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  int level = AV_LOG_WARNING;
640  level = AV_LOG_ERROR;
641  av_log(s, level, "Discarding ID3 tags because more suitable tags were found.\n");
644  return AVERROR_INVALIDDATA;
645  }
646 
647  if (id3v2_extra_meta) {
648  if (!strcmp(s->iformat->name, "mp3") || !strcmp(s->iformat->name, "aac") ||
649  !strcmp(s->iformat->name, "tta") || !strcmp(s->iformat->name, "wav")) {
650  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0)
651  goto fail;
652  if ((ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0)
653  goto fail;
654  if ((ret = ff_id3v2_parse_priv(s, &id3v2_extra_meta)) < 0)
655  goto fail;
656  } else
657  av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
658  }
659  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
660 
661  if ((ret = avformat_queue_attached_pictures(s)) < 0)
662  goto fail;
663 
664  if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->pb && !s->internal->data_offset)
665  s->internal->data_offset = avio_tell(s->pb);
666 
668 
670 
671  for (i = 0; i < s->nb_streams; i++)
673 
674  if (options) {
675  av_dict_free(options);
676  *options = tmp;
677  }
678  *ps = s;
679  return 0;
680 
681 fail:
682  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
683  av_dict_free(&tmp);
684  if (s->pb && !(s->flags & AVFMT_FLAG_CUSTOM_IO))
685  avio_closep(&s->pb);
687  *ps = NULL;
688  return ret;
689 }
690 
691 /*******************************************************/
692 
694 {
695  switch (st->codecpar->codec_type) {
696  case AVMEDIA_TYPE_VIDEO:
697  if (s->video_codec_id)
698  st->codecpar->codec_id = s->video_codec_id;
699  break;
700  case AVMEDIA_TYPE_AUDIO:
701  if (s->audio_codec_id)
702  st->codecpar->codec_id = s->audio_codec_id;
703  break;
705  if (s->subtitle_codec_id)
707  break;
708  case AVMEDIA_TYPE_DATA:
709  if (s->data_codec_id)
710  st->codecpar->codec_id = s->data_codec_id;
711  break;
712  }
713 }
714 
715 static int probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
716 {
717  if (st->request_probe>0) {
718  AVProbeData *pd = &st->probe_data;
719  int end;
720  av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
721  --st->probe_packets;
722 
723  if (pkt) {
724  uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
725  if (!new_buf) {
727  "Failed to reallocate probe buffer for stream %d\n",
728  st->index);
729  goto no_packet;
730  }
731  pd->buf = new_buf;
732  memcpy(pd->buf + pd->buf_size, pkt->data, pkt->size);
733  pd->buf_size += pkt->size;
734  memset(pd->buf + pd->buf_size, 0, AVPROBE_PADDING_SIZE);
735  } else {
736 no_packet:
737  st->probe_packets = 0;
738  if (!pd->buf_size) {
740  "nothing to probe for stream %d\n", st->index);
741  }
742  }
743 
745  || st->probe_packets<= 0;
746 
747  if (end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)) {
748  int score = set_codec_from_probe_data(s, st, pd);
750  || end) {
751  pd->buf_size = 0;
752  av_freep(&pd->buf);
753  st->request_probe = -1;
754  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
755  av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
756  } else
757  av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
758  }
759  force_codec_ids(s, st);
760  }
761  }
762  return 0;
763 }
764 
765 static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
766 {
767  int64_t ref = pkt->dts;
768  int i, pts_wrap_behavior;
769  int64_t pts_wrap_reference;
770  AVProgram *first_program;
771 
772  if (ref == AV_NOPTS_VALUE)
773  ref = pkt->pts;
774  if (st->pts_wrap_reference != AV_NOPTS_VALUE || st->pts_wrap_bits >= 63 || ref == AV_NOPTS_VALUE || !s->correct_ts_overflow)
775  return 0;
776  ref &= (1LL << st->pts_wrap_bits)-1;
777 
778  // reference time stamp should be 60 s before first time stamp
779  pts_wrap_reference = ref - av_rescale(60, st->time_base.den, st->time_base.num);
780  // if first time stamp is not more than 1/8 and 60s before the wrap point, subtract rather than add wrap offset
781  pts_wrap_behavior = (ref < (1LL << st->pts_wrap_bits) - (1LL << st->pts_wrap_bits-3)) ||
782  (ref < (1LL << st->pts_wrap_bits) - av_rescale(60, st->time_base.den, st->time_base.num)) ?
784 
785  first_program = av_find_program_from_stream(s, NULL, stream_index);
786 
787  if (!first_program) {
788  int default_stream_index = av_find_default_stream_index(s);
789  if (s->streams[default_stream_index]->pts_wrap_reference == AV_NOPTS_VALUE) {
790  for (i = 0; i < s->nb_streams; i++) {
792  continue;
793  s->streams[i]->pts_wrap_reference = pts_wrap_reference;
794  s->streams[i]->pts_wrap_behavior = pts_wrap_behavior;
795  }
796  }
797  else {
798  st->pts_wrap_reference = s->streams[default_stream_index]->pts_wrap_reference;
799  st->pts_wrap_behavior = s->streams[default_stream_index]->pts_wrap_behavior;
800  }
801  }
802  else {
803  AVProgram *program = first_program;
804  while (program) {
805  if (program->pts_wrap_reference != AV_NOPTS_VALUE) {
806  pts_wrap_reference = program->pts_wrap_reference;
807  pts_wrap_behavior = program->pts_wrap_behavior;
808  break;
809  }
810  program = av_find_program_from_stream(s, program, stream_index);
811  }
812 
813  // update every program with differing pts_wrap_reference
814  program = first_program;
815  while (program) {
816  if (program->pts_wrap_reference != pts_wrap_reference) {
817  for (i = 0; i<program->nb_stream_indexes; i++) {
818  s->streams[program->stream_index[i]]->pts_wrap_reference = pts_wrap_reference;
819  s->streams[program->stream_index[i]]->pts_wrap_behavior = pts_wrap_behavior;
820  }
821 
822  program->pts_wrap_reference = pts_wrap_reference;
823  program->pts_wrap_behavior = pts_wrap_behavior;
824  }
825  program = av_find_program_from_stream(s, program, stream_index);
826  }
827  }
828  return 1;
829 }
830 
832 {
833  int ret, i, err;
834  AVStream *st;
835 
836  pkt->data = NULL;
837  pkt->size = 0;
838  av_init_packet(pkt);
839 
840  for (;;) {
842  const AVPacket *pkt1;
843 
844  if (pktl) {
845  st = s->streams[pktl->pkt.stream_index];
847  if ((err = probe_codec(s, st, NULL)) < 0)
848  return err;
849  if (st->request_probe <= 0) {
851  &s->internal->raw_packet_buffer_end, pkt);
853  return 0;
854  }
855  }
856 
857  ret = s->iformat->read_packet(s, pkt);
858  if (ret < 0) {
859  av_packet_unref(pkt);
860 
861  /* Some demuxers return FFERROR_REDO when they consume
862  data and discard it (ignored streams, junk, extradata).
863  We must re-call the demuxer to get the real packet. */
864  if (ret == FFERROR_REDO)
865  continue;
866  if (!pktl || ret == AVERROR(EAGAIN))
867  return ret;
868  for (i = 0; i < s->nb_streams; i++) {
869  st = s->streams[i];
870  if (st->probe_packets || st->request_probe > 0)
871  if ((err = probe_codec(s, st, NULL)) < 0)
872  return err;
873  av_assert0(st->request_probe <= 0);
874  }
875  continue;
876  }
877 
878  err = av_packet_make_refcounted(pkt);
879  if (err < 0) {
880  av_packet_unref(pkt);
881  return err;
882  }
883 
884  if ((s->flags & AVFMT_FLAG_DISCARD_CORRUPT) &&
885  (pkt->flags & AV_PKT_FLAG_CORRUPT)) {
887  "Dropped corrupted packet (stream = %d)\n",
888  pkt->stream_index);
889  av_packet_unref(pkt);
890  continue;
891  }
892 
893  av_assert0(pkt->stream_index < (unsigned)s->nb_streams &&
894  "Invalid stream index.\n");
895 
896  st = s->streams[pkt->stream_index];
897 
899  // correct first time stamps to negative values
900  if (!is_relative(st->first_dts))
901  st->first_dts = wrap_timestamp(st, st->first_dts);
902  if (!is_relative(st->start_time))
903  st->start_time = wrap_timestamp(st, st->start_time);
904  if (!is_relative(st->cur_dts))
905  st->cur_dts = wrap_timestamp(st, st->cur_dts);
906  }
907 
908  pkt->dts = wrap_timestamp(st, pkt->dts);
909  pkt->pts = wrap_timestamp(st, pkt->pts);
910 
911  force_codec_ids(s, st);
912 
913  /* TODO: audio: time filter; video: frame reordering (pts != dts) */
915  pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
916 
917  if (!pktl && st->request_probe <= 0)
918  return ret;
919 
922  pkt, 0);
923  if (err < 0) {
924  av_packet_unref(pkt);
925  return err;
926  }
927  pkt1 = &s->internal->raw_packet_buffer_end->pkt;
929 
930  if ((err = probe_codec(s, st, pkt1)) < 0)
931  return err;
932  }
933 }
934 
935 
936 /**********************************************************/
937 
939 {
940  switch(avctx->codec_id) {
941  case AV_CODEC_ID_MP1:
942  case AV_CODEC_ID_MP2:
943  case AV_CODEC_ID_MP3:
944  case AV_CODEC_ID_CODEC2:
945  return 1;
946  }
947 
948  return 0;
949 }
950 
951 /**
952  * Return the frame duration in seconds. Return 0 if not available.
953  */
954 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
956 {
957  AVRational codec_framerate = s->iformat ? st->internal->avctx->framerate :
958  av_mul_q(av_inv_q(st->internal->avctx->time_base), (AVRational){1, st->internal->avctx->ticks_per_frame});
959  int frame_size, sample_rate;
960 
961 #if FF_API_LAVF_AVCTX
963  if ((!codec_framerate.den || !codec_framerate.num) && st->codec->time_base.den && st->codec->time_base.num)
964  codec_framerate = av_mul_q(av_inv_q(st->codec->time_base), (AVRational){1, st->codec->ticks_per_frame});
966 #endif
967 
968  *pnum = 0;
969  *pden = 0;
970  switch (st->codecpar->codec_type) {
971  case AVMEDIA_TYPE_VIDEO:
972  if (st->r_frame_rate.num && !pc && s->iformat) {
973  *pnum = st->r_frame_rate.den;
974  *pden = st->r_frame_rate.num;
975  } else if (st->time_base.num * 1000LL > st->time_base.den) {
976  *pnum = st->time_base.num;
977  *pden = st->time_base.den;
978  } else if (codec_framerate.den * 1000LL > codec_framerate.num) {
980  av_reduce(pnum, pden,
981  codec_framerate.den,
982  codec_framerate.num * (int64_t)st->internal->avctx->ticks_per_frame,
983  INT_MAX);
984 
985  if (pc && pc->repeat_pict) {
986  av_assert0(s->iformat); // this may be wrong for interlaced encoding but its not used for that case
987  av_reduce(pnum, pden,
988  (*pnum) * (1LL + pc->repeat_pict),
989  (*pden),
990  INT_MAX);
991  }
992  /* If this codec can be interlaced or progressive then we need
993  * a parser to compute duration of a packet. Thus if we have
994  * no parser in such case leave duration undefined. */
995  if (st->internal->avctx->ticks_per_frame > 1 && !pc)
996  *pnum = *pden = 0;
997  }
998  break;
999  case AVMEDIA_TYPE_AUDIO:
1000  if (st->internal->avctx_inited) {
1001  frame_size = av_get_audio_frame_duration(st->internal->avctx, pkt->size);
1002  sample_rate = st->internal->avctx->sample_rate;
1003  } else {
1004  frame_size = av_get_audio_frame_duration2(st->codecpar, pkt->size);
1005  sample_rate = st->codecpar->sample_rate;
1006  }
1007  if (frame_size <= 0 || sample_rate <= 0)
1008  break;
1009  *pnum = frame_size;
1010  *pden = sample_rate;
1011  break;
1012  default:
1013  break;
1014  }
1015 }
1016 
1017 static int is_intra_only(enum AVCodecID id)
1018 {
1020  if (!d)
1021  return 0;
1022  if ((d->type == AVMEDIA_TYPE_VIDEO || d->type == AVMEDIA_TYPE_AUDIO) &&
1024  return 0;
1025  return 1;
1026 }
1027 
1029 {
1030  if (st->codecpar->codec_id != AV_CODEC_ID_H264) return 1;
1031  if (!st->info) // if we have left find_stream_info then nb_decoded_frames won't increase anymore for stream copy
1032  return 1;
1033 #if CONFIG_H264_DECODER
1034  if (st->internal->avctx->has_b_frames &&
1036  return 1;
1037 #endif
1038  if (st->internal->avctx->has_b_frames<3)
1039  return st->nb_decoded_frames >= 7;
1040  else if (st->internal->avctx->has_b_frames<4)
1041  return st->nb_decoded_frames >= 18;
1042  else
1043  return st->nb_decoded_frames >= 20;
1044 }
1045 
1047 {
1048  if (pktl->next)
1049  return pktl->next;
1050  if (pktl == s->internal->packet_buffer_end)
1051  return s->internal->parse_queue;
1052  return NULL;
1053 }
1054 
1055 static int64_t select_from_pts_buffer(AVStream *st, int64_t *pts_buffer, int64_t dts) {
1056  int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
1058 
1059  if(!onein_oneout) {
1060  int delay = st->internal->avctx->has_b_frames;
1061  int i;
1062 
1063  if (dts == AV_NOPTS_VALUE) {
1064  int64_t best_score = INT64_MAX;
1065  for (i = 0; i<delay; i++) {
1066  if (st->pts_reorder_error_count[i]) {
1067  int64_t score = st->pts_reorder_error[i] / st->pts_reorder_error_count[i];
1068  if (score < best_score) {
1069  best_score = score;
1070  dts = pts_buffer[i];
1071  }
1072  }
1073  }
1074  } else {
1075  for (i = 0; i<delay; i++) {
1076  if (pts_buffer[i] != AV_NOPTS_VALUE) {
1077  int64_t diff = FFABS(pts_buffer[i] - dts)
1078  + (uint64_t)st->pts_reorder_error[i];
1079  diff = FFMAX(diff, st->pts_reorder_error[i]);
1080  st->pts_reorder_error[i] = diff;
1081  st->pts_reorder_error_count[i]++;
1082  if (st->pts_reorder_error_count[i] > 250) {
1083  st->pts_reorder_error[i] >>= 1;
1084  st->pts_reorder_error_count[i] >>= 1;
1085  }
1086  }
1087  }
1088  }
1089  }
1090 
1091  if (dts == AV_NOPTS_VALUE)
1092  dts = pts_buffer[0];
1093 
1094  return dts;
1095 }
1096 
1097 /**
1098  * Updates the dts of packets of a stream in pkt_buffer, by re-ordering the pts
1099  * of the packets in a window.
1100  */
1101 static void update_dts_from_pts(AVFormatContext *s, int stream_index,
1102  AVPacketList *pkt_buffer)
1103 {
1104  AVStream *st = s->streams[stream_index];
1105  int delay = st->internal->avctx->has_b_frames;
1106  int i;
1107 
1108  int64_t pts_buffer[MAX_REORDER_DELAY+1];
1109 
1110  for (i = 0; i<MAX_REORDER_DELAY+1; i++)
1111  pts_buffer[i] = AV_NOPTS_VALUE;
1112 
1113  for (; pkt_buffer; pkt_buffer = get_next_pkt(s, st, pkt_buffer)) {
1114  if (pkt_buffer->pkt.stream_index != stream_index)
1115  continue;
1116 
1117  if (pkt_buffer->pkt.pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
1118  pts_buffer[0] = pkt_buffer->pkt.pts;
1119  for (i = 0; i<delay && pts_buffer[i] > pts_buffer[i + 1]; i++)
1120  FFSWAP(int64_t, pts_buffer[i], pts_buffer[i + 1]);
1121 
1122  pkt_buffer->pkt.dts = select_from_pts_buffer(st, pts_buffer, pkt_buffer->pkt.dts);
1123  }
1124  }
1125 }
1126 
1127 static void update_initial_timestamps(AVFormatContext *s, int stream_index,
1128  int64_t dts, int64_t pts, AVPacket *pkt)
1129 {
1130  AVStream *st = s->streams[stream_index];
1132  AVPacketList *pktl_it;
1133 
1134  uint64_t shift;
1135 
1136  if (st->first_dts != AV_NOPTS_VALUE ||
1137  dts == AV_NOPTS_VALUE ||
1138  st->cur_dts == AV_NOPTS_VALUE ||
1139  st->cur_dts < INT_MIN + RELATIVE_TS_BASE ||
1140  is_relative(dts))
1141  return;
1142 
1143  st->first_dts = dts - (st->cur_dts - RELATIVE_TS_BASE);
1144  st->cur_dts = dts;
1145  shift = (uint64_t)st->first_dts - RELATIVE_TS_BASE;
1146 
1147  if (is_relative(pts))
1148  pts += shift;
1149 
1150  for (pktl_it = pktl; pktl_it; pktl_it = get_next_pkt(s, st, pktl_it)) {
1151  if (pktl_it->pkt.stream_index != stream_index)
1152  continue;
1153  if (is_relative(pktl_it->pkt.pts))
1154  pktl_it->pkt.pts += shift;
1155 
1156  if (is_relative(pktl_it->pkt.dts))
1157  pktl_it->pkt.dts += shift;
1158 
1159  if (st->start_time == AV_NOPTS_VALUE && pktl_it->pkt.pts != AV_NOPTS_VALUE) {
1160  st->start_time = pktl_it->pkt.pts;
1162  st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
1163  }
1164  }
1165 
1167  update_dts_from_pts(s, stream_index, pktl);
1168  }
1169 
1170  if (st->start_time == AV_NOPTS_VALUE) {
1171  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || !(pkt->flags & AV_PKT_FLAG_DISCARD)) {
1172  st->start_time = pts;
1173  }
1175  st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
1176  }
1177 }
1178 
1180  int stream_index, int duration)
1181 {
1183  int64_t cur_dts = RELATIVE_TS_BASE;
1184 
1185  if (st->first_dts != AV_NOPTS_VALUE) {
1187  return;
1189  cur_dts = st->first_dts;
1190  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
1191  if (pktl->pkt.stream_index == stream_index) {
1192  if (pktl->pkt.pts != pktl->pkt.dts ||
1193  pktl->pkt.dts != AV_NOPTS_VALUE ||
1194  pktl->pkt.duration)
1195  break;
1196  cur_dts -= duration;
1197  }
1198  }
1199  if (pktl && pktl->pkt.dts != st->first_dts) {
1200  av_log(s, AV_LOG_DEBUG, "first_dts %s not matching first dts %s (pts %s, duration %"PRId64") in the queue\n",
1201  av_ts2str(st->first_dts), av_ts2str(pktl->pkt.dts), av_ts2str(pktl->pkt.pts), pktl->pkt.duration);
1202  return;
1203  }
1204  if (!pktl) {
1205  av_log(s, AV_LOG_DEBUG, "first_dts %s but no packet with dts in the queue\n", av_ts2str(st->first_dts));
1206  return;
1207  }
1209  st->first_dts = cur_dts;
1210  } else if (st->cur_dts != RELATIVE_TS_BASE)
1211  return;
1212 
1213  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
1214  if (pktl->pkt.stream_index != stream_index)
1215  continue;
1216  if ((pktl->pkt.pts == pktl->pkt.dts ||
1217  pktl->pkt.pts == AV_NOPTS_VALUE) &&
1218  (pktl->pkt.dts == AV_NOPTS_VALUE ||
1219  pktl->pkt.dts == st->first_dts ||
1220  pktl->pkt.dts == RELATIVE_TS_BASE) &&
1221  !pktl->pkt.duration) {
1222  pktl->pkt.dts = cur_dts;
1223  if (!st->internal->avctx->has_b_frames)
1224  pktl->pkt.pts = cur_dts;
1225 // if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1226  pktl->pkt.duration = duration;
1227  } else
1228  break;
1229  cur_dts = pktl->pkt.dts + pktl->pkt.duration;
1230  }
1231  if (!pktl)
1232  st->cur_dts = cur_dts;
1233 }
1234 
1237  int64_t next_dts, int64_t next_pts)
1238 {
1239  int num, den, presentation_delayed, delay, i;
1240  int64_t offset;
1242  int onein_oneout = st->codecpar->codec_id != AV_CODEC_ID_H264 &&
1244 
1245  if (s->flags & AVFMT_FLAG_NOFILLIN)
1246  return;
1247 
1248  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && pkt->dts != AV_NOPTS_VALUE) {
1249  if (pkt->dts == pkt->pts && st->last_dts_for_order_check != AV_NOPTS_VALUE) {
1250  if (st->last_dts_for_order_check <= pkt->dts) {
1251  st->dts_ordered++;
1252  } else {
1254  "DTS %"PRIi64" < %"PRIi64" out of order\n",
1255  pkt->dts,
1257  st->dts_misordered++;
1258  }
1259  if (st->dts_ordered + st->dts_misordered > 250) {
1260  st->dts_ordered >>= 1;
1261  st->dts_misordered >>= 1;
1262  }
1263  }
1264 
1265  st->last_dts_for_order_check = pkt->dts;
1266  if (st->dts_ordered < 8*st->dts_misordered && pkt->dts == pkt->pts)
1267  pkt->dts = AV_NOPTS_VALUE;
1268  }
1269 
1270  if ((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
1271  pkt->dts = AV_NOPTS_VALUE;
1272 
1273  if (pc && pc->pict_type == AV_PICTURE_TYPE_B
1274  && !st->internal->avctx->has_b_frames)
1275  //FIXME Set low_delay = 0 when has_b_frames = 1
1276  st->internal->avctx->has_b_frames = 1;
1277 
1278  /* do we have a video B-frame ? */
1279  delay = st->internal->avctx->has_b_frames;
1280  presentation_delayed = 0;
1281 
1282  /* XXX: need has_b_frame, but cannot get it if the codec is
1283  * not initialized */
1284  if (delay &&
1285  pc && pc->pict_type != AV_PICTURE_TYPE_B)
1286  presentation_delayed = 1;
1287 
1288  if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
1289  st->pts_wrap_bits < 63 &&
1290  pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
1291  if (is_relative(st->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > st->cur_dts) {
1292  pkt->dts -= 1LL << st->pts_wrap_bits;
1293  } else
1294  pkt->pts += 1LL << st->pts_wrap_bits;
1295  }
1296 
1297  /* Some MPEG-2 in MPEG-PS lack dts (issue #171 / input_file.mpg).
1298  * We take the conservative approach and discard both.
1299  * Note: If this is misbehaving for an H.264 file, then possibly
1300  * presentation_delayed is not set correctly. */
1301  if (delay == 1 && pkt->dts == pkt->pts &&
1302  pkt->dts != AV_NOPTS_VALUE && presentation_delayed) {
1303  av_log(s, AV_LOG_DEBUG, "invalid dts/pts combination %"PRIi64"\n", pkt->dts);
1304  if ( strcmp(s->iformat->name, "mov,mp4,m4a,3gp,3g2,mj2")
1305  && strcmp(s->iformat->name, "flv")) // otherwise we discard correct timestamps for vc1-wmapro.ism
1306  pkt->dts = AV_NOPTS_VALUE;
1307  }
1308 
1309  duration = av_mul_q((AVRational) {pkt->duration, 1}, st->time_base);
1310  if (pkt->duration <= 0) {
1311  ff_compute_frame_duration(s, &num, &den, st, pc, pkt);
1312  if (den && num) {
1313  duration = (AVRational) {num, den};
1314  pkt->duration = av_rescale_rnd(1,
1315  num * (int64_t) st->time_base.den,
1316  den * (int64_t) st->time_base.num,
1317  AV_ROUND_DOWN);
1318  }
1319  }
1320 
1321  if (pkt->duration > 0 && (s->internal->packet_buffer || s->internal->parse_queue))
1322  update_initial_durations(s, st, pkt->stream_index, pkt->duration);
1323 
1324  /* Correct timestamps with byte offset if demuxers only have timestamps
1325  * on packet boundaries */
1326  if (pc && st->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size) {
1327  /* this will estimate bitrate based on this frame's duration and size */
1328  offset = av_rescale(pc->offset, pkt->duration, pkt->size);
1329  if (pkt->pts != AV_NOPTS_VALUE)
1330  pkt->pts += offset;
1331  if (pkt->dts != AV_NOPTS_VALUE)
1332  pkt->dts += offset;
1333  }
1334 
1335  /* This may be redundant, but it should not hurt. */
1336  if (pkt->dts != AV_NOPTS_VALUE &&
1337  pkt->pts != AV_NOPTS_VALUE &&
1338  pkt->pts > pkt->dts)
1339  presentation_delayed = 1;
1340 
1341  if (s->debug & FF_FDEBUG_TS)
1342  av_log(s, AV_LOG_DEBUG,
1343  "IN delayed:%d pts:%s, dts:%s cur_dts:%s st:%d pc:%p duration:%"PRId64" delay:%d onein_oneout:%d\n",
1344  presentation_delayed, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts),
1345  pkt->stream_index, pc, pkt->duration, delay, onein_oneout);
1346 
1347  /* Interpolate PTS and DTS if they are not present. We skip H264
1348  * currently because delay and has_b_frames are not reliably set. */
1349  if ((delay == 0 || (delay == 1 && pc)) &&
1350  onein_oneout) {
1351  if (presentation_delayed) {
1352  /* DTS = decompression timestamp */
1353  /* PTS = presentation timestamp */
1354  if (pkt->dts == AV_NOPTS_VALUE)
1355  pkt->dts = st->last_IP_pts;
1356  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1357  if (pkt->dts == AV_NOPTS_VALUE)
1358  pkt->dts = st->cur_dts;
1359 
1360  /* This is tricky: the dts must be incremented by the duration
1361  * of the frame we are displaying, i.e. the last I- or P-frame. */
1362  if (st->last_IP_duration == 0 && (uint64_t)pkt->duration <= INT32_MAX)
1363  st->last_IP_duration = pkt->duration;
1364  if (pkt->dts != AV_NOPTS_VALUE)
1365  st->cur_dts = pkt->dts + st->last_IP_duration;
1366  if (pkt->dts != AV_NOPTS_VALUE &&
1367  pkt->pts == AV_NOPTS_VALUE &&
1368  st->last_IP_duration > 0 &&
1369  ((uint64_t)st->cur_dts - (uint64_t)next_dts + 1) <= 2 &&
1370  next_dts != next_pts &&
1371  next_pts != AV_NOPTS_VALUE)
1372  pkt->pts = next_dts;
1373 
1374  if ((uint64_t)pkt->duration <= INT32_MAX)
1375  st->last_IP_duration = pkt->duration;
1376  st->last_IP_pts = pkt->pts;
1377  /* Cannot compute PTS if not present (we can compute it only
1378  * by knowing the future. */
1379  } else if (pkt->pts != AV_NOPTS_VALUE ||
1380  pkt->dts != AV_NOPTS_VALUE ||
1381  pkt->duration > 0 ) {
1382 
1383  /* presentation is not delayed : PTS and DTS are the same */
1384  if (pkt->pts == AV_NOPTS_VALUE)
1385  pkt->pts = pkt->dts;
1387  pkt->pts, pkt);
1388  if (pkt->pts == AV_NOPTS_VALUE)
1389  pkt->pts = st->cur_dts;
1390  pkt->dts = pkt->pts;
1391  if (pkt->pts != AV_NOPTS_VALUE && duration.num >= 0)
1392  st->cur_dts = av_add_stable(st->time_base, pkt->pts, duration, 1);
1393  }
1394  }
1395 
1396  if (pkt->pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
1397  st->pts_buffer[0] = pkt->pts;
1398  for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
1399  FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
1400 
1402  pkt->dts = select_from_pts_buffer(st, st->pts_buffer, pkt->dts);
1403  }
1404  // We skipped it above so we try here.
1405  if (!onein_oneout)
1406  // This should happen on the first packet
1407  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1408  if (pkt->dts > st->cur_dts)
1409  st->cur_dts = pkt->dts;
1410 
1411  if (s->debug & FF_FDEBUG_TS)
1412  av_log(s, AV_LOG_DEBUG, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s st:%d (%d)\n",
1413  presentation_delayed, delay, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), st->index, st->id);
1414 
1415  /* update flags */
1417  pkt->flags |= AV_PKT_FLAG_KEY;
1418 #if FF_API_CONVERGENCE_DURATION
1420  if (pc)
1423 #endif
1424 }
1425 
1426 void ff_packet_list_free(AVPacketList **pkt_buf, AVPacketList **pkt_buf_end)
1427 {
1428  AVPacketList *tmp = *pkt_buf;
1429 
1430  while (tmp) {
1431  AVPacketList *pktl = tmp;
1432  tmp = pktl->next;
1433  av_packet_unref(&pktl->pkt);
1434  av_freep(&pktl);
1435  }
1436  *pkt_buf = NULL;
1437  *pkt_buf_end = NULL;
1438 }
1439 
1440 /**
1441  * Parse a packet, add all split parts to parse_queue.
1442  *
1443  * @param pkt Packet to parse; must not be NULL.
1444  * @param flush Indicates whether to flush. If set, pkt must be blank.
1445  */
1447  int stream_index, int flush)
1448 {
1449  AVPacket out_pkt;
1450  AVStream *st = s->streams[stream_index];
1451  uint8_t *data = pkt->data;
1452  int size = pkt->size;
1453  int ret = 0, got_output = flush;
1454 
1455  if (size || flush) {
1456  av_init_packet(&out_pkt);
1457  } else if (st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
1458  // preserve 0-size sync packets
1460  }
1461 
1462  while (size > 0 || (flush && got_output)) {
1463  int len;
1464  int64_t next_pts = pkt->pts;
1465  int64_t next_dts = pkt->dts;
1466 
1467  len = av_parser_parse2(st->parser, st->internal->avctx,
1468  &out_pkt.data, &out_pkt.size, data, size,
1469  pkt->pts, pkt->dts, pkt->pos);
1470 
1471  pkt->pts = pkt->dts = AV_NOPTS_VALUE;
1472  pkt->pos = -1;
1473  /* increment read pointer */
1474  data += len;
1475  size -= len;
1476 
1477  got_output = !!out_pkt.size;
1478 
1479  if (!out_pkt.size)
1480  continue;
1481 
1482  if (pkt->buf && out_pkt.data == pkt->data) {
1483  /* reference pkt->buf only when out_pkt.data is guaranteed to point
1484  * to data in it and not in the parser's internal buffer. */
1485  /* XXX: Ensure this is the case with all parsers when st->parser->flags
1486  * is PARSER_FLAG_COMPLETE_FRAMES and check for that instead? */
1487  out_pkt.buf = av_buffer_ref(pkt->buf);
1488  if (!out_pkt.buf) {
1489  ret = AVERROR(ENOMEM);
1490  goto fail;
1491  }
1492  } else {
1493  ret = av_packet_make_refcounted(&out_pkt);
1494  if (ret < 0)
1495  goto fail;
1496  }
1497 
1498  if (pkt->side_data) {
1499  out_pkt.side_data = pkt->side_data;
1500  out_pkt.side_data_elems = pkt->side_data_elems;
1501  pkt->side_data = NULL;
1502  pkt->side_data_elems = 0;
1503  }
1504 
1505  /* set the duration */
1506  out_pkt.duration = (st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) ? pkt->duration : 0;
1508  if (st->internal->avctx->sample_rate > 0) {
1509  out_pkt.duration =
1511  (AVRational) { 1, st->internal->avctx->sample_rate },
1512  st->time_base,
1513  AV_ROUND_DOWN);
1514  }
1515  }
1516 
1517  out_pkt.stream_index = st->index;
1518  out_pkt.pts = st->parser->pts;
1519  out_pkt.dts = st->parser->dts;
1520  out_pkt.pos = st->parser->pos;
1521  out_pkt.flags |= pkt->flags & AV_PKT_FLAG_DISCARD;
1522 
1524  out_pkt.pos = st->parser->frame_offset;
1525 
1526  if (st->parser->key_frame == 1 ||
1527  (st->parser->key_frame == -1 &&
1529  out_pkt.flags |= AV_PKT_FLAG_KEY;
1530 
1531  if (st->parser->key_frame == -1 && st->parser->pict_type ==AV_PICTURE_TYPE_NONE && (pkt->flags&AV_PKT_FLAG_KEY))
1532  out_pkt.flags |= AV_PKT_FLAG_KEY;
1533 
1534  compute_pkt_fields(s, st, st->parser, &out_pkt, next_dts, next_pts);
1535 
1538  &out_pkt, 0);
1539  if (ret < 0) {
1540  av_packet_unref(&out_pkt);
1541  goto fail;
1542  }
1543  }
1544 
1545  /* end of the stream => close and free the parser */
1546  if (flush) {
1547  av_parser_close(st->parser);
1548  st->parser = NULL;
1549  }
1550 
1551 fail:
1552  av_packet_unref(pkt);
1553  return ret;
1554 }
1555 
1557  AVPacketList **pkt_buffer_end,
1558  AVPacket *pkt)
1559 {
1560  AVPacketList *pktl;
1561  av_assert0(*pkt_buffer);
1562  pktl = *pkt_buffer;
1563  *pkt = pktl->pkt;
1564  *pkt_buffer = pktl->next;
1565  if (!pktl->next)
1566  *pkt_buffer_end = NULL;
1567  av_freep(&pktl);
1568  return 0;
1569 }
1570 
1571 static int64_t ts_to_samples(AVStream *st, int64_t ts)
1572 {
1573  return av_rescale(ts, st->time_base.num * st->codecpar->sample_rate, st->time_base.den);
1574 }
1575 
1577 {
1578  int ret, i, got_packet = 0;
1579  AVDictionary *metadata = NULL;
1580 
1581  while (!got_packet && !s->internal->parse_queue) {
1582  AVStream *st;
1583 
1584  /* read next packet */
1585  ret = ff_read_packet(s, pkt);
1586  if (ret < 0) {
1587  if (ret == AVERROR(EAGAIN))
1588  return ret;
1589  /* flush the parsers */
1590  for (i = 0; i < s->nb_streams; i++) {
1591  st = s->streams[i];
1592  if (st->parser && st->need_parsing)
1593  parse_packet(s, pkt, st->index, 1);
1594  }
1595  /* all remaining packets are now in parse_queue =>
1596  * really terminate parsing */
1597  break;
1598  }
1599  ret = 0;
1600  st = s->streams[pkt->stream_index];
1601 
1602  /* update context if required */
1603  if (st->internal->need_context_update) {
1604  if (avcodec_is_open(st->internal->avctx)) {
1605  av_log(s, AV_LOG_DEBUG, "Demuxer context update while decoder is open, closing and trying to re-open\n");
1607  st->info->found_decoder = 0;
1608  }
1609 
1610  /* close parser, because it depends on the codec */
1611  if (st->parser && st->internal->avctx->codec_id != st->codecpar->codec_id) {
1612  av_parser_close(st->parser);
1613  st->parser = NULL;
1614  }
1615 
1617  if (ret < 0) {
1618  av_packet_unref(pkt);
1619  return ret;
1620  }
1621 
1622 #if FF_API_LAVF_AVCTX
1624  /* update deprecated public codec context */
1625  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
1626  if (ret < 0) {
1627  av_packet_unref(pkt);
1628  return ret;
1629  }
1631 #endif
1632 
1633  st->internal->need_context_update = 0;
1634  }
1635 
1636  if (pkt->pts != AV_NOPTS_VALUE &&
1637  pkt->dts != AV_NOPTS_VALUE &&
1638  pkt->pts < pkt->dts) {
1640  "Invalid timestamps stream=%d, pts=%s, dts=%s, size=%d\n",
1641  pkt->stream_index,
1642  av_ts2str(pkt->pts),
1643  av_ts2str(pkt->dts),
1644  pkt->size);
1645  }
1646  if (s->debug & FF_FDEBUG_TS)
1647  av_log(s, AV_LOG_DEBUG,
1648  "ff_read_packet stream=%d, pts=%s, dts=%s, size=%d, duration=%"PRId64", flags=%d\n",
1649  pkt->stream_index,
1650  av_ts2str(pkt->pts),
1651  av_ts2str(pkt->dts),
1652  pkt->size, pkt->duration, pkt->flags);
1653 
1654  if (st->need_parsing && !st->parser && !(s->flags & AVFMT_FLAG_NOPARSE)) {
1655  st->parser = av_parser_init(st->codecpar->codec_id);
1656  if (!st->parser) {
1657  av_log(s, AV_LOG_VERBOSE, "parser not found for codec "
1658  "%s, packets or times may be invalid.\n",
1660  /* no parser available: just output the raw packets */
1662  } else if (st->need_parsing == AVSTREAM_PARSE_HEADERS)
1664  else if (st->need_parsing == AVSTREAM_PARSE_FULL_ONCE)
1665  st->parser->flags |= PARSER_FLAG_ONCE;
1666  else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW)
1668  }
1669 
1670  if (!st->need_parsing || !st->parser) {
1671  /* no parsing needed: we just output the packet as is */
1673  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) &&
1674  (pkt->flags & AV_PKT_FLAG_KEY) && pkt->dts != AV_NOPTS_VALUE) {
1675  ff_reduce_index(s, st->index);
1676  av_add_index_entry(st, pkt->pos, pkt->dts,
1677  0, 0, AVINDEX_KEYFRAME);
1678  }
1679  got_packet = 1;
1680  } else if (st->discard < AVDISCARD_ALL) {
1681  if ((ret = parse_packet(s, pkt, pkt->stream_index, 0)) < 0)
1682  return ret;
1684  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
1685  st->codecpar->channels = st->internal->avctx->channels;
1687  st->codecpar->codec_id = st->internal->avctx->codec_id;
1688  } else {
1689  /* free packet */
1690  av_packet_unref(pkt);
1691  }
1692  if (pkt->flags & AV_PKT_FLAG_KEY)
1693  st->skip_to_keyframe = 0;
1694  if (st->skip_to_keyframe) {
1695  av_packet_unref(pkt);
1696  got_packet = 0;
1697  }
1698  }
1699 
1700  if (!got_packet && s->internal->parse_queue)
1702 
1703  if (ret >= 0) {
1704  AVStream *st = s->streams[pkt->stream_index];
1705  int discard_padding = 0;
1706  if (st->first_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
1707  int64_t pts = pkt->pts - (is_relative(pkt->pts) ? RELATIVE_TS_BASE : 0);
1708  int64_t sample = ts_to_samples(st, pts);
1709  int duration = ts_to_samples(st, pkt->duration);
1710  int64_t end_sample = sample + duration;
1711  if (duration > 0 && end_sample >= st->first_discard_sample &&
1712  sample < st->last_discard_sample)
1713  discard_padding = FFMIN(end_sample - st->first_discard_sample, duration);
1714  }
1715  if (st->start_skip_samples && (pkt->pts == 0 || pkt->pts == RELATIVE_TS_BASE))
1716  st->skip_samples = st->start_skip_samples;
1717  if (st->skip_samples || discard_padding) {
1719  if (p) {
1720  AV_WL32(p, st->skip_samples);
1721  AV_WL32(p + 4, discard_padding);
1722  av_log(s, AV_LOG_DEBUG, "demuxer injecting skip %d / discard %d\n", st->skip_samples, discard_padding);
1723  }
1724  st->skip_samples = 0;
1725  }
1726 
1727  if (st->inject_global_side_data) {
1728  for (i = 0; i < st->nb_side_data; i++) {
1729  AVPacketSideData *src_sd = &st->side_data[i];
1730  uint8_t *dst_data;
1731 
1732  if (av_packet_get_side_data(pkt, src_sd->type, NULL))
1733  continue;
1734 
1735  dst_data = av_packet_new_side_data(pkt, src_sd->type, src_sd->size);
1736  if (!dst_data) {
1737  av_log(s, AV_LOG_WARNING, "Could not inject global side data\n");
1738  continue;
1739  }
1740 
1741  memcpy(dst_data, src_sd->data, src_sd->size);
1742  }
1743  st->inject_global_side_data = 0;
1744  }
1745  }
1746 
1747  av_opt_get_dict_val(s, "metadata", AV_OPT_SEARCH_CHILDREN, &metadata);
1748  if (metadata) {
1750  av_dict_copy(&s->metadata, metadata, 0);
1751  av_dict_free(&metadata);
1753  }
1754 
1755 #if FF_API_LAVF_AVCTX
1757 #endif
1758 
1759  if (s->debug & FF_FDEBUG_TS)
1760  av_log(s, AV_LOG_DEBUG,
1761  "read_frame_internal stream=%d, pts=%s, dts=%s, "
1762  "size=%d, duration=%"PRId64", flags=%d\n",
1763  pkt->stream_index,
1764  av_ts2str(pkt->pts),
1765  av_ts2str(pkt->dts),
1766  pkt->size, pkt->duration, pkt->flags);
1767 
1768  /* A demuxer might have returned EOF because of an IO error, let's
1769  * propagate this back to the user. */
1770  if (ret == AVERROR_EOF && s->pb && s->pb->error < 0 && s->pb->error != AVERROR(EAGAIN))
1771  ret = s->pb->error;
1772 
1773  return ret;
1774 }
1775 
1777 {
1778  const int genpts = s->flags & AVFMT_FLAG_GENPTS;
1779  int eof = 0;
1780  int ret;
1781  AVStream *st;
1782 
1783  if (!genpts) {
1784  ret = s->internal->packet_buffer
1786  &s->internal->packet_buffer_end, pkt)
1787  : read_frame_internal(s, pkt);
1788  if (ret < 0)
1789  return ret;
1790  goto return_packet;
1791  }
1792 
1793  for (;;) {
1794  AVPacketList *pktl = s->internal->packet_buffer;
1795 
1796  if (pktl) {
1797  AVPacket *next_pkt = &pktl->pkt;
1798 
1799  if (next_pkt->dts != AV_NOPTS_VALUE) {
1800  int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits;
1801  // last dts seen for this stream. if any of packets following
1802  // current one had no dts, we will set this to AV_NOPTS_VALUE.
1803  int64_t last_dts = next_pkt->dts;
1804  av_assert2(wrap_bits <= 64);
1805  while (pktl && next_pkt->pts == AV_NOPTS_VALUE) {
1806  if (pktl->pkt.stream_index == next_pkt->stream_index &&
1807  av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2ULL << (wrap_bits - 1)) < 0) {
1808  if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2ULL << (wrap_bits - 1))) {
1809  // not B-frame
1810  next_pkt->pts = pktl->pkt.dts;
1811  }
1812  if (last_dts != AV_NOPTS_VALUE) {
1813  // Once last dts was set to AV_NOPTS_VALUE, we don't change it.
1814  last_dts = pktl->pkt.dts;
1815  }
1816  }
1817  pktl = pktl->next;
1818  }
1819  if (eof && next_pkt->pts == AV_NOPTS_VALUE && last_dts != AV_NOPTS_VALUE) {
1820  // Fixing the last reference frame had none pts issue (For MXF etc).
1821  // We only do this when
1822  // 1. eof.
1823  // 2. we are not able to resolve a pts value for current packet.
1824  // 3. the packets for this stream at the end of the files had valid dts.
1825  next_pkt->pts = last_dts + next_pkt->duration;
1826  }
1827  pktl = s->internal->packet_buffer;
1828  }
1829 
1830  /* read packet from packet buffer, if there is data */
1831  st = s->streams[next_pkt->stream_index];
1832  if (!(next_pkt->pts == AV_NOPTS_VALUE && st->discard < AVDISCARD_ALL &&
1833  next_pkt->dts != AV_NOPTS_VALUE && !eof)) {
1835  &s->internal->packet_buffer_end, pkt);
1836  goto return_packet;
1837  }
1838  }
1839 
1840  ret = read_frame_internal(s, pkt);
1841  if (ret < 0) {
1842  if (pktl && ret != AVERROR(EAGAIN)) {
1843  eof = 1;
1844  continue;
1845  } else
1846  return ret;
1847  }
1848 
1851  pkt, 0);
1852  if (ret < 0) {
1853  av_packet_unref(pkt);
1854  return ret;
1855  }
1856  }
1857 
1858 return_packet:
1859 
1860  st = s->streams[pkt->stream_index];
1861  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & AV_PKT_FLAG_KEY) {
1862  ff_reduce_index(s, st->index);
1863  av_add_index_entry(st, pkt->pos, pkt->dts, 0, 0, AVINDEX_KEYFRAME);
1864  }
1865 
1866  if (is_relative(pkt->dts))
1867  pkt->dts -= RELATIVE_TS_BASE;
1868  if (is_relative(pkt->pts))
1869  pkt->pts -= RELATIVE_TS_BASE;
1870 
1871  return ret;
1872 }
1873 
1874 /* XXX: suppress the packet queue */
1876 {
1877  if (!s->internal)
1878  return;
1882 
1884 }
1885 
1886 /*******************************************************/
1887 /* seek support */
1888 
1890 {
1891  int i;
1892  AVStream *st;
1893  int best_stream = 0;
1894  int best_score = INT_MIN;
1895 
1896  if (s->nb_streams <= 0)
1897  return -1;
1898  for (i = 0; i < s->nb_streams; i++) {
1899  int score = 0;
1900  st = s->streams[i];
1901  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
1903  score -= 400;
1904  if (st->codecpar->width && st->codecpar->height)
1905  score += 50;
1906  score+= 25;
1907  }
1908  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
1909  if (st->codecpar->sample_rate)
1910  score += 50;
1911  }
1912  if (st->codec_info_nb_frames)
1913  score += 12;
1914 
1915  if (st->discard != AVDISCARD_ALL)
1916  score += 200;
1917 
1918  if (score > best_score) {
1919  best_score = score;
1920  best_stream = i;
1921  }
1922  }
1923  return best_stream;
1924 }
1925 
1926 /** Flush the frame reader. */
1928 {
1929  AVStream *st;
1930  int i, j;
1931 
1932  flush_packet_queue(s);
1933 
1934  /* Reset read state for each stream. */
1935  for (i = 0; i < s->nb_streams; i++) {
1936  st = s->streams[i];
1937 
1938  if (st->parser) {
1939  av_parser_close(st->parser);
1940  st->parser = NULL;
1941  }
1944  if (st->first_dts == AV_NOPTS_VALUE)
1945  st->cur_dts = RELATIVE_TS_BASE;
1946  else
1947  /* We set the current DTS to an unspecified origin. */
1948  st->cur_dts = AV_NOPTS_VALUE;
1949 
1951 
1952  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
1953  st->pts_buffer[j] = AV_NOPTS_VALUE;
1954 
1956  st->inject_global_side_data = 1;
1957 
1958  st->skip_samples = 0;
1959  }
1960 }
1961 
1962 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
1963 {
1964  int i;
1965 
1966  for (i = 0; i < s->nb_streams; i++) {
1967  AVStream *st = s->streams[i];
1968 
1969  st->cur_dts =
1970  av_rescale(timestamp,
1971  st->time_base.den * (int64_t) ref_st->time_base.num,
1972  st->time_base.num * (int64_t) ref_st->time_base.den);
1973  }
1974 }
1975 
1976 void ff_reduce_index(AVFormatContext *s, int stream_index)
1977 {
1978  AVStream *st = s->streams[stream_index];
1979  unsigned int max_entries = s->max_index_size / sizeof(AVIndexEntry);
1980 
1981  if ((unsigned) st->nb_index_entries >= max_entries) {
1982  int i;
1983  for (i = 0; 2 * i < st->nb_index_entries; i++)
1984  st->index_entries[i] = st->index_entries[2 * i];
1985  st->nb_index_entries = i;
1986  }
1987 }
1988 
1989 int ff_add_index_entry(AVIndexEntry **index_entries,
1990  int *nb_index_entries,
1991  unsigned int *index_entries_allocated_size,
1992  int64_t pos, int64_t timestamp,
1993  int size, int distance, int flags)
1994 {
1995  AVIndexEntry *entries, *ie;
1996  int index;
1997 
1998  if ((unsigned) *nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
1999  return -1;
2000 
2001  if (timestamp == AV_NOPTS_VALUE)
2002  return AVERROR(EINVAL);
2003 
2004  if (size < 0 || size > 0x3FFFFFFF)
2005  return AVERROR(EINVAL);
2006 
2007  if (is_relative(timestamp)) //FIXME this maintains previous behavior but we should shift by the correct offset once known
2008  timestamp -= RELATIVE_TS_BASE;
2009 
2010  entries = av_fast_realloc(*index_entries,
2011  index_entries_allocated_size,
2012  (*nb_index_entries + 1) *
2013  sizeof(AVIndexEntry));
2014  if (!entries)
2015  return -1;
2016 
2017  *index_entries = entries;
2018 
2019  index = ff_index_search_timestamp(*index_entries, *nb_index_entries,
2020  timestamp, AVSEEK_FLAG_ANY);
2021 
2022  if (index < 0) {
2023  index = (*nb_index_entries)++;
2024  ie = &entries[index];
2025  av_assert0(index == 0 || ie[-1].timestamp < timestamp);
2026  } else {
2027  ie = &entries[index];
2028  if (ie->timestamp != timestamp) {
2029  if (ie->timestamp <= timestamp)
2030  return -1;
2031  memmove(entries + index + 1, entries + index,
2032  sizeof(AVIndexEntry) * (*nb_index_entries - index));
2033  (*nb_index_entries)++;
2034  } else if (ie->pos == pos && distance < ie->min_distance)
2035  // do not reduce the distance
2036  distance = ie->min_distance;
2037  }
2038 
2039  ie->pos = pos;
2040  ie->timestamp = timestamp;
2041  ie->min_distance = distance;
2042  ie->size = size;
2043  ie->flags = flags;
2044 
2045  return index;
2046 }
2047 
2048 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
2049  int size, int distance, int flags)
2050 {
2051  timestamp = wrap_timestamp(st, timestamp);
2053  &st->index_entries_allocated_size, pos,
2054  timestamp, size, distance, flags);
2055 }
2056 
2057 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
2058  int64_t wanted_timestamp, int flags)
2059 {
2060  int a, b, m;
2061  int64_t timestamp;
2062 
2063  a = -1;
2064  b = nb_entries;
2065 
2066  // Optimize appending index entries at the end.
2067  if (b && entries[b - 1].timestamp < wanted_timestamp)
2068  a = b - 1;
2069 
2070  while (b - a > 1) {
2071  m = (a + b) >> 1;
2072 
2073  // Search for the next non-discarded packet.
2074  while ((entries[m].flags & AVINDEX_DISCARD_FRAME) && m < b && m < nb_entries - 1) {
2075  m++;
2076  if (m == b && entries[m].timestamp >= wanted_timestamp) {
2077  m = b - 1;
2078  break;
2079  }
2080  }
2081 
2082  timestamp = entries[m].timestamp;
2083  if (timestamp >= wanted_timestamp)
2084  b = m;
2085  if (timestamp <= wanted_timestamp)
2086  a = m;
2087  }
2088  m = (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
2089 
2090  if (!(flags & AVSEEK_FLAG_ANY))
2091  while (m >= 0 && m < nb_entries &&
2092  !(entries[m].flags & AVINDEX_KEYFRAME))
2093  m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
2094 
2095  if (m == nb_entries)
2096  return -1;
2097  return m;
2098 }
2099 
2100 void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
2101 {
2102  int ist1, ist2;
2103  int64_t pos_delta = 0;
2104  int64_t skip = 0;
2105  //We could use URLProtocol flags here but as many user applications do not use URLProtocols this would be unreliable
2106  const char *proto = avio_find_protocol_name(s->url);
2107 
2108  if (!proto) {
2109  av_log(s, AV_LOG_INFO,
2110  "Protocol name not provided, cannot determine if input is local or "
2111  "a network protocol, buffers and access patterns cannot be configured "
2112  "optimally without knowing the protocol\n");
2113  }
2114 
2115  if (proto && !(strcmp(proto, "file") && strcmp(proto, "pipe") && strcmp(proto, "cache")))
2116  return;
2117 
2118  for (ist1 = 0; ist1 < s->nb_streams; ist1++) {
2119  AVStream *st1 = s->streams[ist1];
2120  for (ist2 = 0; ist2 < s->nb_streams; ist2++) {
2121  AVStream *st2 = s->streams[ist2];
2122  int i1, i2;
2123 
2124  if (ist1 == ist2)
2125  continue;
2126 
2127  for (i1 = i2 = 0; i1 < st1->nb_index_entries; i1++) {
2128  AVIndexEntry *e1 = &st1->index_entries[i1];
2129  int64_t e1_pts = av_rescale_q(e1->timestamp, st1->time_base, AV_TIME_BASE_Q);
2130 
2131  skip = FFMAX(skip, e1->size);
2132  for (; i2 < st2->nb_index_entries; i2++) {
2133  AVIndexEntry *e2 = &st2->index_entries[i2];
2134  int64_t e2_pts = av_rescale_q(e2->timestamp, st2->time_base, AV_TIME_BASE_Q);
2135  if (e2_pts - e1_pts < time_tolerance)
2136  continue;
2137  pos_delta = FFMAX(pos_delta, e1->pos - e2->pos);
2138  break;
2139  }
2140  }
2141  }
2142  }
2143 
2144  pos_delta *= 2;
2145  /* XXX This could be adjusted depending on protocol*/
2146  if (s->pb->buffer_size < pos_delta && pos_delta < (1<<24)) {
2147  av_log(s, AV_LOG_VERBOSE, "Reconfiguring buffers to size %"PRId64"\n", pos_delta);
2148 
2149  /* realloc the buffer and the original data will be retained */
2150  if (ffio_realloc_buf(s->pb, pos_delta)) {
2151  av_log(s, AV_LOG_ERROR, "Realloc buffer fail.\n");
2152  return;
2153  }
2154 
2155  s->pb->short_seek_threshold = FFMAX(s->pb->short_seek_threshold, pos_delta/2);
2156  }
2157 
2158  if (skip < (1<<23)) {
2160  }
2161 }
2162 
2163 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp, int flags)
2164 {
2166  wanted_timestamp, flags);
2167 }
2168 
2169 static int64_t ff_read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit,
2170  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2171 {
2172  int64_t ts = read_timestamp(s, stream_index, ppos, pos_limit);
2173  if (stream_index >= 0)
2174  ts = wrap_timestamp(s->streams[stream_index], ts);
2175  return ts;
2176 }
2177 
2178 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
2179  int64_t target_ts, int flags)
2180 {
2181  const AVInputFormat *avif = s->iformat;
2182  int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;
2183  int64_t ts_min, ts_max, ts;
2184  int index;
2185  int64_t ret;
2186  AVStream *st;
2187 
2188  if (stream_index < 0)
2189  return -1;
2190 
2191  av_log(s, AV_LOG_TRACE, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2192 
2193  ts_max =
2194  ts_min = AV_NOPTS_VALUE;
2195  pos_limit = -1; // GCC falsely says it may be uninitialized.
2196 
2197  st = s->streams[stream_index];
2198  if (st->index_entries) {
2199  AVIndexEntry *e;
2200 
2201  /* FIXME: Whole function must be checked for non-keyframe entries in
2202  * index case, especially read_timestamp(). */
2203  index = av_index_search_timestamp(st, target_ts,
2204  flags | AVSEEK_FLAG_BACKWARD);
2205  index = FFMAX(index, 0);
2206  e = &st->index_entries[index];
2207 
2208  if (e->timestamp <= target_ts || e->pos == e->min_distance) {
2209  pos_min = e->pos;
2210  ts_min = e->timestamp;
2211  av_log(s, AV_LOG_TRACE, "using cached pos_min=0x%"PRIx64" dts_min=%s\n",
2212  pos_min, av_ts2str(ts_min));
2213  } else {
2214  av_assert1(index == 0);
2215  }
2216 
2217  index = av_index_search_timestamp(st, target_ts,
2218  flags & ~AVSEEK_FLAG_BACKWARD);
2219  av_assert0(index < st->nb_index_entries);
2220  if (index >= 0) {
2221  e = &st->index_entries[index];
2222  av_assert1(e->timestamp >= target_ts);
2223  pos_max = e->pos;
2224  ts_max = e->timestamp;
2225  pos_limit = pos_max - e->min_distance;
2226  av_log(s, AV_LOG_TRACE, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64
2227  " dts_max=%s\n", pos_max, pos_limit, av_ts2str(ts_max));
2228  }
2229  }
2230 
2231  pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
2232  ts_min, ts_max, flags, &ts, avif->read_timestamp);
2233  if (pos < 0)
2234  return -1;
2235 
2236  /* do the seek */
2237  if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
2238  return ret;
2239 
2241  ff_update_cur_dts(s, st, ts);
2242 
2243  return 0;
2244 }
2245 
2246 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
2247  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
2248 {
2249  int64_t step = 1024;
2250  int64_t limit, ts_max;
2251  int64_t filesize = avio_size(s->pb);
2252  int64_t pos_max = filesize - 1;
2253  do {
2254  limit = pos_max;
2255  pos_max = FFMAX(0, (pos_max) - step);
2256  ts_max = ff_read_timestamp(s, stream_index,
2257  &pos_max, limit, read_timestamp);
2258  step += step;
2259  } while (ts_max == AV_NOPTS_VALUE && 2*limit > step);
2260  if (ts_max == AV_NOPTS_VALUE)
2261  return -1;
2262 
2263  for (;;) {
2264  int64_t tmp_pos = pos_max + 1;
2265  int64_t tmp_ts = ff_read_timestamp(s, stream_index,
2266  &tmp_pos, INT64_MAX, read_timestamp);
2267  if (tmp_ts == AV_NOPTS_VALUE)
2268  break;
2269  av_assert0(tmp_pos > pos_max);
2270  ts_max = tmp_ts;
2271  pos_max = tmp_pos;
2272  if (tmp_pos >= filesize)
2273  break;
2274  }
2275 
2276  if (ts)
2277  *ts = ts_max;
2278  if (pos)
2279  *pos = pos_max;
2280 
2281  return 0;
2282 }
2283 
2284 int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts,
2285  int64_t pos_min, int64_t pos_max, int64_t pos_limit,
2286  int64_t ts_min, int64_t ts_max,
2287  int flags, int64_t *ts_ret,
2288  int64_t (*read_timestamp)(struct AVFormatContext *, int,
2289  int64_t *, int64_t))
2290 {
2291  int64_t pos, ts;
2292  int64_t start_pos;
2293  int no_change;
2294  int ret;
2295 
2296  av_log(s, AV_LOG_TRACE, "gen_seek: %d %s\n", stream_index, av_ts2str(target_ts));
2297 
2298  if (ts_min == AV_NOPTS_VALUE) {
2299  pos_min = s->internal->data_offset;
2300  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2301  if (ts_min == AV_NOPTS_VALUE)
2302  return -1;
2303  }
2304 
2305  if (ts_min >= target_ts) {
2306  *ts_ret = ts_min;
2307  return pos_min;
2308  }
2309 
2310  if (ts_max == AV_NOPTS_VALUE) {
2311  if ((ret = ff_find_last_ts(s, stream_index, &ts_max, &pos_max, read_timestamp)) < 0)
2312  return ret;
2313  pos_limit = pos_max;
2314  }
2315 
2316  if (ts_max <= target_ts) {
2317  *ts_ret = ts_max;
2318  return pos_max;
2319  }
2320 
2321  av_assert0(ts_min < ts_max);
2322 
2323  no_change = 0;
2324  while (pos_min < pos_limit) {
2325  av_log(s, AV_LOG_TRACE,
2326  "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%s dts_max=%s\n",
2327  pos_min, pos_max, av_ts2str(ts_min), av_ts2str(ts_max));
2328  av_assert0(pos_limit <= pos_max);
2329 
2330  if (no_change == 0) {
2331  int64_t approximate_keyframe_distance = pos_max - pos_limit;
2332  // interpolate position (better than dichotomy)
2333  pos = av_rescale(target_ts - ts_min, pos_max - pos_min,
2334  ts_max - ts_min) +
2335  pos_min - approximate_keyframe_distance;
2336  } else if (no_change == 1) {
2337  // bisection if interpolation did not change min / max pos last time
2338  pos = (pos_min + pos_limit) >> 1;
2339  } else {
2340  /* linear search if bisection failed, can only happen if there
2341  * are very few or no keyframes between min/max */
2342  pos = pos_min;
2343  }
2344  if (pos <= pos_min)
2345  pos = pos_min + 1;
2346  else if (pos > pos_limit)
2347  pos = pos_limit;
2348  start_pos = pos;
2349 
2350  // May pass pos_limit instead of -1.
2351  ts = ff_read_timestamp(s, stream_index, &pos, INT64_MAX, read_timestamp);
2352  if (pos == pos_max)
2353  no_change++;
2354  else
2355  no_change = 0;
2356  av_log(s, AV_LOG_TRACE, "%"PRId64" %"PRId64" %"PRId64" / %s %s %s"
2357  " target:%s limit:%"PRId64" start:%"PRId64" noc:%d\n",
2358  pos_min, pos, pos_max,
2359  av_ts2str(ts_min), av_ts2str(ts), av_ts2str(ts_max), av_ts2str(target_ts),
2360  pos_limit, start_pos, no_change);
2361  if (ts == AV_NOPTS_VALUE) {
2362  av_log(s, AV_LOG_ERROR, "read_timestamp() failed in the middle\n");
2363  return -1;
2364  }
2365  if (target_ts <= ts) {
2366  pos_limit = start_pos - 1;
2367  pos_max = pos;
2368  ts_max = ts;
2369  }
2370  if (target_ts >= ts) {
2371  pos_min = pos;
2372  ts_min = ts;
2373  }
2374  }
2375 
2376  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
2377  ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
2378 #if 0
2379  pos_min = pos;
2380  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2381  pos_min++;
2382  ts_max = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
2383  av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" %s<=%s<=%s\n",
2384  pos, av_ts2str(ts_min), av_ts2str(target_ts), av_ts2str(ts_max));
2385 #endif
2386  *ts_ret = ts;
2387  return pos;
2388 }
2389 
2390 static int seek_frame_byte(AVFormatContext *s, int stream_index,
2391  int64_t pos, int flags)
2392 {
2393  int64_t pos_min, pos_max;
2394 
2395  pos_min = s->internal->data_offset;
2396  pos_max = avio_size(s->pb) - 1;
2397 
2398  if (pos < pos_min)
2399  pos = pos_min;
2400  else if (pos > pos_max)
2401  pos = pos_max;
2402 
2403  avio_seek(s->pb, pos, SEEK_SET);
2404 
2405  s->io_repositioned = 1;
2406 
2407  return 0;
2408 }
2409 
2410 static int seek_frame_generic(AVFormatContext *s, int stream_index,
2411  int64_t timestamp, int flags)
2412 {
2413  int index;
2414  int64_t ret;
2415  AVStream *st;
2416  AVIndexEntry *ie;
2417 
2418  st = s->streams[stream_index];
2419 
2420  index = av_index_search_timestamp(st, timestamp, flags);
2421 
2422  if (index < 0 && st->nb_index_entries &&
2423  timestamp < st->index_entries[0].timestamp)
2424  return -1;
2425 
2426  if (index < 0 || index == st->nb_index_entries - 1) {
2427  AVPacket pkt;
2428  int nonkey = 0;
2429 
2430  if (st->nb_index_entries) {
2432  ie = &st->index_entries[st->nb_index_entries - 1];
2433  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2434  return ret;
2435  ff_update_cur_dts(s, st, ie->timestamp);
2436  } else {
2437  if ((ret = avio_seek(s->pb, s->internal->data_offset, SEEK_SET)) < 0)
2438  return ret;
2439  }
2440  for (;;) {
2441  int read_status;
2442  do {
2443  read_status = av_read_frame(s, &pkt);
2444  } while (read_status == AVERROR(EAGAIN));
2445  if (read_status < 0)
2446  break;
2447  if (stream_index == pkt.stream_index && pkt.dts > timestamp) {
2448  if (pkt.flags & AV_PKT_FLAG_KEY) {
2449  av_packet_unref(&pkt);
2450  break;
2451  }
2452  if (nonkey++ > 1000 && st->codecpar->codec_id != AV_CODEC_ID_CDGRAPHICS) {
2453  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);
2454  av_packet_unref(&pkt);
2455  break;
2456  }
2457  }
2458  av_packet_unref(&pkt);
2459  }
2460  index = av_index_search_timestamp(st, timestamp, flags);
2461  }
2462  if (index < 0)
2463  return -1;
2464 
2466  if (s->iformat->read_seek)
2467  if (s->iformat->read_seek(s, stream_index, timestamp, flags) >= 0)
2468  return 0;
2469  ie = &st->index_entries[index];
2470  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2471  return ret;
2472  ff_update_cur_dts(s, st, ie->timestamp);
2473 
2474  return 0;
2475 }
2476 
2477 static int seek_frame_internal(AVFormatContext *s, int stream_index,
2478  int64_t timestamp, int flags)
2479 {
2480  int ret;
2481  AVStream *st;
2482 
2483  if (flags & AVSEEK_FLAG_BYTE) {
2484  if (s->iformat->flags & AVFMT_NO_BYTE_SEEK)
2485  return -1;
2487  return seek_frame_byte(s, stream_index, timestamp, flags);
2488  }
2489 
2490  if (stream_index < 0) {
2491  stream_index = av_find_default_stream_index(s);
2492  if (stream_index < 0)
2493  return -1;
2494 
2495  st = s->streams[stream_index];
2496  /* timestamp for default must be expressed in AV_TIME_BASE units */
2497  timestamp = av_rescale(timestamp, st->time_base.den,
2498  AV_TIME_BASE * (int64_t) st->time_base.num);
2499  }
2500 
2501  /* first, we try the format specific seek */
2502  if (s->iformat->read_seek) {
2504  ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
2505  } else
2506  ret = -1;
2507  if (ret >= 0)
2508  return 0;
2509 
2510  if (s->iformat->read_timestamp &&
2511  !(s->iformat->flags & AVFMT_NOBINSEARCH)) {
2513  return ff_seek_frame_binary(s, stream_index, timestamp, flags);
2514  } else if (!(s->iformat->flags & AVFMT_NOGENSEARCH)) {
2516  return seek_frame_generic(s, stream_index, timestamp, flags);
2517  } else
2518  return -1;
2519 }
2520 
2521 int av_seek_frame(AVFormatContext *s, int stream_index,
2522  int64_t timestamp, int flags)
2523 {
2524  int ret;
2525 
2526  if (s->iformat->read_seek2 && !s->iformat->read_seek) {
2527  int64_t min_ts = INT64_MIN, max_ts = INT64_MAX;
2528  if ((flags & AVSEEK_FLAG_BACKWARD))
2529  max_ts = timestamp;
2530  else
2531  min_ts = timestamp;
2532  return avformat_seek_file(s, stream_index, min_ts, timestamp, max_ts,
2533  flags & ~AVSEEK_FLAG_BACKWARD);
2534  }
2535 
2536  ret = seek_frame_internal(s, stream_index, timestamp, flags);
2537 
2538  if (ret >= 0)
2540 
2541  return ret;
2542 }
2543 
2544 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
2545  int64_t ts, int64_t max_ts, int flags)
2546 {
2547  if (min_ts > ts || max_ts < ts)
2548  return -1;
2549  if (stream_index < -1 || stream_index >= (int)s->nb_streams)
2550  return AVERROR(EINVAL);
2551 
2552  if (s->seek2any>0)
2553  flags |= AVSEEK_FLAG_ANY;
2554  flags &= ~AVSEEK_FLAG_BACKWARD;
2555 
2556  if (s->iformat->read_seek2) {
2557  int ret;
2559 
2560  if (stream_index == -1 && s->nb_streams == 1) {
2561  AVRational time_base = s->streams[0]->time_base;
2562  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
2563  min_ts = av_rescale_rnd(min_ts, time_base.den,
2564  time_base.num * (int64_t)AV_TIME_BASE,
2566  max_ts = av_rescale_rnd(max_ts, time_base.den,
2567  time_base.num * (int64_t)AV_TIME_BASE,
2569  stream_index = 0;
2570  }
2571 
2572  ret = s->iformat->read_seek2(s, stream_index, min_ts,
2573  ts, max_ts, flags);
2574 
2575  if (ret >= 0)
2577  return ret;
2578  }
2579 
2580  if (s->iformat->read_timestamp) {
2581  // try to seek via read_timestamp()
2582  }
2583 
2584  // Fall back on old API if new is not implemented but old is.
2585  // Note the old API has somewhat different semantics.
2586  if (s->iformat->read_seek || 1) {
2587  int dir = (ts - (uint64_t)min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);
2588  int ret = av_seek_frame(s, stream_index, ts, flags | dir);
2589  if (ret<0 && ts != min_ts && max_ts != ts) {
2590  ret = av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);
2591  if (ret >= 0)
2592  ret = av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));
2593  }
2594  return ret;
2595  }
2596 
2597  // try some generic seek like seek_frame_generic() but with new ts semantics
2598  return -1; //unreachable
2599 }
2600 
2602 {
2604  return 0;
2605 }
2606 
2607 /*******************************************************/
2608 
2609 /**
2610  * Return TRUE if the stream has accurate duration in any stream.
2611  *
2612  * @return TRUE if the stream has accurate duration for at least one component.
2613  */
2615 {
2616  int i;
2617  AVStream *st;
2618 
2619  for (i = 0; i < ic->nb_streams; i++) {
2620  st = ic->streams[i];
2621  if (st->duration != AV_NOPTS_VALUE)
2622  return 1;
2623  }
2624  if (ic->duration != AV_NOPTS_VALUE)
2625  return 1;
2626  return 0;
2627 }
2628 
2629 /**
2630  * Estimate the stream timings from the one of each components.
2631  *
2632  * Also computes the global bitrate if possible.
2633  */
2635 {
2636  int64_t start_time, start_time1, start_time_text, end_time, end_time1, end_time_text;
2637  int64_t duration, duration1, duration_text, filesize;
2638  int i;
2639  AVProgram *p;
2640 
2641  start_time = INT64_MAX;
2642  start_time_text = INT64_MAX;
2643  end_time = INT64_MIN;
2644  end_time_text = INT64_MIN;
2645  duration = INT64_MIN;
2646  duration_text = INT64_MIN;
2647 
2648  for (i = 0; i < ic->nb_streams; i++) {
2649  AVStream *st = ic->streams[i];
2650  int is_text = st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ||
2652  if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
2653  start_time1 = av_rescale_q(st->start_time, st->time_base,
2654  AV_TIME_BASE_Q);
2655  if (is_text)
2656  start_time_text = FFMIN(start_time_text, start_time1);
2657  else
2658  start_time = FFMIN(start_time, start_time1);
2659  end_time1 = av_rescale_q_rnd(st->duration, st->time_base,
2662  if (end_time1 != AV_NOPTS_VALUE && (end_time1 > 0 ? start_time1 <= INT64_MAX - end_time1 : start_time1 >= INT64_MIN - end_time1)) {
2663  end_time1 += start_time1;
2664  if (is_text)
2665  end_time_text = FFMAX(end_time_text, end_time1);
2666  else
2667  end_time = FFMAX(end_time, end_time1);
2668  }
2669  for (p = NULL; (p = av_find_program_from_stream(ic, p, i)); ) {
2670  if (p->start_time == AV_NOPTS_VALUE || p->start_time > start_time1)
2671  p->start_time = start_time1;
2672  if (p->end_time < end_time1)
2673  p->end_time = end_time1;
2674  }
2675  }
2676  if (st->duration != AV_NOPTS_VALUE) {
2677  duration1 = av_rescale_q(st->duration, st->time_base,
2678  AV_TIME_BASE_Q);
2679  if (is_text)
2680  duration_text = FFMAX(duration_text, duration1);
2681  else
2682  duration = FFMAX(duration, duration1);
2683  }
2684  }
2685  if (start_time == INT64_MAX || (start_time > start_time_text && start_time - (uint64_t)start_time_text < AV_TIME_BASE))
2686  start_time = start_time_text;
2687  else if (start_time > start_time_text)
2688  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream starttime %f\n", start_time_text / (float)AV_TIME_BASE);
2689 
2690  if (end_time == INT64_MIN || (end_time < end_time_text && end_time_text - (uint64_t)end_time < AV_TIME_BASE))
2691  end_time = end_time_text;
2692  else if (end_time < end_time_text)
2693  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream endtime %f\n", end_time_text / (float)AV_TIME_BASE);
2694 
2695  if (duration == INT64_MIN || (duration < duration_text && duration_text - duration < AV_TIME_BASE))
2696  duration = duration_text;
2697  else if (duration < duration_text)
2698  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream duration %f\n", duration_text / (float)AV_TIME_BASE);
2699 
2700  if (start_time != INT64_MAX) {
2701  ic->start_time = start_time;
2702  if (end_time != INT64_MIN) {
2703  if (ic->nb_programs > 1) {
2704  for (i = 0; i < ic->nb_programs; i++) {
2705  p = ic->programs[i];
2706  if (p->start_time != AV_NOPTS_VALUE &&
2707  p->end_time > p->start_time &&
2708  p->end_time - (uint64_t)p->start_time <= INT64_MAX)
2709  duration = FFMAX(duration, p->end_time - p->start_time);
2710  }
2711  } else if (end_time >= start_time && end_time - (uint64_t)start_time <= INT64_MAX) {
2712  duration = FFMAX(duration, end_time - start_time);
2713  }
2714  }
2715  }
2716  if (duration != INT64_MIN && duration > 0 && ic->duration == AV_NOPTS_VALUE) {
2717  ic->duration = duration;
2718  }
2719  if (ic->pb && (filesize = avio_size(ic->pb)) > 0 && ic->duration > 0) {
2720  /* compute the bitrate */
2721  double bitrate = (double) filesize * 8.0 * AV_TIME_BASE /
2722  (double) ic->duration;
2723  if (bitrate >= 0 && bitrate <= INT64_MAX)
2724  ic->bit_rate = bitrate;
2725  }
2726 }
2727 
2729 {
2730  int i;
2731  AVStream *st;
2732 
2734  for (i = 0; i < ic->nb_streams; i++) {
2735  st = ic->streams[i];
2736  if (st->start_time == AV_NOPTS_VALUE) {
2737  if (ic->start_time != AV_NOPTS_VALUE)
2739  st->time_base);
2740  if (ic->duration != AV_NOPTS_VALUE)
2742  st->time_base);
2743  }
2744  }
2745 }
2746 
2748 {
2749  int64_t filesize, duration;
2750  int i, show_warning = 0;
2751  AVStream *st;
2752 
2753  /* if bit_rate is already set, we believe it */
2754  if (ic->bit_rate <= 0) {
2755  int64_t bit_rate = 0;
2756  for (i = 0; i < ic->nb_streams; i++) {
2757  st = ic->streams[i];
2758  if (st->codecpar->bit_rate <= 0 && st->internal->avctx->bit_rate > 0)
2759  st->codecpar->bit_rate = st->internal->avctx->bit_rate;
2760  if (st->codecpar->bit_rate > 0) {
2761  if (INT64_MAX - st->codecpar->bit_rate < bit_rate) {
2762  bit_rate = 0;
2763  break;
2764  }
2765  bit_rate += st->codecpar->bit_rate;
2766  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->codec_info_nb_frames > 1) {
2767  // If we have a videostream with packets but without a bitrate
2768  // then consider the sum not known
2769  bit_rate = 0;
2770  break;
2771  }
2772  }
2773  ic->bit_rate = bit_rate;
2774  }
2775 
2776  /* if duration is already set, we believe it */
2777  if (ic->duration == AV_NOPTS_VALUE &&
2778  ic->bit_rate != 0) {
2779  filesize = ic->pb ? avio_size(ic->pb) : 0;
2780  if (filesize > ic->internal->data_offset) {
2781  filesize -= ic->internal->data_offset;
2782  for (i = 0; i < ic->nb_streams; i++) {
2783  st = ic->streams[i];
2784  if ( st->time_base.num <= INT64_MAX / ic->bit_rate
2785  && st->duration == AV_NOPTS_VALUE) {
2786  duration = av_rescale(8 * filesize, st->time_base.den,
2787  ic->bit_rate *
2788  (int64_t) st->time_base.num);
2789  st->duration = duration;
2790  show_warning = 1;
2791  }
2792  }
2793  }
2794  }
2795  if (show_warning)
2796  av_log(ic, AV_LOG_WARNING,
2797  "Estimating duration from bitrate, this may be inaccurate\n");
2798 }
2799 
2800 #define DURATION_MAX_READ_SIZE 250000LL
2801 #define DURATION_MAX_RETRY 6
2802 
2803 /* only usable for MPEG-PS streams */
2804 static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
2805 {
2806  AVPacket pkt1, *pkt = &pkt1;
2807  AVStream *st;
2808  int num, den, read_size, i, ret;
2809  int found_duration = 0;
2810  int is_end;
2811  int64_t filesize, offset, duration;
2812  int retry = 0;
2813 
2814  /* flush packet queue */
2815  flush_packet_queue(ic);
2816 
2817  for (i = 0; i < ic->nb_streams; i++) {
2818  st = ic->streams[i];
2819  if (st->start_time == AV_NOPTS_VALUE &&
2820  st->first_dts == AV_NOPTS_VALUE &&
2822  av_log(ic, AV_LOG_WARNING,
2823  "start time for stream %d is not set in estimate_timings_from_pts\n", i);
2824 
2825  if (st->parser) {
2826  av_parser_close(st->parser);
2827  st->parser = NULL;
2828  }
2829  }
2830 
2832  av_log(ic, AV_LOG_INFO, "Skipping duration calculation in estimate_timings_from_pts\n");
2833  goto skip_duration_calc;
2834  }
2835 
2836  av_opt_set(ic, "skip_changes", "1", AV_OPT_SEARCH_CHILDREN);
2837  /* estimate the end time (duration) */
2838  /* XXX: may need to support wrapping */
2839  filesize = ic->pb ? avio_size(ic->pb) : 0;
2840  do {
2841  is_end = found_duration;
2842  offset = filesize - (DURATION_MAX_READ_SIZE << retry);
2843  if (offset < 0)
2844  offset = 0;
2845 
2846  avio_seek(ic->pb, offset, SEEK_SET);
2847  read_size = 0;
2848  for (;;) {
2849  if (read_size >= DURATION_MAX_READ_SIZE << (FFMAX(retry - 1, 0)))
2850  break;
2851 
2852  do {
2853  ret = ff_read_packet(ic, pkt);
2854  } while (ret == AVERROR(EAGAIN));
2855  if (ret != 0)
2856  break;
2857  read_size += pkt->size;
2858  st = ic->streams[pkt->stream_index];
2859  if (pkt->pts != AV_NOPTS_VALUE &&
2860  (st->start_time != AV_NOPTS_VALUE ||
2861  st->first_dts != AV_NOPTS_VALUE)) {
2862  if (pkt->duration == 0) {
2863  ff_compute_frame_duration(ic, &num, &den, st, st->parser, pkt);
2864  if (den && num) {
2865  pkt->duration = av_rescale_rnd(1,
2866  num * (int64_t) st->time_base.den,
2867  den * (int64_t) st->time_base.num,
2868  AV_ROUND_DOWN);
2869  }
2870  }
2871  duration = pkt->pts + pkt->duration;
2872  found_duration = 1;
2873  if (st->start_time != AV_NOPTS_VALUE)
2874  duration -= st->start_time;
2875  else
2876  duration -= st->first_dts;
2877  if (duration > 0) {
2878  if (st->duration == AV_NOPTS_VALUE || st->info->last_duration<= 0 ||
2879  (st->duration < duration && FFABS(duration - st->info->last_duration) < 60LL*st->time_base.den / st->time_base.num))
2880  st->duration = duration;
2881  st->info->last_duration = duration;
2882  }
2883  }
2884  av_packet_unref(pkt);
2885  }
2886 
2887  /* check if all audio/video streams have valid duration */
2888  if (!is_end) {
2889  is_end = 1;
2890  for (i = 0; i < ic->nb_streams; i++) {
2891  st = ic->streams[i];
2892  switch (st->codecpar->codec_type) {
2893  case AVMEDIA_TYPE_VIDEO:
2894  case AVMEDIA_TYPE_AUDIO:
2895  if (st->duration == AV_NOPTS_VALUE)
2896  is_end = 0;
2897  }
2898  }
2899  }
2900  } while (!is_end &&
2901  offset &&
2902  ++retry <= DURATION_MAX_RETRY);
2903 
2904  av_opt_set(ic, "skip_changes", "0", AV_OPT_SEARCH_CHILDREN);
2905 
2906  /* warn about audio/video streams which duration could not be estimated */
2907  for (i = 0; i < ic->nb_streams; i++) {
2908  st = ic->streams[i];
2909  if (st->duration == AV_NOPTS_VALUE) {
2910  switch (st->codecpar->codec_type) {
2911  case AVMEDIA_TYPE_VIDEO:
2912  case AVMEDIA_TYPE_AUDIO:
2913  if (st->start_time != AV_NOPTS_VALUE || st->first_dts != AV_NOPTS_VALUE) {
2914  av_log(ic, AV_LOG_WARNING, "stream %d : no PTS found at end of file, duration not set\n", i);
2915  } else
2916  av_log(ic, AV_LOG_WARNING, "stream %d : no TS found at start of file, duration not set\n", i);
2917  }
2918  }
2919  }
2920 skip_duration_calc:
2922 
2923  avio_seek(ic->pb, old_offset, SEEK_SET);
2924  for (i = 0; i < ic->nb_streams; i++) {
2925  int j;
2926 
2927  st = ic->streams[i];
2928  st->cur_dts = st->first_dts;
2931  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
2932  st->pts_buffer[j] = AV_NOPTS_VALUE;
2933  }
2934 }
2935 
2936 /* 1:1 map to AVDurationEstimationMethod */
2937 static const char *duration_name[] = {
2938  [AVFMT_DURATION_FROM_PTS] = "pts",
2939  [AVFMT_DURATION_FROM_STREAM] = "stream",
2940  [AVFMT_DURATION_FROM_BITRATE] = "bit rate",
2941 };
2942 
2944 {
2945  return duration_name[method];
2946 }
2947 
2948 static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
2949 {
2950  int64_t file_size;
2951 
2952  /* get the file size, if possible */
2953  if (ic->iformat->flags & AVFMT_NOFILE) {
2954  file_size = 0;
2955  } else {
2956  file_size = avio_size(ic->pb);
2957  file_size = FFMAX(0, file_size);
2958  }
2959 
2960  if ((!strcmp(ic->iformat->name, "mpeg") ||
2961  !strcmp(ic->iformat->name, "mpegts")) &&
2962  file_size && (ic->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
2963  /* get accurate estimate from the PTSes */
2964  estimate_timings_from_pts(ic, old_offset);
2966  } else if (has_duration(ic)) {
2967  /* at least one component has timings - we use them for all
2968  * the components */
2970  /* nut demuxer estimate the duration from PTS */
2971  if(!strcmp(ic->iformat->name, "nut"))
2973  else
2975  } else {
2976  /* less precise: use bitrate info */
2979  }
2981 
2982  {
2983  int i;
2984  AVStream av_unused *st;
2985  for (i = 0; i < ic->nb_streams; i++) {
2986  st = ic->streams[i];
2987  if (st->time_base.den)
2988  av_log(ic, AV_LOG_TRACE, "stream %d: start_time: %0.3f duration: %0.3f\n", i,
2989  (double) st->start_time * av_q2d(st->time_base),
2990  (double) st->duration * av_q2d(st->time_base));
2991  }
2992  av_log(ic, AV_LOG_TRACE,
2993  "format: start_time: %0.3f duration: %0.3f (estimate from %s) bitrate=%"PRId64" kb/s\n",
2994  (double) ic->start_time / AV_TIME_BASE,
2995  (double) ic->duration / AV_TIME_BASE,
2997  (int64_t)ic->bit_rate / 1000);
2998  }
2999 }
3000 
3001 static int has_codec_parameters(AVStream *st, const char **errmsg_ptr)
3002 {
3003  AVCodecContext *avctx = st->internal->avctx;
3004 
3005 #define FAIL(errmsg) do { \
3006  if (errmsg_ptr) \
3007  *errmsg_ptr = errmsg; \
3008  return 0; \
3009  } while (0)
3010 
3011  if ( avctx->codec_id == AV_CODEC_ID_NONE
3012  && avctx->codec_type != AVMEDIA_TYPE_DATA)
3013  FAIL("unknown codec");
3014  switch (avctx->codec_type) {
3015  case AVMEDIA_TYPE_AUDIO:
3016  if (!avctx->frame_size && determinable_frame_size(avctx))
3017  FAIL("unspecified frame size");
3018  if (st->info->found_decoder >= 0 &&
3019  avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
3020  FAIL("unspecified sample format");
3021  if (!avctx->sample_rate)
3022  FAIL("unspecified sample rate");
3023  if (!avctx->channels)
3024  FAIL("unspecified number of channels");
3025  if (st->info->found_decoder >= 0 && !st->nb_decoded_frames && avctx->codec_id == AV_CODEC_ID_DTS)
3026  FAIL("no decodable DTS frames");
3027  break;
3028  case AVMEDIA_TYPE_VIDEO:
3029  if (!avctx->width)
3030  FAIL("unspecified size");
3031  if (st->info->found_decoder >= 0 && avctx->pix_fmt == AV_PIX_FMT_NONE)
3032  FAIL("unspecified pixel format");
3035  FAIL("no frame in rv30/40 and no sar");
3036  break;
3037  case AVMEDIA_TYPE_SUBTITLE:
3038  if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
3039  FAIL("unspecified size");
3040  break;
3041  case AVMEDIA_TYPE_DATA:
3042  if (avctx->codec_id == AV_CODEC_ID_NONE) return 1;
3043  }
3044 
3045  return 1;
3046 }
3047 
3048 /* returns 1 or 0 if or if not decoded data was returned, or a negative error */
3050  const AVPacket *avpkt, AVDictionary **options)
3051 {
3052  AVCodecContext *avctx = st->internal->avctx;
3053  const AVCodec *codec;
3054  int got_picture = 1, ret = 0;
3056  AVSubtitle subtitle;
3057  AVPacket pkt = *avpkt;
3058  int do_skip_frame = 0;
3059  enum AVDiscard skip_frame;
3060 
3061  if (!frame)
3062  return AVERROR(ENOMEM);
3063 
3064  if (!avcodec_is_open(avctx) &&
3065  st->info->found_decoder <= 0 &&
3066  (st->codecpar->codec_id != -st->info->found_decoder || !st->codecpar->codec_id)) {
3067  AVDictionary *thread_opt = NULL;
3068 
3069  codec = find_probe_decoder(s, st, st->codecpar->codec_id);
3070 
3071  if (!codec) {
3072  st->info->found_decoder = -st->codecpar->codec_id;
3073  ret = -1;
3074  goto fail;
3075  }
3076 
3077  /* Force thread count to 1 since the H.264 decoder will not extract
3078  * SPS and PPS to extradata during multi-threaded decoding. */
3079  av_dict_set(options ? options : &thread_opt, "threads", "1", 0);
3080  if (s->codec_whitelist)
3081  av_dict_set(options ? options : &thread_opt, "codec_whitelist", s->codec_whitelist, 0);
3082  ret = avcodec_open2(avctx, codec, options ? options : &thread_opt);
3083  if (!options)
3084  av_dict_free(&thread_opt);
3085  if (ret < 0) {
3086  st->info->found_decoder = -avctx->codec_id;
3087  goto fail;
3088  }
3089  st->info->found_decoder = 1;
3090  } else if (!st->info->found_decoder)
3091  st->info->found_decoder = 1;
3092 
3093  if (st->info->found_decoder < 0) {
3094  ret = -1;
3095  goto fail;
3096  }
3097 
3099  do_skip_frame = 1;
3100  skip_frame = avctx->skip_frame;
3101  avctx->skip_frame = AVDISCARD_ALL;
3102  }
3103 
3104  while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
3105  ret >= 0 &&
3107  (!st->codec_info_nb_frames &&
3109  got_picture = 0;
3110  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
3111  avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
3112  ret = avcodec_send_packet(avctx, &pkt);
3113  if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3114  break;
3115  if (ret >= 0)
3116  pkt.size = 0;
3117  ret = avcodec_receive_frame(avctx, frame);
3118  if (ret >= 0)
3119  got_picture = 1;
3120  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
3121  ret = 0;
3122  } else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
3123  ret = avcodec_decode_subtitle2(avctx, &subtitle,
3124  &got_picture, &pkt);
3125  if (ret >= 0)
3126  pkt.size = 0;
3127  }
3128  if (ret >= 0) {
3129  if (got_picture)
3130  st->nb_decoded_frames++;
3131  ret = got_picture;
3132  }
3133  }
3134 
3135  if (!pkt.data && !got_picture)
3136  ret = -1;
3137 
3138 fail:
3139  if (do_skip_frame) {
3140  avctx->skip_frame = skip_frame;
3141  }
3142 
3143  av_frame_free(&frame);
3144  return ret;
3145 }
3146 
3147 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
3148 {
3149  while (tags->id != AV_CODEC_ID_NONE) {
3150  if (tags->id == id)
3151  return tags->tag;
3152  tags++;
3153  }
3154  return 0;
3155 }
3156 
3157 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
3158 {
3159  int i;
3160  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3161  if (tag == tags[i].tag)
3162  return tags[i].id;
3163  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
3164  if (avpriv_toupper4(tag) == avpriv_toupper4(tags[i].tag))
3165  return tags[i].id;
3166  return AV_CODEC_ID_NONE;
3167 }
3168 
3169 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
3170 {
3171  if (bps <= 0 || bps > 64)
3172  return AV_CODEC_ID_NONE;
3173 
3174  if (flt) {
3175  switch (bps) {
3176  case 32:
3178  case 64:
3180  default:
3181  return AV_CODEC_ID_NONE;
3182  }
3183  } else {
3184  bps += 7;
3185  bps >>= 3;
3186  if (sflags & (1 << (bps - 1))) {
3187  switch (bps) {
3188  case 1:
3189  return AV_CODEC_ID_PCM_S8;
3190  case 2:
3192  case 3:
3194  case 4:
3196  case 8:
3198  default:
3199  return AV_CODEC_ID_NONE;
3200  }
3201  } else {
3202  switch (bps) {
3203  case 1:
3204  return AV_CODEC_ID_PCM_U8;
3205  case 2:
3207  case 3:
3209  case 4:
3211  default:
3212  return AV_CODEC_ID_NONE;
3213  }
3214  }
3215  }
3216 }
3217 
3218 unsigned int av_codec_get_tag(const AVCodecTag *const *tags, enum AVCodecID id)
3219 {
3220  unsigned int tag;
3221  if (!av_codec_get_tag2(tags, id, &tag))
3222  return 0;
3223  return tag;
3224 }
3225 
3226 int av_codec_get_tag2(const AVCodecTag * const *tags, enum AVCodecID id,
3227  unsigned int *tag)
3228 {
3229  int i;
3230  for (i = 0; tags && tags[i]; i++) {
3231  const AVCodecTag *codec_tags = tags[i];
3232  while (codec_tags->id != AV_CODEC_ID_NONE) {
3233  if (codec_tags->id == id) {
3234  *tag = codec_tags->tag;
3235  return 1;
3236  }
3237  codec_tags++;
3238  }
3239  }
3240  return 0;
3241 }
3242 
3243 enum AVCodecID av_codec_get_id(const AVCodecTag *const *tags, unsigned int tag)
3244 {
3245  int i;
3246  for (i = 0; tags && tags[i]; i++) {
3247  enum AVCodecID id = ff_codec_get_id(tags[i], tag);
3248  if (id != AV_CODEC_ID_NONE)
3249  return id;
3250  }
3251  return AV_CODEC_ID_NONE;
3252 }
3253 
3255 {
3256  unsigned int i, j;
3257  int64_t max_time = 0;
3258 
3259  if (s->duration > 0 && s->start_time < INT64_MAX - s->duration)
3260  max_time = s->duration +
3261  ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
3262 
3263  for (i = 0; i < s->nb_chapters; i++)
3264  if (s->chapters[i]->end == AV_NOPTS_VALUE) {
3265  AVChapter *ch = s->chapters[i];
3266  int64_t end = max_time ? av_rescale_q(max_time, AV_TIME_BASE_Q,
3267  ch->time_base)
3268  : INT64_MAX;
3269 
3270  for (j = 0; j < s->nb_chapters; j++) {
3271  AVChapter *ch1 = s->chapters[j];
3272  int64_t next_start = av_rescale_q(ch1->start, ch1->time_base,
3273  ch->time_base);
3274  if (j != i && next_start > ch->start && next_start < end)
3275  end = next_start;
3276  }
3277  ch->end = (end == INT64_MAX || end < ch->start) ? ch->start : end;
3278  }
3279 }
3280 
3281 static int get_std_framerate(int i)
3282 {
3283  if (i < 30*12)
3284  return (i + 1) * 1001;
3285  i -= 30*12;
3286 
3287  if (i < 30)
3288  return (i + 31) * 1001 * 12;
3289  i -= 30;
3290 
3291  if (i < 3)
3292  return ((const int[]) { 80, 120, 240})[i] * 1001 * 12;
3293 
3294  i -= 3;
3295 
3296  return ((const int[]) { 24, 30, 60, 12, 15, 48 })[i] * 1000 * 12;
3297 }
3298 
3299 /* Is the time base unreliable?
3300  * This is a heuristic to balance between quick acceptance of the values in
3301  * the headers vs. some extra checks.
3302  * Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
3303  * MPEG-2 commonly misuses field repeat flags to store different framerates.
3304  * And there are "variable" fps files this needs to detect as well. */
3306 {
3307  if (c->time_base.den >= 101LL * c->time_base.num ||
3308  c->time_base.den < 5LL * c->time_base.num ||
3309  // c->codec_tag == AV_RL32("DIVX") ||
3310  // c->codec_tag == AV_RL32("XVID") ||
3311  c->codec_tag == AV_RL32("mp4v") ||
3313  c->codec_id == AV_CODEC_ID_GIF ||
3314  c->codec_id == AV_CODEC_ID_HEVC ||
3315  c->codec_id == AV_CODEC_ID_H264)
3316  return 1;
3317  return 0;
3318 }
3319 
3321 {
3322  av_freep(&par->extradata);
3323  par->extradata_size = 0;
3324 
3326  return AVERROR(EINVAL);
3327 
3329  if (!par->extradata)
3330  return AVERROR(ENOMEM);
3331 
3332  memset(par->extradata + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3333  par->extradata_size = size;
3334 
3335  return 0;
3336 }
3337 
3339 {
3340  int ret = ff_alloc_extradata(par, size);
3341  if (ret < 0)
3342  return ret;
3343  ret = avio_read(pb, par->extradata, size);
3344  if (ret != size) {
3345  av_freep(&par->extradata);
3346  par->extradata_size = 0;
3347  av_log(s, AV_LOG_ERROR, "Failed to read extradata of size %d\n", size);
3348  return ret < 0 ? ret : AVERROR_INVALIDDATA;
3349  }
3350 
3351  return ret;
3352 }
3353 
3354 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
3355 {
3356  int i, j;
3357  int64_t last = st->info->last_dts;
3358 
3359  if ( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
3360  && ts - (uint64_t)last < INT64_MAX) {
3361  double dts = (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
3362  int64_t duration = ts - last;
3363 
3364  if (!st->info->duration_error)
3365  st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
3366  if (!st->info->duration_error)
3367  return AVERROR(ENOMEM);
3368 
3369 // if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
3370 // av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
3371  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3372  if (st->info->duration_error[0][1][i] < 1e10) {
3373  int framerate = get_std_framerate(i);
3374  double sdts = dts*framerate/(1001*12);
3375  for (j= 0; j<2; j++) {
3376  int64_t ticks = llrint(sdts+j*0.5);
3377  double error= sdts - ticks + j*0.5;
3378  st->info->duration_error[j][0][i] += error;
3379  st->info->duration_error[j][1][i] += error*error;
3380  }
3381  }
3382  }
3383  if (st->info->rfps_duration_sum <= INT64_MAX - duration) {
3384  st->info->duration_count++;
3386  }
3387 
3388  if (st->info->duration_count % 10 == 0) {
3389  int n = st->info->duration_count;
3390  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
3391  if (st->info->duration_error[0][1][i] < 1e10) {
3392  double a0 = st->info->duration_error[0][0][i] / n;
3393  double error0 = st->info->duration_error[0][1][i] / n - a0*a0;
3394  double a1 = st->info->duration_error[1][0][i] / n;
3395  double error1 = st->info->duration_error[1][1][i] / n - a1*a1;
3396  if (error0 > 0.04 && error1 > 0.04) {
3397  st->info->duration_error[0][1][i] = 2e10;
3398  st->info->duration_error[1][1][i] = 2e10;
3399  }
3400  }
3401  }
3402  }
3403 
3404  // ignore the first 4 values, they might have some random jitter
3405  if (st->info->duration_count > 3 && is_relative(ts) == is_relative(last))
3406  st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
3407  }
3408  if (ts != AV_NOPTS_VALUE)
3409  st->info->last_dts = ts;
3410 
3411  return 0;
3412 }
3413 
3415 {
3416  int i, j;
3417 
3418  for (i = 0; i < ic->nb_streams; i++) {
3419  AVStream *st = ic->streams[i];
3420 
3422  continue;
3423  // the check for tb_unreliable() is not completely correct, since this is not about handling
3424  // an unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
3425  // ipmovie.c produces.
3426  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)
3427  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);
3428  if (st->info->duration_count>1 && !st->r_frame_rate.num
3429  && tb_unreliable(st->internal->avctx)) {
3430  int num = 0;
3431  double best_error= 0.01;
3432  AVRational ref_rate = st->r_frame_rate.num ? st->r_frame_rate : av_inv_q(st->time_base);
3433 
3434  for (j= 0; j<MAX_STD_TIMEBASES; j++) {
3435  int k;
3436 
3437  if (st->info->codec_info_duration &&
3438  st->info->codec_info_duration*av_q2d(st->time_base) < (1001*11.5)/get_std_framerate(j))
3439  continue;
3440  if (!st->info->codec_info_duration && get_std_framerate(j) < 1001*12)
3441  continue;
3442 
3443  if (av_q2d(st->time_base) * st->info->rfps_duration_sum / st->info->duration_count < (1001*12.0 * 0.8)/get_std_framerate(j))
3444  continue;
3445 
3446  for (k= 0; k<2; k++) {
3447  int n = st->info->duration_count;
3448  double a= st->info->duration_error[k][0][j] / n;
3449  double error= st->info->duration_error[k][1][j]/n - a*a;
3450 
3451  if (error < best_error && best_error> 0.000000001) {
3452  best_error= error;
3453  num = get_std_framerate(j);
3454  }
3455  if (error < 0.02)
3456  av_log(ic, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
3457  }
3458  }
3459  // do not increase frame rate by more than 1 % in order to match a standard rate.
3460  if (num && (!ref_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(ref_rate)))
3461  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
3462  }
3463  if ( !st->avg_frame_rate.num
3464  && st->r_frame_rate.num && st->info->rfps_duration_sum
3465  && st->info->codec_info_duration <= 0
3466  && st->info->duration_count > 2
3467  && 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
3468  ) {
3469  av_log(ic, AV_LOG_DEBUG, "Setting avg frame rate based on r frame rate\n");
3470  st->avg_frame_rate = st->r_frame_rate;
3471  }
3472 
3473  av_freep(&st->info->duration_error);
3474  st->info->last_dts = AV_NOPTS_VALUE;
3475  st->info->duration_count = 0;
3476  st->info->rfps_duration_sum = 0;
3477  }
3478 }
3479 
3481 {
3482  const AVBitStreamFilter *f;
3483 
3484  f = av_bsf_get_by_name("extract_extradata");
3485  if (!f)
3486  return 0;
3487 
3488  if (f->codec_ids) {
3489  const enum AVCodecID *ids;
3490  for (ids = f->codec_ids; *ids != AV_CODEC_ID_NONE; ids++)
3491  if (*ids == st->codecpar->codec_id)
3492  return 1;
3493  }
3494 
3495  return 0;
3496 }
3497 
3499 {
3500  AVStreamInternal *sti = st->internal;
3501  const AVBitStreamFilter *f;
3502  int ret;
3503 
3504  f = av_bsf_get_by_name("extract_extradata");
3505  if (!f)
3506  goto finish;
3507 
3508  /* check that the codec id is supported */
3509  ret = extract_extradata_check(st);
3510  if (!ret)
3511  goto finish;
3512 
3514  if (!sti->extract_extradata.pkt)
3515  return AVERROR(ENOMEM);
3516 
3517  ret = av_bsf_alloc(f, &sti->extract_extradata.bsf);
3518  if (ret < 0)
3519  goto fail;
3520 
3522  st->codecpar);
3523  if (ret < 0)
3524  goto fail;
3525 
3527 
3528  ret = av_bsf_init(sti->extract_extradata.bsf);
3529  if (ret < 0)
3530  goto fail;
3531 
3532 finish:
3533  sti->extract_extradata.inited = 1;
3534 
3535  return 0;
3536 fail:
3539  return ret;
3540 }
3541 
3542 static int extract_extradata(AVStream *st, const AVPacket *pkt)
3543 {
3544  AVStreamInternal *sti = st->internal;
3545  AVPacket *pkt_ref;
3546  int ret;
3547 
3548  if (!sti->extract_extradata.inited) {
3549  ret = extract_extradata_init(st);
3550  if (ret < 0)
3551  return ret;
3552  }
3553 
3554  if (sti->extract_extradata.inited && !sti->extract_extradata.bsf)
3555  return 0;
3556 
3557  pkt_ref = sti->extract_extradata.pkt;
3558  ret = av_packet_ref(pkt_ref, pkt);
3559  if (ret < 0)
3560  return ret;
3561 
3562  ret = av_bsf_send_packet(sti->extract_extradata.bsf, pkt_ref);
3563  if (ret < 0) {
3564  av_packet_unref(pkt_ref);
3565  return ret;
3566  }
3567 
3568  while (ret >= 0 && !sti->avctx->extradata) {
3569  int extradata_size;
3570  uint8_t *extradata;
3571 
3572  ret = av_bsf_receive_packet(sti->extract_extradata.bsf, pkt_ref);
3573  if (ret < 0) {
3574  if (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
3575  return ret;
3576  continue;
3577  }
3578 
3580  &extradata_size);
3581 
3582  if (extradata) {
3583  av_assert0(!sti->avctx->extradata);
3584  if ((unsigned)extradata_size < FF_MAX_EXTRADATA_SIZE)
3585  sti->avctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
3586  if (!sti->avctx->extradata) {
3587  av_packet_unref(pkt_ref);
3588  return AVERROR(ENOMEM);
3589  }
3590  memcpy(sti->avctx->extradata, extradata, extradata_size);
3591  sti->avctx->extradata_size = extradata_size;
3592  }
3593  av_packet_unref(pkt_ref);
3594  }
3595 
3596  return 0;
3597 }
3598 
3600 {
3601  int i, count = 0, ret = 0, j;
3602  int64_t read_size;
3603  AVStream *st;
3604  AVCodecContext *avctx;
3605  AVPacket pkt1;
3606  int64_t old_offset = avio_tell(ic->pb);
3607  // new streams might appear, no options for those
3608  int orig_nb_streams = ic->nb_streams;
3609  int flush_codecs;
3610  int64_t max_analyze_duration = ic->max_analyze_duration;
3611  int64_t max_stream_analyze_duration;
3612  int64_t max_subtitle_analyze_duration;
3613  int64_t probesize = ic->probesize;
3614  int eof_reached = 0;
3615  int *missing_streams = av_opt_ptr(ic->iformat->priv_class, ic->priv_data, "missing_streams");
3616 
3617  flush_codecs = probesize > 0;
3618 
3619  av_opt_set(ic, "skip_clear", "1", AV_OPT_SEARCH_CHILDREN);
3620 
3621  max_stream_analyze_duration = max_analyze_duration;
3622  max_subtitle_analyze_duration = max_analyze_duration;
3623  if (!max_analyze_duration) {
3624  max_stream_analyze_duration =
3625  max_analyze_duration = 5*AV_TIME_BASE;
3626  max_subtitle_analyze_duration = 30*AV_TIME_BASE;
3627  if (!strcmp(ic->iformat->name, "flv"))
3628  max_stream_analyze_duration = 90*AV_TIME_BASE;
3629  if (!strcmp(ic->iformat->name, "mpeg") || !strcmp(ic->iformat->name, "mpegts"))
3630  max_stream_analyze_duration = 7*AV_TIME_BASE;
3631  }
3632 
3633  if (ic->pb)
3634  av_log(ic, AV_LOG_DEBUG, "Before avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d nb_streams:%d\n",
3635  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, ic->nb_streams);
3636 
3637  for (i = 0; i < ic->nb_streams; i++) {
3638  const AVCodec *codec;
3639  AVDictionary *thread_opt = NULL;
3640  st = ic->streams[i];
3641  avctx = st->internal->avctx;
3642 
3643  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
3645 /* if (!st->time_base.num)
3646  st->time_base = */
3647  if (!avctx->time_base.num)
3648  avctx->time_base = st->time_base;
3649  }
3650 
3651  /* check if the caller has overridden the codec id */
3652 #if FF_API_LAVF_AVCTX
3654  if (st->codec->codec_id != st->internal->orig_codec_id) {
3655  st->codecpar->codec_id = st->codec->codec_id;
3656  st->codecpar->codec_type = st->codec->codec_type;
3657  st->internal->orig_codec_id = st->codec->codec_id;
3658  }
3660 #endif
3661  // only for the split stuff
3662  if (!st->parser && !(ic->flags & AVFMT_FLAG_NOPARSE) && st->request_probe <= 0) {
3663  st->parser = av_parser_init(st->codecpar->codec_id);
3664  if (st->parser) {
3665  if (st->need_parsing == AVSTREAM_PARSE_HEADERS) {
3667  } else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW) {
3669  }
3670  } else if (st->need_parsing) {
3671  av_log(ic, AV_LOG_VERBOSE, "parser not found for codec "
3672  "%s, packets or times may be invalid.\n",
3674  }
3675  }
3676 
3677  if (st->codecpar->codec_id != st->internal->orig_codec_id)
3679 
3681  if (ret < 0)
3682  goto find_stream_info_err;
3683  if (st->request_probe <= 0)
3684  st->internal->avctx_inited = 1;
3685 
3686  codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3687 
3688  /* Force thread count to 1 since the H.264 decoder will not extract
3689  * SPS and PPS to extradata during multi-threaded decoding. */
3690  av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
3691 
3692  if (ic->codec_whitelist)
3693  av_dict_set(options ? &options[i] : &thread_opt, "codec_whitelist", ic->codec_whitelist, 0);
3694 
3695  /* Ensure that subtitle_header is properly set. */
3697  && codec && !avctx->codec) {
3698  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3699  av_log(ic, AV_LOG_WARNING,
3700  "Failed to open codec in %s\n",__FUNCTION__);
3701  }
3702 
3703  // Try to just open decoders, in case this is enough to get parameters.
3704  if (!has_codec_parameters(st, NULL) && st->request_probe <= 0) {
3705  if (codec && !avctx->codec)
3706  if (avcodec_open2(avctx, codec, options ? &options[i] : &thread_opt) < 0)
3707  av_log(ic, AV_LOG_WARNING,
3708  "Failed to open codec in %s\n",__FUNCTION__);
3709  }
3710  if (!options)
3711  av_dict_free(&thread_opt);
3712  }
3713 
3714  for (i = 0; i < ic->nb_streams; i++) {
3715 #if FF_API_R_FRAME_RATE
3717 #endif
3720  }
3721 
3722  read_size = 0;
3723  for (;;) {
3724  const AVPacket *pkt;
3725  int analyzed_all_streams;
3727  ret = AVERROR_EXIT;
3728  av_log(ic, AV_LOG_DEBUG, "interrupted\n");
3729  break;
3730  }
3731 
3732  /* check if one codec still needs to be handled */
3733  for (i = 0; i < ic->nb_streams; i++) {
3734  int fps_analyze_framecount = 20;
3735  int count;
3736 
3737  st = ic->streams[i];
3738  if (!has_codec_parameters(st, NULL))
3739  break;
3740  /* If the timebase is coarse (like the usual millisecond precision
3741  * of mkv), we need to analyze more frames to reliably arrive at
3742  * the correct fps. */
3743  if (av_q2d(st->time_base) > 0.0005)
3744  fps_analyze_framecount *= 2;
3745  if (!tb_unreliable(st->internal->avctx))
3746  fps_analyze_framecount = 0;
3747  if (ic->fps_probe_size >= 0)
3748  fps_analyze_framecount = ic->fps_probe_size;
3750  fps_analyze_framecount = 0;
3751  /* variable fps and no guess at the real fps */
3752  count = (ic->iformat->flags & AVFMT_NOTIMESTAMPS) ?
3754  st->info->duration_count;
3755  if (!(st->r_frame_rate.num && st->avg_frame_rate.num) &&
3757  if (count < fps_analyze_framecount)
3758  break;
3759  }
3760  // Look at the first 3 frames if there is evidence of frame delay
3761  // but the decoder delay is not set.
3762  if (st->info->frame_delay_evidence && count < 2 && st->internal->avctx->has_b_frames == 0)
3763  break;
3764  if (!st->internal->avctx->extradata &&
3766  st->internal->extract_extradata.bsf) &&
3768  break;
3769  if (st->first_dts == AV_NOPTS_VALUE &&
3770  !(ic->iformat->flags & AVFMT_NOTIMESTAMPS) &&
3774  break;
3775  }
3776  analyzed_all_streams = 0;
3777  if (!missing_streams || !*missing_streams)
3778  if (i == ic->nb_streams) {
3779  analyzed_all_streams = 1;
3780  /* NOTE: If the format has no header, then we need to read some
3781  * packets to get most of the streams, so we cannot stop here. */
3782  if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
3783  /* If we found the info for all the codecs, we can stop. */
3784  ret = count;
3785  av_log(ic, AV_LOG_DEBUG, "All info found\n");
3786  flush_codecs = 0;
3787  break;
3788  }
3789  }
3790  /* We did not get all the codec info, but we read too much data. */
3791  if (read_size >= probesize) {
3792  ret = count;
3793  av_log(ic, AV_LOG_DEBUG,
3794  "Probe buffer size limit of %"PRId64" bytes reached\n", probesize);
3795  for (i = 0; i < ic->nb_streams; i++)
3796  if (!ic->streams[i]->r_frame_rate.num &&
3797  ic->streams[i]->info->duration_count <= 1 &&
3799  strcmp(ic->iformat->name, "image2"))
3800  av_log(ic, AV_LOG_WARNING,
3801  "Stream #%d: not enough frames to estimate rate; "
3802  "consider increasing probesize\n", i);
3803  break;
3804  }
3805 
3806  /* NOTE: A new stream can be added there if no header in file
3807  * (AVFMTCTX_NOHEADER). */
3808  ret = read_frame_internal(ic, &pkt1);
3809  if (ret == AVERROR(EAGAIN))
3810  continue;
3811 
3812  if (ret < 0) {
3813  /* EOF or error*/
3814  eof_reached = 1;
3815  break;
3816  }
3817 
3818  if (!(ic->flags & AVFMT_FLAG_NOBUFFER)) {
3821  &pkt1, 0);
3822  if (ret < 0)
3823  goto unref_then_goto_end;
3824 
3825  pkt = &ic->internal->packet_buffer_end->pkt;
3826  } else {
3827  pkt = &pkt1;
3828  }
3829 
3830  st = ic->streams[pkt->stream_index];
3832  read_size += pkt->size;
3833 
3834  avctx = st->internal->avctx;
3835  if (!st->internal->avctx_inited) {
3837  if (ret < 0)
3838  goto unref_then_goto_end;
3839  st->internal->avctx_inited = 1;
3840  }
3841 
3842  if (pkt->dts != AV_NOPTS_VALUE && st->codec_info_nb_frames > 1) {
3843  /* check for non-increasing dts */
3844  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3845  st->info->fps_last_dts >= pkt->dts) {
3846  av_log(ic, AV_LOG_DEBUG,
3847  "Non-increasing DTS in stream %d: packet %d with DTS "
3848  "%"PRId64", packet %d with DTS %"PRId64"\n",
3849  st->index, st->info->fps_last_dts_idx,
3851  pkt->dts);
3852  st->info->fps_first_dts =
3854  }
3855  /* Check for a discontinuity in dts. If the difference in dts
3856  * is more than 1000 times the average packet duration in the
3857  * sequence, we treat it as a discontinuity. */
3858  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3860  (pkt->dts - (uint64_t)st->info->fps_last_dts) / 1000 >
3861  (st->info->fps_last_dts - (uint64_t)st->info->fps_first_dts) /
3862  (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
3863  av_log(ic, AV_LOG_WARNING,
3864  "DTS discontinuity in stream %d: packet %d with DTS "
3865  "%"PRId64", packet %d with DTS %"PRId64"\n",
3866  st->index, st->info->fps_last_dts_idx,
3868  pkt->dts);
3869  st->info->fps_first_dts =
3871  }
3872 
3873  /* update stored dts values */
3874  if (st->info->fps_first_dts == AV_NOPTS_VALUE) {
3875  st->info->fps_first_dts = pkt->dts;
3877  }
3878  st->info->fps_last_dts = pkt->dts;
3880  }
3881  if (st->codec_info_nb_frames>1) {
3882  int64_t t = 0;
3883  int64_t limit;
3884 
3885  if (st->time_base.den > 0)
3887  if (st->avg_frame_rate.num > 0)
3889 
3890  if ( t == 0
3891  && st->codec_info_nb_frames>30
3892  && st->info->fps_first_dts != AV_NOPTS_VALUE
3893  && st->info->fps_last_dts != AV_NOPTS_VALUE)
3895 
3896  if (analyzed_all_streams) limit = max_analyze_duration;
3897  else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) limit = max_subtitle_analyze_duration;
3898  else limit = max_stream_analyze_duration;
3899 
3900  if (t >= limit) {
3901  av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds st:%d\n",
3902  limit,
3903  t, pkt->stream_index);
3904  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3905  av_packet_unref(&pkt1);
3906  break;
3907  }
3908  if (pkt->duration) {
3909  if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE && pkt->pts != AV_NOPTS_VALUE && st->start_time != AV_NOPTS_VALUE && pkt->pts >= st->start_time) {
3910  st->info->codec_info_duration = FFMIN(pkt->pts - st->start_time, st->info->codec_info_duration + pkt->duration);
3911  } else
3912  st->info->codec_info_duration += pkt->duration;
3913  st->info->codec_info_duration_fields += st->parser && st->need_parsing && avctx->ticks_per_frame ==2 ? st->parser->repeat_pict + 1 : 2;
3914  }
3915  }
3916  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
3917 #if FF_API_R_FRAME_RATE
3918  ff_rfps_add_frame(ic, st, pkt->dts);
3919 #endif
3920  if (pkt->dts != pkt->pts && pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE)
3921  st->info->frame_delay_evidence = 1;
3922  }
3923  if (!st->internal->avctx->extradata) {
3924  ret = extract_extradata(st, pkt);
3925  if (ret < 0)
3926  goto unref_then_goto_end;
3927  }
3928 
3929  /* If still no information, we try to open the codec and to
3930  * decompress the frame. We try to avoid that in most cases as
3931  * it takes longer and uses more memory. For MPEG-4, we need to
3932  * decompress for QuickTime.
3933  *
3934  * If AV_CODEC_CAP_CHANNEL_CONF is set this will force decoding of at
3935  * least one frame of codec data, this makes sure the codec initializes
3936  * the channel configuration and does not only trust the values from
3937  * the container. */
3938  try_decode_frame(ic, st, pkt,
3939  (options && i < orig_nb_streams) ? &options[i] : NULL);
3940 
3941  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3942  av_packet_unref(&pkt1);
3943 
3944  st->codec_info_nb_frames++;
3945  count++;
3946  }
3947 
3948  if (eof_reached) {
3949  int stream_index;
3950  for (stream_index = 0; stream_index < ic->nb_streams; stream_index++) {
3951  st = ic->streams[stream_index];
3952  avctx = st->internal->avctx;
3953  if (!has_codec_parameters(st, NULL)) {
3954  const AVCodec *codec = find_probe_decoder(ic, st, st->codecpar->codec_id);
3955  if (codec && !avctx->codec) {
3956  AVDictionary *opts = NULL;
3957  if (ic->codec_whitelist)
3958  av_dict_set(&opts, "codec_whitelist", ic->codec_whitelist, 0);
3959  if (avcodec_open2(avctx, codec, (options && stream_index < orig_nb_streams) ? &options[stream_index] : &opts) < 0)
3960  av_log(ic, AV_LOG_WARNING,
3961  "Failed to open codec in %s\n",__FUNCTION__);
3962  av_dict_free(&opts);
3963  }
3964  }
3965 
3966  // EOF already reached while reading the stream above.
3967  // So continue with reoordering DTS with whatever delay we have.
3969  update_dts_from_pts(ic, stream_index, ic->internal->packet_buffer);
3970  }
3971  }
3972  }
3973 
3974  if (flush_codecs) {
3975  AVPacket empty_pkt = { 0 };
3976  int err = 0;
3977  av_init_packet(&empty_pkt);
3978 
3979  for (i = 0; i < ic->nb_streams; i++) {
3980 
3981  st = ic->streams[i];
3982 
3983  /* flush the decoders */
3984  if (st->info->found_decoder == 1) {
3985  do {
3986  err = try_decode_frame(ic, st, &empty_pkt,
3987  (options && i < orig_nb_streams)
3988  ? &options[i] : NULL);
3989  } while (err > 0 && !has_codec_parameters(st, NULL));
3990 
3991  if (err < 0) {
3992  av_log(ic, AV_LOG_INFO,
3993  "decoding for stream %d failed\n", st->index);
3994  }
3995  }
3996  }
3997  }
3998 
3999  ff_rfps_calculate(ic);
4000 
4001  for (i = 0; i < ic->nb_streams; i++) {
4002  st = ic->streams[i];
4003  avctx = st->internal->avctx;
4004  if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
4005  if (avctx->codec_id == AV_CODEC_ID_RAWVIDEO && !avctx->codec_tag && !avctx->bits_per_coded_sample) {
4006  uint32_t tag= avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
4008  avctx->codec_tag= tag;
4009  }
4010 
4011  /* estimate average framerate if not set by demuxer */
4012  if (st->info->codec_info_duration_fields &&
4013  !st->avg_frame_rate.num &&
4014  st->info->codec_info_duration) {
4015  int best_fps = 0;
4016  double best_error = 0.01;
4017  AVRational codec_frame_rate = avctx->framerate;
4018 
4019  if (st->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
4020  st->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
4021  st->info->codec_info_duration < 0)
4022  continue;
4024  st->info->codec_info_duration_fields * (int64_t) st->time_base.den,
4025  st->info->codec_info_duration * 2 * (int64_t) st->time_base.num, 60000);
4026 
4027  /* Round guessed framerate to a "standard" framerate if it's
4028  * within 1% of the original estimate. */
4029  for (j = 0; j < MAX_STD_TIMEBASES; j++) {
4030  AVRational std_fps = { get_std_framerate(j), 12 * 1001 };
4031  double error = fabs(av_q2d(st->avg_frame_rate) /
4032  av_q2d(std_fps) - 1);
4033 
4034  if (error < best_error) {
4035  best_error = error;
4036  best_fps = std_fps.num;
4037  }
4038 
4039  if (ic->internal->prefer_codec_framerate && codec_frame_rate.num > 0 && codec_frame_rate.den > 0) {
4040  error = fabs(av_q2d(codec_frame_rate) /
4041  av_q2d(std_fps) - 1);
4042  if (error < best_error) {
4043  best_error = error;
4044  best_fps = std_fps.num;
4045  }
4046  }
4047  }
4048  if (best_fps)
4050  best_fps, 12 * 1001, INT_MAX);
4051  }
4052 
4053  if (!st->r_frame_rate.num) {
4054  if ( avctx->time_base.den * (int64_t) st->time_base.num
4055  <= avctx->time_base.num * avctx->ticks_per_frame * (int64_t) st->time_base.den) {
4057  avctx->time_base.den, (int64_t)avctx->time_base.num * avctx->ticks_per_frame, INT_MAX);
4058  } else {
4059  st->r_frame_rate.num = st->time_base.den;
4060  st->r_frame_rate.den = st->time_base.num;
4061  }
4062  }
4064  AVRational hw_ratio = { avctx->height, avctx->width };
4066  hw_ratio);
4067  }
4068  } else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
4069  if (!avctx->bits_per_coded_sample)
4070  avctx->bits_per_coded_sample =
4072  // set stream disposition based on audio service type
4073  switch (avctx->audio_service_type) {
4076  break;
4079  break;
4082  break;
4085  break;
4088  break;
4089  }
4090  }
4091  }
4092 
4093  if (probesize)
4094  estimate_timings(ic, old_offset);
4095 
4096  av_opt_set(ic, "skip_clear", "0", AV_OPT_SEARCH_CHILDREN);
4097 
4098  if (ret >= 0 && ic->nb_streams)
4099  /* We could not have all the codec parameters before EOF. */
4100  ret = -1;
4101  for (i = 0; i < ic->nb_streams; i++) {
4102  const char *errmsg;
4103  st = ic->streams[i];
4104 
4105  /* if no packet was ever seen, update context now for has_codec_parameters */
4106  if (!st->internal->avctx_inited) {
4107  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
4109  st->codecpar->format = st->internal->avctx->sample_fmt;
4111  if (ret < 0)
4112  goto find_stream_info_err;
4113  }
4114  if (!has_codec_parameters(st, &errmsg)) {
4115  char buf[256];
4116  avcodec_string(buf, sizeof(buf), st->internal->avctx, 0);
4117  av_log(ic, AV_LOG_WARNING,
4118  "Could not find codec parameters for stream %d (%s): %s\n"
4119  "Consider increasing the value for the 'analyzeduration' and 'probesize' options\n",
4120  i, buf, errmsg);
4121  } else {
4122  ret = 0;
4123  }
4124  }
4125 
4127 
4128  /* update the stream parameters from the internal codec contexts */
4129  for (i = 0; i < ic->nb_streams; i++) {
4130  st = ic->streams[i];
4131 
4132  if (st->internal->avctx_inited) {
4133  int orig_w = st->codecpar->width;
4134  int orig_h = st->codecpar->height;
4136  if (ret < 0)
4137  goto find_stream_info_err;
4138 #if FF_API_LOWRES
4139  // The decoder might reduce the video size by the lowres factor.
4140  if (st->internal->avctx->lowres && orig_w) {
4141  st->codecpar->width = orig_w;
4142  st->codecpar->height = orig_h;
4143  }
4144 #endif
4145  }
4146 
4147 #if FF_API_LAVF_AVCTX
4149  ret = avcodec_parameters_to_context(st->codec, st->codecpar);
4150  if (ret < 0)
4151  goto find_stream_info_err;
4152 
4153 #if FF_API_LOWRES
4154  // The old API (AVStream.codec) "requires" the resolution to be adjusted
4155  // by the lowres factor.
4156  if (st->internal->avctx->lowres && st->internal->avctx->width) {
4157  st->codec->lowres = st->internal->avctx->lowres;
4158  st->codec->width = st->internal->avctx->width;
4159  st->codec->height = st->internal->avctx->height;
4160  }
4161 #endif
4162 
4163  if (st->codec->codec_tag != MKTAG('t','m','c','d')) {
4164  st->codec->time_base = st->internal->avctx->time_base;
4165  st->codec->ticks_per_frame = st->internal->avctx->ticks_per_frame;
4166  }
4167  st->codec->framerate = st->avg_frame_rate;
4168 
4169  if (st->internal->avctx->subtitle_header) {
4170  st->codec->subtitle_header = av_malloc(st->internal->avctx->subtitle_header_size);
4171  if (!st->codec->subtitle_header)
4172  goto find_stream_info_err;
4173  st->codec->subtitle_header_size = st->internal->avctx->subtitle_header_size;
4174  memcpy(st->codec->subtitle_header, st->internal->avctx->subtitle_header,
4175  st->codec->subtitle_header_size);
4176  }
4177 
4178  // Fields unavailable in AVCodecParameters
4179  st->codec->coded_width = st->internal->avctx->coded_width;
4180  st->codec->coded_height = st->internal->avctx->coded_height;
4181  st->codec->properties = st->internal->avctx->properties;
4183 #endif
4184 
4185  st->internal->avctx_inited = 0;
4186  }
4187 
4188 find_stream_info_err:
4189  for (i = 0; i < ic->nb_streams; i++) {
4190  st = ic->streams[i];
4191  if (st->info)
4192  av_freep(&st->info->duration_error);
4193  avcodec_close(ic->streams[i]->internal->avctx);
4194  av_freep(&ic->streams[i]->info);
4197  }
4198  if (ic->pb)
4199  av_log(ic, AV_LOG_DEBUG, "After avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d frames:%d\n",
4200  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, count);
4201  return ret;
4202 
4203 unref_then_goto_end:
4204  av_packet_unref(&pkt1);
4205  goto find_stream_info_err;
4206 }
4207 
4209 {
4210  int i, j;
4211 
4212  for (i = 0; i < ic->nb_programs; i++) {
4213  if (ic->programs[i] == last) {
4214  last = NULL;
4215  } else {
4216  if (!last)
4217  for (j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
4218  if (ic->programs[i]->stream_index[j] == s)
4219  return ic->programs[i];
4220  }
4221  }
4222  return NULL;
4223 }
4224 
4226  int wanted_stream_nb, int related_stream,
4227  AVCodec **decoder_ret, int flags)
4228 {
4229  int i, nb_streams = ic->nb_streams;
4231  int best_count = -1, best_multiframe = -1, best_disposition = -1;
4232  int count, multiframe, disposition;
4233  int64_t best_bitrate = -1;
4234  int64_t bitrate;
4235  unsigned *program = NULL;
4236  const AVCodec *decoder = NULL, *best_decoder = NULL;
4237 
4238  if (related_stream >= 0 && wanted_stream_nb < 0) {
4239  AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
4240  if (p) {
4241  program = p->stream_index;
4242  nb_streams = p->nb_stream_indexes;
4243  }
4244  }
4245  for (i = 0; i < nb_streams; i++) {
4246  int real_stream_index = program ? program[i] : i;
4247  AVStream *st = ic->streams[real_stream_index];
4248  AVCodecParameters *par = st->codecpar;
4249  if (par->codec_type != type)
4250  continue;
4251  if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
4252  continue;
4253  if (type == AVMEDIA_TYPE_AUDIO && !(par->channels && par->sample_rate))
4254  continue;
4255  if (decoder_ret) {
4256  decoder = find_decoder(ic, st, par->codec_id);
4257  if (!decoder) {
4258  if (ret < 0)
4260  continue;
4261  }
4262  }
4264  + !! (st->disposition & AV_DISPOSITION_DEFAULT);
4265  count = st->codec_info_nb_frames;
4266  bitrate = par->bit_rate;
4267  multiframe = FFMIN(5, count);
4268  if ((best_disposition > disposition) ||
4269  (best_disposition == disposition && best_multiframe > multiframe) ||
4270  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate > bitrate) ||
4271  (best_disposition == disposition && best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
4272  continue;
4273  best_disposition = disposition;
4274  best_count = count;
4275  best_bitrate = bitrate;
4276  best_multiframe = multiframe;
4277  ret = real_stream_index;
4278  best_decoder = decoder;
4279  if (program && i == nb_streams - 1 && ret < 0) {
4280  program = NULL;
4281  nb_streams = ic->nb_streams;
4282  /* no related stream found, try again with everything */
4283  i = 0;
4284  }
4285  }
4286  if (decoder_ret)
4287  *decoder_ret = (AVCodec*)best_decoder;
4288  return ret;
4289 }
4290 
4291 /*******************************************************/
4292 
4294 {
4295  if (s->iformat->read_play)
4296  return s->iformat->read_play(s);
4297  if (s->pb)
4298  return avio_pause(s->pb, 0);
4299  return AVERROR(ENOSYS);
4300 }
4301 
4303 {
4304  if (s->iformat->read_pause)
4305  return s->iformat->read_pause(s);
4306  if (s->pb)
4307  return avio_pause(s->pb, 1);
4308  return AVERROR(ENOSYS);
4309 }
4310 
4312 {
4313  int ret, i;
4314 
4315  dst->id = src->id;
4316  dst->time_base = src->time_base;
4317  dst->nb_frames = src->nb_frames;
4318  dst->disposition = src->disposition;
4320  dst->avg_frame_rate = src->avg_frame_rate;
4321  dst->r_frame_rate = src->r_frame_rate;
4322 
4323  av_dict_free(&dst->metadata);
4324  ret = av_dict_copy(&dst->metadata, src->metadata, 0);
4325  if (ret < 0)
4326  return ret;
4327 
4328  ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
4329  if (ret < 0)
4330  return ret;
4331 
4332  /* Free existing side data*/
4333  for (i = 0; i < dst->nb_side_data; i++)
4334  av_free(dst->side_data[i].data);
4335  av_freep(&dst->side_data);
4336  dst->nb_side_data = 0;
4337 
4338  /* Copy side data if present */
4339  if (src->nb_side_data) {
4341  sizeof(AVPacketSideData));
4342  if (!dst->side_data)
4343  return AVERROR(ENOMEM);
4344  dst->nb_side_data = src->nb_side_data;
4345 
4346  for (i = 0; i < src->nb_side_data; i++) {
4347  uint8_t *data = av_memdup(src->side_data[i].data,
4348  src->side_data[i].size);
4349  if (!data)
4350  return AVERROR(ENOMEM);
4351  dst->side_data[i].type = src->side_data[i].type;
4352  dst->side_data[i].size = src->side_data[i].size;
4353  dst->side_data[i].data = data;
4354  }
4355  }
4356 
4357 #if FF_API_LAVF_FFSERVER
4359  av_freep(&dst->recommended_encoder_configuration);
4360  if (src->recommended_encoder_configuration) {
4361  const char *conf_str = src->recommended_encoder_configuration;
4362  dst->recommended_encoder_configuration = av_strdup(conf_str);
4363  if (!dst->recommended_encoder_configuration)
4364  return AVERROR(ENOMEM);
4365  }
4367 #endif
4368 
4369  return 0;
4370 }
4371 
4372 static void free_stream(AVStream **pst)
4373 {
4374  AVStream *st = *pst;
4375  int i;
4376 
4377  if (!st)
4378  return;
4379 
4380  for (i = 0; i < st->nb_side_data; i++)
4381  av_freep(&st->side_data[i].data);
4382  av_freep(&st->side_data);
4383 
4384  if (st->parser)
4385  av_parser_close(st->parser);
4386 
4387  if (st->attached_pic.data)
4389 
4390  if (st->internal) {
4392  for (i = 0; i < st->internal->nb_bsfcs; i++) {
4393  av_bsf_free(&st->internal->bsfcs[i]);
4394  av_freep(&st->internal->bsfcs);
4395  }
4396  av_freep(&st->internal->priv_pts);
4399  }
4400  av_freep(&st->internal);
4401 
4402  av_dict_free(&st->metadata);
4404  av_freep(&st->probe_data.buf);
4405  av_freep(&st->index_entries);
4406 #if FF_API_LAVF_AVCTX
4408  avcodec_free_context(&st->codec);
4410 #endif
4411  av_freep(&st->priv_data);
4412  if (st->info)
4413  av_freep(&st->info->duration_error);
4414  av_freep(&st->info);
4415 #if FF_API_LAVF_FFSERVER
4417  av_freep(&st->recommended_encoder_configuration);
4419 #endif
4420 
4421  av_freep(pst);
4422 }
4423 
4425 {
4426  av_assert0(s->nb_streams>0);
4427  av_assert0(s->streams[ s->nb_streams - 1 ] == st);
4428 
4429  free_stream(&s->streams[ --s->nb_streams ]);
4430 }
4431 
4433 {
4434  int i;
4435 
4436  if (!s)
4437  return;
4438 
4439  if (s->oformat && s->oformat->deinit && s->internal->initialized)
4440  s->oformat->deinit(s);
4441 
4442  av_opt_free(s);
4443  if (s->iformat && s->iformat->priv_class && s->priv_data)
4444  av_opt_free(s->priv_data);
4445  if (s->oformat && s->oformat->priv_class && s->priv_data)
4446  av_opt_free(s->priv_data);
4447 
4448  for (i = s->nb_streams - 1; i >= 0; i--)
4449  ff_free_stream(s, s->streams[i]);
4450 
4451 
4452  for (i = s->nb_programs - 1; i >= 0; i--) {
4453  av_dict_free(&s->programs[i]->metadata);
4454  av_freep(&s->programs[i]->stream_index);
4455  av_freep(&s->programs[i]);
4456  }
4457  av_freep(&s->programs);
4458  av_freep(&s->priv_data);
4459  while (s->nb_chapters--) {
4461  av_freep(&s->chapters[s->nb_chapters]);
4462  }
4463  av_freep(&s->chapters);
4464  av_dict_free(&s->metadata);
4466  av_freep(&s->streams);
4467  flush_packet_queue(s);
4468  av_freep(&s->internal);
4469  av_freep(&s->url);
4470  av_free(s);
4471 }
4472 
4474 {
4475  AVFormatContext *s;
4476  AVIOContext *pb;
4477 
4478  if (!ps || !*ps)
4479  return;
4480 
4481  s = *ps;
4482  pb = s->pb;
4483 
4484  if ((s->iformat && strcmp(s->iformat->name, "image2") && s->iformat->flags & AVFMT_NOFILE) ||
4485  (s->flags & AVFMT_FLAG_CUSTOM_IO))
4486  pb = NULL;
4487 
4488  flush_packet_queue(s);
4489 
4490  if (s->iformat)
4491  if (s->iformat->read_close)
4492  s->iformat->read_close(s);
4493 
4495 
4496  *ps = NULL;
4497 
4498  avio_close(pb);
4499 }
4500 
4502 {
4503  AVStream *st;
4504  int i;
4505  AVStream **streams;
4506 
4507  if (s->nb_streams >= FFMIN(s->max_streams, INT_MAX/sizeof(*streams))) {
4508  if (s->max_streams < INT_MAX/sizeof(*streams))
4509  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);
4510  return NULL;
4511  }
4512  streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
4513  if (!streams)
4514  return NULL;
4515  s->streams = streams;
4516 
4517  st = av_mallocz(sizeof(AVStream));
4518  if (!st)
4519  return NULL;
4520  if (!(st->info = av_mallocz(sizeof(*st->info)))) {
4521  av_free(st);
4522  return NULL;
4523  }
4524  st->info->last_dts = AV_NOPTS_VALUE;
4525 
4526 #if FF_API_LAVF_AVCTX
4528  st->codec = avcodec_alloc_context3(c);
4529  if (!st->codec) {
4530  av_free(st->info);
4531  av_free(st);
4532  return NULL;
4533  }
4535 #endif
4536 
4537  st->internal = av_mallocz(sizeof(*st->internal));
4538  if (!st->internal)
4539  goto fail;
4540 
4542  if (!st->codecpar)
4543  goto fail;
4544 
4546  if (!st->internal->avctx)
4547  goto fail;
4548 
4549  if (s->iformat) {
4550 #if FF_API_LAVF_AVCTX
4552  /* no default bitrate if decoding */
4553  st->codec->bit_rate = 0;
4555 #endif
4556 
4557  /* default pts setting is MPEG-like */
4558  avpriv_set_pts_info(st, 33, 1, 90000);
4559  /* we set the current DTS to 0 so that formats without any timestamps
4560  * but durations get some timestamps, formats with some unknown
4561  * timestamps have their first few packets buffered and the
4562  * timestamps corrected before they are returned to the user */
4563  st->cur_dts = RELATIVE_TS_BASE;
4564  } else {
4565  st->cur_dts = AV_NOPTS_VALUE;
4566  }
4567 
4568  st->index = s->nb_streams;
4569  st->start_time = AV_NOPTS_VALUE;
4570  st->duration = AV_NOPTS_VALUE;
4571  st->first_dts = AV_NOPTS_VALUE;
4575 
4578  for (i = 0; i < MAX_REORDER_DELAY + 1; i++)
4579  st->pts_buffer[i] = AV_NOPTS_VALUE;
4580 
4581  st->sample_aspect_ratio = (AVRational) { 0, 1 };
4582 
4583