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  ffio_set_buf_size(s->pb, pos_delta);
2140  s->pb->short_seek_threshold = FFMAX(s->pb->short_seek_threshold, pos_delta/2);
2141  }
2142 
2143  if (skip < (1<<23)) {
2145  }
2146 }
2147 
2148 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp, int flags)
2149 {
2151  wanted_timestamp, flags);
2152 }
2153 
2154 static int64_t ff_read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit,
2155  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2156 {
2157  int64_t ts = read_timestamp(s, stream_index, ppos, pos_limit);
2158  if (stream_index >= 0)
2159  ts = wrap_timestamp(s->streams[stream_index], ts);
2160  return ts;
2161 }
2162 
2163 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
2164  int64_t target_ts, int flags)
2165 {
2166  const AVInputFormat *avif = s->iformat;
2167  int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;
2168  int64_t ts_min, ts_max, ts;
2169  int index;
2170  int64_t ret;
2171  AVStream *st;
2172 
2173  if (stream_index < 0)
2174  return -1;
2175 
2176  av_log(s, AV_LOG_TRACE, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2177 
2178  ts_max =
2179  ts_min = AV_NOPTS_VALUE;
2180  pos_limit = -1; // GCC falsely says it may be uninitialized.
2181 
2182  st = s->streams[stream_index];
2183  if (st->index_entries) {
2184  AVIndexEntry *e;
2185 
2186  /* FIXME: Whole function must be checked for non-keyframe entries in
2187  * index case, especially read_timestamp(). */
2188  index = av_index_search_timestamp(st, target_ts,
2189  flags | AVSEEK_FLAG_BACKWARD);
2190  index = FFMAX(index, 0);
2191  e = &st->index_entries[index];
2192 
2193  if (e->timestamp <= target_ts || e->pos == e->min_distance) {
2194  pos_min = e->pos;
2195  ts_min = e->timestamp;
2196  av_log(s, AV_LOG_TRACE, "using cached pos_min=0x%"PRIx64" dts_min=%s\n",
2197  pos_min, av_ts2str(ts_min));
2198  } else {
2199  av_assert1(index == 0);
2200  }
2201 
2202  index = av_index_search_timestamp(st, target_ts,
2203  flags & ~AVSEEK_FLAG_BACKWARD);
2204  av_assert0(index < st->nb_index_entries);
2205  if (index >= 0) {
2206  e = &st->index_entries[index];
2207  av_assert1(e->timestamp >= target_ts);
2208  pos_max = e->pos;
2209  ts_max = e->timestamp;
2210  pos_limit = pos_max - e->min_distance;
2211  av_log(s, AV_LOG_TRACE, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64
2212  " dts_max=%s\n", pos_max, pos_limit, av_ts2str(ts_max));
2213  }
2214  }
2215 
2216  pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
2217  ts_min, ts_max, flags, &ts, avif->read_timestamp);
2218  if (pos < 0)
2219  return -1;
2220 
2221  /* do the seek */
2222  if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
2223  return ret;
2224 
2226  ff_update_cur_dts(s, st, ts);
2227 
2228  return 0;
2229 }
2230 
2231 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
2232  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2233 {
2234  int64_t step = 1024;
2235  int64_t limit, ts_max;
2236  int64_t filesize = avio_size(s->pb);
2237  int64_t pos_max = filesize - 1;
2238  do {
2239  limit = pos_max;
2240  pos_max = FFMAX(0, (pos_max) - step);
2241  ts_max = ff_read_timestamp(s, stream_index,
2242  &pos_max, limit, read_timestamp);
2243  step += step;
2244  } while (ts_max == AV_NOPTS_VALUE && 2*limit > step);
2245  if (ts_max == AV_NOPTS_VALUE)
2246  return -1;
2247 
2248  for (;;) {
2249  int64_t tmp_pos = pos_max + 1;
2250  int64_t tmp_ts = ff_read_timestamp(s, stream_index,
2251  &tmp_pos, INT64_MAX, read_timestamp);
2252  if (tmp_ts == AV_NOPTS_VALUE)
2253  break;
2254  av_assert0(tmp_pos > pos_max);
2255  ts_max = tmp_ts;
2256  pos_max = tmp_pos;
2257  if (tmp_pos >= filesize)
2258  break;
2259  }
2260 
2261  if (ts)
2262  *ts = ts_max;
2263  if (pos)
2264  *pos = pos_max;
2265 
2266  return 0;
2267 }
2268 
2269 int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts,
2270  int64_t pos_min, int64_t pos_max, int64_t pos_limit,
2271  int64_t ts_min, int64_t ts_max,
2272  int flags, int64_t *ts_ret,
2273  int64_t (*read_timestamp)(struct AVFormatContext *, int,
2274  int64_t *, int64_t))
2275 {
2276  int64_t pos, ts;
2277  int64_t start_pos;
2278  int no_change;
2279  int ret;
2280 
2281  av_log(s, AV_LOG_TRACE, "gen_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2282 
2283  if (ts_min == AV_NOPTS_VALUE) {
2284  pos_min = s->internal->data_offset;
2285  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2286  if (ts_min == AV_NOPTS_VALUE)
2287  return -1;
2288  }
2289 
2290  if (ts_min >= target_ts) {
2291  *ts_ret = ts_min;
2292  return pos_min;
2293  }
2294 
2295  if (ts_max == AV_NOPTS_VALUE) {
2296  if ((ret = ff_find_last_ts(s, stream_index, &ts_max, &pos_max, read_timestamp)) < 0)
2297  return ret;
2298  pos_limit = pos_max;
2299  }
2300 
2301  if (ts_max <= target_ts) {
2302  *ts_ret = ts_max;
2303  return pos_max;
2304  }
2305 
2306  av_assert0(ts_min < ts_max);
2307 
2308  no_change = 0;
2309  while (pos_min < pos_limit) {
2310  av_log(s, AV_LOG_TRACE,
2311  "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%s dts_max=%s\n",
2312  pos_min, pos_max, av_ts2str(ts_min), av_ts2str(ts_max));
2313  av_assert0(pos_limit <= pos_max);
2314 
2315  if (no_change == 0) {
2316  int64_t approximate_keyframe_distance = pos_max - pos_limit;
2317  // interpolate position (better than dichotomy)
2318  pos = av_rescale(target_ts - ts_min, pos_max - pos_min,
2319  ts_max - ts_min) +
2320  pos_min - approximate_keyframe_distance;
2321  } else if (no_change == 1) {
2322  // bisection if interpolation did not change min / max pos last time
2323  pos = (pos_min + pos_limit) >> 1;
2324  } else {
2325  /* linear search if bisection failed, can only happen if there
2326  * are very few or no keyframes between min/max */
2327  pos = pos_min;
2328  }
2329  if (pos <= pos_min)
2330  pos = pos_min + 1;
2331  else if (pos > pos_limit)
2332  pos = pos_limit;
2333  start_pos = pos;
2334 
2335  // May pass pos_limit instead of -1.
2336  ts = ff_read_timestamp(s, stream_index, &pos, INT64_MAX, read_timestamp);
2337  if (pos == pos_max)
2338  no_change++;
2339  else
2340  no_change = 0;
2341  av_log(s, AV_LOG_TRACE, "%"PRId64" %"PRId64" %"PRId64" / %s %s %s"
2342  " target:%s limit:%"PRId64" start:%"PRId64" noc:%d\n",
2343  pos_min, pos, pos_max,
2344  av_ts2str(ts_min), av_ts2str(ts), av_ts2str(ts_max), av_ts2str(target_ts),
2345  pos_limit, start_pos, no_change);
2346  if (ts == AV_NOPTS_VALUE) {
2347  av_log(s, AV_LOG_ERROR, "read_timestamp() failed in the middle\n");
2348  return -1;
2349  }
2350  if (target_ts <= ts) {
2351  pos_limit = start_pos - 1;
2352  pos_max = pos;
2353  ts_max = ts;
2354  }
2355  if (target_ts >= ts) {
2356  pos_min = pos;
2357  ts_min = ts;
2358  }
2359  }
2360 
2361  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
2362  ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
2363 #if 0
2364  pos_min = pos;
2365  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2366  pos_min++;
2367  ts_max = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2368  av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" %s<=%s<=%s\n",
2369  pos, av_ts2str(ts_min), av_ts2str(target_ts), av_ts2str(ts_max));
2370 #endif
2371  *ts_ret = ts;
2372  return pos;
2373 }
2374 
2375 static int seek_frame_byte(AVFormatContext *s, int stream_index,
2376  int64_t pos, int flags)
2377 {
2378  int64_t pos_min, pos_max;
2379 
2380  pos_min = s->internal->data_offset;
2381  pos_max = avio_size(s->pb) - 1;
2382 
2383  if (pos < pos_min)
2384  pos = pos_min;
2385  else if (pos > pos_max)
2386  pos = pos_max;
2387 
2388  avio_seek(s->pb, pos, SEEK_SET);
2389 
2390  s->io_repositioned = 1;
2391 
2392  return 0;
2393 }
2394 
2395 static int seek_frame_generic(AVFormatContext *s, int stream_index,
2396  int64_t timestamp, int flags)
2397 {
2398  int index;
2399  int64_t ret;
2400  AVStream *st;
2401  AVIndexEntry *ie;
2402 
2403  st = s->streams[stream_index];
2404 
2405  index = av_index_search_timestamp(st, timestamp, flags);
2406 
2407  if (index < 0 && st->nb_index_entries &&
2408  timestamp < st->index_entries[0].timestamp)
2409  return -1;
2410 
2411  if (index < 0 || index == st->nb_index_entries - 1) {
2412  AVPacket pkt;
2413  int nonkey = 0;
2414 
2415  if (st->nb_index_entries) {
2417  ie = &st->index_entries[st->nb_index_entries - 1];
2418  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2419  return ret;
2420  ff_update_cur_dts(s, st, ie->timestamp);
2421  } else {
2422  if ((ret = avio_seek(s->pb, s->internal->data_offset, SEEK_SET)) < 0)
2423  return ret;
2424  }
2425  for (;;) {
2426  int read_status;
2427  do {
2428  read_status = av_read_frame(s, &pkt);
2429  } while (read_status == AVERROR(EAGAIN));
2430  if (read_status < 0)
2431  break;
2432  if (stream_index == pkt.stream_index && pkt.dts > timestamp) {
2433  if (pkt.flags & AV_PKT_FLAG_KEY) {
2434  av_packet_unref(&pkt);
2435  break;
2436  }
2437  if (nonkey++ > 1000 && st->codecpar->codec_id != AV_CODEC_ID_CDGRAPHICS) {
2438  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);
2439  av_packet_unref(&pkt);
2440  break;
2441  }
2442  }
2443  av_packet_unref(&pkt);
2444  }
2445  index = av_index_search_timestamp(st, timestamp, flags);
2446  }
2447  if (index < 0)
2448  return -1;
2449 
2451  if (s->iformat->read_seek)
2452  if (s->iformat->read_seek(s, stream_index, timestamp, flags) >= 0)
2453  return 0;
2454  ie = &st->index_entries[index];
2455  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2456  return ret;
2457  ff_update_cur_dts(s, st, ie->timestamp);
2458 
2459  return 0;
2460 }
2461 
2462 static int seek_frame_internal(AVFormatContext *s, int stream_index,
2463  int64_t timestamp, int flags)
2464 {
2465  int ret;
2466  AVStream *st;
2467 
2468  if (flags & AVSEEK_FLAG_BYTE) {
2469  if (s->iformat->flags & AVFMT_NO_BYTE_SEEK)
2470  return -1;
2472  return seek_frame_byte(s, stream_index, timestamp, flags);
2473  }
2474 
2475  if (stream_index < 0) {
2476  stream_index = av_find_default_stream_index(s);
2477  if (stream_index < 0)
2478  return -1;
2479 
2480  st = s->streams[stream_index];
2481  /* timestamp for default must be expressed in AV_TIME_BASE units */
2482  timestamp = av_rescale(timestamp, st->time_base.den,
2483  AV_TIME_BASE * (int64_t) st->time_base.num);
2484  }
2485 
2486  /* first, we try the format specific seek */
2487  if (s->iformat->read_seek) {
2489  ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
2490  } else
2491  ret = -1;
2492  if (ret >= 0)
2493  return 0;
2494 
2495  if (s->iformat->read_timestamp &&
2496  !(s->iformat->flags & AVFMT_NOBINSEARCH)) {
2498  return ff_seek_frame_binary(s, stream_index, timestamp, flags);
2499  } else if (!(s->iformat->flags & AVFMT_NOGENSEARCH)) {
2501  return seek_frame_generic(s, stream_index, timestamp, flags);
2502  } else
2503  return -1;
2504 }
2505 
2506 int av_seek_frame(AVFormatContext *s, int stream_index,
2507  int64_t timestamp, int flags)
2508 {
2509  int ret;
2510 
2511  if (s->iformat->read_seek2 && !s->iformat->read_seek) {
2512  int64_t min_ts = INT64_MIN, max_ts = INT64_MAX;
2513  if ((flags & AVSEEK_FLAG_BACKWARD))
2514  max_ts = timestamp;
2515  else
2516  min_ts = timestamp;
2517  return avformat_seek_file(s, stream_index, min_ts, timestamp, max_ts,
2518  flags & ~AVSEEK_FLAG_BACKWARD);
2519  }
2520 
2521  ret = seek_frame_internal(s, stream_index, timestamp, flags);
2522 
2523  if (ret >= 0)
2525 
2526  return ret;
2527 }
2528 
2529 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
2530  int64_t ts, int64_t max_ts, int flags)
2531 {
2532  if (min_ts > ts || max_ts < ts)
2533  return -1;
2534  if (stream_index < -1 || stream_index >= (int)s->nb_streams)
2535  return AVERROR(EINVAL);
2536 
2537  if (s->seek2any>0)
2538  flags |= AVSEEK_FLAG_ANY;
2539  flags &= ~AVSEEK_FLAG_BACKWARD;
2540 
2541  if (s->iformat->read_seek2) {
2542  int ret;
2544 
2545  if (stream_index == -1 && s->nb_streams == 1) {
2546  AVRational time_base = s->streams[0]->time_base;
2547  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
2548  min_ts = av_rescale_rnd(min_ts, time_base.den,
2549  time_base.num * (int64_t)AV_TIME_BASE,
2551  max_ts = av_rescale_rnd(max_ts, time_base.den,
2552  time_base.num * (int64_t)AV_TIME_BASE,
2554  stream_index = 0;
2555  }
2556 
2557  ret = s->iformat->read_seek2(s, stream_index, min_ts,
2558  ts, max_ts, flags);
2559 
2560  if (ret >= 0)
2562  return ret;
2563  }
2564 
2565  if (s->iformat->read_timestamp) {
2566  // try to seek via read_timestamp()
2567  }
2568 
2569  // Fall back on old API if new is not implemented but old is.
2570  // Note the old API has somewhat different semantics.
2571  if (s->iformat->read_seek || 1) {
2572  int dir = (ts - (uint64_t)min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);
2573  int ret = av_seek_frame(s, stream_index, ts, flags | dir);
2574  if (ret<0 && ts != min_ts && max_ts != ts) {
2575  ret = av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);
2576  if (ret >= 0)
2577  ret = av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));
2578  }
2579  return ret;
2580  }
2581 
2582  // try some generic seek like seek_frame_generic() but with new ts semantics
2583  return -1; //unreachable
2584 }
2585 
2587 {
2589  return 0;
2590 }
2591 
2592 /*******************************************************/
2593 
2594 /**
2595  * Return TRUE if the stream has accurate duration in any stream.
2596  *
2597  * @return TRUE if the stream has accurate duration for at least one component.
2598  */
2600 {
2601  int i;
2602  AVStream *st;
2603 
2604  for (i = 0; i < ic->nb_streams; i++) {
2605  st = ic->streams[i];
2606  if (st->duration != AV_NOPTS_VALUE)
2607  return 1;
2608  }
2609  if (ic->duration != AV_NOPTS_VALUE)
2610  return 1;
2611  return 0;
2612 }
2613 
2614 /**
2615  * Estimate the stream timings from the one of each components.
2616  *
2617  * Also computes the global bitrate if possible.
2618  */
2620 {
2621  int64_t start_time, start_time1, start_time_text, end_time, end_time1, end_time_text;
2622  int64_t duration, duration1, duration_text, filesize;
2623  int i;
2624  AVProgram *p;
2625 
2626  start_time = INT64_MAX;
2627  start_time_text = INT64_MAX;
2628  end_time = INT64_MIN;
2629  end_time_text = INT64_MIN;
2630  duration = INT64_MIN;
2631  duration_text = INT64_MIN;
2632 
2633  for (i = 0; i < ic->nb_streams; i++) {
2634  AVStream *st = ic->streams[i];
2635  int is_text = st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ||
2637  if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
2638  start_time1 = av_rescale_q(st->start_time, st->time_base,
2639  AV_TIME_BASE_Q);
2640  if (is_text)
2641  start_time_text = FFMIN(start_time_text, start_time1);
2642  else
2643  start_time = FFMIN(start_time, start_time1);
2644  end_time1 = av_rescale_q_rnd(st->duration, st->time_base,
2647  if (end_time1 != AV_NOPTS_VALUE && (end_time1 > 0 ? start_time1 <= INT64_MAX - end_time1 : start_time1 >= INT64_MIN - end_time1)) {
2648  end_time1 += start_time1;
2649  if (is_text)
2650  end_time_text = FFMAX(end_time_text, end_time1);
2651  else
2652  end_time = FFMAX(end_time, end_time1);
2653  }
2654  for (p = NULL; (p = av_find_program_from_stream(ic, p, i)); ) {
2655  if (p->start_time == AV_NOPTS_VALUE || p->start_time > start_time1)
2656  p->start_time = start_time1;
2657  if (p->end_time < end_time1)
2658  p->end_time = end_time1;
2659  }
2660  }
2661  if (st->duration != AV_NOPTS_VALUE) {
2662  duration1 = av_rescale_q(st->duration, st->time_base,
2663  AV_TIME_BASE_Q);
2664  if (is_text)
2665  duration_text = FFMAX(duration_text, duration1);
2666  else
2667  duration = FFMAX(duration, duration1);
2668  }
2669  }
2670  if (start_time == INT64_MAX || (start_time > start_time_text && start_time - (uint64_t)start_time_text < AV_TIME_BASE))
2671  start_time = start_time_text;
2672  else if (start_time > start_time_text)
2673  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream starttime %f\n", start_time_text / (float)AV_TIME_BASE);
2674 
2675  if (end_time == INT64_MIN || (end_time < end_time_text && end_time_text - (uint64_t)end_time < AV_TIME_BASE))
2676  end_time = end_time_text;
2677  else if (end_time < end_time_text)
2678  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream endtime %f\n", end_time_text / (float)AV_TIME_BASE);
2679 
2680  if (duration == INT64_MIN || (duration < duration_text && duration_text - duration < AV_TIME_BASE))
2681  duration = duration_text;
2682  else if (duration < duration_text)
2683  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream duration %f\n", duration_text / (float)AV_TIME_BASE);
2684 
2685  if (start_time != INT64_MAX) {
2686  ic->start_time = start_time;
2687  if (end_time != INT64_MIN) {
2688  if (ic->nb_programs > 1) {
2689  for (i = 0; i < ic->nb_programs; i++) {
2690  p = ic->programs[i];
2691  if (p->start_time != AV_NOPTS_VALUE &&
2692  p->end_time > p->start_time &&
2693  p->end_time - (uint64_t)p->start_time <= INT64_MAX)
2694  duration = FFMAX(duration, p->end_time - p->start_time);
2695  }
2696  } else if (end_time >= start_time && end_time - (uint64_t)start_time <= INT64_MAX) {
2697  duration = FFMAX(duration, end_time - start_time);
2698  }
2699  }
2700  }
2701  if (duration != INT64_MIN && duration > 0 && ic->duration == AV_NOPTS_VALUE) {
2702  ic->duration = duration;
2703  }
2704  if (ic->pb && (filesize = avio_size(ic->pb)) > 0 && ic->duration > 0) {
2705  /* compute the bitrate */
2706  double bitrate = (double) filesize * 8.0 * AV_TIME_BASE /
2707  (double) ic->duration;
2708  if (bitrate >= 0 && bitrate <= INT64_MAX)
2709  ic->bit_rate = bitrate;
2710  }
2711 }
2712 
2714 {
2715  int i;
2716  AVStream *st;
2717 
2719  for (i = 0; i < ic->nb_streams; i++) {
2720  st = ic->streams[i];
2721  if (st->start_time == AV_NOPTS_VALUE) {
2722  if (ic->start_time != AV_NOPTS_VALUE)
2724  st->time_base);
2725  if (ic->duration != AV_NOPTS_VALUE)
2727  st->time_base);
2728  }
2729  }
2730 }
2731 
2733 {
2734  int64_t filesize, duration;
2735  int i, show_warning = 0;
2736  AVStream *st;
2737 
2738  /* if bit_rate is already set, we believe it */
2739  if (ic->bit_rate <= 0) {
2740  int64_t bit_rate = 0;
2741  for (i = 0; i < ic->nb_streams; i++) {
2742  st = ic->streams[i];
2743  if (st->codecpar->bit_rate <= 0 && st->internal->avctx->bit_rate > 0)
2744  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
2745  if (st->codecpar->bit_rate > 0) {
2746  if (INT64_MAX - st->codecpar->bit_rate < bit_rate) {
2747  bit_rate = 0;
2748  break;
2749  }
2750  bit_rate += st->codecpar->bit_rate;
2751  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->codec_info_nb_frames > 1) {
2752  // If we have a videostream with packets but without a bitrate
2753  // then consider the sum not known
2754  bit_rate = 0;
2755  break;
2756  }
2757  }
2758  ic->bit_rate = bit_rate;
2759  }
2760 
2761  /* if duration is already set, we believe it */
2762  if (ic->duration == AV_NOPTS_VALUE &&
2763  ic->bit_rate != 0) {
2764  filesize = ic->pb ? avio_size(ic->pb) : 0;
2765  if (filesize > ic->internal->data_offset) {
2766  filesize -= ic->internal->data_offset;
2767  for (i = 0; i < ic->nb_streams; i++) {
2768  st = ic->streams[i];
2769  if ( st->time_base.num <= INT64_MAX / ic->bit_rate
2770  && st->duration == AV_NOPTS_VALUE) {
2771  duration = av_rescale(8 * filesize, st->time_base.den,
2772  ic->bit_rate *
2773  (int64_t) st->time_base.num);
2774  st->duration = duration;
2775  show_warning = 1;
2776  }
2777  }
2778  }
2779  }
2780  if (show_warning)
2781  av_log(ic, AV_LOG_WARNING,
2782  "Estimating duration from bitrate, this may be inaccurate\n");
2783 }
2784 
2785 #define DURATION_MAX_READ_SIZE 250000LL
2786 #define DURATION_MAX_RETRY 6
2787 
2788 /* only usable for MPEG-PS streams */
2789 static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
2790 {
2791  AVPacket pkt1, *pkt = &pkt1;
2792  AVStream *st;
2793  int num, den, read_size, i, ret;
2794  int found_duration = 0;
2795  int is_end;
2796  int64_t filesize, offset, duration;
2797  int retry = 0;
2798 
2799  /* flush packet queue */
2800  flush_packet_queue(ic);
2801 
2802  for (i = 0; i < ic->nb_streams; i++) {
2803  st = ic->streams[i];
2804  if (st->start_time == AV_NOPTS_VALUE &&
2805  st->first_dts == AV_NOPTS_VALUE &&
2807  av_log(ic, AV_LOG_WARNING,
2808  "start time for stream %d is not set in estimate_timings_from_pts\n", i);
2809 
2810  if (st->parser) {
2811  av_parser_close(st->parser);
2812  st->parser = NULL;
2813  }
2814  }
2815 
2817  av_log(ic, AV_LOG_INFO, "Skipping duration calculation in estimate_timings_from_pts\n");
2818  goto skip_duration_calc;
2819  }
2820 
2821  av_opt_set(ic, "skip_changes", "1", AV_OPT_SEARCH_CHILDREN);
2822  /* estimate the end time (duration) */
2823  /* XXX: may need to support wrapping */
2824  filesize = ic->pb ? avio_size(ic->pb) : 0;
2825  do {
2826  is_end = found_duration;
2827  offset = filesize - (DURATION_MAX_READ_SIZE << retry);
2828  if (offset < 0)
2829  offset = 0;
2830 
2831  avio_seek(ic->pb, offset, SEEK_SET);
2832  read_size = 0;
2833  for (;;) {
2834  if (read_size >= DURATION_MAX_READ_SIZE << (FFMAX(retry - 1, 0)))
2835  break;
2836 
2837  do {
2838  ret = ff_read_packet(ic, pkt);
2839  } while (ret == AVERROR(EAGAIN));
2840  if (ret != 0)
2841  break;
2842  read_size += pkt->size;
2843  st = ic->streams[pkt->stream_index];
2844  if (pkt->pts != AV_NOPTS_VALUE &&
2845  (st->start_time != AV_NOPTS_VALUE ||
2846  st->first_dts != AV_NOPTS_VALUE)) {
2847  if (pkt->duration == 0) {
2848  ff_compute_frame_duration(ic, &num, &den, st, st->parser, pkt);
2849  if (den && num) {
2850  pkt->duration = av_rescale_rnd(1,
2851  num * (int64_t) st->time_base.den,
2852  den * (int64_t) st->time_base.num,
2853  AV_ROUND_DOWN);
2854  }
2855  }
2856  duration = pkt->pts + pkt->duration;
2857  found_duration = 1;
2858  if (st->start_time != AV_NOPTS_VALUE)
2859  duration -= st->start_time;
2860  else
2861  duration -= st->first_dts;
2862  if (duration > 0) {
2863  if (st->duration == AV_NOPTS_VALUE || st->info->last_duration<= 0 ||
2864  (st->duration < duration && FFABS(duration - st->info->last_duration) < 60LL*st->time_base.den / st->time_base.num))
2865  st->duration = duration;
2866  st->info->last_duration = duration;
2867  }
2868  }
2869  av_packet_unref(pkt);
2870  }
2871 
2872  /* check if all audio/video streams have valid duration */
2873  if (!is_end) {
2874  is_end = 1;
2875  for (i = 0; i < ic->nb_streams; i++) {
2876  st = ic->streams[i];
2877  switch (st->codecpar->codec_type) {
2878  case AVMEDIA_TYPE_VIDEO:
2879  case AVMEDIA_TYPE_AUDIO:
2880  if (st->duration == AV_NOPTS_VALUE)
2881  is_end = 0;
2882  }
2883  }
2884  }
2885  } while (!is_end &&
2886  offset &&
2887  ++retry <= DURATION_MAX_RETRY);
2888 
2889  av_opt_set(ic, "skip_changes", "0", AV_OPT_SEARCH_CHILDREN);
2890 
2891  /* warn about audio/video streams which duration could not be estimated */
2892  for (i = 0; i < ic->nb_streams; i++) {
2893  st = ic->streams[i];
2894  if (st->duration == AV_NOPTS_VALUE) {
2895  switch (st->codecpar->codec_type) {
2896  case AVMEDIA_TYPE_VIDEO:
2897  case AVMEDIA_TYPE_AUDIO:
2898  if (st->start_time != AV_NOPTS_VALUE || st->first_dts != AV_NOPTS_VALUE) {
2899  av_log(ic, AV_LOG_DEBUG, "stream %d : no PTS found at end of file, duration not set\n", i);
2900  } else
2901  av_log(ic, AV_LOG_DEBUG, "stream %d : no TS found at start of file, duration not set\n", i);
2902  }
2903  }
2904  }
2905 skip_duration_calc:
2907 
2908  avio_seek(ic->pb, old_offset, SEEK_SET);
2909  for (i = 0; i < ic->nb_streams; i++) {
2910  int j;
2911 
2912  st = ic->streams[i];
2913  st->cur_dts = st->first_dts;
2916  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
2917  st->pts_buffer[j] = AV_NOPTS_VALUE;
2918  }
2919 }
2920 
2921 static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
2922 {
2923  int64_t file_size;
2924 
2925  /* get the file size, if possible */
2926  if (ic->iformat->flags & AVFMT_NOFILE) {
2927  file_size = 0;
2928  } else {
2929  file_size = avio_size(ic->pb);
2930  file_size = FFMAX(0, file_size);
2931  }
2932 
2933  if ((!strcmp(ic->iformat->name, "mpeg") ||
2934  !strcmp(ic->iformat->name, "mpegts")) &&
2935  file_size && (ic->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
2936  /* get accurate estimate from the PTSes */
2937  estimate_timings_from_pts(ic, old_offset);
2939  } else if (has_duration(ic)) {
2940  /* at least one component has timings - we use them for all
2941  * the components */
2944  } else {
2945  /* less precise: use bitrate info */
2948  }
2950 
2951  {
2952  int i;
2953  AVStream av_unused *st;
2954  for (i = 0; i < ic->nb_streams; i++) {
2955  st = ic->streams[i];
2956  av_log(ic, AV_LOG_TRACE, "stream %d: start_time: %0.3f duration: %0.3f\n", i,
2957  (double) st->start_time * av_q2d(st->time_base),
2958  (double) st->duration * av_q2d(st->time_base));
2959  }
2960  av_log(ic, AV_LOG_TRACE,
2961  "format: start_time: %0.3f duration: %0.3f bitrate=%"PRId64" kb/s\n",
2962  (double) ic->start_time / AV_TIME_BASE,
2963  (double) ic->duration / AV_TIME_BASE,
2964  (int64_t)ic->bit_rate / 1000);
2965  }
2966 }
2967 
2968 static int has_codec_parameters(AVStream *st, const char **errmsg_ptr)
2969 {
2970  AVCodecContext *avctx = st->internal->avctx;
2971 
2972 #define FAIL(errmsg) do { \
2973  if (errmsg_ptr) \
2974  *errmsg_ptr = errmsg; \
2975  return 0; \
2976  } while (0)
2977 
2978  if ( avctx->codec_id == AV_CODEC_ID_NONE
2979  && avctx->codec_type != AVMEDIA_TYPE_DATA)
2980  FAIL("unknown codec");
2981  switch (avctx->codec_type) {
2982  case AVMEDIA_TYPE_AUDIO:
2983  if (!avctx->frame_size && determinable_frame_size(avctx))
2984  FAIL("unspecified frame size");
2985  if (st->info->found_decoder >= 0 &&
2986  avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
2987  FAIL("unspecified sample format");
2988  if (!avctx->sample_rate)
2989  FAIL("unspecified sample rate");
2990  if (!avctx->channels)
2991  FAIL("unspecified number of channels");
2992  if (st->info->found_decoder >= 0 && !st->nb_decoded_frames && avctx->codec_id == AV_CODEC_ID_DTS)
2993  FAIL("no decodable DTS frames");
2994  break;
2995  case AVMEDIA_TYPE_VIDEO:
2996  if (!avctx->width)
2997  FAIL("unspecified size");
2998  if (st->info->found_decoder >= 0 && avctx->pix_fmt == AV_PIX_FMT_NONE)
2999  FAIL("unspecified pixel format");
3002  FAIL("no frame in rv30/40 and no sar");
3003  break;
3004  case AVMEDIA_TYPE_SUBTITLE:
3005  if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
3006  FAIL("unspecified size");
3007  break;
3008  case AVMEDIA_TYPE_DATA:
3009  if (avctx->codec_id == AV_CODEC_ID_NONE) return 1;
3010  }
3011 
3012  return 1;
3013 }
3014 
3015 /* returns 1 or 0 if or if not decoded data was returned, or a negative error */
3018 {
3019  AVCodecContext *avctx = st->internal->avctx;
3020  const AVCodec *codec;
3021  int got_picture = 1, ret = 0;
3023  AVSubtitle subtitle;
3024  AVPacket pkt = *avpkt;
3025  int do_skip_frame = 0;
3026  enum AVDiscard skip_frame;
3027 
3028  if (!frame)
3029  return AVERROR(ENOMEM);
3030 
3031  if (!avcodec_is_open(avctx) &&
3032  st->info->found_decoder <= 0 &&
3033  (st->codecpar->codec_id != -st->info->found_decoder || !st->codecpar->codec_id)) {
3034  AVDictionary *thread_opt = NULL;
3035 
3036  codec = find_probe_decoder(s, st, st->codecpar->codec_id);
3037 
3038  if (!codec) {
3039  st->info->found_decoder = -st->codecpar->codec_id;
3040  ret = -1;
3041  goto fail;
3042  }
3043 
3044  /* Force thread count to 1 since the H.264 decoder will not extract
3045  * SPS and PPS to extradata during multi-threaded decoding. */
3046  av_dict_set(options ? options : &thread_opt, "threads", "1", 0);
3047  if (s->codec_whitelist)
3048  av_dict_set(options ? options : &thread_opt, "codec_whitelist", s->codec_whitelist, 0);
3049  ret = avcodec_open2(avctx, codec, options ? options : &thread_opt);
3050  if (!options)
3051  av_dict_free(&thread_opt);
3052  if (ret < 0) {
3053  st->info->found_decoder = -avctx->codec_id;
3054  goto fail;
3055  }
3056  st->info->found_decoder = 1;
3057  } else if (!st->info->found_decoder)
3058  st->info->found_decoder = 1;
3059 
3060  if (st->info->found_decoder < 0) {
3061  ret = -1;
3062  goto fail;
3063  }
3064 
3066  do_skip_frame = 1;
3067  skip_frame = avctx->skip_frame;
3068  avctx->skip_frame = AVDISCARD_ALL;
3069  }
3070 
3071  while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
3072  ret >= 0 &&
3074  (!st->codec_info_nb_frames &&
3076  got_picture = 0;
3077  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
3078  avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
3079  ret = avcodec_send_packet(avctx, &pkt);
3080  if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3081  break;
3082  if (ret >= 0)
3083  pkt.size = 0;
3084  ret = avcodec_receive_frame(avctx, frame);
3085  if (ret >= 0)
3086  got_picture = 1;
3087  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
3088  ret = 0;
3089  } else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
3090  ret = avcodec_decode_subtitle2(avctx, &subtitle,
3091  &got_picture, &pkt);
3092  if (ret >= 0)
3093  pkt.size = 0;
3094  }
3095  if (ret >= 0) {
3096  if (got_picture)
3097  st->nb_decoded_frames++;
3098  ret = got_picture;
3099  }
3100  }
3101 
3102  if (!pkt.data && !got_picture)
3103  ret = -1;
3104 
3105 fail:
3106  if (do_skip_frame) {
3107  avctx->skip_frame = skip_frame;
3108  }
3109 
3110  av_frame_free(&frame);
3111  return ret;
3112 }
3113 
3114 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
3115 {
3116  while (tags->id != AV_CODEC_ID_NONE) {
3117  if (tags->id == id)
3118  return tags->tag;
3119  tags++;
3120  }
3121  return 0;
3122 }
3123 
3124 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
3125 {
3126  int i;
3127  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3128  if (tag == tags[i].tag)
3129  return tags[i].id;
3130  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3131  if (avpriv_toupper4(tag) == avpriv_toupper4(tags[i].tag))
3132  return tags[i].id;
3133  return AV_CODEC_ID_NONE;
3134 }
3135 
3136 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
3137 {
3138  if (bps <= 0 || bps > 64)
3139  return AV_CODEC_ID_NONE;
3140 
3141  if (flt) {
3142  switch (bps) {
3143  case 32:
3145  case 64:
3147  default:
3148  return AV_CODEC_ID_NONE;
3149  }
3150  } else {
3151  bps += 7;
3152  bps >>= 3;
3153  if (sflags & (1 << (bps - 1))) {
3154  switch (bps) {
3155  case 1:
3156  return AV_CODEC_ID_PCM_S8;
3157  case 2:
3159  case 3:
3161  case 4:
3163  case 8:
3165  default:
3166  return AV_CODEC_ID_NONE;
3167  }
3168  } else {
3169  switch (bps) {
3170  case 1:
3171  return AV_CODEC_ID_PCM_U8;
3172  case 2:
3174  case 3:
3176  case 4:
3178  default:
3179  return AV_CODEC_ID_NONE;
3180  }
3181  }
3182  }
3183 }
3184 
3185 unsigned int av_codec_get_tag(const AVCodecTag *const *tags, enum AVCodecID id)
3186 {
3187  unsigned int tag;
3188  if (!av_codec_get_tag2(tags, id, &tag))
3189  return 0;
3190  return tag;
3191 }
3192 
3193 int av_codec_get_tag2(const AVCodecTag * const *tags, enum AVCodecID id,
3194  unsigned int *tag)
3195 {
3196  int i;
3197  for (i = 0; tags && tags[i]; i++) {
3198  const AVCodecTag *codec_tags = tags[i];
3199  while (codec_tags->id != AV_CODEC_ID_NONE) {
3200  if (codec_tags->id == id) {
3201  *tag = codec_tags->tag;
3202  return 1;
3203  }
3204  codec_tags++;
3205  }
3206  }
3207  return 0;
3208 }
3209 
3210 enum AVCodecID av_codec_get_id(const AVCodecTag *const *tags, unsigned int tag)
3211 {
3212  int i;
3213  for (i = 0; tags && tags[i]; i++) {
3214  enum AVCodecID id = ff_codec_get_id(tags[i], tag);
3215  if (id != AV_CODEC_ID_NONE)
3216  return id;
3217  }
3218  return AV_CODEC_ID_NONE;
3219 }
3220 
3222 {
3223  unsigned int i, j;
3224  int64_t max_time = 0;
3225 
3226  if (s->duration > 0 && s->start_time < INT64_MAX - s->duration)
3227  max_time = s->duration +
3228  ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
3229 
3230  for (i = 0; i < s->nb_chapters; i++)
3231  if (s->chapters[i]->end == AV_NOPTS_VALUE) {
3232  AVChapter *ch = s->chapters[i];
3233  int64_t end = max_time ? av_rescale_q(max_time, AV_TIME_BASE_Q,
3234  ch->time_base)
3235  : INT64_MAX;
3236 
3237  for (j = 0; j < s->nb_chapters; j++) {
3238  AVChapter *ch1 = s->chapters[j];
3239  int64_t next_start = av_rescale_q(ch1->start, ch1->time_base,
3240  ch->time_base);
3241  if (j != i && next_start > ch->start && next_start < end)
3242  end = next_start;
3243  }
3244  ch->end = (end == INT64_MAX || end < ch->start) ? ch->start : end;
3245  }
3246 }
3247 
3248 static int get_std_framerate(int i)
3249 {
3250  if (i < 30*12)
3251  return (i + 1) * 1001;
3252  i -= 30*12;
3253 
3254  if (i < 30)
3255  return (i + 31) * 1001 * 12;
3256  i -= 30;
3257 
3258  if (i < 3)
3259  return ((const int[]) { 80, 120, 240})[i] * 1001 * 12;
3260 
3261  i -= 3;
3262 
3263  return ((const int[]) { 24, 30, 60, 12, 15, 48 })[i] * 1000 * 12;
3264 }
3265 
3266 /* Is the time base unreliable?
3267  * This is a heuristic to balance between quick acceptance of the values in
3268  * the headers vs. some extra checks.
3269  * Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
3270  * MPEG-2 commonly misuses field repeat flags to store different framerates.
3271  * And there are "variable" fps files this needs to detect as well. */
3273 {
3274  if (c->time_base.den >= 101LL * c->time_base.num ||
3275  c->time_base.den < 5LL * c->time_base.num ||
3276  // c->codec_tag == AV_RL32("DIVX") ||
3277  // c->codec_tag == AV_RL32("XVID") ||
3278  c->codec_tag == AV_RL32("mp4v") ||
3280  c->codec_id == AV_CODEC_ID_GIF ||
3281  c->codec_id == AV_CODEC_ID_HEVC ||
3282  c->codec_id == AV_CODEC_ID_H264)
3283  return 1;
3284  return 0;
3285 }
3286 
3288 {
3289  av_freep(&par->extradata);
3290  par->extradata_size = 0;
3291 
3293  return AVERROR(EINVAL);
3294 
3296  if (!par->extradata)
3297  return AVERROR(ENOMEM);
3298 
3299  memset(par->extradata + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3300  par->extradata_size = size;
3301 
3302  return 0;
3303 }
3304 
3306 {
3307  int ret = ff_alloc_extradata(par, size);
3308  if (ret < 0)
3309  return ret;
3310  ret = avio_read(pb, par->extradata, size);
3311  if (ret != size) {
3312  av_freep(&par->extradata);
3313  par->extradata_size = 0;
3314  av_log(s, AV_LOG_ERROR, "Failed to read extradata of size %d\n", size);
3315  return ret < 0 ? ret : AVERROR_INVALIDDATA;
3316  }
3317 
3318  return ret;
3319 }
3320 
3321 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
3322 {
3323  int i, j;
3324  int64_t last = st->info->last_dts;
3325 
3326  if ( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
3327  && ts - (uint64_t)last < INT64_MAX) {
3328  double dts = (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
3329  int64_t duration = ts - last;
3330 
3331  if (!st->info->duration_error)
3332  st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
3333  if (!st->info->duration_error)
3334  return AVERROR(ENOMEM);
3335 
3336 // if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
3337 // av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
3338  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3339  if (st->info->duration_error[0][1][i] < 1e10) {
3340  int framerate = get_std_framerate(i);
3341  double sdts = dts*framerate/(1001*12);
3342  for (j= 0; j<2; j++) {
3343  int64_t ticks = llrint(sdts+j*0.5);
3344  double error= sdts - ticks + j*0.5;
3345  st->info->duration_error[j][0][i] += error;
3346  st->info->duration_error[j][1][i] += error*error;
3347  }
3348  }
3349  }
3350  st->info->duration_count++;
3352 
3353  if (st->info->duration_count % 10 == 0) {
3354  int n = st->info->duration_count;
3355  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3356  if (st->info->duration_error[0][1][i] < 1e10) {
3357  double a0 = st->info->duration_error[0][0][i] / n;
3358  double error0 = st->info->duration_error[0][1][i] / n - a0*a0;
3359  double a1 = st->info->duration_error[1][0][i] / n;
3360  double error1 = st->info->duration_error[1][1][i] / n - a1*a1;
3361  if (error0 > 0.04 && error1 > 0.04) {
3362  st->info->duration_error[0][1][i] = 2e10;
3363  st->info->duration_error[1][1][i] = 2e10;
3364  }
3365  }
3366  }
3367  }
3368 
3369  // ignore the first 4 values, they might have some random jitter
3370  if (st->info->duration_count > 3 && is_relative(ts) == is_relative(last))
3371  st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
3372  }
3373  if (ts != AV_NOPTS_VALUE)
3374  st->info->last_dts = ts;
3375 
3376  return 0;
3377 }
3378 
3380 {
3381  int i, j;
3382 
3383  for (i = 0; i < ic->nb_streams; i++) {
3384  AVStream *st = ic->streams[i];
3385 
3387  continue;
3388  // the check for tb_unreliable() is not completely correct, since this is not about handling
3389  // an unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
3390  // ipmovie.c produces.
3391  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)
3392  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);
3393  if (st->info->duration_count>1 && !st->r_frame_rate.num
3394  && tb_unreliable(st->internal->avctx)) {
3395  int num = 0;
3396  double best_error= 0.01;
3397  AVRational ref_rate = st->r_frame_rate.num ? st->r_frame_rate : av_inv_q(st->time_base);
3398 
3399  for (j= 0; j<MAX_STD_TIMEBASES; j++) {
3400  int k;
3401 
3402  if (st->info->codec_info_duration &&
3403  st->info->codec_info_duration*av_q2d(st->time_base) < (1001*11.5)/get_std_framerate(j))
3404  continue;
3405  if (!st->info->codec_info_duration && get_std_framerate(j) < 1001*12)
3406  continue;
3407 
3408  if (av_q2d(st->time_base) * st->info->rfps_duration_sum / st->info->duration_count < (1001*12.0 * 0.8)/get_std_framerate(j))
3409  continue;
3410 
3411  for (k= 0; k<2; k++) {
3412  int n = st->info->duration_count;
3413  double a= st->info->duration_error[k][0][j] / n;
3414  double error= st->info->duration_error[k][1][j]/n - a*a;
3415 
3416  if (error < best_error && best_error> 0.000000001) {
3417  best_error= error;
3418  num = get_std_framerate(j);
3419  }
3420  if (error < 0.02)
3421  av_log(ic, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
3422  }
3423  }
3424  // do not increase frame rate by more than 1 % in order to match a standard rate.
3425  if (num && (!ref_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(ref_rate)))
3426  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
3427  }
3428  if ( !st->avg_frame_rate.num
3429  && st->r_frame_rate.num && st->info->rfps_duration_sum
3430  && st->info->codec_info_duration <= 0
3431  && st->info->duration_count > 2
3432  && 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
3433  ) {
3434  av_log(ic, AV_LOG_DEBUG, "Setting avg frame rate based on r frame rate\n");
3435  st->avg_frame_rate = st->r_frame_rate;
3436  }
3437 
3438  av_freep(&st->info->duration_error);
3439  st->info->last_dts = AV_NOPTS_VALUE;
3440  st->info->duration_count = 0;
3441  st->info->rfps_duration_sum = 0;
3442  }
3443 }
3444 
3446 {
3447  const AVBitStreamFilter *f;
3448 
3449  f = av_bsf_get_by_name("extract_extradata");
3450  if (!f)
3451  return 0;
3452 
3453  if (f->codec_ids) {
3454  const enum AVCodecID *ids;
3455  for (ids = f->codec_ids; *ids != AV_CODEC_ID_NONE; ids++)
3456  if (*ids == st->codecpar->codec_id)
3457  return 1;
3458  }
3459 
3460  return 0;
3461 }
3462 
3464 {
3465  AVStreamInternal *sti = st->internal;
3466  const AVBitStreamFilter *f;
3467  int ret;
3468 
3469  f = av_bsf_get_by_name("extract_extradata");
3470  if (!f)
3471  goto finish;
3472 
3473  /* check that the codec id is supported */
3474  ret = extract_extradata_check(st);
3475  if (!ret)
3476  goto finish;
3477 
3479  if (!sti->extract_extradata.pkt)
3480  return AVERROR(ENOMEM);
3481 
3482  ret = av_bsf_alloc(f, &sti->extract_extradata.bsf);
3483  if (ret < 0)
3484  goto fail;
3485 
3487  st->codecpar);
3488  if (ret < 0)
3489  goto fail;
3490 
3492 
3493  ret = av_bsf_init(sti->extract_extradata.bsf);
3494  if (ret < 0)
3495  goto fail;
3496 
3497 finish:
3498  sti->extract_extradata.inited = 1;
3499 
3500  return 0;
3501 fail:
3504  return ret;
3505 }
3506 
3508 {
3509  AVStreamInternal *sti = st->internal;
3510  AVPacket *pkt_ref;
3511  int ret;
3512 
3513  if (!sti->extract_extradata.inited) {
3514  ret = extract_extradata_init(st);
3515  if (ret < 0)
3516  return ret;
3517  }
3518 
3519  if (sti->extract_extradata.inited && !sti->extract_extradata.bsf)
3520  return 0;
3521 
3522  pkt_ref = sti->extract_extradata.pkt;
3523  ret = av_packet_ref(pkt_ref, pkt);
3524  if (ret < 0)
3525  return ret;
3526 
3527  ret = av_bsf_send_packet(sti->extract_extradata.bsf, pkt_ref);
3528  if (ret < 0) {
3529  av_packet_unref(pkt_ref);
3530  return ret;
3531  }
3532 
3533  while (ret >= 0 && !sti->avctx->extradata) {
3534  int extradata_size;
3535  uint8_t *extradata;
3536 
3537  ret = av_bsf_receive_packet(sti->extract_extradata.bsf, pkt_ref);
3538  if (ret < 0) {
3539  if (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3540  return ret;
3541  continue;
3542  }
3543 
3545  &extradata_size);
3546 
3547  if (extradata) {
3548  av_assert0(!sti->avctx->extradata);
3549  if ((unsigned)extradata_size < FF_MAX_EXTRADATA_SIZE)
3550  sti->avctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
3551  if (!sti->avctx->extradata) {
3552  av_packet_unref(pkt_ref);
3553  return AVERROR(ENOMEM);
3554  }
3555  memcpy(sti->avctx->extradata, extradata, extradata_size);
3556  sti->avctx->extradata_size = extradata_size;
3557  }
3558  av_packet_unref(pkt_ref);
3559  }
3560 
3561  return 0;
3562 }
3563 
3565 {
3566  int i, count = 0, ret = 0, j;
3567  int64_t read_size;
3568  AVStream *st;
3569  AVCodecContext *avctx;
3570  AVPacket pkt1, *pkt;
3571  int64_t old_offset = avio_tell(ic->pb);
3572  // new streams might appear, no options for those
3573  int orig_nb_streams = ic->nb_streams;
3574  int flush_codecs;
3575  int64_t max_analyze_duration = ic->max_analyze_duration;
3576  int64_t max_stream_analyze_duration;
3577  int64_t max_subtitle_analyze_duration;
3578  int64_t probesize = ic->probesize;
3579  int eof_reached = 0;
3580  int *missing_streams = av_opt_ptr(ic->iformat->priv_class, ic->priv_data, "missing_streams");
3581 
3582  flush_codecs = probesize > 0;
3583 
3584  av_opt_set(ic, "skip_clear", "1", AV_OPT_SEARCH_CHILDREN);
3585 
3586  max_stream_analyze_duration = max_analyze_duration;
3587  max_subtitle_analyze_duration = max_analyze_duration;
3588  if (!max_analyze_duration) {
3589  max_stream_analyze_duration =
3590  max_analyze_duration = 5*AV_TIME_BASE;
3591  max_subtitle_analyze_duration = 30*AV_TIME_BASE;
3592  if (!strcmp(ic->iformat->name, "flv"))
3593  max_stream_analyze_duration = 90*AV_TIME_BASE;
3594  if (!strcmp(ic->iformat->name, "mpeg") || !strcmp(ic->iformat->name, "mpegts"))
3595  max_stream_analyze_duration = 7*AV_TIME_BASE;
3596  }
3597 
3598  if (ic->pb)
3599  av_log(ic, AV_LOG_DEBUG, "Before avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d nb_streams:%d\n",
3600  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, ic->nb_streams);
3601 
3602  for (i = 0; i < ic->nb_streams; i++) {
3603  const AVCodec *codec;
3604  AVDictionary *thread_opt = NULL;
3605  st = ic->streams[i];
3606  avctx = st->internal->avctx;
3607 
3608  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
3610 /* if (!st->time_base.num)
3611  st->time_base = */
3612  if (!avctx->time_base.num)
3613  avctx->time_base = st->time_base;
3614  }
3615 
3616  /* check if the caller has overridden the codec id */
3617 #if FF_API_LAVF_AVCTX
3619  if (st->codec->codec_id != st->internal->orig_codec_id) {
3620  st->codecpar->codec_id = st->codec->codec_id;
3621  st->codecpar->codec_type = st->codec->codec_type;
3622  st->internal->orig_codec_id = st->codec->codec_id;
3623  }
3625 #endif
3626  // only for the split stuff
3627  if (!st->parser && !(ic->flags & AVFMT_FLAG_NOPARSE) && st->request_probe <= 0) {
3628  st->parser = av_parser_init(st->codecpar->codec_id);
3629  if (st->parser) {
3630  if (st->need_parsing == AVSTREAM_PARSE_HEADERS) {
3632  } else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW) {
3634  }
3635  } else if (st->need_parsing) {
3636  av_log(ic, AV_LOG_VERBOSE, "parser not found for codec "
3637  "%s, packets or times may be invalid.\n",
3639  }
3640  }
3641 
3642  if (st->codecpar->codec_id != st->internal->orig_codec_id)
3644 
3646  if (ret < 0)
3647  goto find_stream_info_err;
3648  if (st->request_probe <= 0)
3649  st->internal->avctx_inited = 1;
3650 
3651  codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3652 
3653  /* Force thread count to 1 since the H.264 decoder will not extract
3654  * SPS and PPS to extradata during multi-threaded decoding. */
3655  av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
3656 
3657  if (ic->codec_whitelist)
3658  av_dict_set(options ? &options[i] : &thread_opt, "codec_whitelist", ic->codec_whitelist, 0);
3659 
3660  /* Ensure that subtitle_header is properly set. */
3662  && codec && !avctx->codec) {
3663  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3664  av_log(ic, AV_LOG_WARNING,
3665  "Failed to open codec in %s\n",__FUNCTION__);
3666  }
3667 
3668  // Try to just open decoders, in case this is enough to get parameters.
3669  if (!has_codec_parameters(st, NULL) && st->request_probe <= 0) {
3670  if (codec && !avctx->codec)
3671  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3672  av_log(ic, AV_LOG_WARNING,
3673  "Failed to open codec in %s\n",__FUNCTION__);
3674  }
3675  if (!options)
3676  av_dict_free(&thread_opt);
3677  }
3678 
3679  for (i = 0; i < ic->nb_streams; i++) {
3680 #if FF_API_R_FRAME_RATE
3682 #endif
3685  }
3686 
3687  read_size = 0;
3688  for (;;) {
3689  int analyzed_all_streams;
3691  ret = AVERROR_EXIT;
3692  av_log(ic, AV_LOG_DEBUG, "interrupted\n");
3693  break;
3694  }
3695 
3696  /* check if one codec still needs to be handled */
3697  for (i = 0; i < ic->nb_streams; i++) {
3698  int fps_analyze_framecount = 20;
3699  int count;
3700 
3701  st = ic->streams[i];
3702  if (!has_codec_parameters(st, NULL))
3703  break;
3704  /* If the timebase is coarse (like the usual millisecond precision
3705  * of mkv), we need to analyze more frames to reliably arrive at
3706  * the correct fps. */
3707  if (av_q2d(st->time_base) > 0.0005)
3708  fps_analyze_framecount *= 2;
3709  if (!tb_unreliable(st->internal->avctx))
3710  fps_analyze_framecount = 0;
3711  if (ic->fps_probe_size >= 0)
3712  fps_analyze_framecount = ic->fps_probe_size;
3714  fps_analyze_framecount = 0;
3715  /* variable fps and no guess at the real fps */
3716  count = (ic->iformat->flags & AVFMT_NOTIMESTAMPS) ?
3718  st->info->duration_count;
3719  if (!(st->r_frame_rate.num && st->avg_frame_rate.num) &&
3721  if (count < fps_analyze_framecount)
3722  break;
3723  }
3724  // Look at the first 3 frames if there is evidence of frame delay
3725  // but the decoder delay is not set.
3726  if (st->info->frame_delay_evidence && count < 2 && st->internal->avctx->has_b_frames == 0)
3727  break;
3728  if (!st->internal->avctx->extradata &&
3730  st->internal->extract_extradata.bsf) &&
3732  break;
3733  if (st->first_dts == AV_NOPTS_VALUE &&
3734  !(ic->iformat->flags & AVFMT_NOTIMESTAMPS) &&
3738  break;
3739  }
3740  analyzed_all_streams = 0;
3741  if (!missing_streams || !*missing_streams)
3742  if (i == ic->nb_streams) {
3743  analyzed_all_streams = 1;
3744  /* NOTE: If the format has no header, then we need to read some
3745  * packets to get most of the streams, so we cannot stop here. */
3746  if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
3747  /* If we found the info for all the codecs, we can stop. */
3748  ret = count;
3749  av_log(ic, AV_LOG_DEBUG, "All info found\n");
3750  flush_codecs = 0;
3751  break;
3752  }
3753  }
3754  /* We did not get all the codec info, but we read too much data. */
3755  if (read_size >= probesize) {
3756  ret = count;
3757  av_log(ic, AV_LOG_DEBUG,
3758  "Probe buffer size limit of %"PRId64" bytes reached\n", probesize);
3759  for (i = 0; i < ic->nb_streams; i++)
3760  if (!ic->streams[i]->r_frame_rate.num &&
3761  ic->streams[i]->info->duration_count <= 1 &&
3763  strcmp(ic->iformat->name, "image2"))
3764  av_log(ic, AV_LOG_WARNING,
3765  "Stream #%d: not enough frames to estimate rate; "
3766  "consider increasing probesize\n", i);
3767  break;
3768  }
3769 
3770  /* NOTE: A new stream can be added there if no header in file
3771  * (AVFMTCTX_NOHEADER). */
3772  ret = read_frame_internal(ic, &pkt1);
3773  if (ret == AVERROR(EAGAIN))
3774  continue;
3775 
3776  if (ret < 0) {
3777  /* EOF or error*/
3778  eof_reached = 1;
3779  break;
3780  }
3781 
3782  pkt = &pkt1;
3783 
3784  if (!(ic->flags & AVFMT_FLAG_NOBUFFER)) {
3787  pkt, 0);
3788  if (ret < 0)
3789  goto find_stream_info_err;
3790  }
3791 
3792  st = ic->streams[pkt->stream_index];
3794  read_size += pkt->size;
3795 
3796  avctx = st->internal->avctx;
3797  if (!st->internal->avctx_inited) {
3799  if (ret < 0)
3800  goto find_stream_info_err;
3801  st->internal->avctx_inited = 1;
3802  }
3803 
3804  if (pkt->dts != AV_NOPTS_VALUE && st->codec_info_nb_frames > 1) {
3805  /* check for non-increasing dts */
3806  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3807  st->info->fps_last_dts >= pkt->dts) {
3808  av_log(ic, AV_LOG_DEBUG,
3809  "Non-increasing DTS in stream %d: packet %d with DTS "
3810  "%"PRId64", packet %d with DTS %"PRId64"\n",
3811  st->index, st->info->fps_last_dts_idx,
3813  pkt->dts);
3814  st->info->fps_first_dts =
3816  }
3817  /* Check for a discontinuity in dts. If the difference in dts
3818  * is more than 1000 times the average packet duration in the
3819  * sequence, we treat it as a discontinuity. */
3820  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3822  (pkt->dts - (uint64_t)st->info->fps_last_dts) / 1000 >
3823  (st->info->fps_last_dts - (uint64_t)st->info->fps_first_dts) /
3824  (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
3825  av_log(ic, AV_LOG_WARNING,
3826  "DTS discontinuity in stream %d: packet %d with DTS "
3827  "%"PRId64", packet %d with DTS %"PRId64"\n",
3828  st->index, st->info->fps_last_dts_idx,
3830  pkt->dts);
3831  st->info->fps_first_dts =
3833  }
3834 
3835  /* update stored dts values */
3836  if (st->info->fps_first_dts == AV_NOPTS_VALUE) {
3837  st->info->fps_first_dts = pkt->dts;
3839  }
3840  st->info->fps_last_dts = pkt->dts;
3842  }
3843  if (st->codec_info_nb_frames>1) {
3844  int64_t t = 0;
3845  int64_t limit;
3846 
3847  if (st->time_base.den > 0)
3849  if (st->avg_frame_rate.num > 0)
3851 
3852  if ( t == 0
3853  && st->codec_info_nb_frames>30
3854  && st->info->fps_first_dts != AV_NOPTS_VALUE
3855  && st->info->fps_last_dts != AV_NOPTS_VALUE)
3857 
3858  if (analyzed_all_streams) limit = max_analyze_duration;
3859  else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) limit = max_subtitle_analyze_duration;
3860  else limit = max_stream_analyze_duration;
3861 
3862  if (t >= limit) {
3863  av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds st:%d\n",
3864  limit,
3865  t, pkt->stream_index);
3866  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3867  av_packet_unref(pkt);
3868  break;
3869  }
3870  if (pkt->duration) {
3871  if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE && pkt->pts != AV_NOPTS_VALUE && st->start_time != AV_NOPTS_VALUE && pkt->pts >= st->start_time) {
3872  st->info->codec_info_duration = FFMIN(pkt->pts - st->start_time, st->info->codec_info_duration + pkt->duration);
3873  } else
3874  st->info->codec_info_duration += pkt->duration;
3875  st->info->codec_info_duration_fields += st->parser && st->need_parsing && avctx->ticks_per_frame ==2 ? st->parser->repeat_pict + 1 : 2;
3876  }
3877  }
3878  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
3879 #if FF_API_R_FRAME_RATE
3880  ff_rfps_add_frame(ic, st, pkt->dts);
3881 #endif
3882  if (pkt->dts != pkt->pts && pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE)
3883  st->info->frame_delay_evidence = 1;
3884  }
3885  if (!st->internal->avctx->extradata) {
3886  ret = extract_extradata(st, pkt);
3887  if (ret < 0)
3888  goto find_stream_info_err;
3889  }
3890 
3891  /* If still no information, we try to open the codec and to
3892  * decompress the frame. We try to avoid that in most cases as
3893  * it takes longer and uses more memory. For MPEG-4, we need to
3894  * decompress for QuickTime.
3895  *
3896  * If AV_CODEC_CAP_CHANNEL_CONF is set this will force decoding of at
3897  * least one frame of codec data, this makes sure the codec initializes
3898  * the channel configuration and does not only trust the values from
3899  * the container. */
3900  try_decode_frame(ic, st, pkt,
3901  (options && i < orig_nb_streams) ? &options[i] : NULL);
3902 
3903  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3904  av_packet_unref(pkt);
3905 
3906  st->codec_info_nb_frames++;
3907  count++;
3908  }
3909 
3910  if (eof_reached) {
3911  int stream_index;
3912  for (stream_index = 0; stream_index < ic->nb_streams; stream_index++) {
3913  st = ic->streams[stream_index];
3914  avctx = st->internal->avctx;
3915  if (!has_codec_parameters(st, NULL)) {
3916  const AVCodec *codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3917  if (codec && !avctx->codec) {
3918  AVDictionary *opts = NULL;
3919  if (ic->codec_whitelist)
3920  av_dict_set(&opts, "codec_whitelist", ic->codec_whitelist, 0);
3921  if (avcodec_open2(avctx, codec, (options && stream_index < orig_nb_streams) ? &options[stream_index] : &opts) < 0)
3922  av_log(ic, AV_LOG_WARNING,
3923  "Failed to open codec in %s\n",__FUNCTION__);
3924  av_dict_free(&opts);
3925  }
3926  }
3927 
3928  // EOF already reached while reading the stream above.
3929  // So continue with reoordering DTS with whatever delay we have.
3931  update_dts_from_pts(ic, stream_index, ic->internal->packet_buffer);
3932  }
3933  }
3934  }
3935 
3936  if (flush_codecs) {
3937  AVPacket empty_pkt = { 0 };
3938  int err = 0;
3939  av_init_packet(&empty_pkt);
3940 
3941  for (i = 0; i < ic->nb_streams; i++) {
3942 
3943  st = ic->streams[i];
3944 
3945  /* flush the decoders */
3946  if (st->info->found_decoder == 1) {
3947  do {
3948  err = try_decode_frame(ic, st, &empty_pkt,
3949  (options && i < orig_nb_streams)
3950  ? &options[i] : NULL);
3951  } while (err > 0 && !has_codec_parameters(st, NULL));
3952 
3953  if (err < 0) {
3954  av_log(ic, AV_LOG_INFO,
3955  "decoding for stream %d failed\n", st->index);
3956  }
3957  }
3958  }
3959  }
3960 
3961  ff_rfps_calculate(ic);
3962 
3963  for (i = 0; i < ic->nb_streams; i++) {
3964  st = ic->streams[i];
3965  avctx = st->internal->avctx;
3966  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
3967  if (avctx->codec_id == AV_CODEC_ID_RAWVIDEO && !avctx->codec_tag && !avctx->bits_per_coded_sample) {
3968  uint32_t tag= avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
3970  avctx->codec_tag= tag;
3971  }
3972 
3973  /* estimate average framerate if not set by demuxer */
3974  if (st->info->codec_info_duration_fields &&
3975  !st->avg_frame_rate.num &&
3976  st->info->codec_info_duration) {
3977  int best_fps = 0;
3978  double best_error = 0.01;
3979  AVRational codec_frame_rate = avctx->framerate;
3980 
3981  if (st->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
3982  st->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
3983  st->info->codec_info_duration < 0)
3984  continue;
3986  st->info->codec_info_duration_fields * (int64_t) st->time_base.den,
3987  st->info->codec_info_duration * 2 * (int64_t) st->time_base.num, 60000);
3988 
3989  /* Round guessed framerate to a "standard" framerate if it's
3990  * within 1% of the original estimate. */
3991  for (j = 0; j < MAX_STD_TIMEBASES; j++) {
3992  AVRational std_fps = { get_std_framerate(j), 12 * 1001 };
3993  double error = fabs(av_q2d(st->avg_frame_rate) /
3994  av_q2d(std_fps) - 1);
3995 
3996  if (error < best_error) {
3997  best_error = error;
3998  best_fps = std_fps.num;
3999  }
4000 
4001  if (ic->internal->prefer_codec_framerate && codec_frame_rate.num > 0 && codec_frame_rate.den > 0) {
4002  error = fabs(av_q2d(codec_frame_rate) /
4003  av_q2d(std_fps) - 1);
4004  if (error < best_error) {
4005  best_error = error;
4006  best_fps = std_fps.num;
4007  }
4008  }
4009  }
4010  if (best_fps)
4012  best_fps, 12 * 1001, INT_MAX);
4013  }
4014 
4015  if (!st->r_frame_rate.num) {
4016  if ( avctx->time_base.den * (int64_t) st->time_base.num
4017  <= avctx->time_base.num * avctx->ticks_per_frame * (int64_t) st->time_base.den) {
4019  avctx->time_base.den, (int64_t)avctx->time_base.num * avctx->ticks_per_frame, INT_MAX);
4020  } else {
4021  st->r_frame_rate.num = st->time_base.den;
4022  st->r_frame_rate.den = st->time_base.num;
4023  }
4024  }
4026  AVRational hw_ratio = { avctx->height, avctx->width };
4028  hw_ratio);
4029  }
4030  } else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
4031  if (!avctx->bits_per_coded_sample)
4032  avctx->bits_per_coded_sample =
4034  // set stream disposition based on audio service type
4035  switch (avctx->audio_service_type) {
4038  break;
4041  break;
4044  break;
4047  break;
4050  break;
4051  }
4052  }
4053  }
4054 
4055  if (probesize)
4056  estimate_timings(ic, old_offset);
4057 
4058  av_opt_set(ic, "skip_clear", "0", AV_OPT_SEARCH_CHILDREN);
4059 
4060  if (ret >= 0 && ic->nb_streams)
4061  /* We could not have all the codec parameters before EOF. */
4062  ret = -1;
4063  for (i = 0; i < ic->nb_streams; i++) {
4064  const char *errmsg;
4065  st = ic->streams[i];
4066 
4067  /* if no packet was ever seen, update context now for has_codec_parameters */
4068  if (!st->internal->avctx_inited) {
4069  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
4071  st->codecpar->format = st->internal->avctx->sample_fmt;
4073  if (ret < 0)
4074  goto find_stream_info_err;
4075  }
4076  if (!has_codec_parameters(st, &errmsg)) {
4077  char buf[256];
4078  avcodec_string(buf, sizeof(buf), st->internal->avctx, 0);
4079  av_log(ic, AV_LOG_WARNING,
4080  "Could not find codec parameters for stream %d (%s): %s\n"
4081  "Consider increasing the value for the 'analyzeduration' and 'probesize' options\n",
4082  i, buf, errmsg);
4083  } else {
4084  ret = 0;
4085  }
4086  }
4087 
4089 
4090  /* update the stream parameters from the internal codec contexts */
4091  for (i = 0; i < ic->nb_streams; i++) {
4092  st = ic->streams[i];
4093 
4094  if (st->internal->avctx_inited) {
4095  int orig_w = st->codecpar->width;
4096  int orig_h = st->codecpar->height;
4098  if (ret < 0)
4099  goto find_stream_info_err;
4100 #if FF_API_LOWRES
4101  // The decoder might reduce the video size by the lowres factor.
4102  if (st->internal->avctx->lowres && orig_w) {
4103  st->codecpar->width = orig_w;
4104  st->codecpar->height = orig_h;
4105  }
4106 #endif
4107  }
4108 
4109 #if FF_API_LAVF_AVCTX
4111  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
4112  if (ret < 0)
4113  goto find_stream_info_err;
4114 
4115 #if FF_API_LOWRES
4116  // The old API (AVStream.codec) "requires" the resolution to be adjusted
4117  // by the lowres factor.
4118  if (st->internal->avctx->lowres && st->internal->avctx->width) {
4119  st->codec->lowres = st->internal->avctx->lowres;
4120  st->codec->width = st->internal->avctx->width;
4121  st->codec->height = st->internal->avctx->height;
4122  }
4123 #endif
4124 
4125  if (st->codec->codec_tag != MKTAG('t','m','c','d')) {
4126  st->codec->time_base = st->internal->avctx->time_base;
4127  st->codec->ticks_per_frame = st->internal->avctx->ticks_per_frame;
4128  }
4129  st->codec->framerate = st->avg_frame_rate;
4130 
4131  if (st->internal->avctx->subtitle_header) {
4132  st->codec->subtitle_header = av_malloc(st->internal->avctx->subtitle_header_size);
4133  if (!st->codec->subtitle_header)
4134  goto find_stream_info_err;
4135  st->codec->subtitle_header_size = st->internal->avctx->subtitle_header_size;
4136  memcpy(st->codec->subtitle_header, st->internal->avctx->subtitle_header,
4137  st->codec->subtitle_header_size);
4138  }
4139 
4140  // Fields unavailable in AVCodecParameters
4141  st->codec->coded_width = st->internal->avctx->coded_width;
4142  st->codec->coded_height = st->internal->avctx->coded_height;
4143  st->codec->properties = st->internal->avctx->properties;
4145 #endif
4146 
4147  st->internal->avctx_inited = 0;
4148  }
4149 
4150 find_stream_info_err:
4151  for (i = 0; i < ic->nb_streams; i++) {
4152  st = ic->streams[i];
4153  if (st->info)
4154  av_freep(&st->info->duration_error);
4155  avcodec_close(ic->streams[i]->internal->avctx);
4156  av_freep(&ic->streams[i]->info);
4159  }
4160  if (ic->pb)
4161  av_log(ic, AV_LOG_DEBUG, "After avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d frames:%d\n",
4162  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, count);
4163  return ret;
4164 }
4165 
4167 {
4168  int i, j;
4169 
4170  for (i = 0; i < ic->nb_programs; i++) {
4171  if (ic->programs[i] == last) {
4172  last = NULL;
4173  } else {
4174  if (!last)
4175  for (j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
4176  if (ic->programs[i]->stream_index[j] == s)
4177  return ic->programs[i];
4178  }
4179  }
4180  return NULL;
4181 }
4182 
4184  int wanted_stream_nb, int related_stream,
4185  AVCodec **decoder_ret, int flags)
4186 {
4187  int i, nb_streams = ic->nb_streams;
4189  int best_count = -1, best_multiframe = -1, best_disposition = -1;
4190  int count, multiframe, disposition;
4191  int64_t best_bitrate = -1;
4192  int64_t bitrate;
4193  unsigned *program = NULL;
4194  const AVCodec *decoder = NULL, *best_decoder = NULL;
4195 
4196  if (related_stream >= 0 && wanted_stream_nb < 0) {
4197  AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
4198  if (p) {
4199  program = p->stream_index;
4200  nb_streams = p->nb_stream_indexes;
4201  }
4202  }
4203  for (i = 0; i < nb_streams; i++) {
4204  int real_stream_index = program ? program[i] : i;
4205  AVStream *st = ic->streams[real_stream_index];
4206  AVCodecParameters *par = st->codecpar;
4207  if (par->codec_type != type)
4208  continue;
4209  if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
4210  continue;
4211  if (type == AVMEDIA_TYPE_AUDIO && !(par->channels && par->sample_rate))
4212  continue;
4213  if (decoder_ret) {
4214  decoder = find_decoder(ic, st, par->codec_id);
4215  if (!decoder) {
4216  if (ret < 0)
4218  continue;
4219  }
4220  }
4222  count = st->codec_info_nb_frames;
4223  bitrate = par->bit_rate;
4224  multiframe = FFMIN(5, count);
4225  if ((best_disposition > disposition) ||
4226  (best_disposition == disposition && best_multiframe > multiframe) ||
4227  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate > bitrate) ||
4228  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
4229  continue;
4230  best_disposition = disposition;
4231  best_count = count;
4232  best_bitrate = bitrate;
4233  best_multiframe = multiframe;
4234  ret = real_stream_index;
4235  best_decoder = decoder;
4236  if (program && i == nb_streams - 1 && ret < 0) {
4237  program = NULL;
4238  nb_streams = ic->nb_streams;
4239  /* no related stream found, try again with everything */
4240  i = 0;
4241  }
4242  }
4243  if (decoder_ret)
4244  *decoder_ret = (AVCodec*)best_decoder;
4245  return ret;
4246 }
4247 
4248 /*******************************************************/
4249 
4251 {
4252  if (s->iformat->read_play)
4253  return s->iformat->read_play(s);
4254  if (s->pb)
4255  return avio_pause(s->pb, 0);
4256  return AVERROR(ENOSYS);
4257 }
4258 
4260 {
4261  if (s->iformat->read_pause)
4262  return s->iformat->read_pause(s);
4263  if (s->pb)
4264  return avio_pause(s->pb, 1);
4265  return AVERROR(ENOSYS);
4266 }
4267 
4269 {
4270  int ret, i;
4271 
4272  dst->id = src->id;
4273  dst->time_base = src->time_base;
4274  dst->nb_frames = src->nb_frames;
4275  dst->disposition = src->disposition;
4277  dst->avg_frame_rate = src->avg_frame_rate;
4278  dst->r_frame_rate = src->r_frame_rate;
4279 
4280  av_dict_free(&dst->metadata);
4281  ret = av_dict_copy(&dst->metadata, src->metadata, 0);
4282  if (ret < 0)
4283  return ret;
4284 
4285  ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
4286  if (ret < 0)
4287  return ret;
4288 
4289  /* Free existing side data*/
4290  for (i = 0; i < dst->nb_side_data; i++)
4291  av_free(dst->side_data[i].data);
4292  av_freep(&dst->side_data);
4293  dst->nb_side_data = 0;
4294 
4295  /* Copy side data if present */
4296  if (src->nb_side_data) {
4298  sizeof(AVPacketSideData));
4299  if (!dst->side_data)
4300  return AVERROR(ENOMEM);
4301  dst->nb_side_data = src->nb_side_data;
4302 
4303  for (i = 0; i < src->nb_side_data; i++) {
4304  uint8_t *data = av_memdup(src->side_data[i].data,
4305  src->side_data[i].size);
4306  if (!data)
4307  return AVERROR(ENOMEM);
4308  dst->side_data[i].type = src->side_data[i].type;
4309  dst->side_data[i].size = src->side_data[i].size;
4310  dst->side_data[i].data = data;
4311  }
4312  }
4313 
4314 #if FF_API_LAVF_FFSERVER
4316  av_freep(&dst->recommended_encoder_configuration);
4317  if (src->recommended_encoder_configuration) {
4318  const char *conf_str = src->recommended_encoder_configuration;
4319  dst->recommended_encoder_configuration = av_strdup(conf_str);
4320  if (!dst->recommended_encoder_configuration)
4321  return AVERROR(ENOMEM);
4322  }
4324 #endif
4325 
4326  return 0;
4327 }
4328 
4329 static void free_stream(AVStream **pst)
4330 {
4331  AVStream *st = *pst;
4332  int i;
4333 
4334  if (!st)
4335  return;
4336 
4337  for (i = 0; i < st->nb_side_data; i++)
4338  av_freep(&st->side_data[i].data);
4339  av_freep(&st->side_data);
4340 
4341  if (st->parser)
4342  av_parser_close(st->parser);
4343 
4344  if (st->attached_pic.data)
4346 
4347  if (st->internal) {
4349  for (i = 0; i < st->internal->nb_bsfcs; i++) {
4350  av_bsf_free(&st->internal->bsfcs[i]);
4351  av_freep(&st->internal->bsfcs);
4352  }
4353  av_freep(&st->internal->priv_pts);
4356  }
4357  av_freep(&st->internal);
4358 
4359  av_dict_free(&st->metadata);
4361  av_freep(&st->probe_data.buf);
4362  av_freep(&st->index_entries);
4363 #if FF_API_LAVF_AVCTX
4365  avcodec_free_context(&st->codec);
4367 #endif
4368  av_freep(&st->priv_data);
4369  if (st->info)
4370  av_freep(&st->info->duration_error);
4371  av_freep(&st->info);
4372 #if FF_API_LAVF_FFSERVER
4374  av_freep(&st->recommended_encoder_configuration);
4376 #endif
4377 
4378  av_freep(pst);
4379 }
4380 
4382 {
4383  av_assert0(s->nb_streams>0);
4384  av_assert0(s->streams[ s->nb_streams - 1 ] == st);
4385 
4386  free_stream(&s->streams[ --s->nb_streams ]);
4387 }
4388 
4390 {
4391  int i;
4392 
4393  if (!s)
4394  return;
4395 
4396  av_opt_free(s);
4397  if (s->iformat && s->iformat->priv_class && s->priv_data)
4398  av_opt_free(s->priv_data);
4399  if (s->oformat && s->oformat->priv_class && s->priv_data)
4400  av_opt_free(s->priv_data);
4401 
4402  for (i = s->nb_streams - 1; i >= 0; i--)
4403  ff_free_stream(s, s->streams[i]);
4404 
4405 
4406  for (i = s->nb_programs - 1; i >= 0; i--) {
4407  av_dict_free(&s->programs[i]->metadata);
4408  av_freep(&s->programs[i]->stream_index);
4409  av_freep(&s->programs[i]);
4410  }
4411  av_freep(&s->programs);
4412  av_freep(&s->priv_data);
4413  while (s->nb_chapters--) {
4415  av_freep(&s->chapters[s->nb_chapters]);
4416  }
4417  av_freep(&s->chapters);
4418  av_dict_free(&s->metadata);
4420  av_freep(&s->streams);
4421  flush_packet_queue(s);
4422  av_freep(&s->internal);
4423  av_freep(&s->url);
4424  av_free(s);
4425 }
4426 
4428 {
4429  AVFormatContext *s;
4430  AVIOContext *pb;
4431 
4432  if (!ps || !*ps)
4433  return;
4434 
4435  s = *ps;
4436  pb = s->pb;
4437 
4438  if ((s->iformat && strcmp(s->iformat->name, "image2") && s->iformat->flags & AVFMT_NOFILE) ||
4439  (s->flags & AVFMT_FLAG_CUSTOM_IO))
4440  pb = NULL;
4441 
4442  flush_packet_queue(s);
4443 
4444  if (s->iformat)
4445  if (s->iformat->read_close)
4446  s->iformat->read_close(s);
4447 
4449 
4450  *ps = NULL;
4451 
4452  avio_close(pb);
4453 }
4454 
4456 {
4457  AVStream *st;
4458  int i;
4459  AVStream **streams;
4460 
4461  if (s->nb_streams >= FFMIN(s->max_streams, INT_MAX/sizeof(*streams))) {
4462  if (s->max_streams < INT_MAX/sizeof(*streams))
4463  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);
4464  return NULL;
4465  }
4466  streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
4467  if (!streams)
4468  return NULL;
4469  s->streams = streams;
4470 
4471  st = av_mallocz(sizeof(AVStream));
4472  if (!st)
4473  return NULL;
4474  if (!(st->info = av_mallocz(sizeof(*st->info)))) {
4475  av_free(st);
4476  return NULL;
4477  }
4478  st->info->last_dts = AV_NOPTS_VALUE;
4479 
4480 #if FF_API_LAVF_AVCTX
4482  st->codec = avcodec_alloc_context3(c);
4483  if (!st->codec) {
4484  av_free(st->info);
4485  av_free(st);
4486  return NULL;
4487  }
4489 #endif
4490 
4491  st->internal = av_mallocz(sizeof(*st->internal));
4492  if (!st->internal)
4493  goto fail;
4494 
4496  if (!st->codecpar)
4497  goto fail;
4498 
4500  if (!st->internal->avctx)
4501  goto fail;
4502 
4503  if (s->iformat) {
4504 #if FF_API_LAVF_AVCTX
4506  /* no default bitrate if decoding */
4507  st->codec->bit_rate = 0;
4509 #endif
4510 
4511  /* default pts setting is MPEG-like */
4512  avpriv_set_pts_info(st, 33, 1, 90000);
4513  /* we set the current DTS to 0 so that formats without any timestamps
4514  * but durations get some timestamps, formats with some unknown
4515  * timestamps have their first few packets buffered and the
4516  * timestamps corrected before they are returned to the user */
4517  st->cur_dts = RELATIVE_TS_BASE;
4518  } else {
4519  st->cur_dts = AV_NOPTS_VALUE;
4520  }
4521 
4522  st->index = s->nb_streams;
4523  st->start_time = AV_NOPTS_VALUE;
4524  st->duration = AV_NOPTS_VALUE;
4525  st->first_dts = AV_NOPTS_VALUE;
4529 
4532  for (i = 0; i < MAX_REORDER_DELAY + 1; i++)
4533  st->pts_buffer[i] = AV_NOPTS_VALUE;
4534 
4535  st->sample_aspect_ratio = (AVRational) { 0, 1 };
4536 
4537 #if FF_API_R_FRAME_RATE
4538  st->info->last_dts = AV_NOPTS_VALUE;
4539 #endif
4542 
4544 
4545  st->internal->need_context_update = 1;
4546 
4547  s->streams[s->nb_streams++] = st;
4548  return st;
4549 fail:
4550  free_stream(&st);
4551  return NULL;
4552 }
4553 
4555 {
4556  AVProgram *program = NULL;
4557  int i;
4558 
4559  av_log(ac, AV_LOG_TRACE, "new_program: id=0x%04x\n", id);
4560 
4561  for (i = 0; i < ac->nb_programs; i++)
4562  if (ac->programs[i]->id == id)
4563  program = ac->programs[i];
4564 
4565  if (!program) {
4566  program = av_mallocz(sizeof(AVProgram));
4567  if (!program)
4568  return NULL;
4569  dynarray_add(&ac->programs, &ac->nb_programs, program);
4570  program->discard = AVDISCARD_NONE;
4571  program->pmt_version = -1;
4572  }
4573  program->id = id;
4576 
4577  program->start_time =
4578  program->end_time = AV_NOPTS_VALUE;
4579 
4580  return program;
4581 }
4582