  /* read next packet */
1586  ret = ff_read_packet(s, pkt);
1587  if (ret < 0) {
1588  if (ret == AVERROR(EAGAIN))
1589  return ret;
1590  /* flush the parsers */
1591  for (i = 0; i < s->nb_streams; i++) {
1592  st = s->streams[i];
1593  if (st->parser && st->need_parsing)
1594  parse_packet(s, pkt, st->index, 1);
1595  }
1596  /* all remaining packets are now in parse_queue =>
1597  * really terminate parsing */
1598  break;
1599  }
1600  ret = 0;
1601  st = s->streams[pkt->stream_index];
1602 
1603  /* update context if required */
1604  if (st->internal->need_context_update) {
1605  if (avcodec_is_open(st->internal->avctx)) {
1606  av_log(s, AV_LOG_DEBUG, "Demuxer context update while decoder is open, closing and trying to re-open\n");
1608  st->info->found_decoder = 0;
1609  }
1610 
1611  /* close parser, because it depends on the codec */
1612  if (st->parser && st->internal->avctx->codec_id != st->codecpar->codec_id) {
1613  av_parser_close(st->parser);
1614  st->parser = NULL;
1615  }
1616 
1618  if (ret < 0) {
1619  av_packet_unref(pkt);
1620  return ret;
1621  }
1622 
1623 #if FF_API_LAVF_AVCTX
1625  /* update deprecated public codec context */
1626  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
1627  if (ret < 0) {
1628  av_packet_unref(pkt);
1629  return ret;
1630  }
1632 #endif
1633 
1634  st->internal->need_context_update = 0;
1635  }
1636 
1637  if (pkt->pts != AV_NOPTS_VALUE &&
1638  pkt->dts != AV_NOPTS_VALUE &&
1639  pkt->pts < pkt->dts) {
1641  "Invalid timestamps stream=%d, pts=%s, dts=%s, size=%d\n",
1642  pkt->stream_index,
1643  av_ts2str(pkt->pts),
1644  av_ts2str(pkt->dts),
1645  pkt->size);
1646  }
1647  if (s->debug & FF_FDEBUG_TS)
1648  av_log(s, AV_LOG_DEBUG,
1649  "ff_read_packet stream=%d, pts=%s, dts=%s, size=%d, duration=%"PRId64", flags=%d\n",
1650  pkt->stream_index,
1651  av_ts2str(pkt->pts),
1652  av_ts2str(pkt->dts),
1653  pkt->size, pkt->duration, pkt->flags);
1654 
1655  if (st->need_parsing && !st->parser && !(s->flags & AVFMT_FLAG_NOPARSE)) {
1656  st->parser = av_parser_init(st->codecpar->codec_id);
1657  if (!st->parser) {
1658  av_log(s, AV_LOG_VERBOSE, "parser not found for codec "
1659  "%s, packets or times may be invalid.\n",
1661  /* no parser available: just output the raw packets */
1663  } else if (st->need_parsing == AVSTREAM_PARSE_HEADERS)
1665  else if (st->need_parsing == AVSTREAM_PARSE_FULL_ONCE)
1666  st->parser->flags |= PARSER_FLAG_ONCE;
1667  else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW)
1669  }
1670 
1671  if (!st->need_parsing || !st->parser) {
1672  /* no parsing needed: we just output the packet as is */
1674  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) &&
1675  (pkt->flags & AV_PKT_FLAG_KEY) && pkt->dts != AV_NOPTS_VALUE) {
1676  ff_reduce_index(s, st->index);
1677  av_add_index_entry(st, pkt->pos, pkt->dts,
1678  0, 0, AVINDEX_KEYFRAME);
1679  }
1680  got_packet = 1;
1681  } else if (st->discard < AVDISCARD_ALL) {
1682  if ((ret = parse_packet(s, pkt, pkt->stream_index, 0)) < 0)
1683  return ret;
1685  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
1686  st->codecpar->channels = st->internal->avctx->channels;
1688  st->codecpar->codec_id = st->internal->avctx->codec_id;
1689  } else {
1690  /* free packet */
1691  av_packet_unref(pkt);
1692  }
1693  if (pkt->flags & AV_PKT_FLAG_KEY)
1694  st->skip_to_keyframe = 0;
1695  if (st->skip_to_keyframe) {
1696  av_packet_unref(pkt);
1697  got_packet = 0;
1698  }
1699  }
1700 
1701  if (!got_packet && s->internal->parse_queue)
1703 
1704  if (ret >= 0) {
1705  AVStream *st = s->streams[pkt->stream_index];
1706  int discard_padding = 0;
1707  if (st->first_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
1708  int64_t pts = pkt->pts - (is_relative(pkt->pts) ? RELATIVE_TS_BASE : 0);
1709  int64_t sample = ts_to_samples(st, pts);
1710  int duration = ts_to_samples(st, pkt->duration);
1711  int64_t end_sample = sample + duration;
1712  if (duration > 0 && end_sample >= st->first_discard_sample &&
1713  sample < st->last_discard_sample)
1714  discard_padding = FFMIN(end_sample - st->first_discard_sample, duration);
1715  }
1716  if (st->start_skip_samples && (pkt->pts == 0 || pkt->pts == RELATIVE_TS_BASE))
1717  st->skip_samples = st->start_skip_samples;
1718  if (st->skip_samples || discard_padding) {
1720  if (p) {
1721  AV_WL32(p, st->skip_samples);
1722  AV_WL32(p + 4, discard_padding);
1723  av_log(s, AV_LOG_DEBUG, "demuxer injecting skip %d / discard %d\n", st->skip_samples, discard_padding);
1724  }
1725  st->skip_samples = 0;
1726  }
1727 
1728  if (st->inject_global_side_data) {
1729  for (i = 0; i < st->nb_side_data; i++) {
1730  AVPacketSideData *src_sd = &st->side_data[i];
1731  uint8_t *dst_data;
1732 
1733  if (av_packet_get_side_data(pkt, src_sd->type, NULL))
1734  continue;
1735 
1736  dst_data = av_packet_new_side_data(pkt, src_sd->type, src_sd->size);
1737  if (!dst_data) {
1738  av_log(s, AV_LOG_WARNING, "Could not inject global side data\n");
1739  continue;
1740  }
1741 
1742  memcpy(dst_data, src_sd->data, src_sd->size);
1743  }
1744  st->inject_global_side_data = 0;
1745  }
1746  }
1747 
1748  av_opt_get_dict_val(s, "metadata", AV_OPT_SEARCH_CHILDREN, &metadata);
1749  if (metadata) {
1751  av_dict_copy(&s->metadata, metadata, 0);
1752  av_dict_free(&metadata);
1754  }
1755 
1756 #if FF_API_LAVF_AVCTX
1758 #endif
1759 
1760  if (s->debug & FF_FDEBUG_TS)
1761  av_log(s, AV_LOG_DEBUG,
1762  "read_frame_internal stream=%d, pts=%s, dts=%s, "
1763  "size=%d, duration=%"PRId64", flags=%d\n",
1764  pkt->stream_index,
1765  av_ts2str(pkt->pts),
1766  av_ts2str(pkt->dts),
1767  pkt->size, pkt->duration, pkt->flags);
1768 
1769  /* A demuxer might have returned EOF because of an IO error, let's
1770  * propagate this back to the user. */
1771  if (ret == AVERROR_EOF && s->pb && s->pb->error < 0 && s->pb->error != AVERROR(EAGAIN))
1772  ret = s->pb->error;
1773 
1774  return ret;
1775 }
1776 
1778 {
1779  const int genpts = s->flags & AVFMT_FLAG_GENPTS;
1780  int eof = 0;
1781  int ret;
1782  AVStream *st;
1783 
1784  if (!genpts) {
1785  ret = s->internal->packet_buffer
1787  &s->internal->packet_buffer_end, pkt)
1788  : read_frame_internal(s, pkt);
1789  if (ret < 0)
1790  return ret;
1791  goto return_packet;
1792  }
1793 
1794  for (;;) {
1795  AVPacketList *pktl = s->internal->packet_buffer;
1796 
1797  if (pktl) {
1798  AVPacket *next_pkt = &pktl->pkt;
1799 
1800  if (next_pkt->dts != AV_NOPTS_VALUE) {
1801  int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits;
1802  // last dts seen for this stream. if any of packets following
1803  // current one had no dts, we will set this to AV_NOPTS_VALUE.
1804  int64_t last_dts = next_pkt->dts;
1805  av_assert2(wrap_bits <= 64);
1806  while (pktl && next_pkt->pts == AV_NOPTS_VALUE) {
1807  if (pktl->pkt.stream_index == next_pkt->stream_index &&
1808  av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2ULL << (wrap_bits - 1)) < 0) {
1809  if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2ULL << (wrap_bits - 1))) {
1810  // not B-frame
1811  next_pkt->pts = pktl->pkt.dts;
1812  }
1813  if (last_dts != AV_NOPTS_VALUE) {
1814  // Once last dts was set to AV_NOPTS_VALUE, we don't change it.
1815  last_dts = pktl->pkt.dts;
1816  }
1817  }
1818  pktl = pktl->next;
1819  }
1820  if (eof && next_pkt->pts == AV_NOPTS_VALUE && last_dts != AV_NOPTS_VALUE) {
1821  // Fixing the last reference frame had none pts issue (For MXF etc).
1822  // We only do this when
1823  // 1. eof.
1824  // 2. we are not able to resolve a pts value for current packet.
1825  // 3. the packets for this stream at the end of the files had valid dts.
1826  next_pkt->pts = last_dts + next_pkt->duration;
1827  }
1828  pktl = s->internal->packet_buffer;
1829  }
1830 
1831  /* read packet from packet buffer, if there is data */
1832  st = s->streams[next_pkt->stream_index];
1833  if (!(next_pkt->pts == AV_NOPTS_VALUE && st->discard < AVDISCARD_ALL &&
1834  next_pkt->dts != AV_NOPTS_VALUE && !eof)) {
1836  &s->internal->packet_buffer_end, pkt);
1837  goto return_packet;
1838  }
1839  }
1840 
1841  ret = read_frame_internal(s, pkt);
1842  if (ret < 0) {
1843  if (pktl && ret != AVERROR(EAGAIN)) {
1844  eof = 1;
1845  continue;
1846  } else
1847  return ret;
1848  }
1849 
1852  pkt, 0);
1853  if (ret < 0) {
1854  av_packet_unref(pkt);
1855  return ret;
1856  }
1857  }
1858 
1859 return_packet:
1860 
1861  st = s->streams[pkt->stream_index];
1862  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & AV_PKT_FLAG_KEY) {
1863  ff_reduce_index(s, st->index);
1864  av_add_index_entry(st, pkt->pos, pkt->dts, 0, 0, AVINDEX_KEYFRAME);
1865  }
1866 
1867  if (is_relative(pkt->dts))
1868  pkt->dts -= RELATIVE_TS_BASE;
1869  if (is_relative(pkt->pts))
1870  pkt->pts -= RELATIVE_TS_BASE;
1871 
1872  return ret;
1873 }
1874 
1875 /* XXX: suppress the packet queue */
1877 {
1878  if (!s->internal)
1879  return;
1883 
1885 }
1886 
1887 /*******************************************************/
1888 /* seek support */
1889 
1891 {
1892  int i;
1893  AVStream *st;
1894  int best_stream = 0;
1895  int best_score = INT_MIN;
1896 
1897  if (s->nb_streams <= 0)
1898  return -1;
1899  for (i = 0; i < s->nb_streams; i++) {
1900  int score = 0;
1901  st = s->streams[i];
1902  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1904  score -= 400;
1905  if (st->codecpar->width && st->codecpar->height)
1906  score += 50;
1907  score+= 25;
1908  }
1909  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
1910  if (st->codecpar->sample_rate)
1911  score += 50;
1912  }
1913  if (st->codec_info_nb_frames)
1914  score += 12;
1915 
1916  if (st->discard != AVDISCARD_ALL)
1917  score += 200;
1918 
1919  if (score > best_score) {
1920  best_score = score;
1921  best_stream = i;
1922  }
1923  }
1924  return best_stream;
1925 }
1926 
1927 /** Flush the frame reader. */
1929 {
1930  AVStream *st;
1931  int i, j;
1932 
1933  flush_packet_queue(s);
1934 
1935  /* Reset read state for each stream. */
1936  for (i = 0; i < s->nb_streams; i++) {
1937  st = s->streams[i];
1938 
1939  if (st->parser) {
1940  av_parser_close(st->parser);
1941  st->parser = NULL;
1942  }
1945  if (st->first_dts == AV_NOPTS_VALUE)
1946  st->cur_dts = RELATIVE_TS_BASE;
1947  else
1948  /* We set the current DTS to an unspecified origin. */
1949  st->cur_dts = AV_NOPTS_VALUE;
1950 
1952 
1953  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
1954  st->pts_buffer[j] = AV_NOPTS_VALUE;
1955 
1957  st->inject_global_side_data = 1;
1958 
1959  st->skip_samples = 0;
1960  }
1961 }
1962 
1963 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
1964 {
1965  int i;
1966 
1967  for (i = 0; i < s->nb_streams; i++) {
1968  AVStream *st = s->streams[i];
1969 
1970  st->cur_dts =
1971  av_rescale(timestamp,
1972  st->time_base.den * (int64_t) ref_st->time_base.num,
1973  st->time_base.num * (int64_t) ref_st->time_base.den);
1974  }
1975 }
1976 
1977 void ff_reduce_index(AVFormatContext *s, int stream_index)
1978 {
1979  AVStream *st = s->streams[stream_index];
1980  unsigned int max_entries = s->max_index_size / sizeof(AVIndexEntry);
1981 
1982  if ((unsigned) st->nb_index_entries >= max_entries) {
1983  int i;
1984  for (i = 0; 2 * i < st->nb_index_entries; i++)
1985  st->index_entries[i] = st->index_entries[2 * i];
1986  st->nb_index_entries = i;
1987  }
1988 }
1989 
1990 int ff_add_index_entry(AVIndexEntry **index_entries,
1991  int *nb_index_entries,
1992  unsigned int *index_entries_allocated_size,
1993  int64_t pos, int64_t timestamp,
1994  int size, int distance, int flags)
1995 {
1996  AVIndexEntry *entries, *ie;
1997  int index;
1998 
1999  if ((unsigned) *nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
2000  return -1;
2001 
2002  if (timestamp == AV_NOPTS_VALUE)
2003  return AVERROR(EINVAL);
2004 
2005  if (size < 0 || size > 0x3FFFFFFF)
2006  return AVERROR(EINVAL);
2007 
2008  if (is_relative(timestamp)) //FIXME this maintains previous behavior but we should shift by the correct offset once known
2009  timestamp -= RELATIVE_TS_BASE;
2010 
2011  entries = av_fast_realloc(*index_entries,
2012  index_entries_allocated_size,
2013  (*nb_index_entries + 1) *
2014  sizeof(AVIndexEntry));
2015  if (!entries)
2016  return -1;
2017 
2018  *index_entries = entries;
2019 
2020  index = ff_index_search_timestamp(*index_entries, *nb_index_entries,
2021  timestamp, AVSEEK_FLAG_ANY);
2022 
2023  if (index < 0) {
2024  index = (*nb_index_entries)++;
2025  ie = &entries[index];
2026  av_assert0(index == 0 || ie[-1].timestamp < timestamp);
2027  } else {
2028  ie = &entries[index];
2029  if (ie->timestamp != timestamp) {
2030  if (ie->timestamp <= timestamp)
2031  return -1;
2032  memmove(entries + index + 1, entries + index,
2033  sizeof(AVIndexEntry) * (*nb_index_entries - index));
2034  (*nb_index_entries)++;
2035  } else if (ie->pos == pos && distance < ie->min_distance)
2036  // do not reduce the distance
2037  distance = ie->min_distance;
2038  }
2039 
2040  ie->pos = pos;
2041  ie->timestamp = timestamp;
2042  ie->min_distance = distance;
2043  ie->size = size;
2044  ie->flags = flags;
2045 
2046  return index;
2047 }
2048 
2049 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
2050  int size, int distance, int flags)
2051 {
2052  timestamp = wrap_timestamp(st, timestamp);
2054  &st->index_entries_allocated_size, pos,
2055  timestamp, size, distance, flags);
2056 }
2057 
2058 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
2059  int64_t wanted_timestamp, int flags)
2060 {
2061  int a, b, m;
2062  int64_t timestamp;
2063 
2064  a = -1;
2065  b = nb_entries;
2066 
2067  // Optimize appending index entries at the end.
2068  if (b && entries[b - 1].timestamp < wanted_timestamp)
2069  a = b - 1;
2070 
2071  while (b - a > 1) {
2072  m = (a + b) >> 1;
2073 
2074  // Search for the next non-discarded packet.
2075  while ((entries[m].flags & AVINDEX_DISCARD_FRAME) && m < b && m < nb_entries - 1) {
2076  m++;
2077  if (m == b && entries[m].timestamp >= wanted_timestamp) {
2078  m = b - 1;
2079  break;
2080  }
2081  }
2082 
2083  timestamp = entries[m].timestamp;
2084  if (timestamp >= wanted_timestamp)
2085  b = m;
2086  if (timestamp <= wanted_timestamp)
2087  a = m;
2088  }
2089  m = (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
2090 
2091  if (!(flags & AVSEEK_FLAG_ANY))
2092  while (m >= 0 && m < nb_entries &&
2093  !(entries[m].flags & AVINDEX_KEYFRAME))
2094  m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
2095 
2096  if (m == nb_entries)
2097  return -1;
2098  return m;
2099 }
2100 
2101 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
2102 {
2103  int ist1, ist2;
2104  int64_t pos_delta = 0;
2105  int64_t skip = 0;
2106  //We could use URLProtocol flags here but as many user applications do not use URLProtocols this would be unreliable
2107  const char *proto = avio_find_protocol_name(s->url);
2108 
2109  if (!proto) {
2110  av_log(s, AV_LOG_INFO,
2111  "Protocol name not provided, cannot determine if input is local or "
2112  "a network protocol, buffers and access patterns cannot be configured "
2113  "optimally without knowing the protocol\n");
2114  }
2115 
2116  if (proto && !(strcmp(proto, "file") && strcmp(proto, "pipe") && strcmp(proto, "cache")))
2117  return;
2118 
2119  for (ist1 = 0; ist1 < s->nb_streams; ist1++) {
2120  AVStream *st1 = s->streams[ist1];
2121  for (ist2 = 0; ist2 < s->nb_streams; ist2++) {
2122  AVStream *st2 = s->streams[ist2];
2123  int i1, i2;
2124 
2125  if (ist1 == ist2)
2126  continue;
2127 
2128  for (i1 = i2 = 0; i1 < st1->nb_index_entries; i1++) {
2129  AVIndexEntry *e1 = &st1->index_entries[i1];
2130  int64_t e1_pts = av_rescale_q(e1->timestamp, st1->time_base, AV_TIME_BASE_Q);
2131 
2132  skip = FFMAX(skip, e1->size);
2133  for (; i2 < st2->nb_index_entries; i2++) {
2134  AVIndexEntry *e2 = &st2->index_entries[i2];
2135  int64_t e2_pts = av_rescale_q(e2->timestamp, st2->time_base, AV_TIME_BASE_Q);
2136  if (e2_pts - e1_pts < time_tolerance)
2137  continue;
2138  pos_delta = FFMAX(pos_delta, e1->pos - e2->pos);
2139  break;
2140  }
2141  }
2142  }
2143  }
2144 
2145  pos_delta *= 2;
2146  /* XXX This could be adjusted depending on protocol*/
2147  if (s->pb->buffer_size < pos_delta && pos_delta < (1<<24)) {
2148  av_log(s, AV_LOG_VERBOSE, "Reconfiguring buffers to size %"PRId64"\n", pos_delta);
2149 
2150  /* realloc the buffer and the original data will be retained */
2151  if (ffio_realloc_buf(s->pb, pos_delta)) {
2152  av_log(s, AV_LOG_ERROR, "Realloc buffer fail.\n");
2153  return;
2154  }
2155 
2156  s->pb->short_seek_threshold = FFMAX(s->pb->short_seek_threshold, pos_delta/2);
2157  }
2158 
2159  if (skip < (1<<23)) {
2161  }
2162 }
2163 
2164 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp, int flags)
2165 {
2167  wanted_timestamp, flags);
2168 }
2169 
2170 static int64_t ff_read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit,
2171  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2172 {
2173  int64_t ts = read_timestamp(s, stream_index, ppos, pos_limit);
2174  if (stream_index >= 0)
2175  ts = wrap_timestamp(s->streams[stream_index], ts);
2176  return ts;
2177 }
2178 
2179 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
2180  int64_t target_ts, int flags)
2181 {
2182  const AVInputFormat *avif = s->iformat;
2183  int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;
2184  int64_t ts_min, ts_max, ts;
2185  int index;
2186  int64_t ret;
2187  AVStream *st;
2188 
2189  if (stream_index < 0)
2190  return -1;
2191 
2192  av_log(s, AV_LOG_TRACE, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2193 
2194  ts_max =
2195  ts_min = AV_NOPTS_VALUE;
2196  pos_limit = -1; // GCC falsely says it may be uninitialized.
2197 
2198  st = s->streams[stream_index];
2199  if (st->index_entries) {
2200  AVIndexEntry *e;
2201 
2202  /* FIXME: Whole function must be checked for non-keyframe entries in
2203  * index case, especially read_timestamp(). */
2204  index = av_index_search_timestamp(st, target_ts,
2205  flags | AVSEEK_FLAG_BACKWARD);
2206  index = FFMAX(index, 0);
2207  e = &st->index_entries[index];
2208 
2209  if (e->timestamp <= target_ts || e->pos == e->min_distance) {
2210  pos_min = e->pos;
2211  ts_min = e->timestamp;
2212  av_log(s, AV_LOG_TRACE, "using cached pos_min=0x%"PRIx64" dts_min=%s\n",
2213  pos_min, av_ts2str(ts_min));
2214  } else {
2215  av_assert1(index == 0);
2216  }
2217 
2218  index = av_index_search_timestamp(st, target_ts,
2219  flags & ~AVSEEK_FLAG_BACKWARD);
2220  av_assert0(index < st->nb_index_entries);
2221  if (index >= 0) {
2222  e = &st->index_entries[index];
2223  av_assert1(e->timestamp >= target_ts);
2224  pos_max = e->pos;
2225  ts_max = e->timestamp;
2226  pos_limit = pos_max - e->min_distance;
2227  av_log(s, AV_LOG_TRACE, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64
2228  " dts_max=%s\n", pos_max, pos_limit, av_ts2str(ts_max));
2229  }
2230  }
2231 
2232  pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
2233  ts_min, ts_max, flags, &ts, avif->read_timestamp);
2234  if (pos < 0)
2235  return -1;
2236 
2237  /* do the seek */
2238  if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
2239  return ret;
2240 
2242  ff_update_cur_dts(s, st, ts);
2243 
2244  return 0;
2245 }
2246 
2247 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
2248  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2249 {
2250  int64_t step = 1024;
2251  int64_t limit, ts_max;
2252  int64_t filesize = avio_size(s->pb);
2253  int64_t pos_max = filesize - 1;
2254  do {
2255  limit = pos_max;
2256  pos_max = FFMAX(0, (pos_max) - step);
2257  ts_max = ff_read_timestamp(s, stream_index,
2258  &pos_max, limit, read_timestamp);
2259  step += step;
2260  } while (ts_max == AV_NOPTS_VALUE && 2*limit > step);
2261  if (ts_max == AV_NOPTS_VALUE)
2262  return -1;
2263 
2264  for (;;) {
2265  int64_t tmp_pos = pos_max + 1;
2266  int64_t tmp_ts = ff_read_timestamp(s, stream_index,
2267  &tmp_pos, INT64_MAX, read_timestamp);
2268  if (tmp_ts == AV_NOPTS_VALUE)
2269  break;
2270  av_assert0(tmp_pos > pos_max);
2271  ts_max = tmp_ts;
2272  pos_max = tmp_pos;
2273  if (tmp_pos >= filesize)
2274  break;
2275  }
2276 
2277  if (ts)
2278  *ts = ts_max;
2279  if (pos)
2280  *pos = pos_max;
2281 
2282  return 0;
2283 }
2284 
2285 int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts,
2286  int64_t pos_min, int64_t pos_max, int64_t pos_limit,
2287  int64_t ts_min, int64_t ts_max,
2288  int flags, int64_t *ts_ret,
2289  int64_t (*read_timestamp)(struct AVFormatContext *, int,
2290  int64_t *, int64_t))
2291 {
2292  int64_t pos, ts;
2293  int64_t start_pos;
2294  int no_change;
2295  int ret;
2296 
2297  av_log(s, AV_LOG_TRACE, "gen_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2298 
2299  if (ts_min == AV_NOPTS_VALUE) {
2300  pos_min = s->internal->data_offset;
2301  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2302  if (ts_min == AV_NOPTS_VALUE)
2303  return -1;
2304  }
2305 
2306  if (ts_min >= target_ts) {
2307  *ts_ret = ts_min;
2308  return pos_min;
2309  }
2310 
2311  if (ts_max == AV_NOPTS_VALUE) {
2312  if ((ret = ff_find_last_ts(s, stream_index, &ts_max, &pos_max, read_timestamp)) < 0)
2313  return ret;
2314  pos_limit = pos_max;
2315  }
2316 
2317  if (ts_max <= target_ts) {
2318  *ts_ret = ts_max;
2319  return pos_max;
2320  }
2321 
2322  av_assert0(ts_min < ts_max);
2323 
2324  no_change = 0;
2325  while (pos_min < pos_limit) {
2326  av_log(s, AV_LOG_TRACE,
2327  "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%s dts_max=%s\n",
2328  pos_min, pos_max, av_ts2str(ts_min), av_ts2str(ts_max));
2329  av_assert0(pos_limit <= pos_max);
2330 
2331  if (no_change == 0) {
2332  int64_t approximate_keyframe_distance = pos_max - pos_limit;
2333  // interpolate position (better than dichotomy)
2334  pos = av_rescale(target_ts - ts_min, pos_max - pos_min,
2335  ts_max - ts_min) +
2336  pos_min - approximate_keyframe_distance;
2337  } else if (no_change == 1) {
2338  // bisection if interpolation did not change min / max pos last time
2339  pos = (pos_min + pos_limit) >> 1;
2340  } else {
2341  /* linear search if bisection failed, can only happen if there
2342  * are very few or no keyframes between min/max */
2343  pos = pos_min;
2344  }
2345  if (pos <= pos_min)
2346  pos = pos_min + 1;
2347  else if (pos > pos_limit)
2348  pos = pos_limit;
2349  start_pos = pos;
2350 
2351  // May pass pos_limit instead of -1.
2352  ts = ff_read_timestamp(s, stream_index, &pos, INT64_MAX, read_timestamp);
2353  if (pos == pos_max)
2354  no_change++;
2355  else
2356  no_change = 0;
2357  av_log(s, AV_LOG_TRACE, "%"PRId64" %"PRId64" %"PRId64" / %s %s %s"
2358  " target:%s limit:%"PRId64" start:%"PRId64" noc:%d\n",
2359  pos_min, pos, pos_max,
2360  av_ts2str(ts_min), av_ts2str(ts), av_ts2str(ts_max), av_ts2str(target_ts),
2361  pos_limit, start_pos, no_change);
2362  if (ts == AV_NOPTS_VALUE) {
2363  av_log(s, AV_LOG_ERROR, "read_timestamp() failed in the middle\n");
2364  return -1;
2365  }
2366  if (target_ts <= ts) {
2367  pos_limit = start_pos - 1;
2368  pos_max = pos;
2369  ts_max = ts;
2370  }
2371  if (target_ts >= ts) {
2372  pos_min = pos;
2373  ts_min = ts;
2374  }
2375  }
2376 
2377  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
2378  ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
2379 #if 0
2380  pos_min = pos;
2381  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2382  pos_min++;
2383  ts_max = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2384  av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" %s<=%s<=%s\n",
2385  pos, av_ts2str(ts_min), av_ts2str(target_ts), av_ts2str(ts_max));
2386 #endif
2387  *ts_ret = ts;
2388  return pos;
2389 }
2390 
2391 static int seek_frame_byte(AVFormatContext *s, int stream_index,
2392  int64_t pos, int flags)
2393 {
2394  int64_t pos_min, pos_max;
2395 
2396  pos_min = s->internal->data_offset;
2397  pos_max = avio_size(s->pb) - 1;
2398 
2399  if (pos < pos_min)
2400  pos = pos_min;
2401  else if (pos > pos_max)
2402  pos = pos_max;
2403 
2404  avio_seek(s->pb, pos, SEEK_SET);
2405 
2406  s->io_repositioned = 1;
2407 
2408  return 0;
2409 }
2410 
2411 static int seek_frame_generic(AVFormatContext *s, int stream_index,
2412  int64_t timestamp, int flags)
2413 {
2414  int index;
2415  int64_t ret;
2416  AVStream *st;
2417  AVIndexEntry *ie;
2418 
2419  st = s->streams[stream_index];
2420 
2421  index = av_index_search_timestamp(st, timestamp, flags);
2422 
2423  if (index < 0 && st->nb_index_entries &&
2424  timestamp < st->index_entries[0].timestamp)
2425  return -1;
2426 
2427  if (index < 0 || index == st->nb_index_entries - 1) {
2428  AVPacket pkt;
2429  int nonkey = 0;
2430 
2431  if (st->nb_index_entries) {
2433  ie = &st->index_entries[st->nb_index_entries - 1];
2434  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2435  return ret;
2436  ff_update_cur_dts(s, st, ie->timestamp);
2437  } else {
2438  if ((ret = avio_seek(s->pb, s->internal->data_offset, SEEK_SET)) < 0)
2439  return ret;
2440  }
2441  for (;;) {
2442  int read_status;
2443  do {
2444  read_status = av_read_frame(s, &pkt);
2445  } while (read_status == AVERROR(EAGAIN));
2446  if (read_status < 0)
2447  break;
2448  if (stream_index == pkt.stream_index && pkt.dts > timestamp) {
2449  if (pkt.flags & AV_PKT_FLAG_KEY) {
2450  av_packet_unref(&pkt);
2451  break;
2452  }
2453  if (nonkey++ > 1000 && st->codecpar->codec_id != AV_CODEC_ID_CDGRAPHICS) {
2454  av_log(s, AV_LOG_ERROR,"seek_frame_generic failed as this stream seems to contain no keyframes after the target timestamp, %d non keyframes found\n", nonkey);
2455  av_packet_unref(&pkt);
2456  break;
2457  }
2458  }
2459  av_packet_unref(&pkt);
2460  }
2461  index = av_index_search_timestamp(st, timestamp, flags);
2462  }
2463  if (index < 0)
2464  return -1;
2465 
2467  if (s->iformat->read_seek)
2468  if (s->iformat->read_seek(s, stream_index, timestamp, flags) >= 0)
2469  return 0;
2470  ie = &st->index_entries[index];
2471  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2472  return ret;
2473  ff_update_cur_dts(s, st, ie->timestamp);
2474 
2475  return 0;
2476 }
2477 
2478 static int seek_frame_internal(AVFormatContext *s, int stream_index,
2479  int64_t timestamp, int flags)
2480 {
2481  int ret;
2482  AVStream *st;
2483 
2484  if (flags & AVSEEK_FLAG_BYTE) {
2485  if (s->iformat->flags & AVFMT_NO_BYTE_SEEK)
2486  return -1;
2488  return seek_frame_byte(s, stream_index, timestamp, flags);
2489  }
2490 
2491  if (stream_index < 0) {
2492  stream_index = av_find_default_stream_index(s);
2493  if (stream_index < 0)
2494  return -1;
2495 
2496  st = s->streams[stream_index];
2497  /* timestamp for default must be expressed in AV_TIME_BASE units */
2498  timestamp = av_rescale(timestamp, st->time_base.den,
2499  AV_TIME_BASE * (int64_t) st->time_base.num);
2500  }
2501 
2502  /* first, we try the format specific seek */
2503  if (s->iformat->read_seek) {
2505  ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
2506  } else
2507  ret = -1;
2508  if (ret >= 0)
2509  return 0;
2510 
2511  if (s->iformat->read_timestamp &&
2512  !(s->iformat->flags & AVFMT_NOBINSEARCH)) {
2514  return ff_seek_frame_binary(s, stream_index, timestamp, flags);
2515  } else if (!(s->iformat->flags & AVFMT_NOGENSEARCH)) {
2517  return seek_frame_generic(s, stream_index, timestamp, flags);
2518  } else
2519  return -1;
2520 }
2521 
2522 int av_seek_frame(AVFormatContext *s, int stream_index,
2523  int64_t timestamp, int flags)
2524 {
2525  int ret;
2526 
2527  if (s->iformat->read_seek2 && !s->iformat->read_seek) {
2528  int64_t min_ts = INT64_MIN, max_ts = INT64_MAX;
2529  if ((flags & AVSEEK_FLAG_BACKWARD))
2530  max_ts = timestamp;
2531  else
2532  min_ts = timestamp;
2533  return avformat_seek_file(s, stream_index, min_ts, timestamp, max_ts,
2534  flags & ~AVSEEK_FLAG_BACKWARD);
2535  }
2536 
2537  ret = seek_frame_internal(s, stream_index, timestamp, flags);
2538 
2539  if (ret >= 0)
2541 
2542  return ret;
2543 }
2544 
2545 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
2546  int64_t ts, int64_t max_ts, int flags)
2547 {
2548  if (min_ts > ts || max_ts < ts)
2549  return -1;
2550  if (stream_index < -1 || stream_index >= (int)s->nb_streams)
2551  return AVERROR(EINVAL);
2552 
2553  if (s->seek2any>0)
2554  flags |= AVSEEK_FLAG_ANY;
2555  flags &= ~AVSEEK_FLAG_BACKWARD;
2556 
2557  if (s->iformat->read_seek2) {
2558  int ret;
2560 
2561  if (stream_index == -1 && s->nb_streams == 1) {
2562  AVRational time_base = s->streams[0]->time_base;
2563  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
2564  min_ts = av_rescale_rnd(min_ts, time_base.den,
2565  time_base.num * (int64_t)AV_TIME_BASE,
2567  max_ts = av_rescale_rnd(max_ts, time_base.den,
2568  time_base.num * (int64_t)AV_TIME_BASE,
2570  stream_index = 0;
2571  }
2572 
2573  ret = s->iformat->read_seek2(s, stream_index, min_ts,
2574  ts, max_ts, flags);
2575 
2576  if (ret >= 0)
2578  return ret;
2579  }
2580 
2581  if (s->iformat->read_timestamp) {
2582  // try to seek via read_timestamp()
2583  }
2584 
2585  // Fall back on old API if new is not implemented but old is.
2586  // Note the old API has somewhat different semantics.
2587  if (s->iformat->read_seek || 1) {
2588  int dir = (ts - (uint64_t)min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);
2589  int ret = av_seek_frame(s, stream_index, ts, flags | dir);
2590  if (ret<0 && ts != min_ts && max_ts != ts) {
2591  ret = av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);
2592  if (ret >= 0)
2593  ret = av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));
2594  }
2595  return ret;
2596  }
2597 
2598  // try some generic seek like seek_frame_generic() but with new ts semantics
2599  return -1; //unreachable
2600 }
2601 
2603 {
2605  return 0;
2606 }
2607 
2608 /*******************************************************/
2609 
2610 /**
2611  * Return TRUE if the stream has accurate duration in any stream.
2612  *
2613  * @return TRUE if the stream has accurate duration for at least one component.
2614  */
2616 {
2617  int i;
2618  AVStream *st;
2619 
2620  for (i = 0; i < ic->nb_streams; i++) {
2621  st = ic->streams[i];
2622  if (st->duration != AV_NOPTS_VALUE)
2623  return 1;
2624  }
2625  if (ic->duration != AV_NOPTS_VALUE)
2626  return 1;
2627  return 0;
2628 }
2629 
2630 /**
2631  * Estimate the stream timings from the one of each components.
2632  *
2633  * Also computes the global bitrate if possible.
2634  */
2636 {
2637  int64_t start_time, start_time1, start_time_text, end_time, end_time1, end_time_text;
2638  int64_t duration, duration1, duration_text, filesize;
2639  int i;
2640  AVProgram *p;
2641 
2642  start_time = INT64_MAX;
2643  start_time_text = INT64_MAX;
2644  end_time = INT64_MIN;
2645  end_time_text = INT64_MIN;
2646  duration = INT64_MIN;
2647  duration_text = INT64_MIN;
2648 
2649  for (i = 0; i < ic->nb_streams; i++) {
2650  AVStream *st = ic->streams[i];
2651  int is_text = st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ||
2653  if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
2654  start_time1 = av_rescale_q(st->start_time, st->time_base,
2655  AV_TIME_BASE_Q);
2656  if (is_text)
2657  start_time_text = FFMIN(start_time_text, start_time1);
2658  else
2659  start_time = FFMIN(start_time, start_time1);
2660  end_time1 = av_rescale_q_rnd(st->duration, st->time_base,
2663  if (end_time1 != AV_NOPTS_VALUE && (end_time1 > 0 ? start_time1 <= INT64_MAX - end_time1 : start_time1 >= INT64_MIN - end_time1)) {
2664  end_time1 += start_time1;
2665  if (is_text)
2666  end_time_text = FFMAX(end_time_text, end_time1);
2667  else
2668  end_time = FFMAX(end_time, end_time1);
2669  }
2670  for (p = NULL; (p = av_find_program_from_stream(ic, p, i)); ) {
2671  if (p->start_time == AV_NOPTS_VALUE || p->start_time > start_time1)
2672  p->start_time = start_time1;
2673  if (p->end_time < end_time1)
2674  p->end_time = end_time1;
2675  }
2676  }
2677  if (st->duration != AV_NOPTS_VALUE) {
2678  duration1 = av_rescale_q(st->duration, st->time_base,
2679  AV_TIME_BASE_Q);
2680  if (is_text)
2681  duration_text = FFMAX(duration_text, duration1);
2682  else
2683  duration = FFMAX(duration, duration1);
2684  }
2685  }
2686  if (start_time == INT64_MAX || (start_time > start_time_text && start_time - (uint64_t)start_time_text < AV_TIME_BASE))
2687  start_time = start_time_text;
2688  else if (start_time > start_time_text)
2689  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream starttime %f\n", start_time_text / (float)AV_TIME_BASE);
2690 
2691  if (end_time == INT64_MIN || (end_time < end_time_text && end_time_text - (uint64_t)end_time < AV_TIME_BASE))
2692  end_time = end_time_text;
2693  else if (end_time < end_time_text)
2694  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream endtime %f\n", end_time_text / (float)AV_TIME_BASE);
2695 
2696  if (duration == INT64_MIN || (duration < duration_text && duration_text - duration < AV_TIME_BASE))
2697  duration = duration_text;
2698  else if (duration < duration_text)
2699  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream duration %f\n", duration_text / (float)AV_TIME_BASE);
2700 
2701  if (start_time != INT64_MAX) {
2702  ic->start_time = start_time;
2703  if (end_time != INT64_MIN) {
2704  if (ic->nb_programs > 1) {
2705  for (i = 0; i < ic->nb_programs; i++) {
2706  p = ic->programs[i];
2707  if (p->start_time != AV_NOPTS_VALUE &&
2708  p->end_time > p->start_time &&
2709  p->end_time - (uint64_t)p->start_time <= INT64_MAX)
2710  duration = FFMAX(duration, p->end_time - p->start_time);
2711  }
2712  } else if (end_time >= start_time && end_time - (uint64_t)start_time <= INT64_MAX) {
2713  duration = FFMAX(duration, end_time - start_time);
2714  }
2715  }
2716  }
2717  if (duration != INT64_MIN && duration > 0 && ic->duration == AV_NOPTS_VALUE) {
2718  ic->duration = duration;
2719  }
2720  if (ic->pb && (filesize = avio_size(ic->pb)) > 0 && ic->duration > 0) {
2721  /* compute the bitrate */
2722  double bitrate = (double) filesize * 8.0 * AV_TIME_BASE /
2723  (double) ic->duration;
2724  if (bitrate >= 0 && bitrate <= INT64_MAX)
2725  ic->bit_rate = bitrate;
2726  }
2727 }
2728 
2730 {
2731  int i;
2732  AVStream *st;
2733 
2735  for (i = 0; i < ic->nb_streams; i++) {
2736  st = ic->streams[i];
2737  if (st->start_time == AV_NOPTS_VALUE) {
2738  if (ic->start_time != AV_NOPTS_VALUE)
2740  st->time_base);
2741  if (ic->duration != AV_NOPTS_VALUE)
2743  st->time_base);
2744  }
2745  }
2746 }
2747 
2749 {
2750  int64_t filesize, duration;
2751  int i, show_warning = 0;
2752  AVStream *st;
2753 
2754  /* if bit_rate is already set, we believe it */
2755  if (ic->bit_rate <= 0) {
2756  int64_t bit_rate = 0;
2757  for (i = 0; i < ic->nb_streams; i++) {
2758  st = ic->streams[i];
2759  if (st->codecpar->bit_rate <= 0 && st->internal->avctx->bit_rate > 0)
2760  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
2761  if (st->codecpar->bit_rate > 0) {
2762  if (INT64_MAX - st->codecpar->bit_rate < bit_rate) {
2763  bit_rate = 0;
2764  break;
2765  }
2766  bit_rate += st->codecpar->bit_rate;
2767  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->codec_info_nb_frames > 1) {
2768  // If we have a videostream with packets but without a bitrate
2769  // then consider the sum not known
2770  bit_rate = 0;
2771  break;
2772  }
2773  }
2774  ic->bit_rate = bit_rate;
2775  }
2776 
2777  /* if duration is already set, we believe it */
2778  if (ic->duration == AV_NOPTS_VALUE &&
2779  ic->bit_rate != 0) {
2780  filesize = ic->pb ? avio_size(ic->pb) : 0;
2781  if (filesize > ic->internal->data_offset) {
2782  filesize -= ic->internal->data_offset;
2783  for (i = 0; i < ic->nb_streams; i++) {
2784  st = ic->streams[i];
2785  if ( st->time_base.num <= INT64_MAX / ic->bit_rate
2786  && st->duration == AV_NOPTS_VALUE) {
2787  duration = av_rescale(8 * filesize, st->time_base.den,
2788  ic->bit_rate *
2789  (int64_t) st->time_base.num);
2790  st->duration = duration;
2791  show_warning = 1;
2792  }
2793  }
2794  }
2795  }
2796  if (show_warning)
2797  av_log(ic, AV_LOG_WARNING,
2798  "Estimating duration from bitrate, this may be inaccurate\n");
2799 }
2800 
2801 #define DURATION_MAX_READ_SIZE 250000LL
2802 #define DURATION_MAX_RETRY 6
2803 
2804 /* only usable for MPEG-PS streams */
2805 static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
2806 {
2807  AVPacket pkt1, *pkt = &pkt1;
2808  AVStream *st;
2809  int num, den, read_size, i, ret;
2810  int found_duration = 0;
2811  int is_end;
2812  int64_t filesize, offset, duration;
2813  int retry = 0;
2814 
2815  /* flush packet queue */
2816  flush_packet_queue(ic);
2817 
2818  for (i = 0; i < ic->nb_streams; i++) {
2819  st = ic->streams[i];
2820  if (st->start_time == AV_NOPTS_VALUE &&
2821  st->first_dts == AV_NOPTS_VALUE &&
2823  av_log(ic, AV_LOG_WARNING,
2824  "start time for stream %d is not set in estimate_timings_from_pts\n", i);
2825 
2826  if (st->parser) {
2827  av_parser_close(st->parser);
2828  st->parser = NULL;
2829  }
2830  }
2831 
2833  av_log(ic, AV_LOG_INFO, "Skipping duration calculation in estimate_timings_from_pts\n");
2834  goto skip_duration_calc;
2835  }
2836 
2837  av_opt_set(ic, "skip_changes", "1", AV_OPT_SEARCH_CHILDREN);
2838  /* estimate the end time (duration) */
2839  /* XXX: may need to support wrapping */
2840  filesize = ic->pb ? avio_size(ic->pb) : 0;
2841  do {
2842  is_end = found_duration;
2843  offset = filesize - (DURATION_MAX_READ_SIZE << retry);
2844  if (offset < 0)
2845  offset = 0;
2846 
2847  avio_seek(ic->pb, offset, SEEK_SET);
2848  read_size = 0;
2849  for (;;) {
2850  if (read_size >= DURATION_MAX_READ_SIZE << (FFMAX(retry - 1, 0)))
2851  break;
2852 
2853  do {
2854  ret = ff_read_packet(ic, pkt);
2855  } while (ret == AVERROR(EAGAIN));
2856  if (ret != 0)
2857  break;
2858  read_size += pkt->size;
2859  st = ic->streams[pkt->stream_index];
2860  if (pkt->pts != AV_NOPTS_VALUE &&
2861  (st->start_time != AV_NOPTS_VALUE ||
2862  st->first_dts != AV_NOPTS_VALUE)) {
2863  if (pkt->duration == 0) {
2864  ff_compute_frame_duration(ic, &num, &den, st, st->parser, pkt);
2865  if (den && num) {
2866  pkt->duration = av_rescale_rnd(1,
2867  num * (int64_t) st->time_base.den,
2868  den * (int64_t) st->time_base.num,
2869  AV_ROUND_DOWN);
2870  }
2871  }
2872  duration = pkt->pts + pkt->duration;
2873  found_duration = 1;
2874  if (st->start_time != AV_NOPTS_VALUE)
2875  duration -= st->start_time;
2876  else
2877  duration -= st->first_dts;
2878  if (duration > 0) {
2879  if (st->duration == AV_NOPTS_VALUE || st->info->last_duration<= 0 ||
2880  (st->duration < duration && FFABS(duration - st->info->last_duration) < 60LL*st->time_base.den / st->time_base.num))
2881  st->duration = duration;
2882  st->info->last_duration = duration;
2883  }
2884  }
2885  av_packet_unref(pkt);
2886  }
2887 
2888  /* check if all audio/video streams have valid duration */
2889  if (!is_end) {
2890  is_end = 1;
2891  for (i = 0; i < ic->nb_streams; i++) {
2892  st = ic->streams[i];
2893  switch (st->codecpar->codec_type) {
2894  case AVMEDIA_TYPE_VIDEO:
2895  case AVMEDIA_TYPE_AUDIO:
2896  if (st->duration == AV_NOPTS_VALUE)
2897  is_end = 0;
2898  }
2899  }
2900  }
2901  } while (!is_end &&
2902  offset &&
2903  ++retry <= DURATION_MAX_RETRY);
2904 
2905  av_opt_set(ic, "skip_changes", "0", AV_OPT_SEARCH_CHILDREN);
2906 
2907  /* warn about audio/video streams which duration could not be estimated */
2908  for (i = 0; i < ic->nb_streams; i++) {
2909  st = ic->streams[i];
2910  if (st->duration == AV_NOPTS_VALUE) {
2911  switch (st->codecpar->codec_type) {
2912  case AVMEDIA_TYPE_VIDEO:
2913  case AVMEDIA_TYPE_AUDIO:
2914  if (st->start_time != AV_NOPTS_VALUE || st->first_dts != AV_NOPTS_VALUE) {
2915  av_log(ic, AV_LOG_WARNING, "stream %d : no PTS found at end of file, duration not set\n", i);
2916  } else
2917  av_log(ic, AV_LOG_WARNING, "stream %d : no TS found at start of file, duration not set\n", i);
2918  }
2919  }
2920  }
2921 skip_duration_calc:
2923 
2924  avio_seek(ic->pb, old_offset, SEEK_SET);
2925  for (i = 0; i < ic->nb_streams; i++) {
2926  int j;
2927 
2928  st = ic->streams[i];
2929  st->cur_dts = st->first_dts;
2932  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
2933  st->pts_buffer[j] = AV_NOPTS_VALUE;
2934  }
2935 }
2936 
2937 /* 1:1 map to AVDurationEstimationMethod */
2938 static const char *duration_name[] = {
2939  [AVFMT_DURATION_FROM_PTS] = "pts",
2940  [AVFMT_DURATION_FROM_STREAM] = "stream",
2941  [AVFMT_DURATION_FROM_BITRATE] = "bit rate",
2942 };
2943 
2945 {
2946  return duration_name[method];
2947 }
2948 
2949 static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
2950 {
2951  int64_t file_size;
2952 
2953  /* get the file size, if possible */
2954  if (ic->iformat->flags & AVFMT_NOFILE) {
2955  file_size = 0;
2956  } else {
2957  file_size = avio_size(ic->pb);
2958  file_size = FFMAX(0, file_size);
2959  }
2960 
2961  if ((!strcmp(ic->iformat->name, "mpeg") ||
2962  !strcmp(ic->iformat->name, "mpegts")) &&
2963  file_size && (ic->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
2964  /* get accurate estimate from the PTSes */
2965  estimate_timings_from_pts(ic, old_offset);
2967  } else if (has_duration(ic)) {
2968  /* at least one component has timings - we use them for all
2969  * the components */
2971  /* nut demuxer estimate the duration from PTS */
2972  if(!strcmp(ic->iformat->name, "nut"))
2974  else
2976  } else {
2977  /* less precise: use bitrate info */
2980  }
2982 
2983  {
2984  int i;
2985  AVStream av_unused *st;
2986  for (i = 0; i < ic->nb_streams; i++) {
2987  st = ic->streams[i];
2988  if (st->time_base.den)
2989  av_log(ic, AV_LOG_TRACE, "stream %d: start_time: %0.3f duration: %0.3f\n", i,
2990  (double) st->start_time * av_q2d(st->time_base),
2991  (double) st->duration * av_q2d(st->time_base));
2992  }
2993  av_log(ic, AV_LOG_TRACE,
2994  "format: start_time: %0.3f duration: %0.3f (estimate from %s) bitrate=%"PRId64" kb/s\n",
2995  (double) ic->start_time / AV_TIME_BASE,
2996  (double) ic->duration / AV_TIME_BASE,
2998  (int64_t)ic->bit_rate / 1000);
2999  }
3000 }
3001 
3002 static int has_codec_parameters(AVStream *st, const char **errmsg_ptr)
3003 {
3004  AVCodecContext *avctx = st->internal->avctx;
3005 
3006 #define FAIL(errmsg) do { \
3007  if (errmsg_ptr) \
3008  *errmsg_ptr = errmsg; \
3009  return 0; \
3010  } while (0)
3011 
3012  if ( avctx->codec_id == AV_CODEC_ID_NONE
3013  && avctx->codec_type != AVMEDIA_TYPE_DATA)
3014  FAIL("unknown codec");
3015  switch (avctx->codec_type) {
3016  case AVMEDIA_TYPE_AUDIO:
3017  if (!avctx->frame_size && determinable_frame_size(avctx))
3018  FAIL("unspecified frame size");
3019  if (st->info->found_decoder >= 0 &&
3020  avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
3021  FAIL("unspecified sample format");
3022  if (!avctx->sample_rate)
3023  FAIL("unspecified sample rate");
3024  if (!avctx->channels)
3025  FAIL("unspecified number of channels");
3026  if (st->info->found_decoder >= 0 && !st->nb_decoded_frames && avctx->codec_id == AV_CODEC_ID_DTS)
3027  FAIL("no decodable DTS frames");
3028  break;
3029  case AVMEDIA_TYPE_VIDEO:
3030  if (!avctx->width)
3031  FAIL("unspecified size");
3032  if (st->info->found_decoder >= 0 && avctx->pix_fmt == AV_PIX_FMT_NONE)
3033  FAIL("unspecified pixel format");
3036  FAIL("no frame in rv30/40 and no sar");
3037  break;
3038  case AVMEDIA_TYPE_SUBTITLE:
3039  if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
3040  FAIL("unspecified size");
3041  break;
3042  case AVMEDIA_TYPE_DATA:
3043  if (avctx->codec_id == AV_CODEC_ID_NONE) return 1;
3044  }
3045 
3046  return 1;
3047 }
3048 
3049 /* returns 1 or 0 if or if not decoded data was returned, or a negative error */
3051  const AVPacket *avpkt, AVDictionary **options)
3052 {
3053  AVCodecContext *avctx = st->internal->avctx;
3054  const AVCodec *codec;
3055  int got_picture = 1, ret = 0;
3057  AVSubtitle subtitle;
3058  AVPacket pkt = *avpkt;
3059  int do_skip_frame = 0;
3060  enum AVDiscard skip_frame;
3061 
3062  if (!frame)
3063  return AVERROR(ENOMEM);
3064 
3065  if (!avcodec_is_open(avctx) &&
3066  st->info->found_decoder <= 0 &&
3067  (st->codecpar->codec_id != -st->info->found_decoder || !st->codecpar->codec_id)) {
3068  AVDictionary *thread_opt = NULL;
3069 
3070  codec = find_probe_decoder(s, st, st->codecpar->codec_id);
3071 
3072  if (!codec) {
3073  st->info->found_decoder = -st->codecpar->codec_id;
3074  ret = -1;
3075  goto fail;
3076  }
3077 
3078  /* Force thread count to 1 since the H.264 decoder will not extract
3079  * SPS and PPS to extradata during multi-threaded decoding. */
3080  av_dict_set(options ? options : &thread_opt, "threads", "1", 0);
3081  if (s->codec_whitelist)
3082  av_dict_set(options ? options : &thread_opt, "codec_whitelist", s->codec_whitelist, 0);
3083  ret = avcodec_open2(avctx, codec, options ? options : &thread_opt);
3084  if (!options)
3085  av_dict_free(&thread_opt);
3086  if (ret < 0) {
3087  st->info->found_decoder = -avctx->codec_id;
3088  goto fail;
3089  }
3090  st->info->found_decoder = 1;
3091  } else if (!st->info->found_decoder)
3092  st->info->found_decoder = 1;
3093 
3094  if (st->info->found_decoder < 0) {
3095  ret = -1;
3096  goto fail;
3097  }
3098 
3100  do_skip_frame = 1;
3101  skip_frame = avctx->skip_frame;
3102  avctx->skip_frame = AVDISCARD_ALL;
3103  }
3104 
3105  while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
3106  ret >= 0 &&
3108  (!st->codec_info_nb_frames &&
3110  got_picture = 0;
3111  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
3112  avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
3113  ret = avcodec_send_packet(avctx, &pkt);
3114  if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3115  break;
3116  if (ret >= 0)
3117  pkt.size = 0;
3118  ret = avcodec_receive_frame(avctx, frame);
3119  if (ret >= 0)
3120  got_picture = 1;
3121  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
3122  ret = 0;
3123  } else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
3124  ret = avcodec_decode_subtitle2(avctx, &subtitle,
3125  &got_picture, &pkt);
3126  if (ret >= 0)
3127  pkt.size = 0;
3128  }
3129  if (ret >= 0) {
3130  if (got_picture)
3131  st->nb_decoded_frames++;
3132  ret = got_picture;
3133  }
3134  }
3135 
3136  if (!pkt.data && !got_picture)
3137  ret = -1;
3138 
3139 fail:
3140  if (do_skip_frame) {
3141  avctx->skip_frame = skip_frame;
3142  }
3143 
3144  av_frame_free(&frame);
3145  return ret;
3146 }
3147 
3148 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
3149 {
3150  while (tags->id != AV_CODEC_ID_NONE) {
3151  if (tags->id == id)
3152  return tags->tag;
3153  tags++;
3154  }
3155  return 0;
3156 }
3157 
3158 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
3159 {
3160  int i;
3161  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3162  if (tag == tags[i].tag)
3163  return tags[i].id;
3164  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3165  if (avpriv_toupper4(tag) == avpriv_toupper4(tags[i].tag))
3166  return tags[i].id;
3167  return AV_CODEC_ID_NONE;
3168 }
3169 
3170 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
3171 {
3172  if (bps <= 0 || bps > 64)
3173  return AV_CODEC_ID_NONE;
3174 
3175  if (flt) {
3176  switch (bps) {
3177  case 32:
3179  case 64:
3181  default:
3182  return AV_CODEC_ID_NONE;
3183  }
3184  } else {
3185  bps += 7;
3186  bps >>= 3;
3187  if (sflags & (1 << (bps - 1))) {
3188  switch (bps) {
3189  case 1:
3190  return AV_CODEC_ID_PCM_S8;
3191  case 2:
3193  case 3:
3195  case 4:
3197  case 8:
3199  default:
3200  return AV_CODEC_ID_NONE;
3201  }
3202  } else {
3203  switch (bps) {
3204  case 1:
3205  return AV_CODEC_ID_PCM_U8;
3206  case 2:
3208  case 3:
3210  case 4:
3212  default:
3213  return AV_CODEC_ID_NONE;
3214  }
3215  }
3216  }
3217 }
3218 
3219 unsigned int av_codec_get_tag(const AVCodecTag *const *tags, enum AVCodecID id)
3220 {
3221  unsigned int tag;
3222  if (!av_codec_get_tag2(tags, id, &tag))
3223  return 0;
3224  return tag;
3225 }
3226 
3227 int av_codec_get_tag2(const AVCodecTag * const *tags, enum AVCodecID id,
3228  unsigned int *tag)
3229 {
3230  int i;
3231  for (i = 0; tags && tags[i]; i++) {
3232  const AVCodecTag *codec_tags = tags[i];
3233  while (codec_tags->id != AV_CODEC_ID_NONE) {
3234  if (codec_tags->id == id) {
3235  *tag = codec_tags->tag;
3236  return 1;
3237  }
3238  codec_tags++;
3239  }
3240  }
3241  return 0;
3242 }
3243 
3244 enum AVCodecID av_codec_get_id(const AVCodecTag *const *tags, unsigned int tag)
3245 {
3246  int i;
3247  for (i = 0; tags && tags[i]; i++) {
3248  enum AVCodecID id = ff_codec_get_id(tags[i], tag);
3249  if (id != AV_CODEC_ID_NONE)
3250  return id;
3251  }
3252  return AV_CODEC_ID_NONE;
3253 }
3254 
3256 {
3257  unsigned int i, j;
3258  int64_t max_time = 0;
3259 
3260  if (s->duration > 0 && s->start_time < INT64_MAX - s->duration)
3261  max_time = s->duration +
3262  ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
3263 
3264  for (i = 0; i < s->nb_chapters; i++)
3265  if (s->chapters[i]->end == AV_NOPTS_VALUE) {
3266  AVChapter *ch = s->chapters[i];
3267  int64_t end = max_time ? av_rescale_q(max_time, AV_TIME_BASE_Q,
3268  ch->time_base)
3269  : INT64_MAX;
3270 
3271  for (j = 0; j < s->nb_chapters; j++) {
3272  AVChapter *ch1 = s->chapters[j];
3273  int64_t next_start = av_rescale_q(ch1->start, ch1->time_base,
3274  ch->time_base);
3275  if (j != i && next_start > ch->start && next_start < end)
3276  end = next_start;
3277  }
3278  ch->end = (end == INT64_MAX || end < ch->start) ? ch->start : end;
3279  }
3280 }
3281 
3282 static int get_std_framerate(int i)
3283 {
3284  if (i < 30*12)
3285  return (i + 1) * 1001;
3286  i -= 30*12;
3287 
3288  if (i < 30)
3289  return (i + 31) * 1001 * 12;
3290  i -= 30;
3291 
3292  if (i < 3)
3293  return ((const int[]) { 80, 120, 240})[i] * 1001 * 12;
3294 
3295  i -= 3;
3296 
3297  return ((const int[]) { 24, 30, 60, 12, 15, 48 })[i] * 1000 * 12;
3298 }
3299 
3300 /* Is the time base unreliable?
3301  * This is a heuristic to balance between quick acceptance of the values in
3302  * the headers vs. some extra checks.
3303  * Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
3304  * MPEG-2 commonly misuses field repeat flags to store different framerates.
3305  * And there are "variable" fps files this needs to detect as well. */
3307 {
3308  if (c->time_base.den >= 101LL * c->time_base.num ||
3309  c->time_base.den < 5LL * c->time_base.num ||
3310  // c->codec_tag == AV_RL32("DIVX") ||
3311  // c->codec_tag == AV_RL32("XVID") ||
3312  c->codec_tag == AV_RL32("mp4v") ||
3314  c->codec_id == AV_CODEC_ID_GIF ||
3315  c->codec_id == AV_CODEC_ID_HEVC ||
3316  c->codec_id == AV_CODEC_ID_H264)
3317  return 1;
3318  return 0;
3319 }
3320 
3322 {
3323  av_freep(&par->extradata);
3324  par->extradata_size = 0;
3325 
3327  return AVERROR(EINVAL);
3328 
3330  if (!par->extradata)
3331  return AVERROR(ENOMEM);
3332 
3333  memset(par->extradata + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3334  par->extradata_size = size;
3335 
3336  return 0;
3337 }
3338 
3340 {
3341  int ret = ff_alloc_extradata(par, size);
3342  if (ret < 0)
3343  return ret;
3344  ret = avio_read(pb, par->extradata, size);
3345  if (ret != size) {
3346  av_freep(&par->extradata);
3347  par->extradata_size = 0;
3348  av_log(s, AV_LOG_ERROR, "Failed to read extradata of size %d\n", size);
3349  return ret < 0 ? ret : AVERROR_INVALIDDATA;
3350  }
3351 
3352  return ret;
3353 }
3354 
3355 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
3356 {
3357  int i, j;
3358  int64_t last = st->info->last_dts;
3359 
3360  if ( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
3361  && ts - (uint64_t)last < INT64_MAX) {
3362  double dts = (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
3363  int64_t duration = ts - last;
3364 
3365  if (!st->info->duration_error)
3366  st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
3367  if (!st->info->duration_error)
3368  return AVERROR(ENOMEM);
3369 
3370 // if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
3371 // av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
3372  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3373  if (st->info->duration_error[0][1][i] < 1e10) {
3374  int framerate = get_std_framerate(i);
3375  double sdts = dts*framerate/(1001*12);
3376  for (j= 0; j<2; j++) {
3377  int64_t ticks = llrint(sdts+j*0.5);
3378  double error= sdts - ticks + j*0.5;
3379  st->info->duration_error[j][0][i] += error;
3380  st->info->duration_error[j][1][i] += error*error;
3381  }
3382  }
3383  }
3384  if (st->info->rfps_duration_sum <= INT64_MAX - duration) {
3385  st->info->duration_count++;
3387  }
3388 
3389  if (st->info->duration_count % 10 == 0) {
3390  int n = st->info->duration_count;
3391  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3392  if (st->info->duration_error[0][1][i] < 1e10) {
3393  double a0 = st->info->duration_error[0][0][i] / n;
3394  double error0 = st->info->duration_error[0][1][i] / n - a0*a0;
3395  double a1 = st->info->duration_error[1][0][i] / n;
3396  double error1 = st->info->duration_error[1][1][i] / n - a1*a1;
3397  if (error0 > 0.04 && error1 > 0.04) {
3398  st->info->duration_error[0][1][i] = 2e10;
3399  st->info->duration_error[1][1][i] = 2e10;
3400  }
3401  }
3402  }
3403  }
3404 
3405  // ignore the first 4 values, they might have some random jitter
3406  if (st->info->duration_count > 3 && is_relative(ts) == is_relative(last))
3407  st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
3408  }
3409  if (ts != AV_NOPTS_VALUE)
3410  st->info->last_dts = ts;
3411 
3412  return 0;
3413 }
3414 
3416 {
3417  int i, j;
3418 
3419  for (i = 0; i < ic->nb_streams; i++) {
3420  AVStream *st = ic->streams[i];
3421 
3423  continue;
3424  // the check for tb_unreliable() is not completely correct, since this is not about handling
3425  // an unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
3426  // ipmovie.c produces.
3427  if (tb_unreliable(st->internal->avctx) && st->info->duration_count > 15 && st->info->duration_gcd > FFMAX(1, st->time_base.den/(500LL*st->time_base.num)) && !st->r_frame_rate.num)
3428  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, st->time_base.den, st->time_base.num * st->info->duration_gcd, INT_MAX);
3429  if (st->info->duration_count>1 && !st->r_frame_rate.num
3430  && tb_unreliable(st->internal->avctx)) {
3431  int num = 0;
3432  double best_error= 0.01;
3433  AVRational ref_rate = st->r_frame_rate.num ? st->r_frame_rate : av_inv_q(st->time_base);
3434 
3435  for (j= 0; j<MAX_STD_TIMEBASES; j++) {
3436  int k;
3437 
3438  if (st->info->codec_info_duration &&
3439  st->info->codec_info_duration*av_q2d(st->time_base) < (1001*11.5)/get_std_framerate(j))
3440  continue;
3441  if (!st->info->codec_info_duration && get_std_framerate(j) < 1001*12)
3442  continue;
3443 
3444  if (av_q2d(st->time_base) * st->info->rfps_duration_sum / st->info->duration_count < (1001*12.0 * 0.8)/get_std_framerate(j))
3445  continue;
3446 
3447  for (k= 0; k<2; k++) {
3448  int n = st->info->duration_count;
3449  double a= st->info->duration_error[k][0][j] / n;
3450  double error= st->info->duration_error[k][1][j]/n - a*a;
3451 
3452  if (error < best_error && best_error> 0.000000001) {
3453  best_error= error;
3454  num = get_std_framerate(j);
3455  }
3456  if (error < 0.02)
3457  av_log(ic, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
3458  }
3459  }
3460  // do not increase frame rate by more than 1 % in order to match a standard rate.
3461  if (num && (!ref_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(ref_rate)))
3462  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
3463  }
3464  if ( !st->avg_frame_rate.num
3465  && st->r_frame_rate.num && st->info->rfps_duration_sum
3466  && st->info->codec_info_duration <= 0
3467  && st->info->duration_count > 2
3468  && fabs(1.0 / (av_q2d(st->r_frame_rate) * av_q2d(st->time_base)) - st->info->rfps_duration_sum / (double)st->info->duration_count) <= 1.0
3469  ) {
3470  av_log(ic, AV_LOG_DEBUG, "Setting avg frame rate based on r frame rate\n");
3471  st->avg_frame_rate = st->r_frame_rate;
3472  }
3473 
3474  av_freep(&st->info->duration_error);
3475  st->info->last_dts = AV_NOPTS_VALUE;
3476  st->info->duration_count = 0;
3477  st->info->rfps_duration_sum = 0;
3478  }
3479 }
3480 
3482 {
3483  const AVBitStreamFilter *f;
3484 
3485  f = av_bsf_get_by_name("extract_extradata");
3486  if (!f)
3487  return 0;
3488 
3489  if (f->codec_ids) {
3490  const enum AVCodecID *ids;
3491  for (ids = f->codec_ids; *ids != AV_CODEC_ID_NONE; ids++)
3492  if (*ids == st->codecpar->codec_id)
3493  return 1;
3494  }
3495 
3496  return 0;
3497 }
3498 
3500 {
3501  AVStreamInternal *sti = st->internal;
3502  const AVBitStreamFilter *f;
3503  int ret;
3504 
3505  f = av_bsf_get_by_name("extract_extradata");
3506  if (!f)
3507  goto finish;
3508 
3509  /* check that the codec id is supported */
3510  ret = extract_extradata_check(st);
3511  if (!ret)
3512  goto finish;
3513 
3515  if (!sti->extract_extradata.pkt)
3516  return AVERROR(ENOMEM);
3517 
3518  ret = av_bsf_alloc(f, &sti->extract_extradata.bsf);
3519  if (ret < 0)
3520  goto fail;
3521 
3523  st->codecpar);
3524  if (ret < 0)
3525  goto fail;
3526 
3528 
3529  ret = av_bsf_init(sti->extract_extradata.bsf);
3530  if (ret < 0)
3531  goto fail;
3532 
3533 finish:
3534  sti->extract_extradata.inited = 1;
3535 
3536  return 0;
3537 fail:
3540  return ret;
3541 }
3542 
3543 static int extract_extradata(AVStream *st, const AVPacket *pkt)
3544 {
3545  AVStreamInternal *sti = st->internal;
3546  AVPacket *pkt_ref;
3547  int ret;
3548 
3549  if (!sti->extract_extradata.inited) {
3550  ret = extract_extradata_init(st);
3551  if (ret < 0)
3552  return ret;
3553  }
3554 
3555  if (sti->extract_extradata.inited && !sti->extract_extradata.bsf)
3556  return 0;
3557 
3558  pkt_ref = sti->extract_extradata.pkt;
3559  ret = av_packet_ref(pkt_ref, pkt);
3560  if (ret < 0)
3561  return ret;
3562 
3563  ret = av_bsf_send_packet(sti->extract_extradata.bsf, pkt_ref);
3564  if (ret < 0) {
3565  av_packet_unref(pkt_ref);
3566  return ret;
3567  }
3568 
3569  while (ret >= 0 && !sti->avctx->extradata) {
3570  int extradata_size;
3571  uint8_t *extradata;
3572 
3573  ret = av_bsf_receive_packet(sti->extract_extradata.bsf, pkt_ref);
3574  if (ret < 0) {
3575  if (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3576  return ret;
3577  continue;
3578  }
3579 
3581  &extradata_size);
3582 
3583  if (extradata) {
3584  av_assert0(!sti->avctx->extradata);
3585  if ((unsigned)extradata_size < FF_MAX_EXTRADATA_SIZE)
3586  sti->avctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
3587  if (!sti->avctx->extradata) {
3588  av_packet_unref(pkt_ref);
3589  return AVERROR(ENOMEM);
3590  }
3591  memcpy(sti->avctx->extradata, extradata, extradata_size);
3592  sti->avctx->extradata_size = extradata_size;
3593  }
3594  av_packet_unref(pkt_ref);
3595  }
3596 
3597  return 0;
3598 }
3599 
3601 {
3602  int i, count = 0, ret = 0, j;
3603  int64_t read_size;
3604  AVStream *st;
3605  AVCodecContext *avctx;
3606  AVPacket pkt1;
3607  int64_t old_offset = avio_tell(ic->pb);
3608  // new streams might appear, no options for those
3609  int orig_nb_streams = ic->nb_streams;
3610  int flush_codecs;
3611  int64_t max_analyze_duration = ic->max_analyze_duration;
3612  int64_t max_stream_analyze_duration;
3613  int64_t max_subtitle_analyze_duration;
3614  int64_t probesize = ic->probesize;
3615  int eof_reached = 0;
3616  int *missing_streams = av_opt_ptr(ic->iformat->priv_class, ic->priv_data, "missing_streams");
3617 
3618  flush_codecs = probesize > 0;
3619 
3620  av_opt_set(ic, "skip_clear", "1", AV_OPT_SEARCH_CHILDREN);
3621 
3622  max_stream_analyze_duration = max_analyze_duration;
3623  max_subtitle_analyze_duration = max_analyze_duration;
3624  if (!max_analyze_duration) {
3625  max_stream_analyze_duration =
3626  max_analyze_duration = 5*AV_TIME_BASE;
3627  max_subtitle_analyze_duration = 30*AV_TIME_BASE;
3628  if (!strcmp(ic->iformat->name, "flv"))
3629  max_stream_analyze_duration = 90*AV_TIME_BASE;
3630  if (!strcmp(ic->iformat->name, "mpeg") || !strcmp(ic->iformat->name, "mpegts"))
3631  max_stream_analyze_duration = 7*AV_TIME_BASE;
3632  }
3633 
3634  if (ic->pb)
3635  av_log(ic, AV_LOG_DEBUG, "Before avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d nb_streams:%d\n",
3636  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, ic->nb_streams);
3637 
3638  for (i = 0; i < ic->nb_streams; i++) {
3639  const AVCodec *codec;
3640  AVDictionary *thread_opt = NULL;
3641  st = ic->streams[i];
3642  avctx = st->internal->avctx;
3643 
3644  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
3646 /* if (!st->time_base.num)
3647  st->time_base = */
3648  if (!avctx->time_base.num)
3649  avctx->time_base = st->time_base;
3650  }
3651 
3652  /* check if the caller has overridden the codec id */
3653 #if FF_API_LAVF_AVCTX
3655  if (st->codec->codec_id != st->internal->orig_codec_id) {
3656  st->codecpar->codec_id = st->codec->codec_id;
3657  st->codecpar->codec_type = st->codec->codec_type;
3658  st->internal->orig_codec_id = st->codec->codec_id;
3659  }
3661 #endif
3662  // only for the split stuff
3663  if (!st->parser && !(ic->flags & AVFMT_FLAG_NOPARSE) && st->request_probe <= 0) {
3664  st->parser = av_parser_init(st->codecpar->codec_id);
3665  if (st->parser) {
3666  if (st->need_parsing == AVSTREAM_PARSE_HEADERS) {
3668  } else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW) {
3670  }
3671  } else if (st->need_parsing) {
3672  av_log(ic, AV_LOG_VERBOSE, "parser not found for codec "
3673  "%s, packets or times may be invalid.\n",
3675  }
3676  }
3677 
3678  if (st->codecpar->codec_id != st->internal->orig_codec_id)
3680 
3682  if (ret < 0)
3683  goto find_stream_info_err;
3684  if (st->request_probe <= 0)
3685  st->internal->avctx_inited = 1;
3686 
3687  codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3688 
3689  /* Force thread count to 1 since the H.264 decoder will not extract
3690  * SPS and PPS to extradata during multi-threaded decoding. */
3691  av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
3692 
3693  if (ic->codec_whitelist)
3694  av_dict_set(options ? &options[i] : &thread_opt, "codec_whitelist", ic->codec_whitelist, 0);
3695 
3696  /* Ensure that subtitle_header is properly set. */
3698  && codec && !avctx->codec) {
3699  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3700  av_log(ic, AV_LOG_WARNING,
3701  "Failed to open codec in %s\n",__FUNCTION__);
3702  }
3703 
3704  // Try to just open decoders, in case this is enough to get parameters.
3705  if (!has_codec_parameters(st, NULL) && st->request_probe <= 0) {
3706  if (codec && !avctx->codec)
3707  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3708  av_log(ic, AV_LOG_WARNING,
3709  "Failed to open codec in %s\n",__FUNCTION__);
3710  }
3711  if (!options)
3712  av_dict_free(&thread_opt);
3713  }
3714 
3715  for (i = 0; i < ic->nb_streams; i++) {
3716 #if FF_API_R_FRAME_RATE
3718 #endif
3721  }
3722 
3723  read_size = 0;
3724  for (;;) {
3725  const AVPacket *pkt;
3726  int analyzed_all_streams;
3728  ret = AVERROR_EXIT;
3729  av_log(ic, AV_LOG_DEBUG, "interrupted\n");
3730  break;
3731  }
3732 
3733  /* check if one codec still needs to be handled */
3734  for (i = 0; i < ic->nb_streams; i++) {
3735  int fps_analyze_framecount = 20;
3736  int count;
3737 
3738  st = ic->streams[i];
3739  if (!has_codec_parameters(st, NULL))
3740  break;
3741  /* If the timebase is coarse (like the usual millisecond precision
3742  * of mkv), we need to analyze more frames to reliably arrive at
3743  * the correct fps. */
3744  if (av_q2d(st->time_base) > 0.0005)
3745  fps_analyze_framecount *= 2;
3746  if (!tb_unreliable(st->internal->avctx))
3747  fps_analyze_framecount = 0;
3748  if (ic->fps_probe_size >= 0)
3749  fps_analyze_framecount = ic->fps_probe_size;
3751  fps_analyze_framecount = 0;
3752  /* variable fps and no guess at the real fps */
3753  count = (ic->iformat->flags & AVFMT_NOTIMESTAMPS) ?
3755  st->info->duration_count;
3756  if (!(st->r_frame_rate.num && st->avg_frame_rate.num) &&
3758  if (count < fps_analyze_framecount)
3759  break;
3760  }
3761  // Look at the first 3 frames if there is evidence of frame delay
3762  // but the decoder delay is not set.
3763  if (st->info->frame_delay_evidence && count < 2 && st->internal->avctx->has_b_frames == 0)
3764  break;
3765  if (!st->internal->avctx->extradata &&
3767  st->internal->extract_extradata.bsf) &&
3769  break;
3770  if (st->first_dts == AV_NOPTS_VALUE &&
3771  !(ic->iformat->flags & AVFMT_NOTIMESTAMPS) &&
3775  break;
3776  }
3777  analyzed_all_streams = 0;
3778  if (!missing_streams || !*missing_streams)
3779  if (i == ic->nb_streams) {
3780  analyzed_all_streams = 1;
3781  /* NOTE: If the format has no header, then we need to read some
3782  * packets to get most of the streams, so we cannot stop here. */
3783  if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
3784  /* If we found the info for all the codecs, we can stop. */
3785  ret = count;
3786  av_log(ic, AV_LOG_DEBUG, "All info found\n");
3787  flush_codecs = 0;
3788  break;
3789  }
3790  }
3791  /* We did not get all the codec info, but we read too much data. */
3792  if (read_size >= probesize) {
3793  ret = count;
3794  av_log(ic, AV_LOG_DEBUG,
3795  "Probe buffer size limit of %"PRId64" bytes reached\n", probesize);
3796  for (i = 0; i < ic->nb_streams; i++)
3797  if (!ic->streams[i]->r_frame_rate.num &&
3798  ic->streams[i]->info->duration_count <= 1 &&
3800  strcmp(ic->iformat->name, "image2"))
3801  av_log(ic, AV_LOG_WARNING,
3802  "Stream #%d: not enough frames to estimate rate; "
3803  "consider increasing probesize\n", i);
3804  break;
3805  }
3806 
3807  /* NOTE: A new stream can be added there if no header in file
3808  * (AVFMTCTX_NOHEADER). */
3809  ret = read_frame_internal(ic, &pkt1);
3810  if (ret == AVERROR(EAGAIN))
3811  continue;
3812 
3813  if (ret < 0) {
3814  /* EOF or error*/
3815  eof_reached = 1;
3816  break;
3817  }
3818 
3819  if (!(ic->flags & AVFMT_FLAG_NOBUFFER)) {
3822  &pkt1, 0);
3823  if (ret < 0)
3824  goto unref_then_goto_end;
3825 
3826  pkt = &ic->internal->packet_buffer_end->pkt;
3827  } else {
3828  pkt = &pkt1;
3829  }
3830 
3831  st = ic->streams[pkt->stream_index];
3833  read_size += pkt->size;
3834 
3835  avctx = st->internal->avctx;
3836  if (!st->internal->avctx_inited) {
3838  if (ret < 0)
3839  goto unref_then_goto_end;
3840  st->internal->avctx_inited = 1;
3841  }
3842 
3843  if (pkt->dts != AV_NOPTS_VALUE && st->codec_info_nb_frames > 1) {
3844  /* check for non-increasing dts */
3845  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3846  st->info->fps_last_dts >= pkt->dts) {
3847  av_log(ic, AV_LOG_DEBUG,
3848  "Non-increasing DTS in stream %d: packet %d with DTS "
3849  "%"PRId64", packet %d with DTS %"PRId64"\n",
3850  st->index, st->info->fps_last_dts_idx,
3852  pkt->dts);
3853  st->info->fps_first_dts =
3855  }
3856  /* Check for a discontinuity in dts. If the difference in dts
3857  * is more than 1000 times the average packet duration in the
3858  * sequence, we treat it as a discontinuity. */
3859  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3861  (pkt->dts - (uint64_t)st->info->fps_last_dts) / 1000 >
3862  (st->info->fps_last_dts - (uint64_t)st->info->fps_first_dts) /
3863  (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
3864  av_log(ic, AV_LOG_WARNING,
3865  "DTS discontinuity in stream %d: packet %d with DTS "
3866  "%"PRId64", packet %d with DTS %"PRId64"\n",
3867  st->index, st->info->fps_last_dts_idx,
3869  pkt->dts);
3870  st->info->fps_first_dts =
3872  }
3873 
3874  /* update stored dts values */
3875  if (st->info->fps_first_dts == AV_NOPTS_VALUE) {
3876  st->info->fps_first_dts = pkt->dts;
3878  }
3879  st->info->fps_last_dts = pkt->dts;
3881  }
3882  if (st->codec_info_nb_frames>1) {
3883  int64_t t = 0;
3884  int64_t limit;
3885 
3886  if (st->time_base.den > 0)
3888  if (st->avg_frame_rate.num > 0)
3890 
3891  if ( t == 0
3892  && st->codec_info_nb_frames>30
3893  && st->info->fps_first_dts != AV_NOPTS_VALUE
3894  && st->info->fps_last_dts != AV_NOPTS_VALUE)
3896 
3897  if (analyzed_all_streams) limit = max_analyze_duration;
3898  else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) limit = max_subtitle_analyze_duration;
3899  else limit = max_stream_analyze_duration;
3900 
3901  if (t >= limit) {
3902  av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds st:%d\n",
3903  limit,
3904  t, pkt->stream_index);
3905  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3906  av_packet_unref(&pkt1);
3907  break;
3908  }
3909  if (pkt->duration) {
3910  if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE && pkt->pts != AV_NOPTS_VALUE && st->start_time != AV_NOPTS_VALUE && pkt->pts >= st->start_time) {
3911  st->info->codec_info_duration = FFMIN(pkt->pts - st->start_time, st->info->codec_info_duration + pkt->duration);
3912  } else
3913  st->info->codec_info_duration += pkt->duration;
3914  st->info->codec_info_duration_fields += st->parser && st->need_parsing && avctx->ticks_per_frame ==2 ? st->parser->repeat_pict + 1 : 2;
3915  }
3916  }
3917  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
3918 #if FF_API_R_FRAME_RATE
3919  ff_rfps_add_frame(ic, st, pkt->dts);
3920 #endif
3921  if (pkt->dts != pkt->pts && pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE)
3922  st->info->frame_delay_evidence = 1;
3923  }
3924  if (!st->internal->avctx->extradata) {
3925  ret = extract_extradata(st, pkt);
3926  if (ret < 0)
3927  goto unref_then_goto_end;
3928  }
3929 
3930  /* If still no information, we try to open the codec and to
3931  * decompress the frame. We try to avoid that in most cases as
3932  * it takes longer and uses more memory. For MPEG-4, we need to
3933  * decompress for QuickTime.
3934  *
3935  * If AV_CODEC_CAP_CHANNEL_CONF is set this will force decoding of at
3936  * least one frame of codec data, this makes sure the codec initializes
3937  * the channel configuration and does not only trust the values from
3938  * the container. */
3939  try_decode_frame(ic, st, pkt,
3940  (options && i < orig_nb_streams) ? &options[i] : NULL);
3941 
3942  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3943  av_packet_unref(&pkt1);
3944 
3945  st->codec_info_nb_frames++;
3946  count++;
3947  }
3948 
3949  if (eof_reached) {
3950  int stream_index;
3951  for (stream_index = 0; stream_index < ic->nb_streams; stream_index++) {
3952  st = ic->streams[stream_index];
3953  avctx = st->internal->avctx;
3954  if (!has_codec_parameters(st, NULL)) {
3955  const AVCodec *codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3956  if (codec && !avctx->codec) {
3957  AVDictionary *opts = NULL;
3958  if (ic->codec_whitelist)
3959  av_dict_set(&opts, "codec_whitelist", ic->codec_whitelist, 0);
3960  if (avcodec_open2(avctx, codec, (options && stream_index < orig_nb_streams) ? &options[stream_index] : &opts) < 0)
3961  av_log(ic, AV_LOG_WARNING,
3962  "Failed to open codec in %s\n",__FUNCTION__);
3963  av_dict_free(&opts);
3964  }
3965  }
3966 
3967  // EOF already reached while reading the stream above.
3968  // So continue with reoordering DTS with whatever delay we have.
3970  update_dts_from_pts(ic, stream_index, ic->internal->packet_buffer);
3971  }
3972  }
3973  }
3974 
3975  if (flush_codecs) {
3976  AVPacket empty_pkt = { 0 };
3977  int err = 0;
3978  av_init_packet(&empty_pkt);
3979 
3980  for (i = 0; i < ic->nb_streams; i++) {
3981 
3982  st = ic->streams[i];
3983 
3984  /* flush the decoders */
3985  if (st->info->found_decoder == 1) {
3986  do {
3987  err = try_decode_frame(ic, st, &empty_pkt,
3988  (options && i < orig_nb_streams)
3989  ? &options[i] : NULL);
3990  } while (err > 0 && !has_codec_parameters(st, NULL));
3991 
3992  if (err < 0) {
3993  av_log(ic, AV_LOG_INFO,
3994  "decoding for stream %d failed\n", st->index);
3995  }
3996  }
3997  }
3998  }
3999 
4000  ff_rfps_calculate(ic);
4001 
4002  for (i = 0; i < ic->nb_streams; i++) {
4003  st = ic->streams[i];
4004  avctx = st->internal->avctx;
4005  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
4006  if (avctx->codec_id == AV_CODEC_ID_RAWVIDEO && !avctx->codec_tag && !avctx->bits_per_coded_sample) {
4007  uint32_t tag= avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
4009  avctx->codec_tag= tag;
4010  }
4011 
4012  /* estimate average framerate if not set by demuxer */
4013  if (st->info->codec_info_duration_fields &&
4014  !st->avg_frame_rate.num &&
4015  st->info->codec_info_duration) {
4016  int best_fps = 0;
4017  double best_error = 0.01;
4018  AVRational codec_frame_rate = avctx->framerate;
4019 
4020  if (st->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
4021  st->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
4022  st->info->codec_info_duration < 0)
4023  continue;
4025  st->info->codec_info_duration_fields * (int64_t) st->time_base.den,
4026  st->info->codec_info_duration * 2 * (int64_t) st->time_base.num, 60000);
4027 
4028  /* Round guessed framerate to a "standard" framerate if it's
4029  * within 1% of the original estimate. */
4030  for (j = 0; j < MAX_STD_TIMEBASES; j++) {
4031  AVRational std_fps = { get_std_framerate(j), 12 * 1001 };
4032  double error = fabs(av_q2d(st->avg_frame_rate) /
4033  av_q2d(std_fps) - 1);
4034 
4035  if (error < best_error) {
4036  best_error = error;
4037  best_fps = std_fps.num;
4038  }
4039 
4040  if (ic->internal->prefer_codec_framerate && codec_frame_rate.num > 0 && codec_frame_rate.den > 0) {
4041  error = fabs(av_q2d(codec_frame_rate) /
4042  av_q2d(std_fps) - 1);
4043  if (error < best_error) {
4044  best_error = error;
4045  best_fps = std_fps.num;
4046  }
4047  }
4048  }
4049  if (best_fps)
4051  best_fps, 12 * 1001, INT_MAX);
4052  }
4053 
4054  if (!st->r_frame_rate.num) {
4055  if ( avctx->time_base.den * (int64_t) st->time_base.num
4056  <= avctx->time_base.num * avctx->ticks_per_frame * (int64_t) st->time_base.den) {
4058  avctx->time_base.den, (int64_t)avctx->time_base.num * avctx->ticks_per_frame, INT_MAX);
4059  } else {
4060  st->r_frame_rate.num = st->time_base.den;
4061  st->r_frame_rate.den = st->time_base.num;
4062  }
4063  }
4065  AVRational hw_ratio = { avctx->height, avctx->width };
4067  hw_ratio);
4068  }
4069  } else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
4070  if (!avctx->bits_per_coded_sample)
4071  avctx->bits_per_coded_sample =
4073  // set stream disposition based on audio service type
4074  switch (avctx->audio_service_type) {
4077  break;
4080  break;
4083  break;
4086  break;
4089  break;
4090  }
4091  }
4092  }
4093 
4094  if (probesize)
4095  estimate_timings(ic, old_offset);
4096 
4097  av_opt_set(ic, "skip_clear", "0", AV_OPT_SEARCH_CHILDREN);
4098 
4099  if (ret >= 0 && ic->nb_streams)
4100  /* We could not have all the codec parameters before EOF. */
4101  ret = -1;
4102  for (i = 0; i < ic->nb_streams; i++) {
4103  const char *errmsg;
4104  st = ic->streams[i];
4105 
4106  /* if no packet was ever seen, update context now for has_codec_parameters */
4107  if (!st->internal->avctx_inited) {
4108  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
4110  st->codecpar->format = st->internal->avctx->sample_fmt;
4112  if (ret < 0)
4113  goto find_stream_info_err;
4114  }
4115  if (!has_codec_parameters(st, &errmsg)) {
4116  char buf[256];
4117  avcodec_string(buf, sizeof(buf), st->internal->avctx, 0);
4118  av_log(ic, AV_LOG_WARNING,
4119  "Could not find codec parameters for stream %d (%s): %s\n"
4120  "Consider increasing the value for the 'analyzeduration' and 'probesize' options\n",
4121  i, buf, errmsg);
4122  } else {
4123  ret = 0;
4124  }
4125  }
4126 
4128 
4129  /* update the stream parameters from the internal codec contexts */
4130  for (i = 0; i < ic->nb_streams; i++) {
4131  st = ic->streams[i];
4132 
4133  if (st->internal->avctx_inited) {
4134  int orig_w = st->codecpar->width;
4135  int orig_h = st->codecpar->height;
4137  if (ret < 0)
4138  goto find_stream_info_err;
4139 #if FF_API_LOWRES
4140  // The decoder might reduce the video size by the lowres factor.
4141  if (st->internal->avctx->lowres && orig_w) {
4142  st->codecpar->width = orig_w;
4143  st->codecpar->height = orig_h;
4144  }
4145 #endif
4146  }
4147 
4148 #if FF_API_LAVF_AVCTX
4150  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
4151  if (ret < 0)
4152  goto find_stream_info_err;
4153 
4154 #if FF_API_LOWRES
4155  // The old API (AVStream.codec) "requires" the resolution to be adjusted
4156  // by the lowres factor.
4157  if (st->internal->avctx->lowres && st->internal->avctx->width) {
4158  st->codec->lowres = st->internal->avctx->lowres;
4159  st->codec->width = st->internal->avctx->width;
4160  st->codec->height = st->internal->avctx->height;
4161  }
4162 #endif
4163 
4164  if (st->codec->codec_tag != MKTAG('t','m','c','d')) {
4165  st->codec->time_base = st->internal->avctx->time_base;
4166  st->codec->ticks_per_frame = st->internal->avctx->ticks_per_frame;
4167  }
4168  st->codec->framerate = st->avg_frame_rate;
4169 
4170  if (st->internal->avctx->subtitle_header) {
4171  st->codec->subtitle_header = av_malloc(st->internal->avctx->subtitle_header_size);
4172  if (!st->codec->subtitle_header)
4173  goto find_stream_info_err;
4174  st->codec->subtitle_header_size = st->internal->avctx->subtitle_header_size;
4175  memcpy(st->codec->subtitle_header, st->internal->avctx->subtitle_header,
4176  st->codec->subtitle_header_size);
4177  }
4178 
4179  // Fields unavailable in AVCodecParameters
4180  st->codec->coded_width = st->internal->avctx->coded_width;
4181  st->codec->coded_height = st->internal->avctx->coded_height;
4182  st->codec->properties = st->internal->avctx->properties;
4184 #endif
4185 
4186  st->internal->avctx_inited = 0;
4187  }
4188 
4189 find_stream_info_err:
4190  for (i = 0; i < ic->nb_streams; i++) {
4191  st = ic->streams[i];
4192  if (st->info)
4193  av_freep(&st->info->duration_error);
4194  avcodec_close(ic->streams[i]->internal->avctx);
4195  av_freep(&ic->streams[i]->info);
4198  }
4199  if (ic->pb)
4200  av_log(ic, AV_LOG_DEBUG, "After avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d frames:%d\n",
4201  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, count);
4202  return ret;
4203 
4204 unref_then_goto_end:
4205  av_packet_unref(&pkt1);
4206  goto find_stream_info_err;
4207 }
4208 
4210 {
4211  int i, j;
4212 
4213  for (i = 0; i < ic->nb_programs; i++) {
4214  if (ic->programs[i] == last) {
4215  last = NULL;
4216  } else {
4217  if (!last)
4218  for (j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
4219  if (ic->programs[i]->stream_index[j] == s)
4220  return ic->programs[i];
4221  }
4222  }
4223  return NULL;
4224 }
4225 
4227  int wanted_stream_nb, int related_stream,
4228  AVCodec **decoder_ret, int flags)
4229 {
4230  int i, nb_streams = ic->nb_streams;
4232  int best_count = -1, best_multiframe = -1, best_disposition = -1;
4233  int count, multiframe, disposition;
4234  int64_t best_bitrate = -1;
4235  int64_t bitrate;
4236  unsigned *program = NULL;
4237  const AVCodec *decoder = NULL, *best_decoder = NULL;
4238 
4239  if (related_stream >= 0 && wanted_stream_nb < 0) {
4240  AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
4241  if (p) {
4242  program = p->stream_index;
4243  nb_streams = p->nb_stream_indexes;
4244  }
4245  }
4246  for (i = 0; i < nb_streams; i++) {
4247  int real_stream_index = program ? program[i] : i;
4248  AVStream *st = ic->streams[real_stream_index];
4249  AVCodecParameters *par = st->codecpar;
4250  if (par->codec_type != type)
4251  continue;
4252  if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
4253  continue;
4254  if (type == AVMEDIA_TYPE_AUDIO && !(par->channels && par->sample_rate))
4255  continue;
4256  if (decoder_ret) {
4257  decoder = find_decoder(ic, st, par->codec_id);
4258  if (!decoder) {
4259  if (ret < 0)
4261  continue;
4262  }
4263  }
4265  + !! (st->disposition & AV_DISPOSITION_DEFAULT);
4266  count = st->codec_info_nb_frames;
4267  bitrate = par->bit_rate;
4268  multiframe = FFMIN(5, count);
4269  if ((best_disposition > disposition) ||
4270  (best_disposition == disposition && best_multiframe > multiframe) ||
4271  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate > bitrate) ||
4272  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
4273  continue;
4274  best_disposition = disposition;
4275  best_count = count;
4276  best_bitrate = bitrate;
4277  best_multiframe = multiframe;
4278  ret = real_stream_index;
4279  best_decoder = decoder;
4280  if (program && i == nb_streams - 1 && ret < 0) {
4281  program = NULL;
4282  nb_streams = ic->nb_streams;
4283  /* no related stream found, try again with everything */
4284  i = 0;
4285  }
4286  }
4287  if (decoder_ret)
4288  *decoder_ret = (AVCodec*)best_decoder;
4289  return ret;
4290 }
4291 
4292 /*******************************************************/
4293 
4295 {
4296  if (s->iformat->read_play)
4297  return s->iformat->read_play(s);
4298  if (s->pb)
4299  return avio_pause(s->pb, 0);
4300  return AVERROR(ENOSYS);
4301 }
4302 
4304 {
4305  if (s->iformat->read_pause)
4306  return s->iformat->read_pause(s);
4307  if (s->pb)
4308  return avio_pause(s->pb, 1);
4309  return AVERROR(ENOSYS);
4310 }
4311 
4313 {
4314  int ret, i;
4315 
4316  dst->id = src->id;
4317  dst->time_base = src->time_base;
4318  dst->nb_frames = src->nb_frames;
4319  dst->disposition = src->disposition;
4321  dst->avg_frame_rate = src->avg_frame_rate;
4322  dst->r_frame_rate = src->r_frame_rate;
4323 
4324  av_dict_free(&dst->metadata);
4325  ret = av_dict_copy(&dst->metadata, src->metadata, 0);
4326  if (ret < 0)
4327  return ret;
4328 
4329  ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
4330  if (ret < 0)
4331  return ret;
4332 
4333  /* Free existing side data*/
4334  for (i = 0; i < dst->nb_side_data; i++)
4335  av_free(dst->side_data[i].data);
4336  av_freep(&dst->side_data);
4337  dst->nb_side_data = 0;
4338 
4339  /* Copy side data if present */
4340  if (src->nb_side_data) {
4342  sizeof(AVPacketSideData));
4343  if (!dst->side_data)
4344  return AVERROR(ENOMEM);
4345  dst->nb_side_data = src->nb_side_data;
4346 
4347  for (i = 0; i < src->nb_side_data; i++) {
4348  uint8_t *data = av_memdup(src->side_data[i].data,
4349  src->side_data[i].size);
4350  if (!data)
4351  return AVERROR(ENOMEM);
4352  dst->side_data[i].type = src->side_data[i].type;
4353  dst->side_data[i].size = src->side_data[i].size;
4354  dst->side_data[i].data = data;
4355  }
4356  }
4357 
4358 #if FF_API_LAVF_FFSERVER
4360  av_freep(&dst->recommended_encoder_configuration);
4361  if (src->recommended_encoder_configuration) {
4362  const char *conf_str = src->recommended_encoder_configuration;
4363  dst->recommended_encoder_configuration = av_strdup(conf_str);
4364  if (!dst->recommended_encoder_configuration)
4365  return AVERROR(ENOMEM);
4366  }
4368 #endif
4369 
4370  return 0;
4371 }
4372 
4373 static void free_stream(AVStream **pst)
4374 {
4375  AVStream *st = *pst;
4376  int i;
4377 
4378  if (!st)
4379  return;
4380 
4381  for (i = 0; i < st->nb_side_data; i++)
4382  av_freep(&st->side_data[i].data);
4383  av_freep(&st->side_data);
4384 
4385  if (st->parser)
4386  av_parser_close(st->parser);
4387 
4388  if (st->attached_pic.data)
4390 
4391  if (st->internal) {
4393  for (i = 0; i < st->internal->nb_bsfcs; i++) {
4394  av_bsf_free(&st->internal->bsfcs[i]);
4395  av_freep(&st->internal->bsfcs);
4396  }
4397  av_freep(&st->internal->priv_pts);
4400  }
4401  av_freep(&st->internal);
4402 
4403  av_dict_free(&st->metadata);
4405  av_freep(&st->probe_data.buf);
4406  av_freep(&st->index_entries);
4407 #if FF_API_LAVF_AVCTX
4409  avcodec_free_context(&st->codec);
4411 #endif
4412  av_freep(&st->priv_data);
4413  if (st->info)
4414  av_freep(&st->info->duration_error);
4415  av_freep(&st->info);
4416 #if FF_API_LAVF_FFSERVER
4418  av_freep(&st->recommended_encoder_configuration);
4420 #endif
4421 
4422  av_freep(pst);
4423 }
4424 
4426 {
4427  av_assert0(s->nb_streams>0);
4428  av_assert0(s->streams[ s->nb_streams - 1 ] == st);
4429 
4430  free_stream(&s->streams[ --s->nb_streams ]);
4431 }
4432 
4434 {
4435  int i;
4436 
4437  if (!s)
4438  return;
4439 
4440  if (s->oformat && s->oformat->deinit && s->internal->initialized)
4441  s->oformat->deinit(s);
4442 
4443  av_opt_free(s);
4444  if (s->iformat && s->iformat->priv_class && s->priv_data)
4445  av_opt_free(s->priv_data);
4446  if (s->oformat && s->oformat->priv_class && s->priv_data)
4447  av_opt_free(s->priv_data);
4448 
4449  for (i = s->nb_streams - 1; i >= 0; i--)
4450  ff_free_stream(s, s->streams[i]);
4451 
4452 
4453  for (i = s->nb_programs - 1; i >= 0; i--) {
4454  av_dict_free(&s->programs[i]->metadata);
4455  av_freep(&s->programs[i]->stream_index);
4456  av_freep(&s->programs[i]);
4457  }
4458  av_freep(&s->programs);
4459  av_freep(&s->priv_data);
4460  while (s->nb_chapters--) {
4462  av_freep(&s->chapters[s->nb_chapters]);
4463  }
4464  av_freep(&s->chapters);
4465  av_dict_free(&s->metadata);
4467  av_freep(&s->streams);
4468  flush_packet_queue(s);
4469  av_freep(&s->internal);
4470  av_freep(&s->url);
4471  av_free(s);
4472 }
4473 
4475 {
4476  AVFormatContext *s;
4477  AVIOContext *pb;
4478 
4479  if (!ps || !*ps)
4480  return;
4481 
4482  s = *ps;
4483  pb = s->pb;
4484 
4485  if ((s->iformat && strcmp(s->iformat->name, "image2") && s->iformat->flags & AVFMT_NOFILE) ||
4486  (s->flags & AVFMT_FLAG_CUSTOM_IO))
4487  pb = NULL;
4488 
4489  flush_packet_queue(s);
4490 
4491  if (s->iformat)
4492  if (s->iformat->read_close)
4493  s->iformat->read_close(s);
4494 
4496 
4497  *ps = NULL;
4498 
4499  avio_close(pb);
4500 }
4501 
4503 {
4504  AVStream *st;
4505  int i;
4506  AVStream **streams;
4507 
4508  if (s->nb_streams >= FFMIN(s->max_streams, INT_MAX/sizeof(*streams))) {
4509  if (s->max_streams < INT_MAX/sizeof(*streams))
4510  av_log(s, AV_LOG_ERROR, "Number of streams exceeds max_streams parameter (%d), see the documentation if you wish to increase it\n", s->max_streams);
4511  return NULL;
4512  }
4513  streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
4514  if (!streams)
4515  return NULL;
4516  s->streams = streams;
4517 
4518  st = av_mallocz(sizeof(AVStream));
4519  if (!st)
4520  return NULL;
4521  if (!(st->info = av_mallocz(sizeof(*st->info)))) {
4522  av_free(st);
4523  return NULL;
4524  }
4525  st->info->last_dts = AV_NOPTS_VALUE;
4526 
4527 #if FF_API_LAVF_AVCTX
4529  st->codec = avcodec_alloc_context3(c);
4530  if (!st->codec) {
4531  av_free(st->info);
4532  av_free(st);
4533  return NULL;
4534  }
4536 #endif
4537 
4538  st->internal = av_mallocz(sizeof(*st->internal));
4539  if (!st->internal)
4540  goto fail;
4541 
4543  if (!st->codecpar)
4544  goto fail;
4545 
4547  if (!st->internal->avctx)
4548  goto fail;
4549 
4550  if (s->iformat) {
4551 #if FF_API_LAVF_AVCTX
4553  /* no default bitrate if decoding */
4554  st->codec->bit_rate = 0;
4556 #endif
4557 
4558  /* default pts setting is MPEG-like */
4559  avpriv_set_pts_info(st, 33, 1, 90000);
4560  /* we set the current DTS to 0 so that formats without any timestamps
4561  * but durations get some timestamps, formats with some unknown
4562  * timestamps have their first few packets buffered and the
4563  * timestamps corrected before they are returned to the user */
4564  st->cur_dts = RELATIVE_TS_BASE;
4565  } else {
4566  st->cur_dts = AV_NOPTS_VALUE;
4567  }
4568 
4569  st->index = s->nb_streams;
4570  st->start_time = AV_NOPTS_VALUE;
4571  st->duration = AV_NOPTS_VALUE;
4572  st->first_dts = AV_NOPTS_VALUE;
4576 
4579  for (i = 0; i < MAX_REORDER_DELAY + 1; i++)
4580  st->pts_buffer[i] = AV_NOPTS_VALUE;
4581 
4582  st->sample_aspect_ratio = (AVRational) { 0, 1 };
4583<