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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 #include <time.h>
31 
32 #include "avformat.h"
33 #include "internal.h"
34 
35 #include "libavutil/avassert.h"
36 #include "libavutil/log.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/avstring.h"
39 #include "libavutil/parseutils.h"
40 #include "libavutil/mathematics.h"
41 #include "libavutil/time.h"
43 #include "libavutil/timestamp.h"
44 
45 typedef struct SegmentListEntry {
46  int index;
48  int64_t start_pts;
49  int64_t offset_pts;
50  char *filename;
52  int64_t last_duration;
54 
55 typedef enum {
60  LIST_TYPE_EXT, ///< deprecated
63 } ListType;
64 
65 #define SEGMENT_LIST_FLAG_CACHE 1
66 #define SEGMENT_LIST_FLAG_LIVE 2
67 
68 typedef struct {
69  const AVClass *class; /**< Class for private options. */
70  int segment_idx; ///< index of the segment file to write, starting from 0
71  int segment_idx_wrap; ///< number after which the index wraps
72  int segment_idx_wrap_nb; ///< number of time the index has wraped
73  int segment_count; ///< number of segment files already written
76  char *format; ///< format to use for output segment files
77  char *format_options_str; ///< format options to use for output segment files
79  char *list; ///< filename for the segment list file
80  int list_flags; ///< flags affecting list generation
81  int list_size; ///< number of entries for the segment list file
82 
83  int use_clocktime; ///< flag to cut segments at regular clock time
84  int64_t last_val; ///< remember last time for wrap around detection
85  int64_t last_cut; ///< remember last cut
87 
88  char *entry_prefix; ///< prefix to add to list entry filenames
89  ListType list_type; ///< set the list type
90  AVIOContext *list_pb; ///< list file put-byte context
91  char *time_str; ///< segment duration specification string
92  int64_t time; ///< segment duration
93  int use_strftime; ///< flag to expand filename with strftime
94 
95  char *times_str; ///< segment times specification string
96  int64_t *times; ///< list of segment interval specification
97  int nb_times; ///< number of elments in the times array
98 
99  char *frames_str; ///< segment frame numbers specification string
100  int *frames; ///< list of frame number specification
101  int nb_frames; ///< number of elments in the frames array
102  int frame_count; ///< total number of reference frames
103  int segment_frame_count; ///< number of reference frames in the segment
104 
105  int64_t time_delta;
106  int individual_header_trailer; /**< Set by a private option. */
107  int write_header_trailer; /**< Set by a private option. */
108 
109  int reset_timestamps; ///< reset timestamps at the begin of each segment
110  int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds
111  char *reference_stream_specifier; ///< reference stream specifier
113 
118 
119 static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
120 {
121  int needs_quoting = !!str[strcspn(str, "\",\n\r")];
122 
123  if (needs_quoting)
124  avio_w8(ctx, '"');
125 
126  for (; *str; str++) {
127  if (*str == '"')
128  avio_w8(ctx, '"');
129  avio_w8(ctx, *str);
130  }
131  if (needs_quoting)
132  avio_w8(ctx, '"');
133 }
134 
136 {
137  SegmentContext *seg = s->priv_data;
138  AVFormatContext *oc;
139  int i;
140  int ret;
141 
142  ret = avformat_alloc_output_context2(&seg->avf, seg->oformat, NULL, NULL);
143  if (ret < 0)
144  return ret;
145  oc = seg->avf;
146 
148  oc->max_delay = s->max_delay;
149  av_dict_copy(&oc->metadata, s->metadata, 0);
150 
151  for (i = 0; i < s->nb_streams; i++) {
152  AVStream *st;
153  AVCodecContext *icodec, *ocodec;
154 
155  if (!(st = avformat_new_stream(oc, NULL)))
156  return AVERROR(ENOMEM);
157  icodec = s->streams[i]->codec;
158  ocodec = st->codec;
159  avcodec_copy_context(ocodec, icodec);
160  if (!oc->oformat->codec_tag ||
161  av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == ocodec->codec_id ||
162  av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0) {
163  ocodec->codec_tag = icodec->codec_tag;
164  } else {
165  ocodec->codec_tag = 0;
166  }
168  st->time_base = s->streams[i]->time_base;
169  av_dict_copy(&st->metadata, s->streams[i]->metadata, 0);
170  }
171 
172  return 0;
173 }
174 
176 {
177  SegmentContext *seg = s->priv_data;
178  AVFormatContext *oc = seg->avf;
179  size_t size;
180 
181  if (seg->segment_idx_wrap)
182  seg->segment_idx %= seg->segment_idx_wrap;
183  if (seg->use_strftime) {
184  time_t now0;
185  struct tm *tm, tmpbuf;
186  time(&now0);
187  tm = localtime_r(&now0, &tmpbuf);
188  if (!strftime(oc->filename, sizeof(oc->filename), s->filename, tm)) {
189  av_log(oc, AV_LOG_ERROR, "Could not get segment filename with strftime\n");
190  return AVERROR(EINVAL);
191  }
192  } else if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
193  s->filename, seg->segment_idx) < 0) {
194  av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
195  return AVERROR(EINVAL);
196  }
197 
198  /* copy modified name in list entry */
199  size = strlen(av_basename(oc->filename)) + 1;
200  if (seg->entry_prefix)
201  size += strlen(seg->entry_prefix);
202 
203  seg->cur_entry.filename = av_mallocz(size);
204  if (!seg->cur_entry.filename)
205  return AVERROR(ENOMEM);
206  snprintf(seg->cur_entry.filename, size, "%s%s",
207  seg->entry_prefix ? seg->entry_prefix : "",
208  av_basename(oc->filename));
209 
210  return 0;
211 }
212 
214 {
215  SegmentContext *seg = s->priv_data;
216  AVFormatContext *oc = seg->avf;
217  int err = 0;
218 
219  if (write_header) {
221  seg->avf = NULL;
222  if ((err = segment_mux_init(s)) < 0)
223  return err;
224  oc = seg->avf;
225  }
226 
227  seg->segment_idx++;
228  if ((seg->segment_idx_wrap) && (seg->segment_idx%seg->segment_idx_wrap == 0))
229  seg->segment_idx_wrap_nb++;
230 
231  if ((err = set_segment_filename(s)) < 0)
232  return err;
233 
234  if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
235  &s->interrupt_callback, NULL)) < 0) {
236  av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
237  return err;
238  }
239 
240  if (oc->oformat->priv_class && oc->priv_data)
241  av_opt_set(oc->priv_data, "mpegts_flags", "+resend_headers", 0);
242 
243  if (write_header) {
244  if ((err = avformat_write_header(oc, NULL)) < 0)
245  return err;
246  }
247 
248  seg->segment_frame_count = 0;
249  return 0;
250 }
251 
253 {
254  SegmentContext *seg = s->priv_data;
255  int ret;
256 
257  ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE,
258  &s->interrupt_callback, NULL);
259  if (ret < 0) {
260  av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list);
261  return ret;
262  }
263 
264  if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
265  SegmentListEntry *entry;
266  double max_duration = 0;
267 
268  avio_printf(seg->list_pb, "#EXTM3U\n");
269  avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
270  avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
271  avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
272  seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
273 
274  av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
276 
277  for (entry = seg->segment_list_entries; entry; entry = entry->next)
278  max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
279  avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
280  } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
281  avio_printf(seg->list_pb, "ffconcat version 1.0\n");
282  }
283 
284  return ret;
285 }
286 
287 static void segment_list_print_entry(AVIOContext *list_ioctx,
288  ListType list_type,
289  const SegmentListEntry *list_entry,
290  void *log_ctx)
291 {
292  switch (list_type) {
293  case LIST_TYPE_FLAT:
294  avio_printf(list_ioctx, "%s\n", list_entry->filename);
295  break;
296  case LIST_TYPE_CSV:
297  case LIST_TYPE_EXT:
298  print_csv_escaped_str(list_ioctx, list_entry->filename);
299  avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
300  break;
301  case LIST_TYPE_M3U8:
302  avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
303  list_entry->end_time - list_entry->start_time, list_entry->filename);
304  break;
305  case LIST_TYPE_FFCONCAT:
306  {
307  char *buf;
308  if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
309  av_log(log_ctx, AV_LOG_WARNING,
310  "Error writing list entry '%s' in list file\n", list_entry->filename);
311  return;
312  }
313  avio_printf(list_ioctx, "file %s\n", buf);
314  av_free(buf);
315  break;
316  }
317  default:
318  av_assert0(!"Invalid list type");
319  }
320 }
321 
322 static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
323 {
324  SegmentContext *seg = s->priv_data;
325  AVFormatContext *oc = seg->avf;
326  int ret = 0;
327 
328  av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
329  if (write_trailer)
330  ret = av_write_trailer(oc);
331 
332  if (ret < 0)
333  av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
334  oc->filename);
335 
336  if (seg->list) {
337  if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
338  SegmentListEntry *entry = av_mallocz(sizeof(*entry));
339  if (!entry) {
340  ret = AVERROR(ENOMEM);
341  goto end;
342  }
343 
344  /* append new element */
345  memcpy(entry, &seg->cur_entry, sizeof(*entry));
346  if (!seg->segment_list_entries)
348  else
349  seg->segment_list_entries_end->next = entry;
350  seg->segment_list_entries_end = entry;
351 
352  /* drop first item */
353  if (seg->list_size && seg->segment_count >= seg->list_size) {
354  entry = seg->segment_list_entries;
356  av_freep(&entry->filename);
357  av_freep(&entry);
358  }
359 
360  avio_closep(&seg->list_pb);
361  if ((ret = segment_list_open(s)) < 0)
362  goto end;
363  for (entry = seg->segment_list_entries; entry; entry = entry->next)
364  segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
365  if (seg->list_type == LIST_TYPE_M3U8 && is_last)
366  avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
367  } else {
368  segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
369  }
370  avio_flush(seg->list_pb);
371  }
372 
373  av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
374  seg->avf->filename, seg->segment_count);
375  seg->segment_count++;
376 
377 end:
378  avio_closep(&oc->pb);
379 
380  return ret;
381 }
382 
383 static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
384  const char *times_str)
385 {
386  char *p;
387  int i, ret = 0;
388  char *times_str1 = av_strdup(times_str);
389  char *saveptr = NULL;
390 
391  if (!times_str1)
392  return AVERROR(ENOMEM);
393 
394 #define FAIL(err) ret = err; goto end
395 
396  *nb_times = 1;
397  for (p = times_str1; *p; p++)
398  if (*p == ',')
399  (*nb_times)++;
400 
401  *times = av_malloc_array(*nb_times, sizeof(**times));
402  if (!*times) {
403  av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
404  FAIL(AVERROR(ENOMEM));
405  }
406 
407  p = times_str1;
408  for (i = 0; i < *nb_times; i++) {
409  int64_t t;
410  char *tstr = av_strtok(p, ",", &saveptr);
411  p = NULL;
412 
413  if (!tstr || !tstr[0]) {
414  av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
415  times_str);
416  FAIL(AVERROR(EINVAL));
417  }
418 
419  ret = av_parse_time(&t, tstr, 1);
420  if (ret < 0) {
421  av_log(log_ctx, AV_LOG_ERROR,
422  "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
423  FAIL(AVERROR(EINVAL));
424  }
425  (*times)[i] = t;
426 
427  /* check on monotonicity */
428  if (i && (*times)[i-1] > (*times)[i]) {
429  av_log(log_ctx, AV_LOG_ERROR,
430  "Specified time %f is greater than the following time %f\n",
431  (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
432  FAIL(AVERROR(EINVAL));
433  }
434  }
435 
436 end:
437  av_free(times_str1);
438  return ret;
439 }
440 
441 static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
442  const char *frames_str)
443 {
444  char *p;
445  int i, ret = 0;
446  char *frames_str1 = av_strdup(frames_str);
447  char *saveptr = NULL;
448 
449  if (!frames_str1)
450  return AVERROR(ENOMEM);
451 
452 #define FAIL(err) ret = err; goto end
453 
454  *nb_frames = 1;
455  for (p = frames_str1; *p; p++)
456  if (*p == ',')
457  (*nb_frames)++;
458 
459  *frames = av_malloc_array(*nb_frames, sizeof(**frames));
460  if (!*frames) {
461  av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
462  FAIL(AVERROR(ENOMEM));
463  }
464 
465  p = frames_str1;
466  for (i = 0; i < *nb_frames; i++) {
467  long int f;
468  char *tailptr;
469  char *fstr = av_strtok(p, ",", &saveptr);
470 
471  p = NULL;
472  if (!fstr) {
473  av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
474  frames_str);
475  FAIL(AVERROR(EINVAL));
476  }
477  f = strtol(fstr, &tailptr, 10);
478  if (*tailptr || f <= 0 || f >= INT_MAX) {
479  av_log(log_ctx, AV_LOG_ERROR,
480  "Invalid argument '%s', must be a positive integer <= INT64_MAX\n",
481  fstr);
482  FAIL(AVERROR(EINVAL));
483  }
484  (*frames)[i] = f;
485 
486  /* check on monotonicity */
487  if (i && (*frames)[i-1] > (*frames)[i]) {
488  av_log(log_ctx, AV_LOG_ERROR,
489  "Specified frame %d is greater than the following frame %d\n",
490  (*frames)[i], (*frames)[i-1]);
491  FAIL(AVERROR(EINVAL));
492  }
493  }
494 
495 end:
496  av_free(frames_str1);
497  return ret;
498 }
499 
500 static int open_null_ctx(AVIOContext **ctx)
501 {
502  int buf_size = 32768;
503  uint8_t *buf = av_malloc(buf_size);
504  if (!buf)
505  return AVERROR(ENOMEM);
506  *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
507  if (!*ctx) {
508  av_free(buf);
509  return AVERROR(ENOMEM);
510  }
511  return 0;
512 }
513 
514 static void close_null_ctxp(AVIOContext **pb)
515 {
516  av_freep(&(*pb)->buffer);
517  av_freep(pb);
518 }
519 
521 {
522  SegmentContext *seg = s->priv_data;
523  int ret, i;
524 
525  seg->reference_stream_index = -1;
526  if (!strcmp(seg->reference_stream_specifier, "auto")) {
527  /* select first index of type with highest priority */
528  int type_index_map[AVMEDIA_TYPE_NB];
529  static const enum AVMediaType type_priority_list[] = {
535  };
536  enum AVMediaType type;
537 
538  for (i = 0; i < AVMEDIA_TYPE_NB; i++)
539  type_index_map[i] = -1;
540 
541  /* select first index for each type */
542  for (i = 0; i < s->nb_streams; i++) {
543  type = s->streams[i]->codec->codec_type;
544  if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
545  /* ignore attached pictures/cover art streams */
547  type_index_map[type] = i;
548  }
549 
550  for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
551  type = type_priority_list[i];
552  if ((seg->reference_stream_index = type_index_map[type]) >= 0)
553  break;
554  }
555  } else {
556  for (i = 0; i < s->nb_streams; i++) {
559  if (ret < 0)
560  return ret;
561  if (ret > 0) {
562  seg->reference_stream_index = i;
563  break;
564  }
565  }
566  }
567 
568  if (seg->reference_stream_index < 0) {
569  av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
571  return AVERROR(EINVAL);
572  }
573 
574  return 0;
575 }
576 
578 {
579  avio_closep(&seg->list_pb);
581  seg->avf = NULL;
582 }
583 
585 {
586  SegmentContext *seg = s->priv_data;
587  AVFormatContext *oc = NULL;
588  AVDictionary *options = NULL;
589  int ret;
590  int i;
591 
592  seg->segment_count = 0;
593  if (!seg->write_header_trailer)
594  seg->individual_header_trailer = 0;
595 
596  if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
597  av_log(s, AV_LOG_ERROR,
598  "segment_time, segment_times, and segment_frames options "
599  "are mutually exclusive, select just one of them\n");
600  return AVERROR(EINVAL);
601  }
602 
603  if (seg->times_str) {
604  if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
605  return ret;
606  } else if (seg->frames_str) {
607  if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
608  return ret;
609  } else {
610  /* set default value if not specified */
611  if (!seg->time_str)
612  seg->time_str = av_strdup("2");
613  if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
614  av_log(s, AV_LOG_ERROR,
615  "Invalid time duration specification '%s' for segment_time option\n",
616  seg->time_str);
617  return ret;
618  }
619  }
620 
621  if (seg->format_options_str) {
622  ret = av_dict_parse_string(&seg->format_options, seg->format_options_str, "=", ":", 0);
623  if (ret < 0) {
624  av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n",
625  seg->format_options_str);
626  goto fail;
627  }
628  }
629 
630  if (seg->list) {
631  if (seg->list_type == LIST_TYPE_UNDEFINED) {
632  if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
633  else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
634  else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
635  else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
636  else seg->list_type = LIST_TYPE_FLAT;
637  }
638  if ((ret = segment_list_open(s)) < 0)
639  goto fail;
640  }
641  if (seg->list_type == LIST_TYPE_EXT)
642  av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
643 
644  if ((ret = select_reference_stream(s)) < 0)
645  goto fail;
646  av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
649 
650  seg->oformat = av_guess_format(seg->format, s->filename, NULL);
651 
652  if (!seg->oformat) {
654  goto fail;
655  }
656  if (seg->oformat->flags & AVFMT_NOFILE) {
657  av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
658  seg->oformat->name);
659  ret = AVERROR(EINVAL);
660  goto fail;
661  }
662 
663  if ((ret = segment_mux_init(s)) < 0)
664  goto fail;
665  oc = seg->avf;
666 
667  if ((ret = set_segment_filename(s)) < 0)
668  goto fail;
669 
670  if (seg->write_header_trailer) {
671  if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
672  &s->interrupt_callback, NULL)) < 0) {
673  av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
674  goto fail;
675  }
676  } else {
677  if ((ret = open_null_ctx(&oc->pb)) < 0)
678  goto fail;
679  }
680 
681  av_dict_copy(&options, seg->format_options, 0);
682  ret = avformat_write_header(oc, &options);
683  if (av_dict_count(options)) {
684  av_log(s, AV_LOG_ERROR,
685  "Some of the provided format options in '%s' are not recognized\n", seg->format_options_str);
686  ret = AVERROR(EINVAL);
687  goto fail;
688  }
689 
690  if (ret < 0) {
691  avio_closep(&oc->pb);
692  goto fail;
693  }
694  seg->segment_frame_count = 0;
695 
696  av_assert0(s->nb_streams == oc->nb_streams);
697  for (i = 0; i < s->nb_streams; i++) {
698  AVStream *inner_st = oc->streams[i];
699  AVStream *outer_st = s->streams[i];
700  avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
701  }
702 
703  if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
704  s->avoid_negative_ts = 1;
705 
706  if (!seg->write_header_trailer) {
707  close_null_ctxp(&oc->pb);
708  if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
709  &s->interrupt_callback, NULL)) < 0)
710  goto fail;
711  }
712 
713 fail:
714  av_dict_free(&options);
715  if (ret < 0)
716  seg_free_context(seg);
717 
718  return ret;
719 }
720 
722 {
723  SegmentContext *seg = s->priv_data;
724  AVStream *st = s->streams[pkt->stream_index];
725  int64_t end_pts = INT64_MAX, offset;
726  int start_frame = INT_MAX;
727  int ret;
728  struct tm ti;
729  int64_t usecs;
730  int64_t wrapped_val;
731 
732  if (!seg->avf)
733  return AVERROR(EINVAL);
734 
735  if (seg->times) {
736  end_pts = seg->segment_count < seg->nb_times ?
737  seg->times[seg->segment_count] : INT64_MAX;
738  } else if (seg->frames) {
739  start_frame = seg->segment_count < seg->nb_frames ?
740  seg->frames[seg->segment_count] : INT_MAX;
741  } else {
742  if (seg->use_clocktime) {
743  int64_t avgt = av_gettime();
744  time_t sec = avgt / 1000000;
745  localtime_r(&sec, &ti);
746  usecs = (int64_t)(ti.tm_hour*3600 + ti.tm_min*60 + ti.tm_sec) * 1000000 + (avgt % 1000000);
747  wrapped_val = usecs % seg->time;
748  if (seg->last_cut != usecs && wrapped_val < seg->last_val) {
749  seg->cut_pending = 1;
750  seg->last_cut = usecs;
751  }
752  seg->last_val = wrapped_val;
753  } else {
754  end_pts = seg->time * (seg->segment_count+1);
755  }
756  }
757 
758  av_dlog(s, "packet stream:%d pts:%s pts_time:%s duration_time:%s is_key:%d frame:%d\n",
759  pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
760  av_ts2timestr(pkt->duration, &st->time_base),
761  pkt->flags & AV_PKT_FLAG_KEY,
762  pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
763 
764  if (pkt->stream_index == seg->reference_stream_index &&
765  pkt->flags & AV_PKT_FLAG_KEY &&
766  seg->segment_frame_count > 0 &&
767  (seg->cut_pending || seg->frame_count >= start_frame ||
768  (pkt->pts != AV_NOPTS_VALUE &&
769  av_compare_ts(pkt->pts, st->time_base,
770  end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
771  /* sanitize end time in case last packet didn't have a defined duration */
772  if (seg->cur_entry.last_duration == 0)
773  seg->cur_entry.end_time = (double)pkt->pts * av_q2d(st->time_base);
774 
775  if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
776  goto fail;
777 
778  if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
779  goto fail;
780 
781  seg->cut_pending = 0;
783  seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
785  seg->cur_entry.end_time = seg->cur_entry.start_time +
786  pkt->pts != AV_NOPTS_VALUE ? (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base) : 0;
787  } else if (pkt->pts != AV_NOPTS_VALUE && pkt->stream_index == seg->reference_stream_index) {
788  seg->cur_entry.end_time =
789  FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
790  seg->cur_entry.last_duration = pkt->duration;
791  }
792 
793  if (seg->segment_frame_count == 0) {
794  av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
795  seg->avf->filename, pkt->stream_index,
796  av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
797  }
798 
799  av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
800  pkt->stream_index,
802  av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
803  av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
804 
805  /* compute new timestamps */
806  offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
808  if (pkt->pts != AV_NOPTS_VALUE)
809  pkt->pts += offset;
810  if (pkt->dts != AV_NOPTS_VALUE)
811  pkt->dts += offset;
812 
813  av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
814  av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
815  av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
816 
817  ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s, seg->initial_offset || seg->reset_timestamps);
818 
819 fail:
820  if (pkt->stream_index == seg->reference_stream_index) {
821  seg->frame_count++;
822  seg->segment_frame_count++;
823  }
824 
825  if (ret < 0)
826  seg_free_context(seg);
827 
828  return ret;
829 }
830 
832 {
833  SegmentContext *seg = s->priv_data;
834  AVFormatContext *oc = seg->avf;
835  SegmentListEntry *cur, *next;
836  int ret = 0;
837 
838  if (!oc)
839  goto fail;
840 
841  if (!seg->write_header_trailer) {
842  if ((ret = segment_end(s, 0, 1)) < 0)
843  goto fail;
844  open_null_ctx(&oc->pb);
845  ret = av_write_trailer(oc);
846  close_null_ctxp(&oc->pb);
847  } else {
848  ret = segment_end(s, 1, 1);
849  }
850 fail:
851  if (seg->list)
852  avio_closep(&seg->list_pb);
853 
855  av_opt_free(seg);
856  av_freep(&seg->times);
857  av_freep(&seg->frames);
858 
859  cur = seg->segment_list_entries;
860  while (cur) {
861  next = cur->next;
862  av_freep(&cur->filename);
863  av_free(cur);
864  cur = next;
865  }
866 
868  seg->avf = NULL;
869  return ret;
870 }
871 
872 #define OFFSET(x) offsetof(SegmentContext, x)
873 #define E AV_OPT_FLAG_ENCODING_PARAM
874 static const AVOption options[] = {
875  { "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E },
876  { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
877  { "segment_format_options", "set list of options for the container format used for the segments", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
878  { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
879 
880  { "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"},
881  { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},
882  { "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"},
883 
884  { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
885 
886  { "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" },
887  { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
888  { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" },
889  { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" },
890  { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
891  { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
892  { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
893 
894  { "segment_atclocktime", "set segment to be cut at clocktime", OFFSET(use_clocktime), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E},
895  { "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
896  { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 0, E },
897  { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
898  { "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
899  { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
900  { "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
901  { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
902  { "segment_wrap_number", "set the number of wrap before the first segment", OFFSET(segment_idx_wrap_nb), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
903  { "strftime", "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, E },
904 
905  { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
906  { "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 },
907  { "reset_timestamps", "reset timestamps at the begin of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
908  { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
909  { NULL },
910 };
911 
912 static const AVClass seg_class = {
913  .class_name = "segment muxer",
914  .item_name = av_default_item_name,
915  .option = options,
916  .version = LIBAVUTIL_VERSION_INT,
917 };
918 
920  .name = "segment",
921  .long_name = NULL_IF_CONFIG_SMALL("segment"),
922  .priv_data_size = sizeof(SegmentContext),
927  .priv_class = &seg_class,
928 };
929 
930 static const AVClass sseg_class = {
931  .class_name = "stream_segment muxer",
932  .item_name = av_default_item_name,
933  .option = options,
934  .version = LIBAVUTIL_VERSION_INT,
935 };
936 
938  .name = "stream_segment,ssegment",
939  .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
940  .priv_data_size = sizeof(SegmentContext),
941  .flags = AVFMT_NOFILE,
945  .priv_class = &sseg_class,
946 };