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  // TODO: Adapt callers in this file so the line below can use
464  // av_packet_move_ref() to effectively move the reference
465  // to the list.
466  pktl->pkt = *pkt;
467  }
468 
469  if (*packet_buffer)
470  (*plast_pktl)->next = pktl;
471  else
472  *packet_buffer = pktl;
473 
474  /* Add the packet in the buffered packet list. */
475  *plast_pktl = pktl;
476  return 0;
477 }
478 
480 {
481  int i, ret;
482  for (i = 0; i < s->nb_streams; i++)
484  s->streams[i]->discard < AVDISCARD_ALL) {
485  if (s->streams[i]->attached_pic.size <= 0) {
487  "Attached picture on stream %d has invalid size, "
488  "ignoring\n", i);
489  continue;
490  }
491 
494  &s->streams[i]->attached_pic,
496  if (ret < 0)
497  return ret;
498  }
499  return 0;
500 }
501 
503 {
504  int i, ret;
505  for (i = 0; i < s->nb_streams; i++) {
506  AVStream *st = s->streams[i];
507 
508  if (!st->internal->need_context_update)
509  continue;
510 
511  /* close parser, because it depends on the codec */
512  if (st->parser && st->internal->avctx->codec_id != st->codecpar->codec_id) {
513  av_parser_close(st->parser);
514  st->parser = NULL;
515  }
516 
517  /* update internal codec context, for the parser */
519  if (ret < 0)
520  return ret;
521 
522 #if FF_API_LAVF_AVCTX
524  /* update deprecated public codec context */
525  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
526  if (ret < 0)
527  return ret;
529 #endif
530 
531  st->internal->need_context_update = 0;
532  }
533  return 0;
534 }
535 
536 
537 int avformat_open_input(AVFormatContext **ps, const char *filename,
539 {
540  AVFormatContext *s = *ps;
541  int i, ret = 0;
542  AVDictionary *tmp = NULL;
543  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
544 
545  if (!s && !(s = avformat_alloc_context()))
546  return AVERROR(ENOMEM);
547  if (!s->av_class) {
548  av_log(NULL, AV_LOG_ERROR, "Input context has not been properly allocated by avformat_alloc_context() and is not NULL either\n");
549  return AVERROR(EINVAL);
550  }
551  if (fmt)
552  s->iformat = fmt;
553 
554  if (options)
555  av_dict_copy(&tmp, *options, 0);
556 
557  if (s->pb) // must be before any goto fail
559 
560  if ((ret = av_opt_set_dict(s, &tmp)) < 0)
561  goto fail;
562 
563  if (!(s->url = av_strdup(filename ? filename : ""))) {
564  ret = AVERROR(ENOMEM);
565  goto fail;
566  }
567 
568 #if FF_API_FORMAT_FILENAME
570  av_strlcpy(s->filename, filename ? filename : "", sizeof(s->filename));
572 #endif
573  if ((ret = init_input(s, filename, &tmp)) < 0)
574  goto fail;
575  s->probe_score = ret;
576 
577  if (!s->protocol_whitelist && s->pb && s->pb->protocol_whitelist) {
579  if (!s->protocol_whitelist) {
580  ret = AVERROR(ENOMEM);
581  goto fail;
582  }
583  }
584 
585  if (!s->protocol_blacklist && s->pb && s->pb->protocol_blacklist) {
587  if (!s->protocol_blacklist) {
588  ret = AVERROR(ENOMEM);
589  goto fail;
590  }
591  }
592 
593  if (s->format_whitelist && av_match_list(s->iformat->name, s->format_whitelist, ',') <= 0) {
594  av_log(s, AV_LOG_ERROR, "Format not on whitelist \'%s\'\n", s->format_whitelist);
595  ret = AVERROR(EINVAL);
596  goto fail;
597  }
598 
600 
601  /* Check filename in case an image number is expected. */
602  if (s->iformat->flags & AVFMT_NEEDNUMBER) {
603  if (!av_filename_number_test(filename)) {
604  ret = AVERROR(EINVAL);
605  goto fail;
606  }
607  }
608 
610 
611  /* Allocate private data. */
612  if (s->iformat->priv_data_size > 0) {
613  if (!(s->priv_data = av_mallocz(s->iformat->priv_data_size))) {
614  ret = AVERROR(ENOMEM);
615  goto fail;
616  }
617  if (s->iformat->priv_class) {
618  *(const AVClass **) s->priv_data = s->iformat->priv_class;
620  if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
621  goto fail;
622  }
623  }
624 
625  /* e.g. AVFMT_NOFILE formats will not have a AVIOContext */
626  if (s->pb)
627  ff_id3v2_read_dict(s->pb, &s->internal->id3v2_meta, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
628 
629 
630  if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->iformat->read_header)
631  if ((ret = s->iformat->read_header(s)) < 0)
632  goto fail;
633 
634  if (!s->metadata) {
635  s->metadata = s->internal->id3v2_meta;
636  s->internal->id3v2_meta = NULL;
637  } else if (s->internal->id3v2_meta) {
638  int level = AV_LOG_WARNING;
640  level = AV_LOG_ERROR;
641  av_log(s, level, "Discarding ID3 tags because more suitable tags were found.\n");
644  return AVERROR_INVALIDDATA;
645  }
646 
647  if (id3v2_extra_meta) {
648  if (!strcmp(s->iformat->name, "mp3") || !strcmp(s->iformat->name, "aac") ||
649  !strcmp(s->iformat->name, "tta") || !strcmp(s->iformat->name, "wav")) {
650  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0)
651  goto fail;
652  if ((ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0)
653  goto fail;
654  if ((ret = ff_id3v2_parse_priv(s, &id3v2_extra_meta)) < 0)
655  goto fail;
656  } else
657  av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
658  }
659  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
660 
661  if ((ret = avformat_queue_attached_pictures(s)) < 0)
662  goto fail;
663 
664  if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->pb && !s->internal->data_offset)
665  s->internal->data_offset = avio_tell(s->pb);
666 
668 
670 
671  for (i = 0; i < s->nb_streams; i++)
673 
674  if (options) {
675  av_dict_free(options);
676  *options = tmp;
677  }
678  *ps = s;
679  return 0;
680 
681 fail:
682  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
683  av_dict_free(&tmp);
684  if (s->pb && !(s->flags & AVFMT_FLAG_CUSTOM_IO))
685  avio_closep(&s->pb);
687  *ps = NULL;
688  return ret;
689 }
690 
691 /*******************************************************/
692 
694 {
695  switch (st->codecpar->codec_type) {
696  case AVMEDIA_TYPE_VIDEO:
697  if (s->video_codec_id)
698  st->codecpar->codec_id = s->video_codec_id;
699  break;
700  case AVMEDIA_TYPE_AUDIO:
701  if (s->audio_codec_id)
702  st->codecpar->codec_id = s->audio_codec_id;
703  break;
705  if (s->subtitle_codec_id)
707  break;
708  case AVMEDIA_TYPE_DATA:
709  if (s->data_codec_id)
710  st->codecpar->codec_id = s->data_codec_id;
711  break;
712  }
713 }
714 
715 static int probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
716 {
717  if (st->request_probe>0) {
718  AVProbeData *pd = &st->probe_data;
719  int end;
720  av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
721  --st->probe_packets;
722 
723  if (pkt) {
724  uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
725  if (!new_buf) {
727  "Failed to reallocate probe buffer for stream %d\n",
728  st->index);
729  goto no_packet;
730  }
731  pd->buf = new_buf;
732  memcpy(pd->buf + pd->buf_size, pkt->data, pkt->size);
733  pd->buf_size += pkt->size;
734  memset(pd->buf + pd->buf_size, 0, AVPROBE_PADDING_SIZE);
735  } else {
736 no_packet:
737  st->probe_packets = 0;
738  if (!pd->buf_size) {
740  "nothing to probe for stream %d\n", st->index);
741  }
742  }
743 
745  || st->probe_packets<= 0;
746 
747  if (end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)) {
748  int score = set_codec_from_probe_data(s, st, pd);
750  || end) {
751  pd->buf_size = 0;
752  av_freep(&pd->buf);
753  st->request_probe = -1;
754  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
755  av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
756  } else
757  av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
758  }
759  force_codec_ids(s, st);
760  }
761  }
762  return 0;
763 }
764 
765 static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
766 {
767  int64_t ref = pkt->dts;
768  int i, pts_wrap_behavior;
769  int64_t pts_wrap_reference;
770  AVProgram *first_program;
771 
772  if (ref == AV_NOPTS_VALUE)
773  ref = pkt->pts;
774  if (st->pts_wrap_reference != AV_NOPTS_VALUE || st->pts_wrap_bits >= 63 || ref == AV_NOPTS_VALUE || !s->correct_ts_overflow)
775  return 0;
776  ref &= (1LL << st->pts_wrap_bits)-1;
777 
778  // reference time stamp should be 60 s before first time stamp
779  pts_wrap_reference = ref - av_rescale(60, st->time_base.den, st->time_base.num);
780  // if first time stamp is not more than 1/8 and 60s before the wrap point, subtract rather than add wrap offset
781  pts_wrap_behavior = (ref < (1LL << st->pts_wrap_bits) - (1LL << st->pts_wrap_bits-3)) ||
782  (ref < (1LL << st->pts_wrap_bits) - av_rescale(60, st->time_base.den, st->time_base.num)) ?
784 
785  first_program = av_find_program_from_stream(s, NULL, stream_index);
786 
787  if (!first_program) {
788  int default_stream_index = av_find_default_stream_index(s);
789  if (s->streams[default_stream_index]->pts_wrap_reference == AV_NOPTS_VALUE) {
790  for (i = 0; i < s->nb_streams; i++) {
792  continue;
793  s->streams[i]->pts_wrap_reference = pts_wrap_reference;
794  s->streams[i]->pts_wrap_behavior = pts_wrap_behavior;
795  }
796  }
797  else {
798  st->pts_wrap_reference = s->streams[default_stream_index]->pts_wrap_reference;
799  st->pts_wrap_behavior = s->streams[default_stream_index]->pts_wrap_behavior;
800  }
801  }
802  else {
803  AVProgram *program = first_program;
804  while (program) {
805  if (program->pts_wrap_reference != AV_NOPTS_VALUE) {
806  pts_wrap_reference = program->pts_wrap_reference;
807  pts_wrap_behavior = program->pts_wrap_behavior;
808  break;
809  }
810  program = av_find_program_from_stream(s, program, stream_index);
811  }
812 
813  // update every program with differing pts_wrap_reference
814  program = first_program;
815  while (program) {
816  if (program->pts_wrap_reference != pts_wrap_reference) {
817  for (i = 0; i<program->nb_stream_indexes; i++) {
818  s->streams[program->stream_index[i]]->pts_wrap_reference = pts_wrap_reference;
819  s->streams[program->stream_index[i]]->pts_wrap_behavior = pts_wrap_behavior;
820  }
821 
822  program->pts_wrap_reference = pts_wrap_reference;
823  program->pts_wrap_behavior = pts_wrap_behavior;
824  }
825  program = av_find_program_from_stream(s, program, stream_index);
826  }
827  }
828  return 1;
829 }
830 
832 {
833  int ret, i, err;
834  AVStream *st;
835 
836  for (;;) {
838 
839  if (pktl) {
840  *pkt = pktl->pkt;
841  st = s->streams[pkt->stream_index];
843  if ((err = probe_codec(s, st, NULL)) < 0)
844  return err;
845  if (st->request_probe <= 0) {
846  s->internal->raw_packet_buffer = pktl->next;
848  av_free(pktl);
849  return 0;
850  }
851  }
852 
853  pkt->data = NULL;
854  pkt->size = 0;
855  av_init_packet(pkt);
856  ret = s->iformat->read_packet(s, pkt);
857  if (ret < 0) {
858  /* Some demuxers return FFERROR_REDO when they consume
859  data and discard it (ignored streams, junk, extradata).
860  We must re-call the demuxer to get the real packet. */
861  if (ret == FFERROR_REDO)
862  continue;
863  if (!pktl || ret == AVERROR(EAGAIN))
864  return ret;
865  for (i = 0; i < s->nb_streams; i++) {
866  st = s->streams[i];
867  if (st->probe_packets || st->request_probe > 0)
868  if ((err = probe_codec(s, st, NULL)) < 0)
869  return err;
870  av_assert0(st->request_probe <= 0);
871  }
872  continue;
873  }
874 
875  err = av_packet_make_refcounted(pkt);
876  if (err < 0)
877  return err;
878 
879  if ((s->flags & AVFMT_FLAG_DISCARD_CORRUPT) &&
880  (pkt->flags & AV_PKT_FLAG_CORRUPT)) {
882  "Dropped corrupted packet (stream = %d)\n",
883  pkt->stream_index);
884  av_packet_unref(pkt);
885  continue;
886  }
887 
888  if (pkt->stream_index >= (unsigned)s->nb_streams) {
889  av_log(s, AV_LOG_ERROR, "Invalid stream index %d\n", pkt->stream_index);
890  continue;
891  }
892 
893  st = s->streams[pkt->stream_index];
894 
896  // correct first time stamps to negative values
897  if (!is_relative(st->first_dts))
898  st->first_dts = wrap_timestamp(st, st->first_dts);
899  if (!is_relative(st->start_time))
900  st->start_time = wrap_timestamp(st, st->start_time);
901  if (!is_relative(st->cur_dts))
902  st->cur_dts = wrap_timestamp(st, st->cur_dts);
903  }
904 
905  pkt->dts = wrap_timestamp(st, pkt->dts);
906  pkt->pts = wrap_timestamp(st, pkt->pts);
907 
908  force_codec_ids(s, st);
909 
910  /* TODO: audio: time filter; video: frame reordering (pts != dts) */
912  pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
913 
914  if (!pktl && st->request_probe <= 0)
915  return ret;
916 
919  pkt, 0);
920  if (err)
921  return err;
923 
924  if ((err = probe_codec(s, st, pkt)) < 0)
925  return err;
926  }
927 }
928 
929 
930 /**********************************************************/
931 
933 {
934  switch(avctx->codec_id) {
935  case AV_CODEC_ID_MP1:
936  case AV_CODEC_ID_MP2:
937  case AV_CODEC_ID_MP3:
938  case AV_CODEC_ID_CODEC2:
939  return 1;
940  }
941 
942  return 0;
943 }
944 
945 /**
946  * Return the frame duration in seconds. Return 0 if not available.
947  */
948 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
950 {
951  AVRational codec_framerate = s->iformat ? st->internal->avctx->framerate :
952  av_mul_q(av_inv_q(st->internal->avctx->time_base), (AVRational){1, st->internal->avctx->ticks_per_frame});
953  int frame_size, sample_rate;
954 
955 #if FF_API_LAVF_AVCTX
957  if ((!codec_framerate.den || !codec_framerate.num) && st->codec->time_base.den && st->codec->time_base.num)
958  codec_framerate = av_mul_q(av_inv_q(st->codec->time_base), (AVRational){1, st->codec->ticks_per_frame});
960 #endif
961 
962  *pnum = 0;
963  *pden = 0;
964  switch (st->codecpar->codec_type) {
965  case AVMEDIA_TYPE_VIDEO:
966  if (st->r_frame_rate.num && !pc && s->iformat) {
967  *pnum = st->r_frame_rate.den;
968  *pden = st->r_frame_rate.num;
969  } else if (st->time_base.num * 1000LL > st->time_base.den) {
970  *pnum = st->time_base.num;
971  *pden = st->time_base.den;
972  } else if (codec_framerate.den * 1000LL > codec_framerate.num) {
974  av_reduce(pnum, pden,
975  codec_framerate.den,
976  codec_framerate.num * (int64_t)st->internal->avctx->ticks_per_frame,
977  INT_MAX);
978 
979  if (pc && pc->repeat_pict) {
980  av_assert0(s->iformat); // this may be wrong for interlaced encoding but its not used for that case
981  av_reduce(pnum, pden,
982  (*pnum) * (1LL + pc->repeat_pict),
983  (*pden),
984  INT_MAX);
985  }
986  /* If this codec can be interlaced or progressive then we need
987  * a parser to compute duration of a packet. Thus if we have
988  * no parser in such case leave duration undefined. */
989  if (st->internal->avctx->ticks_per_frame > 1 && !pc)
990  *pnum = *pden = 0;
991  }
992  break;
993  case AVMEDIA_TYPE_AUDIO:
994  if (st->internal->avctx_inited) {
995  frame_size = av_get_audio_frame_duration(st->internal->avctx, pkt->size);
996  sample_rate = st->internal->avctx->sample_rate;
997  } else {
998  frame_size = av_get_audio_frame_duration2(st->codecpar, pkt->size);
999  sample_rate = st->codecpar->sample_rate;
1000  }
1001  if (frame_size <= 0 || sample_rate <= 0)
1002  break;
1003  *pnum = frame_size;
1004  *pden = sample_rate;
1005  break;
1006  default:
1007  break;
1008  }
1009 }
1010 
1011 static int is_intra_only(enum AVCodecID id)
1012 {
1014  if (!d)
1015  return 0;
1017  return 0;
1018  return 1;
1019 }
1020 
1022 {
1023  if (st->codecpar->codec_id != AV_CODEC_ID_H264) return 1;
1024  if (!st->info) // if we have left find_stream_info then nb_decoded_frames won't increase anymore for stream copy
1025  return 1;
1026 #if CONFIG_H264_DECODER
1027  if (st->internal->avctx->has_b_frames &&
1029  return 1;
1030 #endif
1031  if (st->internal->avctx->has_b_frames<3)
1032  return st->nb_decoded_frames >= 7;
1033  else if (st->internal->avctx->has_b_frames<4)
1034  return st->nb_decoded_frames >= 18;
1035  else
1036  return st->nb_decoded_frames >= 20;
1037 }
1038 
1040 {
1041  if (pktl->next)
1042  return pktl->next;
1043  if (pktl == s->internal->packet_buffer_end)
1044  return s->internal->parse_queue;
1045  return NULL;
1046 }
1047 
1048 static int64_t select_from_pts_buffer(AVStream *st, int64_t *pts_buffer, int64_t dts) {
1049  int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
1051 
1052  if(!onein_oneout) {
1053  int delay = st->internal->avctx->has_b_frames;
1054  int i;
1055 
1056  if (dts == AV_NOPTS_VALUE) {
1057  int64_t best_score = INT64_MAX;
1058  for (i = 0; i<delay; i++) {
1059  if (st->pts_reorder_error_count[i]) {
1060  int64_t score = st->pts_reorder_error[i] / st->pts_reorder_error_count[i];
1061  if (score < best_score) {
1062  best_score = score;
1063  dts = pts_buffer[i];
1064  }
1065  }
1066  }
1067  } else {
1068  for (i = 0; i<delay; i++) {
1069  if (pts_buffer[i] != AV_NOPTS_VALUE) {
1070  int64_t diff = FFABS(pts_buffer[i] - dts)
1071  + (uint64_t)st->pts_reorder_error[i];
1072  diff = FFMAX(diff, st->pts_reorder_error[i]);
1073  st->pts_reorder_error[i] = diff;
1074  st->pts_reorder_error_count[i]++;
1075  if (st->pts_reorder_error_count[i] > 250) {
1076  st->pts_reorder_error[i] >>= 1;
1077  st->pts_reorder_error_count[i] >>= 1;
1078  }
1079  }
1080  }
1081  }
1082  }
1083 
1084  if (dts == AV_NOPTS_VALUE)
1085  dts = pts_buffer[0];
1086 
1087  return dts;
1088 }
1089 
1090 /**
1091  * Updates the dts of packets of a stream in pkt_buffer, by re-ordering the pts
1092  * of the packets in a window.
1093  */
1094 static void update_dts_from_pts(AVFormatContext *s, int stream_index,
1095  AVPacketList *pkt_buffer)
1096 {
1097  AVStream *st = s->streams[stream_index];
1098  int delay = st->internal->avctx->has_b_frames;
1099  int i;
1100 
1101  int64_t pts_buffer[MAX_REORDER_DELAY+1];
1102 
1103  for (i = 0; i<MAX_REORDER_DELAY+1; i++)
1104  pts_buffer[i] = AV_NOPTS_VALUE;
1105 
1106  for (; pkt_buffer; pkt_buffer = get_next_pkt(s, st, pkt_buffer)) {
1107  if (pkt_buffer->pkt.stream_index != stream_index)
1108  continue;
1109 
1110  if (pkt_buffer->pkt.pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
1111  pts_buffer[0] = pkt_buffer->pkt.pts;
1112  for (i = 0; i<delay && pts_buffer[i] > pts_buffer[i + 1]; i++)
1113  FFSWAP(int64_t, pts_buffer[i], pts_buffer[i + 1]);
1114 
1115  pkt_buffer->pkt.dts = select_from_pts_buffer(st, pts_buffer, pkt_buffer->pkt.dts);
1116  }
1117  }
1118 }
1119 
1120 static void update_initial_timestamps(AVFormatContext *s, int stream_index,
1121  int64_t dts, int64_t pts, AVPacket *pkt)
1122 {
1123  AVStream *st = s->streams[stream_index];
1125  AVPacketList *pktl_it;
1126 
1127  uint64_t shift;
1128 
1129  if (st->first_dts != AV_NOPTS_VALUE ||
1130  dts == AV_NOPTS_VALUE ||
1131  st->cur_dts == AV_NOPTS_VALUE ||
1132  st->cur_dts < INT_MIN + RELATIVE_TS_BASE ||
1133  is_relative(dts))
1134  return;
1135 
1136  st->first_dts = dts - (st->cur_dts - RELATIVE_TS_BASE);
1137  st->cur_dts = dts;
1138  shift = (uint64_t)st->first_dts - RELATIVE_TS_BASE;
1139 
1140  if (is_relative(pts))
1141  pts += shift;
1142 
1143  for (pktl_it = pktl; pktl_it; pktl_it = get_next_pkt(s, st, pktl_it)) {
1144  if (pktl_it->pkt.stream_index != stream_index)
1145  continue;
1146  if (is_relative(pktl_it->pkt.pts))
1147  pktl_it->pkt.pts += shift;
1148 
1149  if (is_relative(pktl_it->pkt.dts))
1150  pktl_it->pkt.dts += shift;
1151 
1152  if (st->start_time == AV_NOPTS_VALUE && pktl_it->pkt.pts != AV_NOPTS_VALUE) {
1153  st->start_time = pktl_it->pkt.pts;
1155  st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
1156  }
1157  }
1158 
1160  update_dts_from_pts(s, stream_index, pktl);
1161  }
1162 
1163  if (st->start_time == AV_NOPTS_VALUE) {
1164  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || !(pkt->flags & AV_PKT_FLAG_DISCARD)) {
1165  st->start_time = pts;
1166  }
1168  st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
1169  }
1170 }
1171 
1173  int stream_index, int duration)
1174 {
1176  int64_t cur_dts = RELATIVE_TS_BASE;
1177 
1178  if (st->first_dts != AV_NOPTS_VALUE) {
1180  return;
1182  cur_dts = st->first_dts;
1183  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
1184  if (pktl->pkt.stream_index == stream_index) {
1185  if (pktl->pkt.pts != pktl->pkt.dts ||
1186  pktl->pkt.dts != AV_NOPTS_VALUE ||
1187  pktl->pkt.duration)
1188  break;
1189  cur_dts -= duration;
1190  }
1191  }
1192  if (pktl && pktl->pkt.dts != st->first_dts) {
1193  av_log(s, AV_LOG_DEBUG, "first_dts %s not matching first dts %s (pts %s, duration %"PRId64") in the queue\n",
1194  av_ts2str(st->first_dts), av_ts2str(pktl->pkt.dts), av_ts2str(pktl->pkt.pts), pktl->pkt.duration);
1195  return;
1196  }
1197  if (!pktl) {
1198  av_log(s, AV_LOG_DEBUG, "first_dts %s but no packet with dts in the queue\n", av_ts2str(st->first_dts));
1199  return;
1200  }
1202  st->first_dts = cur_dts;
1203  } else if (st->cur_dts != RELATIVE_TS_BASE)
1204  return;
1205 
1206  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
1207  if (pktl->pkt.stream_index != stream_index)
1208  continue;
1209  if ((pktl->pkt.pts == pktl->pkt.dts ||
1210  pktl->pkt.pts == AV_NOPTS_VALUE) &&
1211  (pktl->pkt.dts == AV_NOPTS_VALUE ||
1212  pktl->pkt.dts == st->first_dts ||
1213  pktl->pkt.dts == RELATIVE_TS_BASE) &&
1214  !pktl->pkt.duration) {
1215  pktl->pkt.dts = cur_dts;
1216  if (!st->internal->avctx->has_b_frames)
1217  pktl->pkt.pts = cur_dts;
1218 // if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1219  pktl->pkt.duration = duration;
1220  } else
1221  break;
1222  cur_dts = pktl->pkt.dts + pktl->pkt.duration;
1223  }
1224  if (!pktl)
1225  st->cur_dts = cur_dts;
1226 }
1227 
1230  int64_t next_dts, int64_t next_pts)
1231 {
1232  int num, den, presentation_delayed, delay, i;
1233  int64_t offset;
1235  int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
1237 
1238  if (s->flags & AVFMT_FLAG_NOFILLIN)
1239  return;
1240 
1241  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && pkt->dts != AV_NOPTS_VALUE) {
1242  if (pkt->dts == pkt->pts && st->last_dts_for_order_check != AV_NOPTS_VALUE) {
1243  if (st->last_dts_for_order_check <= pkt->dts) {
1244  st->dts_ordered++;
1245  } else {
1247  "DTS %"PRIi64" < %"PRIi64" out of order\n",
1248  pkt->dts,
1250  st->dts_misordered++;
1251  }
1252  if (st->dts_ordered + st->dts_misordered > 250) {
1253  st->dts_ordered >>= 1;
1254  st->dts_misordered >>= 1;
1255  }
1256  }
1257 
1258  st->last_dts_for_order_check = pkt->dts;
1259  if (st->dts_ordered < 8*st->dts_misordered && pkt->dts == pkt->pts)
1260  pkt->dts = AV_NOPTS_VALUE;
1261  }
1262 
1263  if ((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
1264  pkt->dts = AV_NOPTS_VALUE;
1265 
1266  if (pc && pc->pict_type == AV_PICTURE_TYPE_B
1267  && !st->internal->avctx->has_b_frames)
1268  //FIXME Set low_delay = 0 when has_b_frames = 1
1269  st->internal->avctx->has_b_frames = 1;
1270 
1271  /* do we have a video B-frame ? */
1272  delay = st->internal->avctx->has_b_frames;
1273  presentation_delayed = 0;
1274 
1275  /* XXX: need has_b_frame, but cannot get it if the codec is
1276  * not initialized */
1277  if (delay &&
1278  pc && pc->pict_type != AV_PICTURE_TYPE_B)
1279  presentation_delayed = 1;
1280 
1281  if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
1282  st->pts_wrap_bits < 63 &&
1283  pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
1284  if (is_relative(st->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > st->cur_dts) {
1285  pkt->dts -= 1LL << st->pts_wrap_bits;
1286  } else
1287  pkt->pts += 1LL << st->pts_wrap_bits;
1288  }
1289 
1290  /* Some MPEG-2 in MPEG-PS lack dts (issue #171 / input_file.mpg).
1291  * We take the conservative approach and discard both.
1292  * Note: If this is misbehaving for an H.264 file, then possibly
1293  * presentation_delayed is not set correctly. */
1294  if (delay == 1 && pkt->dts == pkt->pts &&
1295  pkt->dts != AV_NOPTS_VALUE && presentation_delayed) {
1296  av_log(s, AV_LOG_DEBUG, "invalid dts/pts combination %"PRIi64"\n", pkt->dts);
1297  if ( strcmp(s->iformat->name, "mov,mp4,m4a,3gp,3g2,mj2")
1298  && strcmp(s->iformat->name, "flv")) // otherwise we discard correct timestamps for vc1-wmapro.ism
1299  pkt->dts = AV_NOPTS_VALUE;
1300  }
1301 
1302  duration = av_mul_q((AVRational) {pkt->duration, 1}, st->time_base);
1303  if (pkt->duration == 0) {
1304  ff_compute_frame_duration(s, &num, &den, st, pc, pkt);
1305  if (den && num) {
1306  duration = (AVRational) {num, den};
1307  pkt->duration = av_rescale_rnd(1,
1308  num * (int64_t) st->time_base.den,
1309  den * (int64_t) st->time_base.num,
1310  AV_ROUND_DOWN);
1311  }
1312  }
1313 
1314  if (pkt->duration != 0 && (s->internal->packet_buffer || s->internal->parse_queue))
1315  update_initial_durations(s, st, pkt->stream_index, pkt->duration);
1316 
1317  /* Correct timestamps with byte offset if demuxers only have timestamps
1318  * on packet boundaries */
1319  if (pc && st->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size) {
1320  /* this will estimate bitrate based on this frame's duration and size */
1321  offset = av_rescale(pc->offset, pkt->duration, pkt->size);
1322  if (pkt->pts != AV_NOPTS_VALUE)
1323  pkt->pts += offset;
1324  if (pkt->dts != AV_NOPTS_VALUE)
1325  pkt->dts += offset;
1326  }
1327 
1328  /* This may be redundant, but it should not hurt. */
1329  if (pkt->dts != AV_NOPTS_VALUE &&
1330  pkt->pts != AV_NOPTS_VALUE &&
1331  pkt->pts > pkt->dts)
1332  presentation_delayed = 1;
1333 
1334  if (s->debug & FF_FDEBUG_TS)
1335  av_log(s, AV_LOG_DEBUG,
1336  "IN delayed:%d pts:%s, dts:%s cur_dts:%s st:%d pc:%p duration:%"PRId64" delay:%d onein_oneout:%d\n",
1337  presentation_delayed, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts),
1338  pkt->stream_index, pc, pkt->duration, delay, onein_oneout);
1339 
1340  /* Interpolate PTS and DTS if they are not present. We skip H264
1341  * currently because delay and has_b_frames are not reliably set. */
1342  if ((delay == 0 || (delay == 1 && pc)) &&
1343  onein_oneout) {
1344  if (presentation_delayed) {
1345  /* DTS = decompression timestamp */
1346  /* PTS = presentation timestamp */
1347  if (pkt->dts == AV_NOPTS_VALUE)
1348  pkt->dts = st->last_IP_pts;
1349  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1350  if (pkt->dts == AV_NOPTS_VALUE)
1351  pkt->dts = st->cur_dts;
1352 
1353  /* This is tricky: the dts must be incremented by the duration
1354  * of the frame we are displaying, i.e. the last I- or P-frame. */
1355  if (st->last_IP_duration == 0 && (uint64_t)pkt->duration <= INT32_MAX)
1356  st->last_IP_duration = pkt->duration;
1357  if (pkt->dts != AV_NOPTS_VALUE)
1358  st->cur_dts = pkt->dts + st->last_IP_duration;
1359  if (pkt->dts != AV_NOPTS_VALUE &&
1360  pkt->pts == AV_NOPTS_VALUE &&
1361  st->last_IP_duration > 0 &&
1362  ((uint64_t)st->cur_dts - (uint64_t)next_dts + 1) <= 2 &&
1363  next_dts != next_pts &&
1364  next_pts != AV_NOPTS_VALUE)
1365  pkt->pts = next_dts;
1366 
1367  if ((uint64_t)pkt->duration <= INT32_MAX)
1368  st->last_IP_duration = pkt->duration;
1369  st->last_IP_pts = pkt->pts;
1370  /* Cannot compute PTS if not present (we can compute it only
1371  * by knowing the future. */
1372  } else if (pkt->pts != AV_NOPTS_VALUE ||
1373  pkt->dts != AV_NOPTS_VALUE ||
1374  pkt->duration ) {
1375 
1376  /* presentation is not delayed : PTS and DTS are the same */
1377  if (pkt->pts == AV_NOPTS_VALUE)
1378  pkt->pts = pkt->dts;
1380  pkt->pts, pkt);
1381  if (pkt->pts == AV_NOPTS_VALUE)
1382  pkt->pts = st->cur_dts;
1383  pkt->dts = pkt->pts;
1384  if (pkt->pts != AV_NOPTS_VALUE)
1385  st->cur_dts = av_add_stable(st->time_base, pkt->pts, duration, 1);
1386  }
1387  }
1388 
1389  if (pkt->pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
1390  st->pts_buffer[0] = pkt->pts;
1391  for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
1392  FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
1393 
1395  pkt->dts = select_from_pts_buffer(st, st->pts_buffer, pkt->dts);
1396  }
1397  // We skipped it above so we try here.
1398  if (!onein_oneout)
1399  // This should happen on the first packet
1400  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1401  if (pkt->dts > st->cur_dts)
1402  st->cur_dts = pkt->dts;
1403 
1404  if (s->debug & FF_FDEBUG_TS)
1405  av_log(s, AV_LOG_DEBUG, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s st:%d (%d)\n",
1406  presentation_delayed, delay, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), st->index, st->id);
1407 
1408  /* update flags */
1410  pkt->flags |= AV_PKT_FLAG_KEY;
1411 #if FF_API_CONVERGENCE_DURATION
1413  if (pc)
1416 #endif
1417 }
1418 
1419 void ff_packet_list_free(AVPacketList **pkt_buf, AVPacketList **pkt_buf_end)
1420 {
1421  AVPacketList *tmp = *pkt_buf;
1422 
1423  while (tmp) {
1424  AVPacketList *pktl = tmp;
1425  tmp = pktl->next;
1426  av_packet_unref(&pktl->pkt);
1427  av_freep(&pktl);
1428  }
1429  *pkt_buf = NULL;
1430  *pkt_buf_end = NULL;
1431 }
1432 
1433 /**
1434  * Parse a packet, add all split parts to parse_queue.
1435  *
1436  * @param pkt Packet to parse, NULL when flushing the parser at end of stream.
1437  */
1438 static int parse_packet(AVFormatContext *s, AVPacket *pkt, int stream_index)
1439 {
1440  AVPacket out_pkt = { 0 }, flush_pkt = { 0 };
1441  AVStream *st = s->streams[stream_index];
1442  uint8_t *data = pkt ? pkt->data : NULL;
1443  int size = pkt ? pkt->size : 0;
1444  int ret = 0, got_output = 0;
1445 
1446  if (!pkt) {
1448  pkt = &flush_pkt;
1449  got_output = 1;
1450  } else if (!size && st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
1451  // preserve 0-size sync packets
1453  }
1454 
1455  while (size > 0 || (pkt == &flush_pkt && got_output)) {
1456  int len;
1457  int64_t next_pts = pkt->pts;
1458  int64_t next_dts = pkt->dts;
1459 
1460  av_init_packet(&out_pkt);
1461  len = av_parser_parse2(st->parser, st->internal->avctx,
1462  &out_pkt.data, &out_pkt.size, data, size,
1463  pkt->pts, pkt->dts, pkt->pos);
1464 
1465  pkt->pts = pkt->dts = AV_NOPTS_VALUE;
1466  pkt->pos = -1;
1467  /* increment read pointer */
1468  data += len;
1469  size -= len;
1470 
1471  got_output = !!out_pkt.size;
1472 
1473  if (!out_pkt.size)
1474  continue;
1475 
1476  if (pkt->buf && out_pkt.data == pkt->data) {
1477  /* reference pkt->buf only when out_pkt.data is guaranteed to point
1478  * to data in it and not in the parser's internal buffer. */
1479  /* XXX: Ensure this is the case with all parsers when st->parser->flags
1480  * is PARSER_FLAG_COMPLETE_FRAMES and check for that instead? */
1481  out_pkt.buf = av_buffer_ref(pkt->buf);
1482  if (!out_pkt.buf) {
1483  ret = AVERROR(ENOMEM);
1484  goto fail;
1485  }
1486  } else {
1487  ret = av_packet_make_refcounted(&out_pkt);
1488  if (ret < 0)
1489  goto fail;
1490  }
1491 
1492  if (pkt->side_data) {
1493  out_pkt.side_data = pkt->side_data;
1494  out_pkt.side_data_elems = pkt->side_data_elems;
1495  pkt->side_data = NULL;
1496  pkt->side_data_elems = 0;
1497  }
1498 
1499  /* set the duration */
1500  out_pkt.duration = (st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) ? pkt->duration : 0;
1502  if (st->internal->avctx->sample_rate > 0) {
1503  out_pkt.duration =
1505  (AVRational) { 1, st->internal->avctx->sample_rate },
1506  st->time_base,
1507  AV_ROUND_DOWN);
1508  }
1509  }
1510 
1511  out_pkt.stream_index = st->index;
1512  out_pkt.pts = st->parser->pts;
1513  out_pkt.dts = st->parser->dts;
1514  out_pkt.pos = st->parser->pos;
1515  out_pkt.flags |= pkt->flags & AV_PKT_FLAG_DISCARD;
1516 
1518  out_pkt.pos = st->parser->frame_offset;
1519 
1520  if (st->parser->key_frame == 1 ||
1521  (st->parser->key_frame == -1 &&
1523  out_pkt.flags |= AV_PKT_FLAG_KEY;
1524 
1525  if (st->parser->key_frame == -1 && st->parser->pict_type ==AV_PICTURE_TYPE_NONE && (pkt->flags&AV_PKT_FLAG_KEY))
1526  out_pkt.flags |= AV_PKT_FLAG_KEY;
1527 
1528  compute_pkt_fields(s, st, st->parser, &out_pkt, next_dts, next_pts);
1529 
1532  &out_pkt, 0);
1533  if (ret < 0) {
1534  av_packet_unref(&out_pkt);
1535  goto fail;
1536  }
1537  }
1538 
1539  /* end of the stream => close and free the parser */
1540  if (pkt == &flush_pkt) {
1541  av_parser_close(st->parser);
1542  st->parser = NULL;
1543  }
1544 
1545 fail:
1546  av_packet_unref(pkt);
1547  return ret;
1548 }
1549 
1551  AVPacketList **pkt_buffer_end,
1552  AVPacket *pkt)
1553 {
1554  AVPacketList *pktl;
1555  av_assert0(*pkt_buffer);
1556  pktl = *pkt_buffer;
1557  *pkt = pktl->pkt;
1558  *pkt_buffer = pktl->next;
1559  if (!pktl->next)
1560  *pkt_buffer_end = NULL;
1561  av_freep(&pktl);
1562  return 0;
1563 }
1564 
1565 static int64_t ts_to_samples(AVStream *st, int64_t ts)
1566 {
1567  return av_rescale(ts, st->time_base.num * st->codecpar->sample_rate, st->time_base.den);
1568 }
1569 
1571 {
1572  int ret = 0, i, got_packet = 0;
1573  AVDictionary *metadata = NULL;
1574 
1575  av_init_packet(pkt);
1576 
1577  while (!got_packet && !s->internal->parse_queue) {
1578  AVStream *st;
1579  AVPacket cur_pkt;
1580 
1581  /* read next packet */
1582  ret = ff_read_packet(s, &cur_pkt);
1583  if (ret < 0) {
1584  if (ret == AVERROR(EAGAIN))
1585  return ret;
1586  /* flush the parsers */
1587  for (i = 0; i < s->nb_streams; i++) {
1588  st = s->streams[i];
1589  if (st->parser && st->need_parsing)
1590  parse_packet(s, NULL, st->index);
1591  }
1592  /* all remaining packets are now in parse_queue =>
1593  * really terminate parsing */
1594  break;
1595  }
1596  ret = 0;
1597  st = s->streams[cur_pkt.stream_index];
1598 
1599  /* update context if required */
1600  if (st->internal->need_context_update) {
1601  if (avcodec_is_open(st->internal->avctx)) {
1602  av_log(s, AV_LOG_DEBUG, "Demuxer context update while decoder is open, closing and trying to re-open\n");
1604  st->info->found_decoder = 0;
1605  }
1606 
1607  /* close parser, because it depends on the codec */
1608  if (st->parser && st->internal->avctx->codec_id != st->codecpar->codec_id) {
1609  av_parser_close(st->parser);
1610  st->parser = NULL;
1611  }
1612 
1614  if (ret < 0)
1615  return ret;
1616 
1617 #if FF_API_LAVF_AVCTX
1619  /* update deprecated public codec context */
1620  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
1621  if (ret < 0)
1622  return ret;
1624 #endif
1625 
1626  st->internal->need_context_update = 0;
1627  }
1628 
1629  if (cur_pkt.pts != AV_NOPTS_VALUE &&
1630  cur_pkt.dts != AV_NOPTS_VALUE &&
1631  cur_pkt.pts < cur_pkt.dts) {
1633  "Invalid timestamps stream=%d, pts=%s, dts=%s, size=%d\n",
1634  cur_pkt.stream_index,
1635  av_ts2str(cur_pkt.pts),
1636  av_ts2str(cur_pkt.dts),
1637  cur_pkt.size);
1638  }
1639  if (s->debug & FF_FDEBUG_TS)
1640  av_log(s, AV_LOG_DEBUG,
1641  "ff_read_packet stream=%d, pts=%s, dts=%s, size=%d, duration=%"PRId64", flags=%d\n",
1642  cur_pkt.stream_index,
1643  av_ts2str(cur_pkt.pts),
1644  av_ts2str(cur_pkt.dts),
1645  cur_pkt.size, cur_pkt.duration, cur_pkt.flags);
1646 
1647  if (st->need_parsing && !st->parser && !(s->flags & AVFMT_FLAG_NOPARSE)) {
1648  st->parser = av_parser_init(st->codecpar->codec_id);
1649  if (!st->parser) {
1650  av_log(s, AV_LOG_VERBOSE, "parser not found for codec "
1651  "%s, packets or times may be invalid.\n",
1653  /* no parser available: just output the raw packets */
1655  } else if (st->need_parsing == AVSTREAM_PARSE_HEADERS)
1657  else if (st->need_parsing == AVSTREAM_PARSE_FULL_ONCE)
1658  st->parser->flags |= PARSER_FLAG_ONCE;
1659  else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW)
1661  }
1662 
1663  if (!st->need_parsing || !st->parser) {
1664  /* no parsing needed: we just output the packet as is */
1665  *pkt = cur_pkt;
1667  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) &&
1668  (pkt->flags & AV_PKT_FLAG_KEY) && pkt->dts != AV_NOPTS_VALUE) {
1669  ff_reduce_index(s, st->index);
1670  av_add_index_entry(st, pkt->pos, pkt->dts,
1671  0, 0, AVINDEX_KEYFRAME);
1672  }
1673  got_packet = 1;
1674  } else if (st->discard < AVDISCARD_ALL) {
1675  if ((ret = parse_packet(s, &cur_pkt, cur_pkt.stream_index)) < 0)
1676  return ret;
1678  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
1679  st->codecpar->channels = st->internal->avctx->channels;
1681  st->codecpar->codec_id = st->internal->avctx->codec_id;
1682  } else {
1683  /* free packet */
1684  av_packet_unref(&cur_pkt);
1685  }
1686  if (pkt->flags & AV_PKT_FLAG_KEY)
1687  st->skip_to_keyframe = 0;
1688  if (st->skip_to_keyframe) {
1689  av_packet_unref(&cur_pkt);
1690  if (got_packet) {
1691  *pkt = cur_pkt;
1692  }
1693  got_packet = 0;
1694  }
1695  }
1696 
1697  if (!got_packet && s->internal->parse_queue)
1699 
1700  if (ret >= 0) {
1701  AVStream *st = s->streams[pkt->stream_index];
1702  int discard_padding = 0;
1703  if (st->first_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
1704  int64_t pts = pkt->pts - (is_relative(pkt->pts) ? RELATIVE_TS_BASE : 0);
1705  int64_t sample = ts_to_samples(st, pts);
1706  int duration = ts_to_samples(st, pkt->duration);
1707  int64_t end_sample = sample + duration;
1708  if (duration > 0 && end_sample >= st->first_discard_sample &&
1709  sample < st->last_discard_sample)
1710  discard_padding = FFMIN(end_sample - st->first_discard_sample, duration);
1711  }
1712  if (st->start_skip_samples && (pkt->pts == 0 || pkt->pts == RELATIVE_TS_BASE))
1713  st->skip_samples = st->start_skip_samples;
1714  if (st->skip_samples || discard_padding) {
1716  if (p) {
1717  AV_WL32(p, st->skip_samples);
1718  AV_WL32(p + 4, discard_padding);
1719  av_log(s, AV_LOG_DEBUG, "demuxer injecting skip %d / discard %d\n", st->skip_samples, discard_padding);
1720  }
1721  st->skip_samples = 0;
1722  }
1723 
1724  if (st->inject_global_side_data) {
1725  for (i = 0; i < st->nb_side_data; i++) {
1726  AVPacketSideData *src_sd = &st->side_data[i];
1727  uint8_t *dst_data;
1728 
1729  if (av_packet_get_side_data(pkt, src_sd->type, NULL))
1730  continue;
1731 
1732  dst_data = av_packet_new_side_data(pkt, src_sd->type, src_sd->size);
1733  if (!dst_data) {
1734  av_log(s, AV_LOG_WARNING, "Could not inject global side data\n");
1735  continue;
1736  }
1737 
1738  memcpy(dst_data, src_sd->data, src_sd->size);
1739  }
1740  st->inject_global_side_data = 0;
1741  }
1742  }
1743 
1744  av_opt_get_dict_val(s, "metadata", AV_OPT_SEARCH_CHILDREN, &metadata);
1745  if (metadata) {
1747  av_dict_copy(&s->metadata, metadata, 0);
1748  av_dict_free(&metadata);
1750  }
1751 
1752 #if FF_API_LAVF_AVCTX
1754 #endif
1755 
1756  if (s->debug & FF_FDEBUG_TS)
1757  av_log(s, AV_LOG_DEBUG,
1758  "read_frame_internal stream=%d, pts=%s, dts=%s, "
1759  "size=%d, duration=%"PRId64", flags=%d\n",
1760  pkt->stream_index,
1761  av_ts2str(pkt->pts),
1762  av_ts2str(pkt->dts),
1763  pkt->size, pkt->duration, pkt->flags);
1764 
1765  return ret;
1766 }
1767 
1769 {
1770  const int genpts = s->flags & AVFMT_FLAG_GENPTS;
1771  int eof = 0;
1772  int ret;
1773  AVStream *st;
1774 
1775  if (!genpts) {
1776  ret = s->internal->packet_buffer
1778  &s->internal->packet_buffer_end, pkt)
1779  : read_frame_internal(s, pkt);
1780  if (ret < 0)
1781  return ret;
1782  goto return_packet;
1783  }
1784 
1785  for (;;) {
1786  AVPacketList *pktl = s->internal->packet_buffer;
1787 
1788  if (pktl) {
1789  AVPacket *next_pkt = &pktl->pkt;
1790 
1791  if (next_pkt->dts != AV_NOPTS_VALUE) {
1792  int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits;
1793  // last dts seen for this stream. if any of packets following
1794  // current one had no dts, we will set this to AV_NOPTS_VALUE.
1795  int64_t last_dts = next_pkt->dts;
1796  av_assert2(wrap_bits <= 64);
1797  while (pktl && next_pkt->pts == AV_NOPTS_VALUE) {
1798  if (pktl->pkt.stream_index == next_pkt->stream_index &&
1799  av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2ULL << (wrap_bits - 1)) < 0) {
1800  if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2ULL << (wrap_bits - 1))) {
1801  // not B-frame
1802  next_pkt->pts = pktl->pkt.dts;
1803  }
1804  if (last_dts != AV_NOPTS_VALUE) {
1805  // Once last dts was set to AV_NOPTS_VALUE, we don't change it.
1806  last_dts = pktl->pkt.dts;
1807  }
1808  }
1809  pktl = pktl->next;
1810  }
1811  if (eof && next_pkt->pts == AV_NOPTS_VALUE && last_dts != AV_NOPTS_VALUE) {
1812  // Fixing the last reference frame had none pts issue (For MXF etc).
1813  // We only do this when
1814  // 1. eof.
1815  // 2. we are not able to resolve a pts value for current packet.
1816  // 3. the packets for this stream at the end of the files had valid dts.
1817  next_pkt->pts = last_dts + next_pkt->duration;
1818  }
1819  pktl = s->internal->packet_buffer;
1820  }
1821 
1822  /* read packet from packet buffer, if there is data */
1823  st = s->streams[next_pkt->stream_index];
1824  if (!(next_pkt->pts == AV_NOPTS_VALUE && st->discard < AVDISCARD_ALL &&
1825  next_pkt->dts != AV_NOPTS_VALUE && !eof)) {
1827  &s->internal->packet_buffer_end, pkt);
1828  goto return_packet;
1829  }
1830  }
1831 
1832  ret = read_frame_internal(s, pkt);
1833  if (ret < 0) {
1834  if (pktl && ret != AVERROR(EAGAIN)) {
1835  eof = 1;
1836  continue;
1837  } else
1838  return ret;
1839  }
1840 
1844  av_packet_unref(pkt);
1845  if (ret < 0)
1846  return ret;
1847  }
1848 
1849 return_packet:
1850 
1851  st = s->streams[pkt->stream_index];
1852  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & AV_PKT_FLAG_KEY) {
1853  ff_reduce_index(s, st->index);
1854  av_add_index_entry(st, pkt->pos, pkt->dts, 0, 0, AVINDEX_KEYFRAME);
1855  }
1856 
1857  if (is_relative(pkt->dts))
1858  pkt->dts -= RELATIVE_TS_BASE;
1859  if (is_relative(pkt->pts))
1860  pkt->pts -= RELATIVE_TS_BASE;
1861 
1862  return ret;
1863 }
1864 
1865 /* XXX: suppress the packet queue */
1867 {
1868  if (!s->internal)
1869  return;
1873 
1875 }
1876 
1877 /*******************************************************/
1878 /* seek support */
1879 
1881 {
1882  int i;
1883  AVStream *st;
1884  int best_stream = 0;
1885  int best_score = INT_MIN;
1886 
1887  if (s->nb_streams <= 0)
1888  return -1;
1889  for (i = 0; i < s->nb_streams; i++) {
1890  int score = 0;
1891  st = s->streams[i];
1892  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1894  score -= 400;
1895  if (st->codecpar->width && st->codecpar->height)
1896  score += 50;
1897  score+= 25;
1898  }
1899  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
1900  if (st->codecpar->sample_rate)
1901  score += 50;
1902  }
1903  if (st->codec_info_nb_frames)
1904  score += 12;
1905 
1906  if (st->discard != AVDISCARD_ALL)
1907  score += 200;
1908 
1909  if (score > best_score) {
1910  best_score = score;
1911  best_stream = i;
1912  }
1913  }
1914  return best_stream;
1915 }
1916 
1917 /** Flush the frame reader. */
1919 {
1920  AVStream *st;
1921  int i, j;
1922 
1923  flush_packet_queue(s);
1924 
1925  /* Reset read state for each stream. */
1926  for (i = 0; i < s->nb_streams; i++) {
1927  st = s->streams[i];
1928 
1929  if (st->parser) {
1930  av_parser_close(st->parser);
1931  st->parser = NULL;
1932  }
1935  if (st->first_dts == AV_NOPTS_VALUE)
1936  st->cur_dts = RELATIVE_TS_BASE;
1937  else
1938  /* We set the current DTS to an unspecified origin. */
1939  st->cur_dts = AV_NOPTS_VALUE;
1940 
1942 
1943  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
1944  st->pts_buffer[j] = AV_NOPTS_VALUE;
1945 
1947  st->inject_global_side_data = 1;
1948 
1949  st->skip_samples = 0;
1950  }
1951 }
1952 
1953 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
1954 {
1955  int i;
1956 
1957  for (i = 0; i < s->nb_streams; i++) {
1958  AVStream *st = s->streams[i];
1959 
1960  st->cur_dts =
1961  av_rescale(timestamp,
1962  st->time_base.den * (int64_t) ref_st->time_base.num,
1963  st->time_base.num * (int64_t) ref_st->time_base.den);
1964  }
1965 }
1966 
1967 void ff_reduce_index(AVFormatContext *s, int stream_index)
1968 {
1969  AVStream *st = s->streams[stream_index];
1970  unsigned int max_entries = s->max_index_size / sizeof(AVIndexEntry);
1971 
1972  if ((unsigned) st->nb_index_entries >= max_entries) {
1973  int i;
1974  for (i = 0; 2 * i < st->nb_index_entries; i++)
1975  st->index_entries[i] = st->index_entries[2 * i];
1976  st->nb_index_entries = i;
1977  }
1978 }
1979 
1980 int ff_add_index_entry(AVIndexEntry **index_entries,
1981  int *nb_index_entries,
1982  unsigned int *index_entries_allocated_size,
1983  int64_t pos, int64_t timestamp,
1984  int size, int distance, int flags)
1985 {
1986  AVIndexEntry *entries, *ie;
1987  int index;
1988 
1989  if ((unsigned) *nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
1990  return -1;
1991 
1992  if (timestamp == AV_NOPTS_VALUE)
1993  return AVERROR(EINVAL);
1994 
1995  if (size < 0 || size > 0x3FFFFFFF)
1996  return AVERROR(EINVAL);
1997 
1998  if (is_relative(timestamp)) //FIXME this maintains previous behavior but we should shift by the correct offset once known
1999  timestamp -= RELATIVE_TS_BASE;
2000 
2001  entries = av_fast_realloc(*index_entries,
2002  index_entries_allocated_size,
2003  (*nb_index_entries + 1) *
2004  sizeof(AVIndexEntry));
2005  if (!entries)
2006  return -1;
2007 
2008  *index_entries = entries;
2009 
2010  index = ff_index_search_timestamp(*index_entries, *nb_index_entries,
2011  timestamp, AVSEEK_FLAG_ANY);
2012 
2013  if (index < 0) {
2014  index = (*nb_index_entries)++;
2015  ie = &entries[index];
2016  av_assert0(index == 0 || ie[-1].timestamp < timestamp);
2017  } else {
2018  ie = &entries[index];
2019  if (ie->timestamp != timestamp) {
2020  if (ie->timestamp <= timestamp)
2021  return -1;
2022  memmove(entries + index + 1, entries + index,
2023  sizeof(AVIndexEntry) * (*nb_index_entries - index));
2024  (*nb_index_entries)++;
2025  } else if (ie->pos == pos && distance < ie->min_distance)
2026  // do not reduce the distance
2027  distance = ie->min_distance;
2028  }
2029 
2030  ie->pos = pos;
2031  ie->timestamp = timestamp;
2032  ie->min_distance = distance;
2033  ie->size = size;
2034  ie->flags = flags;
2035 
2036  return index;
2037 }
2038 
2039 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
2040  int size, int distance, int flags)
2041 {
2042  timestamp = wrap_timestamp(st, timestamp);
2044  &st->index_entries_allocated_size, pos,
2045  timestamp, size, distance, flags);
2046 }
2047 
2048 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
2049  int64_t wanted_timestamp, int flags)
2050 {
2051  int a, b, m;
2052  int64_t timestamp;
2053 
2054  a = -1;
2055  b = nb_entries;
2056 
2057  // Optimize appending index entries at the end.
2058  if (b && entries[b - 1].timestamp < wanted_timestamp)
2059  a = b - 1;
2060 
2061  while (b - a > 1) {
2062  m = (a + b) >> 1;
2063 
2064  // Search for the next non-discarded packet.
2065  while ((entries[m].flags & AVINDEX_DISCARD_FRAME) && m < b && m < nb_entries - 1) {
2066  m++;
2067  if (m == b && entries[m].timestamp >= wanted_timestamp) {
2068  m = b - 1;
2069  break;
2070  }
2071  }
2072 
2073  timestamp = entries[m].timestamp;
2074  if (timestamp >= wanted_timestamp)
2075  b = m;
2076  if (timestamp <= wanted_timestamp)
2077  a = m;
2078  }
2079  m = (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
2080 
2081  if (!(flags & AVSEEK_FLAG_ANY))
2082  while (m >= 0 && m < nb_entries &&
2083  !(entries[m].flags & AVINDEX_KEYFRAME))
2084  m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
2085 
2086  if (m == nb_entries)
2087  return -1;
2088  return m;
2089 }
2090 
2091 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
2092 {
2093  int ist1, ist2;
2094  int64_t pos_delta = 0;
2095  int64_t skip = 0;
2096  //We could use URLProtocol flags here but as many user applications do not use URLProtocols this would be unreliable
2097  const char *proto = avio_find_protocol_name(s->url);
2098 
2099  if (!proto) {
2100  av_log(s, AV_LOG_INFO,
2101  "Protocol name not provided, cannot determine if input is local or "
2102  "a network protocol, buffers and access patterns cannot be configured "
2103  "optimally without knowing the protocol\n");
2104  }
2105 
2106  if (proto && !(strcmp(proto, "file") && strcmp(proto, "pipe") && strcmp(proto, "cache")))
2107  return;
2108 
2109  for (ist1 = 0; ist1 < s->nb_streams; ist1++) {
2110  AVStream *st1 = s->streams[ist1];
2111  for (ist2 = 0; ist2 < s->nb_streams; ist2++) {
2112  AVStream *st2 = s->streams[ist2];
2113  int i1, i2;
2114 
2115  if (ist1 == ist2)
2116  continue;
2117 
2118  for (i1 = i2 = 0; i1 < st1->nb_index_entries; i1++) {
2119  AVIndexEntry *e1 = &st1->index_entries[i1];
2120  int64_t e1_pts = av_rescale_q(e1->timestamp, st1->time_base, AV_TIME_BASE_Q);
2121 
2122  skip = FFMAX(skip, e1->size);
2123  for (; i2 < st2->nb_index_entries; i2++) {
2124  AVIndexEntry *e2 = &st2->index_entries[i2];
2125  int64_t e2_pts = av_rescale_q(e2->timestamp, st2->time_base, AV_TIME_BASE_Q);
2126  if (e2_pts - e1_pts < time_tolerance)
2127  continue;
2128  pos_delta = FFMAX(pos_delta, e1->pos - e2->pos);
2129  break;
2130  }
2131  }
2132  }
2133  }
2134 
2135  pos_delta *= 2;
2136  /* XXX This could be adjusted depending on protocol*/
2137  if (s->pb->buffer_size < pos_delta && pos_delta < (1<<24)) {
2138  av_log(s, AV_LOG_VERBOSE, "Reconfiguring buffers to size %"PRId64"\n", pos_delta);
2139 
2140  /* realloc the buffer and the original data will be retained */
2141  if (ffio_realloc_buf(s->pb, pos_delta)) {
2142  av_log(s, AV_LOG_ERROR, "Realloc buffer fail.\n");
2143  return;
2144  }
2145 
2146  s->pb->short_seek_threshold = FFMAX(s->pb->short_seek_threshold, pos_delta/2);
2147  }
2148 
2149  if (skip < (1<<23)) {
2151  }
2152 }
2153 
2154 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp, int flags)
2155 {
2157  wanted_timestamp, flags);
2158 }
2159 
2160 static int64_t ff_read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit,
2161  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2162 {
2163  int64_t ts = read_timestamp(s, stream_index, ppos, pos_limit);
2164  if (stream_index >= 0)
2165  ts = wrap_timestamp(s->streams[stream_index], ts);
2166  return ts;
2167 }
2168 
2169 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
2170  int64_t target_ts, int flags)
2171 {
2172  const AVInputFormat *avif = s->iformat;
2173  int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;
2174  int64_t ts_min, ts_max, ts;
2175  int index;
2176  int64_t ret;
2177  AVStream *st;
2178 
2179  if (stream_index < 0)
2180  return -1;
2181 
2182  av_log(s, AV_LOG_TRACE, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2183 
2184  ts_max =
2185  ts_min = AV_NOPTS_VALUE;
2186  pos_limit = -1; // GCC falsely says it may be uninitialized.
2187 
2188  st = s->streams[stream_index];
2189  if (st->index_entries) {
2190  AVIndexEntry *e;
2191 
2192  /* FIXME: Whole function must be checked for non-keyframe entries in
2193  * index case, especially read_timestamp(). */
2194  index = av_index_search_timestamp(st, target_ts,
2195  flags | AVSEEK_FLAG_BACKWARD);
2196  index = FFMAX(index, 0);
2197  e = &st->index_entries[index];
2198 
2199  if (e->timestamp <= target_ts || e->pos == e->min_distance) {
2200  pos_min = e->pos;
2201  ts_min = e->timestamp;
2202  av_log(s, AV_LOG_TRACE, "using cached pos_min=0x%"PRIx64" dts_min=%s\n",
2203  pos_min, av_ts2str(ts_min));
2204  } else {
2205  av_assert1(index == 0);
2206  }
2207 
2208  index = av_index_search_timestamp(st, target_ts,
2209  flags & ~AVSEEK_FLAG_BACKWARD);
2210  av_assert0(index < st->nb_index_entries);
2211  if (index >= 0) {
2212  e = &st->index_entries[index];
2213  av_assert1(e->timestamp >= target_ts);
2214  pos_max = e->pos;
2215  ts_max = e->timestamp;
2216  pos_limit = pos_max - e->min_distance;
2217  av_log(s, AV_LOG_TRACE, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64
2218  " dts_max=%s\n", pos_max, pos_limit, av_ts2str(ts_max));
2219  }
2220  }
2221 
2222  pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
2223  ts_min, ts_max, flags, &ts, avif->read_timestamp);
2224  if (pos < 0)
2225  return -1;
2226 
2227  /* do the seek */
2228  if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
2229  return ret;
2230 
2232  ff_update_cur_dts(s, st, ts);
2233 
2234  return 0;
2235 }
2236 
2237 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
2238  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2239 {
2240  int64_t step = 1024;
2241  int64_t limit, ts_max;
2242  int64_t filesize = avio_size(s->pb);
2243  int64_t pos_max = filesize - 1;
2244  do {
2245  limit = pos_max;
2246  pos_max = FFMAX(0, (pos_max) - step);
2247  ts_max = ff_read_timestamp(s, stream_index,
2248  &pos_max, limit, read_timestamp);
2249  step += step;
2250  } while (ts_max == AV_NOPTS_VALUE && 2*limit > step);
2251  if (ts_max == AV_NOPTS_VALUE)
2252  return -1;
2253 
2254  for (;;) {
2255  int64_t tmp_pos = pos_max + 1;
2256  int64_t tmp_ts = ff_read_timestamp(s, stream_index,
2257  &tmp_pos, INT64_MAX, read_timestamp);
2258  if (tmp_ts == AV_NOPTS_VALUE)
2259  break;
2260  av_assert0(tmp_pos > pos_max);
2261  ts_max = tmp_ts;
2262  pos_max = tmp_pos;
2263  if (tmp_pos >= filesize)
2264  break;
2265  }
2266 
2267  if (ts)
2268  *ts = ts_max;
2269  if (pos)
2270  *pos = pos_max;
2271 
2272  return 0;
2273 }
2274 
2275 int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts,
2276  int64_t pos_min, int64_t pos_max, int64_t pos_limit,
2277  int64_t ts_min, int64_t ts_max,
2278  int flags, int64_t *ts_ret,
2279  int64_t (*read_timestamp)(struct AVFormatContext *, int,
2280  int64_t *, int64_t))
2281 {
2282  int64_t pos, ts;
2283  int64_t start_pos;
2284  int no_change;
2285  int ret;
2286 
2287  av_log(s, AV_LOG_TRACE, "gen_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2288 
2289  if (ts_min == AV_NOPTS_VALUE) {
2290  pos_min = s->internal->data_offset;
2291  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2292  if (ts_min == AV_NOPTS_VALUE)
2293  return -1;
2294  }
2295 
2296  if (ts_min >= target_ts) {
2297  *ts_ret = ts_min;
2298  return pos_min;
2299  }
2300 
2301  if (ts_max == AV_NOPTS_VALUE) {
2302  if ((ret = ff_find_last_ts(s, stream_index, &ts_max, &pos_max, read_timestamp)) < 0)
2303  return ret;
2304  pos_limit = pos_max;
2305  }
2306 
2307  if (ts_max <= target_ts) {
2308  *ts_ret = ts_max;
2309  return pos_max;
2310  }
2311 
2312  av_assert0(ts_min < ts_max);
2313 
2314  no_change = 0;
2315  while (pos_min < pos_limit) {
2316  av_log(s, AV_LOG_TRACE,
2317  "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%s dts_max=%s\n",
2318  pos_min, pos_max, av_ts2str(ts_min), av_ts2str(ts_max));
2319  av_assert0(pos_limit <= pos_max);
2320 
2321  if (no_change == 0) {
2322  int64_t approximate_keyframe_distance = pos_max - pos_limit;
2323  // interpolate position (better than dichotomy)
2324  pos = av_rescale(target_ts - ts_min, pos_max - pos_min,
2325  ts_max - ts_min) +
2326  pos_min - approximate_keyframe_distance;
2327  } else if (no_change == 1) {
2328  // bisection if interpolation did not change min / max pos last time
2329  pos = (pos_min + pos_limit) >> 1;
2330  } else {
2331  /* linear search if bisection failed, can only happen if there
2332  * are very few or no keyframes between min/max */
2333  pos = pos_min;
2334  }
2335  if (pos <= pos_min)
2336  pos = pos_min + 1;
2337  else if (pos > pos_limit)
2338  pos = pos_limit;
2339  start_pos = pos;
2340 
2341  // May pass pos_limit instead of -1.
2342  ts = ff_read_timestamp(s, stream_index, &pos, INT64_MAX, read_timestamp);
2343  if (pos == pos_max)
2344  no_change++;
2345  else
2346  no_change = 0;
2347  av_log(s, AV_LOG_TRACE, "%"PRId64" %"PRId64" %"PRId64" / %s %s %s"
2348  " target:%s limit:%"PRId64" start:%"PRId64" noc:%d\n",
2349  pos_min, pos, pos_max,
2350  av_ts2str(ts_min), av_ts2str(ts), av_ts2str(ts_max), av_ts2str(target_ts),
2351  pos_limit, start_pos, no_change);
2352  if (ts == AV_NOPTS_VALUE) {
2353  av_log(s, AV_LOG_ERROR, "read_timestamp() failed in the middle\n");
2354  return -1;
2355  }
2356  if (target_ts <= ts) {
2357  pos_limit = start_pos - 1;
2358  pos_max = pos;
2359  ts_max = ts;
2360  }
2361  if (target_ts >= ts) {
2362  pos_min = pos;
2363  ts_min = ts;
2364  }
2365  }
2366 
2367  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
2368  ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
2369 #if 0
2370  pos_min = pos;
2371  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2372  pos_min++;
2373  ts_max = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2374  av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" %s<=%s<=%s\n",
2375  pos, av_ts2str(ts_min), av_ts2str(target_ts), av_ts2str(ts_max));
2376 #endif
2377  *ts_ret = ts;
2378  return pos;
2379 }
2380 
2381 static int seek_frame_byte(AVFormatContext *s, int stream_index,
2382  int64_t pos, int flags)
2383 {
2384  int64_t pos_min, pos_max;
2385 
2386  pos_min = s->internal->data_offset;
2387  pos_max = avio_size(s->pb) - 1;
2388 
2389  if (pos < pos_min)
2390  pos = pos_min;
2391  else if (pos > pos_max)
2392  pos = pos_max;
2393 
2394  avio_seek(s->pb, pos, SEEK_SET);
2395 
2396  s->io_repositioned = 1;
2397 
2398  return 0;
2399 }
2400 
2401 static int seek_frame_generic(AVFormatContext *s, int stream_index,
2402  int64_t timestamp, int flags)
2403 {
2404  int index;
2405  int64_t ret;
2406  AVStream *st;
2407  AVIndexEntry *ie;
2408 
2409  st = s->streams[stream_index];
2410 
2411  index = av_index_search_timestamp(st, timestamp, flags);
2412 
2413  if (index < 0 && st->nb_index_entries &&
2414  timestamp < st->index_entries[0].timestamp)
2415  return -1;
2416 
2417  if (index < 0 || index == st->nb_index_entries - 1) {
2418  AVPacket pkt;
2419  int nonkey = 0;
2420 
2421  if (st->nb_index_entries) {
2423  ie = &st->index_entries[st->nb_index_entries - 1];
2424  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2425  return ret;
2426  ff_update_cur_dts(s, st, ie->timestamp);
2427  } else {
2428  if ((ret = avio_seek(s->pb, s->internal->data_offset, SEEK_SET)) < 0)
2429  return ret;
2430  }
2431  for (;;) {
2432  int read_status;
2433  do {
2434  read_status = av_read_frame(s, &pkt);
2435  } while (read_status == AVERROR(EAGAIN));
2436  if (read_status < 0)
2437  break;
2438  if (stream_index == pkt.stream_index && pkt.dts > timestamp) {
2439  if (pkt.flags & AV_PKT_FLAG_KEY) {
2440  av_packet_unref(&pkt);
2441  break;
2442  }
2443  if (nonkey++ > 1000 && st->codecpar->codec_id != AV_CODEC_ID_CDGRAPHICS) {
2444  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);
2445  av_packet_unref(&pkt);
2446  break;
2447  }
2448  }
2449  av_packet_unref(&pkt);
2450  }
2451  index = av_index_search_timestamp(st, timestamp, flags);
2452  }
2453  if (index < 0)
2454  return -1;
2455 
2457  if (s->iformat->read_seek)
2458  if (s->iformat->read_seek(s, stream_index, timestamp, flags) >= 0)
2459  return 0;
2460  ie = &st->index_entries[index];
2461  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2462  return ret;
2463  ff_update_cur_dts(s, st, ie->timestamp);
2464 
2465  return 0;
2466 }
2467 
2468 static int seek_frame_internal(AVFormatContext *s, int stream_index,
2469  int64_t timestamp, int flags)
2470 {
2471  int ret;
2472  AVStream *st;
2473 
2474  if (flags & AVSEEK_FLAG_BYTE) {
2475  if (s->iformat->flags & AVFMT_NO_BYTE_SEEK)
2476  return -1;
2478  return seek_frame_byte(s, stream_index, timestamp, flags);
2479  }
2480 
2481  if (stream_index < 0) {
2482  stream_index = av_find_default_stream_index(s);
2483  if (stream_index < 0)
2484  return -1;
2485 
2486  st = s->streams[stream_index];
2487  /* timestamp for default must be expressed in AV_TIME_BASE units */
2488  timestamp = av_rescale(timestamp, st->time_base.den,
2489  AV_TIME_BASE * (int64_t) st->time_base.num);
2490  }
2491 
2492  /* first, we try the format specific seek */
2493  if (s->iformat->read_seek) {
2495  ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
2496  } else
2497  ret = -1;
2498  if (ret >= 0)
2499  return 0;
2500 
2501  if (s->iformat->read_timestamp &&
2502  !(s->iformat->flags & AVFMT_NOBINSEARCH)) {
2504  return ff_seek_frame_binary(s, stream_index, timestamp, flags);
2505  } else if (!(s->iformat->flags & AVFMT_NOGENSEARCH)) {
2507  return seek_frame_generic(s, stream_index, timestamp, flags);
2508  } else
2509  return -1;
2510 }
2511 
2512 int av_seek_frame(AVFormatContext *s, int stream_index,
2513  int64_t timestamp, int flags)
2514 {
2515  int ret;
2516 
2517  if (s->iformat->read_seek2 && !s->iformat->read_seek) {
2518  int64_t min_ts = INT64_MIN, max_ts = INT64_MAX;
2519  if ((flags & AVSEEK_FLAG_BACKWARD))
2520  max_ts = timestamp;
2521  else
2522  min_ts = timestamp;
2523  return avformat_seek_file(s, stream_index, min_ts, timestamp, max_ts,
2524  flags & ~AVSEEK_FLAG_BACKWARD);
2525  }
2526 
2527  ret = seek_frame_internal(s, stream_index, timestamp, flags);
2528 
2529  if (ret >= 0)
2531 
2532  return ret;
2533 }
2534 
2535 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
2536  int64_t ts, int64_t max_ts, int flags)
2537 {
2538  if (min_ts > ts || max_ts < ts)
2539  return -1;
2540  if (stream_index < -1 || stream_index >= (int)s->nb_streams)
2541  return AVERROR(EINVAL);
2542 
2543  if (s->seek2any>0)
2544  flags |= AVSEEK_FLAG_ANY;
2545  flags &= ~AVSEEK_FLAG_BACKWARD;
2546 
2547  if (s->iformat->read_seek2) {
2548  int ret;
2550 
2551  if (stream_index == -1 && s->nb_streams == 1) {
2552  AVRational time_base = s->streams[0]->time_base;
2553  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
2554  min_ts = av_rescale_rnd(min_ts, time_base.den,
2555  time_base.num * (int64_t)AV_TIME_BASE,
2557  max_ts = av_rescale_rnd(max_ts, time_base.den,
2558  time_base.num * (int64_t)AV_TIME_BASE,
2560  stream_index = 0;
2561  }
2562 
2563  ret = s->iformat->read_seek2(s, stream_index, min_ts,
2564  ts, max_ts, flags);
2565 
2566  if (ret >= 0)
2568  return ret;
2569  }
2570 
2571  if (s->iformat->read_timestamp) {
2572  // try to seek via read_timestamp()
2573  }
2574 
2575  // Fall back on old API if new is not implemented but old is.
2576  // Note the old API has somewhat different semantics.
2577  if (s->iformat->read_seek || 1) {
2578  int dir = (ts - (uint64_t)min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);
2579  int ret = av_seek_frame(s, stream_index, ts, flags | dir);
2580  if (ret<0 && ts != min_ts && max_ts != ts) {
2581  ret = av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);
2582  if (ret >= 0)
2583  ret = av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));
2584  }
2585  return ret;
2586  }
2587 
2588  // try some generic seek like seek_frame_generic() but with new ts semantics
2589  return -1; //unreachable
2590 }
2591 
2593 {
2595  return 0;
2596 }
2597 
2598 /*******************************************************/
2599 
2600 /**
2601  * Return TRUE if the stream has accurate duration in any stream.
2602  *
2603  * @return TRUE if the stream has accurate duration for at least one component.
2604  */
2606 {
2607  int i;
2608  AVStream *st;
2609 
2610  for (i = 0; i < ic->nb_streams; i++) {
2611  st = ic->streams[i];
2612  if (st->duration != AV_NOPTS_VALUE)
2613  return 1;
2614  }
2615  if (ic->duration != AV_NOPTS_VALUE)
2616  return 1;
2617  return 0;
2618 }
2619 
2620 /**
2621  * Estimate the stream timings from the one of each components.
2622  *
2623  * Also computes the global bitrate if possible.
2624  */
2626 {
2627  int64_t start_time, start_time1, start_time_text, end_time, end_time1, end_time_text;
2628  int64_t duration, duration1, duration_text, filesize;
2629  int i;
2630  AVProgram *p;
2631 
2632  start_time = INT64_MAX;
2633  start_time_text = INT64_MAX;
2634  end_time = INT64_MIN;
2635  end_time_text = INT64_MIN;
2636  duration = INT64_MIN;
2637  duration_text = INT64_MIN;
2638 
2639  for (i = 0; i < ic->nb_streams; i++) {
2640  AVStream *st = ic->streams[i];
2641  int is_text = st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ||
2643  if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
2644  start_time1 = av_rescale_q(st->start_time, st->time_base,
2645  AV_TIME_BASE_Q);
2646  if (is_text)
2647  start_time_text = FFMIN(start_time_text, start_time1);
2648  else
2649  start_time = FFMIN(start_time, start_time1);
2650  end_time1 = av_rescale_q_rnd(st->duration, st->time_base,
2653  if (end_time1 != AV_NOPTS_VALUE && (end_time1 > 0 ? start_time1 <= INT64_MAX - end_time1 : start_time1 >= INT64_MIN - end_time1)) {
2654  end_time1 += start_time1;
2655  if (is_text)
2656  end_time_text = FFMAX(end_time_text, end_time1);
2657  else
2658  end_time = FFMAX(end_time, end_time1);
2659  }
2660  for (p = NULL; (p = av_find_program_from_stream(ic, p, i)); ) {
2661  if (p->start_time == AV_NOPTS_VALUE || p->start_time > start_time1)
2662  p->start_time = start_time1;
2663  if (p->end_time < end_time1)
2664  p->end_time = end_time1;
2665  }
2666  }
2667  if (st->duration != AV_NOPTS_VALUE) {
2668  duration1 = av_rescale_q(st->duration, st->time_base,
2669  AV_TIME_BASE_Q);
2670  if (is_text)
2671  duration_text = FFMAX(duration_text, duration1);
2672  else
2673  duration = FFMAX(duration, duration1);
2674  }
2675  }
2676  if (start_time == INT64_MAX || (start_time > start_time_text && start_time - (uint64_t)start_time_text < AV_TIME_BASE))
2677  start_time = start_time_text;
2678  else if (start_time > start_time_text)
2679  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream starttime %f\n", start_time_text / (float)AV_TIME_BASE);
2680 
2681  if (end_time == INT64_MIN || (end_time < end_time_text && end_time_text - (uint64_t)end_time < AV_TIME_BASE))
2682  end_time = end_time_text;
2683  else if (end_time < end_time_text)
2684  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream endtime %f\n", end_time_text / (float)AV_TIME_BASE);
2685 
2686  if (duration == INT64_MIN || (duration < duration_text && duration_text - duration < AV_TIME_BASE))
2687  duration = duration_text;
2688  else if (duration < duration_text)
2689  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream duration %f\n", duration_text / (float)AV_TIME_BASE);
2690 
2691  if (start_time != INT64_MAX) {
2692  ic->start_time = start_time;
2693  if (end_time != INT64_MIN) {
2694  if (ic->nb_programs > 1) {
2695  for (i = 0; i < ic->nb_programs; i++) {
2696  p = ic->programs[i];
2697  if (p->start_time != AV_NOPTS_VALUE &&
2698  p->end_time > p->start_time &&
2699  p->end_time - (uint64_t)p->start_time <= INT64_MAX)
2700  duration = FFMAX(duration, p->end_time - p->start_time);
2701  }
2702  } else if (end_time >= start_time && end_time - (uint64_t)start_time <= INT64_MAX) {
2703  duration = FFMAX(duration, end_time - start_time);
2704  }
2705  }
2706  }
2707  if (duration != INT64_MIN && duration > 0 && ic->duration == AV_NOPTS_VALUE) {
2708  ic->duration = duration;
2709  }
2710  if (ic->pb && (filesize = avio_size(ic->pb)) > 0 && ic->duration > 0) {
2711  /* compute the bitrate */
2712  double bitrate = (double) filesize * 8.0 * AV_TIME_BASE /
2713  (double) ic->duration;
2714  if (bitrate >= 0 && bitrate <= INT64_MAX)
2715  ic->bit_rate = bitrate;
2716  }
2717 }
2718 
2720 {
2721  int i;
2722  AVStream *st;
2723 
2725  for (i = 0; i < ic->nb_streams; i++) {
2726  st = ic->streams[i];
2727  if (st->start_time == AV_NOPTS_VALUE) {
2728  if (ic->start_time != AV_NOPTS_VALUE)
2730  st->time_base);
2731  if (ic->duration != AV_NOPTS_VALUE)
2733  st->time_base);
2734  }
2735  }
2736 }
2737 
2739 {
2740  int64_t filesize, duration;
2741  int i, show_warning = 0;
2742  AVStream *st;
2743 
2744  /* if bit_rate is already set, we believe it */
2745  if (ic->bit_rate <= 0) {
2746  int64_t bit_rate = 0;
2747  for (i = 0; i < ic->nb_streams; i++) {
2748  st = ic->streams[i];
2749  if (st->codecpar->bit_rate <= 0 && st->internal->avctx->bit_rate > 0)
2750  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
2751  if (st->codecpar->bit_rate > 0) {
2752  if (INT64_MAX - st->codecpar->bit_rate < bit_rate) {
2753  bit_rate = 0;
2754  break;
2755  }
2756  bit_rate += st->codecpar->bit_rate;
2757  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->codec_info_nb_frames > 1) {
2758  // If we have a videostream with packets but without a bitrate
2759  // then consider the sum not known
2760  bit_rate = 0;
2761  break;
2762  }
2763  }
2764  ic->bit_rate = bit_rate;
2765  }
2766 
2767  /* if duration is already set, we believe it */
2768  if (ic->duration == AV_NOPTS_VALUE &&
2769  ic->bit_rate != 0) {
2770  filesize = ic->pb ? avio_size(ic->pb) : 0;
2771  if (filesize > ic->internal->data_offset) {
2772  filesize -= ic->internal->data_offset;
2773  for (i = 0; i < ic->nb_streams; i++) {
2774  st = ic->streams[i];
2775  if ( st->time_base.num <= INT64_MAX / ic->bit_rate
2776  && st->duration == AV_NOPTS_VALUE) {
2777  duration = av_rescale(8 * filesize, st->time_base.den,
2778  ic->bit_rate *
2779  (int64_t) st->time_base.num);
2780  st->duration = duration;
2781  show_warning = 1;
2782  }
2783  }
2784  }
2785  }
2786  if (show_warning)
2787  av_log(ic, AV_LOG_WARNING,
2788  "Estimating duration from bitrate, this may be inaccurate\n");
2789 }
2790 
2791 #define DURATION_MAX_READ_SIZE 250000LL
2792 #define DURATION_MAX_RETRY 6
2793 
2794 /* only usable for MPEG-PS streams */
2795 static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
2796 {
2797  AVPacket pkt1, *pkt = &pkt1;
2798  AVStream *st;
2799  int num, den, read_size, i, ret;
2800  int found_duration = 0;
2801  int is_end;
2802  int64_t filesize, offset, duration;
2803  int retry = 0;
2804 
2805  /* flush packet queue */
2806  flush_packet_queue(ic);
2807 
2808  for (i = 0; i < ic->nb_streams; i++) {
2809  st = ic->streams[i];
2810  if (st->start_time == AV_NOPTS_VALUE &&
2811  st->first_dts == AV_NOPTS_VALUE &&
2813  av_log(ic, AV_LOG_WARNING,
2814  "start time for stream %d is not set in estimate_timings_from_pts\n", i);
2815 
2816  if (st->parser) {
2817  av_parser_close(st->parser);
2818  st->parser = NULL;
2819  }
2820  }
2821 
2823  av_log(ic, AV_LOG_INFO, "Skipping duration calculation in estimate_timings_from_pts\n");
2824  goto skip_duration_calc;
2825  }
2826 
2827  av_opt_set(ic, "skip_changes", "1", AV_OPT_SEARCH_CHILDREN);
2828  /* estimate the end time (duration) */
2829  /* XXX: may need to support wrapping */
2830  filesize = ic->pb ? avio_size(ic->pb) : 0;
2831  do {
2832  is_end = found_duration;
2833  offset = filesize - (DURATION_MAX_READ_SIZE << retry);
2834  if (offset < 0)
2835  offset = 0;
2836 
2837  avio_seek(ic->pb, offset, SEEK_SET);
2838  read_size = 0;
2839  for (;;) {
2840  if (read_size >= DURATION_MAX_READ_SIZE << (FFMAX(retry - 1, 0)))
2841  break;
2842 
2843  do {
2844  ret = ff_read_packet(ic, pkt);
2845  } while (ret == AVERROR(EAGAIN));
2846  if (ret != 0)
2847  break;
2848  read_size += pkt->size;
2849  st = ic->streams[pkt->stream_index];
2850  if (pkt->pts != AV_NOPTS_VALUE &&
2851  (st->start_time != AV_NOPTS_VALUE ||
2852  st->first_dts != AV_NOPTS_VALUE)) {
2853  if (pkt->duration == 0) {
2854  ff_compute_frame_duration(ic, &num, &den, st, st->parser, pkt);
2855  if (den && num) {
2856  pkt->duration = av_rescale_rnd(1,
2857  num * (int64_t) st->time_base.den,
2858  den * (int64_t) st->time_base.num,
2859  AV_ROUND_DOWN);
2860  }
2861  }
2862  duration = pkt->pts + pkt->duration;
2863  found_duration = 1;
2864  if (st->start_time != AV_NOPTS_VALUE)
2865  duration -= st->start_time;
2866  else
2867  duration -= st->first_dts;
2868  if (duration > 0) {
2869  if (st->duration == AV_NOPTS_VALUE || st->info->last_duration<= 0 ||
2870  (st->duration < duration && FFABS(duration - st->info->last_duration) < 60LL*st->time_base.den / st->time_base.num))
2871  st->duration = duration;
2872  st->info->last_duration = duration;
2873  }
2874  }
2875  av_packet_unref(pkt);
2876  }
2877 
2878  /* check if all audio/video streams have valid duration */
2879  if (!is_end) {
2880  is_end = 1;
2881  for (i = 0; i < ic->nb_streams; i++) {
2882  st = ic->streams[i];
2883  switch (st->codecpar->codec_type) {
2884  case AVMEDIA_TYPE_VIDEO:
2885  case AVMEDIA_TYPE_AUDIO:
2886  if (st->duration == AV_NOPTS_VALUE)
2887  is_end = 0;
2888  }
2889  }
2890  }
2891  } while (!is_end &&
2892  offset &&
2893  ++retry <= DURATION_MAX_RETRY);
2894 
2895  av_opt_set(ic, "skip_changes", "0", AV_OPT_SEARCH_CHILDREN);
2896 
2897  /* warn about audio/video streams which duration could not be estimated */
2898  for (i = 0; i < ic->nb_streams; i++) {
2899  st = ic->streams[i];
2900  if (st->duration == AV_NOPTS_VALUE) {
2901  switch (st->codecpar->codec_type) {
2902  case AVMEDIA_TYPE_VIDEO:
2903  case AVMEDIA_TYPE_AUDIO:
2904  if (st->start_time != AV_NOPTS_VALUE || st->first_dts != AV_NOPTS_VALUE) {
2905  av_log(ic, AV_LOG_DEBUG, "stream %d : no PTS found at end of file, duration not set\n", i);
2906  } else
2907  av_log(ic, AV_LOG_DEBUG, "stream %d : no TS found at start of file, duration not set\n", i);
2908  }
2909  }
2910  }
2911 skip_duration_calc:
2913 
2914  avio_seek(ic->pb, old_offset, SEEK_SET);
2915  for (i = 0; i < ic->nb_streams; i++) {
2916  int j;
2917 
2918  st = ic->streams[i];
2919  st->cur_dts = st->first_dts;
2922  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
2923  st->pts_buffer[j] = AV_NOPTS_VALUE;
2924  }
2925 }
2926 
2927 static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
2928 {
2929  int64_t file_size;
2930 
2931  /* get the file size, if possible */
2932  if (ic->iformat->flags & AVFMT_NOFILE) {
2933  file_size = 0;
2934  } else {
2935  file_size = avio_size(ic->pb);
2936  file_size = FFMAX(0, file_size);
2937  }
2938 
2939  if ((!strcmp(ic->iformat->name, "mpeg") ||
2940  !strcmp(ic->iformat->name, "mpegts")) &&
2941  file_size && (ic->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
2942  /* get accurate estimate from the PTSes */
2943  estimate_timings_from_pts(ic, old_offset);
2945  } else if (has_duration(ic)) {
2946  /* at least one component has timings - we use them for all
2947  * the components */
2950  } else {
2951  /* less precise: use bitrate info */
2954  }
2956 
2957  {
2958  int i;
2959  AVStream av_unused *st;
2960  for (i = 0; i < ic->nb_streams; i++) {
2961  st = ic->streams[i];
2962  if (st->time_base.den)
2963  av_log(ic, AV_LOG_TRACE, "stream %d: start_time: %0.3f duration: %0.3f\n", i,
2964  (double) st->start_time * av_q2d(st->time_base),
2965  (double) st->duration * av_q2d(st->time_base));
2966  }
2967  av_log(ic, AV_LOG_TRACE,
2968  "format: start_time: %0.3f duration: %0.3f bitrate=%"PRId64" kb/s\n",
2969  (double) ic->start_time / AV_TIME_BASE,
2970  (double) ic->duration / AV_TIME_BASE,
2971  (int64_t)ic->bit_rate / 1000);
2972  }
2973 }
2974 
2975 static int has_codec_parameters(AVStream *st, const char **errmsg_ptr)
2976 {
2977  AVCodecContext *avctx = st->internal->avctx;
2978 
2979 #define FAIL(errmsg) do { \
2980  if (errmsg_ptr) \
2981  *errmsg_ptr = errmsg; \
2982  return 0; \
2983  } while (0)
2984 
2985  if ( avctx->codec_id == AV_CODEC_ID_NONE
2986  && avctx->codec_type != AVMEDIA_TYPE_DATA)
2987  FAIL("unknown codec");
2988  switch (avctx->codec_type) {
2989  case AVMEDIA_TYPE_AUDIO:
2990  if (!avctx->frame_size && determinable_frame_size(avctx))
2991  FAIL("unspecified frame size");
2992  if (st->info->found_decoder >= 0 &&
2993  avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
2994  FAIL("unspecified sample format");
2995  if (!avctx->sample_rate)
2996  FAIL("unspecified sample rate");
2997  if (!avctx->channels)
2998  FAIL("unspecified number of channels");
2999  if (st->info->found_decoder >= 0 && !st->nb_decoded_frames && avctx->codec_id == AV_CODEC_ID_DTS)
3000  FAIL("no decodable DTS frames");
3001  break;
3002  case AVMEDIA_TYPE_VIDEO:
3003  if (!avctx->width)
3004  FAIL("unspecified size");
3005  if (st->info->found_decoder >= 0 && avctx->pix_fmt == AV_PIX_FMT_NONE)
3006  FAIL("unspecified pixel format");
3009  FAIL("no frame in rv30/40 and no sar");
3010  break;
3011  case AVMEDIA_TYPE_SUBTITLE:
3012  if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
3013  FAIL("unspecified size");
3014  break;
3015  case AVMEDIA_TYPE_DATA:
3016  if (avctx->codec_id == AV_CODEC_ID_NONE) return 1;
3017  }
3018 
3019  return 1;
3020 }
3021 
3022 /* returns 1 or 0 if or if not decoded data was returned, or a negative error */
3025 {
3026  AVCodecContext *avctx = st->internal->avctx;
3027  const AVCodec *codec;
3028  int got_picture = 1, ret = 0;
3030  AVSubtitle subtitle;
3031  AVPacket pkt = *avpkt;
3032  int do_skip_frame = 0;
3033  enum AVDiscard skip_frame;
3034 
3035  if (!frame)
3036  return AVERROR(ENOMEM);
3037 
3038  if (!avcodec_is_open(avctx) &&
3039  st->info->found_decoder <= 0 &&
3040  (st->codecpar->codec_id != -st->info->found_decoder || !st->codecpar->codec_id)) {
3041  AVDictionary *thread_opt = NULL;
3042 
3043  codec = find_probe_decoder(s, st, st->codecpar->codec_id);
3044 
3045  if (!codec) {
3046  st->info->found_decoder = -st->codecpar->codec_id;
3047  ret = -1;
3048  goto fail;
3049  }
3050 
3051  /* Force thread count to 1 since the H.264 decoder will not extract
3052  * SPS and PPS to extradata during multi-threaded decoding. */
3053  av_dict_set(options ? options : &thread_opt, "threads", "1", 0);
3054  if (s->codec_whitelist)
3055  av_dict_set(options ? options : &thread_opt, "codec_whitelist", s->codec_whitelist, 0);
3056  ret = avcodec_open2(avctx, codec, options ? options : &thread_opt);
3057  if (!options)
3058  av_dict_free(&thread_opt);
3059  if (ret < 0) {
3060  st->info->found_decoder = -avctx->codec_id;
3061  goto fail;
3062  }
3063  st->info->found_decoder = 1;
3064  } else if (!st->info->found_decoder)
3065  st->info->found_decoder = 1;
3066 
3067  if (st->info->found_decoder < 0) {
3068  ret = -1;
3069  goto fail;
3070  }
3071 
3073  do_skip_frame = 1;
3074  skip_frame = avctx->skip_frame;
3075  avctx->skip_frame = AVDISCARD_ALL;
3076  }
3077 
3078  while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
3079  ret >= 0 &&
3081  (!st->codec_info_nb_frames &&
3083  got_picture = 0;
3084  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
3085  avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
3086  ret = avcodec_send_packet(avctx, &pkt);
3087  if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3088  break;
3089  if (ret >= 0)
3090  pkt.size = 0;
3091  ret = avcodec_receive_frame(avctx, frame);
3092  if (ret >= 0)
3093  got_picture = 1;
3094  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
3095  ret = 0;
3096  } else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
3097  ret = avcodec_decode_subtitle2(avctx, &subtitle,
3098  &got_picture, &pkt);
3099  if (ret >= 0)
3100  pkt.size = 0;
3101  }
3102  if (ret >= 0) {
3103  if (got_picture)
3104  st->nb_decoded_frames++;
3105  ret = got_picture;
3106  }
3107  }
3108 
3109  if (!pkt.data && !got_picture)
3110  ret = -1;
3111 
3112 fail:
3113  if (do_skip_frame) {
3114  avctx->skip_frame = skip_frame;
3115  }
3116 
3117  av_frame_free(&frame);
3118  return ret;
3119 }
3120 
3121 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
3122 {
3123  while (tags->id != AV_CODEC_ID_NONE) {
3124  if (tags->id == id)
3125  return tags->tag;
3126  tags++;
3127  }
3128  return 0;
3129 }
3130 
3131 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
3132 {
3133  int i;
3134  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3135  if (tag == tags[i].tag)
3136  return tags[i].id;
3137  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3138  if (avpriv_toupper4(tag) == avpriv_toupper4(tags[i].tag))
3139  return tags[i].id;
3140  return AV_CODEC_ID_NONE;
3141 }
3142 
3143 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
3144 {
3145  if (bps <= 0 || bps > 64)
3146  return AV_CODEC_ID_NONE;
3147 
3148  if (flt) {
3149  switch (bps) {
3150  case 32:
3152  case 64:
3154  default:
3155  return AV_CODEC_ID_NONE;
3156  }
3157  } else {
3158  bps += 7;
3159  bps >>= 3;
3160  if (sflags & (1 << (bps - 1))) {
3161  switch (bps) {
3162  case 1:
3163  return AV_CODEC_ID_PCM_S8;
3164  case 2:
3166  case 3:
3168  case 4:
3170  case 8:
3172  default:
3173  return AV_CODEC_ID_NONE;
3174  }
3175  } else {
3176  switch (bps) {
3177  case 1:
3178  return AV_CODEC_ID_PCM_U8;
3179  case 2:
3181  case 3:
3183  case 4:
3185  default:
3186  return AV_CODEC_ID_NONE;
3187  }
3188  }
3189  }
3190 }
3191 
3192 unsigned int av_codec_get_tag(const AVCodecTag *const *tags, enum AVCodecID id)
3193 {
3194  unsigned int tag;
3195  if (!av_codec_get_tag2(tags, id, &tag))
3196  return 0;
3197  return tag;
3198 }
3199 
3200 int av_codec_get_tag2(const AVCodecTag * const *tags, enum AVCodecID id,
3201  unsigned int *tag)
3202 {
3203  int i;
3204  for (i = 0; tags && tags[i]; i++) {
3205  const AVCodecTag *codec_tags = tags[i];
3206  while (codec_tags->id != AV_CODEC_ID_NONE) {
3207  if (codec_tags->id == id) {
3208  *tag = codec_tags->tag;
3209  return 1;
3210  }
3211  codec_tags++;
3212  }
3213  }
3214  return 0;
3215 }
3216 
3217 enum AVCodecID av_codec_get_id(const AVCodecTag *const *tags, unsigned int tag)
3218 {
3219  int i;
3220  for (i = 0; tags && tags[i]; i++) {
3221  enum AVCodecID id = ff_codec_get_id(tags[i], tag);
3222  if (id != AV_CODEC_ID_NONE)
3223  return id;
3224  }
3225  return AV_CODEC_ID_NONE;
3226 }
3227 
3229 {
3230  unsigned int i, j;
3231  int64_t max_time = 0;
3232 
3233  if (s->duration > 0 && s->start_time < INT64_MAX - s->duration)
3234  max_time = s->duration +
3235  ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
3236 
3237  for (i = 0; i < s->nb_chapters; i++)
3238  if (s->chapters[i]->end == AV_NOPTS_VALUE) {
3239  AVChapter *ch = s->chapters[i];
3240  int64_t end = max_time ? av_rescale_q(max_time, AV_TIME_BASE_Q,
3241  ch->time_base)
3242  : INT64_MAX;
3243 
3244  for (j = 0; j < s->nb_chapters; j++) {
3245  AVChapter *ch1 = s->chapters[j];
3246  int64_t next_start = av_rescale_q(ch1->start, ch1->time_base,
3247  ch->time_base);
3248  if (j != i && next_start > ch->start && next_start < end)
3249  end = next_start;
3250  }
3251  ch->end = (end == INT64_MAX || end < ch->start) ? ch->start : end;
3252  }
3253 }
3254 
3255 static int get_std_framerate(int i)
3256 {
3257  if (i < 30*12)
3258  return (i + 1) * 1001;
3259  i -= 30*12;
3260 
3261  if (i < 30)
3262  return (i + 31) * 1001 * 12;
3263  i -= 30;
3264 
3265  if (i < 3)
3266  return ((const int[]) { 80, 120, 240})[i] * 1001 * 12;
3267 
3268  i -= 3;
3269 
3270  return ((const int[]) { 24, 30, 60, 12, 15, 48 })[i] * 1000 * 12;
3271 }
3272 
3273 /* Is the time base unreliable?
3274  * This is a heuristic to balance between quick acceptance of the values in
3275  * the headers vs. some extra checks.
3276  * Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
3277  * MPEG-2 commonly misuses field repeat flags to store different framerates.
3278  * And there are "variable" fps files this needs to detect as well. */
3280 {
3281  if (c->time_base.den >= 101LL * c->time_base.num ||
3282  c->time_base.den < 5LL * c->time_base.num ||
3283  // c->codec_tag == AV_RL32("DIVX") ||
3284  // c->codec_tag == AV_RL32("XVID") ||
3285  c->codec_tag == AV_RL32("mp4v") ||
3287  c->codec_id == AV_CODEC_ID_GIF ||
3288  c->codec_id == AV_CODEC_ID_HEVC ||
3289  c->codec_id == AV_CODEC_ID_H264)
3290  return 1;
3291  return 0;
3292 }
3293 
3295 {
3296  av_freep(&par->extradata);
3297  par->extradata_size = 0;
3298 
3300  return AVERROR(EINVAL);
3301 
3303  if (!par->extradata)
3304  return AVERROR(ENOMEM);
3305 
3306  memset(par->extradata + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3307  par->extradata_size = size;
3308 
3309  return 0;
3310 }
3311 
3313 {
3314  int ret = ff_alloc_extradata(par, size);
3315  if (ret < 0)
3316  return ret;
3317  ret = avio_read(pb, par->extradata, size);
3318  if (ret != size) {
3319  av_freep(&par->extradata);
3320  par->extradata_size = 0;
3321  av_log(s, AV_LOG_ERROR, "Failed to read extradata of size %d\n", size);
3322  return ret < 0 ? ret : AVERROR_INVALIDDATA;
3323  }
3324 
3325  return ret;
3326 }
3327 
3328 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
3329 {
3330  int i, j;
3331  int64_t last = st->info->last_dts;
3332 
3333  if ( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
3334  && ts - (uint64_t)last < INT64_MAX) {
3335  double dts = (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
3336  int64_t duration = ts - last;
3337 
3338  if (!st->info->duration_error)
3339  st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
3340  if (!st->info->duration_error)
3341  return AVERROR(ENOMEM);
3342 
3343 // if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
3344 // av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
3345  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3346  if (st->info->duration_error[0][1][i] < 1e10) {
3347  int framerate = get_std_framerate(i);
3348  double sdts = dts*framerate/(1001*12);
3349  for (j= 0; j<2; j++) {
3350  int64_t ticks = llrint(sdts+j*0.5);
3351  double error= sdts - ticks + j*0.5;
3352  st->info->duration_error[j][0][i] += error;
3353  st->info->duration_error[j][1][i] += error*error;
3354  }
3355  }
3356  }
3357  if (st->info->rfps_duration_sum <= INT64_MAX - duration) {
3358  st->info->duration_count++;
3360  }
3361 
3362  if (st->info->duration_count % 10 == 0) {
3363  int n = st->info->duration_count;
3364  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3365  if (st->info->duration_error[0][1][i] < 1e10) {
3366  double a0 = st->info->duration_error[0][0][i] / n;
3367  double error0 = st->info->duration_error[0][1][i] / n - a0*a0;
3368  double a1 = st->info->duration_error[1][0][i] / n;
3369  double error1 = st->info->duration_error[1][1][i] / n - a1*a1;
3370  if (error0 > 0.04 && error1 > 0.04) {
3371  st->info->duration_error[0][1][i] = 2e10;
3372  st->info->duration_error[1][1][i] = 2e10;
3373  }
3374  }
3375  }
3376  }
3377 
3378  // ignore the first 4 values, they might have some random jitter
3379  if (st->info->duration_count > 3 && is_relative(ts) == is_relative(last))
3380  st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
3381  }
3382  if (ts != AV_NOPTS_VALUE)
3383  st->info->last_dts = ts;
3384 
3385  return 0;
3386 }
3387 
3389 {
3390  int i, j;
3391 
3392  for (i = 0; i < ic->nb_streams; i++) {
3393  AVStream *st = ic->streams[i];
3394 
3396  continue;
3397  // the check for tb_unreliable() is not completely correct, since this is not about handling
3398  // an unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
3399  // ipmovie.c produces.
3400  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)
3401  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);
3402  if (st->info->duration_count>1 && !st->r_frame_rate.num
3403  && tb_unreliable(st->internal->avctx)) {
3404  int num = 0;
3405  double best_error= 0.01;
3406  AVRational ref_rate = st->r_frame_rate.num ? st->r_frame_rate : av_inv_q(st->time_base);
3407 
3408  for (j= 0; j<MAX_STD_TIMEBASES; j++) {
3409  int k;
3410 
3411  if (st->info->codec_info_duration &&
3412  st->info->codec_info_duration*av_q2d(st->time_base) < (1001*11.5)/get_std_framerate(j))
3413  continue;
3414  if (!st->info->codec_info_duration && get_std_framerate(j) < 1001*12)
3415  continue;
3416 
3417  if (av_q2d(st->time_base) * st->info->rfps_duration_sum / st->info->duration_count < (1001*12.0 * 0.8)/get_std_framerate(j))
3418  continue;
3419 
3420  for (k= 0; k<2; k++) {
3421  int n = st->info->duration_count;
3422  double a= st->info->duration_error[k][0][j] / n;
3423  double error= st->info->duration_error[k][1][j]/n - a*a;
3424 
3425  if (error < best_error && best_error> 0.000000001) {
3426  best_error= error;
3427  num = get_std_framerate(j);
3428  }
3429  if (error < 0.02)
3430  av_log(ic, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
3431  }
3432  }
3433  // do not increase frame rate by more than 1 % in order to match a standard rate.
3434  if (num && (!ref_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(ref_rate)))
3435  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
3436  }
3437  if ( !st->avg_frame_rate.num
3438  && st->r_frame_rate.num && st->info->rfps_duration_sum
3439  && st->info->codec_info_duration <= 0
3440  && st->info->duration_count > 2
3441  && 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
3442  ) {
3443  av_log(ic, AV_LOG_DEBUG, "Setting avg frame rate based on r frame rate\n");
3444  st->avg_frame_rate = st->r_frame_rate;
3445  }
3446 
3447  av_freep(&st->info->duration_error);
3448  st->info->last_dts = AV_NOPTS_VALUE;
3449  st->info->duration_count = 0;
3450  st->info->rfps_duration_sum = 0;
3451  }
3452 }
3453 
3455 {
3456  const AVBitStreamFilter *f;
3457 
3458  f = av_bsf_get_by_name("extract_extradata");
3459  if (!f)
3460  return 0;
3461 
3462  if (f->codec_ids) {
3463  const enum AVCodecID *ids;
3464  for (ids = f->codec_ids; *ids != AV_CODEC_ID_NONE; ids++)
3465  if (*ids == st->codecpar->codec_id)
3466  return 1;
3467  }
3468 
3469  return 0;
3470 }
3471 
3473 {
3474  AVStreamInternal *sti = st->internal;
3475  const AVBitStreamFilter *f;
3476  int ret;
3477 
3478  f = av_bsf_get_by_name("extract_extradata");
3479  if (!f)
3480  goto finish;
3481 
3482  /* check that the codec id is supported */
3483  ret = extract_extradata_check(st);
3484  if (!ret)
3485  goto finish;
3486 
3488  if (!sti->extract_extradata.pkt)
3489  return AVERROR(ENOMEM);
3490 
3491  ret = av_bsf_alloc(f, &sti->extract_extradata.bsf);
3492  if (ret < 0)
3493  goto fail;
3494 
3496  st->codecpar);
3497  if (ret < 0)
3498  goto fail;
3499 
3501 
3502  ret = av_bsf_init(sti->extract_extradata.bsf);
3503  if (ret < 0)
3504  goto fail;
3505 
3506 finish:
3507  sti->extract_extradata.inited = 1;
3508 
3509  return 0;
3510 fail:
3513  return ret;
3514 }
3515 
3517 {
3518  AVStreamInternal *sti = st->internal;
3519  AVPacket *pkt_ref;
3520  int ret;
3521 
3522  if (!sti->extract_extradata.inited) {
3523  ret = extract_extradata_init(st);
3524  if (ret < 0)
3525  return ret;
3526  }
3527 
3528  if (sti->extract_extradata.inited && !sti->extract_extradata.bsf)
3529  return 0;
3530 
3531  pkt_ref = sti->extract_extradata.pkt;
3532  ret = av_packet_ref(pkt_ref, pkt);
3533  if (ret < 0)
3534  return ret;
3535 
3536  ret = av_bsf_send_packet(sti->extract_extradata.bsf, pkt_ref);
3537  if (ret < 0) {
3538  av_packet_unref(pkt_ref);
3539  return ret;
3540  }
3541 
3542  while (ret >= 0 && !sti->avctx->extradata) {
3543  int extradata_size;
3544  uint8_t *extradata;
3545 
3546  ret = av_bsf_receive_packet(sti->extract_extradata.bsf, pkt_ref);
3547  if (ret < 0) {
3548  if (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3549  return ret;
3550  continue;
3551  }
3552 
3554  &extradata_size);
3555 
3556  if (extradata) {
3557  av_assert0(!sti->avctx->extradata);
3558  if ((unsigned)extradata_size < FF_MAX_EXTRADATA_SIZE)
3559  sti->avctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
3560  if (!sti->avctx->extradata) {
3561  av_packet_unref(pkt_ref);
3562  return AVERROR(ENOMEM);
3563  }
3564  memcpy(sti->avctx->extradata, extradata, extradata_size);
3565  sti->avctx->extradata_size = extradata_size;
3566  }
3567  av_packet_unref(pkt_ref);
3568  }
3569 
3570  return 0;
3571 }
3572 
3574 {
3575  int i, count = 0, ret = 0, j;
3576  int64_t read_size;
3577  AVStream *st;
3578  AVCodecContext *avctx;
3579  AVPacket pkt1, *pkt;
3580  int64_t old_offset = avio_tell(ic->pb);
3581  // new streams might appear, no options for those
3582  int orig_nb_streams = ic->nb_streams;
3583  int flush_codecs;
3584  int64_t max_analyze_duration = ic->max_analyze_duration;
3585  int64_t max_stream_analyze_duration;
3586  int64_t max_subtitle_analyze_duration;
3587  int64_t probesize = ic->probesize;
3588  int eof_reached = 0;
3589  int *missing_streams = av_opt_ptr(ic->iformat->priv_class, ic->priv_data, "missing_streams");
3590 
3591  flush_codecs = probesize > 0;
3592 
3593  av_opt_set(ic, "skip_clear", "1", AV_OPT_SEARCH_CHILDREN);
3594 
3595  max_stream_analyze_duration = max_analyze_duration;
3596  max_subtitle_analyze_duration = max_analyze_duration;
3597  if (!max_analyze_duration) {
3598  max_stream_analyze_duration =
3599  max_analyze_duration = 5*AV_TIME_BASE;
3600  max_subtitle_analyze_duration = 30*AV_TIME_BASE;
3601  if (!strcmp(ic->iformat->name, "flv"))
3602  max_stream_analyze_duration = 90*AV_TIME_BASE;
3603  if (!strcmp(ic->iformat->name, "mpeg") || !strcmp(ic->iformat->name, "mpegts"))
3604  max_stream_analyze_duration = 7*AV_TIME_BASE;
3605  }
3606 
3607  if (ic->pb)
3608  av_log(ic, AV_LOG_DEBUG, "Before avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d nb_streams:%d\n",
3609  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, ic->nb_streams);
3610 
3611  for (i = 0; i < ic->nb_streams; i++) {
3612  const AVCodec *codec;
3613  AVDictionary *thread_opt = NULL;
3614  st = ic->streams[i];
3615  avctx = st->internal->avctx;
3616 
3617  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
3619 /* if (!st->time_base.num)
3620  st->time_base = */
3621  if (!avctx->time_base.num)
3622  avctx->time_base = st->time_base;
3623  }
3624 
3625  /* check if the caller has overridden the codec id */
3626 #if FF_API_LAVF_AVCTX
3628  if (st->codec->codec_id != st->internal->orig_codec_id) {
3629  st->codecpar->codec_id = st->codec->codec_id;
3630  st->codecpar->codec_type = st->codec->codec_type;
3631  st->internal->orig_codec_id = st->codec->codec_id;
3632  }
3634 #endif
3635  // only for the split stuff
3636  if (!st->parser && !(ic->flags & AVFMT_FLAG_NOPARSE) && st->request_probe <= 0) {
3637  st->parser = av_parser_init(st->codecpar->codec_id);
3638  if (st->parser) {
3639  if (st->need_parsing == AVSTREAM_PARSE_HEADERS) {
3641  } else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW) {
3643  }
3644  } else if (st->need_parsing) {
3645  av_log(ic, AV_LOG_VERBOSE, "parser not found for codec "
3646  "%s, packets or times may be invalid.\n",
3648  }
3649  }
3650 
3651  if (st->codecpar->codec_id != st->internal->orig_codec_id)
3653 
3655  if (ret < 0)
3656  goto find_stream_info_err;
3657  if (st->request_probe <= 0)
3658  st->internal->avctx_inited = 1;
3659 
3660  codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3661 
3662  /* Force thread count to 1 since the H.264 decoder will not extract
3663  * SPS and PPS to extradata during multi-threaded decoding. */
3664  av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
3665 
3666  if (ic->codec_whitelist)
3667  av_dict_set(options ? &options[i] : &thread_opt, "codec_whitelist", ic->codec_whitelist, 0);
3668 
3669  /* Ensure that subtitle_header is properly set. */
3671  && codec && !avctx->codec) {
3672  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3673  av_log(ic, AV_LOG_WARNING,
3674  "Failed to open codec in %s\n",__FUNCTION__);
3675  }
3676 
3677  // Try to just open decoders, in case this is enough to get parameters.
3678  if (!has_codec_parameters(st, NULL) && st->request_probe <= 0) {
3679  if (codec && !avctx->codec)
3680  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3681  av_log(ic, AV_LOG_WARNING,
3682  "Failed to open codec in %s\n",__FUNCTION__);
3683  }
3684  if (!options)
3685  av_dict_free(&thread_opt);
3686  }
3687 
3688  for (i = 0; i < ic->nb_streams; i++) {
3689 #if FF_API_R_FRAME_RATE
3691 #endif
3694  }
3695 
3696  read_size = 0;
3697  for (;;) {
3698  int analyzed_all_streams;
3700  ret = AVERROR_EXIT;
3701  av_log(ic, AV_LOG_DEBUG, "interrupted\n");
3702  break;
3703  }
3704 
3705  /* check if one codec still needs to be handled */
3706  for (i = 0; i < ic->nb_streams; i++) {
3707  int fps_analyze_framecount = 20;
3708  int count;
3709 
3710  st = ic->streams[i];
3711  if (!has_codec_parameters(st, NULL))
3712  break;
3713  /* If the timebase is coarse (like the usual millisecond precision
3714  * of mkv), we need to analyze more frames to reliably arrive at
3715  * the correct fps. */
3716  if (av_q2d(st->time_base) > 0.0005)
3717  fps_analyze_framecount *= 2;
3718  if (!tb_unreliable(st->internal->avctx))
3719  fps_analyze_framecount = 0;
3720  if (ic->fps_probe_size >= 0)
3721  fps_analyze_framecount = ic->fps_probe_size;
3723  fps_analyze_framecount = 0;
3724  /* variable fps and no guess at the real fps */
3725  count = (ic->iformat->flags & AVFMT_NOTIMESTAMPS) ?
3727  st->info->duration_count;
3728  if (!(st->r_frame_rate.num && st->avg_frame_rate.num) &&
3730  if (count < fps_analyze_framecount)
3731  break;
3732  }
3733  // Look at the first 3 frames if there is evidence of frame delay
3734  // but the decoder delay is not set.
3735  if (st->info->frame_delay_evidence && count < 2 && st->internal->avctx->has_b_frames == 0)
3736  break;
3737  if (!st->internal->avctx->extradata &&
3739  st->internal->extract_extradata.bsf) &&
3741  break;
3742  if (st->first_dts == AV_NOPTS_VALUE &&
3743  !(ic->iformat->flags & AVFMT_NOTIMESTAMPS) &&
3747  break;
3748  }
3749  analyzed_all_streams = 0;
3750  if (!missing_streams || !*missing_streams)
3751  if (i == ic->nb_streams) {
3752  analyzed_all_streams = 1;
3753  /* NOTE: If the format has no header, then we need to read some
3754  * packets to get most of the streams, so we cannot stop here. */
3755  if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
3756  /* If we found the info for all the codecs, we can stop. */
3757  ret = count;
3758  av_log(ic, AV_LOG_DEBUG, "All info found\n");
3759  flush_codecs = 0;
3760  break;
3761  }
3762  }
3763  /* We did not get all the codec info, but we read too much data. */
3764  if (read_size >= probesize) {
3765  ret = count;
3766  av_log(ic, AV_LOG_DEBUG,
3767  "Probe buffer size limit of %"PRId64" bytes reached\n", probesize);
3768  for (i = 0; i < ic->nb_streams; i++)
3769  if (!ic->streams[i]->r_frame_rate.num &&
3770  ic->streams[i]->info->duration_count <= 1 &&
3772  strcmp(ic->iformat->name, "image2"))
3773  av_log(ic, AV_LOG_WARNING,
3774  "Stream #%d: not enough frames to estimate rate; "
3775  "consider increasing probesize\n", i);
3776  break;
3777  }
3778 
3779  /* NOTE: A new stream can be added there if no header in file
3780  * (AVFMTCTX_NOHEADER). */
3781  ret = read_frame_internal(ic, &pkt1);
3782  if (ret == AVERROR(EAGAIN))
3783  continue;
3784 
3785  if (ret < 0) {
3786  /* EOF or error*/
3787  eof_reached = 1;
3788  break;
3789  }
3790 
3791  pkt = &pkt1;
3792 
3793  if (!(ic->flags & AVFMT_FLAG_NOBUFFER)) {
3796  pkt, 0);
3797  if (ret < 0)
3798  goto find_stream_info_err;
3799  }
3800 
3801  st = ic->streams[pkt->stream_index];
3803  read_size += pkt->size;
3804 
3805  avctx = st->internal->avctx;
3806  if (!st->internal->avctx_inited) {
3808  if (ret < 0)
3809  goto find_stream_info_err;
3810  st->internal->avctx_inited = 1;
3811  }
3812 
3813  if (pkt->dts != AV_NOPTS_VALUE && st->codec_info_nb_frames > 1) {
3814  /* check for non-increasing dts */
3815  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3816  st->info->fps_last_dts >= pkt->dts) {
3817  av_log(ic, AV_LOG_DEBUG,
3818  "Non-increasing DTS in stream %d: packet %d with DTS "
3819  "%"PRId64", packet %d with DTS %"PRId64"\n",
3820  st->index, st->info->fps_last_dts_idx,
3822  pkt->dts);
3823  st->info->fps_first_dts =
3825  }
3826  /* Check for a discontinuity in dts. If the difference in dts
3827  * is more than 1000 times the average packet duration in the
3828  * sequence, we treat it as a discontinuity. */
3829  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3831  (pkt->dts - (uint64_t)st->info->fps_last_dts) / 1000 >
3832  (st->info->fps_last_dts - (uint64_t)st->info->fps_first_dts) /
3833  (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
3834  av_log(ic, AV_LOG_WARNING,
3835  "DTS discontinuity in stream %d: packet %d with DTS "
3836  "%"PRId64", packet %d with DTS %"PRId64"\n",
3837  st->index, st->info->fps_last_dts_idx,
3839  pkt->dts);
3840  st->info->fps_first_dts =
3842  }
3843 
3844  /* update stored dts values */
3845  if (st->info->fps_first_dts == AV_NOPTS_VALUE) {
3846  st->info->fps_first_dts = pkt->dts;
3848  }
3849  st->info->fps_last_dts = pkt->dts;
3851  }
3852  if (st->codec_info_nb_frames>1) {
3853  int64_t t = 0;
3854  int64_t limit;
3855 
3856  if (st->time_base.den > 0)
3858  if (st->avg_frame_rate.num > 0)
3860 
3861  if ( t == 0
3862  && st->codec_info_nb_frames>30
3863  && st->info->fps_first_dts != AV_NOPTS_VALUE
3864  && st->info->fps_last_dts != AV_NOPTS_VALUE)
3866 
3867  if (analyzed_all_streams) limit = max_analyze_duration;
3868  else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) limit = max_subtitle_analyze_duration;
3869  else limit = max_stream_analyze_duration;
3870 
3871  if (t >= limit) {
3872  av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds st:%d\n",
3873  limit,
3874  t, pkt->stream_index);
3875  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3876  av_packet_unref(pkt);
3877  break;
3878  }
3879  if (pkt->duration) {
3880  if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE && pkt->pts != AV_NOPTS_VALUE && st->start_time != AV_NOPTS_VALUE && pkt->pts >= st->start_time) {
3881  st->info->codec_info_duration = FFMIN(pkt->pts - st->start_time, st->info->codec_info_duration + pkt->duration);
3882  } else
3883  st->info->codec_info_duration += pkt->duration;
3884  st->info->codec_info_duration_fields += st->parser && st->need_parsing && avctx->ticks_per_frame ==2 ? st->parser->repeat_pict + 1 : 2;
3885  }
3886  }
3887  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
3888 #if FF_API_R_FRAME_RATE
3889  ff_rfps_add_frame(ic, st, pkt->dts);
3890 #endif
3891  if (pkt->dts != pkt->pts && pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE)
3892  st->info->frame_delay_evidence = 1;
3893  }
3894  if (!st->internal->avctx->extradata) {
3895  ret = extract_extradata(st, pkt);
3896  if (ret < 0)
3897  goto find_stream_info_err;
3898  }
3899 
3900  /* If still no information, we try to open the codec and to
3901  * decompress the frame. We try to avoid that in most cases as
3902  * it takes longer and uses more memory. For MPEG-4, we need to
3903  * decompress for QuickTime.
3904  *
3905  * If AV_CODEC_CAP_CHANNEL_CONF is set this will force decoding of at
3906  * least one frame of codec data, this makes sure the codec initializes
3907  * the channel configuration and does not only trust the values from
3908  * the container. */
3909  try_decode_frame(ic, st, pkt,
3910  (options && i < orig_nb_streams) ? &options[i] : NULL);
3911 
3912  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3913  av_packet_unref(pkt);
3914 
3915  st->codec_info_nb_frames++;
3916  count++;
3917  }
3918 
3919  if (eof_reached) {
3920  int stream_index;
3921  for (stream_index = 0; stream_index < ic->nb_streams; stream_index++) {
3922  st = ic->streams[stream_index];
3923  avctx = st->internal->avctx;
3924  if (!has_codec_parameters(st, NULL)) {
3925  const AVCodec *codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3926  if (codec && !avctx->codec) {
3927  AVDictionary *opts = NULL;
3928  if (ic->codec_whitelist)
3929  av_dict_set(&opts, "codec_whitelist", ic->codec_whitelist, 0);
3930  if (avcodec_open2(avctx, codec, (options && stream_index < orig_nb_streams) ? &options[stream_index] : &opts) < 0)
3931  av_log(ic, AV_LOG_WARNING,
3932  "Failed to open codec in %s\n",__FUNCTION__);
3933  av_dict_free(&opts);
3934  }
3935  }
3936 
3937  // EOF already reached while reading the stream above.
3938  // So continue with reoordering DTS with whatever delay we have.
3940  update_dts_from_pts(ic, stream_index, ic->internal->packet_buffer);
3941  }
3942  }
3943  }
3944 
3945  if (flush_codecs) {
3946  AVPacket empty_pkt = { 0 };
3947  int err = 0;
3948  av_init_packet(&empty_pkt);
3949 
3950  for (i = 0; i < ic->nb_streams; i++) {
3951 
3952  st = ic->streams[i];
3953 
3954  /* flush the decoders */
3955  if (st->info->found_decoder == 1) {
3956  do {
3957  err = try_decode_frame(ic, st, &empty_pkt,
3958  (options && i < orig_nb_streams)
3959  ? &options[i] : NULL);
3960  } while (err > 0 && !has_codec_parameters(st, NULL));
3961 
3962  if (err < 0) {
3963  av_log(ic, AV_LOG_INFO,
3964  "decoding for stream %d failed\n", st->index);
3965  }
3966  }
3967  }
3968  }
3969 
3970  ff_rfps_calculate(ic);
3971 
3972  for (i = 0; i < ic->nb_streams; i++) {
3973  st = ic->streams[i];
3974  avctx = st->internal->avctx;
3975  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
3976  if (avctx->codec_id == AV_CODEC_ID_RAWVIDEO && !avctx->codec_tag && !avctx->bits_per_coded_sample) {
3977  uint32_t tag= avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
3979  avctx->codec_tag= tag;
3980  }
3981 
3982  /* estimate average framerate if not set by demuxer */
3983  if (st->info->codec_info_duration_fields &&
3984  !st->avg_frame_rate.num &&
3985  st->info->codec_info_duration) {
3986  int best_fps = 0;
3987  double best_error = 0.01;
3988  AVRational codec_frame_rate = avctx->framerate;
3989 
3990  if (st->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
3991  st->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
3992  st->info->codec_info_duration < 0)
3993  continue;
3995  st->info->codec_info_duration_fields * (int64_t) st->time_base.den,
3996  st->info->codec_info_duration * 2 * (int64_t) st->time_base.num, 60000);
3997 
3998  /* Round guessed framerate to a "standard" framerate if it's
3999  * within 1% of the original estimate. */
4000  for (j = 0; j < MAX_STD_TIMEBASES; j++) {
4001  AVRational std_fps = { get_std_framerate(j), 12 * 1001 };
4002  double error = fabs(av_q2d(st->avg_frame_rate) /
4003  av_q2d(std_fps) - 1);
4004 
4005  if (error < best_error) {
4006  best_error = error;
4007  best_fps = std_fps.num;
4008  }
4009 
4010  if (ic->internal->prefer_codec_framerate && codec_frame_rate.num > 0 && codec_frame_rate.den > 0) {
4011  error = fabs(av_q2d(codec_frame_rate) /
4012  av_q2d(std_fps) - 1);
4013  if (error < best_error) {
4014  best_error = error;
4015  best_fps = std_fps.num;
4016  }
4017  }
4018  }
4019  if (best_fps)
4021  best_fps, 12 * 1001, INT_MAX);
4022  }
4023 
4024  if (!st->r_frame_rate.num) {
4025  if ( avctx->time_base.den * (int64_t) st->time_base.num
4026  <= avctx->time_base.num * avctx->ticks_per_frame * (int64_t) st->time_base.den) {
4028  avctx->time_base.den, (int64_t)avctx->time_base.num * avctx->ticks_per_frame, INT_MAX);
4029  } else {
4030  st->r_frame_rate.num = st->time_base.den;
4031  st->r_frame_rate.den = st->time_base.num;
4032  }
4033  }
4035  AVRational hw_ratio = { avctx->height, avctx->width };
4037  hw_ratio);
4038  }
4039  } else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
4040  if (!avctx->bits_per_coded_sample)
4041  avctx->bits_per_coded_sample =
4043  // set stream disposition based on audio service type
4044  switch (avctx->audio_service_type) {
4047  break;
4050  break;
4053  break;
4056  break;
4059  break;
4060  }
4061  }
4062  }
4063 
4064  if (probesize)
4065  estimate_timings(ic, old_offset);
4066 
4067  av_opt_set(ic, "skip_clear", "0", AV_OPT_SEARCH_CHILDREN);
4068 
4069  if (ret >= 0 && ic->nb_streams)
4070  /* We could not have all the codec parameters before EOF. */
4071  ret = -1;
4072  for (i = 0; i < ic->nb_streams; i++) {
4073  const char *errmsg;
4074  st = ic->streams[i];
4075 
4076  /* if no packet was ever seen, update context now for has_codec_parameters */
4077  if (!st->internal->avctx_inited) {
4078  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
4080  st->codecpar->format = st->internal->avctx->sample_fmt;
4082  if (ret < 0)
4083  goto find_stream_info_err;
4084  }
4085  if (!has_codec_parameters(st, &errmsg)) {
4086  char buf[256];
4087  avcodec_string(buf, sizeof(buf), st->internal->avctx, 0);
4088  av_log(ic, AV_LOG_WARNING,
4089  "Could not find codec parameters for stream %d (%s): %s\n"
4090  "Consider increasing the value for the 'analyzeduration' and 'probesize' options\n",
4091  i, buf, errmsg);
4092  } else {
4093  ret = 0;
4094  }
4095  }
4096 
4098 
4099  /* update the stream parameters from the internal codec contexts */
4100  for (i = 0; i < ic->nb_streams; i++) {
4101  st = ic->streams[i];
4102 
4103  if (st->internal->avctx_inited) {
4104  int orig_w = st->codecpar->width;
4105  int orig_h = st->codecpar->height;
4107  if (ret < 0)
4108  goto find_stream_info_err;
4109 #if FF_API_LOWRES
4110  // The decoder might reduce the video size by the lowres factor.
4111  if (st->internal->avctx->lowres && orig_w) {
4112  st->codecpar->width = orig_w;
4113  st->codecpar->height = orig_h;
4114  }
4115 #endif
4116  }
4117 
4118 #if FF_API_LAVF_AVCTX
4120  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
4121  if (ret < 0)
4122  goto find_stream_info_err;
4123 
4124 #if FF_API_LOWRES
4125  // The old API (AVStream.codec) "requires" the resolution to be adjusted
4126  // by the lowres factor.
4127  if (st->internal->avctx->lowres && st->internal->avctx->width) {
4128  st->codec->lowres = st->internal->avctx->lowres;
4129  st->codec->width = st->internal->avctx->width;
4130  st->codec->height = st->internal->avctx->height;
4131  }
4132 #endif
4133 
4134  if (st->codec->codec_tag != MKTAG('t','m','c','d')) {
4135  st->codec->time_base = st->internal->avctx->time_base;
4136  st->codec->ticks_per_frame = st->internal->avctx->ticks_per_frame;
4137  }
4138  st->codec->framerate = st->avg_frame_rate;
4139 
4140  if (st->internal->avctx->subtitle_header) {
4141  st->codec->subtitle_header = av_malloc(st->internal->avctx->subtitle_header_size);
4142  if (!st->codec->subtitle_header)
4143  goto find_stream_info_err;
4144  st->codec->subtitle_header_size = st->internal->avctx->subtitle_header_size;
4145  memcpy(st->codec->subtitle_header, st->internal->avctx->subtitle_header,
4146  st->codec->subtitle_header_size);
4147  }
4148 
4149  // Fields unavailable in AVCodecParameters
4150  st->codec->coded_width = st->internal->avctx->coded_width;
4151  st->codec->coded_height = st->internal->avctx->coded_height;
4152  st->codec->properties = st->internal->avctx->properties;
4154 #endif
4155 
4156  st->internal->avctx_inited = 0;
4157  }
4158 
4159 find_stream_info_err:
4160  for (i = 0; i < ic->nb_streams; i++) {
4161  st = ic->streams[i];
4162  if (st->info)
4163  av_freep(&st->info->duration_error);
4164  avcodec_close(ic->streams[i]->internal->avctx);
4165  av_freep(&ic->streams[i]->info);
4168  }
4169  if (ic->pb)
4170  av_log(ic, AV_LOG_DEBUG, "After avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d frames:%d\n",
4171  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, count);
4172  return ret;
4173 }
4174 
4176 {
4177  int i, j;
4178 
4179  for (i = 0; i < ic->nb_programs; i++) {
4180  if (ic->programs[i] == last) {
4181  last = NULL;
4182  } else {
4183  if (!last)
4184  for (j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
4185  if (ic->programs[i]->stream_index[j] == s)
4186  return ic->programs[i];
4187  }
4188  }
4189  return NULL;
4190 }
4191 
4193  int wanted_stream_nb, int related_stream,
4194  AVCodec **decoder_ret, int flags)
4195 {
4196  int i, nb_streams = ic->nb_streams;
4198  int best_count = -1, best_multiframe = -1, best_disposition = -1;
4199  int count, multiframe, disposition;
4200  int64_t best_bitrate = -1;
4201  int64_t bitrate;
4202  unsigned *program = NULL;
4203  const AVCodec *decoder = NULL, *best_decoder = NULL;
4204 
4205  if (related_stream >= 0 && wanted_stream_nb < 0) {
4206  AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
4207  if (p) {
4208  program = p->stream_index;
4209  nb_streams = p->nb_stream_indexes;
4210  }
4211  }
4212  for (i = 0; i < nb_streams; i++) {
4213  int real_stream_index = program ? program[i] : i;
4214  AVStream *st = ic->streams[real_stream_index];
4215  AVCodecParameters *par = st->codecpar;
4216  if (par->codec_type != type)
4217  continue;
4218  if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
4219  continue;
4220  if (type == AVMEDIA_TYPE_AUDIO && !(par->channels && par->sample_rate))
4221  continue;
4222  if (decoder_ret) {
4223  decoder = find_decoder(ic, st, par->codec_id);
4224  if (!decoder) {
4225  if (ret < 0)
4227  continue;
4228  }
4229  }
4231  + !! (st->disposition & AV_DISPOSITION_DEFAULT);
4232  count = st->codec_info_nb_frames;
4233  bitrate = par->bit_rate;
4234  multiframe = FFMIN(5, count);
4235  if ((best_disposition > disposition) ||
4236  (best_disposition == disposition && best_multiframe > multiframe) ||
4237  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate > bitrate) ||
4238  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
4239  continue;
4240  best_disposition = disposition;
4241  best_count = count;
4242  best_bitrate = bitrate;
4243  best_multiframe = multiframe;
4244  ret = real_stream_index;
4245  best_decoder = decoder;
4246  if (program && i == nb_streams - 1 && ret < 0) {
4247  program = NULL;
4248  nb_streams = ic->nb_streams;
4249  /* no related stream found, try again with everything */
4250  i = 0;
4251  }
4252  }
4253  if (decoder_ret)
4254  *decoder_ret = (AVCodec*)best_decoder;
4255  return ret;
4256 }
4257 
4258 /*******************************************************/
4259 
4261 {
4262  if (s->iformat->read_play)
4263  return s->iformat->read_play(s);
4264  if (s->pb)
4265  return avio_pause(s->pb, 0);
4266  return AVERROR(ENOSYS);
4267 }
4268 
4270 {
4271  if (s->iformat->read_pause)
4272  return s->iformat->read_pause(s);
4273  if (s->pb)
4274  return avio_pause(s->pb, 1);
4275  return AVERROR(ENOSYS);
4276 }
4277 
4279 {
4280  int ret, i;
4281 
4282  dst->id = src->id;
4283  dst->time_base = src->time_base;
4284  dst->nb_frames = src->nb_frames;
4285  dst->disposition = src->disposition;
4287  dst->avg_frame_rate = src->avg_frame_rate;
4288  dst->r_frame_rate = src->r_frame_rate;
4289 
4290  av_dict_free(&dst->metadata);
4291  ret = av_dict_copy(&dst->metadata, src->metadata, 0);
4292  if (ret < 0)
4293  return ret;
4294 
4295  ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
4296  if (ret < 0)
4297  return ret;
4298 
4299  /* Free existing side data*/
4300  for (i = 0; i < dst->nb_side_data; i++)
4301  av_free(dst->side_data[i].data);
4302  av_freep(&dst->side_data);
4303  dst->nb_side_data = 0;
4304 
4305  /* Copy side data if present */
4306  if (src->nb_side_data) {
4308  sizeof(AVPacketSideData));
4309  if (!dst->side_data)
4310  return AVERROR(ENOMEM);
4311  dst->nb_side_data = src->nb_side_data;
4312 
4313  for (i = 0; i < src->nb_side_data; i++) {
4314  uint8_t *data = av_memdup(src->side_data[i].data,
4315  src->side_data[i].size);
4316  if (!data)
4317  return AVERROR(ENOMEM);
4318  dst->side_data[i].type = src->side_data[i].type;
4319  dst->side_data[i].size = src->side_data[i].size;
4320  dst->side_data[i].data = data;
4321  }
4322  }
4323 
4324 #if FF_API_LAVF_FFSERVER
4326  av_freep(&dst->recommended_encoder_configuration);
4327  if (src->recommended_encoder_configuration) {
4328  const char *conf_str = src->recommended_encoder_configuration;
4329  dst->recommended_encoder_configuration = av_strdup(conf_str);
4330  if (!dst->recommended_encoder_configuration)
4331  return AVERROR(ENOMEM);
4332  }
4334 #endif
4335 
4336  return 0;
4337 }
4338 
4339 static void free_stream(AVStream **pst)
4340 {
4341  AVStream *st = *pst;
4342  int i;
4343 
4344  if (!st)
4345  return;
4346 
4347  for (i = 0; i < st->nb_side_data; i++)
4348  av_freep(&st->side_data[i].data);
4349  av_freep(&st->side_data);
4350 
4351  if (st->parser)
4352  av_parser_close(st->parser);
4353 
4354  if (st->attached_pic.data)
4356 
4357  if (st->internal) {
4359  for (i = 0; i < st->internal->nb_bsfcs; i++) {
4360  av_bsf_free(&st->internal->bsfcs[i]);
4361  av_freep(&st->internal->bsfcs);
4362  }
4363  av_freep(&st->internal->priv_pts);
4366  }
4367  av_freep(&st->internal);
4368 
4369  av_dict_free(&st->metadata);
4371  av_freep(&st->probe_data.buf);
4372  av_freep(&st->index_entries);
4373 #if FF_API_LAVF_AVCTX
4375  avcodec_free_context(&st->codec);
4377 #endif
4378  av_freep(&st->priv_data);
4379  if (st->info)
4380  av_freep(&st->info->duration_error);
4381  av_freep(&st->info);
4382 #if FF_API_LAVF_FFSERVER
4384  av_freep(&st->recommended_encoder_configuration);
4386 #endif
4387 
4388  av_freep(pst);
4389 }
4390 
4392 {
4393  av_assert0(s->nb_streams>0);
4394  av_assert0(s->streams[ s->nb_streams - 1 ] == st);
4395 
4396  free_stream(&s->streams[ --s->nb_streams ]);
4397 }
4398 
4400 {
4401  int i;
4402 
4403  if (!s)
4404  return;
4405 
4406  av_opt_free(s);
4407  if (s->iformat && s->iformat->priv_class && s->priv_data)
4408  av_opt_free(s->priv_data);
4409  if (s->oformat && s->oformat->priv_class && s->priv_data)
4410  av_opt_free(s->priv_data);
4411 
4412  for (i = s->nb_streams - 1; i >= 0; i--)
4413  ff_free_stream(s, s->streams[i]);
4414 
4415 
4416  for (i = s->nb_programs - 1; i >= 0; i--) {
4417  av_dict_free(&s->programs[i]->metadata);
4418  av_freep(&s->programs[i]->stream_index);
4419  av_freep(&s->programs[i]);
4420  }
4421  av_freep(&s->programs);
4422  av_freep(&s->priv_data);
4423  while (s->nb_chapters--) {
4425  av_freep(&s->chapters[s->nb_chapters]);
4426  }
4427  av_freep(&s->chapters);
4428  av_dict_free(&s->metadata);
4430  av_freep(&s->streams);
4431  flush_packet_queue(s);
4432  av_freep(&s->internal);
4433  av_freep(&s->url);
4434  av_free(s);
4435 }
4436 
4438 {
4439  AVFormatContext *s;
4440  AVIOContext *pb;
4441 
4442  if (!ps || !*ps)
4443  return;
4444 
4445  s = *ps;
4446  pb = s->pb;
4447 
4448  if ((s->iformat && strcmp(s->iformat->name, "image2") && s->iformat->flags & AVFMT_NOFILE) ||
4449  (s->flags & AVFMT_FLAG_CUSTOM_IO))
4450  pb = NULL;
4451 
4452  flush_packet_queue(s);
4453 
4454  if (s->iformat)
4455  if (s->iformat->read_close)
4456  s->iformat->read_close(s);
4457 
4459 
4460  *ps = NULL;
4461 
4462  avio_close(pb);
4463 }
4464 
4466 {
4467  AVStream *st;
4468  int i;
4469  AVStream **streams;
4470 
4471  if (s->nb_streams >= FFMIN(s->max_streams, INT_MAX/sizeof(*streams))) {
4472  if (s->max_streams < INT_MAX/sizeof(*streams))
4473  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);
4474  return NULL;
4475  }
4476  streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
4477  if (!streams)
4478  return NULL;
4479  s->streams = streams;
4480 
4481  st = av_mallocz(sizeof(AVStream));
4482  if (!st)
4483  return NULL;
4484  if (!(st->info = av_mallocz(sizeof(*st->info)))) {
4485  av_free(st);
4486  return NULL;
4487  }
4488  st->info->last_dts = AV_NOPTS_VALUE;
4489 
4490 #if FF_API_LAVF_AVCTX
4492  st->codec = avcodec_alloc_context3(c);
4493  if (!st->codec) {
4494  av_free(st->info);
4495  av_free(st);
4496  return NULL;
4497  }
4499 #endif
4500 
4501  st->internal = av_mallocz(sizeof(*st->internal));
4502  if (!st->internal)
4503  goto fail;
4504 
4506  if (!st->codecpar)
4507  goto fail;
4508 
4510  if (!st->internal->avctx)
4511  goto fail;
4512 
4513  if (s->iformat) {
4514 #if FF_API_LAVF_AVCTX
4516  /* no default bitrate if decoding */
4517  st->codec->bit_rate = 0;
4519 #endif
4520 
4521  /* default pts setting is MPEG-like */
4522  avpriv_set_pts_info(st, 33, 1, 90000);
4523  /* we set the current DTS to 0 so that formats without any timestamps
4524  * but durations get some timestamps, formats with some unknown
4525  * timestamps have their first few packets buffered and the
4526  * timestamps corrected before they are returned to the user */
4527  st->cur_dts = RELATIVE_TS_BASE;
4528  } else {
4529  st->cur_dts = AV_NOPTS_VALUE;
4530  }
4531 
4532  st->index = s->nb_streams;
4533  st->start_time = AV_NOPTS_VALUE;
4534  st->duration = AV_NOPTS_VALUE;
4535  st->first_dts = AV_NOPTS_VALUE;
4539 
4542  for (i = 0; i < MAX_REORDER_DELAY + 1; i++)
4543  st->pts_buffer[i] = AV_NOPTS_VALUE;
4544 
4545  st->sample_aspect_ratio = (AVRational) { 0, 1 };
4546 
4547 #if FF_API_R_FRAME_RATE
4548  st->info->last_dts = AV_NOPTS_VALUE;
4549 #endif
4552 
4554 
4555  st->internal->need_context_update = 1;
4556 
4557  s->streams[s->nb_streams++] = st;
4558  return st;
4559 fail:
4560  free_stream(&st);
4561  return NULL;
4562 }
4563 
4565 {
4566  AVProgram *program = NULL;
4567  int i;
4568 
4569  av_log(ac, AV_LOG_TRACE, "new_program: id=0x%04x\n", id);
4570 
4571  for (i = 0; i < ac->nb_programs; i++)
4572  if (ac->programs[i]->id == id)
4573  program = ac->programs[i];
4574 
4575  if (!program) {
4576  program = av_mallocz(sizeof(AVProgram));
4577  if (!program)
4578  return NULL;
4579  dynarray_add(&ac->programs, &ac->nb_programs, program);
4580  program->discard = AVDISCARD_NONE;
4581  program->pmt_version = -1;
4582  }
4583  program-&g