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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 #undef NDEBUG
23 #include <assert.h>
24 #include <stdarg.h>
25 #include <stdint.h>
26 
27 #include "config.h"
28 
29 #include "libavutil/avassert.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/dict.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/mathematics.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/parseutils.h"
36 #include "libavutil/pixdesc.h"
37 #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 /**
57  * @file
58  * various utility functions for use within FFmpeg
59  */
60 
61 unsigned avformat_version(void)
62 {
65 }
66 
67 const char *avformat_configuration(void)
68 {
69  return FFMPEG_CONFIGURATION;
70 }
71 
72 const char *avformat_license(void)
73 {
74 #define LICENSE_PREFIX "libavformat license: "
75  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
76 }
77 
78 #define RELATIVE_TS_BASE (INT64_MAX - (1LL<<48))
79 
80 static int is_relative(int64_t ts) {
81  return ts > (RELATIVE_TS_BASE - (1LL<<48));
82 }
83 
84 /**
85  * Wrap a given time stamp, if there is an indication for an overflow
86  *
87  * @param st stream
88  * @param timestamp the time stamp to wrap
89  * @return resulting time stamp
90  */
91 static int64_t wrap_timestamp(AVStream *st, int64_t timestamp)
92 {
94  st->pts_wrap_reference != AV_NOPTS_VALUE && timestamp != AV_NOPTS_VALUE) {
96  timestamp < st->pts_wrap_reference)
97  return timestamp + (1ULL << st->pts_wrap_bits);
98  else if (st->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET &&
99  timestamp >= st->pts_wrap_reference)
100  return timestamp - (1ULL << st->pts_wrap_bits);
101  }
102  return timestamp;
103 }
104 
105 MAKE_ACCESSORS(AVStream, stream, AVRational, r_frame_rate)
106 MAKE_ACCESSORS(AVStream, stream, char *, recommended_encoder_configuration)
107 MAKE_ACCESSORS(AVFormatContext, format, AVCodec *, video_codec)
108 MAKE_ACCESSORS(AVFormatContext, format, AVCodec *, audio_codec)
109 MAKE_ACCESSORS(AVFormatContext, format, AVCodec *, subtitle_codec)
110 MAKE_ACCESSORS(AVFormatContext, format, int, metadata_header_padding)
111 MAKE_ACCESSORS(AVFormatContext, format, void *, opaque)
112 MAKE_ACCESSORS(AVFormatContext, format, av_format_control_message, control_message_cb)
113 
114 int64_t av_stream_get_end_pts(const AVStream *st)
115 {
116  return st->pts.val;
117 }
118 
120 {
121  return st->parser;
122 }
123 
125 {
126  int i;
128  for (i = 0; i < s->nb_streams; i++) {
129  AVStream *st = s->streams[i];
130  st->inject_global_side_data = 1;
131  }
132 }
133 
135 {
137  dst-> codec_whitelist = av_strdup(src->codec_whitelist);
139  if ( (src-> codec_whitelist && !dst-> codec_whitelist)
140  || (src->format_whitelist && !dst->format_whitelist)) {
141  av_log(dst, AV_LOG_ERROR, "Failed to duplicate whitelist\n");
142  return AVERROR(ENOMEM);
143  }
144  return 0;
145 }
146 
148 {
149  if (st->codec->codec)
150  return st->codec->codec;
151 
152  switch (st->codec->codec_type) {
153  case AVMEDIA_TYPE_VIDEO:
154  if (s->video_codec) return s->video_codec;
155  break;
156  case AVMEDIA_TYPE_AUDIO:
157  if (s->audio_codec) return s->audio_codec;
158  break;
160  if (s->subtitle_codec) return s->subtitle_codec;
161  break;
162  }
163 
164  return avcodec_find_decoder(codec_id);
165 }
166 
168 {
169  return s->probe_score;
170 }
171 
172 /* an arbitrarily chosen "sane" max packet size -- 50M */
173 #define SANE_CHUNK_SIZE (50000000)
174 
176 {
177  if (s->maxsize>= 0) {
178  int64_t remaining= s->maxsize - avio_tell(s);
179  if (remaining < size) {
180  int64_t newsize = avio_size(s);
181  if (!s->maxsize || s->maxsize<newsize)
182  s->maxsize = newsize - !newsize;
183  remaining= s->maxsize - avio_tell(s);
184  remaining= FFMAX(remaining, 0);
185  }
186 
187  if (s->maxsize>= 0 && remaining+1 < size) {
188  av_log(NULL, remaining ? AV_LOG_ERROR : AV_LOG_DEBUG, "Truncating packet of size %d to %"PRId64"\n", size, remaining+1);
189  size = remaining+1;
190  }
191  }
192  return size;
193 }
194 
195 /* Read the data in sane-sized chunks and append to pkt.
196  * Return the number of bytes read or an error. */
198 {
199  int64_t orig_pos = pkt->pos; // av_grow_packet might reset pos
200  int orig_size = pkt->size;
201  int ret;
202 
203  do {
204  int prev_size = pkt->size;
205  int read_size;
206 
207  /* When the caller requests a lot of data, limit it to the amount
208  * left in file or SANE_CHUNK_SIZE when it is not known. */
209  read_size = size;
210  if (read_size > SANE_CHUNK_SIZE/10) {
211  read_size = ffio_limit(s, read_size);
212  // If filesize/maxsize is unknown, limit to SANE_CHUNK_SIZE
213  if (s->maxsize < 0)
214  read_size = FFMIN(read_size, SANE_CHUNK_SIZE);
215  }
216 
217  ret = av_grow_packet(pkt, read_size);
218  if (ret < 0)
219  break;
220 
221  ret = avio_read(s, pkt->data + prev_size, read_size);
222  if (ret != read_size) {
223  av_shrink_packet(pkt, prev_size + FFMAX(ret, 0));
224  break;
225  }
226 
227  size -= read_size;
228  } while (size > 0);
229  if (size > 0)
230  pkt->flags |= AV_PKT_FLAG_CORRUPT;
231 
232  pkt->pos = orig_pos;
233  if (!pkt->size)
234  av_free_packet(pkt);
235  return pkt->size > orig_size ? pkt->size - orig_size : ret;
236 }
237 
239 {
240  av_init_packet(pkt);
241  pkt->data = NULL;
242  pkt->size = 0;
243  pkt->pos = avio_tell(s);
244 
245  return append_packet_chunked(s, pkt, size);
246 }
247 
249 {
250  if (!pkt->size)
251  return av_get_packet(s, pkt, size);
252  return append_packet_chunked(s, pkt, size);
253 }
254 
255 int av_filename_number_test(const char *filename)
256 {
257  char buf[1024];
258  return filename &&
259  (av_get_frame_filename(buf, sizeof(buf), filename, 1) >= 0);
260 }
261 
263  AVProbeData *pd)
264 {
265  static const struct {
266  const char *name;
267  enum AVCodecID id;
268  enum AVMediaType type;
269  } fmt_id_type[] = {
279  { "mpegvideo", AV_CODEC_ID_MPEG2VIDEO, AVMEDIA_TYPE_VIDEO },
280  { 0 }
281  };
282  int score;
283  AVInputFormat *fmt = av_probe_input_format3(pd, 1, &score);
284 
285  if (fmt && st->request_probe <= score) {
286  int i;
287  av_log(s, AV_LOG_DEBUG,
288  "Probe with size=%d, packets=%d detected %s with score=%d\n",
290  fmt->name, score);
291  for (i = 0; fmt_id_type[i].name; i++) {
292  if (!strcmp(fmt->name, fmt_id_type[i].name)) {
293  st->codec->codec_id = fmt_id_type[i].id;
294  st->codec->codec_type = fmt_id_type[i].type;
295  return score;
296  }
297  }
298  }
299  return 0;
300 }
301 
302 /************************************************************/
303 /* input media file */
304 
306  int err;
307 
308  if (ic->format_whitelist && av_match_list(ic->iformat->name, ic->format_whitelist, ',') <= 0) {
309  av_log(ic, AV_LOG_ERROR, "Format not on whitelist\n");
310  return AVERROR(EINVAL);
311  }
312 
313  if (ic->iformat->read_header) {
314  err = ic->iformat->read_header(ic);
315  if (err < 0)
316  return err;
317  }
318 
319  if (ic->pb && !ic->data_offset)
320  ic->data_offset = avio_tell(ic->pb);
321 
322  return 0;
323 }
324 
325 /* Open input file and probe the format if necessary. */
326 static int init_input(AVFormatContext *s, const char *filename,
328 {
329  int ret;
330  AVProbeData pd = { filename, NULL, 0 };
331  int score = AVPROBE_SCORE_RETRY;
332 
333  if (s->pb) {
335  if (!s->iformat)
336  return av_probe_input_buffer2(s->pb, &s->iformat, filename,
337  s, 0, s->format_probesize);
338  else if (s->iformat->flags & AVFMT_NOFILE)
339  av_log(s, AV_LOG_WARNING, "Custom AVIOContext makes no sense and "
340  "will be ignored with AVFMT_NOFILE format.\n");
341  return 0;
342  }
343 
344  if ((s->iformat && s->iformat->flags & AVFMT_NOFILE) ||
345  (!s->iformat && (s->iformat = av_probe_input_format2(&pd, 0, &score))))
346  return score;
347 
348  if ((ret = avio_open2(&s->pb, filename, AVIO_FLAG_READ | s->avio_flags,
349  &s->interrupt_callback, options)) < 0)
350  return ret;
351  if (s->iformat)
352  return 0;
353  return av_probe_input_buffer2(s->pb, &s->iformat, filename,
354  s, 0, s->format_probesize);
355 }
356 
357 static AVPacket *add_to_pktbuf(AVPacketList **packet_buffer, AVPacket *pkt,
358  AVPacketList **plast_pktl)
359 {
360  AVPacketList *pktl = av_mallocz(sizeof(AVPacketList));
361  if (!pktl)
362  return NULL;
363 
364  if (*packet_buffer)
365  (*plast_pktl)->next = pktl;
366  else
367  *packet_buffer = pktl;
368 
369  /* Add the packet in the buffered packet list. */
370  *plast_pktl = pktl;
371  pktl->pkt = *pkt;
372  return &pktl->pkt;
373 }
374 
376 {
377  int i;
378  for (i = 0; i < s->nb_streams; i++)
380  s->streams[i]->discard < AVDISCARD_ALL) {
382  if (copy.size <= 0) {
384  "Attached picture on stream %d has invalid size, "
385  "ignoring\n", i);
386  continue;
387  }
388  copy.buf = av_buffer_ref(copy.buf);
389  if (!copy.buf)
390  return AVERROR(ENOMEM);
391 
392  add_to_pktbuf(&s->raw_packet_buffer, &copy,
394  }
395  return 0;
396 }
397 
398 int avformat_open_input(AVFormatContext **ps, const char *filename,
400 {
401  AVFormatContext *s = *ps;
402  int ret = 0;
403  AVDictionary *tmp = NULL;
404  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
405 
406  if (!s && !(s = avformat_alloc_context()))
407  return AVERROR(ENOMEM);
408  if (!s->av_class) {
409  av_log(NULL, AV_LOG_ERROR, "Input context has not been properly allocated by avformat_alloc_context() and is not NULL either\n");
410  return AVERROR(EINVAL);
411  }
412  if (fmt)
413  s->iformat = fmt;
414 
415  if (options)
416  av_dict_copy(&tmp, *options, 0);
417 
418  if ((ret = av_opt_set_dict(s, &tmp)) < 0)
419  goto fail;
420 
421  if ((ret = init_input(s, filename, &tmp)) < 0)
422  goto fail;
423  s->probe_score = ret;
424 
425  if (s->format_whitelist && av_match_list(s->iformat->name, s->format_whitelist, ',') <= 0) {
426  av_log(s, AV_LOG_ERROR, "Format not on whitelist\n");
427  ret = AVERROR(EINVAL);
428  goto fail;
429  }
430 
432 
433  /* Check filename in case an image number is expected. */
434  if (s->iformat->flags & AVFMT_NEEDNUMBER) {
435  if (!av_filename_number_test(filename)) {
436  ret = AVERROR(EINVAL);
437  goto fail;
438  }
439  }
440 
442  av_strlcpy(s->filename, filename ? filename : "", sizeof(s->filename));
443 
444  /* Allocate private data. */
445  if (s->iformat->priv_data_size > 0) {
446  if (!(s->priv_data = av_mallocz(s->iformat->priv_data_size))) {
447  ret = AVERROR(ENOMEM);
448  goto fail;
449  }
450  if (s->iformat->priv_class) {
451  *(const AVClass **) s->priv_data = s->iformat->priv_class;
453  if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
454  goto fail;
455  }
456  }
457 
458  /* e.g. AVFMT_NOFILE formats will not have a AVIOContext */
459  if (s->pb)
460  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
461 
462  if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->iformat->read_header)
463  if ((ret = s->iformat->read_header(s)) < 0)
464  goto fail;
465 
466  if (id3v2_extra_meta) {
467  if (!strcmp(s->iformat->name, "mp3") || !strcmp(s->iformat->name, "aac") ||
468  !strcmp(s->iformat->name, "tta")) {
469  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0)
470  goto fail;
471  } else
472  av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
473  }
474  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
475 
476  if ((ret = avformat_queue_attached_pictures(s)) < 0)
477  goto fail;
478 
479  if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->pb && !s->data_offset)
480  s->data_offset = avio_tell(s->pb);
481 
483 
484  if (options) {
485  av_dict_free(options);
486  *options = tmp;
487  }
488  *ps = s;
489  return 0;
490 
491 fail:
492  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
493  av_dict_free(&tmp);
494  if (s->pb && !(s->flags & AVFMT_FLAG_CUSTOM_IO))
495  avio_close(s->pb);
497  *ps = NULL;
498  return ret;
499 }
500 
501 /*******************************************************/
502 
504 {
505  switch (st->codec->codec_type) {
506  case AVMEDIA_TYPE_VIDEO:
507  if (s->video_codec_id)
508  st->codec->codec_id = s->video_codec_id;
509  break;
510  case AVMEDIA_TYPE_AUDIO:
511  if (s->audio_codec_id)
512  st->codec->codec_id = s->audio_codec_id;
513  break;
515  if (s->subtitle_codec_id)
516  st->codec->codec_id = s->subtitle_codec_id;
517  break;
518  }
519 }
520 
522 {
523  if (st->request_probe>0) {
524  AVProbeData *pd = &st->probe_data;
525  int end;
526  av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
527  --st->probe_packets;
528 
529  if (pkt) {
530  uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
531  if (!new_buf) {
533  "Failed to reallocate probe buffer for stream %d\n",
534  st->index);
535  goto no_packet;
536  }
537  pd->buf = new_buf;
538  memcpy(pd->buf + pd->buf_size, pkt->data, pkt->size);
539  pd->buf_size += pkt->size;
540  memset(pd->buf + pd->buf_size, 0, AVPROBE_PADDING_SIZE);
541  } else {
542 no_packet:
543  st->probe_packets = 0;
544  if (!pd->buf_size) {
546  "nothing to probe for stream %d\n", st->index);
547  }
548  }
549 
551  || st->probe_packets<= 0;
552 
553  if (end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)) {
554  int score = set_codec_from_probe_data(s, st, pd);
556  || end) {
557  pd->buf_size = 0;
558  av_freep(&pd->buf);
559  st->request_probe = -1;
560  if (st->codec->codec_id != AV_CODEC_ID_NONE) {
561  av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
562  } else
563  av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
564  }
565  force_codec_ids(s, st);
566  }
567  }
568  return 0;
569 }
570 
571 static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
572 {
573  int64_t ref = pkt->dts;
574  int i, pts_wrap_behavior;
575  int64_t pts_wrap_reference;
576  AVProgram *first_program;
577 
578  if (ref == AV_NOPTS_VALUE)
579  ref = pkt->pts;
580  if (st->pts_wrap_reference != AV_NOPTS_VALUE || st->pts_wrap_bits >= 63 || ref == AV_NOPTS_VALUE || !s->correct_ts_overflow)
581  return 0;
582  ref &= (1LL << st->pts_wrap_bits)-1;
583 
584  // reference time stamp should be 60 s before first time stamp
585  pts_wrap_reference = ref - av_rescale(60, st->time_base.den, st->time_base.num);
586  // if first time stamp is not more than 1/8 and 60s before the wrap point, subtract rather than add wrap offset
587  pts_wrap_behavior = (ref < (1LL << st->pts_wrap_bits) - (1LL << st->pts_wrap_bits-3)) ||
588  (ref < (1LL << st->pts_wrap_bits) - av_rescale(60, st->time_base.den, st->time_base.num)) ?
590 
591  first_program = av_find_program_from_stream(s, NULL, stream_index);
592 
593  if (!first_program) {
594  int default_stream_index = av_find_default_stream_index(s);
595  if (s->streams[default_stream_index]->pts_wrap_reference == AV_NOPTS_VALUE) {
596  for (i = 0; i < s->nb_streams; i++) {
597  s->streams[i]->pts_wrap_reference = pts_wrap_reference;
598  s->streams[i]->pts_wrap_behavior = pts_wrap_behavior;
599  }
600  }
601  else {
602  st->pts_wrap_reference = s->streams[default_stream_index]->pts_wrap_reference;
603  st->pts_wrap_behavior = s->streams[default_stream_index]->pts_wrap_behavior;
604  }
605  }
606  else {
607  AVProgram *program = first_program;
608  while (program) {
609  if (program->pts_wrap_reference != AV_NOPTS_VALUE) {
610  pts_wrap_reference = program->pts_wrap_reference;
611  pts_wrap_behavior = program->pts_wrap_behavior;
612  break;
613  }
614  program = av_find_program_from_stream(s, program, stream_index);
615  }
616 
617  // update every program with differing pts_wrap_reference
618  program = first_program;
619  while (program) {
620  if (program->pts_wrap_reference != pts_wrap_reference) {
621  for (i = 0; i<program->nb_stream_indexes; i++) {
622  s->streams[program->stream_index[i]]->pts_wrap_reference = pts_wrap_reference;
623  s->streams[program->stream_index[i]]->pts_wrap_behavior = pts_wrap_behavior;
624  }
625 
626  program->pts_wrap_reference = pts_wrap_reference;
627  program->pts_wrap_behavior = pts_wrap_behavior;
628  }
629  program = av_find_program_from_stream(s, program, stream_index);
630  }
631  }
632  return 1;
633 }
634 
636 {
637  int ret, i, err;
638  AVStream *st;
639 
640  for (;;) {
641  AVPacketList *pktl = s->raw_packet_buffer;
642 
643  if (pktl) {
644  *pkt = pktl->pkt;
645  st = s->streams[pkt->stream_index];
647  if ((err = probe_codec(s, st, NULL)) < 0)
648  return err;
649  if (st->request_probe <= 0) {
650  s->raw_packet_buffer = pktl->next;
652  av_free(pktl);
653  return 0;
654  }
655  }
656 
657  pkt->data = NULL;
658  pkt->size = 0;
659  av_init_packet(pkt);
660  ret = s->iformat->read_packet(s, pkt);
661  if (ret < 0) {
662  if (!pktl || ret == AVERROR(EAGAIN))
663  return ret;
664  for (i = 0; i < s->nb_streams; i++) {
665  st = s->streams[i];
666  if (st->probe_packets)
667  if ((err = probe_codec(s, st, NULL)) < 0)
668  return err;
669  av_assert0(st->request_probe <= 0);
670  }
671  continue;
672  }
673 
674  if ((s->flags & AVFMT_FLAG_DISCARD_CORRUPT) &&
675  (pkt->flags & AV_PKT_FLAG_CORRUPT)) {
677  "Dropped corrupted packet (stream = %d)\n",
678  pkt->stream_index);
679  av_free_packet(pkt);
680  continue;
681  }
682 
683  if (pkt->stream_index >= (unsigned)s->nb_streams) {
684  av_log(s, AV_LOG_ERROR, "Invalid stream index %d\n", pkt->stream_index);
685  continue;
686  }
687 
688  st = s->streams[pkt->stream_index];
689 
691  // correct first time stamps to negative values
692  if (!is_relative(st->first_dts))
693  st->first_dts = wrap_timestamp(st, st->first_dts);
694  if (!is_relative(st->start_time))
695  st->start_time = wrap_timestamp(st, st->start_time);
696  if (!is_relative(st->cur_dts))
697  st->cur_dts = wrap_timestamp(st, st->cur_dts);
698  }
699 
700  pkt->dts = wrap_timestamp(st, pkt->dts);
701  pkt->pts = wrap_timestamp(st, pkt->pts);
702 
703  force_codec_ids(s, st);
704 
705  /* TODO: audio: time filter; video: frame reordering (pts != dts) */
707  pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
708 
709  if (!pktl && st->request_probe <= 0)
710  return ret;
711 
714 
715  if ((err = probe_codec(s, st, pkt)) < 0)
716  return err;
717  }
718 }
719 
720 
721 /**********************************************************/
722 
724 {
725  if (/*avctx->codec_id == AV_CODEC_ID_AAC ||*/
726  avctx->codec_id == AV_CODEC_ID_MP1 ||
727  avctx->codec_id == AV_CODEC_ID_MP2 ||
728  avctx->codec_id == AV_CODEC_ID_MP3/* ||
729  avctx->codec_id == AV_CODEC_ID_CELT*/)
730  return 1;
731  return 0;
732 }
733 
734 /**
735  * Return the frame duration in seconds. Return 0 if not available.
736  */
737 void ff_compute_frame_duration(AVFormatContext *s, int *pnum, int *pden, AVStream *st,
739 {
740  AVRational codec_framerate = s->iformat ? st->codec->framerate :
742  int frame_size;
743 
744  *pnum = 0;
745  *pden = 0;
746  switch (st->codec->codec_type) {
747  case AVMEDIA_TYPE_VIDEO:
748  if (st->r_frame_rate.num && !pc) {
749  *pnum = st->r_frame_rate.den;
750  *pden = st->r_frame_rate.num;
751  } else if (st->time_base.num * 1000LL > st->time_base.den) {
752  *pnum = st->time_base.num;
753  *pden = st->time_base.den;
754  } else if (codec_framerate.den * 1000LL > codec_framerate.num) {
755  av_assert0(st->codec->ticks_per_frame);
756  av_reduce(pnum, pden,
757  codec_framerate.den,
758  codec_framerate.num * (int64_t)st->codec->ticks_per_frame,
759  INT_MAX);
760 
761  if (pc && pc->repeat_pict) {
762  av_assert0(s->iformat); // this may be wrong for interlaced encoding but its not used for that case
763  av_reduce(pnum, pden,
764  (*pnum) * (1LL + pc->repeat_pict),
765  (*pden),
766  INT_MAX);
767  }
768  /* If this codec can be interlaced or progressive then we need
769  * a parser to compute duration of a packet. Thus if we have
770  * no parser in such case leave duration undefined. */
771  if (st->codec->ticks_per_frame > 1 && !pc)
772  *pnum = *pden = 0;
773  }
774  break;
775  case AVMEDIA_TYPE_AUDIO:
777  if (frame_size <= 0 || st->codec->sample_rate <= 0)
778  break;
779  *pnum = frame_size;
780  *pden = st->codec->sample_rate;
781  break;
782  default:
783  break;
784  }
785 }
786 
787 static int is_intra_only(AVCodecContext *enc) {
788  const AVCodecDescriptor *desc;
789 
790  if (enc->codec_type != AVMEDIA_TYPE_VIDEO)
791  return 1;
792 
793  desc = av_codec_get_codec_descriptor(enc);
794  if (!desc) {
795  desc = avcodec_descriptor_get(enc->codec_id);
797  }
798  if (desc)
799  return !!(desc->props & AV_CODEC_PROP_INTRA_ONLY);
800  return 0;
801 }
802 
804 {
805  if (st->codec->codec_id != AV_CODEC_ID_H264) return 1;
806  if (!st->info) // if we have left find_stream_info then nb_decoded_frames won't increase anymore for stream copy
807  return 1;
808 #if CONFIG_H264_DECODER
809  if (st->codec->has_b_frames &&
811  return 1;
812 #endif
813  if (st->codec->has_b_frames<3)
814  return st->nb_decoded_frames >= 7;
815  else if (st->codec->has_b_frames<4)
816  return st->nb_decoded_frames >= 18;
817  else
818  return st->nb_decoded_frames >= 20;
819 }
820 
822 {
823  if (pktl->next)
824  return pktl->next;
825  if (pktl == s->packet_buffer_end)
826  return s->parse_queue;
827  return NULL;
828 }
829 
830 static int64_t select_from_pts_buffer(AVStream *st, int64_t *pts_buffer, int64_t dts) {
831  int onein_oneout = st->codec->codec_id != AV_CODEC_ID_H264 &&
833 
834  if(!onein_oneout) {
835  int delay = st->codec->has_b_frames;
836  int i;
837 
838  if (dts == AV_NOPTS_VALUE) {
839  int64_t best_score = INT64_MAX;
840  for (i = 0; i<delay; i++) {
841  if (st->pts_reorder_error_count[i]) {
842  int64_t score = st->pts_reorder_error[i] / st->pts_reorder_error_count[i];
843  if (score < best_score) {
844  best_score = score;
845  dts = pts_buffer[i];
846  }
847  }
848  }
849  } else {
850  for (i = 0; i<delay; i++) {
851  if (pts_buffer[i] != AV_NOPTS_VALUE) {
852  int64_t diff = FFABS(pts_buffer[i] - dts)
853  + (uint64_t)st->pts_reorder_error[i];
854  diff = FFMAX(diff, st->pts_reorder_error[i]);
855  st->pts_reorder_error[i] = diff;
856  st->pts_reorder_error_count[i]++;
857  if (st->pts_reorder_error_count[i] > 250) {
858  st->pts_reorder_error[i] >>= 1;
859  st->pts_reorder_error_count[i] >>= 1;
860  }
861  }
862  }
863  }
864  }
865 
866  if (dts == AV_NOPTS_VALUE)
867  dts = pts_buffer[0];
868 
869  return dts;
870 }
871 
872 static void update_initial_timestamps(AVFormatContext *s, int stream_index,
873  int64_t dts, int64_t pts, AVPacket *pkt)
874 {
875  AVStream *st = s->streams[stream_index];
877  int64_t pts_buffer[MAX_REORDER_DELAY+1];
878  int64_t shift;
879  int i, delay;
880 
881  if (st->first_dts != AV_NOPTS_VALUE ||
882  dts == AV_NOPTS_VALUE ||
883  st->cur_dts == AV_NOPTS_VALUE ||
884  is_relative(dts))
885  return;
886 
887  delay = st->codec->has_b_frames;
888  st->first_dts = dts - (st->cur_dts - RELATIVE_TS_BASE);
889  st->cur_dts = dts;
890  shift = st->first_dts - RELATIVE_TS_BASE;
891 
892  for (i = 0; i<MAX_REORDER_DELAY+1; i++)
893  pts_buffer[i] = AV_NOPTS_VALUE;
894 
895  if (is_relative(pts))
896  pts += shift;
897 
898  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
899  if (pktl->pkt.stream_index != stream_index)
900  continue;
901  if (is_relative(pktl->pkt.pts))
902  pktl->pkt.pts += shift;
903 
904  if (is_relative(pktl->pkt.dts))
905  pktl->pkt.dts += shift;
906 
907  if (st->start_time == AV_NOPTS_VALUE && pktl->pkt.pts != AV_NOPTS_VALUE)
908  st->start_time = pktl->pkt.pts;
909 
910  if (pktl->pkt.pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY && has_decode_delay_been_guessed(st)) {
911  pts_buffer[0] = pktl->pkt.pts;
912  for (i = 0; i<delay && pts_buffer[i] > pts_buffer[i + 1]; i++)
913  FFSWAP(int64_t, pts_buffer[i], pts_buffer[i + 1]);
914 
915  pktl->pkt.dts = select_from_pts_buffer(st, pts_buffer, pktl->pkt.dts);
916  }
917  }
918 
919  if (st->start_time == AV_NOPTS_VALUE)
920  st->start_time = pts;
921 }
922 
924  int stream_index, int duration)
925 {
927  int64_t cur_dts = RELATIVE_TS_BASE;
928 
929  if (st->first_dts != AV_NOPTS_VALUE) {
931  return;
933  cur_dts = st->first_dts;
934  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
935  if (pktl->pkt.stream_index == stream_index) {
936  if (pktl->pkt.pts != pktl->pkt.dts ||
937  pktl->pkt.dts != AV_NOPTS_VALUE ||
938  pktl->pkt.duration)
939  break;
940  cur_dts -= duration;
941  }
942  }
943  if (pktl && pktl->pkt.dts != st->first_dts) {
944  av_log(s, AV_LOG_DEBUG, "first_dts %s not matching first dts %s (pts %s, duration %d) in the queue\n",
945  av_ts2str(st->first_dts), av_ts2str(pktl->pkt.dts), av_ts2str(pktl->pkt.pts), pktl->pkt.duration);
946  return;
947  }
948  if (!pktl) {
949  av_log(s, AV_LOG_DEBUG, "first_dts %s but no packet with dts in the queue\n", av_ts2str(st->first_dts));
950  return;
951  }
952  pktl = s->packet_buffer ? s->packet_buffer : s->parse_queue;
953  st->first_dts = cur_dts;
954  } else if (st->cur_dts != RELATIVE_TS_BASE)
955  return;
956 
957  for (; pktl; pktl = get_next_pkt(s, st, pktl)) {
958  if (pktl->pkt.stream_index != stream_index)
959  continue;
960  if (pktl->pkt.pts == pktl->pkt.dts &&
961  (pktl->pkt.dts == AV_NOPTS_VALUE || pktl->pkt.dts == st->first_dts) &&
962  !pktl->pkt.duration) {
963  pktl->pkt.dts = cur_dts;
964  if (!st->codec->has_b_frames)
965  pktl->pkt.pts = cur_dts;
966 // if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO)
967  pktl->pkt.duration = duration;
968  } else
969  break;
970  cur_dts = pktl->pkt.dts + pktl->pkt.duration;
971  }
972  if (!pktl)
973  st->cur_dts = cur_dts;
974 }
975 
978 {
979  int num, den, presentation_delayed, delay, i;
980  int64_t offset;
982  int onein_oneout = st->codec->codec_id != AV_CODEC_ID_H264 &&
984 
985  if (s->flags & AVFMT_FLAG_NOFILLIN)
986  return;
987 
988  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && pkt->dts != AV_NOPTS_VALUE) {
989  if (pkt->dts == pkt->pts && st->last_dts_for_order_check != AV_NOPTS_VALUE) {
990  if (st->last_dts_for_order_check <= pkt->dts) {
991  st->dts_ordered++;
992  } else {
994  "DTS %"PRIi64" < %"PRIi64" out of order\n",
995  pkt->dts,
997  st->dts_misordered++;
998  }
999  if (st->dts_ordered + st->dts_misordered > 250) {
1000  st->dts_ordered >>= 1;
1001  st->dts_misordered >>= 1;
1002  }
1003  }
1004 
1005  st->last_dts_for_order_check = pkt->dts;
1006  if (st->dts_ordered < 8*st->dts_misordered && pkt->dts == pkt->pts)
1007  pkt->dts = AV_NOPTS_VALUE;
1008  }
1009 
1010  if ((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
1011  pkt->dts = AV_NOPTS_VALUE;
1012 
1013  if (pc && pc->pict_type == AV_PICTURE_TYPE_B
1014  && !st->codec->has_b_frames)
1015  //FIXME Set low_delay = 0 when has_b_frames = 1
1016  st->codec->has_b_frames = 1;
1017 
1018  /* do we have a video B-frame ? */
1019  delay = st->codec->has_b_frames;
1020  presentation_delayed = 0;
1021 
1022  /* XXX: need has_b_frame, but cannot get it if the codec is
1023  * not initialized */
1024  if (delay &&
1025  pc && pc->pict_type != AV_PICTURE_TYPE_B)
1026  presentation_delayed = 1;
1027 
1028  if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&
1029  st->pts_wrap_bits < 63 &&
1030  pkt->dts - (1LL << (st->pts_wrap_bits - 1)) > pkt->pts) {
1031  if (is_relative(st->cur_dts) || pkt->dts - (1LL<<(st->pts_wrap_bits - 1)) > st->cur_dts) {
1032  pkt->dts -= 1LL << st->pts_wrap_bits;
1033  } else
1034  pkt->pts += 1LL << st->pts_wrap_bits;
1035  }
1036 
1037  /* Some MPEG-2 in MPEG-PS lack dts (issue #171 / input_file.mpg).
1038  * We take the conservative approach and discard both.
1039  * Note: If this is misbehaving for an H.264 file, then possibly
1040  * presentation_delayed is not set correctly. */
1041  if (delay == 1 && pkt->dts == pkt->pts &&
1042  pkt->dts != AV_NOPTS_VALUE && presentation_delayed) {
1043  av_log(s, AV_LOG_DEBUG, "invalid dts/pts combination %"PRIi64"\n", pkt->dts);
1044  if ( strcmp(s->iformat->name, "mov,mp4,m4a,3gp,3g2,mj2")
1045  && strcmp(s->iformat->name, "flv")) // otherwise we discard correct timestamps for vc1-wmapro.ism
1046  pkt->dts = AV_NOPTS_VALUE;
1047  }
1048 
1049  duration = av_mul_q((AVRational) {pkt->duration, 1}, st->time_base);
1050  if (pkt->duration == 0) {
1051  ff_compute_frame_duration(s, &num, &den, st, pc, pkt);
1052  if (den && num) {
1053  duration = (AVRational) {num, den};
1054  pkt->duration = av_rescale_rnd(1,
1055  num * (int64_t) st->time_base.den,
1056  den * (int64_t) st->time_base.num,
1057  AV_ROUND_DOWN);
1058  }
1059  }
1060 
1061  if (pkt->duration != 0 && (s->packet_buffer || s->parse_queue))
1062  update_initial_durations(s, st, pkt->stream_index, pkt->duration);
1063 
1064  /* Correct timestamps with byte offset if demuxers only have timestamps
1065  * on packet boundaries */
1066  if (pc && st->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size) {
1067  /* this will estimate bitrate based on this frame's duration and size */
1068  offset = av_rescale(pc->offset, pkt->duration, pkt->size);
1069  if (pkt->pts != AV_NOPTS_VALUE)
1070  pkt->pts += offset;
1071  if (pkt->dts != AV_NOPTS_VALUE)
1072  pkt->dts += offset;
1073  }
1074 
1075  /* This may be redundant, but it should not hurt. */
1076  if (pkt->dts != AV_NOPTS_VALUE &&
1077  pkt->pts != AV_NOPTS_VALUE &&
1078  pkt->pts > pkt->dts)
1079  presentation_delayed = 1;
1080 
1081  av_dlog(NULL,
1082  "IN delayed:%d pts:%s, dts:%s cur_dts:%s st:%d pc:%p duration:%d delay:%d onein_oneout:%d\n",
1083  presentation_delayed, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts),
1084  pkt->stream_index, pc, pkt->duration, delay, onein_oneout);
1085  /* Interpolate PTS and DTS if they are not present. We skip H264
1086  * currently because delay and has_b_frames are not reliably set. */
1087  if ((delay == 0 || (delay == 1 && pc)) &&
1088  onein_oneout) {
1089  if (presentation_delayed) {
1090  /* DTS = decompression timestamp */
1091  /* PTS = presentation timestamp */
1092  if (pkt->dts == AV_NOPTS_VALUE)
1093  pkt->dts = st->last_IP_pts;
1094  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1095  if (pkt->dts == AV_NOPTS_VALUE)
1096  pkt->dts = st->cur_dts;
1097 
1098  /* This is tricky: the dts must be incremented by the duration
1099  * of the frame we are displaying, i.e. the last I- or P-frame. */
1100  if (st->last_IP_duration == 0)
1101  st->last_IP_duration = pkt->duration;
1102  if (pkt->dts != AV_NOPTS_VALUE)
1103  st->cur_dts = pkt->dts + st->last_IP_duration;
1104  st->last_IP_duration = pkt->duration;
1105  st->last_IP_pts = pkt->pts;
1106  /* Cannot compute PTS if not present (we can compute it only
1107  * by knowing the future. */
1108  } else if (pkt->pts != AV_NOPTS_VALUE ||
1109  pkt->dts != AV_NOPTS_VALUE ||
1110  pkt->duration ) {
1111 
1112  /* presentation is not delayed : PTS and DTS are the same */
1113  if (pkt->pts == AV_NOPTS_VALUE)
1114  pkt->pts = pkt->dts;
1116  pkt->pts, pkt);
1117  if (pkt->pts == AV_NOPTS_VALUE)
1118  pkt->pts = st->cur_dts;
1119  pkt->dts = pkt->pts;
1120  if (pkt->pts != AV_NOPTS_VALUE)
1121  st->cur_dts = av_add_stable(st->time_base, pkt->pts, duration, 1);
1122  }
1123  }
1124 
1125  if (pkt->pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY && has_decode_delay_been_guessed(st)) {
1126  st->pts_buffer[0] = pkt->pts;
1127  for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
1128  FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
1129 
1130  pkt->dts = select_from_pts_buffer(st, st->pts_buffer, pkt->dts);
1131  }
1132  // We skipped it above so we try here.
1133  if (!onein_oneout)
1134  // This should happen on the first packet
1135  update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts, pkt);
1136  if (pkt->dts > st->cur_dts)
1137  st->cur_dts = pkt->dts;
1138 
1139  av_dlog(NULL, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s\n",
1140  presentation_delayed, delay, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts));
1141 
1142  /* update flags */
1143  if (is_intra_only(st->codec))
1144  pkt->flags |= AV_PKT_FLAG_KEY;
1145  if (pc)
1147 }
1148 
1149 static void free_packet_buffer(AVPacketList **pkt_buf, AVPacketList **pkt_buf_end)
1150 {
1151  while (*pkt_buf) {
1152  AVPacketList *pktl = *pkt_buf;
1153  *pkt_buf = pktl->next;
1154  av_free_packet(&pktl->pkt);
1155  av_freep(&pktl);
1156  }
1157  *pkt_buf_end = NULL;
1158 }
1159 
1160 /**
1161  * Parse a packet, add all split parts to parse_queue.
1162  *
1163  * @param pkt Packet to parse, NULL when flushing the parser at end of stream.
1164  */
1165 static int parse_packet(AVFormatContext *s, AVPacket *pkt, int stream_index)
1166 {
1167  AVPacket out_pkt = { 0 }, flush_pkt = { 0 };
1168  AVStream *st = s->streams[stream_index];
1169  uint8_t *data = pkt ? pkt->data : NULL;
1170  int size = pkt ? pkt->size : 0;
1171  int ret = 0, got_output = 0;
1172 
1173  if (!pkt) {
1175  pkt = &flush_pkt;
1176  got_output = 1;
1177  } else if (!size && st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
1178  // preserve 0-size sync packets
1179  compute_pkt_fields(s, st, st->parser, pkt);
1180  }
1181 
1182  while (size > 0 || (pkt == &flush_pkt && got_output)) {
1183  int len;
1184 
1185  av_init_packet(&out_pkt);
1186  len = av_parser_parse2(st->parser, st->codec,
1187  &out_pkt.data, &out_pkt.size, data, size,
1188  pkt->pts, pkt->dts, pkt->pos);
1189 
1190  pkt->pts = pkt->dts = AV_NOPTS_VALUE;
1191  pkt->pos = -1;
1192  /* increment read pointer */
1193  data += len;
1194  size -= len;
1195 
1196  got_output = !!out_pkt.size;
1197 
1198  if (!out_pkt.size)
1199  continue;
1200 
1201  if (pkt->side_data) {
1202  out_pkt.side_data = pkt->side_data;
1203  out_pkt.side_data_elems = pkt->side_data_elems;
1204  pkt->side_data = NULL;
1205  pkt->side_data_elems = 0;
1206  }
1207 
1208  /* set the duration */
1209  out_pkt.duration = 0;
1210  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1211  if (st->codec->sample_rate > 0) {
1212  out_pkt.duration =
1214  (AVRational) { 1, st->codec->sample_rate },
1215  st->time_base,
1216  AV_ROUND_DOWN);
1217  }
1218  }
1219 
1220  out_pkt.stream_index = st->index;
1221  out_pkt.pts = st->parser->pts;
1222  out_pkt.dts = st->parser->dts;
1223  out_pkt.pos = st->parser->pos;
1224 
1226  out_pkt.pos = st->parser->frame_offset;
1227 
1228  if (st->parser->key_frame == 1 ||
1229  (st->parser->key_frame == -1 &&
1231  out_pkt.flags |= AV_PKT_FLAG_KEY;
1232 
1233  if (st->parser->key_frame == -1 && st->parser->pict_type ==AV_PICTURE_TYPE_NONE && (pkt->flags&AV_PKT_FLAG_KEY))
1234  out_pkt.flags |= AV_PKT_FLAG_KEY;
1235 
1236  compute_pkt_fields(s, st, st->parser, &out_pkt);
1237 
1238  if (out_pkt.data == pkt->data && out_pkt.size == pkt->size) {
1239  out_pkt.buf = pkt->buf;
1240  pkt->buf = NULL;
1241 #if FF_API_DESTRUCT_PACKET
1243  out_pkt.destruct = pkt->destruct;
1244  pkt->destruct = NULL;
1246 #endif
1247  }
1248  if ((ret = av_dup_packet(&out_pkt)) < 0)
1249  goto fail;
1250 
1251  if (!add_to_pktbuf(&s->parse_queue, &out_pkt, &s->parse_queue_end)) {
1252  av_free_packet(&out_pkt);
1253  ret = AVERROR(ENOMEM);
1254  goto fail;
1255  }
1256  }
1257 
1258  /* end of the stream => close and free the parser */
1259  if (pkt == &flush_pkt) {
1260  av_parser_close(st->parser);
1261  st->parser = NULL;
1262  }
1263 
1264 fail:
1266  return ret;
1267 }
1268 
1269 static int read_from_packet_buffer(AVPacketList **pkt_buffer,
1270  AVPacketList **pkt_buffer_end,
1271  AVPacket *pkt)
1272 {
1273  AVPacketList *pktl;
1274  av_assert0(*pkt_buffer);
1275  pktl = *pkt_buffer;
1276  *pkt = pktl->pkt;
1277  *pkt_buffer = pktl->next;
1278  if (!pktl->next)
1279  *pkt_buffer_end = NULL;
1280  av_freep(&pktl);
1281  return 0;
1282 }
1283 
1284 static int64_t ts_to_samples(AVStream *st, int64_t ts)
1285 {
1286  return av_rescale(ts, st->time_base.num * st->codec->sample_rate, st->time_base.den);
1287 }
1288 
1290 {
1291  int ret = 0, i, got_packet = 0;
1292  AVDictionary *metadata = NULL;
1293 
1294  av_init_packet(pkt);
1295 
1296  while (!got_packet && !s->parse_queue) {
1297  AVStream *st;
1298  AVPacket cur_pkt;
1299 
1300  /* read next packet */
1301  ret = ff_read_packet(s, &cur_pkt);
1302  if (ret < 0) {
1303  if (ret == AVERROR(EAGAIN))
1304  return ret;
1305  /* flush the parsers */
1306  for (i = 0; i < s->nb_streams; i++) {
1307  st = s->streams[i];
1308  if (st->parser && st->need_parsing)
1309  parse_packet(s, NULL, st->index);
1310  }
1311  /* all remaining packets are now in parse_queue =>
1312  * really terminate parsing */
1313  break;
1314  }
1315  ret = 0;
1316  st = s->streams[cur_pkt.stream_index];
1317 
1318  if (cur_pkt.pts != AV_NOPTS_VALUE &&
1319  cur_pkt.dts != AV_NOPTS_VALUE &&
1320  cur_pkt.pts < cur_pkt.dts) {
1322  "Invalid timestamps stream=%d, pts=%s, dts=%s, size=%d\n",
1323  cur_pkt.stream_index,
1324  av_ts2str(cur_pkt.pts),
1325  av_ts2str(cur_pkt.dts),
1326  cur_pkt.size);
1327  }
1328  if (s->debug & FF_FDEBUG_TS)
1329  av_log(s, AV_LOG_DEBUG,
1330  "ff_read_packet stream=%d, pts=%s, dts=%s, size=%d, duration=%d, flags=%d\n",
1331  cur_pkt.stream_index,
1332  av_ts2str(cur_pkt.pts),
1333  av_ts2str(cur_pkt.dts),
1334  cur_pkt.size, cur_pkt.duration, cur_pkt.flags);
1335 
1336  if (st->need_parsing && !st->parser && !(s->flags & AVFMT_FLAG_NOPARSE)) {
1337  st->parser = av_parser_init(st->codec->codec_id);
1338  if (!st->parser) {
1339  av_log(s, AV_LOG_VERBOSE, "parser not found for codec "
1340  "%s, packets or times may be invalid.\n",
1342  /* no parser available: just output the raw packets */
1344  } else if (st->need_parsing == AVSTREAM_PARSE_HEADERS)
1346  else if (st->need_parsing == AVSTREAM_PARSE_FULL_ONCE)
1347  st->parser->flags |= PARSER_FLAG_ONCE;
1348  else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW)
1350  }
1351 
1352  if (!st->need_parsing || !st->parser) {
1353  /* no parsing needed: we just output the packet as is */
1354  *pkt = cur_pkt;
1355  compute_pkt_fields(s, st, NULL, pkt);
1356  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) &&
1357  (pkt->flags & AV_PKT_FLAG_KEY) && pkt->dts != AV_NOPTS_VALUE) {
1358  ff_reduce_index(s, st->index);
1359  av_add_index_entry(st, pkt->pos, pkt->dts,
1360  0, 0, AVINDEX_KEYFRAME);
1361  }
1362  got_packet = 1;
1363  } else if (st->discard < AVDISCARD_ALL) {
1364  if ((ret = parse_packet(s, &cur_pkt, cur_pkt.stream_index)) < 0)
1365  return ret;
1366  } else {
1367  /* free packet */
1368  av_free_packet(&cur_pkt);
1369  }
1370  if (pkt->flags & AV_PKT_FLAG_KEY)
1371  st->skip_to_keyframe = 0;
1372  if (st->skip_to_keyframe) {
1373  av_free_packet(&cur_pkt);
1374  if (got_packet) {
1375  *pkt = cur_pkt;
1376  }
1377  got_packet = 0;
1378  }
1379  }
1380 
1381  if (!got_packet && s->parse_queue)
1383 
1384  if (ret >= 0) {
1385  AVStream *st = s->streams[pkt->stream_index];
1386  int discard_padding = 0;
1387  if (st->first_discard_sample && pkt->pts != AV_NOPTS_VALUE) {
1388  int64_t pts = pkt->pts - (is_relative(pkt->pts) ? RELATIVE_TS_BASE : 0);
1389  int64_t sample = ts_to_samples(st, pts);
1390  int duration = ts_to_samples(st, pkt->duration);
1391  int64_t end_sample = sample + duration;
1392  if (duration > 0 && end_sample >= st->first_discard_sample &&
1393  sample < st->last_discard_sample)
1394  discard_padding = FFMIN(end_sample - st->first_discard_sample, duration);
1395  }
1396  if (st->skip_samples || discard_padding) {
1398  if (p) {
1399  AV_WL32(p, st->skip_samples);
1400  AV_WL32(p + 4, discard_padding);
1401  av_log(s, AV_LOG_DEBUG, "demuxer injecting skip %d\n", st->skip_samples);
1402  }
1403  st->skip_samples = 0;
1404  }
1405 
1406  if (st->inject_global_side_data) {
1407  for (i = 0; i < st->nb_side_data; i++) {
1408  AVPacketSideData *src_sd = &st->side_data[i];
1409  uint8_t *dst_data;
1410 
1411  if (av_packet_get_side_data(pkt, src_sd->type, NULL))
1412  continue;
1413 
1414  dst_data = av_packet_new_side_data(pkt, src_sd->type, src_sd->size);
1415  if (!dst_data) {
1416  av_log(s, AV_LOG_WARNING, "Could not inject global side data\n");
1417  continue;
1418  }
1419 
1420  memcpy(dst_data, src_sd->data, src_sd->size);
1421  }
1422  st->inject_global_side_data = 0;
1423  }
1424 
1425  if (!(s->flags & AVFMT_FLAG_KEEP_SIDE_DATA))
1427  }
1428 
1429  av_opt_get_dict_val(s, "metadata", AV_OPT_SEARCH_CHILDREN, &metadata);
1430  if (metadata) {
1432  av_dict_copy(&s->metadata, metadata, 0);
1433  av_dict_free(&metadata);
1434  av_opt_set_dict_val(s, "metadata", NULL, AV_OPT_SEARCH_CHILDREN);
1435  }
1436 
1437  if (s->debug & FF_FDEBUG_TS)
1438  av_log(s, AV_LOG_DEBUG,
1439  "read_frame_internal stream=%d, pts=%s, dts=%s, "
1440  "size=%d, duration=%d, flags=%d\n",
1441  pkt->stream_index,
1442  av_ts2str(pkt->pts),
1443  av_ts2str(pkt->dts),
1444  pkt->size, pkt->duration, pkt->flags);
1445 
1446  return ret;
1447 }
1448 
1450 {
1451  const int genpts = s->flags & AVFMT_FLAG_GENPTS;
1452  int eof = 0;
1453  int ret;
1454  AVStream *st;
1455 
1456  if (!genpts) {
1457  ret = s->packet_buffer
1459  &s->packet_buffer_end, pkt)
1460  : read_frame_internal(s, pkt);
1461  if (ret < 0)
1462  return ret;
1463  goto return_packet;
1464  }
1465 
1466  for (;;) {
1467  AVPacketList *pktl = s->packet_buffer;
1468 
1469  if (pktl) {
1470  AVPacket *next_pkt = &pktl->pkt;
1471 
1472  if (next_pkt->dts != AV_NOPTS_VALUE) {
1473  int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits;
1474  // last dts seen for this stream. if any of packets following
1475  // current one had no dts, we will set this to AV_NOPTS_VALUE.
1476  int64_t last_dts = next_pkt->dts;
1477  while (pktl && next_pkt->pts == AV_NOPTS_VALUE) {
1478  if (pktl->pkt.stream_index == next_pkt->stream_index &&
1479  (av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2LL << (wrap_bits - 1)) < 0)) {
1480  if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2LL << (wrap_bits - 1))) {
1481  // not B-frame
1482  next_pkt->pts = pktl->pkt.dts;
1483  }
1484  if (last_dts != AV_NOPTS_VALUE) {
1485  // Once last dts was set to AV_NOPTS_VALUE, we don't change it.
1486  last_dts = pktl->pkt.dts;
1487  }
1488  }
1489  pktl = pktl->next;
1490  }
1491  if (eof && next_pkt->pts == AV_NOPTS_VALUE && last_dts != AV_NOPTS_VALUE) {
1492  // Fixing the last reference frame had none pts issue (For MXF etc).
1493  // We only do this when
1494  // 1. eof.
1495  // 2. we are not able to resolve a pts value for current packet.
1496  // 3. the packets for this stream at the end of the files had valid dts.
1497  next_pkt->pts = last_dts + next_pkt->duration;
1498  }
1499  pktl = s->packet_buffer;
1500  }
1501 
1502  /* read packet from packet buffer, if there is data */
1503  st = s->streams[next_pkt->stream_index];
1504  if (!(next_pkt->pts == AV_NOPTS_VALUE && st->discard < AVDISCARD_ALL &&
1505  next_pkt->dts != AV_NOPTS_VALUE && !eof)) {
1507  &s->packet_buffer_end, pkt);
1508  goto return_packet;
1509  }
1510  }
1511 
1512  ret = read_frame_internal(s, pkt);
1513  if (ret < 0) {
1514  if (pktl && ret != AVERROR(EAGAIN)) {
1515  eof = 1;
1516  continue;
1517  } else
1518  return ret;
1519  }
1520 
1522  &s->packet_buffer_end)) < 0)
1523  return AVERROR(ENOMEM);
1524  }
1525 
1526 return_packet:
1527 
1528  st = s->streams[pkt->stream_index];
1529  if ((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & AV_PKT_FLAG_KEY) {
1530  ff_reduce_index(s, st->index);
1531  av_add_index_entry(st, pkt->pos, pkt->dts, 0, 0, AVINDEX_KEYFRAME);
1532  }
1533 
1534  if (is_relative(pkt->dts))
1535  pkt->dts -= RELATIVE_TS_BASE;
1536  if (is_relative(pkt->pts))
1537  pkt->pts -= RELATIVE_TS_BASE;
1538 
1539  return ret;
1540 }
1541 
1542 /* XXX: suppress the packet queue */
1544 {
1548 
1550 }
1551 
1552 /*******************************************************/
1553 /* seek support */
1554 
1556 {
1557  int i;
1558  AVStream *st;
1559  int best_stream = 0;
1560  int best_score = -1;
1561 
1562  if (s->nb_streams <= 0)
1563  return -1;
1564  for (i = 0; i < s->nb_streams; i++) {
1565  int score = 0;
1566  st = s->streams[i];
1567  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
1569  if (!st->codec->width && !st->codec->height && !st->codec_info_nb_frames)
1570  score += 25;
1571  else
1572  score += 100;
1573  }
1574  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1575  if (!st->codec->sample_rate && !st->codec_info_nb_frames)
1576  score += 12;
1577  else
1578  score += 50;
1579  }
1580 
1581  if (score > best_score) {
1582  best_score = score;
1583  best_stream = i;
1584  }
1585  }
1586  return best_stream;
1587 }
1588 
1589 /** Flush the frame reader. */
1591 {
1592  AVStream *st;
1593  int i, j;
1594 
1595  flush_packet_queue(s);
1596 
1597  /* Reset read state for each stream. */
1598  for (i = 0; i < s->nb_streams; i++) {
1599  st = s->streams[i];
1600 
1601  if (st->parser) {
1602  av_parser_close(st->parser);
1603  st->parser = NULL;
1604  }
1607  if (st->first_dts == AV_NOPTS_VALUE)
1608  st->cur_dts = RELATIVE_TS_BASE;
1609  else
1610  /* We set the current DTS to an unspecified origin. */
1611  st->cur_dts = AV_NOPTS_VALUE;
1612 
1614 
1615  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
1616  st->pts_buffer[j] = AV_NOPTS_VALUE;
1617 
1619  st->inject_global_side_data = 1;
1620  }
1621 }
1622 
1623 void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
1624 {
1625  int i;
1626 
1627  for (i = 0; i < s->nb_streams; i++) {
1628  AVStream *st = s->streams[i];
1629 
1630  st->cur_dts =
1631  av_rescale(timestamp,
1632  st->time_base.den * (int64_t) ref_st->time_base.num,
1633  st->time_base.num * (int64_t) ref_st->time_base.den);
1634  }
1635 }
1636 
1637 void ff_reduce_index(AVFormatContext *s, int stream_index)
1638 {
1639  AVStream *st = s->streams[stream_index];
1640  unsigned int max_entries = s->max_index_size / sizeof(AVIndexEntry);
1641 
1642  if ((unsigned) st->nb_index_entries >= max_entries) {
1643  int i;
1644  for (i = 0; 2 * i < st->nb_index_entries; i++)
1645  st->index_entries[i] = st->index_entries[2 * i];
1646  st->nb_index_entries = i;
1647  }
1648 }
1649 
1650 int ff_add_index_entry(AVIndexEntry **index_entries,
1651  int *nb_index_entries,
1652  unsigned int *index_entries_allocated_size,
1653  int64_t pos, int64_t timestamp,
1654  int size, int distance, int flags)
1655 {
1656  AVIndexEntry *entries, *ie;
1657  int index;
1658 
1659  if ((unsigned) *nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
1660  return -1;
1661 
1662  if (timestamp == AV_NOPTS_VALUE)
1663  return AVERROR(EINVAL);
1664 
1665  if (size < 0 || size > 0x3FFFFFFF)
1666  return AVERROR(EINVAL);
1667 
1668  if (is_relative(timestamp)) //FIXME this maintains previous behavior but we should shift by the correct offset once known
1669  timestamp -= RELATIVE_TS_BASE;
1670 
1671  entries = av_fast_realloc(*index_entries,
1672  index_entries_allocated_size,
1673  (*nb_index_entries + 1) *
1674  sizeof(AVIndexEntry));
1675  if (!entries)
1676  return -1;
1677 
1678  *index_entries = entries;
1679 
1680  index = ff_index_search_timestamp(*index_entries, *nb_index_entries,
1681  timestamp, AVSEEK_FLAG_ANY);
1682 
1683  if (index < 0) {
1684  index = (*nb_index_entries)++;
1685  ie = &entries[index];
1686  av_assert0(index == 0 || ie[-1].timestamp < timestamp);
1687  } else {
1688  ie = &entries[index];
1689  if (ie->timestamp != timestamp) {
1690  if (ie->timestamp <= timestamp)
1691  return -1;
1692  memmove(entries + index + 1, entries + index,
1693  sizeof(AVIndexEntry) * (*nb_index_entries - index));
1694  (*nb_index_entries)++;
1695  } else if (ie->pos == pos && distance < ie->min_distance)
1696  // do not reduce the distance
1697  distance = ie->min_distance;
1698  }
1699 
1700  ie->pos = pos;
1701  ie->timestamp = timestamp;
1702  ie->min_distance = distance;
1703  ie->size = size;
1704  ie->flags = flags;
1705 
1706  return index;
1707 }
1708 
1709 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1710  int size, int distance, int flags)
1711 {
1712  timestamp = wrap_timestamp(st, timestamp);
1714  &st->index_entries_allocated_size, pos,
1715  timestamp, size, distance, flags);
1716 }
1717 
1718 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
1719  int64_t wanted_timestamp, int flags)
1720 {
1721  int a, b, m;
1722  int64_t timestamp;
1723 
1724  a = -1;
1725  b = nb_entries;
1726 
1727  // Optimize appending index entries at the end.
1728  if (b && entries[b - 1].timestamp < wanted_timestamp)
1729  a = b - 1;
1730 
1731  while (b - a > 1) {
1732  m = (a + b) >> 1;
1733  timestamp = entries[m].timestamp;
1734  if (timestamp >= wanted_timestamp)
1735  b = m;
1736  if (timestamp <= wanted_timestamp)
1737  a = m;
1738  }
1739  m = (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
1740 
1741  if (!(flags & AVSEEK_FLAG_ANY))
1742  while (m >= 0 && m < nb_entries &&
1743  !(entries[m].flags & AVINDEX_KEYFRAME))
1744  m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
1745 
1746  if (m == nb_entries)
1747  return -1;
1748  return m;
1749 }
1750 
1751 int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp, int flags)
1752 {
1754  wanted_timestamp, flags);
1755 }
1756 
1757 static int64_t ff_read_timestamp(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit,
1758  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
1759 {
1760  int64_t ts = read_timestamp(s, stream_index, ppos, pos_limit);
1761  if (stream_index >= 0)
1762  ts = wrap_timestamp(s->streams[stream_index], ts);
1763  return ts;
1764 }
1765 
1766 int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
1767  int64_t target_ts, int flags)
1768 {
1769  AVInputFormat *avif = s->iformat;
1770  int64_t av_uninit(pos_min), av_uninit(pos_max), pos, pos_limit;
1771  int64_t ts_min, ts_max, ts;
1772  int index;
1773  int64_t ret;
1774  AVStream *st;
1775 
1776  if (stream_index < 0)
1777  return -1;
1778 
1779  av_dlog(s, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
1780 
1781  ts_max =
1782  ts_min = AV_NOPTS_VALUE;
1783  pos_limit = -1; // GCC falsely says it may be uninitialized.
1784 
1785  st = s->streams[stream_index];
1786  if (st->index_entries) {
1787  AVIndexEntry *e;
1788 
1789  /* FIXME: Whole function must be checked for non-keyframe entries in
1790  * index case, especially read_timestamp(). */
1791  index = av_index_search_timestamp(st, target_ts,
1792  flags | AVSEEK_FLAG_BACKWARD);
1793  index = FFMAX(index, 0);
1794  e = &st->index_entries[index];
1795 
1796  if (e->timestamp <= target_ts || e->pos == e->min_distance) {
1797  pos_min = e->pos;
1798  ts_min = e->timestamp;
1799  av_dlog(s, "using cached pos_min=0x%"PRIx64" dts_min=%s\n",
1800  pos_min, av_ts2str(ts_min));
1801  } else {
1802  av_assert1(index == 0);
1803  }
1804 
1805  index = av_index_search_timestamp(st, target_ts,
1806  flags & ~AVSEEK_FLAG_BACKWARD);
1807  av_assert0(index < st->nb_index_entries);
1808  if (index >= 0) {
1809  e = &st->index_entries[index];
1810  av_assert1(e->timestamp >= target_ts);
1811  pos_max = e->pos;
1812  ts_max = e->timestamp;
1813  pos_limit = pos_max - e->min_distance;
1814  av_dlog(s, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64
1815  " dts_max=%s\n", pos_max, pos_limit, av_ts2str(ts_max));
1816  }
1817  }
1818 
1819  pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
1820  ts_min, ts_max, flags, &ts, avif->read_timestamp);
1821  if (pos < 0)
1822  return -1;
1823 
1824  /* do the seek */
1825  if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
1826  return ret;
1827 
1829  ff_update_cur_dts(s, st, ts);
1830 
1831  return 0;
1832 }
1833 
1834 int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
1835  int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ))
1836 {
1837  int64_t step = 1024;
1838  int64_t limit, ts_max;
1839  int64_t filesize = avio_size(s->pb);
1840  int64_t pos_max = filesize - 1;
1841  do {
1842  limit = pos_max;
1843  pos_max = FFMAX(0, (pos_max) - step);
1844  ts_max = ff_read_timestamp(s, stream_index,
1845  &pos_max, limit, read_timestamp);
1846  step += step;
1847  } while (ts_max == AV_NOPTS_VALUE && 2*limit > step);
1848  if (ts_max == AV_NOPTS_VALUE)
1849  return -1;
1850 
1851  for (;;) {
1852  int64_t tmp_pos = pos_max + 1;
1853  int64_t tmp_ts = ff_read_timestamp(s, stream_index,
1854  &tmp_pos, INT64_MAX, read_timestamp);
1855  if (tmp_ts == AV_NOPTS_VALUE)
1856  break;
1857  av_assert0(tmp_pos > pos_max);
1858  ts_max = tmp_ts;
1859  pos_max = tmp_pos;
1860  if (tmp_pos >= filesize)
1861  break;
1862  }
1863 
1864  if (ts)
1865  *ts = ts_max;
1866  if (pos)
1867  *pos = pos_max;
1868 
1869  return 0;
1870 }
1871 
1872 int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts,
1873  int64_t pos_min, int64_t pos_max, int64_t pos_limit,
1874  int64_t ts_min, int64_t ts_max,
1875  int flags, int64_t *ts_ret,
1876  int64_t (*read_timestamp)(struct AVFormatContext *, int,
1877  int64_t *, int64_t))
1878 {
1879  int64_t pos, ts;
1880  int64_t start_pos;
1881  int no_change;
1882  int ret;
1883 
1884  av_dlog(s, "gen_seek: %d %s\n", stream_index, av_ts2str(target_ts));
1885 
1886  if (ts_min == AV_NOPTS_VALUE) {
1887  pos_min = s->data_offset;
1888  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
1889  if (ts_min == AV_NOPTS_VALUE)
1890  return -1;
1891  }
1892 
1893  if (ts_min >= target_ts) {
1894  *ts_ret = ts_min;
1895  return pos_min;
1896  }
1897 
1898  if (ts_max == AV_NOPTS_VALUE) {
1899  if ((ret = ff_find_last_ts(s, stream_index, &ts_max, &pos_max, read_timestamp)) < 0)
1900  return ret;
1901  pos_limit = pos_max;
1902  }
1903 
1904  if (ts_max <= target_ts) {
1905  *ts_ret = ts_max;
1906  return pos_max;
1907  }
1908 
1909  if (ts_min > ts_max)
1910  return -1;
1911  else if (ts_min == ts_max)
1912  pos_limit = pos_min;
1913 
1914  no_change = 0;
1915  while (pos_min < pos_limit) {
1916  av_dlog(s,
1917  "pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%s dts_max=%s\n",
1918  pos_min, pos_max, av_ts2str(ts_min), av_ts2str(ts_max));
1919  assert(pos_limit <= pos_max);
1920 
1921  if (no_change == 0) {
1922  int64_t approximate_keyframe_distance = pos_max - pos_limit;
1923  // interpolate position (better than dichotomy)
1924  pos = av_rescale(target_ts - ts_min, pos_max - pos_min,
1925  ts_max - ts_min) +
1926  pos_min - approximate_keyframe_distance;
1927  } else if (no_change == 1) {
1928  // bisection if interpolation did not change min / max pos last time
1929  pos = (pos_min + pos_limit) >> 1;
1930  } else {
1931  /* linear search if bisection failed, can only happen if there
1932  * are very few or no keyframes between min/max */
1933  pos = pos_min;
1934  }
1935  if (pos <= pos_min)
1936  pos = pos_min + 1;
1937  else if (pos > pos_limit)
1938  pos = pos_limit;
1939  start_pos = pos;
1940 
1941  // May pass pos_limit instead of -1.
1942  ts = ff_read_timestamp(s, stream_index, &pos, INT64_MAX, read_timestamp);
1943  if (pos == pos_max)
1944  no_change++;
1945  else
1946  no_change = 0;
1947  av_dlog(s, "%"PRId64" %"PRId64" %"PRId64" / %s %s %s"
1948  " target:%s limit:%"PRId64" start:%"PRId64" noc:%d\n",
1949  pos_min, pos, pos_max,
1950  av_ts2str(ts_min), av_ts2str(ts), av_ts2str(ts_max), av_ts2str(target_ts),
1951  pos_limit, start_pos, no_change);
1952  if (ts == AV_NOPTS_VALUE) {
1953  av_log(s, AV_LOG_ERROR, "read_timestamp() failed in the middle\n");
1954  return -1;
1955  }
1956  if (target_ts <= ts) {
1957  pos_limit = start_pos - 1;
1958  pos_max = pos;
1959  ts_max = ts;
1960  }
1961  if (target_ts >= ts) {
1962  pos_min = pos;
1963  ts_min = ts;
1964  }
1965  }
1966 
1967  pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
1968  ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
1969 #if 0
1970  pos_min = pos;
1971  ts_min = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
1972  pos_min++;
1973  ts_max = ff_read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp);
1974  av_dlog(s, "pos=0x%"PRIx64" %s<=%s<=%s\n",
1975  pos, av_ts2str(ts_min), av_ts2str(target_ts), av_ts2str(ts_max));
1976 #endif
1977  *ts_ret = ts;
1978  return pos;
1979 }
1980 
1981 static int seek_frame_byte(AVFormatContext *s, int stream_index,
1982  int64_t pos, int flags)
1983 {
1984  int64_t pos_min, pos_max;
1985 
1986  pos_min = s->data_offset;
1987  pos_max = avio_size(s->pb) - 1;
1988 
1989  if (pos < pos_min)
1990  pos = pos_min;
1991  else if (pos > pos_max)
1992  pos = pos_max;
1993 
1994  avio_seek(s->pb, pos, SEEK_SET);
1995 
1996  s->io_repositioned = 1;
1997 
1998  return 0;
1999 }
2000 
2001 static int seek_frame_generic(AVFormatContext *s, int stream_index,
2002  int64_t timestamp, int flags)
2003 {
2004  int index;
2005  int64_t ret;
2006  AVStream *st;
2007  AVIndexEntry *ie;
2008 
2009  st = s->streams[stream_index];
2010 
2011  index = av_index_search_timestamp(st, timestamp, flags);
2012 
2013  if (index < 0 && st->nb_index_entries &&
2014  timestamp < st->index_entries[0].timestamp)
2015  return -1;
2016 
2017  if (index < 0 || index == st->nb_index_entries - 1) {
2018  AVPacket pkt;
2019  int nonkey = 0;
2020 
2021  if (st->nb_index_entries) {
2023  ie = &st->index_entries[st->nb_index_entries - 1];
2024  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2025  return ret;
2026  ff_update_cur_dts(s, st, ie->timestamp);
2027  } else {
2028  if ((ret = avio_seek(s->pb, s->data_offset, SEEK_SET)) < 0)
2029  return ret;
2030  }
2031  for (;;) {
2032  int read_status;
2033  do {
2034  read_status = av_read_frame(s, &pkt);
2035  } while (read_status == AVERROR(EAGAIN));
2036  if (read_status < 0)
2037  break;
2038  av_free_packet(&pkt);
2039  if (stream_index == pkt.stream_index && pkt.dts > timestamp) {
2040  if (pkt.flags & AV_PKT_FLAG_KEY)
2041  break;
2042  if (nonkey++ > 1000 && st->codec->codec_id != AV_CODEC_ID_CDGRAPHICS) {
2043  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);
2044  break;
2045  }
2046  }
2047  }
2048  index = av_index_search_timestamp(st, timestamp, flags);
2049  }
2050  if (index < 0)
2051  return -1;
2052 
2054  if (s->iformat->read_seek)
2055  if (s->iformat->read_seek(s, stream_index, timestamp, flags) >= 0)
2056  return 0;
2057  ie = &st->index_entries[index];
2058  if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
2059  return ret;
2060  ff_update_cur_dts(s, st, ie->timestamp);
2061 
2062  return 0;
2063 }
2064 
2065 static int seek_frame_internal(AVFormatContext *s, int stream_index,
2066  int64_t timestamp, int flags)
2067 {
2068  int ret;
2069  AVStream *st;
2070 
2071  if (flags & AVSEEK_FLAG_BYTE) {
2072  if (s->iformat->flags & AVFMT_NO_BYTE_SEEK)
2073  return -1;
2075  return seek_frame_byte(s, stream_index, timestamp, flags);
2076  }
2077 
2078  if (stream_index < 0) {
2079  stream_index = av_find_default_stream_index(s);
2080  if (stream_index < 0)
2081  return -1;
2082 
2083  st = s->streams[stream_index];
2084  /* timestamp for default must be expressed in AV_TIME_BASE units */
2085  timestamp = av_rescale(timestamp, st->time_base.den,
2086  AV_TIME_BASE * (int64_t) st->time_base.num);
2087  }
2088 
2089  /* first, we try the format specific seek */
2090  if (s->iformat->read_seek) {
2092  ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
2093  } else
2094  ret = -1;
2095  if (ret >= 0)
2096  return 0;
2097 
2098  if (s->iformat->read_timestamp &&
2099  !(s->iformat->flags & AVFMT_NOBINSEARCH)) {
2101  return ff_seek_frame_binary(s, stream_index, timestamp, flags);
2102  } else if (!(s->iformat->flags & AVFMT_NOGENSEARCH)) {
2104  return seek_frame_generic(s, stream_index, timestamp, flags);
2105  } else
2106  return -1;
2107 }
2108 
2109 int av_seek_frame(AVFormatContext *s, int stream_index,
2110  int64_t timestamp, int flags)
2111 {
2112  int ret;
2113 
2114  if (s->iformat->read_seek2 && !s->iformat->read_seek) {
2115  int64_t min_ts = INT64_MIN, max_ts = INT64_MAX;
2116  if ((flags & AVSEEK_FLAG_BACKWARD))
2117  max_ts = timestamp;
2118  else
2119  min_ts = timestamp;
2120  return avformat_seek_file(s, stream_index, min_ts, timestamp, max_ts,
2121  flags & ~AVSEEK_FLAG_BACKWARD);
2122  }
2123 
2124  ret = seek_frame_internal(s, stream_index, timestamp, flags);
2125 
2126  if (ret >= 0)
2128 
2129  return ret;
2130 }
2131 
2132 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
2133  int64_t ts, int64_t max_ts, int flags)
2134 {
2135  if (min_ts > ts || max_ts < ts)
2136  return -1;
2137  if (stream_index < -1 || stream_index >= (int)s->nb_streams)
2138  return AVERROR(EINVAL);
2139 
2140  if (s->seek2any>0)
2141  flags |= AVSEEK_FLAG_ANY;
2142  flags &= ~AVSEEK_FLAG_BACKWARD;
2143 
2144  if (s->iformat->read_seek2) {
2145  int ret;
2147 
2148  if (stream_index == -1 && s->nb_streams == 1) {
2149  AVRational time_base = s->streams[0]->time_base;
2150  ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
2151  min_ts = av_rescale_rnd(min_ts, time_base.den,
2152  time_base.num * (int64_t)AV_TIME_BASE,
2154  max_ts = av_rescale_rnd(max_ts, time_base.den,
2155  time_base.num * (int64_t)AV_TIME_BASE,
2157  }
2158 
2159  ret = s->iformat->read_seek2(s, stream_index, min_ts,
2160  ts, max_ts, flags);
2161 
2162  if (ret >= 0)
2164  return ret;
2165  }
2166 
2167  if (s->iformat->read_timestamp) {
2168  // try to seek via read_timestamp()
2169  }
2170 
2171  // Fall back on old API if new is not implemented but old is.
2172  // Note the old API has somewhat different semantics.
2173  if (s->iformat->read_seek || 1) {
2174  int dir = (ts - (uint64_t)min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);
2175  int ret = av_seek_frame(s, stream_index, ts, flags | dir);
2176  if (ret<0 && ts != min_ts && max_ts != ts) {
2177  ret = av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);
2178  if (ret >= 0)
2179  ret = av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));
2180  }
2181  return ret;
2182  }
2183 
2184  // try some generic seek like seek_frame_generic() but with new ts semantics
2185  return -1; //unreachable
2186 }
2187 
2188 /*******************************************************/
2189 
2190 /**
2191  * Return TRUE if the stream has accurate duration in any stream.
2192  *
2193  * @return TRUE if the stream has accurate duration for at least one component.
2194  */
2196 {
2197  int i;
2198  AVStream *st;
2199 
2200  for (i = 0; i < ic->nb_streams; i++) {
2201  st = ic->streams[i];
2202  if (st->duration != AV_NOPTS_VALUE)
2203  return 1;
2204  }
2205  if (ic->duration != AV_NOPTS_VALUE)
2206  return 1;
2207  return 0;
2208 }
2209 
2210 /**
2211  * Estimate the stream timings from the one of each components.
2212  *
2213  * Also computes the global bitrate if possible.
2214  */
2216 {
2217  int64_t start_time, start_time1, start_time_text, end_time, end_time1;
2218  int64_t duration, duration1, filesize;
2219  int i;
2220  AVStream *st;
2221  AVProgram *p;
2222 
2223  start_time = INT64_MAX;
2224  start_time_text = INT64_MAX;
2225  end_time = INT64_MIN;
2226  duration = INT64_MIN;
2227  for (i = 0; i < ic->nb_streams; i++) {
2228  st = ic->streams[i];
2229  if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
2230  start_time1 = av_rescale_q(st->start_time, st->time_base,
2231  AV_TIME_BASE_Q);
2233  if (start_time1 < start_time_text)
2234  start_time_text = start_time1;
2235  } else
2236  start_time = FFMIN(start_time, start_time1);
2237  end_time1 = AV_NOPTS_VALUE;
2238  if (st->duration != AV_NOPTS_VALUE) {
2239  end_time1 = start_time1 +
2240  av_rescale_q(st->duration, st->time_base,
2241  AV_TIME_BASE_Q);
2242  end_time = FFMAX(end_time, end_time1);
2243  }
2244  for (p = NULL; (p = av_find_program_from_stream(ic, p, i)); ) {
2245  if (p->start_time == AV_NOPTS_VALUE || p->start_time > start_time1)
2246  p->start_time = start_time1;
2247  if (p->end_time < end_time1)
2248  p->end_time = end_time1;
2249  }
2250  }
2251  if (st->duration != AV_NOPTS_VALUE) {
2252  duration1 = av_rescale_q(st->duration, st->time_base,
2253  AV_TIME_BASE_Q);
2254  duration = FFMAX(duration, duration1);
2255  }
2256  }
2257  if (start_time == INT64_MAX || (start_time > start_time_text && start_time - start_time_text < AV_TIME_BASE))
2258  start_time = start_time_text;
2259  else if (start_time > start_time_text)
2260  av_log(ic, AV_LOG_VERBOSE, "Ignoring outlier non primary stream starttime %f\n", start_time_text / (float)AV_TIME_BASE);
2261 
2262  if (start_time != INT64_MAX) {
2263  ic->start_time = start_time;
2264  if (end_time != INT64_MIN) {
2265  if (ic->nb_programs) {
2266  for (i = 0; i < ic->nb_programs; i++) {
2267  p = ic->programs[i];
2268  if (p->start_time != AV_NOPTS_VALUE && p->end_time > p->start_time)
2269  duration = FFMAX(duration, p->end_time - p->start_time);
2270  }
2271  } else
2272  duration = FFMAX(duration, end_time - start_time);
2273  }
2274  }
2275  if (duration != INT64_MIN && duration > 0 && ic->duration == AV_NOPTS_VALUE) {
2276  ic->duration = duration;
2277  }
2278  if (ic->pb && (filesize = avio_size(ic->pb)) > 0 && ic->duration != AV_NOPTS_VALUE) {
2279  /* compute the bitrate */
2280  double bitrate = (double) filesize * 8.0 * AV_TIME_BASE /
2281  (double) ic->duration;
2282  if (bitrate >= 0 && bitrate <= INT_MAX)
2283  ic->bit_rate = bitrate;
2284  }
2285 }
2286 
2288 {
2289  int i;
2290  AVStream *st;
2291 
2293  for (i = 0; i < ic->nb_streams; i++) {
2294  st = ic->streams[i];
2295  if (st->start_time == AV_NOPTS_VALUE) {
2296  if (ic->start_time != AV_NOPTS_VALUE)
2298  st->time_base);
2299  if (ic->duration != AV_NOPTS_VALUE)
2301  st->time_base);
2302  }
2303  }
2304 }
2305 
2307 {
2308  int64_t filesize, duration;
2309  int i, show_warning = 0;
2310  AVStream *st;
2311 
2312  /* if bit_rate is already set, we believe it */
2313  if (ic->bit_rate <= 0) {
2314  int bit_rate = 0;
2315  for (i = 0; i < ic->nb_streams; i++) {
2316  st = ic->streams[i];
2317  if (st->codec->bit_rate > 0) {
2318  if (INT_MAX - st->codec->bit_rate < bit_rate) {
2319  bit_rate = 0;
2320  break;
2321  }
2322  bit_rate += st->codec->bit_rate;
2323  }
2324  }
2325  ic->bit_rate = bit_rate;
2326  }
2327 
2328  /* if duration is already set, we believe it */
2329  if (ic->duration == AV_NOPTS_VALUE &&
2330  ic->bit_rate != 0) {
2331  filesize = ic->pb ? avio_size(ic->pb) : 0;
2332  if (filesize > ic->data_offset) {
2333  filesize -= ic->data_offset;
2334  for (i = 0; i < ic->nb_streams; i++) {
2335  st = ic->streams[i];
2336  if ( st->time_base.num <= INT64_MAX / ic->bit_rate
2337  && st->duration == AV_NOPTS_VALUE) {
2338  duration = av_rescale(8 * filesize, st->time_base.den,
2339  ic->bit_rate *
2340  (int64_t) st->time_base.num);
2341  st->duration = duration;
2342  show_warning = 1;
2343  }
2344  }
2345  }
2346  }
2347  if (show_warning)
2348  av_log(ic, AV_LOG_WARNING,
2349  "Estimating duration from bitrate, this may be inaccurate\n");
2350 }
2351 
2352 #define DURATION_MAX_READ_SIZE 250000LL
2353 #define DURATION_MAX_RETRY 4
2354 
2355 /* only usable for MPEG-PS streams */
2356 static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
2357 {
2358  AVPacket pkt1, *pkt = &pkt1;
2359  AVStream *st;
2360  int num, den, read_size, i, ret;
2361  int found_duration = 0;
2362  int is_end;
2363  int64_t filesize, offset, duration;
2364  int retry = 0;
2365 
2366  /* flush packet queue */
2367  flush_packet_queue(ic);
2368 
2369  for (i = 0; i < ic->nb_streams; i++) {
2370  st = ic->streams[i];
2371  if (st->start_time == AV_NOPTS_VALUE &&
2372  st->first_dts == AV_NOPTS_VALUE &&
2375  "start time for stream %d is not set in estimate_timings_from_pts\n", i);
2376 
2377  if (st->parser) {
2378  av_parser_close(st->parser);
2379  st->parser = NULL;
2380  }
2381  }
2382 
2383  av_opt_set(ic, "skip_changes", "1", AV_OPT_SEARCH_CHILDREN);
2384  /* estimate the end time (duration) */
2385  /* XXX: may need to support wrapping */
2386  filesize = ic->pb ? avio_size(ic->pb) : 0;
2387  do {
2388  is_end = found_duration;
2389  offset = filesize - (DURATION_MAX_READ_SIZE << retry);
2390  if (offset < 0)
2391  offset = 0;
2392 
2393  avio_seek(ic->pb, offset, SEEK_SET);
2394  read_size = 0;
2395  for (;;) {
2396  if (read_size >= DURATION_MAX_READ_SIZE << (FFMAX(retry - 1, 0)))
2397  break;
2398 
2399  do {
2400  ret = ff_read_packet(ic, pkt);
2401  } while (ret == AVERROR(EAGAIN));
2402  if (ret != 0)
2403  break;
2404  read_size += pkt->size;
2405  st = ic->streams[pkt->stream_index];
2406  if (pkt->pts != AV_NOPTS_VALUE &&
2407  (st->start_time != AV_NOPTS_VALUE ||
2408  st->first_dts != AV_NOPTS_VALUE)) {
2409  if (pkt->duration == 0) {
2410  ff_compute_frame_duration(ic, &num, &den, st, st->parser, pkt);
2411  if (den && num) {
2412  pkt->duration = av_rescale_rnd(1,
2413  num * (int64_t) st->time_base.den,
2414  den * (int64_t) st->time_base.num,
2415  AV_ROUND_DOWN);
2416  }
2417  }
2418  duration = pkt->pts + pkt->duration;
2419  found_duration = 1;
2420  if (st->start_time != AV_NOPTS_VALUE)
2421  duration -= st->start_time;
2422  else
2423  duration -= st->first_dts;
2424  if (duration > 0) {
2425  if (st->duration == AV_NOPTS_VALUE || st->info->last_duration<= 0 ||
2426  (st->duration < duration && FFABS(duration - st->info->last_duration) < 60LL*st->time_base.den / st->time_base.num))
2427  st->duration = duration;
2428  st->info->last_duration = duration;
2429  }
2430  }
2431  av_free_packet(pkt);
2432  }
2433 
2434  /* check if all audio/video streams have valid duration */
2435  if (!is_end) {
2436  is_end = 1;
2437  for (i = 0; i < ic->nb_streams; i++) {
2438  st = ic->streams[i];
2439  switch (st->codec->codec_type) {
2440  case AVMEDIA_TYPE_VIDEO:
2441  case AVMEDIA_TYPE_AUDIO:
2442  if (st->duration == AV_NOPTS_VALUE)
2443  is_end = 0;
2444  }
2445  }
2446  }
2447  } while (!is_end &&
2448  offset &&
2449  ++retry <= DURATION_MAX_RETRY);
2450 
2451  av_opt_set(ic, "skip_changes", "0", AV_OPT_SEARCH_CHILDREN);
2452 
2453  /* warn about audio/video streams which duration could not be estimated */
2454  for (i = 0; i < ic->nb_streams; i++) {
2455  st = ic->streams[i];
2456  if (st->duration == AV_NOPTS_VALUE) {
2457  switch (st->codec->codec_type) {
2458  case AVMEDIA_TYPE_VIDEO:
2459  case AVMEDIA_TYPE_AUDIO:
2460  if (st->start_time != AV_NOPTS_VALUE || st->first_dts != AV_NOPTS_VALUE) {
2461  av_log(ic, AV_LOG_DEBUG, "stream %d : no PTS found at end of file, duration not set\n", i);
2462  } else
2463  av_log(ic, AV_LOG_DEBUG, "stream %d : no TS found at start of file, duration not set\n", i);
2464  }
2465  }
2466  }
2468 
2469  avio_seek(ic->pb, old_offset, SEEK_SET);
2470  for (i = 0; i < ic->nb_streams; i++) {
2471  int j;
2472 
2473  st = ic->streams[i];
2474  st->cur_dts = st->first_dts;
2477  for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
2478  st->pts_buffer[j] = AV_NOPTS_VALUE;
2479  }
2480 }
2481 
2482 static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
2483 {
2484  int64_t file_size;
2485 
2486  /* get the file size, if possible */
2487  if (ic->iformat->flags & AVFMT_NOFILE) {
2488  file_size = 0;
2489  } else {
2490  file_size = avio_size(ic->pb);
2491  file_size = FFMAX(0, file_size);
2492  }
2493 
2494  if ((!strcmp(ic->iformat->name, "mpeg") ||
2495  !strcmp(ic->iformat->name, "mpegts")) &&
2496  file_size && ic->pb->seekable) {
2497  /* get accurate estimate from the PTSes */
2498  estimate_timings_from_pts(ic, old_offset);
2500  } else if (has_duration(ic)) {
2501  /* at least one component has timings - we use them for all
2502  * the components */
2505  } else {
2506  /* less precise: use bitrate info */
2509  }
2511 
2512  {
2513  int i;
2514  AVStream av_unused *st;
2515  for (i = 0; i < ic->nb_streams; i++) {
2516  st = ic->streams[i];
2517  av_dlog(ic, "%d: start_time: %0.3f duration: %0.3f\n", i,
2518  (double) st->start_time / AV_TIME_BASE,
2519  (double) st->duration / AV_TIME_BASE);
2520  }
2521  av_dlog(ic,
2522  "stream: start_time: %0.3f duration: %0.3f bitrate=%d kb/s\n",
2523  (double) ic->start_time / AV_TIME_BASE,
2524  (double) ic->duration / AV_TIME_BASE,
2525  ic->bit_rate / 1000);
2526  }
2527 }
2528 
2529 static int has_codec_parameters(AVStream *st, const char **errmsg_ptr)
2530 {
2531  AVCodecContext *avctx = st->codec;
2532 
2533 #define FAIL(errmsg) do { \
2534  if (errmsg_ptr) \
2535  *errmsg_ptr = errmsg; \
2536  return 0; \
2537  } while (0)
2538 
2539  if ( avctx->codec_id == AV_CODEC_ID_NONE
2540  && avctx->codec_type != AVMEDIA_TYPE_DATA)
2541  FAIL("unknown codec");
2542  switch (avctx->codec_type) {
2543  case AVMEDIA_TYPE_AUDIO:
2544  if (!avctx->frame_size && determinable_frame_size(avctx))
2545  FAIL("unspecified frame size");
2546  if (st->info->found_decoder >= 0 &&
2547  avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
2548  FAIL("unspecified sample format");
2549  if (!avctx->sample_rate)
2550  FAIL("unspecified sample rate");
2551  if (!avctx->channels)
2552  FAIL("unspecified number of channels");
2553  if (st->info->found_decoder >= 0 && !st->nb_decoded_frames && avctx->codec_id == AV_CODEC_ID_DTS)
2554  FAIL("no decodable DTS frames");
2555  break;
2556  case AVMEDIA_TYPE_VIDEO:
2557  if (!avctx->width)
2558  FAIL("unspecified size");
2559  if (st->info->found_decoder >= 0 && avctx->pix_fmt == AV_PIX_FMT_NONE)
2560  FAIL("unspecified pixel format");
2563  FAIL("no frame in rv30/40 and no sar");
2564  break;
2565  case AVMEDIA_TYPE_SUBTITLE:
2566  if (avctx->codec_id == AV_CODEC_ID_HDMV_PGS_SUBTITLE && !avctx->width)
2567  FAIL("unspecified size");
2568  break;
2569  case AVMEDIA_TYPE_DATA:
2570  if (avctx->codec_id == AV_CODEC_ID_NONE) return 1;
2571  }
2572 
2573  return 1;
2574 }
2575 
2576 /* returns 1 or 0 if or if not decoded data was returned, or a negative error */
2579 {
2580  const AVCodec *codec;
2581  int got_picture = 1, ret = 0;
2583  AVSubtitle subtitle;
2584  AVPacket pkt = *avpkt;
2585 
2586  if (!frame)
2587  return AVERROR(ENOMEM);
2588 
2589  if (!avcodec_is_open(st->codec) &&
2590  st->info->found_decoder <= 0 &&
2591  (st->codec->codec_id != -st->info->found_decoder || !st->codec->codec_id)) {
2592  AVDictionary *thread_opt = NULL;
2593 
2594  codec = find_decoder(s, st, st->codec->codec_id);
2595 
2596  if (!codec) {
2597  st->info->found_decoder = -st->codec->codec_id;
2598  ret = -1;
2599  goto fail;
2600  }
2601 
2602  /* Force thread count to 1 since the H.264 decoder will not extract
2603  * SPS and PPS to extradata during multi-threaded decoding. */
2604  av_dict_set(options ? options : &thread_opt, "threads", "1", 0);
2605  if (s->codec_whitelist)
2606  av_dict_set(options ? options : &thread_opt, "codec_whitelist", s->codec_whitelist, 0);
2607  ret = avcodec_open2(st->codec, codec, options ? options : &thread_opt);
2608  if (!options)
2609  av_dict_free(&thread_opt);
2610  if (ret < 0) {
2611  st->info->found_decoder = -st->codec->codec_id;
2612  goto fail;
2613  }
2614  st->info->found_decoder = 1;
2615  } else if (!st->info->found_decoder)
2616  st->info->found_decoder = 1;
2617 
2618  if (st->info->found_decoder < 0) {
2619  ret = -1;
2620  goto fail;
2621  }
2622 
2623  while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
2624  ret >= 0 &&
2626  (!st->codec_info_nb_frames &&
2628  got_picture = 0;
2629  switch (st->codec->codec_type) {
2630  case AVMEDIA_TYPE_VIDEO:
2631  ret = avcodec_decode_video2(st->codec, frame,
2632  &got_picture, &pkt);
2633  break;
2634  case AVMEDIA_TYPE_AUDIO:
2635  ret = avcodec_decode_audio4(st->codec, frame, &got_picture, &pkt);
2636  break;
2637  case AVMEDIA_TYPE_SUBTITLE:
2638  ret = avcodec_decode_subtitle2(st->codec, &subtitle,
2639  &got_picture, &pkt);
2640  ret = pkt.size;
2641  break;
2642  default:
2643  break;
2644  }
2645  if (ret >= 0) {
2646  if (got_picture)
2647  st->nb_decoded_frames++;
2648  pkt.data += ret;
2649  pkt.size -= ret;
2650  ret = got_picture;
2651  }
2652  }
2653 
2654  if (!pkt.data && !got_picture)
2655  ret = -1;
2656 
2657 fail:
2658  av_frame_free(&frame);
2659  return ret;
2660 }
2661 
2662 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
2663 {
2664  while (tags->id != AV_CODEC_ID_NONE) {
2665  if (tags->id == id)
2666  return tags->tag;
2667  tags++;
2668  }
2669  return 0;
2670 }
2671 
2672 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
2673 {
2674  int i;
2675  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
2676  if (tag == tags[i].tag)
2677  return tags[i].id;
2678  for (i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
2679  if (avpriv_toupper4(tag) == avpriv_toupper4(tags[i].tag))
2680  return tags[i].id;
2681  return AV_CODEC_ID_NONE;
2682 }
2683 
2684 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
2685 {
2686  if (flt) {
2687  switch (bps) {
2688  case 32:
2690  case 64:
2692  default:
2693  return AV_CODEC_ID_NONE;
2694  }
2695  } else {
2696  bps += 7;
2697  bps >>= 3;
2698  if (sflags & (1 << (bps - 1))) {
2699  switch (bps) {
2700  case 1:
2701  return AV_CODEC_ID_PCM_S8;
2702  case 2:
2704  case 3:
2706  case 4:
2708  default:
2709  return AV_CODEC_ID_NONE;
2710  }
2711  } else {
2712  switch (bps) {
2713  case 1:
2714  return AV_CODEC_ID_PCM_U8;
2715  case 2:
2717  case 3:
2719  case 4:
2721  default:
2722  return AV_CODEC_ID_NONE;
2723  }
2724  }
2725  }
2726 }
2727 
2728 unsigned int av_codec_get_tag(const AVCodecTag *const *tags, enum AVCodecID id)
2729 {
2730  unsigned int tag;
2731  if (!av_codec_get_tag2(tags, id, &tag))
2732  return 0;
2733  return tag;
2734 }
2735 
2736 int av_codec_get_tag2(const AVCodecTag * const *tags, enum AVCodecID id,
2737  unsigned int *tag)
2738 {
2739  int i;
2740  for (i = 0; tags && tags[i]; i++) {
2741  const AVCodecTag *codec_tags = tags[i];
2742  while (codec_tags->id != AV_CODEC_ID_NONE) {
2743  if (codec_tags->id == id) {
2744  *tag = codec_tags->tag;
2745  return 1;
2746  }
2747  codec_tags++;
2748  }
2749  }
2750  return 0;
2751 }
2752 
2753 enum AVCodecID av_codec_get_id(const AVCodecTag *const *tags, unsigned int tag)
2754 {
2755  int i;
2756  for (i = 0; tags && tags[i]; i++) {
2757  enum AVCodecID id = ff_codec_get_id(tags[i], tag);
2758  if (id != AV_CODEC_ID_NONE)
2759  return id;
2760  }
2761  return AV_CODEC_ID_NONE;
2762 }
2763 
2765 {
2766  unsigned int i, j;
2767  int64_t max_time = s->duration +
2768  ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
2769 
2770  for (i = 0; i < s->nb_chapters; i++)
2771  if (s->chapters[i]->end == AV_NOPTS_VALUE) {
2772  AVChapter *ch = s->chapters[i];
2773  int64_t end = max_time ? av_rescale_q(max_time, AV_TIME_BASE_Q,
2774  ch->time_base)
2775  : INT64_MAX;
2776 
2777  for (j = 0; j < s->nb_chapters; j++) {
2778  AVChapter *ch1 = s->chapters[j];
2779  int64_t next_start = av_rescale_q(ch1->start, ch1->time_base,
2780  ch->time_base);
2781  if (j != i && next_start > ch->start && next_start < end)
2782  end = next_start;
2783  }
2784  ch->end = (end == INT64_MAX) ? ch->start : end;
2785  }
2786 }
2787 
2788 static int get_std_framerate(int i)
2789 {
2790  if (i < 30*12)
2791  return (i + 1) * 1001;
2792  i -= 30*12;
2793 
2794  if (i < 7)
2795  return ((const int[]) { 40, 48, 50, 60, 80, 120, 240})[i] * 1001 * 12;
2796 
2797  i -= 7;
2798 
2799  return ((const int[]) { 24, 30, 60, 12, 15, 48 })[i] * 1000 * 12;
2800 }
2801 
2802 /* Is the time base unreliable?
2803  * This is a heuristic to balance between quick acceptance of the values in
2804  * the headers vs. some extra checks.
2805  * Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
2806  * MPEG-2 commonly misuses field repeat flags to store different framerates.
2807  * And there are "variable" fps files this needs to detect as well. */
2809 {
2810  if (c->time_base.den >= 101L * c->time_base.num ||
2811  c->time_base.den < 5L * c->time_base.num ||
2812  // c->codec_tag == AV_RL32("DIVX") ||
2813  // c->codec_tag == AV_RL32("XVID") ||
2814  c->codec_tag == AV_RL32("mp4v") ||
2816  c->codec_id == AV_CODEC_ID_GIF ||
2817  c->codec_id == AV_CODEC_ID_H264)
2818  return 1;
2819  return 0;
2820 }
2821 
2823 {
2824  int ret;
2825 
2827  avctx->extradata_size = 0;
2828  return AVERROR(EINVAL);
2829  }
2831  if (avctx->extradata) {
2832  memset(avctx->extradata + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2833  avctx->extradata_size = size;
2834  ret = 0;
2835  } else {
2836  avctx->extradata_size = 0;
2837  ret = AVERROR(ENOMEM);
2838  }
2839  return ret;
2840 }
2841 
2843 {
2844  int ret = ff_alloc_extradata(avctx, size);
2845  if (ret < 0)
2846  return ret;
2847  ret = avio_read(pb, avctx->extradata, size);
2848  if (ret != size) {
2849  av_freep(&avctx->extradata);
2850  avctx->extradata_size = 0;
2851  av_log(avctx, AV_LOG_ERROR, "Failed to read extradata of size %d\n", size);
2852  return ret < 0 ? ret : AVERROR_INVALIDDATA;
2853  }
2854 
2855  return ret;
2856 }
2857 
2858 int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
2859 {
2860  int i, j;
2861  int64_t last = st->info->last_dts;
2862 
2863  if ( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
2864  && ts - (uint64_t)last < INT64_MAX) {
2865  double dts = (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
2866  int64_t duration = ts - last;
2867 
2868  if (!st->info->duration_error)
2869  st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
2870  if (!st->info->duration_error)
2871  return AVERROR(ENOMEM);
2872 
2873 // if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
2874 // av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
2875  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
2876  if (st->info->duration_error[0][1][i] < 1e10) {
2877  int framerate = get_std_framerate(i);
2878  double sdts = dts*framerate/(1001*12);
2879  for (j= 0; j<2; j++) {
2880  int64_t ticks = llrint(sdts+j*0.5);
2881  double error= sdts - ticks + j*0.5;
2882  st->info->duration_error[j][0][i] += error;
2883  st->info->duration_error[j][1][i] += error*error;
2884  }
2885  }
2886  }
2887  st->info->duration_count++;
2889 
2890  if (st->info->duration_count % 10 == 0) {
2891  int n = st->info->duration_count;
2892  for (i = 0; i<MAX_STD_TIMEBASES; i++) {
2893  if (st->info->duration_error[0][1][i] < 1e10) {
2894  double a0 = st->info->duration_error[0][0][i] / n;
2895  double error0 = st->info->duration_error[0][1][i] / n - a0*a0;
2896  double a1 = st->info->duration_error[1][0][i] / n;
2897  double error1 = st->info->duration_error[1][1][i] / n - a1*a1;
2898  if (error0 > 0.04 && error1 > 0.04) {
2899  st->info->duration_error[0][1][i] = 2e10;
2900  st->info->duration_error[1][1][i] = 2e10;
2901  }
2902  }
2903  }
2904  }
2905 
2906  // ignore the first 4 values, they might have some random jitter
2907  if (st->info->duration_count > 3 && is_relative(ts) == is_relative(last))
2908  st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
2909  }
2910  if (ts != AV_NOPTS_VALUE)
2911  st->info->last_dts = ts;
2912 
2913  return 0;
2914 }
2915 
2917 {
2918  int i, j;
2919 
2920  for (i = 0; i < ic->nb_streams; i++) {
2921  AVStream *st = ic->streams[i];
2922 
2923  if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO)
2924  continue;
2925  // the check for tb_unreliable() is not completely correct, since this is not about handling
2926  // a unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
2927  // ipmovie.c produces.
2928  if (tb_unreliable(st->codec) && 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)
2929  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);
2930  if (st->info->duration_count>1 && !st->r_frame_rate.num
2931  && tb_unreliable(st->codec)) {
2932  int num = 0;
2933  double best_error= 0.01;
2934  AVRational ref_rate = st->r_frame_rate.num ? st->r_frame_rate : av_inv_q(st->time_base);
2935 
2936  for (j= 0; j<MAX_STD_TIMEBASES; j++) {
2937  int k;
2938 
2939  if (st->info->codec_info_duration && st->info->codec_info_duration*av_q2d(st->time_base) < (1001*12.0)/get_std_framerate(j))
2940  continue;
2941  if (!st->info->codec_info_duration && 1.0 < (1001*12.0)/get_std_framerate(j))
2942  continue;
2943 
2944  if (av_q2d(st->time_base) * st->info->rfps_duration_sum / st->info->duration_count < (1001*12.0 * 0.8)/get_std_framerate(j))
2945  continue;
2946 
2947  for (k= 0; k<2; k++) {
2948  int n = st->info->duration_count;
2949  double a= st->info->duration_error[k][0][j] / n;
2950  double error= st->info->duration_error[k][1][j]/n - a*a;
2951 
2952  if (error < best_error && best_error> 0.000000001) {
2953  best_error= error;
2954  num = get_std_framerate(j);
2955  }
2956  if (error < 0.02)
2957  av_log(NULL, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
2958  }
2959  }
2960  // do not increase frame rate by more than 1 % in order to match a standard rate.
2961  if (num && (!ref_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(ref_rate)))
2962  av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
2963  }
2964  if ( !st->avg_frame_rate.num
2965  && st->r_frame_rate.num && st->info->rfps_duration_sum
2966  && st->info->codec_info_duration <= 0
2967  && st->info->duration_count > 2
2968  && 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
2969  ) {
2970  av_log(ic, AV_LOG_DEBUG, "Setting avg frame rate based on r frame rate\n");
2971  st->avg_frame_rate = st->r_frame_rate;
2972  }
2973 
2974  av_freep(&st->info->duration_error);
2975  st->info->last_dts = AV_NOPTS_VALUE;
2976  st->info->duration_count = 0;
2977  st->info->rfps_duration_sum = 0;
2978  }
2979 }
2980 
2982 {
2983  int i, count, ret = 0, j;
2984  int64_t read_size;
2985  AVStream *st;
2986  AVPacket pkt1, *pkt;
2987  int64_t old_offset = avio_tell(ic->pb);
2988  // new streams might appear, no options for those
2989  int orig_nb_streams = ic->nb_streams;
2990  int flush_codecs;
2991  int64_t max_analyze_duration = ic->max_analyze_duration2;
2992  int64_t probesize = ic->probesize2;
2993 
2994  if (!max_analyze_duration)
2995  max_analyze_duration = ic->max_analyze_duration;
2996  if (ic->probesize)
2997  probesize = ic->probesize;
2998  flush_codecs = probesize > 0;
2999 
3000  av_opt_set(ic, "skip_clear", "1", AV_OPT_SEARCH_CHILDREN);
3001 
3002  if (!max_analyze_duration) {
3003  if (!strcmp(ic->iformat->name, "flv") && !(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
3004  max_analyze_duration = 10*AV_TIME_BASE;
3005  } else
3006  max_analyze_duration = 5*AV_TIME_BASE;
3007  }
3008 
3009  if (ic->pb)
3010  av_log(ic, AV_LOG_DEBUG, "Before avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d\n",
3011  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count);
3012 
3013  for (i = 0; i < ic->nb_streams; i++) {
3014  const AVCodec *codec;
3015  AVDictionary *thread_opt = NULL;
3016  st = ic->streams[i];
3017 
3018  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO ||
3020 /* if (!st->time_base.num)
3021  st->time_base = */
3022  if (!st->codec->time_base.num)
3023  st->codec->time_base = st->time_base;
3024  }
3025  // only for the split stuff
3026  if (!st->parser && !(ic->flags & AVFMT_FLAG_NOPARSE)) {
3027  st->parser = av_parser_init(st->codec->codec_id);
3028  if (st->parser) {
3029  if (st->need_parsing == AVSTREAM_PARSE_HEADERS) {
3031  } else if (st->need_parsing == AVSTREAM_PARSE_FULL_RAW) {
3033  }
3034  } else if (st->need_parsing) {
3035  av_log(ic, AV_LOG_VERBOSE, "parser not found for codec "
3036  "%s, packets or times may be invalid.\n",
3038  }
3039  }
3040  codec = find_decoder(ic, st, st->codec->codec_id);
3041 
3042  /* Force thread count to 1 since the H.264 decoder will not extract
3043  * SPS and PPS to extradata during multi-threaded decoding. */
3044  av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
3045 
3046  if (ic->codec_whitelist)
3047  av_dict_set(options ? &options[i] : &thread_opt, "codec_whitelist", ic->codec_whitelist, 0);
3048 
3049  /* Ensure that subtitle_header is properly set. */
3051  && codec && !st->codec->codec) {
3052  if (avcodec_open2(st->codec, codec, options ? &options[i] : &thread_opt) < 0)
3053  av_log(ic, AV_LOG_WARNING,
3054  "Failed to open codec in av_find_stream_info\n");
3055  }
3056 
3057  // Try to just open decoders, in case this is enough to get parameters.
3058  if (!has_codec_parameters(st, NULL) && st->request_probe <= 0) {
3059  if (codec && !st->codec->codec)
3060  if (avcodec_open2(st->codec, codec, options ? &options[i] : &thread_opt) < 0)
3061  av_log(ic, AV_LOG_WARNING,
3062  "Failed to open codec in av_find_stream_info\n");
3063  }
3064  if (!options)
3065  av_dict_free(&thread_opt);
3066  }
3067 
3068  for (i = 0; i < ic->nb_streams; i++) {
3069 #if FF_API_R_FRAME_RATE
3070  ic->streams[i]->info->last_dts = AV_NOPTS_VALUE;
3071 #endif
3074  }
3075 
3076  count = 0;
3077  read_size = 0;
3078  for (;;) {
3080  ret = AVERROR_EXIT;
3081  av_log(ic, AV_LOG_DEBUG, "interrupted\n");
3082  break;
3083  }
3084 
3085  /* check if one codec still needs to be handled */
3086  for (i = 0; i < ic->nb_streams; i++) {
3087  int fps_analyze_framecount = 20;
3088 
3089  st = ic->streams[i];
3090  if (!has_codec_parameters(st, NULL))
3091  break;
3092  /* If the timebase is coarse (like the usual millisecond precision
3093  * of mkv), we need to analyze more frames to reliably arrive at
3094  * the correct fps. */
3095  if (av_q2d(st->time_base) > 0.0005)
3096  fps_analyze_framecount *= 2;
3097  if (!tb_unreliable(st->codec))
3098  fps_analyze_framecount = 0;
3099  if (ic->fps_probe_size >= 0)
3100  fps_analyze_framecount = ic->fps_probe_size;
3102  fps_analyze_framecount = 0;
3103  /* variable fps and no guess at the real fps */
3104  if (!(st->r_frame_rate.num && st->avg_frame_rate.num) &&
3105  st->info->duration_count < fps_analyze_framecount &&
3107  break;
3108  if (st->parser && st->parser->parser->split &&
3109  !st->codec->extradata)
3110  break;
3111  if (st->first_dts == AV_NOPTS_VALUE &&
3112  !(ic->iformat->flags & AVFMT_NOTIMESTAMPS) &&
3113  st->codec_info_nb_frames < ic->max_ts_probe &&
3114  (st->codec->codec_type == AVMEDIA_TYPE_VIDEO ||
3116  break;
3117  }
3118  if (i == ic->nb_streams) {
3119  /* NOTE: If the format has no header, then we need to read some
3120  * packets to get most of the streams, so we cannot stop here. */
3121  if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
3122  /* If we found the info for all the codecs, we can stop. */
3123  ret = count;
3124  av_log(ic, AV_LOG_DEBUG, "All info found\n");
3125  flush_codecs = 0;
3126  break;
3127  }
3128  }
3129  /* We did not get all the codec info, but we read too much data. */
3130  if (read_size >= probesize) {
3131  ret = count;
3132  av_log(ic, AV_LOG_DEBUG,
3133  "Probe buffer size limit of %"PRId64" bytes reached\n", probesize);
3134  for (i = 0; i < ic->nb_streams; i++)
3135  if (!ic->streams[i]->r_frame_rate.num &&
3136  ic->streams[i]->info->duration_count <= 1 &&
3138  strcmp(ic->iformat->name, "image2"))
3139  av_log(ic, AV_LOG_WARNING,
3140  "Stream #%d: not enough frames to estimate rate; "
3141  "consider increasing probesize\n", i);
3142  break;
3143  }
3144 
3145  /* NOTE: A new stream can be added there if no header in file
3146  * (AVFMTCTX_NOHEADER). */
3147  ret = read_frame_internal(ic, &pkt1);
3148  if (ret == AVERROR(EAGAIN))
3149  continue;
3150 
3151  if (ret < 0) {
3152  /* EOF or error*/
3153  break;
3154  }
3155 
3156  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3158  {
3159  pkt = add_to_pktbuf(&ic->packet_buffer, &pkt1,
3160  &ic->packet_buffer_end);
3161  if (!pkt) {
3162  ret = AVERROR(ENOMEM);
3163  goto find_stream_info_err;
3164  }
3165  if ((ret = av_dup_packet(pkt)) < 0)
3166  goto find_stream_info_err;
3167  }
3168 
3169  st = ic->streams[pkt->stream_index];
3171  read_size += pkt->size;
3172 
3173  if (pkt->dts != AV_NOPTS_VALUE && st->codec_info_nb_frames > 1) {
3174  /* check for non-increasing dts */
3175  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3176  st->info->fps_last_dts >= pkt->dts) {
3177  av_log(ic, AV_LOG_DEBUG,
3178  "Non-increasing DTS in stream %d: packet %d with DTS "
3179  "%"PRId64", packet %d with DTS %"PRId64"\n",
3180  st->index, st->info->fps_last_dts_idx,
3182  pkt->dts);
3183  st->info->fps_first_dts =
3185  }
3186  /* Check for a discontinuity in dts. If the difference in dts
3187  * is more than 1000 times the average packet duration in the
3188  * sequence, we treat it as a discontinuity. */
3189  if (st->info->fps_last_dts != AV_NOPTS_VALUE &&
3191  (pkt->dts - st->info->fps_last_dts) / 1000 >
3192  (st->info->fps_last_dts - st->info->fps_first_dts) /
3193  (st->info->fps_last_dts_idx - st->info->fps_first_dts_idx)) {
3194  av_log(ic, AV_LOG_WARNING,
3195  "DTS discontinuity in stream %d: packet %d with DTS "
3196  "%"PRId64", packet %d with DTS %"PRId64"\n",
3197  st->index, st->info->fps_last_dts_idx,
3199  pkt->dts);
3200  st->info->fps_first_dts =
3202  }
3203 
3204  /* update stored dts values */
3205  if (st->info->fps_first_dts == AV_NOPTS_VALUE) {
3206  st->info->fps_first_dts = pkt->dts;
3208  }
3209  st->info->fps_last_dts = pkt->dts;
3211  }
3212  if (st->codec_info_nb_frames>1) {
3213  int64_t t = 0;
3214 
3215  if (st->time_base.den > 0)
3217  if (st->avg_frame_rate.num > 0)
3219 
3220  if ( t == 0
3221  && st->codec_info_nb_frames>30
3222  && st->info->fps_first_dts != AV_NOPTS_VALUE
3223  && st->info->fps_last_dts != AV_NOPTS_VALUE)
3225 
3226  if (t >= max_analyze_duration) {
3227  av_log(ic, AV_LOG_VERBOSE, "max_analyze_duration %"PRId64" reached at %"PRId64" microseconds\n",
3228  max_analyze_duration,
3229  t);
3230  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3231  av_packet_unref(pkt);
3232  break;
3233  }
3234  if (pkt->duration) {
3235  st->info->codec_info_duration += pkt->duration;
3236  st->info->codec_info_duration_fields += st->parser && st->need_parsing && st->codec->ticks_per_frame ==2 ? st->parser->repeat_pict + 1 : 2;
3237  }
3238  }
3239 #if FF_API_R_FRAME_RATE
3240  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
3241  ff_rfps_add_frame(ic, st, pkt->dts);
3242 #endif
3243  if (st->parser && st->parser->parser->split && !st->codec->extradata) {
3244  int i = st->parser->parser->split(st->codec, pkt->data, pkt->size);
3245  if (i > 0 && i < FF_MAX_EXTRADATA_SIZE) {
3246  if (ff_alloc_extradata(st->codec, i))
3247  return AVERROR(ENOMEM);
3248  memcpy(st->codec->extradata, pkt->data,
3249  st->codec->extradata_size);
3250  }
3251  }
3252 
3253  /* If still no information, we try to open the codec and to
3254  * decompress the frame. We try to avoid that in most cases as
3255  * it takes longer and uses more memory. For MPEG-4, we need to
3256  * decompress for QuickTime.
3257  *
3258  * If CODEC_CAP_CHANNEL_CONF is set this will force decoding of at
3259  * least one frame of codec data, this makes sure the codec initializes
3260  * the channel configuration and does not only trust the values from
3261  * the container. */
3262  try_decode_frame(ic, st, pkt,
3263  (options && i < orig_nb_streams) ? &options[i] : NULL);
3264 
3265  if (ic->flags & AVFMT_FLAG_NOBUFFER)
3266  av_packet_unref(pkt);
3267 
3268  st->codec_info_nb_frames++;
3269  count++;
3270  }
3271 
3272  if (flush_codecs) {
3273  AVPacket empty_pkt = { 0 };
3274  int err = 0;
3275  av_init_packet(&empty_pkt);
3276 
3277  for (i = 0; i < ic->nb_streams; i++) {
3278 
3279  st = ic->streams[i];
3280 
3281  /* flush the decoders */
3282  if (st->info->found_decoder == 1) {
3283  do {
3284  err = try_decode_frame(ic, st, &empty_pkt,
3285  (options && i < orig_nb_streams)
3286  ? &options[i] : NULL);
3287  } while (err > 0 && !has_codec_parameters(st, NULL));
3288 
3289  if (err < 0) {
3290  av_log(ic, AV_LOG_INFO,
3291  "decoding for stream %d failed\n", st->index);
3292  }
3293  }
3294  }
3295  }
3296 
3297  // close codecs which were opened in try_decode_frame()
3298  for (i = 0; i < ic->nb_streams; i++) {
3299  st = ic->streams[i];
3300  avcodec_close(st->codec);
3301  }
3302 
3303  ff_rfps_calculate(ic);
3304 
3305  for (i = 0; i < ic->nb_streams; i++) {
3306  st = ic->streams[i];
3307  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
3311  st->codec->codec_tag= tag;
3312  }
3313 
3314  /* estimate average framerate if not set by demuxer */
3315  if (st->info->codec_info_duration_fields &&
3316  !st->avg_frame_rate.num &&
3317  st->info->codec_info_duration) {
3318  int best_fps = 0;
3319  double best_error = 0.01;
3320 
3321  if (st->info->codec_info_duration >= INT64_MAX / st->time_base.num / 2||
3322  st->info->codec_info_duration_fields >= INT64_MAX / st->time_base.den ||
3323  st->info->codec_info_duration < 0)
3324  continue;
3326  st->info->codec_info_duration_fields * (int64_t) st->time_base.den,
3327  st->info->codec_info_duration * 2 * (int64_t) st->time_base.num, 60000);
3328 
3329  /* Round guessed framerate to a "standard" framerate if it's
3330  * within 1% of the original estimate. */
3331  for (j = 0; j < MAX_STD_TIMEBASES; j++) {
3332  AVRational std_fps = { get_std_framerate(j), 12 * 1001 };
3333  double error = fabs(av_q2d(st->avg_frame_rate) /
3334  av_q2d(std_fps) - 1);
3335 
3336  if (error < best_error) {
3337  best_error = error;
3338  best_fps = std_fps.num;
3339  }
3340  }
3341  if (best_fps)
3343  best_fps, 12 * 1001, INT_MAX);
3344  }
3345 
3346  if (!st->r_frame_rate.num) {
3347  if ( st->codec->time_base.den * (int64_t) st->time_base.num
3348  <= st->codec->time_base.num * st->codec->ticks_per_frame * (int64_t) st->time_base.den) {
3349  st->r_frame_rate.num = st->codec->time_base.den;
3351  } else {
3352  st->r_frame_rate.num = st->time_base.den;
3353  st->r_frame_rate.den = st->time_base.num;
3354  }
3355  }
3357  AVRational hw_ratio = { st->codec->height, st->codec->width };
3359  hw_ratio);
3360  }
3361  } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
3362  if (!st->codec->bits_per_coded_sample)
3365  // set stream disposition based on audio service type
3366  switch (st->codec->audio_service_type) {
3369  break;
3372  break;
3375  break;
3378  break;
3381  break;
3382  }
3383  }
3384  }
3385 
3386  if (probesize)
3387  estimate_timings(ic, old_offset);
3388 
3389  av_opt_set(ic, "skip_clear", "0", AV_OPT_SEARCH_CHILDREN);
3390 
3391  if (ret >= 0 && ic->nb_streams)
3392  /* We could not have all the codec parameters before EOF. */
3393  ret = -1;
3394  for (i = 0; i < ic->nb_streams; i++) {
3395  const char *errmsg;
3396  st = ic->streams[i];
3397  if (!has_codec_parameters(st, &errmsg)) {
3398  char buf[256];
3399  avcodec_string(buf, sizeof(buf), st->codec, 0);
3400  av_log(ic, AV_LOG_WARNING,
3401  "Could not find codec parameters for stream %d (%s): %s\n"
3402  "Consider increasing the value for the 'analyzeduration' and 'probesize' options\n",
3403  i, buf, errmsg);
3404  } else {
3405  ret = 0;
3406  }
3407  }
3408 
3410 
3411 find_stream_info_err:
3412  for (i = 0; i < ic->nb_streams; i++) {
3413  st = ic->streams[i];
3414  if (ic->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
3415  ic->streams[i]->codec->thread_count = 0;
3416  if (st->info)
3417  av_freep(&st->info->duration_error);
3418  av_freep(&ic->streams[i]->info);
3419  }
3420  if (ic->pb)
3421  av_log(ic, AV_LOG_DEBUG, "After avformat_find_stream_info() pos: %"PRId64" bytes read:%"PRId64" seeks:%d frames:%d\n",
3422  avio_tell(ic->pb), ic->pb->bytes_read, ic->pb->seek_count, count);
3423  return ret;
3424 }
3425 
3427 {
3428  int i, j;
3429 
3430  for (i = 0; i < ic->nb_programs; i++) {
3431  if (ic->programs[i] == last) {
3432  last = NULL;
3433  } else {
3434  if (!last)
3435  for (j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
3436  if (ic->programs[i]->stream_index[j] == s)
3437  return ic->programs[i];
3438  }
3439  }
3440  return NULL;
3441 }
3442 
3444  int wanted_stream_nb, int related_stream,
3445  AVCodec **decoder_ret, int flags)
3446 {
3447  int i, nb_streams = ic->nb_streams;
3448  int ret = AVERROR_STREAM_NOT_FOUND, best_count = -1, best_bitrate = -1, best_multiframe = -1, count, bitrate, multiframe;
3449  unsigned *program = NULL;
3450  const AVCodec *decoder = NULL, *best_decoder = NULL;
3451 
3452  if (related_stream >= 0 && wanted_stream_nb < 0) {
3453  AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
3454  if (p) {
3455  program = p->stream_index;
3456  nb_streams = p->nb_stream_indexes;
3457  }
3458  }
3459  for (i = 0; i < nb_streams; i++) {
3460  int real_stream_index = program ? program[i] : i;
3461  AVStream *st = ic->streams[real_stream_index];
3462  AVCodecContext *avctx = st->codec;
3463  if (avctx->codec_type != type)
3464  continue;
3465  if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
3466  continue;
3467  if (wanted_stream_nb != real_stream_index &&
3470  continue;
3471  if (type == AVMEDIA_TYPE_AUDIO && !avctx->channels)
3472  continue;
3473  if (decoder_ret) {
3474  decoder = find_decoder(ic, st, st->codec->codec_id);
3475  if (!decoder) {
3476  if (ret < 0)
3478  continue;
3479  }
3480  }
3482  bitrate = avctx->bit_rate;
3483  if (!bitrate)
3484  bitrate = avctx->rc_max_rate;
3485  multiframe = FFMIN(5, count);
3486  if ((best_multiframe > multiframe) ||
3487  (best_multiframe == multiframe && best_bitrate > bitrate) ||
3488  (best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
3489  continue;
3490  best_count = count;
3491  best_bitrate = bitrate;
3492  best_multiframe = multiframe;
3493  ret = real_stream_index;
3494  best_decoder = decoder;
3495  if (program && i == nb_streams - 1 && ret < 0) {
3496  program = NULL;
3497  nb_streams = ic->nb_streams;
3498  /* no related stream found, try again with everything */
3499  i = 0;
3500  }
3501  }
3502  if (decoder_ret)
3503  *decoder_ret = (AVCodec*)best_decoder;
3504  return ret;
3505 }
3506 
3507 /*******************************************************/
3508 
3510 {
3511  if (s->iformat->read_play)
3512  return s->iformat->read_play(s);
3513  if (s->pb)
3514  return avio_pause(s->pb, 0);
3515  return AVERROR(ENOSYS);
3516 }
3517 
3519 {
3520  if (s->iformat->read_pause)
3521  return s->iformat->read_pause(s);
3522  if (s->pb)
3523  return avio_pause(s->pb, 1);
3524  return AVERROR(ENOSYS);
3525 }
3526 
3528  int j;
3529  av_assert0(s->nb_streams>0);
3530  av_assert0(s->streams[ s->nb_streams - 1 ] == st);
3531 
3532  for (j = 0; j < st->nb_side_data; j++)
3533  av_freep(&st->side_data[j].data);
3534  av_freep(&st->side_data);
3535  st->nb_side_data = 0;
3536 
3537  if (st->parser) {
3538  av_parser_close(st->parser);
3539  }
3540  if (st->attached_pic.data)
3542  av_dict_free(&st->metadata);
3543  av_freep(&st->probe_data.buf);
3544  av_freep(&st->index_entries);
3545  av_freep(&st->codec->extradata);
3547  av_freep(&st->codec);
3548  av_freep(&st->priv_data);
3549  if (st->info)
3550  av_freep(&st->info->duration_error);
3551  av_freep(&st->info);
3553  av_freep(&s->streams[ --s->nb_streams ]);
3554 }
3555 
3557 {
3558  int i;
3559 
3560  if (!s)
3561  return;
3562 
3563  av_opt_free(s);
3564  if (s->iformat && s->iformat->priv_class && s->priv_data)
3565  av_opt_free(s->priv_data);
3566  if (s->oformat && s->oformat->priv_class && s->priv_data)
3567  av_opt_free(s->priv_data);
3568 
3569  for (i = s->nb_streams - 1; i >= 0; i--) {
3570  ff_free_stream(s, s->streams[i]);
3571  }
3572  for (i = s->nb_programs - 1; i >= 0; i--) {
3573  av_dict_free(&s->programs[i]->metadata);
3574  av_freep(&s->programs[i]->stream_index);
3575  av_freep(&s->programs[i]);
3576  }
3577  av_freep(&s->programs);
3578  av_freep(&s->priv_data);
3579  while (s->nb_chapters--) {
3581  av_freep(&s->chapters[s->nb_chapters]);
3582  }
3583  av_freep(&s->chapters);
3584  av_dict_free(&s->metadata);
3585  av_freep(&s->streams);
3586  av_freep(&s->internal);
3587  flush_packet_queue(s);
3588  av_free(s);
3589 }
3590 
3592 {
3593  AVFormatContext *s;
3594  AVIOContext *pb;
3595 
3596  if (!ps || !*ps)
3597  return;
3598 
3599  s = *ps;
3600  pb = s->pb;
3601 
3602  if ((s->iformat && strcmp(s->iformat->name, "image2") && s->iformat->flags & AVFMT_NOFILE) ||
3603  (s->flags & AVFMT_FLAG_CUSTOM_IO))
3604  pb = NULL;
3605 
3606  flush_packet_queue(s);
3607 
3608  if (s->iformat)
3609  if (s->iformat->read_close)
3610  s->iformat->read_close(s);
3611 
3613 
3614  *ps = NULL;
3615 
3616  avio_close(pb);
3617 }
3618 
3620 {
3621  AVStream *st;
3622  int i;
3623  AVStream **streams;
3624 
3625  if (s->nb_streams >= INT_MAX/sizeof(*streams))
3626  return NULL;
3627  streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
3628  if (!streams)
3629  return NULL;
3630  s->streams = streams;
3631 
3632  st = av_mallocz(sizeof(AVStream));
3633  if (!st)
3634  return NULL;
3635  if (!(st->info = av_mallocz(sizeof(*st->info)))) {
3636  av_free(st);
3637  return NULL;
3638  }
3639  st->info->last_dts = AV_NOPTS_VALUE;
3640 
3641  st->codec = avcodec_alloc_context3(c);
3642  if (s->iformat) {
3643  /* no default bitrate if decoding */
3644  st->codec->bit_rate = 0;
3645 
3646  /* default pts setting is MPEG-like */
3647  avpriv_set_pts_info(st, 33, 1, 90000);
3648  }
3649 
3650  st->index = s->nb_streams;
3651  st->start_time = AV_NOPTS_VALUE;
3652  st->duration = AV_NOPTS_VALUE;
3653  /* we set the current DTS to 0 so that formats without any timestamps
3654  * but durations get some timestamps, formats with some unknown
3655  * timestamps have their first few packets buffered and the
3656  * timestamps corrected before they are returned to the user */
3657  st->cur_dts = s->iformat ? RELATIVE_TS_BASE : 0;
3658  st->first_dts = AV_NOPTS_VALUE;
3662 
3665  for (i = 0; i < MAX_REORDER_DELAY + 1; i++)
3666  st->pts_buffer[i] = AV_NOPTS_VALUE;
3667 
3668  st->sample_aspect_ratio = (AVRational) { 0, 1 };
3669 
3670 #if FF_API_R_FRAME_RATE
3671  st->info->last_dts = AV_NOPTS_VALUE;
3672 #endif
3675 
3677 
3678  s->streams[s->nb_streams++] = st;
3679  return st;
3680 }
3681 
3683 {
3684  AVProgram *program = NULL;
3685  int i;
3686 
3687  av_dlog(ac, "new_program: id=0x%04x\n", id);
3688 
3689  for (i = 0; i < ac->nb_programs; i++)
3690  if (ac->programs[i]->id == id)
3691  program = ac->programs[i];
3692 
3693  if (!program) {
3694  program = av_mallocz(sizeof(AVProgram));
3695  if (!program)
3696  return NULL;
3697  dynarray_add(&ac->programs, &ac->nb_programs, program);
3698  program->discard = AVDISCARD_NONE;
3699  }
3700  program->id = id;
3703 
3704  program->start_time =
3705  program->end_time = AV_NOPTS_VALUE;
3706 
3707  return program;
3708 }
3709 
3711  int64_t start, int64_t end, const char *title)
3712 {
3713  AVChapter *chapter = NULL;
3714  int i;
3715 
3716  if (end != AV_NOPTS_VALUE && start > end) {
3717  av_log(s, AV_LOG_ERROR, "Chapter end time %"PRId64" before start %"PRId64"\n", end, start);
3718  return NULL;
3719  }
3720 
3721  for (i = 0; i < s->nb_chapters; i++)
3722  if (s->chapters[i]->id == id)
3723  chapter = s->chapters[i];
3724 
3725  if (!chapter) {
3726  chapter = av_mallocz(sizeof(AVChapter));
3727  if (!chapter)
3728  return NULL;
3729  dynarray_add(&s->chapters, &s->nb_chapters, chapter);
3730  }
3731  av_dict_set(&chapter->metadata, "title", title, 0);
3732  chapter->id = id;
3733  chapter->time_base = time_base;
3734  chapter->start = start;
3735  chapter->end = end;
3736 
3737  return chapter;
3738 }
3739 
3740 void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned idx)
3741 {
3742  int i, j;
3743  AVProgram *program = NULL;
3744  void *tmp;
3745 
3746  if (idx >= ac->nb_streams) {
3747  av_log(ac, AV_LOG_ERROR, "stream index %d is not valid\n", idx);
3748  return;
3749  }
3750 
3751  for (i = 0; i < ac->nb_programs; i++) {
3752  if (ac->programs[i]->id != progid)
3753  continue;
3754  program = ac->programs[i];
3755  for (j = 0; j < program->nb_stream_indexes; j++)
3756  if (program->stream_index[j] == idx)
3757  return;
3758 
3759  tmp = av_realloc_array(program->stream_index, program->nb_stream_indexes+1, sizeof(unsigned int));
3760  if (!tmp)
3761  return;
3762  program->stream_index = tmp;
3763  program->stream_index[program->nb_stream_indexes++] = idx;
3764  return;
3765  }
3766 }
3767 
3768 uint64_t ff_ntp_time(void)
3769 {
3770  return (av_gettime() / 1000) * 1000 + NTP_OFFSET_US;
3771 }
3772 
3773 int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
3774 {
3775  const char *p;
3776  char *q, buf1[20], c;
3777  int nd, len, percentd_found;
3778 
3779  q = buf;
3780  p = path;
3781  percentd_found = 0;
3782  for (;;) {
3783  c = *p++;
3784  if (c == '\0')
3785  break;
3786  if (c == '%') {
3787  do {
3788  nd = 0;
3789  while (av_isdigit(*p))
3790  nd = nd * 10 + *p++ - '0';
3791  c = *p++;
3792  } while (av_isdigit(c));
3793 
3794  switch (c) {
3795  case '%':
3796  goto addchar;
3797  case 'd':
3798  if (percentd_found)
3799  goto fail;
3800  percentd_found = 1;
3801  snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
3802  len = strlen(buf1);
3803  if ((q - buf + len) > buf_size - 1)
3804  goto fail;
3805  memcpy(q, buf1, len);
3806  q += len;
3807  break;
3808  default:
3809  goto fail;
3810  }
3811  } else {
3812 addchar:
3813  if ((q - buf) < buf_size - 1)
3814  *q++ = c;
3815  }
3816  }
3817  if (!percentd_found)
3818  goto fail;
3819  *q = '\0';
3820  return 0;
3821 fail:
3822  *q = '\0';
3823  return -1;
3824 }
3825 
3826 void av_url_split(char *proto, int proto_size,
3827  char *authorization, int authorization_size,
3828  char *hostname, int hostname_size,
3829  int *port_ptr, char *path, int path_size, const char *url)
3830 {
3831  const char *p, *ls, *ls2, *at, *at2, *col, *brk;
3832 
3833  if (port_ptr)
3834  *port_ptr = -1;
3835  if (proto_size > 0)
3836  proto[0] = 0;
3837  if (authorization_size > 0)
3838  authorization[0] = 0;
3839  if (hostname_size > 0)
3840  hostname[0] = 0;
3841  if (path_size > 0)
3842  path[0] = 0;
3843 
3844  /* parse protocol */
3845  if ((p = strchr(url, ':'))) {
3846  av_strlcpy(proto, url, FFMIN(proto_size, p + 1 - url));
3847  p++; /* skip ':' */
3848  if (*p == '/')
3849  p++;
3850  if (*p == '/')
3851  p++;
3852  } else {
3853  /* no protocol means plain filename */
3854  av_strlcpy(path, url, path_size);
3855  return;
3856  }
3857 
3858  /* separate path from hostname */
3859  ls = strchr(p, '/');
3860  ls2 = strchr(p, '?');
3861  if (!ls)
3862  ls = ls2;
3863  else if (ls && ls2)
3864  ls = FFMIN(ls, ls2);
3865  if (ls)
3866  av_strlcpy(path, ls, path_size);
3867  else
3868  ls = &p[strlen(p)]; // XXX
3869 
3870  /* the rest is hostname, use that to parse auth/port */
3871  if (ls != p) {
3872  /* authorization (user[:pass]@hostname) */
3873  at2 = p;
3874  while ((at = strchr(p, '@')) && at < ls) {
3875  av_strlcpy(authorization, at2,
3876  FFMIN(authorization_size, at + 1 - at2));
3877  p = at + 1; /* skip '@' */
3878  }
3879 
3880  if (*p == '[' && (brk = strchr(p, ']')) && brk < ls) {
3881  /* [host]:port */
3882  av_strlcpy(hostname, p + 1,
3883  FFMIN(hostname_size, brk - p));
3884  if (brk[1] == ':' && port_ptr)
3885  *port_ptr = atoi(brk + 2);
3886  } else if ((col = strchr(p, ':')) && col < ls) {
3887  av_strlcpy(hostname, p,
3888  FFMIN(col + 1 - p, hostname_size));
3889  if (port_ptr)
3890  *port_ptr = atoi(col + 1);
3891  } else
3892  av_strlcpy(hostname, p,
3893  FFMIN(ls + 1 - p, hostname_size));
3894  }
3895 }
3896 
3897 char *ff_data_to_hex(char *buff, const uint8_t *src, int s, int lowercase)
3898 {
3899  int i;
3900  static const char hex_table_uc[16] = { '0', '1', '2', '3',
3901  '4', '5', '6', '7',
3902  '8', '9', 'A', 'B',
3903  'C', 'D', 'E', 'F' };
3904  static const char hex_table_lc[16] = { '0', '1', '2', '3',
3905  '4', '5', '6', '7',
3906  '8', '9', 'a', 'b',
3907  'c', 'd', 'e', 'f' };
3908  const char *hex_table = lowercase ? hex_table_lc : hex_table_uc;
3909 
3910  for (i = 0; i < s; i++) {
3911  buff[i * 2] = hex_table[src[i] >> 4];
3912  buff[i * 2 + 1] = hex_table[src[i] & 0xF];
3913  }
3914 
3915  return buff;
3916 }
3917 
3918 int ff_hex_to_data(uint8_t *data, const char *p)
3919 {
3920  int c, len, v;
3921 
3922  len = 0;
3923  v = 1;
3924  for (;;) {
3925  p += strspn(p, SPACE_CHARS);
3926  if (*p == '\0')
3927  break;
3928  c = av_toupper((unsigned char) *p++);
3929  if (c >= '0' && c <= '9')
3930  c = c - '0';
3931  else if (c >= 'A' && c <= 'F')
3932  c = c - 'A' + 10;
3933  else
3934  break;
3935  v = (v << 4) | c;
3936  if (v & 0x100) {
3937  if (data)
3938  data[len] = v;
3939  len++;
3940  v = 1;
3941  }
3942  }
3943  return len;
3944 }
3945 
3946 void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
3947  unsigned int pts_num, unsigned int pts_den)
3948 {
3949  AVRational new_tb;
3950  if (av_reduce(&new_tb.num, &new_tb.den, pts_num, pts_den, INT_MAX)) {
3951  if (new_tb.num != pts_num)
3952  av_log(NULL, AV_LOG_DEBUG,
3953  "st:%d removing common factor %d from timebase\n",
3954  s->index, pts_num / new_tb.num);
3955  } else
3956  av_log(NULL, AV_LOG_WARNING,
3957  "st:%d has too large timebase, reducing\n", s->index);
3958 
3959  if (new_tb.num <= 0 || new_tb.den <= 0) {
3960  av_log(NULL, AV_LOG_ERROR,
3961  "Ignoring attempt to set invalid timebase %d/%d for st:%d\n",
3962  new_tb.num, new_tb.den,
3963  s->index);
3964  return;
3965  }
3966  s->time_base = new_tb;
3967  av_codec_set_pkt_timebase(s->codec, new_tb);
3968  s->pts_wrap_bits = pts_wrap_bits;
3969 }
3970 
3971 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
3972  void *context)
3973 {
3974  const char *ptr = str;
3975 
3976  /* Parse key=value pairs. */
3977  for (;;) {
3978  const char *key;
3979  char *dest = NULL, *dest_end;
3980  int key_len, dest_len = 0;
3981 
3982  /* Skip whitespace and potential commas. */
3983  while (*ptr && (av_isspace(*ptr) || *ptr == ','))
3984  ptr++;
3985  if (!*ptr)
3986  break;
3987 
3988  key = ptr;
3989 
3990  if (!(ptr = strchr(key, '=')))
3991  break;
3992  ptr++;
3993  key_len = ptr - key;
3994 
3995  callback_get_buf(context, key, key_len, &dest, &dest_len);
3996  dest_end = dest + dest_len - 1;
3997 
3998  if (*ptr == '\"') {
3999  ptr++;
4000  while (*ptr && *ptr != '\"') {
4001  if (*ptr == '\\') {
4002  if (!ptr[1])
4003  break;
4004  if (dest && dest < dest_end)
4005  *dest++ = ptr[1];
4006  ptr += 2;
4007  } else {
4008  if (dest && dest < dest_end)
4009  *dest++ = *ptr;
4010  ptr++;
4011  }
4012  }
4013  if (*ptr == '\"')
4014  ptr++;
4015  } else {
4016  for (; *ptr && !(av_isspace(*ptr) || *ptr == ','); ptr++)
4017  if (dest && dest < dest_end)
4018  *dest++ = *ptr;
4019  }
4020  if (dest)
4021  *dest = 0;
4022  }
4023 }
4024 
4026 {
4027  int i;
4028  for (i = 0; i < s->nb_streams; i++)
4029  if (s->streams[i]->id == id)
4030  return i;
4031  return -1;
4032 }
4033 
4034 int64_t ff_iso8601_to_unix_time(const char *datestr)
4035 {
4036  struct tm time1 = { 0 }, time2 = { 0 };
4037  char *ret1, *ret2;
4038  ret1 = av_small_strptime(datestr, "%Y - %m - %d %H:%M:%S", &time1);
4039  ret2 = av_small_strptime(datestr, "%Y - %m - %dT%H:%M:%S", &time2);
4040  if (ret2 && !ret1)
4041  return av_timegm(&time2);
4042  else
4043  return av_timegm(&time1);
4044 }
4045 
4047  int std_compliance)
4048 {
4049  if (ofmt) {
4050  if (ofmt->query_codec)
4051  return ofmt->query_codec(codec_id, std_compliance);
4052  else if (ofmt->codec_tag)
4053  return !!av_codec_get_tag(ofmt->codec_tag, codec_id);
4054  else if (codec_id == ofmt->video_codec ||
4055  codec_id == ofmt->audio_codec ||
4056  codec_id == ofmt->subtitle_codec)
4057  return 1;
4058  }
4059  return AVERROR_PATCHWELCOME;
4060 }
4061 
4063 {
4064 #if CONFIG_NETWORK
4065  int ret;
4067  if ((ret = ff_network_init()) < 0)
4068  return ret;
4069  ff_tls_init();
4070 #endif
4071  return 0;
4072 }
4073 
4075 {
4076 #if CONFIG_NETWORK
4077  ff_network_close();
4078  ff_tls_deinit();
4079 #endif
4080  return 0;
4081 }
4082 
4084  uint64_t channel_layout, int32_t sample_rate,
4086 {
4087  uint32_t flags = 0;
4088  int size = 4;
4089  uint8_t *data;
4090  if (!pkt)
4091  return AVERROR(EINVAL);
4092  if (channels) {
4093  size += 4;
4095  }
4096  if (channel_layout) {
4097  size += 8;
4099  }
4100  if (sample_rate) {
4101  size += 4;
4103  }
4104  if (width || height) {
4105  size += 8;
4107  }
4109  if (!data)
4110  return AVERROR(ENOMEM);
4111  bytestream_put_le32(&data, flags);
4112  if (channels)
4113  bytestream_put_le32(&data, channels);
4114  if (channel_layout)
4115  bytestream_put_le64(&data, channel_layout);
4116  if (sample_rate)
4117  bytestream_put_le32(&data, sample_rate);
4118  if (width || height) {
4119  bytestream_put_le32(&data, width);
4120  bytestream_put_le32(&data, height);
4121  }
4122  return 0;
4123 }
4124 
4126 {
4127  AVRational undef = {0, 1};
4128  AVRational stream_sample_aspect_ratio = stream ? stream->sample_aspect_ratio : undef;
4129  AVRational codec_sample_aspect_ratio = stream && stream->codec ? stream->codec->sample_aspect_ratio : undef;
4130  AVRational frame_sample_aspect_ratio = frame ? frame->sample_aspect_ratio : codec_sample_aspect_ratio;
4131 
4132  av_reduce(&stream_sample_aspect_ratio.num, &stream_sample_aspect_ratio.den,
4133  stream_sample_aspect_ratio.num, stream_sample_aspect_ratio.den, INT_MAX);
4134  if (stream_sample_aspect_ratio.num <= 0 || stream_sample_aspect_ratio.den <= 0)
4135  stream_sample_aspect_ratio = undef;
4136 
4137  av_reduce(&frame_sample_aspect_ratio.num, &frame_sample_aspect_ratio.den,
4138  frame_sample_aspect_ratio.num, frame_sample_aspect_ratio.den, INT_MAX);
4139  if (frame_sample_aspect_ratio.num <= 0 || frame_sample_aspect_ratio.den <= 0)
4140  frame_sample_aspect_ratio = undef;
4141 
4142  if (stream_sample_aspect_ratio.num)
4143  return stream_sample_aspect_ratio;
4144  else
4145  return frame_sample_aspect_ratio;
4146 }
4147 
4149 {
4150  AVRational fr = st->r_frame_rate;
4151