2 * MPEG-DASH ISO BMFF segmenter
3 * Copyright (c) 2014 Martin Storsjo
4 * Copyright (c) 2018 Akamai Technologies, Inc.
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "libavutil/avassert.h"
29 #include "libavutil/avutil.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/rational.h"
35 #include "libavutil/time_internal.h"
39 #include "avio_internal.h"
40 #include "hlsplaylist.h"
41 #if CONFIG_HTTP_PROTOCOL
46 #include "os_support.h"
50 typedef struct Segment {
53 int range_length, index_length;
59 typedef struct AdaptationSet {
61 enum AVMediaType media_type;
62 AVDictionary *metadata;
63 AVRational min_frame_rate, max_frame_rate;
64 int ambiguous_frame_rate;
67 typedef struct OutputStream {
69 int ctx_inited, as_idx;
74 int64_t init_start_pos, pos;
75 int init_range_length;
76 int nb_segments, segments_size, segment_index;
78 int64_t first_pts, start_pts, max_pts;
81 char bandwidth_str[64];
86 typedef struct DASHContext {
87 const AVClass *class; /* Class for private options. */
88 char *adaptation_sets;
92 int extra_window_size;
98 OutputStream *streams;
100 int64_t last_duration;
101 int64_t total_duration;
102 char availability_start_time[100];
104 const char *single_file_name;
105 const char *init_seg_name;
106 const char *media_seg_name;
107 const char *utc_timing_url;
108 const char *user_agent;
111 int master_playlist_created;
112 AVIOContext *mpd_out;
113 AVIOContext *m3u8_out;
116 static struct codec_string {
120 { AV_CODEC_ID_VP8, "vp8" },
121 { AV_CODEC_ID_VP9, "vp9" },
122 { AV_CODEC_ID_VORBIS, "vorbis" },
123 { AV_CODEC_ID_OPUS, "opus" },
127 static int dashenc_io_open(AVFormatContext *s, AVIOContext **pb, char *filename,
128 AVDictionary **options) {
129 DASHContext *c = s->priv_data;
130 int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
131 int err = AVERROR_MUXER_NOT_FOUND;
132 if (!*pb || !http_base_proto || !c->http_persistent) {
133 err = s->io_open(s, pb, filename, AVIO_FLAG_WRITE, options);
134 #if CONFIG_HTTP_PROTOCOL
136 URLContext *http_url_context = ffio_geturlcontext(*pb);
137 av_assert0(http_url_context);
138 err = ff_http_do_new_request(http_url_context, filename);
144 static void dashenc_io_close(AVFormatContext *s, AVIOContext **pb, char *filename) {
145 DASHContext *c = s->priv_data;
146 int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
148 if (!http_base_proto || !c->http_persistent) {
149 ff_format_io_close(s, pb);
150 #if CONFIG_HTTP_PROTOCOL
157 static void set_codec_str(AVFormatContext *s, AVCodecParameters *par,
160 const AVCodecTag *tags[2] = { NULL, NULL };
164 // common Webm codecs are not part of RFC 6381
165 for (i = 0; codecs[i].id; i++)
166 if (codecs[i].id == par->codec_id) {
167 av_strlcpy(str, codecs[i].str, size);
171 // for codecs part of RFC 6381
172 if (par->codec_type == AVMEDIA_TYPE_VIDEO)
173 tags[0] = ff_codec_movvideo_tags;
174 else if (par->codec_type == AVMEDIA_TYPE_AUDIO)
175 tags[0] = ff_codec_movaudio_tags;
179 tag = av_codec_get_tag(tags, par->codec_id);
187 if (!strcmp(str, "mp4a") || !strcmp(str, "mp4v")) {
189 tags[0] = ff_mp4_obj_type;
190 oti = av_codec_get_tag(tags, par->codec_id);
192 av_strlcatf(str, size, ".%02"PRIx32, oti);
196 if (tag == MKTAG('m', 'p', '4', 'a')) {
197 if (par->extradata_size >= 2) {
198 int aot = par->extradata[0] >> 3;
200 aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;
201 av_strlcatf(str, size, ".%d", aot);
203 } else if (tag == MKTAG('m', 'p', '4', 'v')) {
204 // Unimplemented, should output ProfileLevelIndication as a decimal number
205 av_log(s, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");
207 } else if (!strcmp(str, "avc1")) {
208 uint8_t *tmpbuf = NULL;
209 uint8_t *extradata = par->extradata;
210 int extradata_size = par->extradata_size;
213 if (extradata[0] != 1) {
215 if (avio_open_dyn_buf(&pb) < 0)
217 if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {
218 ffio_free_dyn_buf(&pb);
221 extradata_size = avio_close_dyn_buf(pb, &extradata);
225 if (extradata_size >= 4)
226 av_strlcatf(str, size, ".%02x%02x%02x",
227 extradata[1], extradata[2], extradata[3]);
232 static int flush_dynbuf(OutputStream *os, int *range_length)
237 return AVERROR(EINVAL);
241 av_write_frame(os->ctx, NULL);
242 avio_flush(os->ctx->pb);
245 *range_length = avio_close_dyn_buf(os->ctx->pb, &buffer);
247 avio_write(os->out, buffer, *range_length);
251 return avio_open_dyn_buf(&os->ctx->pb);
254 static void set_http_options(AVDictionary **options, DASHContext *c)
257 av_dict_set(options, "user_agent", c->user_agent, 0);
258 if (c->http_persistent)
259 av_dict_set_int(options, "multiple_requests", 1, 0);
262 static void get_hls_playlist_name(char *playlist_name, int string_size,
263 const char *base_url, int id) {
265 snprintf(playlist_name, string_size, "%smedia_%d.m3u8", base_url, id);
267 snprintf(playlist_name, string_size, "media_%d.m3u8", id);
270 static int flush_init_segment(AVFormatContext *s, OutputStream *os)
272 DASHContext *c = s->priv_data;
273 int ret, range_length;
275 ret = flush_dynbuf(os, &range_length);
279 os->pos = os->init_range_length = range_length;
281 ff_format_io_close(s, &os->out);
285 static void dash_free(AVFormatContext *s)
287 DASHContext *c = s->priv_data;
291 for (i = 0; i < c->nb_as; i++)
292 av_dict_free(&c->as[i].metadata);
299 for (i = 0; i < s->nb_streams; i++) {
300 OutputStream *os = &c->streams[i];
301 if (os->ctx && os->ctx_inited)
302 av_write_trailer(os->ctx);
303 if (os->ctx && os->ctx->pb)
304 ffio_free_dyn_buf(&os->ctx->pb);
305 ff_format_io_close(s, &os->out);
307 avformat_free_context(os->ctx);
308 for (j = 0; j < os->nb_segments; j++)
309 av_free(os->segments[j]);
310 av_free(os->segments);
312 av_freep(&c->streams);
314 ff_format_io_close(s, &c->mpd_out);
315 ff_format_io_close(s, &c->m3u8_out);
318 static void output_segment_list(OutputStream *os, AVIOContext *out, AVFormatContext *s,
319 int representation_id, int final)
321 DASHContext *c = s->priv_data;
322 int i, start_index = 0, start_number = 1;
323 if (c->window_size) {
324 start_index = FFMAX(os->nb_segments - c->window_size, 0);
325 start_number = FFMAX(os->segment_index - c->window_size, 1);
328 if (c->use_template) {
329 int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;
330 avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
331 if (!c->use_timeline)
332 avio_printf(out, "duration=\"%"PRId64"\" ", c->last_duration);
333 avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);
334 if (c->use_timeline) {
335 int64_t cur_time = 0;
336 avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
337 for (i = start_index; i < os->nb_segments; ) {
338 Segment *seg = os->segments[i];
340 avio_printf(out, "\t\t\t\t\t\t<S ");
341 if (i == start_index || seg->time != cur_time) {
342 cur_time = seg->time;
343 avio_printf(out, "t=\"%"PRId64"\" ", seg->time);
345 avio_printf(out, "d=\"%d\" ", seg->duration);
346 while (i + repeat + 1 < os->nb_segments &&
347 os->segments[i + repeat + 1]->duration == seg->duration &&
348 os->segments[i + repeat + 1]->time == os->segments[i + repeat]->time + os->segments[i + repeat]->duration)
351 avio_printf(out, "r=\"%d\" ", repeat);
352 avio_printf(out, "/>\n");
354 cur_time += (1 + repeat) * seg->duration;
356 avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");
358 avio_printf(out, "\t\t\t\t</SegmentTemplate>\n");
359 } else if (c->single_file) {
360 avio_printf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", os->initfile);
361 avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
362 avio_printf(out, "\t\t\t\t\t<Initialization range=\"%"PRId64"-%"PRId64"\" />\n", os->init_start_pos, os->init_start_pos + os->init_range_length - 1);
363 for (i = start_index; i < os->nb_segments; i++) {
364 Segment *seg = os->segments[i];
365 avio_printf(out, "\t\t\t\t\t<SegmentURL mediaRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->range_length - 1);
366 if (seg->index_length)
367 avio_printf(out, "indexRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->index_length - 1);
368 avio_printf(out, "/>\n");
370 avio_printf(out, "\t\t\t\t</SegmentList>\n");
372 avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
373 avio_printf(out, "\t\t\t\t\t<Initialization sourceURL=\"%s\" />\n", os->initfile);
374 for (i = start_index; i < os->nb_segments; i++) {
375 Segment *seg = os->segments[i];
376 avio_printf(out, "\t\t\t\t\t<SegmentURL media=\"%s\" />\n", seg->file);
378 avio_printf(out, "\t\t\t\t</SegmentList>\n");
380 if (c->hls_playlist && start_index < os->nb_segments)
382 int timescale = os->ctx->streams[0]->time_base.den;
383 char temp_filename_hls[1024];
384 char filename_hls[1024];
385 AVDictionary *http_opts = NULL;
386 int target_duration = 0;
388 const char *proto = avio_find_protocol_name(c->dirname);
389 int use_rename = proto && !strcmp(proto, "file");
391 get_hls_playlist_name(filename_hls, sizeof(filename_hls),
392 c->dirname, representation_id);
394 snprintf(temp_filename_hls, sizeof(temp_filename_hls), use_rename ? "%s.tmp" : "%s", filename_hls);
396 set_http_options(&http_opts, c);
397 dashenc_io_open(s, &c->m3u8_out, temp_filename_hls, &http_opts);
398 av_dict_free(&http_opts);
399 for (i = start_index; i < os->nb_segments; i++) {
400 Segment *seg = os->segments[i];
401 double duration = (double) seg->duration / timescale;
402 if (target_duration <= duration)
403 target_duration = lrint(duration);
406 ff_hls_write_playlist_header(c->m3u8_out, 6, -1, target_duration,
407 start_number, PLAYLIST_TYPE_NONE);
409 ff_hls_write_init_file(c->m3u8_out, os->initfile, c->single_file,
410 os->init_range_length, os->init_start_pos);
412 for (i = start_index; i < os->nb_segments; i++) {
413 Segment *seg = os->segments[i];
414 ret = ff_hls_write_file_entry(c->m3u8_out, 0, c->single_file,
415 (double) seg->duration / timescale, 0,
416 seg->range_length, seg->start_pos, NULL,
417 c->single_file ? os->initfile : seg->file,
420 av_log(os->ctx, AV_LOG_WARNING, "ff_hls_write_file_entry get error\n");
425 ff_hls_write_end_list(c->m3u8_out);
427 dashenc_io_close(s, &c->m3u8_out, temp_filename_hls);
430 if (avpriv_io_move(temp_filename_hls, filename_hls) < 0) {
431 av_log(os->ctx, AV_LOG_WARNING, "renaming file %s to %s failed\n\n", temp_filename_hls, filename_hls);
437 static char *xmlescape(const char *str) {
438 int outlen = strlen(str)*3/2 + 6;
439 char *out = av_realloc(NULL, outlen + 1);
443 for (; *str; str++) {
444 if (pos + 6 > outlen) {
446 outlen = 2 * outlen + 6;
447 tmp = av_realloc(out, outlen + 1);
455 memcpy(&out[pos], "&", 5);
457 } else if (*str == '<') {
458 memcpy(&out[pos], "<", 4);
460 } else if (*str == '>') {
461 memcpy(&out[pos], ">", 4);
463 } else if (*str == '\'') {
464 memcpy(&out[pos], "'", 6);
466 } else if (*str == '\"') {
467 memcpy(&out[pos], """, 6);
477 static void write_time(AVIOContext *out, int64_t time)
479 int seconds = time / AV_TIME_BASE;
480 int fractions = time % AV_TIME_BASE;
481 int minutes = seconds / 60;
482 int hours = minutes / 60;
485 avio_printf(out, "PT");
487 avio_printf(out, "%dH", hours);
488 if (hours || minutes)
489 avio_printf(out, "%dM", minutes);
490 avio_printf(out, "%d.%dS", seconds, fractions / (AV_TIME_BASE / 10));
493 static void format_date_now(char *buf, int size)
495 time_t t = time(NULL);
496 struct tm *ptm, tmbuf;
497 ptm = gmtime_r(&t, &tmbuf);
499 if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%SZ", ptm))
504 static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_index,
507 DASHContext *c = s->priv_data;
508 AdaptationSet *as = &c->as[as_index];
509 AVDictionaryEntry *lang, *role;
512 avio_printf(out, "\t\t<AdaptationSet id=\"%s\" contentType=\"%s\" segmentAlignment=\"true\" bitstreamSwitching=\"true\"",
513 as->id, as->media_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
514 if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate && av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0)
515 avio_printf(out, " maxFrameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
516 lang = av_dict_get(as->metadata, "language", NULL, 0);
518 avio_printf(out, " lang=\"%s\"", lang->value);
519 avio_printf(out, ">\n");
521 role = av_dict_get(as->metadata, "role", NULL, 0);
523 avio_printf(out, "\t\t\t<Role schemeIdUri=\"urn:mpeg:dash:role:2011\" value=\"%s\"/>\n", role->value);
525 for (i = 0; i < s->nb_streams; i++) {
526 OutputStream *os = &c->streams[i];
528 if (os->as_idx - 1 != as_index)
531 if (as->media_type == AVMEDIA_TYPE_VIDEO) {
532 AVStream *st = s->streams[i];
533 avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/%s\" codecs=\"%s\"%s width=\"%d\" height=\"%d\"",
534 i, os->format_name, os->codec_str, os->bandwidth_str, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height);
535 if (st->avg_frame_rate.num)
536 avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den);
537 avio_printf(out, ">\n");
539 avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/%s\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n",
540 i, os->format_name, os->codec_str, os->bandwidth_str, s->streams[i]->codecpar->sample_rate);
541 avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n",
542 s->streams[i]->codecpar->channels);
544 output_segment_list(os, out, s, i, final);
545 avio_printf(out, "\t\t\t</Representation>\n");
547 avio_printf(out, "\t\t</AdaptationSet>\n");
552 static int add_adaptation_set(AVFormatContext *s, AdaptationSet **as, enum AVMediaType type)
554 DASHContext *c = s->priv_data;
556 void *mem = av_realloc(c->as, sizeof(*c->as) * (c->nb_as + 1));
558 return AVERROR(ENOMEM);
562 *as = &c->as[c->nb_as - 1];
563 memset(*as, 0, sizeof(**as));
564 (*as)->media_type = type;
569 static int adaptation_set_add_stream(AVFormatContext *s, int as_idx, int i)
571 DASHContext *c = s->priv_data;
572 AdaptationSet *as = &c->as[as_idx - 1];
573 OutputStream *os = &c->streams[i];
575 if (as->media_type != s->streams[i]->codecpar->codec_type) {
576 av_log(s, AV_LOG_ERROR, "Codec type of stream %d doesn't match AdaptationSet's media type\n", i);
577 return AVERROR(EINVAL);
578 } else if (os->as_idx) {
579 av_log(s, AV_LOG_ERROR, "Stream %d is already assigned to an AdaptationSet\n", i);
580 return AVERROR(EINVAL);
587 static int parse_adaptation_sets(AVFormatContext *s)
589 DASHContext *c = s->priv_data;
590 const char *p = c->adaptation_sets;
591 enum { new_set, parse_id, parsing_streams } state;
595 // default: one AdaptationSet for each stream
597 for (i = 0; i < s->nb_streams; i++) {
598 if ((ret = add_adaptation_set(s, &as, s->streams[i]->codecpar->codec_type)) < 0)
600 snprintf(as->id, sizeof(as->id), "%d", i);
602 c->streams[i].as_idx = c->nb_as;
607 // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
613 } else if (state == new_set && av_strstart(p, "id=", &p)) {
615 if ((ret = add_adaptation_set(s, &as, AVMEDIA_TYPE_UNKNOWN)) < 0)
619 snprintf(as->id, sizeof(as->id), "%.*s", n, p);
625 } else if (state == parse_id && av_strstart(p, "streams=", &p)) {
626 state = parsing_streams;
627 } else if (state == parsing_streams) {
628 AdaptationSet *as = &c->as[c->nb_as - 1];
629 char idx_str[8], *end_str;
631 n = strcspn(p, " ,");
632 snprintf(idx_str, sizeof(idx_str), "%.*s", n, p);
635 // if value is "a" or "v", map all streams of that type
636 if (as->media_type == AVMEDIA_TYPE_UNKNOWN && (idx_str[0] == 'v' || idx_str[0] == 'a')) {
637 enum AVMediaType type = (idx_str[0] == 'v') ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
638 av_log(s, AV_LOG_DEBUG, "Map all streams of type %s\n", idx_str);
640 for (i = 0; i < s->nb_streams; i++) {
641 if (s->streams[i]->codecpar->codec_type != type)
644 as->media_type = s->streams[i]->codecpar->codec_type;
646 if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
649 } else { // select single stream
650 i = strtol(idx_str, &end_str, 10);
651 if (idx_str == end_str || i < 0 || i >= s->nb_streams) {
652 av_log(s, AV_LOG_ERROR, "Selected stream \"%s\" not found!\n", idx_str);
653 return AVERROR(EINVAL);
655 av_log(s, AV_LOG_DEBUG, "Map stream %d\n", i);
657 if (as->media_type == AVMEDIA_TYPE_UNKNOWN) {
658 as->media_type = s->streams[i]->codecpar->codec_type;
661 if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
670 return AVERROR(EINVAL);
675 // check for unassigned streams
676 for (i = 0; i < s->nb_streams; i++) {
677 OutputStream *os = &c->streams[i];
679 av_log(s, AV_LOG_ERROR, "Stream %d is not mapped to an AdaptationSet\n", i);
680 return AVERROR(EINVAL);
686 static int write_manifest(AVFormatContext *s, int final)
688 DASHContext *c = s->priv_data;
690 char temp_filename[1024];
692 const char *proto = avio_find_protocol_name(s->filename);
693 int use_rename = proto && !strcmp(proto, "file");
694 static unsigned int warned_non_file = 0;
695 AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);
696 AVDictionary *opts = NULL;
698 if (!use_rename && !warned_non_file++)
699 av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
701 snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->filename);
702 set_http_options(&opts, c);
703 ret = dashenc_io_open(s, &c->mpd_out, temp_filename, &opts);
705 av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
710 avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
711 avio_printf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
712 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
713 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
714 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
715 "\tprofiles=\"urn:mpeg:dash:profile:isoff-live:2011\"\n"
716 "\ttype=\"%s\"\n", final ? "static" : "dynamic");
718 avio_printf(out, "\tmediaPresentationDuration=\"");
719 write_time(out, c->total_duration);
720 avio_printf(out, "\"\n");
722 int64_t update_period = c->last_duration / AV_TIME_BASE;
724 if (c->use_template && !c->use_timeline)
726 avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period);
727 avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE);
728 if (!c->availability_start_time[0] && s->nb_streams > 0 && c->streams[0].nb_segments > 0) {
729 format_date_now(c->availability_start_time, sizeof(c->availability_start_time));
731 if (c->availability_start_time[0])
732 avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);
733 format_date_now(now_str, sizeof(now_str));
735 avio_printf(out, "\tpublishTime=\"%s\"\n", now_str);
736 if (c->window_size && c->use_template) {
737 avio_printf(out, "\ttimeShiftBufferDepth=\"");
738 write_time(out, c->last_duration * c->window_size);
739 avio_printf(out, "\"\n");
742 avio_printf(out, "\tminBufferTime=\"");
743 write_time(out, c->last_duration * 2);
744 avio_printf(out, "\">\n");
745 avio_printf(out, "\t<ProgramInformation>\n");
747 char *escaped = xmlescape(title->value);
748 avio_printf(out, "\t\t<Title>%s</Title>\n", escaped);
751 avio_printf(out, "\t</ProgramInformation>\n");
753 if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {
754 OutputStream *os = &c->streams[0];
755 int start_index = FFMAX(os->nb_segments - c->window_size, 0);
756 int64_t start_time = av_rescale_q(os->segments[start_index]->time, s->streams[0]->time_base, AV_TIME_BASE_Q);
757 avio_printf(out, "\t<Period id=\"0\" start=\"");
758 write_time(out, start_time);
759 avio_printf(out, "\">\n");
761 avio_printf(out, "\t<Period id=\"0\" start=\"PT0.0S\">\n");
764 for (i = 0; i < c->nb_as; i++) {
765 if ((ret = write_adaptation_set(s, out, i, final)) < 0)
768 avio_printf(out, "\t</Period>\n");
770 if (c->utc_timing_url)
771 avio_printf(out, "\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
773 avio_printf(out, "</MPD>\n");
775 dashenc_io_close(s, &c->mpd_out, temp_filename);
778 if ((ret = avpriv_io_move(temp_filename, s->filename)) < 0)
782 if (c->hls_playlist && !c->master_playlist_created) {
783 char filename_hls[1024];
784 const char *audio_group = "A1";
786 int max_audio_bitrate = 0;
789 snprintf(filename_hls, sizeof(filename_hls), "%s/master.m3u8", c->dirname);
791 snprintf(filename_hls, sizeof(filename_hls), "master.m3u8");
793 snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", filename_hls);
795 set_http_options(&opts, c);
796 ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, NULL, &opts);
798 av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
803 ff_hls_write_playlist_version(out, 6);
805 for (i = 0; i < s->nb_streams; i++) {
806 char playlist_file[64];
807 AVStream *st = s->streams[i];
808 if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
810 get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
811 ff_hls_write_audio_rendition(out, (char *)audio_group,
812 playlist_file, i, is_default);
813 max_audio_bitrate = FFMAX(st->codecpar->bit_rate, max_audio_bitrate);
817 for (i = 0; i < s->nb_streams; i++) {
818 char playlist_file[64];
819 AVStream *st = s->streams[i];
821 int stream_bitrate = st->codecpar->bit_rate;
822 if ((st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) && max_audio_bitrate) {
823 agroup = (char *)audio_group;
824 stream_bitrate += max_audio_bitrate;
826 get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
827 ff_hls_write_stream_info(st, out, stream_bitrate, playlist_file, agroup, NULL, NULL);
831 if ((ret = avpriv_io_move(temp_filename, filename_hls)) < 0)
833 c->master_playlist_created = 1;
839 static int dict_copy_entry(AVDictionary **dst, const AVDictionary *src, const char *key)
841 AVDictionaryEntry *entry = av_dict_get(src, key, NULL, 0);
843 av_dict_set(dst, key, entry->value, AV_DICT_DONT_OVERWRITE);
847 static int dash_init(AVFormatContext *s)
849 DASHContext *c = s->priv_data;
854 if (c->single_file_name)
859 av_strlcpy(c->dirname, s->filename, sizeof(c->dirname));
860 ptr = strrchr(c->dirname, '/');
862 av_strlcpy(basename, &ptr[1], sizeof(basename));
865 c->dirname[0] = '\0';
866 av_strlcpy(basename, s->filename, sizeof(basename));
869 ptr = strrchr(basename, '.');
873 c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
875 return AVERROR(ENOMEM);
877 if ((ret = parse_adaptation_sets(s)) < 0)
880 for (i = 0; i < s->nb_streams; i++) {
881 OutputStream *os = &c->streams[i];
882 AdaptationSet *as = &c->as[os->as_idx - 1];
883 AVFormatContext *ctx;
885 AVDictionary *opts = NULL;
888 os->bit_rate = s->streams[i]->codecpar->bit_rate;
890 snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
891 " bandwidth=\"%d\"", os->bit_rate);
893 int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?
894 AV_LOG_ERROR : AV_LOG_WARNING;
895 av_log(s, level, "No bit rate set for stream %d\n", i);
896 if (s->strict_std_compliance >= FF_COMPLIANCE_STRICT)
897 return AVERROR(EINVAL);
900 // copy AdaptationSet language and role from stream metadata
901 dict_copy_entry(&as->metadata, s->streams[i]->metadata, "language");
902 dict_copy_entry(&as->metadata, s->streams[i]->metadata, "role");
904 ctx = avformat_alloc_context();
906 return AVERROR(ENOMEM);
908 // choose muxer based on codec: webm for VP8/9 and opus, mp4 otherwise
909 // note: os->format_name is also used as part of the mimetype of the
910 // representation, e.g. video/<format_name>
911 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VP8 ||
912 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VP9 ||
913 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
914 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VORBIS) {
915 snprintf(os->format_name, sizeof(os->format_name), "webm");
917 snprintf(os->format_name, sizeof(os->format_name), "mp4");
919 ctx->oformat = av_guess_format(os->format_name, NULL, NULL);
921 return AVERROR_MUXER_NOT_FOUND;
923 ctx->interrupt_callback = s->interrupt_callback;
924 ctx->opaque = s->opaque;
925 ctx->io_close = s->io_close;
926 ctx->io_open = s->io_open;
928 if (!(st = avformat_new_stream(ctx, NULL)))
929 return AVERROR(ENOMEM);
930 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
931 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
932 st->time_base = s->streams[i]->time_base;
933 st->avg_frame_rate = s->streams[i]->avg_frame_rate;
934 ctx->avoid_negative_ts = s->avoid_negative_ts;
935 ctx->flags = s->flags;
937 if ((ret = avio_open_dyn_buf(&ctx->pb)) < 0)
940 if (c->single_file) {
941 if (c->single_file_name)
942 ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->single_file_name, i, 0, os->bit_rate, 0);
944 snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);
946 ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->init_seg_name, i, 0, os->bit_rate, 0);
948 snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
949 set_http_options(&opts, c);
950 ret = s->io_open(s, &os->out, filename, AVIO_FLAG_WRITE, &opts);
954 os->init_start_pos = 0;
956 if (!strcmp(os->format_name, "mp4")) {
957 av_dict_set(&opts, "movflags", "frag_custom+dash+delay_moov", 0);
959 av_dict_set_int(&opts, "cluster_time_limit", c->min_seg_duration / 1000, 0);
960 av_dict_set_int(&opts, "cluster_size_limit", 5 * 1024 * 1024, 0); // set a large cluster size limit
961 av_dict_set_int(&opts, "dash", 1, 0);
962 av_dict_set_int(&opts, "dash_track_number", i + 1, 0);
963 av_dict_set_int(&opts, "live", 1, 0);
965 if ((ret = avformat_init_output(ctx, &opts)) < 0)
971 av_log(s, AV_LOG_VERBOSE, "Representation %d init segment will be written to: %s\n", i, filename);
973 // Flush init segment
974 // except for mp4, since delay_moov is set and the init segment
975 // is then flushed after the first packets
976 if (strcmp(os->format_name, "mp4")) {
977 flush_init_segment(s, os);
980 s->streams[i]->time_base = st->time_base;
981 // If the muxer wants to shift timestamps, request to have them shifted
982 // already before being handed to this muxer, so we don't have mismatches
983 // between the MPD and the actual segments.
984 s->avoid_negative_ts = ctx->avoid_negative_ts;
985 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
986 AVRational avg_frame_rate = s->streams[i]->avg_frame_rate;
987 if (avg_frame_rate.num > 0) {
988 if (av_cmp_q(avg_frame_rate, as->min_frame_rate) < 0)
989 as->min_frame_rate = avg_frame_rate;
990 if (av_cmp_q(as->max_frame_rate, avg_frame_rate) < 0)
991 as->max_frame_rate = avg_frame_rate;
993 as->ambiguous_frame_rate = 1;
998 set_codec_str(s, st->codecpar, os->codec_str, sizeof(os->codec_str));
999 os->first_pts = AV_NOPTS_VALUE;
1000 os->max_pts = AV_NOPTS_VALUE;
1001 os->last_dts = AV_NOPTS_VALUE;
1002 os->segment_index = 1;
1005 if (!c->has_video && c->min_seg_duration <= 0) {
1006 av_log(s, AV_LOG_WARNING, "no video stream and no min seg duration set\n");
1007 return AVERROR(EINVAL);
1012 static int dash_write_header(AVFormatContext *s)
1014 DASHContext *c = s->priv_data;
1016 for (i = 0; i < s->nb_streams; i++) {
1017 OutputStream *os = &c->streams[i];
1018 if ((ret = avformat_write_header(os->ctx, NULL)) < 0) {
1023 ret = write_manifest(s, 0);
1025 av_log(s, AV_LOG_VERBOSE, "Manifest written to: %s\n", s->filename);
1029 static int add_segment(OutputStream *os, const char *file,
1030 int64_t time, int duration,
1031 int64_t start_pos, int64_t range_length,
1032 int64_t index_length)
1036 if (os->nb_segments >= os->segments_size) {
1037 os->segments_size = (os->segments_size + 1) * 2;
1038 if ((err = av_reallocp(&os->segments, sizeof(*os->segments) *
1039 os->segments_size)) < 0) {
1040 os->segments_size = 0;
1041 os->nb_segments = 0;
1045 seg = av_mallocz(sizeof(*seg));
1047 return AVERROR(ENOMEM);
1048 av_strlcpy(seg->file, file, sizeof(seg->file));
1050 seg->duration = duration;
1051 if (seg->time < 0) { // If pts<0, it is expected to be cut away with an edit list
1052 seg->duration += seg->time;
1055 seg->start_pos = start_pos;
1056 seg->range_length = range_length;
1057 seg->index_length = index_length;
1058 os->segments[os->nb_segments++] = seg;
1059 os->segment_index++;
1063 static void write_styp(AVIOContext *pb)
1066 ffio_wfourcc(pb, "styp");
1067 ffio_wfourcc(pb, "msdh");
1068 avio_wb32(pb, 0); /* minor */
1069 ffio_wfourcc(pb, "msdh");
1070 ffio_wfourcc(pb, "msix");
1073 static void find_index_range(AVFormatContext *s, const char *full_path,
1074 int64_t pos, int *index_length)
1080 ret = s->io_open(s, &pb, full_path, AVIO_FLAG_READ, NULL);
1083 if (avio_seek(pb, pos, SEEK_SET) != pos) {
1084 ff_format_io_close(s, &pb);
1087 ret = avio_read(pb, buf, 8);
1088 ff_format_io_close(s, &pb);
1091 if (AV_RL32(&buf[4]) != MKTAG('s', 'i', 'd', 'x'))
1093 *index_length = AV_RB32(&buf[0]);
1096 static int update_stream_extradata(AVFormatContext *s, OutputStream *os,
1097 AVCodecParameters *par)
1101 if (os->ctx->streams[0]->codecpar->extradata_size || !par->extradata_size)
1104 extradata = av_malloc(par->extradata_size);
1107 return AVERROR(ENOMEM);
1109 memcpy(extradata, par->extradata, par->extradata_size);
1111 os->ctx->streams[0]->codecpar->extradata = extradata;
1112 os->ctx->streams[0]->codecpar->extradata_size = par->extradata_size;
1114 set_codec_str(s, par, os->codec_str, sizeof(os->codec_str));
1119 static int dash_flush(AVFormatContext *s, int final, int stream)
1121 DASHContext *c = s->priv_data;
1124 const char *proto = avio_find_protocol_name(s->filename);
1125 int use_rename = proto && !strcmp(proto, "file");
1127 int cur_flush_segment_index = 0;
1129 cur_flush_segment_index = c->streams[stream].segment_index;
1131 for (i = 0; i < s->nb_streams; i++) {
1132 OutputStream *os = &c->streams[i];
1133 AVStream *st = s->streams[i];
1134 char filename[1024] = "", full_path[1024], temp_path[1024];
1135 int range_length, index_length = 0;
1137 if (!os->packets_written)
1140 // Flush the single stream that got a keyframe right now.
1141 // Flush all audio streams as well, in sync with video keyframes,
1142 // but not the other video streams.
1143 if (stream >= 0 && i != stream) {
1144 if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
1146 // Make sure we don't flush audio streams multiple times, when
1147 // all video streams are flushed one at a time.
1148 if (c->has_video && os->segment_index > cur_flush_segment_index)
1152 if (!os->init_range_length) {
1153 flush_init_segment(s, os);
1156 if (!c->single_file) {
1157 AVDictionary *opts = NULL;
1158 ff_dash_fill_tmpl_params(filename, sizeof(filename), c->media_seg_name, i, os->segment_index, os->bit_rate, os->start_pts);
1159 snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, filename);
1160 snprintf(temp_path, sizeof(temp_path), use_rename ? "%s.tmp" : "%s", full_path);
1161 set_http_options(&opts, c);
1162 ret = dashenc_io_open(s, &os->out, temp_path, &opts);
1165 av_dict_free(&opts);
1166 if (!strcmp(os->format_name, "mp4"))
1167 write_styp(os->ctx->pb);
1169 snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, os->initfile);
1172 ret = flush_dynbuf(os, &range_length);
1175 os->packets_written = 0;
1177 if (c->single_file) {
1178 find_index_range(s, full_path, os->pos, &index_length);
1180 dashenc_io_close(s, &os->out, temp_path);
1183 ret = avpriv_io_move(temp_path, full_path);
1189 if (!os->bit_rate) {
1190 // calculate average bitrate of first segment
1191 int64_t bitrate = (int64_t) range_length * 8 * AV_TIME_BASE / av_rescale_q(os->max_pts - os->start_pts,
1195 os->bit_rate = bitrate;
1196 snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
1197 " bandwidth=\"%d\"", os->bit_rate);
1200 add_segment(os, filename, os->start_pts, os->max_pts - os->start_pts, os->pos, range_length, index_length);
1201 av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, full_path);
1203 os->pos += range_length;
1206 if (c->window_size || (final && c->remove_at_exit)) {
1207 for (i = 0; i < s->nb_streams; i++) {
1208 OutputStream *os = &c->streams[i];
1210 int remove = os->nb_segments - c->window_size - c->extra_window_size;
1211 if (final && c->remove_at_exit)
1212 remove = os->nb_segments;
1214 for (j = 0; j < remove; j++) {
1215 char filename[1024];
1216 snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->segments[j]->file);
1218 av_free(os->segments[j]);
1220 os->nb_segments -= remove;
1221 memmove(os->segments, os->segments + remove, os->nb_segments * sizeof(*os->segments));
1227 ret = write_manifest(s, final);
1231 static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
1233 DASHContext *c = s->priv_data;
1234 AVStream *st = s->streams[pkt->stream_index];
1235 OutputStream *os = &c->streams[pkt->stream_index];
1238 ret = update_stream_extradata(s, os, st->codecpar);
1242 // Fill in a heuristic guess of the packet duration, if none is available.
1243 // The mp4 muxer will do something similar (for the last packet in a fragment)
1244 // if nothing is set (setting it for the other packets doesn't hurt).
1245 // By setting a nonzero duration here, we can be sure that the mp4 muxer won't
1246 // invoke its heuristic (this doesn't have to be identical to that algorithm),
1247 // so that we know the exact timestamps of fragments.
1248 if (!pkt->duration && os->last_dts != AV_NOPTS_VALUE)
1249 pkt->duration = pkt->dts - os->last_dts;
1250 os->last_dts = pkt->dts;
1252 // If forcing the stream to start at 0, the mp4 muxer will set the start
1253 // timestamps to 0. Do the same here, to avoid mismatches in duration/timestamps.
1254 if (os->first_pts == AV_NOPTS_VALUE &&
1255 s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO) {
1256 pkt->pts -= pkt->dts;
1260 if (os->first_pts == AV_NOPTS_VALUE)
1261 os->first_pts = pkt->pts;
1263 if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
1264 pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
1265 av_compare_ts(pkt->pts - os->start_pts, st->time_base,
1266 c->min_seg_duration, AV_TIME_BASE_Q) >= 0) {
1267 int64_t prev_duration = c->last_duration;
1269 c->last_duration = av_rescale_q(pkt->pts - os->start_pts,
1272 c->total_duration = av_rescale_q(pkt->pts - os->first_pts,
1276 if ((!c->use_timeline || !c->use_template) && prev_duration) {
1277 if (c->last_duration < prev_duration*9/10 ||
1278 c->last_duration > prev_duration*11/10) {
1279 av_log(s, AV_LOG_WARNING,
1280 "Segment durations differ too much, enable use_timeline "
1281 "and use_template, or keep a stricter keyframe interval\n");
1285 if ((ret = dash_flush(s, 0, pkt->stream_index)) < 0)
1289 if (!os->packets_written) {
1290 // If we wrote a previous segment, adjust the start time of the segment
1291 // to the end of the previous one (which is the same as the mp4 muxer
1292 // does). This avoids gaps in the timeline.
1293 if (os->max_pts != AV_NOPTS_VALUE)
1294 os->start_pts = os->max_pts;
1296 os->start_pts = pkt->pts;
1298 if (os->max_pts == AV_NOPTS_VALUE)
1299 os->max_pts = pkt->pts + pkt->duration;
1301 os->max_pts = FFMAX(os->max_pts, pkt->pts + pkt->duration);
1302 os->packets_written++;
1303 return ff_write_chained(os->ctx, 0, pkt, s, 0);
1306 static int dash_write_trailer(AVFormatContext *s)
1308 DASHContext *c = s->priv_data;
1310 if (s->nb_streams > 0) {
1311 OutputStream *os = &c->streams[0];
1312 // If no segments have been written so far, try to do a crude
1313 // guess of the segment duration
1314 if (!c->last_duration)
1315 c->last_duration = av_rescale_q(os->max_pts - os->start_pts,
1316 s->streams[0]->time_base,
1318 c->total_duration = av_rescale_q(os->max_pts - os->first_pts,
1319 s->streams[0]->time_base,
1322 dash_flush(s, 1, -1);
1324 if (c->remove_at_exit) {
1325 char filename[1024];
1327 for (i = 0; i < s->nb_streams; i++) {
1328 OutputStream *os = &c->streams[i];
1329 snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
1332 unlink(s->filename);
1338 static int dash_check_bitstream(struct AVFormatContext *s, const AVPacket *avpkt)
1340 DASHContext *c = s->priv_data;
1341 OutputStream *os = &c->streams[avpkt->stream_index];
1342 AVFormatContext *oc = os->ctx;
1343 if (oc->oformat->check_bitstream) {
1345 AVPacket pkt = *avpkt;
1346 pkt.stream_index = 0;
1347 ret = oc->oformat->check_bitstream(oc, &pkt);
1349 AVStream *st = s->streams[avpkt->stream_index];
1350 AVStream *ost = oc->streams[0];
1351 st->internal->bsfcs = ost->internal->bsfcs;
1352 st->internal->nb_bsfcs = ost->internal->nb_bsfcs;
1353 ost->internal->bsfcs = NULL;
1354 ost->internal->nb_bsfcs = 0;
1361 #define OFFSET(x) offsetof(DASHContext, x)
1362 #define E AV_OPT_FLAG_ENCODING_PARAM
1363 static const AVOption options[] = {
1364 { "adaptation_sets", "Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on", OFFSET(adaptation_sets), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
1365 { "window_size", "number of segments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
1366 { "extra_window_size", "number of segments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E },
1367 { "min_seg_duration", "minimum segment duration (in microseconds)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT, { .i64 = 5000000 }, 0, INT_MAX, E },
1368 { "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1369 { "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
1370 { "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
1371 { "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1372 { "single_file_name", "DASH-templated name to be used for baseURL. Implies storing all segments in one file, accessed using byte ranges", OFFSET(single_file_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
1373 { "init_seg_name", "DASH-templated name to used for the initialization segment", OFFSET(init_seg_name), AV_OPT_TYPE_STRING, {.str = "init-stream$RepresentationID$.m4s"}, 0, 0, E },
1374 { "media_seg_name", "DASH-templated name to used for the media segments", OFFSET(media_seg_name), AV_OPT_TYPE_STRING, {.str = "chunk-stream$RepresentationID$-$Number%05d$.m4s"}, 0, 0, E },
1375 { "utc_timing_url", "URL of the page that will return the UTC timestamp in ISO format", OFFSET(utc_timing_url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
1376 { "http_user_agent", "override User-Agent field in HTTP header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
1377 { "http_persistent", "Use persistent HTTP connections", OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1378 { "hls_playlist", "Generate HLS playlist files(master.m3u8, media_%d.m3u8)", OFFSET(hls_playlist), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
1382 static const AVClass dash_class = {
1383 .class_name = "dash muxer",
1384 .item_name = av_default_item_name,
1386 .version = LIBAVUTIL_VERSION_INT,
1389 AVOutputFormat ff_dash_muxer = {
1391 .long_name = NULL_IF_CONFIG_SMALL("DASH Muxer"),
1392 .extensions = "mpd",
1393 .priv_data_size = sizeof(DASHContext),
1394 .audio_codec = AV_CODEC_ID_AAC,
1395 .video_codec = AV_CODEC_ID_H264,
1396 .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE | AVFMT_TS_NEGATIVE,
1398 .write_header = dash_write_header,
1399 .write_packet = dash_write_packet,
1400 .write_trailer = dash_write_trailer,
1401 .deinit = dash_free,
1402 .check_bitstream = dash_check_bitstream,
1403 .priv_class = &dash_class,