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segment.c
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1 /*
2  * Copyright (c) 2011, Luca Barbato
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file generic segmenter
23  * M3U8 specification can be find here:
24  * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}
25  */
26 
27 /* #define DEBUG */
28 
29 #include <float.h>
30 
31 #include "avformat.h"
32 #include "internal.h"
33 
34 #include "libavutil/avassert.h"
35 #include "libavutil/log.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/avstring.h"
38 #include "libavutil/parseutils.h"
39 #include "libavutil/mathematics.h"
40 #include "libavutil/timestamp.h"
41 
42 typedef struct SegmentListEntry {
43  int index;
45  int64_t start_pts;
46  int64_t offset_pts;
47  char filename[1024];
50 
51 typedef enum {
56  LIST_TYPE_EXT, ///< deprecated
59 } ListType;
60 
61 #define SEGMENT_LIST_FLAG_CACHE 1
62 #define SEGMENT_LIST_FLAG_LIVE 2
63 
64 typedef struct {
65  const AVClass *class; /**< Class for private options. */
66  int segment_idx; ///< index of the segment file to write, starting from 0
67  int segment_idx_wrap; ///< number after which the index wraps
68  int segment_count; ///< number of segment files already written
71  char *format; ///< format to use for output segment files
72  char *list; ///< filename for the segment list file
73  int list_flags; ///< flags affecting list generation
74  int list_size; ///< number of entries for the segment list file
75  ListType list_type; ///< set the list type
76  AVIOContext *list_pb; ///< list file put-byte context
77  char *time_str; ///< segment duration specification string
78  int64_t time; ///< segment duration
79 
80  char *times_str; ///< segment times specification string
81  int64_t *times; ///< list of segment interval specification
82  int nb_times; ///< number of elments in the times array
83 
84  char *frames_str; ///< segment frame numbers specification string
85  int *frames; ///< list of frame number specification
86  int nb_frames; ///< number of elments in the frames array
88 
89  int64_t time_delta;
90  int individual_header_trailer; /**< Set by a private option. */
91  int write_header_trailer; /**< Set by a private option. */
92 
93  int reset_timestamps; ///< reset timestamps at the begin of each segment
94  int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds
95  char *reference_stream_specifier; ///< reference stream specifier
97 
101 
102  int is_first_pkt; ///< tells if it is the first packet in the segment
104 
105 static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
106 {
107  int needs_quoting = !!str[strcspn(str, "\",\n\r")];
108 
109  if (needs_quoting)
110  avio_w8(ctx, '"');
111 
112  for (; *str; str++) {
113  if (*str == '"')
114  avio_w8(ctx, '"');
115  avio_w8(ctx, *str);
116  }
117  if (needs_quoting)
118  avio_w8(ctx, '"');
119 }
120 
122 {
123  SegmentContext *seg = s->priv_data;
124  AVFormatContext *oc;
125  int i;
126 
127  seg->avf = oc = avformat_alloc_context();
128  if (!oc)
129  return AVERROR(ENOMEM);
130 
131  oc->oformat = seg->oformat;
133  av_dict_copy(&oc->metadata, s->metadata, 0);
134 
135  for (i = 0; i < s->nb_streams; i++) {
136  AVStream *st;
137  AVCodecContext *icodec, *ocodec;
138 
139  if (!(st = avformat_new_stream(oc, NULL)))
140  return AVERROR(ENOMEM);
141  icodec = s->streams[i]->codec;
142  ocodec = st->codec;
143  avcodec_copy_context(ocodec, icodec);
144  if (!oc->oformat->codec_tag ||
145  av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == ocodec->codec_id ||
146  av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0) {
147  ocodec->codec_tag = icodec->codec_tag;
148  } else {
149  ocodec->codec_tag = 0;
150  }
152  }
153 
154  return 0;
155 }
156 
158 {
159  SegmentContext *seg = s->priv_data;
160  AVFormatContext *oc = seg->avf;
161 
162  if (seg->segment_idx_wrap)
163  seg->segment_idx %= seg->segment_idx_wrap;
164  if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
165  s->filename, seg->segment_idx) < 0) {
166  av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
167  return AVERROR(EINVAL);
168  }
169  av_strlcpy(seg->cur_entry.filename, oc->filename, sizeof(seg->cur_entry.filename));
170  return 0;
171 }
172 
174 {
175  SegmentContext *seg = s->priv_data;
176  AVFormatContext *oc = seg->avf;
177  int err = 0;
178 
179  if (write_header) {
181  seg->avf = NULL;
182  if ((err = segment_mux_init(s)) < 0)
183  return err;
184  oc = seg->avf;
185  }
186 
187  seg->segment_idx++;
188  if ((err = set_segment_filename(s)) < 0)
189  return err;
190 
191  if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
192  &s->interrupt_callback, NULL)) < 0)
193  return err;
194 
195  if (oc->oformat->priv_class && oc->priv_data)
196  av_opt_set(oc->priv_data, "resend_headers", "1", 0); /* mpegts specific */
197 
198  if (write_header) {
199  if ((err = avformat_write_header(oc, NULL)) < 0)
200  return err;
201  }
202 
203  seg->is_first_pkt = 1;
204  return 0;
205 }
206 
208 {
209  SegmentContext *seg = s->priv_data;
210  int ret;
211 
212  ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE,
213  &s->interrupt_callback, NULL);
214  if (ret < 0)
215  return ret;
216 
217  if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
218  SegmentListEntry *entry;
219  double max_duration = 0;
220 
221  avio_printf(seg->list_pb, "#EXTM3U\n");
222  avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
223  avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
224  avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
225  seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
226 
227  for (entry = seg->segment_list_entries; entry; entry = entry->next)
228  max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
229  avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
230  } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
231  avio_printf(seg->list_pb, "ffconcat version 1.0\n");
232  }
233 
234  return ret;
235 }
236 
237 static void segment_list_print_entry(AVIOContext *list_ioctx,
238  ListType list_type,
239  const SegmentListEntry *list_entry,
240  void *log_ctx)
241 {
242  switch (list_type) {
243  case LIST_TYPE_FLAT:
244  avio_printf(list_ioctx, "%s\n", list_entry->filename);
245  break;
246  case LIST_TYPE_CSV:
247  case LIST_TYPE_EXT:
248  print_csv_escaped_str(list_ioctx, list_entry->filename);
249  avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
250  break;
251  case LIST_TYPE_M3U8:
252  avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
253  list_entry->end_time - list_entry->start_time, list_entry->filename);
254  break;
255  case LIST_TYPE_FFCONCAT:
256  {
257  char *buf;
258  if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
259  av_log(log_ctx, AV_LOG_WARNING,
260  "Error writing list entry '%s' in list file\n", list_entry->filename);
261  return;
262  }
263  avio_printf(list_ioctx, "file %s\n", buf);
264  av_free(buf);
265  break;
266  }
267  default:
268  av_assert0(!"Invalid list type");
269  }
270 }
271 
272 static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
273 {
274  SegmentContext *seg = s->priv_data;
275  AVFormatContext *oc = seg->avf;
276  int ret = 0;
277 
278  av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
279  if (write_trailer)
280  ret = av_write_trailer(oc);
281 
282  if (ret < 0)
283  av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
284  oc->filename);
285 
286  if (seg->list) {
287  if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
288  SegmentListEntry *entry = av_mallocz(sizeof(*entry));
289  if (!entry) {
290  ret = AVERROR(ENOMEM);
291  goto end;
292  }
293 
294  /* append new element */
295  memcpy(entry, &seg->cur_entry, sizeof(*entry));
296  if (!seg->segment_list_entries)
298  else
299  seg->segment_list_entries_end->next = entry;
300  seg->segment_list_entries_end = entry;
301 
302  /* drop first item */
303  if (seg->list_size && seg->segment_count > seg->list_size) {
304  entry = seg->segment_list_entries;
306  av_freep(&entry);
307  }
308 
309  avio_close(seg->list_pb);
310  if ((ret = segment_list_open(s)) < 0)
311  goto end;
312  for (entry = seg->segment_list_entries; entry; entry = entry->next)
313  segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
314  if (seg->list_type == LIST_TYPE_M3U8 && is_last)
315  avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
316  } else {
317  segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
318  }
319  avio_flush(seg->list_pb);
320  }
321 
322  av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
323  seg->avf->filename, seg->segment_count);
324  seg->segment_count++;
325 
326 end:
327  avio_close(oc->pb);
328 
329  return ret;
330 }
331 
332 static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
333  const char *times_str)
334 {
335  char *p;
336  int i, ret = 0;
337  char *times_str1 = av_strdup(times_str);
338  char *saveptr = NULL;
339 
340  if (!times_str1)
341  return AVERROR(ENOMEM);
342 
343 #define FAIL(err) ret = err; goto end
344 
345  *nb_times = 1;
346  for (p = times_str1; *p; p++)
347  if (*p == ',')
348  (*nb_times)++;
349 
350  *times = av_malloc(sizeof(**times) * *nb_times);
351  if (!*times) {
352  av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
353  FAIL(AVERROR(ENOMEM));
354  }
355 
356  p = times_str1;
357  for (i = 0; i < *nb_times; i++) {
358  int64_t t;
359  char *tstr = av_strtok(p, ",", &saveptr);
360  p = NULL;
361 
362  if (!tstr || !tstr[0]) {
363  av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
364  times_str);
365  FAIL(AVERROR(EINVAL));
366  }
367 
368  ret = av_parse_time(&t, tstr, 1);
369  if (ret < 0) {
370  av_log(log_ctx, AV_LOG_ERROR,
371  "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
372  FAIL(AVERROR(EINVAL));
373  }
374  (*times)[i] = t;
375 
376  /* check on monotonicity */
377  if (i && (*times)[i-1] > (*times)[i]) {
378  av_log(log_ctx, AV_LOG_ERROR,
379  "Specified time %f is greater than the following time %f\n",
380  (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
381  FAIL(AVERROR(EINVAL));
382  }
383  }
384 
385 end:
386  av_free(times_str1);
387  return ret;
388 }
389 
390 static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
391  const char *frames_str)
392 {
393  char *p;
394  int i, ret = 0;
395  char *frames_str1 = av_strdup(frames_str);
396  char *saveptr = NULL;
397 
398  if (!frames_str1)
399  return AVERROR(ENOMEM);
400 
401 #define FAIL(err) ret = err; goto end
402 
403  *nb_frames = 1;
404  for (p = frames_str1; *p; p++)
405  if (*p == ',')
406  (*nb_frames)++;
407 
408  *frames = av_malloc(sizeof(**frames) * *nb_frames);
409  if (!*frames) {
410  av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
411  FAIL(AVERROR(ENOMEM));
412  }
413 
414  p = frames_str1;
415  for (i = 0; i < *nb_frames; i++) {
416  long int f;
417  char *tailptr;
418  char *fstr = av_strtok(p, ",", &saveptr);
419 
420  p = NULL;
421  if (!fstr) {
422  av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
423  frames_str);
424  FAIL(AVERROR(EINVAL));
425  }
426  f = strtol(fstr, &tailptr, 10);
427  if (*tailptr || f <= 0 || f >= INT_MAX) {
428  av_log(log_ctx, AV_LOG_ERROR,
429  "Invalid argument '%s', must be a positive integer <= INT64_MAX\n",
430  fstr);
431  FAIL(AVERROR(EINVAL));
432  }
433  (*frames)[i] = f;
434 
435  /* check on monotonicity */
436  if (i && (*frames)[i-1] > (*frames)[i]) {
437  av_log(log_ctx, AV_LOG_ERROR,
438  "Specified frame %d is greater than the following frame %d\n",
439  (*frames)[i], (*frames)[i-1]);
440  FAIL(AVERROR(EINVAL));
441  }
442  }
443 
444 end:
445  av_free(frames_str1);
446  return ret;
447 }
448 
449 static int open_null_ctx(AVIOContext **ctx)
450 {
451  int buf_size = 32768;
452  uint8_t *buf = av_malloc(buf_size);
453  if (!buf)
454  return AVERROR(ENOMEM);
455  *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
456  if (!*ctx) {
457  av_free(buf);
458  return AVERROR(ENOMEM);
459  }
460  return 0;
461 }
462 
463 static void close_null_ctx(AVIOContext *pb)
464 {
465  av_free(pb->buffer);
466  av_free(pb);
467 }
468 
470 {
471  SegmentContext *seg = s->priv_data;
472  int ret, i;
473 
474  seg->reference_stream_index = -1;
475  if (!strcmp(seg->reference_stream_specifier, "auto")) {
476  /* select first index of type with highest priority */
477  int type_index_map[AVMEDIA_TYPE_NB];
478  static const enum AVMediaType type_priority_list[] = {
484  };
485  enum AVMediaType type;
486 
487  for (i = 0; i < AVMEDIA_TYPE_NB; i++)
488  type_index_map[i] = -1;
489 
490  /* select first index for each type */
491  for (i = 0; i < s->nb_streams; i++) {
492  type = s->streams[i]->codec->codec_type;
493  if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
494  /* ignore attached pictures/cover art streams */
496  type_index_map[type] = i;
497  }
498 
499  for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
500  type = type_priority_list[i];
501  if ((seg->reference_stream_index = type_index_map[type]) >= 0)
502  break;
503  }
504  } else {
505  for (i = 0; i < s->nb_streams; i++) {
508  if (ret < 0)
509  return ret;
510  if (ret > 0) {
511  seg->reference_stream_index = i;
512  break;
513  }
514  }
515  }
516 
517  if (seg->reference_stream_index < 0) {
518  av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
520  return AVERROR(EINVAL);
521  }
522 
523  return 0;
524 }
525 
527 {
528  SegmentContext *seg = s->priv_data;
529  AVFormatContext *oc = NULL;
530  int ret;
531 
532  seg->segment_count = 0;
533  if (!seg->write_header_trailer)
534  seg->individual_header_trailer = 0;
535 
536  if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
537  av_log(s, AV_LOG_ERROR,
538  "segment_time, segment_times, and segment_frames options "
539  "are mutually exclusive, select just one of them\n");
540  return AVERROR(EINVAL);
541  }
542 
543  if (seg->times_str) {
544  if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
545  return ret;
546  } else if (seg->frames_str) {
547  if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
548  return ret;
549  } else {
550  /* set default value if not specified */
551  if (!seg->time_str)
552  seg->time_str = av_strdup("2");
553  if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
554  av_log(s, AV_LOG_ERROR,
555  "Invalid time duration specification '%s' for segment_time option\n",
556  seg->time_str);
557  return ret;
558  }
559  }
560 
561  if (seg->list) {
562  if (seg->list_type == LIST_TYPE_UNDEFINED) {
563  if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
564  else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
565  else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
566  else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
567  else seg->list_type = LIST_TYPE_FLAT;
568  }
569  if ((ret = segment_list_open(s)) < 0)
570  goto fail;
571  }
572  if (seg->list_type == LIST_TYPE_EXT)
573  av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
574 
575  if ((ret = select_reference_stream(s)) < 0)
576  goto fail;
577  av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
580 
581  seg->oformat = av_guess_format(seg->format, s->filename, NULL);
582 
583  if (!seg->oformat) {
585  goto fail;
586  }
587  if (seg->oformat->flags & AVFMT_NOFILE) {
588  av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
589  seg->oformat->name);
590  ret = AVERROR(EINVAL);
591  goto fail;
592  }
593 
594  if ((ret = segment_mux_init(s)) < 0)
595  goto fail;
596  oc = seg->avf;
597 
598  if ((ret = set_segment_filename(s)) < 0)
599  goto fail;
600 
601  if (seg->write_header_trailer) {
602  if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
603  &s->interrupt_callback, NULL)) < 0)
604  goto fail;
605  } else {
606  if ((ret = open_null_ctx(&oc->pb)) < 0)
607  goto fail;
608  }
609 
610  if ((ret = avformat_write_header(oc, NULL)) < 0) {
611  avio_close(oc->pb);
612  goto fail;
613  }
614  seg->is_first_pkt = 1;
615 
616  if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
617  s->avoid_negative_ts = 1;
618 
619  if (!seg->write_header_trailer) {
620  close_null_ctx(oc->pb);
621  if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
622  &s->interrupt_callback, NULL)) < 0)
623  goto fail;
624  }
625 
626 fail:
627  if (ret) {
628  if (seg->list)
629  avio_close(seg->list_pb);
630  if (seg->avf)
632  }
633  return ret;
634 }
635 
637 {
638  SegmentContext *seg = s->priv_data;
639  AVFormatContext *oc = seg->avf;
640  AVStream *st = s->streams[pkt->stream_index];
641  int64_t end_pts = INT64_MAX, offset;
642  int start_frame = INT_MAX;
643  int ret;
644 
645  if (seg->times) {
646  end_pts = seg->segment_count < seg->nb_times ?
647  seg->times[seg->segment_count] : INT64_MAX;
648  } else if (seg->frames) {
649  start_frame = seg->segment_count <= seg->nb_frames ?
650  seg->frames[seg->segment_count] : INT_MAX;
651  } else {
652  end_pts = seg->time * (seg->segment_count+1);
653  }
654 
655  av_dlog(s, "packet stream:%d pts:%s pts_time:%s is_key:%d frame:%d\n",
656  pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
657  pkt->flags & AV_PKT_FLAG_KEY,
658  pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
659 
660  if (pkt->stream_index == seg->reference_stream_index &&
661  pkt->flags & AV_PKT_FLAG_KEY &&
662  (seg->frame_count >= start_frame ||
663  (pkt->pts != AV_NOPTS_VALUE &&
664  av_compare_ts(pkt->pts, st->time_base,
665  end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
666  if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
667  goto fail;
668 
669  if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
670  goto fail;
671 
672  oc = seg->avf;
673 
674  seg->cur_entry.index = seg->segment_idx;
675  seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
677  } else if (pkt->pts != AV_NOPTS_VALUE) {
678  seg->cur_entry.end_time =
679  FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
680  }
681 
682  if (seg->is_first_pkt) {
683  av_log(s, AV_LOG_DEBUG, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
684  seg->avf->filename, pkt->stream_index,
685  av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
686  seg->is_first_pkt = 0;
687  }
688 
689  av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
690  pkt->stream_index,
692  av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
693  av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
694 
695  /* compute new timestamps */
696  offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
698  if (pkt->pts != AV_NOPTS_VALUE)
699  pkt->pts += offset;
700  if (pkt->dts != AV_NOPTS_VALUE)
701  pkt->dts += offset;
702 
703  av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
704  av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
705  av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
706 
707  ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
708 
709 fail:
710  if (pkt->stream_index == seg->reference_stream_index)
711  seg->frame_count++;
712 
713  if (ret < 0) {
714  if (seg->list)
715  avio_close(seg->list_pb);
717  }
718 
719  return ret;
720 }
721 
723 {
724  SegmentContext *seg = s->priv_data;
725  AVFormatContext *oc = seg->avf;
726  SegmentListEntry *cur, *next;
727 
728  int ret;
729  if (!seg->write_header_trailer) {
730  if ((ret = segment_end(s, 0, 1)) < 0)
731  goto fail;
732  open_null_ctx(&oc->pb);
733  ret = av_write_trailer(oc);
734  close_null_ctx(oc->pb);
735  } else {
736  ret = segment_end(s, 1, 1);
737  }
738 fail:
739  if (seg->list)
740  avio_close(seg->list_pb);
741 
742  av_opt_free(seg);
743  av_freep(&seg->times);
744  av_freep(&seg->frames);
745 
746  cur = seg->segment_list_entries;
747  while (cur) {
748  next = cur->next;
749  av_free(cur);
750  cur = next;
751  }
752 
754  return ret;
755 }
756 
757 #define OFFSET(x) offsetof(SegmentContext, x)
758 #define E AV_OPT_FLAG_ENCODING_PARAM
759 static const AVOption options[] = {
760  { "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E },
761  { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
762  { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
763 
764  { "segment_list_flags","set flags affecting segment list generation", OFFSET(list_flags), AV_OPT_TYPE_FLAGS, {.i64 = SEGMENT_LIST_FLAG_CACHE }, 0, UINT_MAX, E, "list_flags"},
765  { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},
766  { "live", "enable live-friendly list generation (useful for HLS)", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_LIVE }, INT_MIN, INT_MAX, E, "list_flags"},
767 
768  { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
769 
770  { "segment_list_type", "set the segment list type", OFFSET(list_type), AV_OPT_TYPE_INT, {.i64 = LIST_TYPE_UNDEFINED}, -1, LIST_TYPE_NB-1, E, "list_type" },
771  { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
772  { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" },
773  { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" },
774  { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
775  { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
776  { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
777 
778  { "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
779  { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 0, E },
780  { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
781  { "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
782  { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
783  { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
784 
785  { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
786  { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
787  { "reset_timestamps", "reset timestamps at the begin of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
788  { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
789  { NULL },
790 };
791 
792 static const AVClass seg_class = {
793  .class_name = "segment muxer",
794  .item_name = av_default_item_name,
795  .option = options,
796  .version = LIBAVUTIL_VERSION_INT,
797 };
798 
800  .name = "segment",
801  .long_name = NULL_IF_CONFIG_SMALL("segment"),
802  .priv_data_size = sizeof(SegmentContext),
807  .priv_class = &seg_class,
808 };
809 
810 static const AVClass sseg_class = {
811  .class_name = "stream_segment muxer",
812  .item_name = av_default_item_name,
813  .option = options,
814  .version = LIBAVUTIL_VERSION_INT,
815 };
816 
818  .name = "stream_segment,ssegment",
819  .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
820  .priv_data_size = sizeof(SegmentContext),
821  .flags = AVFMT_NOFILE,
825  .priv_class = &sseg_class,
826 };