2 * Copyright (c) 2011, Luca Barbato
4 * This file is part of FFmpeg.
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.
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.
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
22 * @file generic segmenter
23 * M3U8 specification can be find here:
24 * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}
31 #include "avio_internal.h"
34 #include "libavutil/avassert.h"
35 #include "libavutil/internal.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"
42 #include "libavutil/timecode.h"
43 #include "libavutil/time_internal.h"
44 #include "libavutil/timestamp.h"
46 typedef struct SegmentListEntry {
48 double start_time, end_time;
52 struct SegmentListEntry *next;
53 int64_t last_duration;
57 LIST_TYPE_UNDEFINED = -1,
61 LIST_TYPE_EXT, ///< deprecated
66 #define SEGMENT_LIST_FLAG_CACHE 1
67 #define SEGMENT_LIST_FLAG_LIVE 2
69 typedef struct SegmentContext {
70 const AVClass *class; /**< Class for private options. */
71 int segment_idx; ///< index of the segment file to write, starting from 0
72 int segment_idx_wrap; ///< number after which the index wraps
73 int segment_idx_wrap_nb; ///< number of time the index has wraped
74 int segment_count; ///< number of segment files already written
75 AVOutputFormat *oformat;
77 char *format; ///< format to use for output segment files
78 char *format_options_str; ///< format options to use for output segment files
79 AVDictionary *format_options;
80 char *list; ///< filename for the segment list file
81 int list_flags; ///< flags affecting list generation
82 int list_size; ///< number of entries for the segment list file
84 int use_clocktime; ///< flag to cut segments at regular clock time
85 int64_t clocktime_offset; //< clock offset for cutting the segments at regular clock time
86 int64_t clocktime_wrap_duration; //< wrapping duration considered for starting a new segment
87 int64_t last_val; ///< remember last time for wrap around detection
89 int header_written; ///< whether we've already called avformat_write_header
91 char *entry_prefix; ///< prefix to add to list entry filenames
92 int list_type; ///< set the list type
93 AVIOContext *list_pb; ///< list file put-byte context
94 char *time_str; ///< segment duration specification string
95 int64_t time; ///< segment duration
96 int use_strftime; ///< flag to expand filename with strftime
97 int increment_tc; ///< flag to increment timecode if found
99 char *times_str; ///< segment times specification string
100 int64_t *times; ///< list of segment interval specification
101 int nb_times; ///< number of elments in the times array
103 char *frames_str; ///< segment frame numbers specification string
104 int *frames; ///< list of frame number specification
105 int nb_frames; ///< number of elments in the frames array
106 int frame_count; ///< total number of reference frames
107 int segment_frame_count; ///< number of reference frames in the segment
110 int individual_header_trailer; /**< Set by a private option. */
111 int write_header_trailer; /**< Set by a private option. */
112 char *header_filename; ///< filename to write the output header to
114 int reset_timestamps; ///< reset timestamps at the beginning of each segment
115 int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds
116 char *reference_stream_specifier; ///< reference stream specifier
117 int reference_stream_index;
118 int break_non_keyframes;
122 char temp_list_filename[1024];
124 SegmentListEntry cur_entry;
125 SegmentListEntry *segment_list_entries;
126 SegmentListEntry *segment_list_entries_end;
129 static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
131 int needs_quoting = !!str[strcspn(str, "\",\n\r")];
136 for (; *str; str++) {
145 static int segment_mux_init(AVFormatContext *s)
147 SegmentContext *seg = s->priv_data;
152 ret = avformat_alloc_output_context2(&seg->avf, seg->oformat, NULL, NULL);
157 oc->interrupt_callback = s->interrupt_callback;
158 oc->max_delay = s->max_delay;
159 av_dict_copy(&oc->metadata, s->metadata, 0);
160 oc->opaque = s->opaque;
161 oc->io_close = s->io_close;
162 oc->io_open = s->io_open;
163 oc->flags = s->flags;
165 for (i = 0; i < s->nb_streams; i++) {
167 AVCodecParameters *ipar, *opar;
169 if (!(st = avformat_new_stream(oc, NULL)))
170 return AVERROR(ENOMEM);
171 ipar = s->streams[i]->codecpar;
173 avcodec_parameters_copy(opar, ipar);
174 if (!oc->oformat->codec_tag ||
175 av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
176 av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
177 opar->codec_tag = ipar->codec_tag;
181 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
182 st->time_base = s->streams[i]->time_base;
183 av_dict_copy(&st->metadata, s->streams[i]->metadata, 0);
189 static int set_segment_filename(AVFormatContext *s)
191 SegmentContext *seg = s->priv_data;
192 AVFormatContext *oc = seg->avf;
196 if (seg->segment_idx_wrap)
197 seg->segment_idx %= seg->segment_idx_wrap;
198 if (seg->use_strftime) {
200 struct tm *tm, tmpbuf;
202 tm = localtime_r(&now0, &tmpbuf);
203 if (!strftime(oc->filename, sizeof(oc->filename), s->filename, tm)) {
204 av_log(oc, AV_LOG_ERROR, "Could not get segment filename with strftime\n");
205 return AVERROR(EINVAL);
207 } else if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
208 s->filename, seg->segment_idx) < 0) {
209 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
210 return AVERROR(EINVAL);
213 /* copy modified name in list entry */
214 size = strlen(av_basename(oc->filename)) + 1;
215 if (seg->entry_prefix)
216 size += strlen(seg->entry_prefix);
218 if ((ret = av_reallocp(&seg->cur_entry.filename, size)) < 0)
220 snprintf(seg->cur_entry.filename, size, "%s%s",
221 seg->entry_prefix ? seg->entry_prefix : "",
222 av_basename(oc->filename));
227 static int segment_start(AVFormatContext *s, int write_header)
229 SegmentContext *seg = s->priv_data;
230 AVFormatContext *oc = seg->avf;
234 avformat_free_context(oc);
236 if ((err = segment_mux_init(s)) < 0)
242 if ((seg->segment_idx_wrap) && (seg->segment_idx % seg->segment_idx_wrap == 0))
243 seg->segment_idx_wrap_nb++;
245 if ((err = set_segment_filename(s)) < 0)
248 if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0) {
249 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
252 if (!seg->individual_header_trailer)
253 oc->pb->seekable = 0;
255 if (oc->oformat->priv_class && oc->priv_data)
256 av_opt_set(oc->priv_data, "mpegts_flags", "+resend_headers", 0);
259 AVDictionary *options = NULL;
260 av_dict_copy(&options, seg->format_options, 0);
261 av_dict_set(&options, "fflags", "-autobsf", 0);
262 err = avformat_write_header(oc, &options);
263 av_dict_free(&options);
268 seg->segment_frame_count = 0;
272 static int segment_list_open(AVFormatContext *s)
274 SegmentContext *seg = s->priv_data;
277 snprintf(seg->temp_list_filename, sizeof(seg->temp_list_filename), seg->use_rename ? "%s.tmp" : "%s", seg->list);
278 ret = s->io_open(s, &seg->list_pb, seg->temp_list_filename, AVIO_FLAG_WRITE, NULL);
280 av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list);
284 if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
285 SegmentListEntry *entry;
286 double max_duration = 0;
288 avio_printf(seg->list_pb, "#EXTM3U\n");
289 avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
290 avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
291 avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
292 seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
294 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
295 seg->segment_list_entries->index);
297 for (entry = seg->segment_list_entries; entry; entry = entry->next)
298 max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
299 avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
300 } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
301 avio_printf(seg->list_pb, "ffconcat version 1.0\n");
307 static void segment_list_print_entry(AVIOContext *list_ioctx,
309 const SegmentListEntry *list_entry,
314 avio_printf(list_ioctx, "%s\n", list_entry->filename);
318 print_csv_escaped_str(list_ioctx, list_entry->filename);
319 avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
322 avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
323 list_entry->end_time - list_entry->start_time, list_entry->filename);
325 case LIST_TYPE_FFCONCAT:
328 if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
329 av_log(log_ctx, AV_LOG_WARNING,
330 "Error writing list entry '%s' in list file\n", list_entry->filename);
333 avio_printf(list_ioctx, "file %s\n", buf);
338 av_assert0(!"Invalid list type");
342 static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
344 SegmentContext *seg = s->priv_data;
345 AVFormatContext *oc = seg->avf;
349 AVDictionaryEntry *tcr;
350 char buf[AV_TIMECODE_STR_SIZE];
355 return AVERROR(EINVAL);
357 av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
359 ret = av_write_trailer(oc);
362 av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
366 if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
367 SegmentListEntry *entry = av_mallocz(sizeof(*entry));
369 ret = AVERROR(ENOMEM);
373 /* append new element */
374 memcpy(entry, &seg->cur_entry, sizeof(*entry));
375 entry->filename = av_strdup(entry->filename);
376 if (!seg->segment_list_entries)
377 seg->segment_list_entries = seg->segment_list_entries_end = entry;
379 seg->segment_list_entries_end->next = entry;
380 seg->segment_list_entries_end = entry;
382 /* drop first item */
383 if (seg->list_size && seg->segment_count >= seg->list_size) {
384 entry = seg->segment_list_entries;
385 seg->segment_list_entries = seg->segment_list_entries->next;
386 av_freep(&entry->filename);
390 if ((ret = segment_list_open(s)) < 0)
392 for (entry = seg->segment_list_entries; entry; entry = entry->next)
393 segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
394 if (seg->list_type == LIST_TYPE_M3U8 && is_last)
395 avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
396 ff_format_io_close(s, &seg->list_pb);
398 ff_rename(seg->temp_list_filename, seg->list, s);
400 segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
401 avio_flush(seg->list_pb);
405 av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
406 seg->avf->filename, seg->segment_count);
407 seg->segment_count++;
409 if (seg->increment_tc) {
410 tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
412 /* search the first video stream */
413 for (i = 0; i < s->nb_streams; i++) {
414 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
415 rate = s->streams[i]->avg_frame_rate;/* Get fps from the video stream */
416 err = av_timecode_init_from_string(&tc, rate, tcr->value, s);
418 av_log(s, AV_LOG_WARNING, "Could not increment timecode, error occurred during timecode creation.");
421 tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(rate));/* increment timecode */
422 av_dict_set(&s->metadata, "timecode",
423 av_timecode_make_string(&tc, buf, 0), 0);
428 av_log(s, AV_LOG_WARNING, "Could not increment timecode, no timecode metadata found");
433 ff_format_io_close(oc, &oc->pb);
438 static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
439 const char *times_str)
443 char *times_str1 = av_strdup(times_str);
444 char *saveptr = NULL;
447 return AVERROR(ENOMEM);
449 #define FAIL(err) ret = err; goto end
452 for (p = times_str1; *p; p++)
456 *times = av_malloc_array(*nb_times, sizeof(**times));
458 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
459 FAIL(AVERROR(ENOMEM));
463 for (i = 0; i < *nb_times; i++) {
465 char *tstr = av_strtok(p, ",", &saveptr);
468 if (!tstr || !tstr[0]) {
469 av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
471 FAIL(AVERROR(EINVAL));
474 ret = av_parse_time(&t, tstr, 1);
476 av_log(log_ctx, AV_LOG_ERROR,
477 "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
478 FAIL(AVERROR(EINVAL));
482 /* check on monotonicity */
483 if (i && (*times)[i-1] > (*times)[i]) {
484 av_log(log_ctx, AV_LOG_ERROR,
485 "Specified time %f is greater than the following time %f\n",
486 (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
487 FAIL(AVERROR(EINVAL));
496 static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
497 const char *frames_str)
501 char *frames_str1 = av_strdup(frames_str);
502 char *saveptr = NULL;
505 return AVERROR(ENOMEM);
507 #define FAIL(err) ret = err; goto end
510 for (p = frames_str1; *p; p++)
514 *frames = av_malloc_array(*nb_frames, sizeof(**frames));
516 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
517 FAIL(AVERROR(ENOMEM));
521 for (i = 0; i < *nb_frames; i++) {
524 char *fstr = av_strtok(p, ",", &saveptr);
528 av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
530 FAIL(AVERROR(EINVAL));
532 f = strtol(fstr, &tailptr, 10);
533 if (*tailptr || f <= 0 || f >= INT_MAX) {
534 av_log(log_ctx, AV_LOG_ERROR,
535 "Invalid argument '%s', must be a positive integer <= INT64_MAX\n",
537 FAIL(AVERROR(EINVAL));
541 /* check on monotonicity */
542 if (i && (*frames)[i-1] > (*frames)[i]) {
543 av_log(log_ctx, AV_LOG_ERROR,
544 "Specified frame %d is greater than the following frame %d\n",
545 (*frames)[i], (*frames)[i-1]);
546 FAIL(AVERROR(EINVAL));
551 av_free(frames_str1);
555 static int open_null_ctx(AVIOContext **ctx)
557 int buf_size = 32768;
558 uint8_t *buf = av_malloc(buf_size);
560 return AVERROR(ENOMEM);
561 *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
564 return AVERROR(ENOMEM);
569 static void close_null_ctxp(AVIOContext **pb)
571 av_freep(&(*pb)->buffer);
572 avio_context_free(pb);
575 static int select_reference_stream(AVFormatContext *s)
577 SegmentContext *seg = s->priv_data;
580 seg->reference_stream_index = -1;
581 if (!strcmp(seg->reference_stream_specifier, "auto")) {
582 /* select first index of type with highest priority */
583 int type_index_map[AVMEDIA_TYPE_NB];
584 static const enum AVMediaType type_priority_list[] = {
587 AVMEDIA_TYPE_SUBTITLE,
589 AVMEDIA_TYPE_ATTACHMENT
591 enum AVMediaType type;
593 for (i = 0; i < AVMEDIA_TYPE_NB; i++)
594 type_index_map[i] = -1;
596 /* select first index for each type */
597 for (i = 0; i < s->nb_streams; i++) {
598 type = s->streams[i]->codecpar->codec_type;
599 if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
600 /* ignore attached pictures/cover art streams */
601 && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))
602 type_index_map[type] = i;
605 for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
606 type = type_priority_list[i];
607 if ((seg->reference_stream_index = type_index_map[type]) >= 0)
611 for (i = 0; i < s->nb_streams; i++) {
612 ret = avformat_match_stream_specifier(s, s->streams[i],
613 seg->reference_stream_specifier);
617 seg->reference_stream_index = i;
623 if (seg->reference_stream_index < 0) {
624 av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
625 seg->reference_stream_specifier);
626 return AVERROR(EINVAL);
632 static void seg_free(AVFormatContext *s)
634 SegmentContext *seg = s->priv_data;
635 ff_format_io_close(seg->avf, &seg->list_pb);
636 avformat_free_context(seg->avf);
640 static int seg_init(AVFormatContext *s)
642 SegmentContext *seg = s->priv_data;
643 AVFormatContext *oc = seg->avf;
644 AVDictionary *options = NULL;
648 seg->segment_count = 0;
649 if (!seg->write_header_trailer)
650 seg->individual_header_trailer = 0;
652 if (seg->header_filename) {
653 seg->write_header_trailer = 1;
654 seg->individual_header_trailer = 0;
657 if (seg->initial_offset > 0) {
658 av_log(s, AV_LOG_WARNING, "NOTE: the option initial_offset is deprecated,"
659 "you can use output_ts_offset instead of it\n");
662 if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
663 av_log(s, AV_LOG_ERROR,
664 "segment_time, segment_times, and segment_frames options "
665 "are mutually exclusive, select just one of them\n");
666 return AVERROR(EINVAL);
669 if (seg->times_str) {
670 if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
672 } else if (seg->frames_str) {
673 if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
676 /* set default value if not specified */
678 seg->time_str = av_strdup("2");
679 if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
680 av_log(s, AV_LOG_ERROR,
681 "Invalid time duration specification '%s' for segment_time option\n",
685 if (seg->use_clocktime) {
686 if (seg->time <= 0) {
687 av_log(s, AV_LOG_ERROR, "Invalid negative segment_time with segment_atclocktime option set\n");
688 return AVERROR(EINVAL);
690 seg->clocktime_offset = seg->time - (seg->clocktime_offset % seg->time);
694 if (seg->format_options_str) {
695 ret = av_dict_parse_string(&seg->format_options, seg->format_options_str, "=", ":", 0);
697 av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n",
698 seg->format_options_str);
704 if (seg->list_type == LIST_TYPE_UNDEFINED) {
705 if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
706 else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
707 else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
708 else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
709 else seg->list_type = LIST_TYPE_FLAT;
711 if (!seg->list_size && seg->list_type != LIST_TYPE_M3U8) {
712 if ((ret = segment_list_open(s)) < 0)
715 const char *proto = avio_find_protocol_name(seg->list);
716 seg->use_rename = proto && !strcmp(proto, "file");
720 if (seg->list_type == LIST_TYPE_EXT)
721 av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
723 if ((ret = select_reference_stream(s)) < 0)
725 av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
726 seg->reference_stream_index,
727 av_get_media_type_string(s->streams[seg->reference_stream_index]->codecpar->codec_type));
729 seg->oformat = av_guess_format(seg->format, s->filename, NULL);
732 return AVERROR_MUXER_NOT_FOUND;
733 if (seg->oformat->flags & AVFMT_NOFILE) {
734 av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
736 return AVERROR(EINVAL);
739 if ((ret = segment_mux_init(s)) < 0)
742 if ((ret = set_segment_filename(s)) < 0)
746 if (seg->write_header_trailer) {
747 if ((ret = s->io_open(s, &oc->pb,
748 seg->header_filename ? seg->header_filename : oc->filename,
749 AVIO_FLAG_WRITE, NULL)) < 0) {
750 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
753 if (!seg->individual_header_trailer)
754 oc->pb->seekable = 0;
756 if ((ret = open_null_ctx(&oc->pb)) < 0)
760 av_dict_copy(&options, seg->format_options, 0);
761 av_dict_set(&options, "fflags", "-autobsf", 0);
762 ret = avformat_init_output(oc, &options);
763 if (av_dict_count(options)) {
764 av_log(s, AV_LOG_ERROR,
765 "Some of the provided format options in '%s' are not recognized\n", seg->format_options_str);
766 av_dict_free(&options);
767 return AVERROR(EINVAL);
769 av_dict_free(&options);
772 ff_format_io_close(oc, &oc->pb);
775 seg->segment_frame_count = 0;
777 av_assert0(s->nb_streams == oc->nb_streams);
778 if (ret == AVSTREAM_INIT_IN_WRITE_HEADER) {
779 ret = avformat_write_header(oc, NULL);
782 seg->header_written = 1;
785 for (i = 0; i < s->nb_streams; i++) {
786 AVStream *inner_st = oc->streams[i];
787 AVStream *outer_st = s->streams[i];
788 avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
791 if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
792 s->avoid_negative_ts = 1;
797 static int seg_write_header(AVFormatContext *s)
799 SegmentContext *seg = s->priv_data;
800 AVFormatContext *oc = seg->avf;
803 if (!seg->header_written) {
804 for (i = 0; i < s->nb_streams; i++) {
805 AVStream *st = oc->streams[i];
806 AVCodecParameters *ipar, *opar;
808 ipar = s->streams[i]->codecpar;
809 opar = oc->streams[i]->codecpar;
810 avcodec_parameters_copy(opar, ipar);
811 if (!oc->oformat->codec_tag ||
812 av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
813 av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
814 opar->codec_tag = ipar->codec_tag;
818 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
819 st->time_base = s->streams[i]->time_base;
821 ret = avformat_write_header(oc, NULL);
826 if (!seg->write_header_trailer || seg->header_filename) {
827 if (seg->header_filename) {
828 av_write_frame(oc, NULL);
829 ff_format_io_close(oc, &oc->pb);
831 close_null_ctxp(&oc->pb);
833 if ((ret = oc->io_open(oc, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
835 if (!seg->individual_header_trailer)
836 oc->pb->seekable = 0;
842 static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
844 SegmentContext *seg = s->priv_data;
845 AVStream *st = s->streams[pkt->stream_index];
846 int64_t end_pts = INT64_MAX, offset;
847 int start_frame = INT_MAX;
853 if (!seg->avf || !seg->avf->pb)
854 return AVERROR(EINVAL);
858 end_pts = seg->segment_count < seg->nb_times ?
859 seg->times[seg->segment_count] : INT64_MAX;
860 } else if (seg->frames) {
861 start_frame = seg->segment_count < seg->nb_frames ?
862 seg->frames[seg->segment_count] : INT_MAX;
864 if (seg->use_clocktime) {
865 int64_t avgt = av_gettime();
866 time_t sec = avgt / 1000000;
867 localtime_r(&sec, &ti);
868 usecs = (int64_t)(ti.tm_hour * 3600 + ti.tm_min * 60 + ti.tm_sec) * 1000000 + (avgt % 1000000);
869 wrapped_val = (usecs + seg->clocktime_offset) % seg->time;
870 if (wrapped_val < seg->last_val && wrapped_val < seg->clocktime_wrap_duration)
871 seg->cut_pending = 1;
872 seg->last_val = wrapped_val;
874 end_pts = seg->time * (seg->segment_count + 1);
878 ff_dlog(s, "packet stream:%d pts:%s pts_time:%s duration_time:%s is_key:%d frame:%d\n",
879 pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
880 av_ts2timestr(pkt->duration, &st->time_base),
881 pkt->flags & AV_PKT_FLAG_KEY,
882 pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
884 if (pkt->stream_index == seg->reference_stream_index &&
885 (pkt->flags & AV_PKT_FLAG_KEY || seg->break_non_keyframes) &&
886 (seg->segment_frame_count > 0 || seg->write_empty) &&
887 (seg->cut_pending || seg->frame_count >= start_frame ||
888 (pkt->pts != AV_NOPTS_VALUE &&
889 av_compare_ts(pkt->pts, st->time_base,
890 end_pts - seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
891 /* sanitize end time in case last packet didn't have a defined duration */
892 if (seg->cur_entry.last_duration == 0)
893 seg->cur_entry.end_time = (double)pkt->pts * av_q2d(st->time_base);
895 if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
898 if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
901 seg->cut_pending = 0;
902 seg->cur_entry.index = seg->segment_idx + seg->segment_idx_wrap * seg->segment_idx_wrap_nb;
903 seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
904 seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
905 seg->cur_entry.end_time = seg->cur_entry.start_time;
907 if (seg->times || (!seg->frames && !seg->use_clocktime) && seg->write_empty)
911 if (pkt->stream_index == seg->reference_stream_index) {
912 if (pkt->pts != AV_NOPTS_VALUE)
913 seg->cur_entry.end_time =
914 FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
915 seg->cur_entry.last_duration = pkt->duration;
918 if (seg->segment_frame_count == 0) {
919 av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
920 seg->avf->filename, pkt->stream_index,
921 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
924 av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
926 av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),
927 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
928 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
930 /* compute new timestamps */
931 offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
932 AV_TIME_BASE_Q, st->time_base);
933 if (pkt->pts != AV_NOPTS_VALUE)
935 if (pkt->dts != AV_NOPTS_VALUE)
938 av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
939 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
940 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
942 ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s, seg->initial_offset || seg->reset_timestamps);
945 if (pkt->stream_index == seg->reference_stream_index) {
947 seg->segment_frame_count++;
953 static int seg_write_trailer(struct AVFormatContext *s)
955 SegmentContext *seg = s->priv_data;
956 AVFormatContext *oc = seg->avf;
957 SegmentListEntry *cur, *next;
963 if (!seg->write_header_trailer) {
964 if ((ret = segment_end(s, 0, 1)) < 0)
966 if ((ret = open_null_ctx(&oc->pb)) < 0)
968 ret = av_write_trailer(oc);
969 close_null_ctxp(&oc->pb);
971 ret = segment_end(s, 1, 1);
975 ff_format_io_close(s, &seg->list_pb);
977 av_dict_free(&seg->format_options);
979 av_freep(&seg->times);
980 av_freep(&seg->frames);
981 av_freep(&seg->cur_entry.filename);
983 cur = seg->segment_list_entries;
986 av_freep(&cur->filename);
991 avformat_free_context(oc);
996 static int seg_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
998 SegmentContext *seg = s->priv_data;
999 AVFormatContext *oc = seg->avf;
1000 if (oc->oformat->check_bitstream) {
1001 int ret = oc->oformat->check_bitstream(oc, pkt);
1003 AVStream *st = s->streams[pkt->stream_index];
1004 AVStream *ost = oc->streams[pkt->stream_index];
1005 st->internal->bsfcs = ost->internal->bsfcs;
1006 st->internal->nb_bsfcs = ost->internal->nb_bsfcs;
1007 ost->internal->bsfcs = NULL;
1008 ost->internal->nb_bsfcs = 0;
1015 #define OFFSET(x) offsetof(SegmentContext, x)
1016 #define E AV_OPT_FLAG_ENCODING_PARAM
1017 static const AVOption options[] = {
1018 { "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E },
1019 { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1020 { "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 },
1021 { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1022 { "segment_header_filename", "write a single file containing the header", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1024 { "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"},
1025 { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},
1026 { "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"},
1028 { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1030 { "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" },
1031 { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
1032 { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" },
1033 { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" },
1034 { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
1035 { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1036 { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1038 { "segment_atclocktime", "set segment to be cut at clocktime", OFFSET(use_clocktime), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E},
1039 { "segment_clocktime_offset", "set segment clocktime offset", OFFSET(clocktime_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 86400000000LL, E},
1040 { "segment_clocktime_wrap_duration", "set segment clocktime wrapping duration", OFFSET(clocktime_wrap_duration), AV_OPT_TYPE_DURATION, {.i64 = INT64_MAX}, 0, INT64_MAX, E},
1041 { "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1042 { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 0, E },
1043 { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
1044 { "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
1045 { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1046 { "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1047 { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1048 { "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 },
1049 { "strftime", "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1050 { "increment_tc", "increment timecode between each segment", OFFSET(increment_tc), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1051 { "break_non_keyframes", "allow breaking segments on non-keyframes", OFFSET(break_non_keyframes), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1053 { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1054 { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1055 { "reset_timestamps", "reset timestamps at the beginning of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1056 { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
1057 { "write_empty_segments", "allow writing empty 'filler' segments", OFFSET(write_empty), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1061 static const AVClass seg_class = {
1062 .class_name = "segment muxer",
1063 .item_name = av_default_item_name,
1065 .version = LIBAVUTIL_VERSION_INT,
1068 AVOutputFormat ff_segment_muxer = {
1070 .long_name = NULL_IF_CONFIG_SMALL("segment"),
1071 .priv_data_size = sizeof(SegmentContext),
1072 .flags = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
1074 .write_header = seg_write_header,
1075 .write_packet = seg_write_packet,
1076 .write_trailer = seg_write_trailer,
1078 .check_bitstream = seg_check_bitstream,
1079 .priv_class = &seg_class,
1082 static const AVClass sseg_class = {
1083 .class_name = "stream_segment muxer",
1084 .item_name = av_default_item_name,
1086 .version = LIBAVUTIL_VERSION_INT,
1089 AVOutputFormat ff_stream_segment_muxer = {
1090 .name = "stream_segment,ssegment",
1091 .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
1092 .priv_data_size = sizeof(SegmentContext),
1093 .flags = AVFMT_NOFILE,
1095 .write_header = seg_write_header,
1096 .write_packet = seg_write_packet,
1097 .write_trailer = seg_write_trailer,
1099 .check_bitstream = seg_check_bitstream,
1100 .priv_class = &sseg_class,