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  int orig_size = pkt->size;
272  int ret;
273 
274  do {
275  int prev_size = pkt->size;
276  int read_size;
277 
278  /* When the caller requests a lot of data, limit it to the amount
279  * left in file or SANE_CHUNK_SIZE when it is not known. */
280  read_size = size;
281  if (read_size > SANE_CHUNK_SIZE/10) {
282  read_size = ffio_limit(s, read_size);
283  // If filesize/maxsize is unknown, limit to SANE_CHUNK_SIZE
284  if (s->maxsize < 0)
285  read_size = FFMIN(read_size, SANE_CHUNK_SIZE);
286  }
287 
288  ret = av_grow_packet(pkt, read_size);
289  if (ret < 0)
290  break;
291 
292  ret = avio_read(s, pkt->data + prev_size, read_size);
293  if (ret != read_size) {
294  av_shrink_packet(pkt, prev_size + FFMAX(ret, 0));
295  break;
296  }
297 
298  size -= read_size;
299  } while (size > 0);
300  if (size > 0)
301  pkt->flags |= AV_PKT_FLAG_CORRUPT;
302 
303  if (!pkt->size)
304  av_packet_unref(pkt);
305  return pkt->size > orig_size ? pkt->size - orig_size : ret;
306 }
307 
309 {
310  av_init_packet(pkt);
311  pkt->data = NULL;
312  pkt->size = 0;
313  pkt->pos = avio_tell(s);
314 
315  return append_packet_chunked(s, pkt, size);
316 }
317 
319 {
320  if (!pkt->size)
321  return av_get_packet(s, pkt, size);
322  return append_packet_chunked(s, pkt, size);
323 }
324 
325 int av_filename_number_test(const char *filename)
326 {
327  char buf[1024];
328  return filename &&
329  (av_get_frame_filename(buf, sizeof(buf), filename, 1) >= 0);
330 }
331 
333  AVProbeData *pd)
334 {
335  static const struct {
336  const char *name;
337  enum AVCodecID id;
338  enum AVMediaType type;
339  } fmt_id_type[] = {
341  { "ac3", AV_CODEC_ID_AC3, AVMEDIA_TYPE_AUDIO },
342  { "aptx", AV_CODEC_ID_APTX, AVMEDIA_TYPE_AUDIO },
343  { "dts", AV_CODEC_ID_DTS, AVMEDIA_TYPE_AUDIO },
345  { "dvbtxt", AV_CODEC_ID_DVB_TELETEXT,AVMEDIA_TYPE_SUBTITLE },
346  { "eac3", AV_CODEC_ID_EAC3, AVMEDIA_TYPE_AUDIO },
348  { "hevc", AV_CODEC_ID_HEVC, AVMEDIA_TYPE_VIDEO },
349  { "loas", AV_CODEC_ID_AAC_LATM, AVMEDIA_TYPE_AUDIO },
350  { "m4v", AV_CODEC_ID_MPEG4, AVMEDIA_TYPE_VIDEO },
351  { "mjpeg_2000",AV_CODEC_ID_JPEG2000, AVMEDIA_TYPE_VIDEO },
352  { "mp3", AV_CODEC_ID_MP3, AVMEDIA_TYPE_AUDIO },
353  { "mpegvideo", AV_CODEC_ID_MPEG2VIDEO, AVMEDIA_TYPE_VIDEO },
354  { "truehd", AV_CODEC_ID_TRUEHD, AVMEDIA_TYPE_AUDIO },
355  { 0 }
356  };
357  int score;
358  const AVInputFormat *fmt = av_probe_input_format3(pd, 1, &score);
359 
360  if (fmt) {
361  int i;
362  av_log(s, AV_LOG_DEBUG,
363  "Probe with size=%d, packets=%d detected %s with score=%d\n",
365  fmt->name, score);
366  for (i = 0; fmt_id_type[i].name; i++) {
367  if (!strcmp(fmt->name, fmt_id_type[i].name)) {
368  if (fmt_id_type[i].type != AVMEDIA_TYPE_AUDIO &&
369  st->codecpar->sample_rate)
370  continue;
371  if (st->request_probe > score &&
372  st->codecpar->codec_id != fmt_id_type[i].id)
373  continue;
374  st->codecpar->codec_id = fmt_id_type[i].id;
375  st->codecpar->codec_type = fmt_id_type[i].type;
376  st->internal->need_context_update = 1;
377 #if FF_API_LAVF_AVCTX
379  st->codec->codec_type = st->codecpar->codec_type;
380  st->codec->codec_id = st->codecpar->codec_id;
382 #endif
383  return score;
384  }
385  }
386  }
387  return 0;
388 }
389 
390 /************************************************************/
391 /* input media file */
392 
394  int err;
395 
396  if (ic->format_whitelist && av_match_list(ic->iformat->name, ic->format_whitelist, ',') <= 0) {
397  av_log(ic, AV_LOG_ERROR, "Format not on whitelist \'%s\'\n", ic->format_whitelist);
398  return AVERROR(EINVAL);
399  }
400 
401  if (ic->iformat->read_header) {
402  err = ic->iformat->read_header(ic);
403  if (err < 0)
404  return err;
405  }
406 
407  if (ic->pb && !ic->internal->data_offset)
408  ic->internal->data_offset = avio_tell(ic->pb);
409 
410  return 0;
411 }
412 
413 /* Open input file and probe the format if necessary. */
414 static int init_input(AVFormatContext *s, const char *filename,
416 {
417  int ret;
418  AVProbeData pd = { filename, NULL, 0 };
419  int score = AVPROBE_SCORE_RETRY;
420 
421  if (s->pb) {
423  if (!s->iformat)
424  return av_probe_input_buffer2(s->pb, &s->iformat, filename,
425  s, 0, s->format_probesize);
426  else if (s->iformat->flags & AVFMT_NOFILE)
427  av_log(s, AV_LOG_WARNING, "Custom AVIOContext makes no sense and "
428  "will be ignored with AVFMT_NOFILE format.\n");
429  return 0;
430  }
431 
432  if ((s->iformat && s->iformat->flags & AVFMT_NOFILE) ||
433  (!s->iformat && (s->iformat = av_probe_input_format2(&pd, 0, &score))))
434  return score;
435 
436  if ((ret = s->io_open(s, &s->pb, filename, AVIO_FLAG_READ | s->avio_flags, options)) < 0)
437  return ret;
438 
439  if (s->iformat)
440  return 0;
441  return av_probe_input_buffer2(s->pb, &s->iformat, filename,
442  s, 0, s->format_probesize);
443 }
444 
445 int ff_packet_list_put(AVPacketList **packet_buffer,
446  AVPacketList **plast_pktl,
447  AVPacket *pkt, int flags)
448 {
449  AVPacketList *pktl = av_mallocz(sizeof(AVPacketList));
450  int ret;
451 
452  if (!pktl)
453  return AVERROR(ENOMEM);
454 
455  if (flags & FF_PACKETLIST_FLAG_REF_PACKET) {
456  if ((ret = av_packet_ref(&pktl->pkt, pkt)) < 0) {
457  av_free(pktl);
458  return ret;
459  }
460  } else {
461  ret = av_packet_make_refcounted(pkt);
462  if (ret < 0) {
463  av_free(pktl);
464  return ret;
465  }
466  av_packet_move_ref(&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  av_log(s, AV_LOG_WARNING, "Discarding ID3 tags because more suitable tags were found.\n");
640  }
641 
642  if (id3v2_extra_meta) {
643  if (!strcmp(s->iformat->name, "mp3") || !strcmp(s->iformat->name, "aac") ||
644  !strcmp(s->iformat->name, "tta") || !strcmp(s->iformat->name, "wav")) {
645  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0)
646  goto close;
647  if ((ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0)
648  goto close;
649  if ((ret = ff_id3v2_parse_priv(s, &id3v2_extra_meta)) < 0)
650  goto close;
651  } else
652  av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
653  }
654  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
655 
656  if ((ret = avformat_queue_attached_pictures(s)) < 0)
657  goto close;
658 
659  if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->pb && !s->internal->data_offset)
660  s->internal->data_offset = avio_tell(s->pb);
661 
663 
665 
666  for (i = 0; i < s->nb_streams; i++)
668 
669  if (options) {
670  av_dict_free(options);
671  *options = tmp;
672  }
673  *ps = s;
674  return 0;
675 
676 close:
677  if (s->iformat->read_close)
678  s->iformat->read_close(s);
679 fail:
680  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
681  av_dict_free(&tmp);
682  if (s->pb && !(s->flags & AVFMT_FLAG_CUSTOM_IO))
683  avio_closep(&s->pb);
685  *ps = NULL;
686  return ret;
687 }
688 
689 /*******************************************************/
690 
692 {
693  switch (st->codecpar->codec_type) {
694  case AVMEDIA_TYPE_VIDEO:
695  if (s->video_codec_id)
696  st->codecpar->codec_id = s->video_codec_id;
697  break;
698  case AVMEDIA_TYPE_AUDIO:
699  if (s->audio_codec_id)
700  st->codecpar->codec_id = s->audio_codec_id;
701  break;
703  if (s->subtitle_codec_id)
705  break;
706  case AVMEDIA_TYPE_DATA:
707  if (s->data_codec_id)
708  st->codecpar->codec_id = s->data_codec_id;
709  break;
710  }
711 }
712 
713 static int probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
714 {
715  if (st->request_probe>0) {
716  AVProbeData *pd = &st->probe_data;
717  int end;
718  av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
719  --st->probe_packets;
720 
721  if (pkt) {
722  uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
723  if (!new_buf) {
725  "Failed to reallocate probe buffer for stream %d\n",
726  st->index);
727  goto no_packet;
728  }
729  pd->buf = new_buf;
730  memcpy(pd->buf + pd->buf_size, pkt->data, pkt->size);
731  pd->buf_size += pkt->size;
732  memset(pd->buf + pd->buf_size, 0, AVPROBE_PADDING_SIZE);
733  } else {
734 no_packet:
735  st->probe_packets = 0;
736  if (!pd->buf_size) {
738  "nothing to probe for stream %d\n", st->index);
739  }
740  }
741 
743  || st->probe_packets<= 0;
744 
745  if (end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)) {
746  int score = set_codec_from_probe_data(s, st, pd);
748  || end) {
749  pd->buf_size = 0;
750  av_freep(&pd->buf);
751  st->request_probe = -1;
752  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
753  av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
754  } else
755  av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
756  }
757  force_codec_ids(s, st);
758  }
759  }
760  return 0;
761 }
762 
763 static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
764 {
765  int64_t ref = pkt->dts;
766  int i, pts_wrap_behavior;
767  int64_t pts_wrap_reference;
768  AVProgram *first_program;
769 
770  if (ref == AV_NOPTS_VALUE)
771  ref = pkt->pts;
772  if (st->pts_wrap_reference != AV_NOPTS_VALUE || st->pts_wrap_bits >= 63 || ref == AV_NOPTS_VALUE || !s->correct_ts_overflow)
773  return 0;
774  ref &= (1LL << st->pts_wrap_bits)-1;
775 
776  // reference time stamp should be 60 s before first time stamp
777  pts_wrap_reference = ref - av_rescale(60, st->time_base.den, st->time_base.num);
778  // if first time stamp is not more than 1/8 and 60s before the wrap point, subtract rather than add wrap offset
779  pts_wrap_behavior = (ref < (1LL << st->pts_wrap_bits) - (1LL << st->pts_wrap_bits-3)) ||
780  (ref < (1LL << st->pts_wrap_bits) - av_rescale(60, st->time_base.den, st->time_base.num)) ?
782 
783  first_program = av_find_program_from_stream(s, NULL, stream_index);
784 
785  if (!first_program) {
786  int default_stream_index = av_find_default_stream_index(s);
787  if (s->streams[default_stream_index]->pts_wrap_reference == AV_NOPTS_VALUE) {
788  for (i = 0; i < s->nb_streams; i++) {
790  continue;
791  s->streams[i]->pts_wrap_reference = pts_wrap_reference;
792  s->streams[i]->pts_wrap_behavior = pts_wrap_behavior;
793  }
794  }
795  else {
796  st->pts_wrap_reference = s->streams[default_stream_index]->pts_wrap_reference;
797  st->pts_wrap_behavior = s->streams[default_stream_index]->pts_wrap_behavior;
798  }
799  }
800  else {
801  AVProgram *program = first_program;
802  while (program) {
803  if (program->pts_wrap_reference != AV_NOPTS_VALUE) {
804  pts_wrap_reference = program->pts_wrap_reference;
805  pts_wrap_behavior = program->pts_wrap_behavior;
806  break;
807  }
808  program = av_find_program_from_stream(s, program, stream_index);
809  }
810 
811  // update every program with differing pts_wrap_reference
812  program = first_program;
813  while (program) {
814  if (program->pts_wrap_reference != pts_wrap_reference) {
815  for (i = 0; i<program->nb_stream_indexes; i++) {
816  s->streams[program->stream_index[i]]->pts_wrap_reference = pts_wrap_reference;
817  s->streams[program->stream_index[i]]->pts_wrap_behavior = pts_wrap_behavior;
818  }
819 
820  program->pts_wrap_reference = pts_wrap_reference;
821  program->pts_wrap_behavior = pts_wrap_behavior;
822  }
823  program = av_find_program_from_stream(s, program, stream_index);
824  }
825  }
826  return 1;
827 }
828 
830 {
831  int ret, i, err;
832  AVStream *st;
833 
834  pkt->data = NULL;
835  pkt->size = 0;
836  av_init_packet(pkt);
837 
838  for (;;) {
840  const AVPacket *pkt1;
841 
842  if (pktl) {
843  st = s->streams[pktl->pkt.stream_index];
845  if ((err = probe_codec(s, st, NULL)) < 0)
846  return err;
847  if (st->request_probe <= 0) {
849  &s->internal->raw_packet_buffer_end, pkt);
851  return 0;
852  }
853  }
854 
855  ret = s->iformat->read_packet(s, pkt);
856  if (ret < 0) {
857  av_packet_unref(pkt);
858 
859  /* Some demuxers return FFERROR_REDO when they consume
860  data and discard it (ignored streams, junk, extradata).
861  We must re-call the demuxer to get the real packet. */
862  if (ret == FFERROR_REDO)
863  continue;
864  if (!pktl || ret == AVERROR(EAGAIN))
865  return ret;
866  for (i = 0; i < s->nb_streams; i++) {
867  st = s->streams[i];
868  if (st->probe_packets || st->request_probe > 0)
869  if ((err = probe_codec(s, st, NULL)) < 0)
870  return err;
871  av_assert0(st->request_probe <= 0);
872  }
873  continue;
874  }
875 
876  err = av_packet_make_refcounted(pkt);
877  if (err < 0) {
878  av_packet_unref(pkt);
879  return err;
880  }
881 
882  if (pkt->flags & AV_PKT_FLAG_CORRUPT) {
884  "Packet corrupt (stream = %d, dts = %s)",
885  pkt->stream_index, av_ts2str(pkt->dts));
887  av_log(s, AV_LOG_WARNING, ", dropping it.\n");
888  av_packet_unref(pkt);
889  continue;
890  }
891  av_log(s, AV_LOG_WARNING, ".\n");
892  }
893 
894  av_assert0(pkt->stream_index < (unsigned)s->nb_streams &&
895  "Invalid stream index.\n");
896 
897  st = s->streams[pkt->stream_index];
898 
900  // correct first time stamps to negative values
901  if (!is_relative(st->first_dts))
902  st->first_dts = wrap_timestamp(st, st->first_dts);
903  if (!is_relative(st->start_time))
904  st->start_time = wrap_timestamp(st, st->start_time);
905  if (!is_relative(st->cur_dts))
906  st->cur_dts = wrap_timestamp(st, st->cur_dts);
907  }
908 
909  pkt->dts = wrap_timestamp(st, pkt->dts);
910  pkt->pts = wrap_timestamp(st, pkt->pts);
911 
912  force_codec_ids(s, st);
913 
914  /* TODO: audio: time filter; video: frame reordering (pts != dts) */
916  pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
917 
918  if (!pktl && st->request_probe <= 0)
919  return ret;
920 
923  pkt, 0);
924  if (err < 0) {
925  av_packet_unref(pkt);
926  return err;
927  }
928  pkt1 = &s->internal->raw_packet_buffer_end->pkt;
930 
931  if ((err = probe_codec(s, st, pkt1)) < 0)
932  return err;
933  }
934 }
935 
936 
937 /**********************************************************/
938 
940 {
941  switch(avctx->codec_id) {
942  case AV_CODEC_ID_MP1:
943  case AV_CODEC_ID_MP2:
944  case AV_CODEC_ID_MP3:
945  case AV_CODEC_ID_CODEC2:
946  return 1;
947  }
948 
949  return 0;
950 }
951 
952 /**
953  * Return the frame duration in seconds. Return 0 if not available.
954  */
955 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
957 {
958  AVRational codec_framerate = s->iformat ? st->internal->avctx->framerate :
959  av_mul_q(av_inv_q(st->internal->avctx->time_base), (AVRational){1, st->internal->avctx->ticks_per_frame});
960  int frame_size, sample_rate;
961 
962 #if FF_API_LAVF_AVCTX
964  if ((!codec_framerate.den || !codec_framerate.num) && st->codec->time_base.den && st->codec->time_base.num)
965  codec_framerate = av_mul_q(av_inv_q(st->codec->time_base), (AVRational){1, st->codec->ticks_per_frame});
967 #endif
968 
969  *pnum = 0;
970  *pden = 0;
971  switch (st->codecpar->codec_type) {
972  case AVMEDIA_TYPE_VIDEO:
973  if (st->r_frame_rate.num && !pc && s->iformat) {
974  *pnum = st->r_frame_rate.den;
975  *pden = st->r_frame_rate.num;
976  } else if (st->time_base.num * 1000LL > st->time_base.den) {
977  *pnum = st->time_base.num;
978  *pden = st->time_base.den;
979  } else if (codec_framerate.den * 1000LL > codec_framerate.num) {
981  av_reduce(pnum, pden,
982  codec_framerate.den,
983  codec_framerate.num * (int64_t)st->internal->avctx->ticks_per_frame,
984  INT_MAX);
985 
986  if (pc && pc->repeat_pict) {
987  av_assert0(s->iformat); // this may be wrong for interlaced encoding but its not used for that case
988  av_reduce(pnum, pden,
989  (*pnum) * (1LL + pc->repeat_pict),
990  (*pden),
991  INT_MAX);
992  }
993  /* If this codec can be interlaced or progressive then we need
994  * a parser to compute duration of a packet. Thus if we have
995  * no parser in such case leave duration undefined. */
996  if (st->internal->avctx->ticks_per_frame > 1 && !pc)
997  *pnum = *pden = 0;
998  }
999  break;
1000  case AVMEDIA_TYPE_AUDIO:
1001  if (st->internal->avctx_inited) {
1002  frame_size = av_get_audio_frame_duration(st->internal->avctx, pkt->size);
1003  sample_rate = st->internal->avctx->sample_rate;
1004  } else {
1005  frame_size = av_get_audio_frame_duration2(st->codecpar, pkt->size);
1006  sample_rate = st->codecpar->sample_rate;
1007  }
1008  if (frame_size <= 0 || sample_rate <= 0)
1009  break;
1010  *pnum = frame_size;
1011  *pden = sample_rate;
1012  break;
1013  default:
1014  break;
1015  }
1016 }
1017 
1018 static int is_intra_only(enum AVCodecID id)
1019 {
1021  if (!d)
1022  return 0;
1023  if ((d->type == AVMEDIA_TYPE_VIDEO || d->type == AVMEDIA_TYPE_AUDIO) &&
1025  return 0;
1026  return 1;
1027 }
1028 
1030 {
1031  if (st->codecpar->codec_id != AV_CODEC_ID_H264) return 1;
1032  if (!st->info) // if we have left find_stream_info then nb_decoded_frames won't increase anymore for stream copy
1033  return 1;
1034 #if CONFIG_H264_DECODER
1035  if (st->internal->avctx->has_b_frames &&
1037  return 1;
1038 #endif
1039  if (st->internal->avctx->has_b_frames<3)
1040  return st->nb_decoded_frames >= 7;
1041  else if (st->internal->avctx->has_b_frames<4)
1042  return st->nb_decoded_frames >= 18;
1043  else
1044  return st->nb_decoded_frames >= 20;
1045 }
1046 
1048 {
1049  if (pktl->next)
1050  return pktl->next;
1051  if (pktl == s->internal->packet_buffer_end)
1052  return s->internal->parse_queue;
1053  return NULL;
1054 }
1055 
1056 static int64_t select_from_pts_buffer(AVStream *st, int64_t *pts_buffer, int64_t dts) {
1057  int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
1059 
1060  if(!onein_oneout) {
1061  int delay = st->internal->avctx->has_b_frames;
1062  int i;
1063 
1064  if (dts == AV_NOPTS_VALUE) {
1065  int64_t best_score = INT64_MAX;
1066  for (i = 0; i<delay; i++) {
1067  if (st->pts_reorder_error_count[i]) {
1068  int64_t score = st->pts_reorder_error[i] / st->pts_reorder_error_count[i];
1069  if (score < best_score) {
1070  best_score = score;
1071  dts = pts_buffer[i];
1072  }
1073  }
1074  }
1075  } else {
1076  for (i = 0; i<delay; i++) {
1077  if (pts_buffer[i] != AV_NOPTS_VALUE) {
1078  int64_t diff = FFABS(pts_buffer[i] - dts)
1079  + (uint64_t)st->pts_reorder_error[i];
1080  diff = FFMAX(diff, st->pts_reorder_error[i]);
1081  st->pts_reorder_error[i] = diff;
1082  st->pts_reorder_error_count[i]++;
1083  if (st->pts_reorder_error_count[i] > 250) {
1084  st->pts_reorder_error[i] >>= 1;
1085  st->pts_reorder_error_count[i] >>= 1;
1086  }
1087  }
1088  }
1089  }
1090  }
1091 
1092  if (dts == AV_NOPTS_VALUE)
1093  dts = pts_buffer[0];
1094 
1095  return dts;
1096 }
1097 
1098 /**
1099  * Updates the dts of packets of a stream in pkt_buffer, by re-ordering the pts
1100  * of the packets in a window.
1101  */
1102 static void update_dts_from_pts(AVFormatContext *s, int stream_index,
1103  AVPacketList *pkt_buffer)
1104 {
1105  AVStream *st = s->streams[stream_index];
1106  int delay = st->internal->avctx->has_b_frames;
1107  int i;
1108 
1109  int64_t pts_buffer[MAX_REORDER_DELAY+1];
1110 
1111  for (i = 0; i<MAX_REORDER_DELAY+1; i++)
1112  pts_buffer[i] = AV_NOPTS_VALUE;
1113 
1114  for (; pkt_buffer; pkt_buffer = get_next_pkt(s, st, pkt_buffer)) {
1115  if (pkt_buffer->pkt.stream_index != stream_index)
1116  continue;
1117 
1118  if (pkt_buffer->pkt.pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
1119  pts_buffer[0] = pkt_buffer->pkt.pts;
1120  for (i = 0; i<delay && pts_buffer[i] > pts_buffer[i + 1]; i++)
1121  FFSWAP(int64_t, pts_buffer[i], pts_buffer[i + 1]);
1122 
1123  pkt_buffer->pkt.dts = select_from_pts_buffer(st, pts_buffer, pkt_buffer->pkt.dts);
1124  }
1125  }
1126 }
1127 
1128 static void update_initial_timestamps(AVFormatContext *s, int stream_index,
1129  int64_t dts, int64_t pts, AVPacket *pkt)
1130 {
1131  AVStream *st = s->streams[stream_index];
1133  AVPacketList *pktl_it;
1134 
1135  uint64_t shift;
1136 
1137  if (st->first_dts != AV_NOPTS_VALUE ||
1138  dts == AV_NOPTS_VALUE ||
1139  st->cur_dts == AV_NOPTS_VALUE ||
1140  st->cur_dts < INT_MIN + RELATIVE_TS_BASE ||
1141  is_relative(dts))
1142  return;
1143 
1144  st->first_dts = dts - (st->cur_dts - RELATIVE_TS_BASE);
1145  st->cur_dts = dts;
1146  shift = (uint64_t)st->first_dts - RELATIVE_TS_BASE;
1147 
1148  if (is_relative(pts))
1149  pts += shift;
1150 
1151  for (pktl_it = pktl; pktl_it; pktl_it = get_next_pkt(s, st, pktl_it)) {
1152  if (pktl_it->pkt.stream_index != stream_index)
1153  continue;
1154  if (is_relative(pktl_it->pkt.pts))
1155  pktl_it->pkt.pts += shift;
1156 
1157  if (is_relative(pktl_it->pkt.dts))
1158  pktl_it->pkt.dts += shift;
1159 
1160  if (st->start_time == AV_NOPTS_VALUE && pktl_it->pkt.pts != AV_NOPTS_VALUE) {
1161  st->start_time = pktl_it->pkt.pts;
1163  st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
1164  }
1165  }
1166 
1168  update_dts_from_pts(s, stream_index, pktl);
1169  }
1170 
1171  if (st->start_time == AV_NOPTS_VALUE) {
1172  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || !(pkt->flags & AV_PKT_FLAG_DISCARD)) {
1173  st->start_time = pts;
1174  }
1176  st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
1177  }
1178 }
1179 
1181  int stream_index, int duration)
1182 {
1184  int64_t cur_dts = RELATIVE_TS_BASE;
1185 
1186  if (st->first_dts != AV_NOPTS_VALUE) {
1188  return;
1190  cur_dts = st->first_dts;
1191  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
1192  if (pktl->pkt.stream_index == stream_index) {
1193  if (pktl->pkt.pts != pktl->pkt.dts ||
1194  pktl->pkt.dts != AV_NOPTS_VALUE ||
1195  pktl->pkt.duration)
1196  break;
1197  cur_dts -= duration;
1198  }
1199  }
1200  if (pktl && pktl->pkt.dts != st->first_dts) {
1201  av_log(s, AV_LOG_DEBUG, "first_dts %s not matching first dts %s (pts %s, duration %"PRId64") in the queue\n",
1202  av_ts2str(st->first_dts), av_ts2str(pktl->pkt.dts), av_ts2str(pktl->pkt.pts), pktl->pkt.duration);
1203  return;
1204  }
1205  if (!pktl) {
1206  av_log(s, AV_LOG_DEBUG, "first_dts %s but no packet with dts in the queue\n", av_ts2str(st->first_dts));
1207  return;
1208  }
1210  st->first_dts = cur_dts;
1211  } else if (st->cur_dts != RELATIVE_TS_BASE)
1212  return;
1213 
1214  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
1215  if (pktl->pkt.stream_index != stream_index)
1216  continue;
1217  if ((pktl->pkt.pts == pktl->pkt.dts ||
1218  pktl->pkt.pts == AV_NOPTS_VALUE) &&
1219  (pktl->pkt.dts == AV_NOPTS_VALUE ||
1220  pktl->pkt.dts == st->first_dts ||
1221  pktl->pkt.dts == RELATIVE_TS_BASE) &&
1222  !pktl->pkt.duration) {
1223  pktl->pkt.dts = cur_dts;
1224  if (!st->internal->avctx->has_b_frames)
1225  pktl->pkt.pts = cur_dts;
1226 // if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1227  pktl->pkt.duration = duration;
1228  } else
1229  break;
1230  cur_dts = pktl->pkt.dts + pktl->pkt.duration;
1231  }
1232  if (!pktl)
1233  st->cur_dts = cur_dts;
1234 }
1235 
1238  int64_t next_dts, int64_t next_pts)
1239 {
1240  int num, den, presentation_delayed, delay, i;
1241  int64_t offset;
1243  int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
1245 
1246  if (s->flags & AVFMT_FLAG_NOFILLIN)
1247  return;
1248 
1249  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && pkt->dts != AV_NOPTS_VALUE) {
1250  if (pkt->dts == pkt->pts && st->last_dts_for_order_check != AV_NOPTS_VALUE) {
1251  if (st->last_dts_for_order_check <= pkt->dts) {
1252  st->dts_ordered++;
1253  } else {
1255  "DTS %"PRIi64" < %"PRIi64" out of order\n",
1256  pkt->dts,
1258  st->dts_misordered++;
1259  }
1260  if (st->dts_ordered + st->dts_misordered > 250) {
1261  st->dts_ordered >>= 1;
1262  st->dts_misordered >>= 1;
1263  }
1264  }
1265 
1266  st->last_dts_for_order_check = pkt->dts;
1267  if (st->dts_ordered < 8*st->dts_misordered && pkt->dts == pkt->pts)
1268  pkt->dts = AV_NOPTS_VALUE;
1269  }
1270 
1271  if ((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
1272  pkt->dts = AV_NOPTS_VALUE;
1273 
1274  if (pc && pc->pict_type == AV_PICTURE_TYPE_B
1275  && !st->internal->avctx->has_b_frames)
1276  //FIXME Set low_delay = 0 when has_b_frames = 1
1277  st->internal->avctx->has_b_frames = 1;
1278 
1279  /* do we have a video B-frame ? */
1280  delay = st->internal->avctx->has_b_frames;
1281  presentation_delayed = 0;
1282 
1283  /* XXX: need has_b_frame, but cannot get it if the codec is
1284  * not initialized */
1285  if (delay &&
1286  pc && pc->pict_type != AV_PICTURE_TYPE_B)
1287  presentation_delayed = 1;
1288 
1289  if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
1290  st->pts_wrap_bits < 63 &&
1291  pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
1292  if (is_relative(st->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > st->cur_dts) {
1293  pkt->dts -= 1LL << st->pts_wrap_bits;
1294  } else
1295  pkt->pts += 1LL << st->pts_wrap_bits;
1296  }
1297 
1298  /* Some MPEG-2 in MPEG-PS lack dts (issue #171 / input_file.mpg).
1299  * We take the conservative approach and discard both.
1300  * Note: If this is misbehaving for an H.264 file, then possibly
1301  * presentation_delayed is not set correctly. */
1302  if (delay == 1 && pkt->dts == pkt->pts &&
1303  pkt->dts != AV_NOPTS_VALUE && presentation_delayed) {
1304  av_log(s, AV_LOG_DEBUG, "invalid dts/pts combination %"PRIi64"\n", pkt->dts);
1305  if ( strcmp(s->iformat->name, "mov,mp4,m4a,3gp,3g2,mj2")
1306  && strcmp(s->iformat->name, "flv")) // otherwise we discard correct timestamps for vc1-wmapro.ism
1307  pkt->dts = AV_NOPTS_VALUE;
1308  }
1309 
1310  duration = av_mul_q((AVRational) {pkt->duration, 1}, st->time_base);
1311  if (pkt->duration <= 0) {
1312  ff_compute_frame_duration(s, &num, &den, st, pc, pkt);
1313  if (den && num) {
1314  duration = (AVRational) {num, den};
1315  pkt->duration = av_rescale_rnd(1,
1316  num * (int64_t) st->time_base.den,
1317  den * (int64_t) st->time_base.num,
1318  AV_ROUND_DOWN);
1319  }
1320  }
1321 
1322  if (pkt->duration > 0 && (s->internal->packet_buffer || s->internal->parse_queue))
1323  update_initial_durations(s, st, pkt->stream_index, pkt->duration);
1324 
1325  /* Correct timestamps with byte offset if demuxers only have timestamps
1326  * on packet boundaries */
1327  if (pc && st->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size) {
1328  /* this will estimate bitrate based on this frame's duration and size */
1329  offset = av_rescale(pc->offset, pkt->duration, pkt->size);
1330  if (pkt->pts != AV_NOPTS_VALUE)
1331  pkt->pts += offset;
1332  if (pkt->dts != AV_NOPTS_VALUE)
1333  pkt->dts += offset;
1334  }
1335 
1336  /* This may be redundant, but it should not hurt. */
1337  if (pkt->dts != AV_NOPTS_VALUE &&
1338  pkt->pts != AV_NOPTS_VALUE &&
1339  pkt->pts > pkt->dts)
1340  presentation_delayed = 1;
1341 
1342  if (s->debug & FF_FDEBUG_TS)
1343  av_log(s, AV_LOG_DEBUG,
1344  "IN delayed:%d pts:%s, dts:%s cur_dts:%s st:%d pc:%p duration:%"PRId64" delay:%d onein_oneout:%d\n",
1345  presentation_delayed, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts),
1346  pkt->stream_index, pc, pkt->duration, delay, onein_oneout);
1347 
1348  /* Interpolate PTS and DTS if they are not present. We skip H264
1349  * currently because delay and has_b_frames are not reliably set. */
1350  if ((delay == 0 || (delay == 1 && pc)) &&
1351  onein_oneout) {
1352  if (presentation_delayed) {
1353  /* DTS = decompression timestamp */
1354  /* PTS = presentation timestamp */
1355  if (pkt->dts == AV_NOPTS_VALUE)
1356  pkt->dts = st->last_IP_pts;
1357  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1358  if (pkt->dts == AV_NOPTS_VALUE)
1359  pkt->dts = st->cur_dts;
1360 
1361  /* This is tricky: the dts must be incremented by the duration
1362  * of the frame we are displaying, i.e. the last I- or P-frame. */
1363  if (st->last_IP_duration == 0 && (uint64_t)pkt->duration <= INT32_MAX)
1364  st->last_IP_duration = pkt->duration;
1365  if (pkt->dts != AV_NOPTS_VALUE)
1366  st->cur_dts = pkt->dts + st->last_IP_duration;
1367  if (pkt->dts != AV_NOPTS_VALUE &&
1368  pkt->pts == AV_NOPTS_VALUE &&
1369  st->last_IP_duration > 0 &&
1370  ((uint64_t)st->cur_dts - (uint64_t)next_dts + 1) <= 2 &&
1371  next_dts != next_pts &&
1372  next_pts != AV_NOPTS_VALUE)
1373  pkt->pts = next_dts;
1374 
1375  if ((uint64_t)pkt->duration <= INT32_MAX)
1376  st->last_IP_duration = pkt->duration;
1377  st->last_IP_pts = pkt->pts;
1378  /* Cannot compute PTS if not present (we can compute it only
1379  * by knowing the future. */
1380  } else if (pkt->pts != AV_NOPTS_VALUE ||
1381  pkt->dts != AV_NOPTS_VALUE ||
1382  pkt->duration > 0 ) {
1383 
1384  /* presentation is not delayed : PTS and DTS are the same */
1385  if (pkt->pts == AV_NOPTS_VALUE)
1386  pkt->pts = pkt->dts;
1388  pkt->pts, pkt);
1389  if (pkt->pts == AV_NOPTS_VALUE)
1390  pkt->pts = st->cur_dts;
1391  pkt->dts = pkt->pts;
1392  if (pkt->pts != AV_NOPTS_VALUE && duration.num >= 0)
1393  st->cur_dts = av_add_stable(st->time_base, pkt->pts, duration, 1);
1394  }
1395  }
1396 
1397  if (pkt->pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
1398  st->pts_buffer[0] = pkt->pts;
1399  for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
1400  FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
1401 
1403  pkt->dts = select_from_pts_buffer(st, st->pts_buffer, pkt->dts);
1404  }
1405  // We skipped it above so we try here.
1406  if (!onein_oneout)
1407  // This should happen on the first packet
1408  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1409  if (pkt->dts > st->cur_dts)
1410  st->cur_dts = pkt->dts;
1411 
1412  if (s->debug & FF_FDEBUG_TS)
1413  av_log(s, AV_LOG_DEBUG, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s st:%d (%d)\n",
1414  presentation_delayed, delay, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), st->index, st->id);
1415 
1416  /* update flags */
1418  pkt->flags |= AV_PKT_FLAG_KEY;
1419 #if FF_API_CONVERGENCE_DURATION
1421  if (pc)
1424 #endif
1425 }
1426 
1427 void ff_packet_list_free(AVPacketList **pkt_buf, AVPacketList **pkt_buf_end)
1428 {
1429  AVPacketList *tmp = *pkt_buf;
1430 
1431  while (tmp) {
1432  AVPacketList *pktl = tmp;
1433  tmp = pktl->next;
1434  av_packet_unref(&pktl->pkt);
1435  av_freep(&pktl);
1436  }
1437  *pkt_buf = NULL;
1438  *pkt_buf_end = NULL;
1439 }
1440 
1441 /**
1442  * Parse a packet, add all split parts to parse_queue.
1443  *
1444  * @param pkt Packet to parse; must not be NULL.
1445  * @param flush Indicates whether to flush. If set, pkt must be blank.
1446  */
1448  int stream_index, int flush)
1449 {
1450  AVPacket out_pkt;
1451  AVStream *st = s->streams[stream_index];
1452  uint8_t *data = pkt->data;
1453  int size = pkt->size;
1454  int ret = 0, got_output = flush;
1455 
1456  if (size || flush) {
1457  av_init_packet(&out_pkt);
1458  } else if (st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
1459  // preserve 0-size sync packets
1461  }
1462 
1463  while (size > 0 || (flush && got_output)) {
1464  int len;
1465  int64_t next_pts = pkt->pts;
1466  int64_t next_dts = pkt->dts;
1467 
1468  len = av_parser_parse2(st->parser, st->internal->avctx,
1469  &out_pkt.data, &out_pkt.size, data, size,
1470  pkt->pts, pkt->dts, pkt->pos);
1471 
1472  pkt->pts = pkt->dts = AV_NOPTS_VALUE;
1473  pkt->pos = -1;
1474  /* increment read pointer */
1475  data += len;
1476  size -= len;
1477 
1478  got_output = !!out_pkt.size;
1479 
1480  if (!out_pkt.size)
1481  continue;
1482 
1483  if (pkt->buf && out_pkt.data == pkt->data) {
1484  /* reference pkt->buf only when out_pkt.data is guaranteed to point
1485  * to data in it and not in the parser's internal buffer. */
1486  /* XXX: Ensure this is the case with all parsers when st->parser->flags
1487  * is PARSER_FLAG_COMPLETE_FRAMES and check for that instead? */
1488  out_pkt.buf = av_buffer_ref(pkt->buf);
1489  if (!out_pkt.buf) {
1490  ret = AVERROR(ENOMEM);
1491  goto fail;
1492  }
1493  } else {
1494  ret = av_packet_make_refcounted(&out_pkt);
1495  if (ret < 0)
1496  goto fail;
1497  }
1498 
1499  if (pkt->side_data) {
1500  out_pkt.side_data = pkt->side_data;
1501  out_pkt.side_data_elems = pkt->side_data_elems;
1502  pkt->side_data = NULL;
1503  pkt->side_data_elems = 0;
1504  }
1505 
1506  /* set the duration */
1507  out_pkt.duration = (st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) ? pkt->duration : 0;
1509  if (st->internal->avctx->sample_rate > 0) {
1510  out_pkt.duration =
1512  (AVRational) { 1, st->internal->avctx->sample_rate },
1513  st->time_base,
1514  AV_ROUND_DOWN);
1515  }
1516  }
1517 
1518  out_pkt.stream_index = st->index;
1519  out_pkt.pts = st->parser->pts;
1520  out_pkt.dts = st->parser->dts;
1521  out_pkt.pos = st->parser->pos;
1522  out_pkt.flags |= pkt->flags & AV_PKT_FLAG_DISCARD;
1523 
1525  out_pkt.pos = st->parser->frame_offset;
1526 
1527  if (st->parser->key_frame == 1 ||
1528  (st->parser->key_frame == -1 &&
1530  out_pkt.flags |= AV_PKT_FLAG_KEY;
1531 
1532  if (st->parser->key_frame == -1 && st->parser->pict_type ==AV_PICTURE_TYPE_NONE && (pkt->flags&AV_PKT_FLAG_KEY))
1533  out_pkt.flags |= AV_PKT_FLAG_KEY;
1534 
1535  compute_pkt_fields(s, st, st->parser, &out_pkt, next_dts, next_pts);
1536 
1539  &out_pkt, 0);
1540  if (ret < 0) {
1541  av_packet_unref(&out_pkt);
1542  goto fail;
1543  }
1544  }
1545 
1546  /* end of the stream => close and free the parser */
1547  if (flush) {
1548  av_parser_close(st->parser);
1549  st->parser = NULL;
1550  }
1551 
1552 fail:
1553  av_packet_unref(pkt);
1554  return ret;
1555 }
1556 
1558  AVPacketList **pkt_buffer_end,
1559  AVPacket *pkt)
1560 {
1561  AVPacketList *pktl;
1562  av_assert0(*pkt_buffer);
1563  pktl = *pkt_buffer;
1564  *pkt = pktl->pkt;
1565  *pkt_buffer = pktl->next;
1566  if (!pktl->next)
1567  *pkt_buffer_end = NULL;
1568  av_freep(&pktl);
1569  return 0;
1570 }
1571 
1572 static int64_t ts_to_samples(AVStream *st, int64_t ts)
1573 {
1574  return av_rescale(ts, st->time_base.num * st->codecpar->sample_rate, st->time_base.den);
1575 }
1576 
1578 {
1579  int ret, i, got_packet = 0;
1580  AVDictionary *metadata = NULL;
1581 
1582  while (!got_packet && !s->internal->parse_queue) {
1583  AVStream *st;
1584 
1585  /* read next packet */
1586  ret = ff_read_packet(s, pkt);
1587  if (ret < 0) {
1588  if (ret == AVERROR(EAGAIN))
1589  return ret;
1590  /* flush the parsers */
1591  for (i = 0; i < s->nb_streams; i++) {
1592  st = s->streams[i];
1593  if (st->parser && st->need_parsing)
1594  parse_packet(s, pkt, st->index, 1);
1595  }
1596  /* all remaining packets are now in parse_queue =>
1597  * really terminate parsing */
1598  break;
1599  }
1600  ret = 0;
1601  st = s->streams[pkt->stream_index];
1602 
1603  /* update context if required */
1604  if (st->internal->need_context_update) {
1605  if (avcodec_is_open(st->internal->avctx)) {
1606  av_log(s, AV_LOG_DEBUG, "Demuxer context update while decoder is open, closing and trying to re-open\n");
1608  st->info->found_decoder = 0;
1609  }
1610 
1611  /* close parser, because it depends on the codec */
1612  if (st->parser && st->internal->avctx->codec_id != st->codecpar->codec_id) {
1613  av_parser_close(st->parser);
1614  st->parser = NULL;
1615  }
1616 
1618  if (ret < 0) {
1619  av_packet_unref(pkt);
1620  return ret;
1621  }
1622 
1623 #if FF_API_LAVF_AVCTX
1625  /* update deprecated public codec context */
1626  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
1627  if (ret < 0) {
1628  av_packet_unref(pkt);
1629  return ret;
1630  }
1632 #endif
1633 
1634  st->internal->need_context_update = 0;
1635  }
1636 
1637  if (pkt->pts != AV_NOPTS_VALUE &&
1638  pkt->dts != AV_NOPTS_VALUE &&
1639  pkt->pts < pkt->dts) {
1641  "Invalid timestamps stream=%d, pts=%s, dts=%s, size=%d\n",
1642  pkt->stream_index,
1643  av_ts2str(pkt->pts),
1644  av_ts2str(pkt->dts),
1645  pkt->size);
1646  }
1647  if (s->debug & FF_FDEBUG_TS)
1648  av_log(s, AV_LOG_DEBUG,
1649  "ff_read_packet stream=%d, pts=%s, dts=%s, size=%d, duration=%"PRId64", flags=%d\n",
1650  pkt->stream_index,
1651  av_ts2str(pkt->pts),
1652  av_ts2str(pkt->dts),
1653  pkt->size, pkt->duration, pkt->flags);
1654 
1655  if (st->need_parsing && !st->parser && !(s->flags & AVFMT_FLAG_NOPARSE)) {
1656  st->parser = av_parser_init(st->codecpar->codec_id);
1657  if (!st->parser) {
1658  av_log(s, AV_LOG_VERBOSE, "parser not found for codec "
1659  "%s, packets or times may be invalid.\n",
1661  /* no parser available: just output the raw packets */
1663  } else if (st->need_parsing == AVSTREAM_PARSE_HEADERS)
1665  else if (st->need_parsing == AVSTREAM_PARSE_FULL_ONCE)
1666  st->parser->flags |= PARSER_FLAG_ONCE;
1667  else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW)
1669  }
1670 
1671  if (!st->need_parsing || !st->parser) {
1672  /* no parsing needed: we just output the packet as is */
1674  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) &&
1675  (pkt->flags & AV_PKT_FLAG_KEY) && pkt->dts != AV_NOPTS_VALUE) {
1676  ff_reduce_index(s, st->index);
1677  av_add_index_entry(st, pkt->pos, pkt->dts,
1678  0, 0, AVINDEX_KEYFRAME);
1679  }
1680  got_packet = 1;
1681  } else if (st->discard < AVDISCARD_ALL) {
1682  if ((ret = parse_packet(s, pkt, pkt->stream_index, 0)) < 0)
1683  return ret;
1685  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
1686  st->codecpar->channels = st->internal->avctx->channels;
1688  st->codecpar->codec_id = st->internal->avctx->codec_id;
1689  } else {
1690  /* free packet */
1691  av_packet_unref(pkt);
1692  }
1693  if (pkt->flags & AV_PKT_FLAG_KEY)
1694  st->skip_to_keyframe = 0;
1695  if (st->skip_to_keyframe) {
1696  av_packet_unref(pkt);
1697  got_packet = 0;
1698  }
1699  }
1700 
1701  if (!got_packet && s->internal->parse_queue)
1703 
1704  if (ret >= 0) {
1705  AVStream *st = s->streams[pkt->stream_index];
1706  int discard_padding = 0;
1707  if (st->first_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
1708  int64_t pts = pkt->pts - (is_relative(pkt->pts) ? RELATIVE_TS_BASE : 0);
1709  int64_t sample = ts_to_samples(st, pts);
1710  int duration = ts_to_samples(st, pkt->duration);
1711  int64_t end_sample = sample + duration;
1712  if (duration > 0 && end_sample >= st->first_discard_sample &&
1713  sample < st->last_discard_sample)
1714  discard_padding = FFMIN(end_sample - st->first_discard_sample, duration);
1715  }
1716  if (st->start_skip_samples && (pkt->pts == 0 || pkt->pts == RELATIVE_TS_BASE))
1717  st->skip_samples = st->start_skip_samples;
1718  if (st->skip_samples || discard_padding) {
1720  if (p) {
1721  AV_WL32(p, st->skip_samples);
1722  AV_WL32(p + 4, discard_padding);
1723  av_log(s, AV_LOG_DEBUG, "demuxer injecting skip %d / discard %d\n", st->skip_samples, discard_padding);
1724  }
1725  st->skip_samples = 0;
1726  }
1727 
1728  if (st->inject_global_side_data) {
1729  for (i = 0; i < st->nb_side_data; i++) {
1730  AVPacketSideData *src_sd = &st->side_data[i];
1731  uint8_t *dst_data;
1732 
1733  if (av_packet_get_side_data(pkt, src_sd->type, NULL))
1734  continue;
1735 
1736  dst_data = av_packet_new_side_data(pkt, src_sd->type, src_sd->size);
1737  if (!dst_data) {
1738  av_log(s, AV_LOG_WARNING, "Could not inject global side data\n");
1739  continue;
1740  }
1741 
1742  memcpy(dst_data, src_sd->data, src_sd->size);
1743  }
1744  st->inject_global_side_data = 0;
1745  }
1746  }
1747 
1748  av_opt_get_dict_val(s, "metadata", AV_OPT_SEARCH_CHILDREN, &metadata);
1749  if (metadata) {
1751  av_dict_copy(&s->metadata, metadata, 0);
1752  av_dict_free(&metadata);
1754  }
1755 
1756 #if FF_API_LAVF_AVCTX
1758 #endif
1759 
1760  if (s->debug & FF_FDEBUG_TS)
1761  av_log(s, AV_LOG_DEBUG,
1762  "read_frame_internal stream=%d, pts=%s, dts=%s, "
1763  "size=%d, duration=%"PRId64", flags=%d\n",
1764  pkt->stream_index,
1765  av_ts2str(pkt->pts),
1766  av_ts2str(pkt->dts),
1767  pkt->size, pkt->duration, pkt->flags);
1768 
1769  /* A demuxer might have returned EOF because of an IO error, let's
1770  * propagate this back to the user. */
1771  if (ret == AVERROR_EOF && s->pb && s->pb->error < 0 && s->pb->error != AVERROR(EAGAIN))
1772  ret = s->pb->error;
1773 
1774  return ret;
1775 }
1776 
1778 {
1779  const int genpts = s->flags & AVFMT_FLAG_GENPTS;
1780  int eof = 0;
1781  int ret;
1782  AVStream *st;
1783 
1784  if (!genpts) {
1785  ret = s->internal->packet_buffer
1787  &s->internal->packet_buffer_end, pkt)
1788  : read_frame_internal(s, pkt);
1789  if (ret < 0)
1790  return ret;
1791  goto return_packet;
1792  }
1793 
1794  for (;;) {
1795  AVPacketList *pktl = s->internal->packet_buffer;
1796 
1797  if (pktl) {
1798  AVPacket *next_pkt = &pktl->pkt;
1799 
1800  if (next_pkt->dts != AV_NOPTS_VALUE) {
1801  int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits;
1802  // last dts seen for this stream. if any of packets following
1803  // current one had no dts, we will set this to AV_NOPTS_VALUE.
1804  int64_t last_dts = next_pkt->dts;
1805  av_assert2(wrap_bits <= 64);
1806  while (pktl && next_pkt->pts == AV_NOPTS_VALUE) {
1807  if (pktl->pkt.stream_index == next_pkt->stream_index &&
1808  av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2ULL << (wrap_bits - 1)) < 0) {
1809  if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2ULL << (wrap_bits - 1))) {
1810  // not B-frame
1811  next_pkt->pts = pktl->pkt.dts;
1812  }
1813  if (last_dts != AV_NOPTS_VALUE) {
1814  // Once last dts was set to AV_NOPTS_VALUE, we don't change it.
1815  last_dts = pktl->pkt.dts;
1816  }
1817  }
1818  pktl = pktl->next;
1819  }
1820  if (eof && next_pkt->pts == AV_NOPTS_VALUE && last_dts != AV_NOPTS_VALUE) {
1821  // Fixing the last reference frame had none pts issue (For MXF etc).
1822  // We only do this when
1823  // 1. eof.
1824  // 2. we are not able to resolve a pts value for current packet.
1825  // 3. the packets for this stream at the end of the files had valid dts.
1826  next_pkt->pts = last_dts + next_pkt->duration;
1827  }
1828  pktl = s->internal->packet_buffer;
1829  }
1830 
1831  /* read packet from packet buffer, if there is data */
1832  st = s->streams[next_pkt->stream_index];
1833  if (!(next_pkt->pts == AV_NOPTS_VALUE && st->discard < AVDISCARD_ALL &&
1834  next_pkt->dts != AV_NOPTS_VALUE && !eof)) {
1836  &s->internal->packet_buffer_end, pkt);
1837  goto return_packet;
1838  }
1839  }
1840 
1841  ret = read_frame_internal(s, pkt);
1842  if (ret < 0) {
1843  if (pktl && ret != AVERROR(EAGAIN)) {
1844  eof = 1;
1845  continue;
1846  } else
1847  return ret;
1848  }
1849 
1852  pkt, 0);
1853  if (ret < 0) {
1854  av_packet_unref(pkt);
1855  return ret;
1856  }
1857  }
1858 
1859 return_packet:
1860 
1861  st = s->streams[pkt->stream_index];
1862  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & AV_PKT_FLAG_KEY) {
1863  ff_reduce_index(s, st->index);
1864  av_add_index_entry(st, pkt->pos, pkt->dts, 0, 0, AVINDEX_KEYFRAME);
1865  }
1866 
1867  if (is_relative(pkt->dts))
1868  pkt->dts -= RELATIVE_TS_BASE;
1869  if (is_relative(pkt->pts))
1870  pkt->pts -= RELATIVE_TS_BASE;
1871 
1872  return ret;
1873 }
1874 
1875 /* XXX: suppress the packet queue */
1877 {
1878  if (!s->internal)
1879  return;
1883 
1885 }
1886 
1887 /*******************************************************/
1888 /* seek support */
1889 
1891 {
1892  int i;
1893  AVStream *st;
1894  int best_stream = 0;
1895  int best_score = INT_MIN;
1896 
1897  if (s->nb_streams <= 0)
1898  return -1;
1899  for (i = 0; i < s->nb_streams; i++) {
1900  int score = 0;
1901  st = s->streams[i];
1902  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1904  score -= 400;
1905  if (st->codecpar->width && st->codecpar->height)
1906  score += 50;
1907  score+= 25;
1908  }
1909  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
1910  if (st->codecpar->sample_rate)
1911  score += 50;
1912  }
1913  if (st->codec_info_nb_frames)
1914  score += 12;
1915 
1916  if (st->discard != AVDISCARD_ALL)
1917  score += 200;
1918 
1919  if (score > best_score) {
1920  best_score = score;
1921  best_stream = i;
1922  }
1923  }
1924  return best_stream;
1925 }
1926 
1927 /** Flush the frame reader. */
1929 {
1930  AVStream *st;
1931  int i, j;
1932 
1933  flush_packet_queue(s);
1934 
1935  /* Reset read state for each stream. */
1936  for (i = 0; i < s->nb_streams; i++) {
1937  st = s->streams[i];
1938 
1939  if (st->parser) {
1940  av_parser_close(st->parser);
1941  st->parser = NULL;
1942  }
1945  if (st->first_dts == AV_NOPTS_VALUE)
1946  st->cur_dts = RELATIVE_TS_BASE;
1947  else
1948  /* We set the current DTS to an unspecified origin. */
1949  st->cur_dts = AV_NOPTS_VALUE;
1950 
1952 
1953  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
1954  st->pts_buffer[j] = AV_NOPTS_VALUE;
1955 
1957  st->inject_global_side_data = 1;
1958 
1959  st->skip_samples = 0;
1960  }
1961 }
1962 
1963 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
1964 {
1965  int i;
1966 
1967  for (i = 0; i < s->nb_streams; i++) {
1968  AVStream *st = s->streams[i];
1969 
1970  st->cur_dts =
1971  av_rescale(timestamp,
1972  st->time_base.den * (int64_t) ref_st->time_base.num,
1973  st->time_base.num * (int64_t) ref_st->time_base.den);
1974  }
1975 }
1976 
1977 void ff_reduce_index(AVFormatContext *s, int stream_index)
1978 {
1979  AVStream *st = s->streams[stream_index];
1980  unsigned int max_entries = s->max_index_size / sizeof(AVIndexEntry);
1981 
1982  if ((unsigned) st->nb_index_entries >= max_entries) {
1983  int i;
1984  for (i = 0; 2 * i < st->nb_index_entries; i++)
1985  st->index_entries[i] = st->index_entries[2 * i];
1986  st->nb_index_entries = i;
1987  }
1988 }
1989 
1990 int ff_add_index_entry(AVIndexEntry **index_entries,
1991  int *nb_index_entries,
1992  unsigned int *index_entries_allocated_size,
1993  int64_t pos, int64_t timestamp,
1994  int size, int distance, int flags)
1995 {
1996  AVIndexEntry *entries, *ie;
1997  int index;
1998 
1999  if ((unsigned) *nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
2000  return -1;
2001 
2002  if (timestamp == AV_NOPTS_VALUE)
2003  return AVERROR(EINVAL);
2004 
2005  if (size < 0 || size > 0x3FFFFFFF)
2006  return AVERROR(EINVAL);
2007 
2008  if (is_relative(timestamp)) //FIXME this maintains previous behavior but we should shift by the correct offset once known
2009  timestamp -= RELATIVE_TS_BASE;
2010 
2011  entries = av_fast_realloc(*index_entries,
2012  index_entries_allocated_size,
2013  (*nb_index_entries + 1) *
2014  sizeof(AVIndexEntry));
2015  if (!entries)
2016  return -1;
2017 
2018  *index_entries = entries;
2019 
2020  index = ff_index_search_timestamp(*index_entries, *nb_index_entries,
2021  timestamp, AVSEEK_FLAG_ANY);
2022 
2023  if (index < 0) {
2024  index = (*nb_index_entries)++;
2025  ie = &entries[index];
2026  av_assert0(index == 0 || ie[-1].timestamp < timestamp);
2027  } else {
2028  ie = &entries[index];
2029  if (ie->timestamp != timestamp) {
2030  if (ie->timestamp <= timestamp)
2031  return -1;
2032  memmove(entries + index + 1, entries + index,
2033  sizeof(AVIndexEntry) * (*nb_index_entries - index));
2034  (*nb_index_entries)++;
2035  } else if (ie->pos == pos && distance < ie->min_distance)
2036  // do not reduce the distance
2037  distance = ie->min_distance;
2038  }
2039 
2040  ie->pos = pos;
2041  ie->timestamp = timestamp;
2042  ie->min_distance = distance;
2043  ie->size = size;
2044  ie->flags = flags;
2045 
2046  return index;
2047 }
2048 
2049 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
2050  int size, int distance, int flags)
2051 {
2052  timestamp = wrap_timestamp(st, timestamp);
2054  &st->index_entries_allocated_size, pos,
2055  timestamp, size, distance, flags);
2056 }
2057 
2058 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
2059  int64_t wanted_timestamp, int flags)
2060 {
2061  int a, b, m;
2062  int64_t timestamp;
2063 
2064  a = -1;
2065  b = nb_entries;
2066 
2067  // Optimize appending index entries at the end.
2068  if (b && entries[b - 1].timestamp < wanted_timestamp)
2069  a = b - 1;
2070 
2071  while (b - a > 1) {
2072  m = (a + b) >> 1;
2073 
2074  // Search for the next non-discarded packet.
2075  while ((entries[m].flags & AVINDEX_DISCARD_FRAME) && m < b && m < nb_entries - 1) {
2076  m++;
2077  if (m == b && entries[m].timestamp >= wanted_timestamp) {
2078  m = b - 1;
2079  break;
2080  }
2081  }
2082 
2083  timestamp = entries[m].timestamp;
2084  if (timestamp >= wanted_timestamp)
2085  b = m;
2086  if (timestamp <= wanted_timestamp)
2087  a = m;
2088  }
2089  m = (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
2090 
2091  if (!(flags & AVSEEK_FLAG_ANY))
2092  while (m >= 0 && m < nb_entries &&
2093  !(entries[m].flags & AVINDEX_KEYFRAME))
2094  m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
2095 
2096  if (m == nb_entries)
2097  return -1;
2098  return m;
2099 }
2100 
2101 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
2102 {
2103  int ist1, ist2;
2104  int64_t pos_delta = 0;
2105  int64_t skip = 0;
2106  //We could use URLProtocol flags here but as many user applications do not use URLProtocols this would be unreliable
2107  const char *proto = avio_find_protocol_name(s->url);
2108 
2109  av_assert0(time_tolerance >= 0);
2110 
2111  if (!proto) {
2112  av_log(s, AV_LOG_INFO,
2113  "Protocol name not provided, cannot determine if input is local or "
2114  "a network protocol, buffers and access patterns cannot be configured "
2115  "optimally without knowing the protocol\n");
2116  }
2117 
2118  if (proto && !(strcmp(proto, "file") && strcmp(proto, "pipe") && strcmp(proto, "cache")))
2119  return;
2120 
2121  for (ist1 = 0; ist1 < s->nb_streams; ist1++) {
2122  AVStream *st1 = s->streams[ist1];
2123  for (ist2 = 0; ist2 < s->nb_streams; ist2++) {
2124  AVStream *st2 = s->streams[ist2];
2125  int i1, i2;
2126 
2127  if (ist1 == ist2)
2128  continue;
2129 
2130  for (i1 = i2 = 0; i1 < st1->nb_index_entries; i1++) {
2131  AVIndexEntry *e1 = &st1->index_entries[i1];
2132  int64_t e1_pts = av_rescale_q(e1->timestamp, st1->time_base, AV_TIME_BASE_Q);
2133 
2134  skip = FFMAX(skip, e1->size);
2135  for (; i2 < st2->nb_index_entries; i2++) {
2136  AVIndexEntry *e2 = &st2->index_entries[i2];
2137  int64_t e2_pts = av_rescale_q(e2->timestamp, st2->time_base, AV_TIME_BASE_Q);
2138  if (e2_pts < e1_pts || e2_pts - (uint64_t)e1_pts < time_tolerance)
2139  continue;
2140  pos_delta = FFMAX(pos_delta, e1->pos - e2->pos);
2141  break;
2142  }
2143  }
2144  }
2145  }
2146 
2147  pos_delta *= 2;
2148  /* XXX This could be adjusted depending on protocol*/
2149  if (s->pb->buffer_size < pos_delta && pos_delta < (1<<24)) {
2150  av_log(s, AV_LOG_VERBOSE, "Reconfiguring buffers to size %"PRId64"\n", pos_delta);
2151 
2152  /* realloc the buffer and the original data will be retained */
2153  if (ffio_realloc_buf(s->pb, pos_delta)) {
2154  av_log(s, AV_LOG_ERROR, "Realloc buffer fail.\n");
2155  return;
2156  }
2157 
2158  s->pb->short_seek_threshold = FFMAX(s->pb->short_seek_threshold, pos_delta/2);
2159  }
2160 
2161  if (skip < (1<<23)) {
2163  }
2164 }
2165 
2166 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp, int flags)
2167 {
2169  wanted_timestamp, flags);
2170 }
2171 
2172 static int64_t ff_read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit,
2173  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2174 {
2175  int64_t ts = read_timestamp(s, stream_index, ppos, pos_limit);
2176  if (stream_index >= 0)
2177  ts = wrap_timestamp(s->streams[stream_index], ts);
2178  return ts;
2179 }
2180 
2181 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
2182  int64_t target_ts, int flags)
2183 {
2184  const AVInputFormat *avif = s->iformat;
2185  int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;
2186  int64_t ts_min, ts_max, ts;
2187  int index;
2188  int64_t ret;
2189  AVStream *st;
2190 
2191  if (stream_index < 0)
2192  return -1;
2193 
2194  av_log(s, AV_LOG_TRACE, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2195 
2196  ts_max =
2197  ts_min = AV_NOPTS_VALUE;
2198  pos_limit = -1; // GCC falsely says it may be uninitialized.
2199 
2200  st = s->streams[stream_index];
2201  if (st->index_entries) {
2202  AVIndexEntry *e;
2203 
2204  /* FIXME: Whole function must be checked for non-keyframe entries in
2205  * index case, especially read_timestamp(). */
2206  index = av_index_search_timestamp(st, target_ts,
2207  flags | AVSEEK_FLAG_BACKWARD);
2208  index = FFMAX(index, 0);
2209  e = &st->index_entries[index];
2210 
2211  if (e->timestamp <= target_ts || e->pos == e->min_distance) {
2212  pos_min = e->pos;
2213  ts_min = e->timestamp;
2214  av_log(s, AV_LOG_TRACE, "using cached pos_min=0x%"PRIx64" dts_min=%s\n",
2215  pos_min, av_ts2str(ts_min));
2216  } else {
2217  av_assert1(index == 0);
2218  }
2219 
2220  index = av_index_search_timestamp(st, target_ts,
2221  flags & ~AVSEEK_FLAG_BACKWARD);
2222  av_assert0(index < st->nb_index_entries);
2223  if (index >= 0) {
2224  e = &st->index_entries[index];
2225  av_assert1(e->timestamp >= target_ts);
2226  pos_max = e->pos;
2227  ts_max = e->timestamp;
2228  pos_limit = pos_max - e->min_distance;
2229  av_log(s, AV_LOG_TRACE, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64
2230  " dts_max=%s\n", pos_max, pos_limit, av_ts2str(ts_max));
2231  }
2232  }
2233 
2234  pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
2235  ts_min, ts_max, flags, &ts, avif->read_timestamp);
2236  if (pos < 0)
2237  return -1;
2238 
2239  /* do the seek */
2240  if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
2241  return ret;
2242 
2244  ff_update_cur_dts(s, st, ts);
2245 
2246  return 0;
2247 }
2248 
2249 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
2250  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2251 {
2252  int64_t step = 1024;
2253  int64_t limit, ts_max;
2254  int64_t filesize = avio_size(s->pb);
2255  int64_t pos_max = filesize - 1;
2256  do {
2257  limit = pos_max;
2258  pos_max = FFMAX(0, (pos_max) - step);
2259  ts_max = ff_read_timestamp(s, stream_index,
2260  &pos_max, limit, read_timestamp);
2261  step += step;
2262  } while (ts_max == AV_NOPTS_VALUE && 2*limit > step);
2263  if (ts_max == AV_NOPTS_VALUE)
2264  return -1;
2265 
2266  for (;;) {
2267  int64_t tmp_pos = pos_max + 1;
2268  int64_t tmp_ts = ff_read_timestamp(s, stream_index,
2269  &tmp_pos, INT64_MAX, read_timestamp);
2270  if (tmp_ts == AV_NOPTS_VALUE)
2271  break;
2272  av_assert0(tmp_pos > pos_max);
2273  ts_max = tmp_ts;
2274  pos_max = tmp_pos;
2275  if (tmp_pos >= filesize)
2276  break;
2277  }
2278 
2279  if (ts)
2280  *ts = ts_max;
2281  if (pos)
2282  *pos = pos_max;
2283 
2284  return 0;
2285 }
2286 
2287 int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts,
2288  int64_t pos_min, int64_t pos_max, int64_t pos_limit,
2289  int64_t ts_min, int64_t ts_max,
2290  int flags, int64_t *ts_ret,
2291  int64_t (*read_timestamp)(struct AVFormatContext *, int,
2292  int64_t *, int64_t))
2293 {
2294  int64_t pos, ts;
2295  int64_t start_pos;
2296  int no_change;
2297  int ret;
2298 
2299  av_log(s, AV_LOG_TRACE, "gen_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2300 
2301  if (ts_min == AV_NOPTS_VALUE) {
2302  pos_min = s->internal->data_offset;
2303  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2304  if (ts_min == AV_NOPTS_VALUE)
2305  return -1;
2306  }
2307 
2308  if (ts_min >= target_ts) {
2309  *ts_ret = ts_min;
2310  return pos_min;
2311  }
2312 
2313  if (ts_max == AV_NOPTS_VALUE) {
2314  if ((ret = ff_find_last_ts(s, stream_index, &ts_max, &pos_max, read_timestamp)) < 0)
2315  return ret;
2316  pos_limit = pos_max;
2317  }
2318 
2319  if (ts_max <= target_ts) {
2320  *ts_ret = ts_max;
2321  return pos_max;
2322  }
2323 
2324  av_assert0(ts_min < ts_max);
2325 
2326  no_change = 0;
2327  while (pos_min < pos_limit) {
2328  av_log(s, AV_LOG_TRACE,
2329  "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%s dts_max=%s\n",
2330  pos_min, pos_max, av_ts2str(ts_min), av_ts2str(ts_max));
2331  av_assert0(pos_limit <= pos_max);
2332 
2333  if (no_change == 0) {
2334  int64_t approximate_keyframe_distance = pos_max - pos_limit;
2335  // interpolate position (better than dichotomy)
2336  pos = av_rescale(target_ts - ts_min, pos_max - pos_min,
2337  ts_max - ts_min) +
2338  pos_min - approximate_keyframe_distance;
2339  } else if (no_change == 1) {
2340  // bisection if interpolation did not change min / max pos last time
2341  pos = (pos_min + pos_limit) >> 1;
2342  } else {
2343  /* linear search if bisection failed, can only happen if there
2344  * are very few or no keyframes between min/max */
2345  pos = pos_min;
2346  }
2347  if (pos <= pos_min)
2348  pos = pos_min + 1;
2349  else if (pos > pos_limit)
2350  pos = pos_limit;
2351  start_pos = pos;
2352 
2353  // May pass pos_limit instead of -1.
2354  ts = ff_read_timestamp(s, stream_index, &pos, INT64_MAX, read_timestamp);
2355  if (pos == pos_max)
2356  no_change++;
2357  else
2358  no_change = 0;
2359  av_log(s, AV_LOG_TRACE, "%"PRId64" %"PRId64" %"PRId64" / %s %s %s"
2360  " target:%s limit:%"PRId64" start:%"PRId64" noc:%d\n",
2361  pos_min, pos, pos_max,
2362  av_ts2str(ts_min), av_ts2str(ts), av_ts2str(ts_max), av_ts2str(target_ts),
2363  pos_limit, start_pos, no_change);
2364  if (ts == AV_NOPTS_VALUE) {
2365  av_log(s, AV_LOG_ERROR, "read_timestamp() failed in the middle\n");
2366  return -1;
2367  }
2368  if (target_ts <= ts) {
2369  pos_limit = start_pos - 1;
2370  pos_max = pos;
2371  ts_max = ts;
2372  }
2373  if (target_ts >= ts) {
2374  pos_min = pos;
2375  ts_min = ts;
2376  }
2377  }
2378 
2379  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
2380  ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
2381 #if 0
2382  pos_min = pos;
2383  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2384  pos_min++;
2385  ts_max = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2386  av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" %s<=%s<=%s\n",
2387  pos, av_ts2str(ts_min), av_ts2str(target_ts), av_ts2str(ts_max));
2388 #endif
2389  *ts_ret = ts;
2390  return pos;
2391 }
2392 
2393 static int seek_frame_byte(AVFormatContext *s, int stream_index,
2394  int64_t pos, int flags)
2395 {
2396  int64_t pos_min, pos_max;
2397 
2398  pos_min = s->internal->data_offset;
2399  pos_max = avio_size(s->pb) - 1;
2400 
2401  if (pos < pos_min)
2402  pos = pos_min;
2403  else if (pos > pos_max)
2404  pos = pos_max;
2405 
2406  avio_seek(s->pb, pos, SEEK_SET);
2407 
2408  s->io_repositioned = 1;
2409 
2410  return 0;
2411 }
2412 
2413 static int seek_frame_generic(AVFormatContext *s, int stream_index,
2414  int64_t timestamp, int flags)
2415 {
2416  int index;
2417  int64_t ret;
2418  AVStream *st;
2419  AVIndexEntry *ie;
2420 
2421  st = s->streams[stream_index];
2422 
2423  index = av_index_search_timestamp(st, timestamp, flags);
2424 
2425  if (index < 0 && st->nb_index_entries &&
2426  timestamp < st->index_entries[0].timestamp)
2427  return -1;
2428 
2429  if (index < 0 || index == st->nb_index_entries - 1) {
2430  AVPacket pkt;
2431  int nonkey = 0;
2432 
2433  if (st->nb_index_entries) {
2435  ie = &st->index_entries[st->nb_index_entries - 1];
2436  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2437  return ret;
2438  ff_update_cur_dts(s, st, ie->timestamp);
2439  } else {
2440  if ((ret = avio_seek(s->pb, s->internal->data_offset, SEEK_SET)) < 0)
2441  return ret;
2442  }
2443  for (;;) {
2444  int read_status;
2445  do {
2446  read_status = av_read_frame(s, &pkt);
2447  } while (read_status == AVERROR(EAGAIN));
2448  if (read_status < 0)
2449  break;
2450  if (stream_index == pkt.stream_index && pkt.dts > timestamp) {
2451  if (pkt.flags & AV_PKT_FLAG_KEY) {
2452  av_packet_unref(&pkt);
2453  break;
2454  }
2455  if (nonkey++ > 1000 && st->codecpar->codec_id != AV_CODEC_ID_CDGRAPHICS) {
2456  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);
2457  av_packet_unref(&pkt);
2458  break;
2459  }
2460  }
2461  av_packet_unref(&pkt);
2462  }
2463  index = av_index_search_timestamp(st, timestamp, flags);
2464  }
2465  if (index < 0)
2466  return -1;
2467 
2469  if (s->iformat->read_seek)
2470  if (s->iformat->read_seek(s, stream_index, timestamp, flags) >= 0)
2471  return 0;
2472  ie = &st->index_entries[index];
2473  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2474  return ret;
2475  ff_update_cur_dts(s, st, ie->timestamp);
2476 
2477  return 0;
2478 }
2479 
2480 static int seek_frame_internal(AVFormatContext *s, int stream_index,
2481  int64_t timestamp, int flags)
2482 {
2483  int ret;
2484  AVStream *st;
2485 
2486  if (flags & AVSEEK_FLAG_BYTE) {
2487  if (s->iformat->flags & AVFMT_NO_BYTE_SEEK)
2488  return -1;
2490  return seek_frame_byte(s, stream_index, timestamp, flags);
2491  }
2492 
2493  if (stream_index < 0) {
2494  stream_index = av_find_default_stream_index(s);
2495  if (stream_index < 0)
2496  return -1;
2497 
2498  st = s->streams[stream_index];
2499  /* timestamp for default must be expressed in AV_TIME_BASE units */
2500  timestamp = av_rescale(timestamp, st->time_base.den,
2501  AV_TIME_BASE * (int64_t) st->time_base.num);
2502  }
2503 
2504  /* first, we try the format specific seek */
2505  if (s->iformat->read_seek) {
2507  ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
2508  } else
2509  ret = -1;
2510  if (ret >= 0)
2511  return 0;
2512 
2513  if (s->iformat->read_timestamp &&
2514  !(s->iformat->flags & AVFMT_NOBINSEARCH)) {
2516  return ff_seek_frame_binary(s, stream_index, timestamp, flags);
2517  } else if (!(s->iformat->flags & AVFMT_NOGENSEARCH)) {
2519  return seek_frame_generic(s, stream_index, timestamp, flags);
2520  } else
2521  return -1;
2522 }
2523 
2524 int av_seek_frame(AVFormatContext *s, int stream_index,
2525  int64_t timestamp, int flags)
2526 {
2527  int ret;
2528 
2529  if (s->iformat->read_seek2 && !s->iformat->read_seek) {
2530  int64_t min_ts = INT64_MIN, max_ts = INT64_MAX;
2531  if ((flags & AVSEEK_FLAG_BACKWARD))
2532  max_ts = timestamp;
2533  else
2534  min_ts = timestamp;
2535  return avformat_seek_file(s, stream_index, min_ts, timestamp, max_ts,
2536  flags & ~AVSEEK_FLAG_BACKWARD);
2537  }
2538 
2539  ret = seek_frame_internal(s, stream_index, timestamp, flags);
2540 
2541  if (ret >= 0)
2543 
2544  return ret;
2545 }
2546 
2547 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
2548  int64_t ts, int64_t max_ts, int flags)
2549 {
2550  if (min_ts > ts || max_ts < ts)
2551  return -1;
2552  if (stream_index < -1 || stream_index >= (int)s->nb_streams)
2553  return AVERROR(EINVAL);
2554 
2555  if (s->seek2any>0)
2556  flags |= AVSEEK_FLAG_ANY;
2557  flags &= ~AVSEEK_FLAG_BACKWARD;
2558 
2559  if (s->iformat->read_seek2) {
2560  int ret;
2562 
2563  if (stream_index == -1 && s->nb_streams == 1) {
2564  AVRational time_base = s->streams[0]->time_base;
2565  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
2566  min_ts = av_rescale_rnd(min_ts, time_base.den,
2567  time_base.num * (int64_t)AV_TIME_BASE,
2569  max_ts = av_rescale_rnd(max_ts, time_base.den,
2570  time_base.num * (int64_t)AV_TIME_BASE,
2572  stream_index = 0;
2573  }
2574 
2575  ret = s->iformat->read_seek2(s, stream_index, min_ts,
2576  ts, max_ts, flags);
2577 
2578  if (ret >= 0)
2580  return ret;
2581  }
2582 
2583  if (s->iformat->read_timestamp) {
2584  // try to seek via read_timestamp()
2585  }
2586 
2587  // Fall back on old API if new is not implemented but old is.
2588  // Note the old API has somewhat different semantics.
2589  if (s->iformat->read_seek || 1) {
2590  int dir = (ts - (uint64_t)min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);
2591  int ret = av_seek_frame(s, stream_index, ts, flags | dir);
2592  if (ret<0 && ts != min_ts && max_ts != ts) {
2593  ret = av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);
2594  if (ret >= 0)
2595  ret = av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));
2596  }
2597  return ret;
2598  }
2599 
2600  // try some generic seek like seek_frame_generic() but with new ts semantics
2601  return -1; //unreachable
2602 }
2603 
2605 {
2607  return 0;
2608 }
2609 
2610 /*******************************************************/
2611 
2612 /**
2613  * Return TRUE if the stream has accurate duration in any stream.
2614  *
2615  * @return TRUE if the stream has accurate duration for at least one component.
2616  */
2618 {
2619  int i;
2620  AVStream *st;
2621 
2622  for (i = 0; i < ic->nb_streams; i++) {
2623  st = ic->streams[i];
2624  if (st->duration != AV_NOPTS_VALUE)
2625  return 1;
2626  }
2627  if (ic->duration != AV_NOPTS_VALUE)
2628  return 1;
2629  return 0;
2630 }
2631 
2632 /**
2633  * Estimate the stream timings from the one of each components.
2634  *
2635  * Also computes the global bitrate if possible.
2636  */
2638 {
2639  int64_t start_time, start_time1, start_time_text, end_time, end_time1, end_time_text;
2640  int64_t duration, duration1, duration_text, filesize;
2641  int i;
2642  AVProgram *p;
2643 
2644  start_time = INT64_MAX;
2645  start_time_text = INT64_MAX;
2646  end_time = INT64_MIN;
2647  end_time_text = INT64_MIN;
2648  duration = INT64_MIN;
2649  duration_text = INT64_MIN;
2650 
2651  for (i = 0; i < ic->nb_streams; i++) {
2652  AVStream *st = ic->streams[i];
2653  int is_text = st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ||
2655  if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
2656  start_time1 = av_rescale_q(st->start_time, st->time_base,
2657  AV_TIME_BASE_Q);
2658  if (is_text)
2659  start_time_text = FFMIN(start_time_text, start_time1);
2660  else
2661  start_time = FFMIN(start_time, start_time1);
2662  end_time1 = av_rescale_q_rnd(st->duration, st->time_base,
2665  if (end_time1 != AV_NOPTS_VALUE && (end_time1 > 0 ? start_time1 <= INT64_MAX - end_time1 : start_time1 >= INT64_MIN - end_time1)) {
2666  end_time1 += start_time1;
2667  if (is_text)
2668  end_time_text = FFMAX(end_time_text, end_time1);
2669  else
2670  end_time = FFMAX(end_time, end_time1);
2671  }
2672  for (p = NULL; (p = av_find_program_from_stream(ic, p, i)); ) {
2673  if (p->start_time == AV_NOPTS_VALUE || p->start_time > start_time1)
2674  p->start_time = start_time1;
2675  if (p->end_time < end_time1)
2676  p->end_time = end_time1;
2677  }
2678  }
2679  if (st->duration != AV_NOPTS_VALUE) {
2680  duration1 = av_rescale_q(st->duration, st->time_base,
2681  AV_TIME_BASE_Q);
2682  if (is_text)
2683  duration_text = FFMAX(duration_text, duration1);
2684  else
2685  duration = FFMAX(duration, duration1);
2686  }
2687  }
2688  if (start_time == INT64_MAX || (start_time > start_time_text && start_time - (uint64_t)start_time_text < AV_TIME_BASE))
2689  start_time = start_time_text;
2690  else if (start_time > start_time_text)
2691  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream starttime %f\n", start_time_text / (float)AV_TIME_BASE);
2692 
2693  if (end_time == INT64_MIN || (end_time < end_time_text && end_time_text - (uint64_t)end_time < AV_TIME_BASE))
2694  end_time = end_time_text;
2695  else if (end_time < end_time_text)
2696  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream endtime %f\n", end_time_text / (float)AV_TIME_BASE);
2697 
2698  if (duration == INT64_MIN || (duration < duration_text && duration_text - duration < AV_TIME_BASE))
2699  duration = duration_text;
2700  else if (duration < duration_text)
2701  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream duration %f\n", duration_text / (float)AV_TIME_BASE);
2702 
2703  if (start_time != INT64_MAX) {
2704  ic->start_time = start_time;
2705  if (end_time != INT64_MIN) {
2706  if (ic->nb_programs > 1) {
2707  for (i = 0; i < ic->nb_programs; i++) {
2708  p = ic->programs[i];
2709  if (p->start_time != AV_NOPTS_VALUE &&
2710  p->end_time > p->start_time &&
2711  p->end_time - (uint64_t)p->start_time <= INT64_MAX)
2712  duration = FFMAX(duration, p->end_time - p->start_time);
2713  }
2714  } else if (end_time >= start_time && end_time - (uint64_t)start_time <= INT64_MAX) {
2715  duration = FFMAX(duration, end_time - start_time);
2716  }
2717  }
2718  }
2719  if (duration != INT64_MIN && duration > 0 && ic->duration == AV_NOPTS_VALUE) {
2720  ic->duration = duration;
2721  }
2722  if (ic->pb && (filesize = avio_size(ic->pb)) > 0 && ic->duration > 0) {
2723  /* compute the bitrate */
2724  double bitrate = (double) filesize * 8.0 * AV_TIME_BASE /
2725  (double) ic->duration;
2726  if (bitrate >= 0 && bitrate <= INT64_MAX)
2727  ic->bit_rate = bitrate;
2728  }
2729 }
2730 
2732 {
2733  int i;
2734  AVStream *st;
2735 
2737  for (i = 0; i < ic->nb_streams; i++) {
2738  st = ic->streams[i];
2739  if (st->start_time == AV_NOPTS_VALUE) {
2740  if (ic->start_time != AV_NOPTS_VALUE)
2742  st->time_base);
2743  if (ic->duration != AV_NOPTS_VALUE)
2745  st->time_base);
2746  }
2747  }
2748 }
2749 
2751 {
2752  int64_t filesize, duration;
2753  int i, show_warning = 0;
2754  AVStream *st;
2755 
2756  /* if bit_rate is already set, we believe it */
2757  if (ic->bit_rate <= 0) {
2758  int64_t bit_rate = 0;
2759  for (i = 0; i < ic->nb_streams; i++) {
2760  st = ic->streams[i];
2761  if (st->codecpar->bit_rate <= 0 && st->internal->avctx->bit_rate > 0)
2762  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
2763  if (st->codecpar->bit_rate > 0) {
2764  if (INT64_MAX - st->codecpar->bit_rate < bit_rate) {
2765  bit_rate = 0;
2766  break;
2767  }
2768  bit_rate += st->codecpar->bit_rate;
2769  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->codec_info_nb_frames > 1) {
2770  // If we have a videostream with packets but without a bitrate
2771  // then consider the sum not known
2772  bit_rate = 0;
2773  break;
2774  }
2775  }
2776  ic->bit_rate = bit_rate;
2777  }
2778 
2779  /* if duration is already set, we believe it */
2780  if (ic->duration == AV_NOPTS_VALUE &&
2781  ic->bit_rate != 0) {
2782  filesize = ic->pb ? avio_size(ic->pb) : 0;
2783  if (filesize > ic->internal->data_offset) {
2784  filesize -= ic->internal->data_offset;
2785  for (i = 0; i < ic->nb_streams; i++) {
2786  st = ic->streams[i];
2787  if ( st->time_base.num <= INT64_MAX / ic->bit_rate
2788  && st->duration == AV_NOPTS_VALUE) {
2789  duration = av_rescale(8 * filesize, st->time_base.den,
2790  ic->bit_rate *
2791  (int64_t) st->time_base.num);
2792  st->duration = duration;
2793  show_warning = 1;
2794  }
2795  }
2796  }
2797  }
2798  if (show_warning)
2799  av_log(ic, AV_LOG_WARNING,
2800  "Estimating duration from bitrate, this may be inaccurate\n");
2801 }
2802 
2803 #define DURATION_MAX_READ_SIZE 250000LL
2804 #define DURATION_MAX_RETRY 6
2805 
2806 /* only usable for MPEG-PS streams */
2807 static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
2808 {
2809  AVPacket pkt1, *pkt = &pkt1;
2810  AVStream *st;
2811  int num, den, read_size, i, ret;
2812  int found_duration = 0;
2813  int is_end;
2814  int64_t filesize, offset, duration;
2815  int retry = 0;
2816 
2817  /* flush packet queue */
2818  flush_packet_queue(ic);
2819 
2820  for (i = 0; i < ic->nb_streams; i++) {
2821  st = ic->streams[i];
2822  if (st->start_time == AV_NOPTS_VALUE &&
2823  st->first_dts == AV_NOPTS_VALUE &&
2825  av_log(ic, AV_LOG_WARNING,
2826  "start time for stream %d is not set in estimate_timings_from_pts\n", i);
2827 
2828  if (st->parser) {
2829  av_parser_close(st->parser);
2830  st->parser = NULL;
2831  }
2832  }
2833 
2835  av_log(ic, AV_LOG_INFO, "Skipping duration calculation in estimate_timings_from_pts\n");
2836  goto skip_duration_calc;
2837  }
2838 
2839  av_opt_set(ic, "skip_changes", "1", AV_OPT_SEARCH_CHILDREN);
2840  /* estimate the end time (duration) */
2841  /* XXX: may need to support wrapping */
2842  filesize = ic->pb ? avio_size(ic->pb) : 0;
2843  do {
2844  is_end = found_duration;
2845  offset = filesize - (DURATION_MAX_READ_SIZE << retry);
2846  if (offset < 0)
2847  offset = 0;
2848 
2849  avio_seek(ic->pb, offset, SEEK_SET);
2850  read_size = 0;
2851  for (;;) {
2852  if (read_size >= DURATION_MAX_READ_SIZE << (FFMAX(retry - 1, 0)))
2853  break;
2854 
2855  do {
2856  ret = ff_read_packet(ic, pkt);
2857  } while (ret == AVERROR(EAGAIN));
2858  if (ret != 0)
2859  break;
2860  read_size += pkt->size;
2861  st = ic->streams[pkt->stream_index];
2862  if (pkt->pts != AV_NOPTS_VALUE &&
2863  (st->start_time != AV_NOPTS_VALUE ||
2864  st->first_dts != AV_NOPTS_VALUE)) {
2865  if (pkt->duration == 0) {
2866  ff_compute_frame_duration(ic, &num, &den, st, st->parser, pkt);
2867  if (den && num) {
2868  pkt->duration = av_rescale_rnd(1,
2869  num * (int64_t) st->time_base.den,
2870  den * (int64_t) st->time_base.num,
2871  AV_ROUND_DOWN);
2872  }
2873  }
2874  duration = pkt->pts + pkt->duration;
2875  found_duration = 1;
2876  if (st->start_time != AV_NOPTS_VALUE)
2877  duration -= st->start_time;
2878  else
2879  duration -= st->first_dts;
2880  if (duration > 0) {
2881  if (st->duration == AV_NOPTS_VALUE || st->info->last_duration<= 0 ||
2882  (st->duration < duration && FFABS(duration - st->info->last_duration) < 60LL*st->time_base.den / st->time_base.num))
2883  st->duration = duration;
2884  st->info->last_duration = duration;
2885  }
2886  }
2887  av_packet_unref(pkt);
2888  }
2889 
2890  /* check if all audio/video streams have valid duration */
2891  if (!is_end) {
2892  is_end = 1;
2893  for (i = 0; i < ic->nb_streams; i++) {
2894  st = ic->streams[i];
2895  switch (st->codecpar->codec_type) {
2896  case AVMEDIA_TYPE_VIDEO:
2897  case AVMEDIA_TYPE_AUDIO:
2898  if (st->duration == AV_NOPTS_VALUE)
2899  is_end = 0;
2900  }
2901  }
2902  }
2903  } while (!is_end &&
2904  offset &&
2905  ++retry <= DURATION_MAX_RETRY);
2906 
2907  av_opt_set(ic, "skip_changes", "0", AV_OPT_SEARCH_CHILDREN);
2908 
2909  /* warn about audio/video streams which duration could not be estimated */
2910  for (i = 0; i < ic->nb_streams; i++) {
2911  st = ic->streams[i];
2912  if (st->duration == AV_NOPTS_VALUE) {
2913  switch (st->codecpar->codec_type) {
2914  case AVMEDIA_TYPE_VIDEO:
2915  case AVMEDIA_TYPE_AUDIO:
2916  if (st->start_time != AV_NOPTS_VALUE || st->first_dts != AV_NOPTS_VALUE) {
2917  av_log(ic, AV_LOG_WARNING, "stream %d : no PTS found at end of file, duration not set\n", i);
2918  } else
2919  av_log(ic, AV_LOG_WARNING, "stream %d : no TS found at start of file, duration not set\n", i);
2920  }
2921  }
2922  }
2923 skip_duration_calc:
2925 
2926  avio_seek(ic->pb, old_offset, SEEK_SET);
2927  for (i = 0; i < ic->nb_streams; i++) {
2928  int j;
2929 
2930  st = ic->streams[i];
2931  st->cur_dts = st->first_dts;
2934  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
2935  st->pts_buffer[j] = AV_NOPTS_VALUE;
2936  }
2937 }
2938 
2939 /* 1:1 map to AVDurationEstimationMethod */
2940 static const char *duration_name[] = {
2941  [AVFMT_DURATION_FROM_PTS] = "pts",
2942  [AVFMT_DURATION_FROM_STREAM] = "stream",
2943  [AVFMT_DURATION_FROM_BITRATE] = "bit rate",
2944 };
2945 
2947 {
2948  return duration_name[method];
2949 }
2950 
2951 static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
2952 {
2953  int64_t file_size;
2954 
2955  /* get the file size, if possible */
2956  if (ic->iformat->flags & AVFMT_NOFILE) {
2957  file_size = 0;
2958  } else {
2959  file_size = avio_size(ic->pb);
2960  file_size = FFMAX(0, file_size);
2961  }
2962 
2963  if ((!strcmp(ic->iformat->name, "mpeg") ||
2964  !strcmp(ic->iformat->name, "mpegts")) &&
2965  file_size && (ic->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
2966  /* get accurate estimate from the PTSes */
2967  estimate_timings_from_pts(ic, old_offset);
2969  } else if (has_duration(ic)) {
2970  /* at least one component has timings - we use them for all
2971  * the components */
2973  /* nut demuxer estimate the duration from PTS */
2974  if(!strcmp(ic->iformat->name, "nut"))
2976  else
2978  } else {
2979  /* less precise: use bitrate info */
2982  }
2984 
2985  {
2986  int i;
2987  AVStream av_unused *st;
2988  for (i = 0; i < ic->nb_streams; i++) {
2989  st = ic->streams[i];
2990  if (st->time_base.den)
2991  av_log(ic, AV_LOG_TRACE, "stream %d: start_time: %0.3f duration: %0.3f\n", i,
2992  (double) st->start_time * av_q2d(st->time_base),
2993  (double) st->duration * av_q2d(st->time_base));
2994  }
2995  av_log(ic, AV_LOG_TRACE,
2996  "format: start_time: %0.3f duration: %0.3f (estimate from %s) bitrate=%"PRId64" kb/s\n",
2997  (double) ic->start_time / AV_TIME_BASE,
2998  (double) ic->duration / AV_TIME_BASE,
3000  (int64_t)ic->bit_rate / 1000);
3001  }
3002 }
3003 
3004 static int has_codec_parameters(AVStream *st, const char **errmsg_ptr)
3005 {
3006  AVCodecContext *avctx = st->internal->avctx;
3007 
3008 #define FAIL(errmsg) do { \
3009  if (errmsg_ptr) \
3010  *errmsg_ptr = errmsg; \
3011  return 0; \
3012  } while (0)
3013 
3014  if ( avctx->codec_id == AV_CODEC_ID_NONE
3015  && avctx->codec_type != AVMEDIA_TYPE_DATA)
3016  FAIL("unknown codec");
3017  switch (avctx->codec_type) {
3018  case AVMEDIA_TYPE_AUDIO:
3019  if (!avctx->frame_size && determinable_frame_size(avctx))
3020  FAIL("unspecified frame size");
3021  if (st->info->found_decoder >= 0 &&
3022  avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
3023  FAIL("unspecified sample format");
3024  if (!avctx->sample_rate)
3025  FAIL("unspecified sample rate");
3026  if (!avctx->channels)
3027  FAIL("unspecified number of channels");
3028  if (st->info->found_decoder >= 0 && !st->nb_decoded_frames && avctx->codec_id == AV_CODEC_ID_DTS)
3029  FAIL("no decodable DTS frames");
3030  break;
3031  case AVMEDIA_TYPE_VIDEO:
3032  if (!avctx->width)
3033  FAIL("unspecified size");
3034  if (st->info->found_decoder >= 0 && avctx->pix_fmt == AV_PIX_FMT_NONE)
3035  FAIL("unspecified pixel format");
3038  FAIL("no frame in rv30/40 and no sar");
3039  break;
3040  case AVMEDIA_TYPE_SUBTITLE:
3041  if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
3042  FAIL("unspecified size");
3043  break;
3044  case AVMEDIA_TYPE_DATA:
3045  if (avctx->codec_id == AV_CODEC_ID_NONE) return 1;
3046  }
3047 
3048  return 1;
3049 }
3050 
3051 /* returns 1 or 0 if or if not decoded data was returned, or a negative error */
3053  const AVPacket *avpkt, AVDictionary **options)
3054 {
3055  AVCodecContext *avctx = st->internal->avctx;
3056  const AVCodec *codec;
3057  int got_picture = 1, ret = 0;
3059  AVSubtitle subtitle;
3060  AVPacket pkt = *avpkt;
3061  int do_skip_frame = 0;
3062  enum AVDiscard skip_frame;
3063 
3064  if (!frame)
3065  return AVERROR(ENOMEM);
3066 
3067  if (!avcodec_is_open(avctx) &&
3068  st->info->found_decoder <= 0 &&
3069  (st->codecpar->codec_id != -st->info->found_decoder || !st->codecpar->codec_id)) {
3070  AVDictionary *thread_opt = NULL;
3071 
3072  codec = find_probe_decoder(s, st, st->codecpar->codec_id);
3073 
3074  if (!codec) {
3075  st->info->found_decoder = -st->codecpar->codec_id;
3076  ret = -1;
3077  goto fail;
3078  }
3079 
3080  /* Force thread count to 1 since the H.264 decoder will not extract
3081  * SPS and PPS to extradata during multi-threaded decoding. */
3082  av_dict_set(options ? options : &thread_opt, "threads", "1", 0);
3083  if (s->codec_whitelist)
3084  av_dict_set(options ? options : &thread_opt, "codec_whitelist", s->codec_whitelist, 0);
3085  ret = avcodec_open2(avctx, codec, options ? options : &thread_opt);
3086  if (!options)
3087  av_dict_free(&thread_opt);
3088  if (ret < 0) {
3089  st->info->found_decoder = -avctx->codec_id;
3090  goto fail;
3091  }
3092  st->info->found_decoder = 1;
3093  } else if (!st->info->found_decoder)
3094  st->info->found_decoder = 1;
3095 
3096  if (st->info->found_decoder < 0) {
3097  ret = -1;
3098  goto fail;
3099  }
3100 
3102  do_skip_frame = 1;
3103  skip_frame = avctx->skip_frame;
3104  avctx->skip_frame = AVDISCARD_ALL;
3105  }
3106 
3107  while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
3108  ret >= 0 &&
3110  (!st->codec_info_nb_frames &&
3112  got_picture = 0;
3113  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
3114  avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
3115  ret = avcodec_send_packet(avctx, &pkt);
3116  if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3117  break;
3118  if (ret >= 0)
3119  pkt.size = 0;
3120  ret = avcodec_receive_frame(avctx, frame);
3121  if (ret >= 0)
3122  got_picture = 1;
3123  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
3124  ret = 0;
3125  } else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
3126  ret = avcodec_decode_subtitle2(avctx, &subtitle,
3127  &got_picture, &pkt);
3128  if (ret >= 0)
3129  pkt.size = 0;
3130  }
3131  if (ret >= 0) {
3132  if (got_picture)
3133  st->nb_decoded_frames++;
3134  ret = got_picture;
3135  }
3136  }
3137 
3138  if (!pkt.data && !got_picture)
3139  ret = -1;
3140 
3141 fail:
3142  if (do_skip_frame) {
3143  avctx->skip_frame = skip_frame;
3144  }
3145 
3146  av_frame_free(&frame);
3147  return ret;
3148 }
3149 
3150 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
3151 {
3152  while (tags->id != AV_CODEC_ID_NONE) {
3153  if (tags->id == id)
3154  return tags->tag;
3155  tags++;
3156  }
3157  return 0;
3158 }
3159 
3160 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
3161 {
3162  int i;
3163  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3164  if (tag == tags[i].tag)
3165  return tags[i].id;
3166  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3167  if (avpriv_toupper4(tag) == avpriv_toupper4(tags[i].tag))
3168  return tags[i].id;
3169  return AV_CODEC_ID_NONE;
3170 }
3171 
3172 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
3173 {
3174  if (bps <= 0 || bps > 64)
3175  return AV_CODEC_ID_NONE;
3176 
3177  if (flt) {
3178  switch (bps) {
3179  case 32:
3181  case 64:
3183  default:
3184  return AV_CODEC_ID_NONE;
3185  }
3186  } else {
3187  bps += 7;
3188  bps >>= 3;
3189  if (sflags & (1 << (bps - 1))) {
3190  switch (bps) {
3191  case 1:
3192  return AV_CODEC_ID_PCM_S8;
3193  case 2:
3195  case 3:
3197  case 4:
3199  case 8:
3201  default:
3202  return AV_CODEC_ID_NONE;
3203  }
3204  } else {
3205  switch (bps) {
3206  case 1:
3207  return AV_CODEC_ID_PCM_U8;
3208  case 2:
3210  case 3:
3212  case 4:
3214  default:
3215  return AV_CODEC_ID_NONE;
3216  }
3217  }
3218  }
3219 }
3220 
3221 unsigned int av_codec_get_tag(const AVCodecTag *const *tags, enum AVCodecID id)
3222 {
3223  unsigned int tag;
3224  if (!av_codec_get_tag2(tags, id, &tag))
3225  return 0;
3226  return tag;
3227 }
3228 
3229 int av_codec_get_tag2(const AVCodecTag * const *tags, enum AVCodecID id,
3230  unsigned int *tag)
3231 {
3232  int i;
3233  for (i = 0; tags && tags[i]; i++) {
3234  const AVCodecTag *codec_tags = tags[i];
3235  while (codec_tags->id != AV_CODEC_ID_NONE) {
3236  if (codec_tags->id == id) {
3237  *tag = codec_tags->tag;
3238  return 1;
3239  }
3240  codec_tags++;
3241  }
3242  }
3243  return 0;
3244 }
3245 
3246 enum AVCodecID av_codec_get_id(const AVCodecTag *const *tags, unsigned int tag)
3247 {
3248  int i;
3249  for (i = 0; tags && tags[i]; i++) {
3250  enum AVCodecID id = ff_codec_get_id(tags[i], tag);
3251  if (id != AV_CODEC_ID_NONE)
3252  return id;
3253  }
3254  return AV_CODEC_ID_NONE;
3255 }
3256 
3258 {
3259  unsigned int i, j;
3260  int64_t max_time = 0;
3261 
3262  if (s->duration > 0 && s->start_time < INT64_MAX - s->duration)
3263  max_time = s->duration +
3264  ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
3265 
3266  for (i = 0; i < s->nb_chapters; i++)
3267  if (s->chapters[i]->end == AV_NOPTS_VALUE) {
3268  AVChapter *ch = s->chapters[i];
3269  int64_t end = max_time ? av_rescale_q(max_time, AV_TIME_BASE_Q,
3270  ch->time_base)
3271  : INT64_MAX;
3272 
3273  for (j = 0; j < s->nb_chapters; j++) {
3274  AVChapter *ch1 = s->chapters[j];
3275  int64_t next_start = av_rescale_q(ch1->start, ch1->time_base,
3276  ch->time_base);
3277  if (j != i && next_start > ch->start && next_start < end)
3278  end = next_start;
3279  }
3280  ch->end = (end == INT64_MAX || end < ch->start) ? ch->start : end;
3281  }
3282 }
3283 
3284 static int get_std_framerate(int i)
3285 {
3286  if (i < 30*12)
3287  return (i + 1) * 1001;
3288  i -= 30*12;
3289 
3290  if (i < 30)
3291  return (i + 31) * 1001 * 12;
3292  i -= 30;
3293 
3294  if (i < 3)
3295  return ((const int[]) { 80, 120, 240})[i] * 1001 * 12;
3296 
3297  i -= 3;
3298 
3299  return ((const int[]) { 24, 30, 60, 12, 15, 48 })[i] * 1000 * 12;
3300 }
3301 
3302 /* Is the time base unreliable?
3303  * This is a heuristic to balance between quick acceptance of the values in
3304  * the headers vs. some extra checks.
3305  * Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
3306  * MPEG-2 commonly misuses field repeat flags to store different framerates.
3307  * And there are "variable" fps files this needs to detect as well. */
3309 {
3310  if (c->time_base.den >= 101LL * c->time_base.num ||
3311  c->time_base.den < 5LL * c->time_base.num ||
3312  // c->codec_tag == AV_RL32("DIVX") ||
3313  // c->codec_tag == AV_RL32("XVID") ||
3314  c->codec_tag == AV_RL32("mp4v") ||
3316  c->codec_id == AV_CODEC_ID_GIF ||
3317  c->codec_id == AV_CODEC_ID_HEVC ||
3318  c->codec_id == AV_CODEC_ID_H264)
3319  return 1;
3320  return 0;
3321 }
3322 
3324 {
3325  av_freep(&par->extradata);
3326  par->extradata_size = 0;
3327 
3329  return AVERROR(EINVAL);
3330 
3332  if (!par->extradata)
3333  return AVERROR(ENOMEM);
3334 
3335  memset(par->extradata + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3336  par->extradata_size = size;
3337 
3338  return 0;
3339 }
3340 
3342 {
3343  int ret = ff_alloc_extradata(par, size);
3344  if (ret < 0)
3345  return ret;
3346  ret = avio_read(pb, par->extradata, size);
3347  if (ret != size) {
3348  av_freep(&par->extradata);
3349  par->extradata_size = 0;
3350  av_log(s, AV_LOG_ERROR, "Failed to read extradata of size %d\n", size);
3351  return ret < 0 ? ret : AVERROR_INVALIDDATA;
3352  }
3353 
3354  return ret;
3355 }
3356 
3357 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
3358 {
3359  int i, j;
3360  int64_t last = st->info->last_dts;
3361 
3362  if ( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
3363  && ts - (uint64_t)last < INT64_MAX) {
3364  double dts = (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
3365  int64_t duration = ts - last;
3366 
3367  if (!st->info->duration_error)
3368  st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
3369  if (!st->info->duration_error)
3370  return AVERROR(ENOMEM);
3371 
3372 // if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
3373 // av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
3374  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3375  if (st->info->duration_error[0][1][i] < 1e10) {
3376  int framerate = get_std_framerate(i);
3377  double sdts = dts*framerate/(1001*12);
3378  for (j= 0; j<2; j++) {
3379  int64_t ticks = llrint(sdts+j*0.5);
3380  double error= sdts - ticks + j*0.5;
3381  st->info->duration_error[j][0][i] += error;
3382  st->info->duration_error[j][1][i] += error*error;
3383  }
3384  }
3385  }
3386  if (st->info->rfps_duration_sum <= INT64_MAX - duration) {
3387  st->info->duration_count++;
3389  }
3390 
3391  if (st->info->duration_count % 10 == 0) {
3392  int n = st->info->duration_count;
3393  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3394  if (st->info->duration_error[0][1][i] < 1e10) {
3395  double a0 = st->info->duration_error[0][0][i] / n;
3396  double error0 = st->info->duration_error[0][1][i] / n - a0*a0;
3397  double a1 = st->info->duration_error[1][0][i] / n;
3398  double error1 = st->info->duration_error[1][1][i] / n - a1*a1;
3399  if (error0 > 0.04 && error1 > 0.04) {
3400  st->info->duration_error[0][1][i] = 2e10;
3401  st->info->duration_error[1][1][i] = 2e10;
3402  }
3403  }
3404  }
3405  }
3406 
3407  // ignore the first 4 values, they might have some random jitter
3408  if (st->info->duration_count > 3 && is_relative(ts) == is_relative(last))
3409  st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
3410  }
3411  if (ts != AV_NOPTS_VALUE)
3412  st->info->last_dts = ts;
3413 
3414  return 0;
3415 }
3416 
3418 {
3419  int i, j;
3420 
3421  for (i = 0; i < ic->nb_streams; i++) {
3422  AVStream *st = ic->streams[i];
3423 
3425  continue;
3426  // the check for tb_unreliable() is not completely correct, since this is not about handling
3427  // an unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
3428  // ipmovie.c produces.
3429  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)
3430  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);
3431  if (st->info->duration_count>1 && !st->r_frame_rate.num
3432  && tb_unreliable(st->internal->avctx)) {
3433  int num = 0;
3434  double best_error= 0.01;
3435  AVRational ref_rate = st->r_frame_rate.num ? st->r_frame_rate : av_inv_q(st->time_base);
3436 
3437  for (j= 0; j<MAX_STD_TIMEBASES; j++) {
3438  int k;
3439 
3440  if (st->info->codec_info_duration &&
3441  st->info->codec_info_duration*av_q2d(st->time_base) < (1001*11.5)/get_std_framerate(j))
3442  continue;
3443  if (!st->info->codec_info_duration && get_std_framerate(j) < 1001*12)
3444  continue;
3445 
3446  if (av_q2d(st->time_base) * st->info->rfps_duration_sum / st->info->duration_count < (1001*12.0 * 0.8)/get_std_framerate(j))
3447  continue;
3448 
3449  for (k= 0; k<2; k++) {
3450  int n = st->info->duration_count;
3451  double a= st->info->duration_error[k][0][j] / n;
3452  double error= st->info->duration_error[k][1][j]/n - a*a;
3453 
3454  if (error < best_error && best_error> 0.000000001) {
3455  best_error= error;
3456  num = get_std_framerate(j);
3457  }
3458  if (error < 0.02)
3459  av_log(ic, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
3460  }
3461  }
3462  // do not increase frame rate by more than 1 % in order to match a standard rate.
3463  if (num && (!ref_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(ref_rate)))
3464  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
3465  }
3466  if ( !st->avg_frame_rate.num
3467  && st->r_frame_rate.num && st->info->rfps_duration_sum
3468  && st->info->codec_info_duration <= 0
3469  && st->info->duration_count > 2
3470  && 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
3471  ) {
3472  av_log(ic, AV_LOG_DEBUG, "Setting avg frame rate based on r frame rate\n");
3473  st->avg_frame_rate = st->r_frame_rate;
3474  }
3475 
3476  av_freep(&st->info->duration_error);
3477  st->info->last_dts = AV_NOPTS_VALUE;
3478  st->info->duration_count = 0;
3479  st->info->rfps_duration_sum = 0;
3480  }
3481 }
3482 
3484 {
3485  const AVBitStreamFilter *f;
3486 
3487  f = av_bsf_get_by_name("extract_extradata");
3488  if (!f)
3489  return 0;
3490 
3491  if (f->codec_ids) {
3492  const enum AVCodecID *ids;
3493  for (ids = f->codec_ids; *ids != AV_CODEC_ID_NONE; ids++)
3494  if (*ids == st->codecpar->codec_id)
3495  return 1;
3496  }
3497 
3498  return 0;
3499 }
3500 
3502 {
3503  AVStreamInternal *sti = st->internal;
3504  const AVBitStreamFilter *f;
3505  int ret;
3506 
3507  f = av_bsf_get_by_name("extract_extradata");
3508  if (!f)
3509  goto finish;
3510 
3511  /* check that the codec id is supported */
3512  ret = extract_extradata_check(st);
3513  if (!ret)
3514  goto finish;
3515 
3517  if (!sti->extract_extradata.pkt)
3518  return AVERROR(ENOMEM);
3519 
3520  ret = av_bsf_alloc(f, &sti->extract_extradata.bsf);
3521  if (ret < 0)
3522  goto fail;
3523 
3525  st->codecpar);
3526  if (ret < 0)
3527  goto fail;
3528 
3530 
3531  ret = av_bsf_init(sti->extract_extradata.bsf);
3532  if (ret < 0)
3533  goto fail;
3534 
3535 finish:
3536  sti->extract_extradata.inited = 1;
3537 
3538  return 0;
3539 fail:
3542  return ret;
3543 }
3544 
3545 static int extract_extradata(AVStream *st, const AVPacket *pkt)
3546 {
3547  AVStreamInternal *sti = st->internal;
3548  AVPacket *pkt_ref;
3549  int ret;
3550 
3551  if (!sti->extract_extradata.inited) {
3552  ret = extract_extradata_init(st);
3553  if (ret < 0)
3554  return ret;
3555  }
3556 
3557  if (sti->extract_extradata.inited && !sti->extract_extradata.bsf)
3558  return 0;
3559 
3560  pkt_ref = sti->extract_extradata.pkt;
3561  ret = av_packet_ref(pkt_ref, pkt);
3562  if (ret < 0)
3563  return ret;
3564 
3565  ret = av_bsf_send_packet(sti->extract_extradata.bsf, pkt_ref);
3566  if (ret < 0) {
3567  av_packet_unref(pkt_ref);
3568  return ret;
3569  }
3570 
3571  while (ret >= 0 && !sti->avctx->extradata) {
3572  int extradata_size;
3573  uint8_t *extradata;
3574 
3575  ret = av_bsf_receive_packet(sti->extract_extradata.bsf, pkt_ref);
3576  if (ret < 0) {
3577  if (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3578  return ret;
3579  continue;
3580  }
3581 
3583  &extradata_size);
3584 
3585  if (extradata) {
3586  av_assert0(!sti->avctx->extradata);
3587  if ((unsigned)extradata_size < FF_MAX_EXTRADATA_SIZE)
3588  sti->avctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
3589  if (!sti->avctx->extradata) {
3590  av_packet_unref(pkt_ref);
3591  return AVERROR(ENOMEM);
3592  }
3593  memcpy(sti->avctx->extradata, extradata, extradata_size);
3594  sti->avctx->extradata_size = extradata_size;
3595  }
3596  av_packet_unref(pkt_ref);
3597  }
3598 
3599  return 0;
3600 }
3601 
3603 {
3604  int i;
3605 
3606  for (i = 0; i < avctx->nb_coded_side_data; i++) {
3607  const AVPacketSideData *sd_src = &avctx->coded_side_data[i];
3608  uint8_t *dst_data;
3609  dst_data = av_stream_new_side_data(st, sd_src->type, sd_src->size);
3610  if (!dst_data)
3611  return AVERROR(ENOMEM);
3612  memcpy(dst_data, sd_src->data, sd_src->size);
3613  }
3614  return 0;
3615 }
3616 
3618 {
3619  int i, count = 0, ret = 0, j;
3620  int64_t read_size;
3621  AVStream *st;
3622  AVCodecContext *avctx;
3623  AVPacket pkt1;
3624  int64_t old_offset = avio_tell(ic->pb);
3625  // new streams might appear, no options for those
3626  int orig_nb_streams = ic->nb_streams;
3627  int flush_codecs;
3628  int64_t max_analyze_duration = ic->max_analyze_duration;
3629  int64_t max_stream_analyze_duration;
3630  int64_t max_subtitle_analyze_duration;
3631  int64_t probesize = ic->probesize;
3632  int eof_reached = 0;
3633  int *missing_streams = av_opt_ptr(ic->iformat->priv_class, ic->priv_data, "missing_streams");
3634 
3635  flush_codecs = probesize > 0;
3636 
3637  av_opt_set(ic, "skip_clear", "1", AV_OPT_SEARCH_CHILDREN);
3638 
3639  max_stream_analyze_duration = max_analyze_duration;
3640  max_subtitle_analyze_duration = max_analyze_duration;
3641  if (!max_analyze_duration) {
3642  max_stream_analyze_duration =
3643  max_analyze_duration = 5*AV_TIME_BASE;
3644  max_subtitle_analyze_duration = 30*AV_TIME_BASE;
3645  if (!strcmp(ic->iformat->name, "flv"))
3646  max_stream_analyze_duration = 90*AV_TIME_BASE;
3647  if (!strcmp(ic->iformat->name, "mpeg") || !strcmp(ic->iformat->name, "mpegts"))
3648  max_stream_analyze_duration = 7*AV_TIME_BASE;
3649  }
3650 
3651  if (ic->pb)
3652  av_log(ic, AV_LOG_DEBUG, "Before avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d nb_streams:%d\n",
3653  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, ic->nb_streams);
3654 
3655  for (i = 0; i < ic->nb_streams; i++) {
3656  const AVCodec *codec;
3657  AVDictionary *thread_opt = NULL;
3658  st = ic->streams[i];
3659  avctx = st->internal->avctx;
3660 
3661  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
3663 /* if (!st->time_base.num)
3664  st->time_base = */
3665  if (!avctx->time_base.num)
3666  avctx->time_base = st->time_base;
3667  }
3668 
3669  /* check if the caller has overridden the codec id */
3670 #if FF_API_LAVF_AVCTX
3672  if (st->codec->codec_id != st->internal->orig_codec_id) {
3673  st->codecpar->codec_id = st->codec->codec_id;
3674  st->codecpar->codec_type = st->codec->codec_type;
3675  st->internal->orig_codec_id = st->codec->codec_id;
3676  }
3678 #endif
3679  // only for the split stuff
3680  if (!st->parser && !(ic->flags & AVFMT_FLAG_NOPARSE) && st->request_probe <= 0) {
3681  st->parser = av_parser_init(st->codecpar->codec_id);
3682  if (st->parser) {
3683  if (st->need_parsing == AVSTREAM_PARSE_HEADERS) {
3685  } else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW) {
3687  }
3688  } else if (st->need_parsing) {
3689  av_log(ic, AV_LOG_VERBOSE, "parser not found for codec "
3690  "%s, packets or times may be invalid.\n",
3692  }
3693  }
3694 
3695  if (st->codecpar->codec_id != st->internal->orig_codec_id)
3697 
3699  if (ret < 0)
3700  goto find_stream_info_err;
3701  if (st->request_probe <= 0)
3702  st->internal->avctx_inited = 1;
3703 
3704  codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3705 
3706  /* Force thread count to 1 since the H.264 decoder will not extract
3707  * SPS and PPS to extradata during multi-threaded decoding. */
3708  av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
3709 
3710  if (ic->codec_whitelist)
3711  av_dict_set(options ? &options[i] : &thread_opt, "codec_whitelist", ic->codec_whitelist, 0);
3712 
3713  /* Ensure that subtitle_header is properly set. */
3715  && codec && !avctx->codec) {
3716  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3717  av_log(ic, AV_LOG_WARNING,
3718  "Failed to open codec in %s\n",__FUNCTION__);
3719  }
3720 
3721  // Try to just open decoders, in case this is enough to get parameters.
3722  if (!has_codec_parameters(st, NULL) && st->request_probe <= 0) {
3723  if (codec && !avctx->codec)
3724  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3725  av_log(ic, AV_LOG_WARNING,
3726  "Failed to open codec in %s\n",__FUNCTION__);
3727  }
3728  if (!options)
3729  av_dict_free(&thread_opt);
3730  }
3731 
3732  for (i = 0; i < ic->nb_streams; i++) {
3733 #if FF_API_R_FRAME_RATE
3735 #endif
3738  }
3739 
3740  read_size = 0;
3741  for (;;) {
3742  const AVPacket *pkt;
3743  int analyzed_all_streams;
3745  ret = AVERROR_EXIT;
3746  av_log(ic, AV_LOG_DEBUG, "interrupted\n");
3747  break;
3748  }
3749 
3750  /* check if one codec still needs to be handled */
3751  for (i = 0; i < ic->nb_streams; i++) {
3752  int fps_analyze_framecount = 20;
3753  int count;
3754 
3755  st = ic->streams[i];
3756  if (!has_codec_parameters(st, NULL))
3757  break;
3758  /* If the timebase is coarse (like the usual millisecond precision
3759  * of mkv), we need to analyze more frames to reliably arrive at
3760  * the correct fps. */
3761  if (av_q2d(st->time_base) > 0.0005)
3762  fps_analyze_framecount *= 2;
3763  if (!tb_unreliable(st->internal->avctx))
3764  fps_analyze_framecount = 0;
3765  if (ic->fps_probe_size >= 0)
3766  fps_analyze_framecount = ic->fps_probe_size;
3768  fps_analyze_framecount = 0;
3769  /* variable fps and no guess at the real fps */
3770  count = (ic->iformat->flags & AVFMT_NOTIMESTAMPS) ?
3772  st->info->duration_count;
3773  if (!(st->r_frame_rate.num && st->avg_frame_rate.num) &&
3775  if (count < fps_analyze_framecount)
3776  break;
3777  }
3778  // Look at the first 3 frames if there is evidence of frame delay
3779  // but the decoder delay is not set.
3780  if (st->info->frame_delay_evidence && count < 2 && st->internal->avctx->has_b_frames == 0)
3781  break;
3782  if (!st->internal->avctx->extradata &&
3784  st->internal->extract_extradata.bsf) &&
3786  break;
3787  if (st->first_dts == AV_NOPTS_VALUE &&
3788  !(ic->iformat->flags & AVFMT_NOTIMESTAMPS) &&
3792  break;
3793  }
3794  analyzed_all_streams = 0;
3795  if (!missing_streams || !*missing_streams)
3796  if (i == ic->nb_streams) {
3797  analyzed_all_streams = 1;
3798  /* NOTE: If the format has no header, then we need to read some
3799  * packets to get most of the streams, so we cannot stop here. */
3800  if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
3801  /* If we found the info for all the codecs, we can stop. */
3802  ret = count;
3803  av_log(ic, AV_LOG_DEBUG, "All info found\n");
3804  flush_codecs = 0;
3805  break;
3806  }
3807  }
3808  /* We did not get all the codec info, but we read too much data. */
3809  if (read_size >= probesize) {
3810  ret = count;
3811  av_log(ic, AV_LOG_DEBUG,
3812  "Probe buffer size limit of %"PRId64" bytes reached\n", probesize);
3813  for (i = 0; i < ic->nb_streams; i++)
3814  if (!ic->streams[i]->r_frame_rate.num &&
3815  ic->streams[i]->info->duration_count <= 1 &&
3817  strcmp(ic->iformat->name, "image2"))
3818  av_log(ic, AV_LOG_WARNING,
3819  "Stream #%d: not enough frames to estimate rate; "
3820  "consider increasing probesize\n", i);
3821  break;
3822  }
3823 
3824  /* NOTE: A new stream can be added there if no header in file
3825  * (AVFMTCTX_NOHEADER). */
3826  ret = read_frame_internal(ic, &pkt1);
3827  if (ret == AVERROR(EAGAIN))
3828  continue;
3829 
3830  if (ret < 0) {
3831  /* EOF or error*/
3832  eof_reached = 1;
3833  break;
3834  }
3835 
3836  if (!(ic->flags & AVFMT_FLAG_NOBUFFER)) {
3839  &pkt1, 0);
3840  if (ret < 0)
3841  goto unref_then_goto_end;
3842 
3843  pkt = &ic->internal->packet_buffer_end->pkt;
3844  } else {
3845  pkt = &pkt1;
3846  }
3847 
3848  st = ic->streams[pkt->stream_index];
3850  read_size += pkt->size;
3851 
3852  avctx = st->internal->avctx;
3853  if (!st->internal->avctx_inited) {
3855  if (ret < 0)
3856  goto unref_then_goto_end;
3857  st->internal->avctx_inited = 1;
3858  }
3859 
3860  if (pkt->dts != AV_NOPTS_VALUE && st->codec_info_nb_frames > 1) {
3861  /* check for non-increasing dts */
3862  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3863  st->info->fps_last_dts >= pkt->dts) {
3864  av_log(ic, AV_LOG_DEBUG,
3865  "Non-increasing DTS in stream %d: packet %d with DTS "
3866  "%"PRId64", packet %d with DTS %"PRId64"\n",
3867  st->index, st->info->fps_last_dts_idx,
3869  pkt->dts);
3870  st->info->fps_first_dts =
3872  }
3873  /* Check for a discontinuity in dts. If the difference in dts
3874  * is more than 1000 times the average packet duration in the
3875  * sequence, we treat it as a discontinuity. */
3876  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3878  (pkt->dts - (uint64_t)st->info->fps_last_dts) / 1000 >
3879  (st->info->fps_last_dts - (uint64_t)st->info->fps_first_dts) /
3880  (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
3881  av_log(ic, AV_LOG_WARNING,
3882  "DTS discontinuity in stream %d: packet %d with DTS "
3883  "%"PRId64", packet %d with DTS %"PRId64"\n",
3884  st->index, st->info->fps_last_dts_idx,
3886  pkt->dts);
3887  st->info->fps_first_dts =
3889  }
3890 
3891  /* update stored dts values */
3892  if (st->info->fps_first_dts == AV_NOPTS_VALUE) {
3893  st->info->fps_first_dts = pkt->dts;
3895  }
3896  st->info->fps_last_dts = pkt->dts;
3898  }
3899  if (st->codec_info_nb_frames>1) {
3900  int64_t t = 0;
3901  int64_t limit;
3902 
3903  if (st->time_base.den > 0)
3905  if (st->avg_frame_rate.num > 0)
3907 
3908  if ( t == 0
3909  && st->codec_info_nb_frames>30
3910  && st->info->fps_first_dts != AV_NOPTS_VALUE
3911  && st->info->fps_last_dts != AV_NOPTS_VALUE)
3913 
3914  if (analyzed_all_streams) limit = max_analyze_duration;
3915  else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) limit = max_subtitle_analyze_duration;
3916  else limit = max_stream_analyze_duration;
3917 
3918  if (t >= limit) {
3919  av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds st:%d\n",
3920  limit,
3921  t, pkt->stream_index);
3922  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3923  av_packet_unref(&pkt1);
3924  break;
3925  }
3926  if (pkt->duration) {
3927  if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE && pkt->pts != AV_NOPTS_VALUE && st->start_time != AV_NOPTS_VALUE && pkt->pts >= st->start_time) {
3928  st->info->codec_info_duration = FFMIN(pkt->pts - st->start_time, st->info->codec_info_duration + pkt->duration);
3929  } else
3930  st->info->codec_info_duration += pkt->duration;
3931  st->info->codec_info_duration_fields += st->parser && st->need_parsing && avctx->ticks_per_frame ==2 ? st->parser->repeat_pict + 1 : 2;
3932  }
3933  }
3934  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
3935 #if FF_API_R_FRAME_RATE
3936  ff_rfps_add_frame(ic, st, pkt->dts);
3937 #endif
3938  if (pkt->dts != pkt->pts && pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE)
3939  st->info->frame_delay_evidence = 1;
3940  }
3941  if (!st->internal->avctx->extradata) {
3942  ret = extract_extradata(st, pkt);
3943  if (ret < 0)
3944  goto unref_then_goto_end;
3945  }
3946 
3947  /* If still no information, we try to open the codec and to
3948  * decompress the frame. We try to avoid that in most cases as
3949  * it takes longer and uses more memory. For MPEG-4, we need to
3950  * decompress for QuickTime.
3951  *
3952  * If AV_CODEC_CAP_CHANNEL_CONF is set this will force decoding of at
3953  * least one frame of codec data, this makes sure the codec initializes
3954  * the channel configuration and does not only trust the values from
3955  * the container. */
3956  try_decode_frame(ic, st, pkt,
3957  (options && i < orig_nb_streams) ? &options[i] : NULL);
3958 
3959  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3960  av_packet_unref(&pkt1);
3961 
3962  st->codec_info_nb_frames++;
3963  count++;
3964  }
3965 
3966  if (eof_reached) {
3967  int stream_index;
3968  for (stream_index = 0; stream_index < ic->nb_streams; stream_index++) {
3969  st = ic->streams[stream_index];
3970  avctx = st->internal->avctx;
3971  if (!has_codec_parameters(st, NULL)) {
3972  const AVCodec *codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3973  if (codec && !avctx->codec) {
3974  AVDictionary *opts = NULL;
3975  if (ic->codec_whitelist)
3976  av_dict_set(&opts, "codec_whitelist", ic->codec_whitelist, 0);
3977  if (avcodec_open2(avctx, codec, (options && stream_index < orig_nb_streams) ? &options[stream_index] : &opts) < 0)
3978  av_log(ic, AV_LOG_WARNING,
3979  "Failed to open codec in %s\n",__FUNCTION__);
3980  av_dict_free(&opts);
3981  }
3982  }
3983 
3984  // EOF already reached while reading the stream above.
3985  // So continue with reoordering DTS with whatever delay we have.
3987  update_dts_from_pts(ic, stream_index, ic->internal->packet_buffer);
3988  }
3989  }
3990  }
3991 
3992  if (flush_codecs) {
3993  AVPacket empty_pkt = { 0 };
3994  int err = 0;
3995  av_init_packet(&empty_pkt);
3996 
3997  for (i = 0; i < ic->nb_streams; i++) {
3998 
3999  st = ic->streams[i];
4000 
4001  /* flush the decoders */
4002  if (st->info->found_decoder == 1) {
4003  do {
4004  err = try_decode_frame(ic, st, &empty_pkt,
4005  (options && i < orig_nb_streams)
4006  ? &options[i] : NULL);
4007  } while (err > 0 && !has_codec_parameters(st, NULL));
4008 
4009  if (err < 0) {
4010  av_log(ic, AV_LOG_INFO,
4011  "decoding for stream %d failed\n", st->index);
4012  }
4013  }
4014  }
4015  }
4016 
4017  ff_rfps_calculate(ic);
4018 
4019  for (i = 0; i < ic->nb_streams; i++) {
4020  st = ic->streams[i];
4021  avctx = st->internal->avctx;
4022  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
4023  if (avctx->codec_id == AV_CODEC_ID_RAWVIDEO && !avctx->codec_tag && !avctx->bits_per_coded_sample) {
4024  uint32_t tag= avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
4026  avctx->codec_tag= tag;
4027  }
4028 
4029  /* estimate average framerate if not set by demuxer */
4030  if (st->info->codec_info_duration_fields &&
4031  !st->avg_frame_rate.num &&
4032  st->info->codec_info_duration) {
4033  int best_fps = 0;
4034  double best_error = 0.01;
4035  AVRational codec_frame_rate = avctx->framerate;
4036 
4037  if (st->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
4038  st->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
4039  st->info->codec_info_duration < 0)
4040  continue;
4042  st->info->codec_info_duration_fields * (int64_t) st->time_base.den,
4043  st->info->codec_info_duration * 2 * (int64_t) st->time_base.num, 60000);
4044 
4045  /* Round guessed framerate to a "standard" framerate if it's
4046  * within 1% of the original estimate. */
4047  for (j = 0; j < MAX_STD_TIMEBASES; j++) {
4048  AVRational std_fps = { get_std_framerate(j), 12 * 1001 };
4049  double error = fabs(av_q2d(st->avg_frame_rate) /
4050  av_q2d(std_fps) - 1);
4051 
4052  if (error < best_error) {
4053  best_error = error;
4054  best_fps = std_fps.num;
4055  }
4056 
4057  if (ic->internal->prefer_codec_framerate && codec_frame_rate.num > 0 && codec_frame_rate.den > 0) {
4058  error = fabs(av_q2d(codec_frame_rate) /
4059  av_q2d(std_fps) - 1);
4060  if (error < best_error) {
4061  best_error = error;
4062  best_fps = std_fps.num;
4063  }
4064  }
4065  }
4066  if (best_fps)
4068  best_fps, 12 * 1001, INT_MAX);
4069  }
4070 
4071  if (!st->r_frame_rate.num) {
4072  if ( avctx->time_base.den * (int64_t) st->time_base.num
4073  <= avctx->time_base.num * avctx->ticks_per_frame * (uint64_t) st->time_base.den) {
4075  avctx->time_base.den, (int64_t)avctx->time_base.num * avctx->ticks_per_frame, INT_MAX);
4076  } else {
4077  st->r_frame_rate.num = st->time_base.den;
4078  st->r_frame_rate.den = st->time_base.num;
4079  }
4080  }
4082  AVRational hw_ratio = { avctx->height, avctx->width };
4084  hw_ratio);
4085  }
4086  } else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
4087  if (!avctx->bits_per_coded_sample)
4088  avctx->bits_per_coded_sample =
4090  // set stream disposition based on audio service type
4091  switch (avctx->audio_service_type) {
4094  break;
4097  break;
4100  break;
4103  break;
4106  break;
4107  }
4108  }
4109  }
4110 
4111  if (probesize)
4112  estimate_timings(ic, old_offset);
4113 
4114  av_opt_set(ic, "skip_clear", "0", AV_OPT_SEARCH_CHILDREN);
4115 
4116  if (ret >= 0 && ic->nb_streams)
4117  /* We could not have all the codec parameters before EOF. */
4118  ret = -1;
4119  for (i = 0; i < ic->nb_streams; i++) {
4120  const char *errmsg;
4121  st = ic->streams[i];
4122 
4123  /* if no packet was ever seen, update context now for has_codec_parameters */
4124  if (!st->internal->avctx_inited) {
4125  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
4127  st->codecpar->format = st->internal->avctx->sample_fmt;
4129  if (ret < 0)
4130  goto find_stream_info_err;
4131  }
4132  if (!has_codec_parameters(st, &errmsg)) {
4133  char buf[256];
4134  avcodec_string(buf, sizeof(buf), st->internal->avctx, 0);
4135  av_log(ic, AV_LOG_WARNING,
4136  "Could not find codec parameters for stream %d (%s): %s\n"
4137  "Consider increasing the value for the 'analyzeduration' and 'probesize' options\n",
4138  i, buf, errmsg);
4139  } else {
4140  ret = 0;
4141  }
4142  }
4143 
4145 
4146  /* update the stream parameters from the internal codec contexts */
4147  for (i = 0; i < ic->nb_streams; i++) {
4148  st = ic->streams[i];
4149 
4150  if (st->internal->avctx_inited) {
4151  int orig_w = st->codecpar->width;
4152  int orig_h = st->codecpar->height;
4154  if (ret < 0)
4155  goto find_stream_info_err;
4156  ret = add_coded_side_data(st, st->internal->avctx);
4157  if (ret < 0)
4158  goto find_stream_info_err;
4159 #if FF_API_LOWRES
4160  // The decoder might reduce the video size by the lowres factor.
4161  if (st->internal->avctx->lowres && orig_w) {
4162  st->codecpar->width = orig_w;
4163  st->codecpar->height = orig_h;
4164  }
4165 #endif
4166  }
4167 
4168 #if FF_API_LAVF_AVCTX
4170  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
4171  if (ret < 0)
4172  goto find_stream_info_err;
4173 
4174 #if FF_API_LOWRES
4175  // The old API (AVStream.codec) "requires" the resolution to be adjusted
4176  // by the lowres factor.
4177  if (st->internal->avctx->lowres && st->internal->avctx->width) {
4178  st->codec->lowres = st->internal->avctx->lowres;
4179  st->codec->width = st->internal->avctx->width;
4180  st->codec->height = st->internal->avctx->height;
4181  }
4182 #endif
4183 
4184  if (st->codec->codec_tag != MKTAG('t','m','c','d')) {
4185  st->codec->time_base = st->internal->avctx->time_base;
4186  st->codec->ticks_per_frame = st->internal->avctx->ticks_per_frame;
4187  }
4188  st->codec->framerate = st->avg_frame_rate;
4189 
4190  if (st->internal->avctx->subtitle_header) {
4191  st->codec->subtitle_header = av_malloc(st->internal->avctx->subtitle_header_size);
4192  if (!st->codec->subtitle_header)
4193  goto find_stream_info_err;
4194  st->codec->subtitle_header_size = st->internal->avctx->subtitle_header_size;
4195  memcpy(st->codec->subtitle_header, st->internal->avctx->subtitle_header,
4196  st->codec->subtitle_header_size);
4197  }
4198 
4199  // Fields unavailable in AVCodecParameters
4200  st->codec->coded_width = st->internal->avctx->coded_width;
4201  st->codec->coded_height = st->internal->avctx->coded_height;
4202  st->codec->properties = st->internal->avctx->properties;
4204 #endif
4205 
4206  st->internal->avctx_inited = 0;
4207  }
4208 
4209 find_stream_info_err:
4210  for (i = 0; i < ic->nb_streams; i++) {
4211  st = ic->streams[i];
4212  if (st->info)
4213  av_freep(&st->info->duration_error);
4214  avcodec_close(ic->streams[i]->internal->avctx);
4215  av_freep(&ic->streams[i]->info);
4218  }
4219  if (ic->pb)
4220  av_log(ic, AV_LOG_DEBUG, "After avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d frames:%d\n",
4221  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, count);
4222  return ret;
4223 
4224 unref_then_goto_end:
4225  av_packet_unref(&pkt1);
4226  goto find_stream_info_err;
4227 }
4228 
4230 {
4231  int i, j;
4232 
4233  for (i = 0; i < ic->nb_programs; i++) {
4234  if (ic->programs[i] == last) {
4235  last = NULL;
4236  } else {
4237  if (!last)
4238  for (j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
4239  if (ic->programs[i]->stream_index[j] == s)
4240  return ic->programs[i];
4241  }
4242  }
4243  return NULL;
4244 }
4245 
4247  int wanted_stream_nb, int related_stream,
4248  AVCodec **decoder_ret, int flags)
4249 {
4250  int i, nb_streams = ic->nb_streams;
4252  int best_count = -1, best_multiframe = -1, best_disposition = -1;
4253  int count, multiframe, disposition;
4254  int64_t best_bitrate = -1;
4255  int64_t bitrate;
4256  unsigned *program = NULL;
4257  const AVCodec *decoder = NULL, *best_decoder = NULL;
4258 
4259  if (related_stream >= 0 && wanted_stream_nb < 0) {
4260  AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
4261  if (p) {
4262  program = p->stream_index;
4263  nb_streams = p->nb_stream_indexes;
4264  }
4265  }
4266  for (i = 0; i < nb_streams; i++) {
4267  int real_stream_index = program ? program[i] : i;
4268  AVStream *st = ic->streams[real_stream_index];
4269  AVCodecParameters *par = st->codecpar;
4270  if (par->codec_type != type)
4271  continue;
4272  if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
4273  continue;
4274  if (type == AVMEDIA_TYPE_AUDIO && !(par->channels && par->sample_rate))
4275  continue;
4276  if (decoder_ret) {
4277  decoder = find_decoder(ic, st, par->codec_id);
4278  if (!decoder) {
4279  if (ret < 0)
4281  continue;
4282  }
4283  }
4285  + !! (st->disposition & AV_DISPOSITION_DEFAULT);
4286  count = st->codec_info_nb_frames;
4287  bitrate = par->bit_rate;
4288  multiframe = FFMIN(5, count);
4289  if ((best_disposition > disposition) ||
4290  (best_disposition == disposition && best_multiframe > multiframe) ||
4291  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate > bitrate) ||
4292  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
4293  continue;
4294  best_disposition = disposition;
4295  best_count = count;
4296  best_bitrate = bitrate;
4297  best_multiframe = multiframe;
4298  ret = real_stream_index;
4299  best_decoder = decoder;
4300  if (program && i == nb_streams - 1 && ret < 0) {
4301  program = NULL;
4302  nb_streams = ic->nb_streams;
4303  /* no related stream found, try again with everything */
4304  i = 0;
4305  }
4306  }
4307  if (decoder_ret)
4308  *decoder_ret = (AVCodec*)best_decoder;
4309  return ret;
4310 }
4311 
4312 /*******************************************************/
4313 
4315 {
4316  if (s->iformat->read_play)
4317  return s->iformat->read_play(s);
4318  if (s->pb)
4319  return avio_pause(s->pb, 0);
4320  return AVERROR(ENOSYS);
4321 }
4322 
4324 {
4325  if (s->iformat->read_pause)
4326  return s->iformat->read_pause(s);
4327  if (s->pb)
4328  return avio_pause(s->pb, 1);
4329  return AVERROR(ENOSYS);
4330 }
4331 
4333 {
4334  int ret, i;
4335 
4336  dst->id = src->id;
4337  dst->time_base = src->time_base;
4338  dst->nb_frames = src->nb_frames;
4339  dst->disposition = src->disposition;
4341  dst->avg_frame_rate = src->avg_frame_rate;
4342  dst->r_frame_rate = src->r_frame_rate;
4343 
4344  av_dict_free(&dst->metadata);
4345  ret = av_dict_copy(&dst->metadata, src->metadata, 0);
4346  if (ret < 0)
4347  return ret;
4348 
4349  ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
4350  if (ret < 0)
4351  return ret;
4352 
4353  /* Free existing side data*/
4354  for (i = 0; i < dst->nb_side_data; i++)
4355  av_free(dst->side_data[i].data);
4356  av_freep(&dst->side_data);
4357  dst->nb_side_data = 0;
4358 
4359  /* Copy side data if present */
4360  if (src->nb_side_data) {
4362  sizeof(AVPacketSideData));
4363  if (!dst->side_data)
4364  return AVERROR(ENOMEM);
4365  dst->nb_side_data = src->nb_side_data;
4366 
4367  for (i = 0; i < src->nb_side_data; i++) {
4368  uint8_t *data = av_memdup(src->side_data[i].data,
4369  src->side_data[i].size);
4370  if (!data)
4371  return AVERROR(ENOMEM);
4372  dst->side_data[i].type = src->side_data[i].type;
4373  dst->side_data[i].size = src->side_data[i].size;
4374  dst->side_data[i].data = data;
4375  }
4376  }
4377 
4378 #if FF_API_LAVF_FFSERVER
4380  av_freep(&dst->recommended_encoder_configuration);
4381  if (src->recommended_encoder_configuration) {
4382  const char *conf_str = src->recommended_encoder_configuration;
4383  dst->recommended_encoder_configuration = av_strdup(conf_str);
4384  if (!dst->recommended_encoder_configuration)
4385  return AVERROR(ENOMEM);
4386  }
4388 #endif
4389 
4390  return 0;
4391 }
4392 
4393 static void free_stream(AVStream **pst)
4394 {
4395  AVStream *st = *pst;
4396  int i;
4397 
4398  if (!st)
4399  return;
4400 
4401  for (i = 0; i < st->nb_side_data; i++)
4402  av_freep(&st->side_data[i].data);
4403  av_freep(&st->side_data);
4404 
4405  if (st->parser)
4406  av_parser_close(st->parser);
4407 
4408  if (st->attached_pic.data)
4410 
4411  if (st->internal) {
4413  for (i = 0; i < st->internal->nb_bsfcs; i++) {
4414  av_bsf_free(&st->internal->bsfcs[i]);
4415  av_freep(&st->internal->bsfcs);
4416  }
4417  av_freep(&st->internal->priv_pts);
4420  }
4421  av_freep(&st->internal);
4422 
4423  av_dict_free(&st->metadata);
4425  av_freep(&st->probe_data.buf);
4426  av_freep(&st->index_entries);
4427 #if FF_API_LAVF_AVCTX
4429  avcodec_free_context(&st->codec);
4431 #endif
4432  av_freep(&st->priv_data);
4433  if (st->info)
4434  av_freep(&st->info->duration_error);
4435  av_freep(&st->info);
4436 #if FF_API_LAVF_FFSERVER
4438  av_freep(&st->recommended_encoder_configuration);
4440 #endif
4441 
4442  av_freep(pst);
4443 }
4444 
4446 {
4447  av_assert0(s->nb_streams>0);
4448  av_assert0(s->streams[ s->nb_streams - 1 ] == st);
4449 
4450  free_stream(&s->streams[ --s->nb_streams ]);
4451 }
4452 
4454 {
4455  int i;
4456 
4457  if (!s)
4458  return;
4459 
4460  if (s->oformat && s->oformat->deinit && s->internal->initialized)
4461  s->oformat->deinit(s);
4462 
4463  av_opt_free(s);
4464  if (s->iformat && s->iformat->priv_class && s->priv_data)
4465  av_opt_free(s->priv_data);
4466  if (s->oformat && s->oformat->priv_class && s->priv_data)
4467  av_opt_free(s->priv_data);
4468 
4469  for (i = 0; i < s->nb_streams; i++)
4470  free_stream(&s->streams[i]);
4471  s->nb_streams = 0;
4472 
4473  for (i = 0; i < s->nb_programs; i++) {
4474  av_dict_free(&s->programs[i]->metadata);
4475  av_freep(&s->programs[i]->stream_index);
4476  av_freep(&s->programs[i]);
4477  }
4478  s->nb_programs = 0;
4479 
4480  av_freep(&s->programs);
4481  av_freep(&s->priv_data);
4482  while (s->nb_chapters--) {
4484  av_freep(&s->chapters[s->nb_chapters]);
4485  }
4486  av_freep(&s->chapters);
4487  av_dict_free(&s->metadata);
4489  av_freep(&s->streams);
4490  flush_packet_queue(s);
4491  av_freep(&s->internal);
4492  av_freep(&s->url);
4493  av_free(s);
4494 }
4495 
4497 {
4498  AVFormatContext *s;
4499  AVIOContext *pb;
4500 
4501  if (!ps || !*ps)
4502  return;
4503 
4504  s = *ps;
4505  pb = s->pb;
4506 
4507  if ((s->iformat && strcmp(s->iformat->name, "image2") && s->iformat->flags & AVFMT_NOFILE) ||
4508  (s->flags & AVFMT_FLAG_CUSTOM_IO))
4509  pb = NULL;
4510 
4511  flush_packet_queue(s);
4512 
4513  if (s->iformat)
4514  if (s->iformat->read_close)
4515  s->iformat->read_close(s);
4516 
4518 
4519  *ps = NULL;
4520 
4521  avio_close(pb);
4522 }
4523 
4525 {
4526  AVStream *st;
4527  int i;
4528  AVStream **streams;
4529 
4530  if (s->nb_streams >= FFMIN(s->max_streams, INT_MAX/sizeof(*streams))) {
4531  if (s->max_streams < INT_MAX/sizeof(*streams))
4532  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);
4533  return NULL;
4534  }
4535  streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
4536  if (!streams)
4537  return NULL;
4538  s->streams = streams;
4539 
4540  st = av_mallocz(sizeof(AVStream));
4541  if (!st)
4542  return NULL;
4543  if (!(st->info = av_mallocz(sizeof(*st->info)))) {
4544  av_free(st);
4545  return NULL;
4546  }
4547  st->info->last_dts = AV_NOPTS_VALUE;
4548 
4549 #if FF_API_LAVF_AVCTX
4551  st->codec = avcodec_alloc_context3(c);
4552  if (!st->codec) {
4553  av_free(st->info);
4554  av_free(st);
4555  return NULL;
4556  }
4558 #endif
4559 
4560  st->internal = av_mallocz(sizeof(*st->internal));
4561  if (!st->internal)
4562  goto fail;
4563 
4565  if (!st->codecpar)
4566  goto fail;
4567 
4569  if (!st->internal->avctx)
4570  goto fail;
4571 
4572  if (s->iformat) {
4573 #if FF_API_LAVF_AVCTX
4575  /* no default bitrate if decoding */
4576  st->codec->bit_rate = 0;
4578 #endif
4579 
4580  /* default pts setting is MPEG-like */
4581  avpriv_set_pts_info(st, 33, 1, 90000);
4582  /* we set the current DTS to 0 so that formats without any timestamps
4583  * but durations get some timestamps, formats with some unknown
4584  * timestamps have their first few packets buffered and the
4585  * timestamps corrected before they are returned to the user */
4586  st->cur_dts = RELATIVE_TS_BASE;
4587  } else {
4588  st->cur_dts =